WO2009103243A1 - 流感病毒聚合酶pac-pb1n复合体的晶体结构及其应用 - Google Patents
流感病毒聚合酶pac-pb1n复合体的晶体结构及其应用 Download PDFInfo
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Definitions
- the present invention relates to the expression, purification, crystallization of influenza virus PA and PB 1 polypeptides in bacteria, and the three-dimensional crystal structure of PA carboxyl end and PB1 amino terminal polypeptide and its application in drug design. .
- Influenza viruses have caused major disasters to humans (Taubenberger and Morens 2007). Because there are not many coping measures and the constant variability of the virus itself, the threat of this virus to humans has always existed. The severe bird flu epidemic that has occurred frequently in the world in recent years and the emergence of cases of avian flu transmission in humans pose a major threat to human health and human economic activities. Studying this type of virus is of great significance for the protection of human health.
- Avian influenza is a type A influenza virus and they are members of the Orthomyxoviridae family. Its viral genome consists of eight negatively charged single-stranded RNAs. By comparing the genes derived from avian influenza with other influenza A viruses, they have scattered mutations in the primary structure. These mutations cause different pathogenicity of different influenza viruses. It is currently believed that influenza viruses can encode 11 proteins. The replication of the influenza virus genomic RNA and mRNA transcription are all carried out by the RNA polymerase carried by the virus itself, and therefore, this polymerase becomes a potentially important drug target. Recent studies have shown that the high pathogenicity of some influenza viruses is directly related to polymerase mutations (Hulse-Post, Franks et al.
- RNA polymerase is a complex composed of three subunits of PB 1, PB2 and PA. Among them, PB 1 is a catalytically active subunit, and PB2 is responsible for obtaining the mRNA cap of the fine moon pack (CAP structure;) by a Snatching method, as a primer for viral mRNA transcription, but in this process, PB 1 is an endonuclease. .
- the polymerase has the activity of three kinds of RNA required for the synthesis of viruses, namely mRNA, cRNA (replication intermediate) and vRNA.
- mRNA synthesis starts with a capped oligonucleotide primer, terminating at 15 to 17 nucleotides from the end of the 3 macroRNA, and adding a polyadenosine tail.
- the polymerase can completely synthesize viral full-length cRNA intermediates and then synthesize full-length vRNAs.
- the insect sessule expression system can express each subunit of the polymerase, so that three different complexes can be formed, one is a ternary complex containing three subunits of polymerase PB1/PB2/PA, and two binary Complex, separate It is a PB 1/PB2, PB 1/PA binary complex, but cannot form a PB2/PA complex (Honda, Mizumoto et al. 2002).
- 25 amino acids at the N-terminus of PB 1 are sufficient to interact with the C-terminus of PA, and the C-terminus of PB1 is responsible for interaction with the N-terminus of PB2.
- a synthetic PB 1 N-terminal competitive small peptide can significantly inhibit viral polymerase activity.
- RNA synthesis experiments using dinucleotide ApG as a primer showed that the PB 1/PA complex can efficiently initiate replication of viral genomic RNA, while PB1/PB2 can perform viral mRNA synthesis in vitro (Honda, Mizumoto et al. 2002).
- Deng et al. (2006) used 293 cells to express purified recombinant polymerase results, but showed that three subunits are required for both replication and transcription (Deng, Sharps et al. 2006).
- the main involvement of PA in the replication of viral RNA stems from the discovery that a temperature-sensitive mutant (L226P) causes genomic replication at the non-permissive temperature without affecting transcriptional activity (Kawaguchi, Naito et al.
- PA was found to have a protease activity similar to chymotrypsin, Sanz-Ezquerro et al. (1996) found that about 250 amino acids at the N-terminus are the protease's live region (Sanz-Ezquerro, Zurcher et al. 1996).
- the effect of protease activity of PA on the function of polymerase is still controversial. Hara et al.
- the present invention provides a method for separately cloning and expressing a wild-type or mutant protein of an influenza virus polymerase complex subunit PA into an amino terminus and a carboxy terminus, and separately expressing, purifying, and crystallizing the amino terminus of the PA.
- the PA used in the present invention is a 256 amino acid in front of the aryl group and a fragment containing 257 to 716 amino acid residues at the carboxy terminus and a PB1 amino terminal 25 peptide complex in the large intestine.
- the present invention provides a method for dividing and expressing a wild-type or mutant protein of influenza virus polymerase subunit PA into an amino terminus and a carboxy terminus, and providing a PA-terminal end for expression purification and crystallization. And co-purifying the PA carboxy terminus and the PB 1 amino terminus short peptide complex for protein crystallization by expressing the amino terminal polypeptide of the wild type or mutant protein of another subunit PB 1 of influenza virus polymerase.
- the present invention uses a prokaryotic expression system of E. coli (but does not exclude other expression systems, such as expression in other bacteria or other eukaryotic cells).
- the fusion protein is expressed in a manner, and two expression bacteria expressing the carboxy terminal of the PA and the short peptide of the PB 1 amino terminal are mixed, and the protein containing the carboxy terminal of the PA and the short peptide of the PB1 terminal as described above is further purified from the bacteria.
- Complex a method for protein crystallization.
- the present invention relates to expression of E. coli in which the 256-position amino acid of the influenza virus polymerase subunit PA protein base and the carboxy terminal 257th to 716th amino acid polypeptide are obtained, and the influenza is expressed in Escherichia coli.
- the present invention provides a process for purifying the carboxy terminus of PA (PA C) method with 1 N terminal PB peptide complex, the method comprising: expressing influenza virus PA bully proximal end 257 to the atmosphere of 716 amino acid
- the flora and the flora expressing the short peptides of 25 or 48 amino acids of the influenza virus PB1 were suspended in buffer, and then the two expression bacteria were mixed in proportion to make GST-PAc and GST-PB a total protein content of 1 N reaches a certain molar ratio, thereby expressing a mixed protein of the two proteins; purifying the mixed protein by affinity column method; then digesting the GST fusion protein with PreScission protease; further using The PA and PB 1 N-terminal peptide complexes were separated and purified by gel filtration and ion exchange chromatography; the purity of the protein was determined by gel electrophoresis.
- the present invention provides a method of crystallizing the PA C and PB 1 N- terminal peptide complex obtained above, the method comprising: concentrating the PA C and PB 1 N- terminal peptide complex to 5 -30 mg/ml; crystal growth conditions were screened by vapor suspension method at 4 -30 ° C; crystals of the protein complex were obtained.
- the invention provides crystals of PA C and PB 1 N- terminal peptide complexes.
- the present invention provides a three-dimensional structure of a crystal of PA C and a PB 1 N- terminal peptide complex, which describes a mode of interaction between PA C and PB 1 N and corresponding interaction sites, and a PA in the complex Secondary structure of the C and PB 1 N polypeptide proteins, peptide chain orientation, and three-dimensional molecular structure.
- crystal diffraction data obtained protein crystals PA C and PB1 N-terminal peptide complex, into the diffraction data of the crystals of these proteins
- the three-dimensional structure model of PA C and PB 1 N- terminal peptide complex was constructed by structural analysis process.
- a three-dimensional crystal structure of a complex of a carboxy terminal PAc of an influenza virus polymerase subunit PA and an amino terminal PB 1 N of PB 1 wherein the influenza virus polymerase subunit PA
- the carboxy terminal PA C is an amino acid of from about 201 to about 301 amino acids to about 650 ⁇ end of the influenza virus polymerase subunit PA
- the aryl end of the PB 1 is PB 1 N a short peptide within 48 amino acids of the amino terminal PB 1 N of the viral polymerase subunit PB 1
- the atom in the three-dimensional structure of the crystal has at least a portion of the atomic coordinates listed in Table 1, or any relationship thereto
- the average root mean square deviation (RMSD) of the three-dimensional coordinates of the main chain carbon skeleton atom of at least 40% of the amino acid residues is less than or equal to 1.7 angstroms.
- the base end of the viral polymerase subunit PA is PA C and
- the influenza virus strain is selected from the group consisting of a sputum type, a type B or a type C influenza virus.
- the influenza A virus strain A/goose/Guangdong/1/96, A/Brevig Mission/1/1918; influenza B virus strain: B/Ann Arbor/1/1966 or influenza C virus strain: C /JJ/1950.
- the polymerase subunit PA wherein said influenza virus type A carboxy terminal PA PA C of the influenza virus polymerase deceive the proximal end of PA C ⁇ helix 4, i.e. containing 406--414 Amino acid segment, ⁇ -helix 5, ie, amino acid segment containing 440-450, ⁇ -helix 8, ie, an aryl acid segment containing 583-603, ⁇ -helix 9, ie, an aryl group containing 608 _ 613 Acid segment, ⁇ -helix 10, ie, the acetyl acid segment of 633-649, ⁇ -helix 11, ie, the aryl acid segment of 653-673, ⁇ -helix 12, ie the atmosphere of 683-691 Base acid segment, and a helix 13, ie containing 698
- the carboxy terminal PA C of the polymerase subunit PA of the influenza A virus consists of the alpha helix 1, ie, the amino acid segment containing 303 - 311, the alpha helix 2, ie, the amino acid segment containing 331 - 349, the alpha helix 3, that is, the 704-369-position amino acid segment, ⁇ -helix 6, which contains 454-475-position cyanoic acid segment And a helix 7, that is, an amino acid segment containing 572 to 578, surrounding the folded sheet ⁇ layer of the second portion of the carboxy terminal PA C of the PA, wherein the sputum or C influenza virus
- the segments corresponding to the a-helix and the ⁇ -sheet of the sputum-type influenza virus are shown in Figures 1A and 1B and Figures 1C and 10A and ⁇ , respectively.
- the carboxy-terminal PA C of the polymerase subunit quinone of the sputum influenza virus participates mainly in an aryl group with PB 1 through a helix 8, an alpha helix 10, an alpha helix 11 and an alpha helix 13 end ⁇ 1 ⁇ interaction, preferably at least one selected from the group consisting of [alpha] helix ⁇ influenza virus polymerase subunit PA C bully proximal end of the Leu666 1 1, the [alpha] helix Phe710 13, Val636 ⁇ helix 10, Leu640, ⁇ helix 13
- the amino acid in the group consisting of Trp706 and ⁇ -helix 11 of Gln670 is involved in the interaction with the influenza virus polymerase subunit PB 1 , wherein the a-helix of the influenza A virus of type B or C virus Corresponding segments are shown in Figures 1A and 1B and Figures 1C and 10A and B, respectively.
- PA C of the influenza virus polymerase subunit PA is selected from the group consisting of Ile621, Gly 622, Glu623, Thr618
- the amino acid in the group consisting of Pro620 and the Pro620 interacts with the influenza virus polymerase subunit PB 1 , wherein the B-type or C-type 3 ⁇ 4 u virus has a region corresponding to the a-helix of the A-type 3 ⁇ 4 ⁇ 4 virus.
- the segments are as shown in Figures 1A and 1B and Figures 1C and 10A and B, respectively.
- influenza virus polymerase subunit PA PA C ⁇ & ends of Asn647, Gln408, Cys584, Gln587, Gln591, Lys643, Asn647, Ser659, Lys663, Trp699, Asn703 configuration
- the amino acid in the group constitutes a "pocket" amino acid site in the influenza virus polymerase subunit PA C that binds to the influenza virus polymerase subunit PB 1 N , wherein the influenza B virus or type C virus
- the sections corresponding to the influenza A virus are shown in Figures 1A and 1B and Figures 1C and 10A and B, respectively.
- acid residues constitute a large loop, wherein B or C 3 ⁇ 4 u flu virus Type A 3 ⁇ 4 u virus corresponding
- the segments are as shown in Figures 1A and 1B and Figures 1C and 10A and B, respectively.
- the alpha helix 12 participate in interaction with other proteins, preferably at least one selected from the group consisting of Ile690, Glu691, Glu692, Cys693, Asn696 in the alpha helix 12 and the alpha helix 13
- the amino acids in the group are involved in interacting with other proteins.
- At least one amino acid selected from the group consisting of Lys506, Gly507, Arg508, Ser509, His510, Leu51 1, Arg512, Asn513, and Asp514 is involved in interaction with other proteins, wherein His510 constitutes a polymerase A portion of the complex RNase in which the segments corresponding to the influenza A virus of type B or C are as shown in Figures 1A and 1B and Figures 1C and 10A and B, respectively.
- the present invention provides a group comprising at least one of a carboxy terminal PA C of an influenza virus polymerase subunit PA selected from the group consisting of an alpha helix 8, an alpha helix 10, an alpha helix 1 1 and an alpha helix 13 a member, a polypeptide, a protein, an inorganic or an organic compound, preferably at least one selected from the carboxy terminal PA C of the influenza virus polymerase subunit, is selected from the group consisting of Leu666, ⁇ snail, Phe710, ⁇ snail of ⁇ -helix 1 1
- PA selected from the group consisting of an alpha helix 8, an alpha helix 10, an al
- the present invention provides at least one of the cyclic peptides between the alpha helix 9 and the alpha helix 10 in the carboxy terminal
- PA C of the influenza virus polymerase subunit PA selected from the group consisting of Ile621, Gly622, Glu623
- the segments are shown in Figures 1A and 1B and Figures 1C and 10A and B, respectively.
- the present invention provides an influenza virus polymerase subunit PA PA C carboxy-terminal of at least one selected from the group consisting of Asn647 of influenza virus polymerase subunit PA PA C bully in the proximal end, Gln408, Cys584 An amino acid-binding polypeptide, a protein, an inorganic or organic compound, an antibody or an immunoconjugate in a group consisting of Gln587, Gln591, Lys643, Asn647, Ser659, Lys663, Trp699, and Asn703, wherein the B or C type 3 ⁇ 4 u sense
- the sections of the virus corresponding to the type A 3 ⁇ 4 u virus are shown in Figures 1A and 1B and Figures 1C and 10A and B, respectively.
- the present invention provides an influenza virus polymerase subunit PA PA C terminal carboxy least one selected from the group consisting of Trp406 of influenza virus polymerase subunit PA PA C bully in the proximal end, Glu410, Lys461 An amino acid-binding polypeptide, protein, inorganic or organic compound, antibody or immunoconjugate in the group consisting of Glu524, Phe525, Ser526, Lys536, Lys539, Tyr540, Leu563, Tyr564, Arg566 and Lys574, wherein B
- the segments corresponding to influenza A virus in influenza or C influenza viruses are as shown in Figures 1A and 1B and Figures 1C and 10A and B, respectively. Shown in .
- the present invention provides a polypeptide, protein, inorganic or organic compound which binds to at least one of the carboxy terminal PA C of the influenza virus polymerase subunit PA, which is selected from the group consisting of amino acids 370 to 405.
- the antibody, antibody or immunoconjugate, wherein the segments corresponding to the A-type 3 ⁇ 4 u virus in the B-type or C-type 3 ⁇ 4 u virus are as shown in Figures 1A and 1B and Figures 1C and 10A and B, respectively.
- the present invention provides a combination with an alpha helix 12, an alpha helix 13 in a carboxy terminal PA C of an influenza virus polymerase subunit PA, preferably with at least one selected from the group consisting of an alpha helix 12 and an alpha helix 13
- the segments are as shown in Figures 1A and 1B and Figures 1C and 10A and B, respectively.
- the present invention provides at least one of the loop regions between the sheet ⁇ 4 and the sheet ⁇ 5 in the carboxy terminal PA C of the influenza virus polymerase subunit PA by Lys506, Gly507, Arg508, Ser509
- the segments are as shown in Figures 1A and 1B and Figures 1C and 10A and B, respectively.
- the present invention provides a polypeptide, a protein, an inorganic or organic compound, an antibody or an immunoconjugate which competes with the influenza virus polymerase PB 1 for binding to a PAC, wherein the influenza A virus of type B or C is associated with A
- the corresponding segments of the influenza virus type are shown in Figures 1A and 1B and Figures 1C and 10A and B, respectively.
- the present invention provides a method of interacting primarily with a hydrophobic core formed by alpha helix 8, alpha helix 11, alpha helix 13, alpha helix 10 in PA C , preferably by interaction with a helix 8 Met595, Leu666 in ⁇ -helix 11, Trp706 and Phe710 in ⁇ -helix 13, and Val636 and Val640 in ⁇ -helix 10, wherein the segments corresponding to influenza A virus in influenza B or C virus are respectively As shown in Figures 1A and 1B and Figures 1C and 10A and B.
- the present invention provides a polypeptide, protein, inorganic or organic compound, antibody or immunoconjugate that competes with influenza virus polymerase PB 1 for binding to PA C , wherein the polypeptide, protein, antibody or immune
- the amino acid sequence of the conjugate comprises at least PB 1 N residues of the wild-type influenza virus polymerase PB 1 at positions 5 to 10 of Pro5, Thr6, Leu7, Leu8, Phe9 and LeulO forming at least at least a short PTLLFL motif of the short helical region
- the three acid residues in the polypeptide sequence alignment with this motif are identical at the corresponding positions.
- the invention provides a composition comprising a polypeptide, protein, inorganic or organic compound, antibody or immunoconjugate as described above.
- the invention provides the use of a composition as described above for the manufacture of a medicament for the treatment of a disease caused by an influenza virus.
- the invention provides an expression and purification of an influenza virus polymerase subunit
- a method for antagonizing the PB 1 N complex of PA C and PB 1 comprising: (a) constructing an influenza virus polymerase subunit PA priming PA C for the fusion or non-fusion of a tagged protein gene from about 201 to about 301 amino acids to a carrier gene sequence-terminal amino acids from about 650 to, transformation of prokaryotic or eukaryotic cells with the vector, thereby expressing PA C with the tag protein; (b) with the expression of PA C similar
- the method expresses the PB1 N with or without a tag; (c) the cells of the influenza virus PAc obtained by (a) and the 48 amino acids of the end of the influenza virus PB 1 obtained by (b)
- the cells of the amino acid PB 1 N are mixed in proportion, and the mixed protein is separated by specifically recognizing the specific tag, and the tagged protein in the tagged polypeptide is removed by enzymatic hydrolysis, and the PA C is separated.
- PB1 N complex the protein concentration determined; wherein said virus polymerase subunit PA PA C and the proximal end bully dimensional crystal structure of the base end atmosphere PB1 N complex PB atoms having 1 listed in table 1 At least 40% atomic coordinates, or influenza virus polymerase subunit PA Average variance coordinates structural coordinates of atoms of the main chain carbon backbone 40% amino acid and in Table 1 is less than or equal to at least three-dimensional structure of the crystal atmosphere proximal end bully proximal end of PA C and PB1 to PB composite 1 N of 1.7 Ai.
- the invention provides an expression and purification of an influenza virus polymerase subunit
- PA carboxy terminal end group atmosphere PA C and PB1, PB1 N complex wherein the protein tag is selected from GST, Flag-tag, Myc- tag, MBP-tag, specific antibody; the vector contains a selectable marker
- the ratio of the total protein content of the tag protein-PA C and the tag protein-PB 1 N is 0.1:1 ⁇ 1:0.1, preferably the tagged protein-PA is mixed in the step (c).
- the total protein content is more preferable that the tag and tag protein C protein -PA -PB1 molar ratio close to 1: 1, preferably
- the tag protein is GST, and the method for identifying the specific tag is performed by an affinity column, and the method of removing the tag is by enzymatic hydrolysis, and the method for separating the complex of PA C and PB 1 N is by coagulation.
- the gel filtration or ion exchange chromatography is carried out, and the concentration of the determined protein is carried out by a method of gel electrophoresis.
- the invention provides an expression and purification of an influenza virus polymerase subunit
- the protease used is ProScission protease;
- the primer used for the vector is a restriction site selected from the group consisting of Sall and Notl;
- the cleavage site used when inserting the gene fragment An enzyme cleavage site selected from the group consisting of Sall and Notl;
- the influenza virus polymerase subunit PA primordial PA C gene fragment is obtained from the influenza A virus strain A by using a polymerase chain reaction PCR method Amplification obtained in the /goose/Guangdong/1/96 genome;
- the vector and the inserted gene fragment are respectively treated with an endonuclease such as an endonuclease selected from the group consisting of BamHI and Xhol, The
- the bacteria are transformed and induced by using IPTG, and the concentration of IPTG is preferably 0.1 to mM, and the cultured bacteria are obtained by centrifugation to obtain a flora expressing the fusion protein.
- the present invention provides an aryl terminal of a carboxy terminal PA C and PB 1 of a co-crystallized influenza virus polymerase subunit PA?
- the method of the 8 ⁇ complex comprises: concentrating the protein concentration of the purified PA C and PB1 N complex to 5-30 mg/ml; screening the crystal growth conditions by a vapor suspension method or a drop method; obtaining an influenza virus polymerization The crystal of the amino terminus of the enzyme subunit PA carboxy terminal PA C and PB 1 .
- the present invention provides an expression of the amino terminus of a PA? !
- PA N is from 1 to about 50 amino acids to about 200 to about 300 amino acids, including: construction of a fusion-encoding protein gene encoding influenza virus polymerase subunit PA PA amino terminal N 1 ⁇ from about amino acid 50 to atmosphere expression vector about 200 to about 300 amino acid gene sequence of the atmosphere, the transformed cells with this vector, to express PA N with the tag protein, wherein said atmosphere PA amino acid sequence in the N atmosphere PA proximal end having at least 40% of the listed acid Celgene FIG. 1 C than the same.
- the present invention provides a method of expressing the amino terminus of PA PA N wild-type or mutated protein, wherein the gene sequence of the amino terminus of polymerase subunit PA PA N clones by PCR and molecular
- a plasmid vector such as pGEX-6p, pGEX-4T, etc., such as pGEX system ⁇ 'J vector (Amersham Pharmacia), pET system J' J vector ( Novagen), pMAL-c2 (Invitrogen) series vector, etc.
- the PA N ⁇ terminus fusion GST fusion protein GST-PA N contains a penicillin resistance gene, and the PA cleavage terminal PAN polypeptide gene is cloned when the vector is ligated from pGEX-6p polyclonal
- Amplification was obtained in the /Guangdong/1/96 genome; the vector and the insert were separately inserted using the corresponding endonuclease such as an endonuclease selected from the group consisting of BamHI and Xhol, and the inserted gene was inserted by T4 DNA ligase.
- the E. coli was transformed into a cloning plasmid; the cloned plasmid described above was transformed into Escherichia coli BL21, and the transformed bacteria were cultured, and induced by IPTG using O.lmM to 1 mM, and the cultured bacteria were centrifuged to obtain an expression vector.
- the flora of the fusion protein was obtained in the /Guangdong/1/96 genome; the vector and the insert were separately inserted using the corresponding endonuclease such as an endonuclease selected from the group consisting of BamHI and Xhol, and the inserted gene was inserted by T4 DNA liga
- the invention provides a method of screening candidate compounds that compete with PB1 N for binding to PA C , the method comprising: (a) binding PAc to the surface of a fixed carrier; (b) overdosing Labeled PB 1 N is contacted with the immobilized PA C ; (c) fully eluted with an eluent to remove unbound PB1 N ; (d) candidate compound solution to be tested and (b) The fixed PAB N- bound PA C is contacted; (e) sufficiently eluted with the eluent to obtain a solution to be tested; (f) testing the free labeled label in the solution to be tested The concentration of PB 1 N ; (g) The binding ability of the candidate compound to PA C to be tested is estimated based on the concentration of the labeled PB IN free in the solution.
- the present invention provides a method of screening candidate compounds that compete with PB1 N for binding to PA C , wherein said step (a) binding PA C to a fixed surface is by covalent crosslinking or This is achieved by combining PA C with an affinity medium having a binding group for the affinity medium on a fixed surface.
- the present invention provides a method for screening a candidate competitive with PB1 N of PA C 4 dagger binding compound, wherein the affinity medium may be a GST, Flag-tag, Myc- tag, MBP Other polypeptides such as -tag, His-tag, specific antibodies, and the binding group on the immobilized surface of the corresponding affinity medium.
- the present invention provides a method of screening for a candidate compound that competes with PB1 N for binding to PA C , wherein the labeled PB1 N polypeptide is selected from the group consisting of an isotope or other chemical molecular marker protein, preferably, Other chemical molecular markers are selected from the group consisting of green fluorescent proteins, various other fusion polypeptides, such as binding to peroxidases, phosphohydrolases, protein kinases, various group transferases, and the like.
- the invention provides a method of screening candidate compounds that compete with PB1 N for binding to PA C , wherein the immobilized surface can be an affinity chromatography column.
- the present invention provides a three-dimensional crystal structure of a complex of a carboxy terminal PA C of an influenza virus polymerase subunit PA and an aryl terminal PB 1 N of PB1 in design and screening for treatment of influenza virus infection.
- the method for purifying the PAc protein according to the above expression; the method for purifying the PAc and the PB 1 N- terminal polypeptide complex according to the above expression; the drug screening according to the method for obtaining the protein crystal described above and the three-dimensional structure according to PA C and PB 1 N Conduct drug design.
- the invention provides a carboxy terminus of influenza virus polymerase subunit PA
- the crystal three-dimensional structure of the complex of PAc and PB 1 at the amino terminus PB 1 N is designed and screened for the treatment of various polypeptides, proteins, inorganic or organic compounds, antibodies or diseases caused by influenza virus infection.
- Applications in immunoconjugates include: designing polypeptides, proteins, inorganic or organic compounds, antibodies or immunoconjugate molecules that bind to specific sites by computer simulation based on the three-dimensional structural coordinates of the protein; based on the three-dimensional structural coordinates of the protein, by computer simulation Look for peptides, proteins, inorganic or organic compounds, antibodies or immunoconjugate molecules that may bind to specific sites; bind peptides, proteins or inorganic or organic compounds, antibodies or immunoconjugate molecules that are designed or sought based on the three-dimensional structural coordinates of the protein Including influenza virus polymerase protein containing any subtype of at least 50% of the same sequence as the PA C and PB1 N sequences, and then analyzing the binding; the polypeptide or protein designed or searched according to
- the present invention resolves PA end 257--716 residue fragment (C PA) and the proximal end 25 PB 1 atmosphere peptide (PB1 N) complex is 2.9 ⁇ resolution
- the crystal structure of the rate clearly shows the manner in which the carboxy terminus of PA interacts with the amino terminus of PB1 and the composition and spatial relative position of the amino acid residues involved in the binding, revealing the binding site of PA to RNA, revealing the carboxyl terminus of PA and the PB1 atmosphere.
- the three-dimensional structure model of the end complex reveals the secondary structure of the protein, reveals the nucleic acid binding site in the PA protein molecule, reveals the small molecule channel in the PA protein molecule, and reveals the surface charge distribution of the PA protein.
- Further study of the role of PA in the viral RNA polymerase complex provides a structural basis for drug screening using the protein expression purification method and crystallization method of the invention as described above, for designing interactions between PA and PB1, and PA and RNA and others.
- the protein-interacting drug provides a protein crystal platform and a three-dimensional structural platform for the purpose of achieving the activity of the influenza 4 virus polymerase.
- FIGS. 1A and B are sequences based on the C-terminus of the carboxy group of the PA protein from three different types of influenza viruses and the protein sequence of PB 1 N. A.
- A-OURS is the sequence of the C-terminal end of the PA protein from Avian influenza A virus strain A/goose/Guangdong/1/96
- A-1918 is the influenza A virus strain A/Brevig Mission/1/1918 influenza A virus
- the PA protein contains highly conserved acid residues.
- Figure 2 Purification of a pre-256 amino acid polypeptide fragment derived from a PA-based apical avian influenza A virus wild type virus strain A/goose/Guangdong/1/96. Wherein A is a pure 4 ⁇ protein used; the suspected gel is filtered to reflect the peak position of Superdex-200 (Amersham Pharmacia Inc.); B is the corresponding peak of the PA gas basal protein electrophoresis result; C is the final Purified PA amino terminal protein.
- Figure 3 Protein crystallization and diffraction obtained from purified PA amino terminus (1 - 256 residues) protein.
- a and B are crystals obtained under different crystallization conditions; C and D are X-ray diffraction patterns of two PA amino terminal protein crystals.
- Figure 4 Expression of purified PA C and GST-PB 1 N protein in the large intestine 4 strain, and PA C and
- FIG. 5 A side view of the overall structure of the PA C and PB1 N- terminal peptide complex, to clearly show the protein chain orientation;
- the image in Figure 5 (A) is rotated 180 degrees along the Y-axis, wherein the secondary structure is labeled, wherein the N-terminal peptide of PB1 and the two ends of PA C are indicated by arrows.
- Figure 6 Interaction between PA C and PB 1 N polypeptides, where: A. A surface map of the PA protein molecule; PB 1 N-terminal polypeptide is represented by a ribbon map, and PA molecules are represented by a surface charge distribution. B. Local amplification to observe the interaction between PA and PB1 primarily through hydrophobic interactions.
- Figure 7 Surface charge map of PA protein molecules.
- FIG. 8 Schematic representation of the large groove regions and channels present in the molecular structure of the PA C /PB1 N- terminal peptide complex.
- Figure A shows the large ditch area, which shows some of the alkaline acid residues in the distribution.
- Figures B and C show the structure of the channel region in the PA molecule from both sides of the molecule (180 degrees rotated along the X axis). Some conservative sialic acids inside and outside the channel are marked.
- Figure 9 Graphical interaction between PA-C and PB1-N polypeptides, where: A.
- D Local magnification to observe the interaction between PA and PB1.
- the PB1 N-terminal polypeptide is represented by a ribbon map, and the PA molecule is represented by a surface charge distribution.
- Figure 10 Figure 1A and B: are sequences based on the end of the PA protein from three different types of influenza viruses and the protein sequence of PB 1 N.
- A-OURS is the sequence of the C-terminal end of the PA protein from Avian influenza A virus strain A/goose/Guangdong/1/96
- A-1918 is the influenza A virus strain A/Brevig Mission/1/1918 influenza A virus
- C-1950 is the PA protein sequence of influenza C virus C/JJ/1950 from 1950; this result indicates influenza virus polymerase subunit
- the PA protein contains highly conserved acid residues.
- A-OURS Comparison of protein sequences based on PB 1 N from four different types of influenza viruses, wherein A-OURS, A-1918, B-1966, C-1950 are as described above, and the corresponding The amino acid deletion of the segment, the specific amino acid positions in the specification and claims are illustrated by A-OURS as an example.
- the box labeled Round Loop is the large loop region in the structure, and the other frame (not indicated) is the possible nucleic acid binding region.
- the arrow is the amino acid residue of the PA carboxy terminus that is involved in binding to the PB 1 short peptide.
- the specific amino acid positions in the specification and claims are described by taking A-OURS as an example.
- the specific amino acid positions in the specification and claims are exemplified by A OURS.
- the present invention provides a method of expressing a wild type or a mutant protein of influenza virus polymerase subunit PA in stages, and expressing and purifying the amino terminal and the carboxy terminal in Escherichia coli, respectively.
- the method consisting of the PA base end alone for crystallization experiments; the PA-derived end of the fragment containing 257-716 residues and the wild-type or mutant protein of the influenza virus polymerase subunit PB 1 PB 1 N-terminus
- the method for expressing the peptide in Escherichia coli and the method for purifying, respectively, and providing a method for crystallizing the PA base end and the PB 1 N-terminal peptide complex, and the PA C /PB 1 N short peptide complex thus obtained The crystal structure of the body, and the drug screening according to these crystallization methods, and the implementation of the drug design according to these crystal structures.
- a carboxy terminus of an influenza virus polymerase subunit PA is provided
- a three-dimensional structure of a complex of PA C and PB 1 N of the amino terminal PB 1 N wherein the carboxy terminal PA C of the influenza virus polymerase subunit PA is from about 201 to about 5% of the influenza virus polymerase subunit PA
- An amino acid of the 301-position amino acid to about 650-terminal wherein the PB 1 N of the PB 1 is short within 48 amino acids of the amino terminal PB 1 N of the influenza virus polymerase subunit PB 1 a peptide, wherein the atom in the three-dimensional structure of the crystal has at least 40% of the atomic coordinates listed in Table 1, or the carboxy terminal PA C of the influenza virus polymerase subunit PA and the amino terminal PB of PB 1
- the atomic structure coordinates of the main chain carbon skeleton of at least 40% of the amino acids in the crystal three-dimensional structure of the composite have an average variance of 1.7 angstroms with the coordinates in Table 1.
- a three-dimensional crystal structure of a complex of a carboxy terminal PAc of an influenza virus polymerase subunit PA and an aryl terminal PB 1 N of PB 1 wherein the influenza virus is selected from the group consisting of A and B , C-type 3 ⁇ 4 u virus, wherein the 3 ⁇ 4 u virus is preferentially selected from the type A 3 ⁇ 4 u virus strain: A/goose/Guangdong/1/96, A/Brevig Mission/ 1/ 1918; B-type virus strain : B/Ann Arbor/1/1966 or C-type 3 ⁇ 4 ⁇ 4 virus strain: C/JJ/1950.
- the base of the enzyme subunit PA PA C is ⁇ a helix 4 in the PA C of the influenza virus polymerase PA, ie, the acid segment containing 406 - 414, ⁇ helix 5, ie containing 440 - 450 amino acid segment, ⁇ helix 8, ie, 583-603 amino acid segment, ⁇ helix 9, ie 608-613 amino acid segment, ⁇ helix 10, ie 633-649 atmosphere
- Figs. 1A and 1B and Figs. 1C and 10A and B the amino acid of the segment corresponding to the type A 3 ⁇ 4 u virus in the sputum or C type 3 ⁇ 4 u virus is shown in Figs. 1A and 1B and Figs. 1C and 10A and B, respectively.
- the carboxy terminal PA C of the enzyme subunit PA is mainly involved in the interaction with the acyl terminal PB 1 N of PB 1 through ⁇ helix 8, ⁇ helix 10, ⁇ helix 11 and a helix 13 , preferably at least one selected from the group consisting of influenza virus polymerase In the group consisting of Leu666 of ⁇ -helix 11 of PA C , Phe710 of ⁇ -helix 13 , ⁇ snail of ⁇ helix 13 , Val636 of Le 10 , Leu 640 of snail, Trp706 of snail 13 , Gln 670 of snail, and Gln670 of spur 11
- the amino acid is involved in the interaction with the influenza virus polymerase subunit PB 1 , wherein the amino acid
- At least one of the cyclic peptides selected from the group consisting of Ile621, Gly622, Glu623, Thr618 and Pro620 is involved in the interaction with the influenza virus polymerase subunit PB1, wherein the influenza B or C virus is associated with
- the corresponding amino acid groups of the influenza A virus are shown in Figures 1A and 1B and Figures 1C and 10A and B, respectively.
- the B or C type influenza virus type a influenza virus of the corresponding acid gas section, respectively, as shown in FIGS. 1A and 1B and 1C and 10A and B Shown.
- the hydroxy group acid residue at positions 370 to 405 of the PA at the carboxyl terminal PA C of the PA constitutes a macrocycle, and the gas-based acid of the segment corresponding to the influenza A virus in the influenza virus of type B or C They are shown in Figures 1A and 1B and Figures 1C and 10A and B, respectively.
- the ⁇ -helix 12 and the ⁇ -helix 13 of the carboxy terminal PA C of the base PA participate in interaction with other proteins, preferably at least one selected from the group consisting of Ile690, Glu691, Glu692, Cys693, Asn696 in the ⁇ -helix 12 and the ⁇ -helix 13
- the gas-based acid is involved in interaction with other proteins, wherein the gas-based acid of the segment corresponding to the influenza A virus in the influenza B or C virus is as shown in Figures 1A and 1B and Figures 1C and 10A, respectively. And B are shown.
- the carboxy terminus of the influenza virus polymerase subunit PA of the invention are shown in Figures 1A and 1B and Figures 1C and 10A, respectively. And B are shown.
- At least one of the carboxy-terminal PA Cs of the influenza virus polymerase subunit PA is selected from the group consisting of an alpha helix 8, an alpha helix 10, an alpha helix 11 and an alpha helix 13 Member of a polypeptide, protein, inorganic or organic compound, wherein the influenza disease
- the poison is selected from the group consisting of influenza A, B, and C viruses, and the influenza virus is preferably selected from the influenza A strain: A/goose/Guangdong/1/96, A/Brevig Mission/ 1/ 1918; type B virus strain: B/Ann Arbor/1/1966 or influenza C virus strain: C/JJ/1950, wherein the polypeptide, protein, inorganic or organic compound is preferably carboxy terminal PA C with the influenza A virus polymerase subunit PA At least one amino acid selected from the group consisting of Leu666 of ⁇ -helix 11 , Phe710 of ⁇ -helix 13 , Val636 of ⁇ -helix 10, Leu
- At least one of the cyclic peptides between the alpha helix 9 and the alpha helix 10 in the carboxy terminal PA C of the influenza virus polymerase subunit PA is selected from the group consisting of influenza virus Ile621 An amino acid-binding polypeptide, protein, inorganic or organic compound, antibody or immunoconjugate in a group consisting of Gly622, Glu623, Thr618 and Pro620, wherein the influenza A virus of type B or C corresponds to influenza A virus The amino acids of the segments are shown in Figures 1A and 1B and Figures 1C and 10A and B, respectively.
- At least one of the carboxy terminal PA C of the influenza virus polymerase subunit PA is selected from Asn647, Gln408, which is selected from the carboxy terminal PA C of the influenza A virus polymerase subunit PA,
- the amino acids of the section of the susceptible virus corresponding to the type A 3 ⁇ 4 u virus are shown in Figures 1A and 1B and Figures 1C and 10A and B, respectively.
- a Trp406, Glu410, at least one of the carboxy-terminal PA C of the influenza virus polymerase subunit PA is selected from the carboxy-terminal PA C of the influenza A virus polymerase subunit PA,
- the amino acid of the segment corresponding to the influenza A virus in the influenza B virus or type C virus is shown in Figs. 1A and 1B and Figs. 1C and 10A and B, respectively.
- an influenza virus polymerase subunit PA PA carboxy-terminal C is selected from at least one influenza virus type A polymerase subunit PA PA bully proximal end of 370-405 C Amino acid-bound polypeptide, protein, inorganic or organic compound, antibody or immunoconjugate, wherein the amino acid of the segment corresponding to the type A 3 ⁇ 4 u virus in the type B or C type 3 ⁇ 4 u virus is as shown in the figure 1A and 1B and FIGS. 1C and 10A and B are shown.
- a carboxyl group is provided with an influenza virus polymerase subunit PA
- the ⁇ -helix 12 and the ⁇ -helix 13 in the terminal PA C are bound, preferably at least one of the carboxy-terminal PA C of the scorpion influenza virus polymerase subunit PA is selected from the group consisting of ⁇ -helix 12 and ⁇ -helix 13 in Ile690, Glu691, Glu692, Cys693, An amino acid-binding polypeptide, protein, inorganic or organic compound, antibody or immunoconjugate in the group consisting of Asn696, wherein the B-type or C-type 3 ⁇ 4 u virus has a segment corresponding to the A-type 3 ⁇ 4 u virus.
- the amino acids are as shown in Figures 1A and 1B and Figures 1C and 10A and B, respectively.
- at least one of the loop region between the sheet ⁇ 4 and the sheet ⁇ 5 in the carboxy terminal PA C of the influenza virus polymerase subunit PA is provided by a sputum influenza virus polymerase subunit.
- the polypeptide, protein, inorganic or organic compound, antibody or immunoconjugate that competes with the influenza virus polymerase PB 1 in combination with PA C is mainly passed through with ⁇ -helix 8, ⁇ -helix 11, ⁇ in PA C
- the hydrophobic core formed by the helix 13 and the alpha helix 10 interacts, preferably by the Met595 in the a helix 8 in the PA C of the influenza A polymerase subunit PA, the Leu666 in the alpha helix 11, the alpha helix 13 In the Trp706 and Phe710, and the Val636 and Val640 in the alpha helix 10, wherein the cyanoic acid of the segment corresponding to the influenza A virus in the influenza B or C virus is as shown in Figs.
- the polypeptide, protein, inorganic or organic compound, antibody or immunoconjugate of PA C is competed with the influenza virus polymerase PB 1 , wherein the polypeptide or protein At least three of the short helix region i or the short PTLLFL motif formed by 5 to 10 positions of Pro5, Thr6, Leu7, Leu8, Phe9 and LeulO are identical to the amino acid at the corresponding position in the polypeptide sequence alignment of this motif.
- a composition comprising the polypeptide, protein, inorganic or organic compound, antibody or immunoconjugate of the above claims, optionally comprising a carrier or an I-form.
- the use of the composition for the manufacture of a medicament for treating a disease caused by an influenza virus is provided.
- a method of expressing and purifying an acyl-terminal PB 1 N complex of a urinary end of the influenza virus polymerase subunit PA, PA C and PB 1 comprising: (a) constructing a vector encoding a gene sequence encoding an influenza virus polymerase subunit PA carboxy terminal PA C from about 201 to about 301 amino acid to about 650 to a terminal amino acid, fused or not. transforming prokaryotic or eukaryotic cells with the vector, thereby expressing PA C with the tag protein;
- a tagged protein in a polypeptide which separates a complex of PA C and PB 1 N to determine the concentration of the protein; wherein the viral polymerase subunit PA carboxy terminal PA C and the PB 1 aryl terminal PB1 N complex crystal three-dimensional
- the atom in the structure has at least 40% of the atomic coordinates listed in Table 1, or at least 40% of the crystal three-dimensional structure of the complex of the carboxy terminal PA C of the influenza virus polymerase subunit PA and the aryl terminal PB1 N of PB1
- the atomic structure coordinates of the main chain carbon skeleton of the amino acid and the average root variance of the coordinates in Table 1 are less than or equal to 1.7 angstroms.
- the vector contains a selectable marker gene, as described in step (c) protein is mixed with the label and tag -PA C molar ratio of the total protein -PB1 protein content of N is 0.1: 1 ⁇ 1: 0.1, preferably the label -PA C protein and protein-tagged proteins -PB total molar content. 1 N
- the ratio is 0.5:1 ⁇ 1:0.5, more preferably, the total protein content of the tag protein-PA C and the tag protein-PB1 is close to the molar ratio of 1:1, and the more preferred tag protein is GST, which is recognized by the specific tag.
- the method is carried out by an affinity column, and the method for removing the label is carried out by enzymatic hydrolysis, and the method for separating the PA C from the ⁇ 1 ⁇ complex is carried out by gel filtration or ion exchange chromatography, wherein the concentration of the protein is determined. It is carried out by a method of gel electrophoresis.
- the prokaryotic cell is Escherichia coli.
- a method of co-crystallizing influenza C polymerase subunit PA carboxy terminus PA C and PB 1 aryl terminal PB 1 N complex comprising: treating said purified PA C with PB 1 protein concentration of the N complex was concentrated to 5-30mg / ml; hanging drop method or vapor phase with the sitting drop crystal growth conditions screening method; obtaining of influenza virus polymerase subunit PA PA C and the proximal end bully atmosphere proximal end PB 1 N PBl The crystal of the complex.
- PA N is from 1 to about 50 amino acids to about 200 to about 300 amino acids, including: constructing a fusion or unfused tag protein gene encoding an influenza virus polymerase subunit PA amino terminus
- An expression vector for a gene sequence of PA N from 1 to about 50 amino acids to from about 200 to about 300 amino acids, using the vector to transform eukaryotic or prokaryotic cells to express a PA with or without a tagged protein N wherein the amino acid sequence in the PA ⁇ terminal PA N has the same alignment as at least 40% of the acid listed in Figure 1 C.
- the prokaryotic cell is Escherichia coli.
- a method of screening for a candidate 4 conjugate that competes with PB 1 N for binding to PA C is provided, the method comprising: (a) binding PA C to a surface of a fixed carrier;
- the affinity medium is fixed.
- a binding group having an affinity medium on the surface may be selected from the group consisting of GST, Flag-tag, Myc-tag, MBP-tag, specific antibodies, and the binding surface of the corresponding affinity medium on the immobilization surface.
- the labeled PB 1 N polypeptide is selected from the group consisting of an isotope or other chemical molecular marker protein, preferably, the other chemical molecular marker is selected from the group consisting of green fluorescent protein, various fusion polypeptides.
- the fixed surface is an affinity chromatography column.
- a three-dimensional crystal structure of a complex of a carboxy terminal PA C of the influenza virus polymerase subunit PA and an amino terminal PB 1 N of PB 1 is provided for design and screening for treatment
- Applications of various polypeptides, proteins, inorganic or organic compounds, antibodies or immunoconjugates of diseases caused by influenza virus infection including: designing polypeptides, proteins, inorganic or specific sites that bind to specific sites by computer simulation based on the three-dimensional structural coordinates of the protein An organic compound, antibody or immunoconjugate molecule; based on the three-dimensional structural coordinates of the protein, by computer simulation to find a polypeptide, protein, inorganic or organic compound, antibody or immunoconjugate molecule that may bind to a specific site; , a polypeptide, protein or inorganic or organic compound, antibody or immunoconjugate molecule designed or sought to bind to an influenza virus polymerase protein comprising any of the subtypes having at least 50% identical sequence to the PA C and PB1 N sequences
- the structure of three subunits PA, PB 1, PB2 or PA, PB 1 and PB2 complexes of any subtype of influenza virus polymerase is provided, wherein a protein or a A segment having at least 40% identical sequence to said PA C protein.
- a three-dimensional structure of influenza virus polymerase subunits PA, PB 1, PB2 or PA, PB 1 and PB2 complexes of any subtype is provided, wherein one protein or one of them is contained
- the three-dimensional structural coordinates of the main chain of the segment, and the PA C protein having an average of three-dimensional coordinates of the atomic carbon skeleton of the main chain carbon skeleton of at least 40% of the PA C protein sequence are less than or equal to 1.7 angstroms.
- influenza virus polymerase subunit PA PB 1, PB2 or the structure of the PA, PB 1 and PB2 complexes of any subtype is provided, wherein a protein segment is included
- the amino acid 1 - 11 segment of the PB1 N polypeptide has 20% sequence homology, preferably 40
- % sequence homology In a specific embodiment, a polypeptide or small molecule is provided which is characterized by interaction with any of the amino acids on the PA subunit of the influenza virus. In a specific embodiment, the use of the three-dimensional crystal structure in drug screening and drug design is provided.
- a method for screening a protein-bound polypeptide, protein, inorganic or organic compound, antibody or immunoconjugate based on a three-dimensional structure of a PA C and a PB 1 N protein comprising: obtaining a PA by a protein crystallization method a crystal of C , or a three-dimensional structure coordinate of a crystal containing a PA C and a PB 1 N protein complex; wherein the three-dimensional structure includes an average of three-dimensional coordinates of a main chain carbon skeleton atom having at least 40% of amino acid residues in the coordinate A structure in which the variance is less than or equal to 1.7 angstroms.
- a method for purifying expression of an influenza virus subtype PA subunit protein is provided: by expressing a PA segment in a bacterial or eukaryotic expression system, the deuterium is expressed and purified by the method containing any protein A segment has a protein of 40% identical amino acid sequence to the corresponding segment of the sequence.
- the influenza virus that is provided with the present invention bully polymerase subunit PA PA C and the base end of the composite structure PB 1, PB atmosphere proximal end 1 N in a helix 8, 10, A polypeptide, protein, inorganic or organic compound, antibody or immunoconjugate that interacts with an amino acid residue on a protein having at least 40% of the same amino acid in any of the segments 11.
- the influenza virus polymerase subunit PA gene was cloned into two parts, the amino terminus and the base of the protein, by molecular cloning technology.
- the base end includes the first 256-position amino acid, and the carboxyl end includes the 257th to the 716th acid.
- Part of the gene was cloned into the pGEX-6p vector (from Amersham Pharmacia Inc.) to express the fusion protein of GST-PA-N and GST-PA C , and the cloned plasmid was transformed into E. coli.
- IPTG isopropyl- ⁇ -D- galactosides
- a final concentration of 0.1 - 1 mM was used in BL21 to induce E.
- Example 1 The gene (including the first 25 peptide) within 48 amino acids of ⁇ 1 ⁇ was also cloned into the pGEX-6p vector to express the fusion protein of the fused GST-PB 1 N- terminal peptide. Similarly, a GST-fused PB1 N- terminal 25 amino acid short peptide or 48 amino acid short peptides were separately expressed, and the plasmid was also transformed into E. coli BL21, and the final concentration was 0.1 in BL21. ImM IPTG induces the expression of a protein in the large intestine 4, and the expression strain of the protein is obtained.
- the GST-PA-N-expressing bacteria were suspended in a buffer and then lysed, and the supernatant was obtained by centrifugation, and then an affinity chromatography column was used to purify the GST-PA-N fusion protein.
- the expression bacterium expressing GST-PA C and the expression bacterium expressing GST-PB 1 short peptide were suspended in a buffer containing about 20 mM Tris-HCl (pH 8.0) and 250 mM NaCl, respectively, and then scaled;
- the expression ratio of the total protein content of GST-PA C and GST-PB1 is 0.1:1 ⁇ 1:0.1, and the molar ratio of the total protein content of GST-PA C and GST-PB 1 is preferably 0.5:1.
- the total protein content of GST-PAc and GST-PB 1 is close to a molar ratio of 1:1.
- This mixed GST fusion protein was then purified using a Glutathione-Sepharose affinity column (from Amersham Pharmacia Inc.). After pre-lysis with PreScission protease (from Amersham Pharmacia Inc.), the PA C /PB 1 short peptide complex was isolated and purified by gel filtration of Superdex-200 and ion exchange chromatography (Q sepharose). At Amersham Pharmacia Inc., protein purity was determined by SDS-PAGE gel electrophoresis and used for further crystallization experiments. Crystallization and optimization of protein: Will the purified PA C be expressed by the above method?
- the complex of the polypeptide was concentrated to a concentration of about 5 - 30 mg/ml, and crystal growth conditions were selected by a vapor phase suspension method using a crystallization reagent (from Hampton Research) to obtain initial crystals under various crystallization reagent conditions.
- crystals having good appearance were obtained in a sodium acetate solution containing about 1 M under conditions of different pH buffers (pH 4-9).
- a large triangular pyramidal crystal was obtained in a buffer (pH 4-9) containing sodium acetate (from Sigma) at a concentration of 1-1.3 M, and the resolution was about 4 angstroms.
- Crystal data collection and structural analysis A set of 2.9 angstrom resolution mothers of PA-PB1 N-terminal 25 peptide complex crystals were first collected using a FR-E X-ray diffractometer (from Rigaku) at a wavelength of 1.5418 angstroms. data. Then use the synchrotron meter (line station number: SBC 19ID; detection screen: ADSC Q315) located in Chicago, USA, to collect two sets of peak and edge crystals with a resolution of 3.3 angstroms at wavelengths of 0.9783 and 0.9785 angstroms. Crystal data of deuterium atom derivatives.
- Example 1 Method for expressing influenza virus PA and PB 1 polypeptides One embodiment of the present invention is to express PA in two stages to express the 256-acid front fragment of the amino terminal of PA and 257, respectively. - 716 acid residue fragments, and the two gene fragments encoding the two protein polypeptides were separately cloned into an E. coli expression vector for protein expression in bacteria.
- the N-terminal polypeptide of PA was purified from the N-terminal (1 - 256 amino acid) bacteria expressing PA alone, and the N-terminal peptide of PA was used for protein crystallization.
- the carboxy terminal expression plasmid of PA was collected by centrifugation and used for co-purification with the PB1 N-terminal polypeptide.
- the polypeptide containing the first 25 or 48 amino acids of the PB 1 base (excluding the first thiol amino acid) is expressed in bacteria as a GST fusion protein.
- Influenza virus polymerase protein subunit PA is segmented in bacteria or other eukaryotic cells to perform a method of expressing at least 50% of the PA protein fragment of a portion of the 257-716 ⁇ acid segment. Expression of the influenza virus PA end in Bacillus subtilis The amino terminus (amino acids 1 to 256) of influenza virus PA was cloned into the pGEX-6p vector (from Amersham Pharmacia Inc.) by molecular cloning technology, and the cloning site was It is BamHI and XhoI.
- the cloned expression plasmid containing the PA ⁇ terminal gene was transformed into the large intestine In Bacillus sp. BL21, protein expression is carried out, so that the bacteria can express the N-terminal end of the PA protein (the acetyl terminal) to which the GST fusion protein is ligated and contain a cleavage site that can be cleaved by ProScission protease (Amersham Biosciences), thereby further GST
- the protein tag is separated from the target protein PA polypeptide.
- Escherichia coli was induced in the cultured large intestine 4 dry bacteria BL21 fine moon packet using IPTG at a final concentration of about 0.1 to 1 mM to obtain an expression strain of the protein.
- the vector used contained an ampicillin resistance gene.
- Escherichia coli such as BL21 ( Novagen)
- the bacteria were cultured overnight at 37 degrees using a bacterial culture medium such as LB, and transferred to a large amount of medium at about 1:100 after about 12 hours, 37 degrees.
- the collected precipitated bacteria can be placed in a - 20 to 80 degree refrigerator. It can be used for purification of PA ⁇ terminal protein.
- influenza virus PA-end and PB 1 polypeptide complexes The carboxy terminus (amino acids 257 to 716) of influenza virus PA was cloned into the pGEX-6p vector (from Amersham Pharmacia Inc.) by molecular cloning technique, and cloned The sites are BamHI and NotI.
- the cloned expression plasmid containing the carboxy terminal gene of PA was transformed into E. coli BL21 to express the protein, so that the bacteria can express the N-terminal (amino terminus) of the protein linked to the GST fusion protein and contain the ProScission protease (Amersham Biosciences).
- the cleavage site of the cleavage further separates the GST protein tag from the target protein PA polypeptide.
- Escherichia coli was induced in the cultured large intestine 4 dry bacteria BL21 fine moon packet using IPTG at a final concentration of about 0.1 to 1 mM to obtain an expression strain of the protein.
- the vector used contained an ampicillin resistance gene.
- Bacteria After the cloned fusion protein expression plasmid was transformed into Escherichia coli such as BL21 ( Novagen), the bacteria were cultured overnight at 37 degrees using a bacterial culture medium such as LB, and transferred to a large amount of medium at about 1:100 after about 12 hours, 37 Incubate in shake flasks to a OD of about 1.0, then raise the temperature to 16 degrees, then force p into 0.1-lmM IPTG for induction, and collect the bacteria by centrifugation after about 12 to 24 hours. Bacteria can be stored in a - 20 to 80 degree freezer or used directly for purification.
- a bacterial culture medium such as LB
- the gene within 48 amino acids of the N-terminal of PB1 (the inventors expressed the first 48 amino acid polypeptides of PB 1 and the first 25 amino acid peptides) were also cloned into the multiple cloning position of the pGEX-6p vector.
- the cleavage sites used are BamHI and Xhol, so that the bacteria can express the GST-containing fusion protein, and the fusion protein contains a protease site which can be cleaved by ProScission protease (Amersham Biosciences), thereby further separating the GST tag and the purpose.
- the fusion protein of the fusion GST-PB 1 N- terminal peptide was expressed in E.
- the expressed bacteria are collected by centrifugation, and the bacteria can be directly used for protein purification, or temporarily stored in a refrigerator of - 20 degrees to _80 degrees for use.
- the collected bacteria expressing the GST-PA amino terminal polypeptide collected by centrifugation were suspended in a buffer buffer containing about 20 mM Tris-HCl (pH 8.0) and 250 mM NaCl or 1X PBS (pH 7.4), using ultrasonic disruption.
- the cells were disrupted, the insoluble precipitate was removed by centrifugation, the soluble supernatant was collected, and the GST-PA-N polypeptide was purified using a Glutathione affinity chromatography column, and then the fusion protein was digested with ProScission protease to decompose the fusion protease into GST.
- the PA-N protein polypeptide was purified by ion exchange chromatography and gel exclusion chromatography using the glycoside S-transferase and PA-N. The protein was concentrated to 5-30 mg/mL for crystal growth.
- the expression bacterium expressing the GST-PA C carboxy terminal polypeptide and the expression bacterium expressing the GST-PB 1 N short peptide were respectively used in a buffer containing about 20 mM Tris-HCl (pH 8.0) and 250 mM NaCl or lxPBS (pH 7.4).
- the phosphate buffer is suspended, and then the two expression bacteria are mixed in proportion, so that the total protein content of GST-PA and GST-PB 1 is 0.1:1 ⁇ 1:0.1, preferably GST-PA and GST-PB.
- the molar ratio of the total protein content of 1 is 0.5:1 to 1:0.5, and it is more preferable that the total protein content of GST-PA and GST-PB 1 is close to a molar ratio of 1:1.
- the mixed bacterial suspension is lysed by ultrasonic or other fine; packet lysis method, and the insoluble fraction and the soluble fraction of the bacterial lysate are separated by centrifugation, and the supernatant obtained after high-speed centrifugation (about 20,000 g) is passed through the use of Glutathione- The Sepharose affinity column (from Amersham Pharmacia Inc.) was used to initially isolate and purify this mixed protein, and the GST-tagged protein could bind to the Glutathione-Sepharose affinity column, while other proteins could not bind to the affinity column. After binding of the protein to the affinity column, the heteroprotein is washed away using the bacterial suspension buffer as described above.
- the mixed GST fusion protein on the affinity column was digested with an appropriate amount of ProScission protease (from Amersham Pharmacia Inc.), which typically took about 24 hours.
- the enzymatically cleaved PA C and PB1 N fusion proteins were further separated by pure gel filtration using Supergel-200 (from Amersham Pharmacia Inc.) and Q sepharose ion exchange (from Amersham Pharmacia Inc.).
- the PA C /PB1 N short peptide complex was obtained, and the purity of the protein was generally more than 90% after SDS-PAGE gel electrophoresis.
- the protein purified by the above procedure was concentrated to about 5 - 30 mg/mL using a concentrating tube (from Millipore) for further crystallization experiments. It will be known to those skilled in the art that the base of the PA of the influenza virus and the base of the PA are known.
- the acyl terminal PB 1 N of PA C and PB1 can be expressed not only in the prokaryotic details described herein; but also in cells such as large intestine 4 stem cells, and can also be expressed in eukaryotic cells such as insect cells; Endonuclease, cleavage site, ligase; the target polypeptide to be purified can also be fused with other tags such as GST, and then purified by the corresponding separation and purification method, and finally the fusion is fused to the target.
- eukaryotic cells such as insect cells
- Endonuclease, cleavage site, ligase the target polypeptide to be purified can also be fused with other tags such as GST, and then purified by the corresponding separation and purification method, and finally the fusion is fused to the target.
- Crystallization of PAr/PB 1 ⁇ short peptide complex The complex of purified hydrazine and PB 1 polypeptide expressed as above was concentrated to a concentration of about 5 - 30 mg/mL, and the crystallization reagent was used by vapor suspension method (from Hampton Research Such as the company's Screen Kit 1/11, Index and other kits) screen crystal growth conditions. After preliminary screening, the inventors obtained initial crystals under a variety of different crystallization reagent conditions. By further optimization, crystals having good appearance were obtained in a sodium acetate solution containing about 1 M under conditions of different pH buffers (pH 4-9).
- a large triangular pyramidal crystal was obtained in a buffer (pH 4-9) containing sodium acetate (from Sigma) at a concentration of 1-1.3 M, and the fraction was about 4 angstroms.
- a buffer pH 4-9 containing sodium acetate (from Sigma) at a concentration of 1-1.3 M, and the fraction was about 4 angstroms.
- H starts to increase the corresponding crystallization buffer solution containing 1.4 M sodium acetate and 10% glycerol (from Sigma).
- the high-resolution protein crystals are obtained, and the resolution of the mother and selenoprotein crystals can reach 2.9 angstroms or more.
- the B-type or C-type 3 ⁇ 4 u virus is involved.
- the corresponding segments of the a-helix and the beta-sheet of the type A i ⁇ u virus are shown in Figs. 1A and 1B and Figs. 1C and 10A and ⁇ , respectively, and are again described herein.
- Crystal structure of PAr/PB 1 N short peptide complex A set of N-terminal 25 peptide complex crystals of PA-PB 1 was first collected using a FR-E X-ray diffractometer (from Rigaku) at a wavelength of 1.5418 ⁇ . The parent data is 2.9 angstroms. Then use the synchrotron meter (line station number: SBC 19ID; detection screen: ADSC Q315) located in Chicago, USA, to collect two sets of peak and edge crystals with a resolution of 3.3 angstroms at wavelengths of 0.9783 and 0.9785 angstroms. Crystal data of selenium atom derivatives.
- the inventors can clearly see several secondary structures (including some a-helix and ⁇ -fold), and then the inventor uses the program CAD for phase expansion, using the received parent data.
- the phase model was extended to 2.9 angstroms for the construction of the model.
- the procedures used for model construction were ARP/wARP (Perrakis, Morris et al. 1999) and Phenix (Adams, Grosse-Kunstleve et al. 2002).
- the automatic model building of these two programs can complete about 60% of the entire structure, and the rest is manually built using the program COOT (Emsley and Cowtan 2004).
- the obtained model was corrected by the program CNS (Brunger, Adams et al. 1998) and REFMAC5 (Murshudov, Vagin et al. 1997), and the results obtained were analyzed for the structure of the protein, and the final R factor of the structure was corrected.
- the R-free factors are 0.23 and 0.26, respectively.
- PA l ⁇ terminal protein crystallization The complex of the purified PA amino terminal polypeptide expressed by the above method was concentrated to a concentration of about 5 - 30 mg/mL, and a crystallization reagent was used by a vapor suspension method (Screen Kit 1/ from a company such as Hampton Research) 11, Index and other kits) Screening crystal growth conditions. After preliminary screening, the inventors obtained initial crystals under a variety of different crystallization reagent conditions.
- Example 5 Screening and? 8 ⁇ Competing with the small molecule method of PA C in the screening of a small molecule drug that can depolymerize the PA C /PB 1 N short peptide complex, the gene of PB 1 N short peptide and the expression of GFP ( Gene fusion of green fluorescent protein, expressing GFP-fused PB 1 N short peptide protein, as an indicator molecule for small molecule compound depolymerization protein complex.
- the PB 1 short peptide gene fragment was ligated to the GFP gene fragment by a molecular cloning method to express a PB 1 small peptide fusion protein having an acetyl terminal or a carboxy terminal linked to GFP.
- Method 1 The method of expressing and purifying the carboxy terminal of PA and the short peptide of PB 1 as described above, and expressing the fusion of the GST-terminal fusion protein of GST, GST-PA C fusion protein and GFP-PB 1 N short peptide fusion protein body.
- a complex of GST-PA C fusion protein and GFP-PB 1 N short peptide fusion protein was passed through and bound to a Glutathione affinity column. Since the complex contains a GFP protein, the GST-PA C binds to the affinity column, and the GFP-PB 1 N fusion protein bound to GST-PA C makes the affinity column green.
- the affinity column after binding to the GST-PA C and GFP-PB 1 N complex proteins was washed thoroughly with buffer to completely elute the unbound protein. Then, a mixture of the small molecule compounds to be screened is passed through the affinity column (the mixture should not contain Glutathione or other components that can elute GST from the affinity column), if the mixture contains an alternative PB 1 N polypeptide binds to the small molecule of PAc, so that the GFP-PB 1 N polypeptide fusion protein partially bound to PA C is replaced and eluted, and the eluted solution elutes at a certain wavelength due to the GFP fusion protein. Green under the microscope.
- the small molecule is separated and purified stepwise from the mixture, and the component which can replace the PB 1 N polypeptide is traced by the green GFP protein tracer method as described above, thereby finally determining the small molecule compound which interferes with the binding of PA to the PB 1 small peptide.
- affinity medium in addition to the use of GST as an affinity medium, other polypeptides such as Flag-tag, Myc-tag, MBP (Maltose binding protein)-tag, specific antibodies, and the like can also be used as affinity.
- the affinity chromatography column also uses the corresponding affinity medium, such as when using Flag-tag, anti-Flag-tag antibody (such as Sigma Inc.
- the antibody is immobilized on an affinity chromatography column as a gel medium that binds to Flag.
- a compound molecule that binds to PA and replaces a PB 1 small peptide (specific structure) can be determined by a method such as mass transfer to determine its chemical structure.
- Method 2 PA C is purified separately (fusion protein or non-fused protein), which is covalently cross-linked to the gel medium by chemical crosslinking, but maintains protein invariance.
- GFP-PB 1 N was passed through a covalently bound gel column to bind the GFP-PB IN fusion protein to the PA C protein, whereby the gel column exhibited GFP green fluorescence.
- the GFP-PB 1 N fusion protein is eluted, and the eluate is excited by light at a specific wavelength. Green is present, and the compound molecule that replaces GFP-PB 1 N binds to the PA C molecule on the gel column.
- Using a buffer elute the gel column to remove impurities, and then use PA or the like to denature the PA C , elute the small molecules bound thereto, and analyze the small molecules bound to the PA by mass spectrometry. Further, the small molecule structure information is obtained.
- This compound can be a small molecule drug that depolymerizes the PA C /PB 1 N short peptide complex.
- Example 6 Crystal three-dimensional structure design and screening using PA C /PB 1 N complex for the treatment of influenza D structure design crystal virus infection disease caused by a variety of peptides, proteins, or inorganic or organic compounds using the method of influenza virus polymerase subunit PA atmosphere proximal end of the proximal end bully PB1 PA and PB-C composite and 1 N Screening various polypeptides, proteins or inorganic or organic compounds for the treatment of diseases caused by influenza virus infection, the specific steps are as follows: According to the three-dimensional structural coordinates of the protein, the polypeptides and compound molecules binding to specific sites are designed by computer simulation; The three-dimensional structure coordinates of the protein, through computer simulation to find the polypeptide and compound molecules that may bind to specific parts; according to the three-dimensional structure coordinates of the protein, the polypeptides and compound molecules designed or searched for binding to the PA C and PB 1
- Example 7 Design and screening of crystals using PA C /PB1 N complexes
- the small peptides used to treat diseases caused by influenza virus infection have been confirmed by the fact that one contains Ml, D2, V3, N4, P5.
- the short peptides of T6, L7, L8, F9, L10 and Kl l bind to the base of PA.
- the inventors cloned the polypeptide gene containing PB1N from the first M1 to the 11th Kl1 into the pFEX-6p vector, purified the GST-PB 1N fusion protein, and immobilized on the affinity chromatography gel by in vitro binding experiments.
- the fusion protein on the column decouples the PA-C in solution, and the inventors found that the fusion protein retains the ability of PB1N to bind to PA-C.
- a fusion protein containing M1, D2, V3, N4, P5, T6, L7, L8, F9, L10, Kl l, V12 and pl3 also retains the PB 1N possession. Combine the capabilities of PA-C.
- the ability of these two short peptides to bind to PA-C makes it a potential peptide drug that interferes with influenza virus polymerase activity or becomes a model for further drug design.
- the selected polypeptide sequence has at least 3 amino acid sequences aligned with the same polypeptide as the above polypeptide, which may become a potential polypeptide drug that interferes with influenza virus polymerase activity.
- Any subtype of influenza virus polymerase subunit PA, PB1, PB2 or a structure of a PA, PB1 and PB2 complex, wherein a protein or a segment thereof is included, having at least 40 with the PA C protein The same sequence of %.
- the PA C protein sequence has an average ⁇ variance of at least 40% of the three-dimensional coordinates of the backbone carbon skeleton, which is equal to 1.7 angstroms.
- Any polypeptide or small molecule interacts with a key amino acid on the PA subunit of the influenza virus.
- the structure is used in drug screening and drug design.
- the structure is used in drug screening and drug design.
- the polypeptide for treating a disease caused by influenza virus infection I comprises, in combination with a complex as described above, at least one of said ⁇ -helix or ⁇ -sheet, at least one amino acid site The peptide of action.
- the protein for treating a disease caused by influenza virus infection I comprises a complex as described above, at least one of said alpha helix or beta sheet, at least one acid site Interacting proteins.
- a 4-conjugate for treating a disease caused by a viral infection comprising a complex as described above, at least one of said alpha helices or beta sheets, at least one ⁇ The compound of the acid site interaction.
- the pharmaceutical composition comprises a polypeptide, protein or compound as described above.
- the pharmaceutical composition of the present invention usually comprises a carrier or a pharmaceutically acceptable carrier, and the antibody and/or immunoconjugate is dissolved in a pharmaceutically acceptable carrier, and an aqueous carrier is preferred.
- aqueous carriers can be used, such as buffered saline and the like. These solutions are sterile and usually free of undesirable materials. These components can be sterilized by conventional, well known sterilization techniques.
- auxiliary substances required for pharmaceutically acceptable approximate physiological conditions such as buffers for adjusting pH, toxicity modulators, and the like, such as sodium acetate, sodium chloride, potassium chloride, calcium chloride, sodium lactate, and the like.
- concentration of the fusion protein in these components varies widely, and is primarily selected based on the amount of fluid, viscosity, weight, etc., consistent with the particular mode of administration chosen and the needs of the patient. Therefore, a typical pharmaceutical immunotoxin component administered to the brain in the present invention should be administered about 1.2 to 1200 ug per day.
- a typical component for the treatment of breast, ovarian, and intrapulmonary tumors by intravenous administration, each patient is administered approximately 0.1 to 10 mg per day.
- a dose of 0.1 to 100 mg per person per day can be used, especially when the drug is to be administered in a concealed position and does not enter the blood circulation or lymphatic system, for example, into a body cavity or an organ cavity.
- Administration practical methods for preparing component is professionals understand or master, there are described in detail in a number of publications, for example, Remington's PHARMACEUTICAL SCIENCE, 19 th ed ., Mack Publishing Company, Easton, Pennsylvania (1995).
- the components of the invention are useful in therapeutic treatment.
- a component is administered to a patient suffering from a disease (such as a glioblastoma, breast cancer, ovarian cancer, and lung cancer) at a dose sufficient to at least partially slow or partially control the species. Disease and its complications.
- a dose sufficient to accomplish these tasks is referred to as a "therapeutically effective dose.”
- the effective dose to be applied depends on the severity of the disease and the general health of the patient.
- An effective dose of the component can provide a subjective identifiable relief of a symptom or an objective improvement recorded by a clinician or other qualified observer.
- the dose and frequency of patient need and tolerance determine whether to administer single or multiple doses.
- a sufficient amount of the immunotoxin should be provided to effectively treat the patient.
- the dose of the drug is administered once, but may also be administered periodically until a therapeutic effect or adverse reaction is prevented which prevents the treatment from continuing. Generally, these doses are sufficient to treat or ameliorate the disease without causing toxicity that the patient cannot tolerate.
- the immunoconjugates of the invention can be prepared as parenteral sustained release dosage forms (e.g., implants, oil injections, or particle systems).
- parenteral sustained release dosage forms e.g., implants, oil injections, or particle systems.
- Particle systems include spheres, microparticles, microcapsules, nanocapsules, nanospheres, and nanoparticles.
- Microcapsules use therapeutic protein as a core. In the small sphere, the therapeutic substance is dispersed in the particles.
- Particles, spheres, and capsules less than about ⁇ ⁇ are generally referred to as nanometers: granules, nanospheres, and nanocapsules, respectively.
- the diameter of the capillaries is approximately 5 ⁇ m, so only the nanoparticles can be administered intravenously.
- the opening particles are approximately ⁇ in diameter and are administered by subcutaneous or intramuscular injection. See, for example, Kreuter, J., COLLOIDAL DRUG DELIVERY SYSTEMS, J. Kreuter, ed., Marcel Dekker, Inc., New York, NY, pp. 219-342 (1994); and Tice & Tabibi, TREATISE ON CONTROLLED DRUG DELIVERY , A. Kydonieus, ed" Marcel Dekker, Inc. New York, NY, pp. 315-339, (1992), both of which are cited in it. Multimers can be used in the immunoconjugates of the invention Ion controlled release of the components.
- hydroxyphosphorus a microcarrier have also been used as limestone protein controlled release (. Ijntema the like, Int J. Pharm 112:. 215-224 (1994)) 0
- Yet another Liposomes are used for controlled release and targeted transport of lipid coated drugs (Betageri et al, LIPOSOME DRUG DELIVERY SYSTEMS, Technomic Publishing Co., Inc., Lancaster, PA (1993)).
- Many others A therapeutic protein controlled release system is known. See, for example, U.S. Patent Nos.
- Atom 1045 NE ARGA401 1.0081.24 N Atom 1046 CZ ARGA401 1.0092.20 C Atom 1047 NHl ARGA401 1.0074.99 N Atom 1048 NH2 ARGA401 1.0093.37 N Atom 1049 C ARGA401 1.0072.21 C Atom 1050 O ARGA401 1.0076.72 O Atom 1051 N SERA 402 1.0068.12 N Atom 1052 CA SERA 402 1.0070.31 C Atom 1053 CB SERA 402 1.0071.40 C Atom 1054 OG SERA 402 1.0079.39 o Atom 1055 C SERA 402 1.0069.11 c Atom 1056 O SERA 402 1.0073.
- Atom 171 CA LEU A 417 48.982 20.305 46.276 1.0071.69 C Atom 172 CB LEU A 417 48.482 18.869 46.107 1.0072.24 c Atom 173 CG LEU A 417 49.194 18.039 45.038 1.0078.14 c Atom 174 CD1 LEU A 417 48.882 16.555 45.185 1.0069.
- Atom 2305 CA ARG A 566 55.377 47.877 51.601 1.00 60.55 Atom 2306 CB ARG A 566 56.268 46.637 51.524 1.00 58.95 Atom 2307 CG ARG A 566 55.956 45.724 50.348 1.00 55.73 Atom 2308 CD ARG A 566 57.163 44.887 49.964 1.00 54.02 Atom 2309 NE ARG A 566 58.109 45.662 49.170 1.00 69.19 Atom 2310 CZ ARG A 566 59.348 45.267 48.891 1.00 62.92 Atom 2311 NHl ARG A 566 59.801 44.103 49.345 1.00 68.11 Atom 2312 NH2 ARG A 566 60.142 46.034 48.158 1.00 59.65 Atom 2313 C ARG A 566 55.445 48.638 50.287 1.00 64.51 Atom 2314 O ARG A 566 54.603 48.453 49.408 1.00
- Atom 2552 CGI ILE A 596 60.079 0.490 31.949 1.00121.40 Atom 2553 CD1 ILE A 596 58.663 0.789 31.513 1.00116.32 Atom 2554 CG2 ILE A 596 60.619 8.998 30.015 1.00125.91 Atom 2555 C ILE A 596 63.348 9.344 30.297 1.00124.38 Atom 2556 O ILE A 596 63.467 8.121 30.328 1.00129.89
- Atom 3061 CA SERA 662 77.330 25.997 41.116 1.00 61.18 C Atom 3062 CB SER A 662 76.087 26.223 41.979 1.00 56.20 c Atom 3063 OG SER A 662 74.962 26.536 41.177 1.00 56.79 o Atom 3064 C SERA 662 77.132 24.783 40.214 1.00 62.28 c Atom 3065 O SERA 662 77.280 23.643 40.654 1.00 64.49 o Atom 3066 N ARG A 663 76.794 25.032 38.953 1.00 62.49 N Atom 3067 CA ARG A 663 76.634 23.958 37.983 1.00 63.87 c Atom 3068 CB ARG A 663 76.152 24.514 36.643 1.00 68.01 c Atom 3069 CG ARG A 663 74.996 23.735 36.038 1.00 84.65 c Atom 3070 CD ARG A 663 74.780 24.088 34.575
- Atom 3203 CA THR A 680 93.778 20 0 1.0064.47 c Atom 3204 CB THR A 680 95.218 20.36 1.0062.30 c Atom 3205 OGl THR A 680 96.027 9.2 :3:: 1.0058.02 o Atom 3206 CG2 THR A 680 95.768 •60( L 1.0054.44 c Atom 3207 C THR A 680 92.914 .3 '5:2 1.0062.14 c Atom 3208 O THR A 680 92.886 .9 )6' 3 1.0057.00 o Atom 3209 N PHE A 681 92.210 .7 '1: 9 1.0065.30 N Atom 3210 CA PHEA681 91.247 222222 :.80i7 1.0062.48 c Atom 3211 CB PHE A 681 89.836 .22:9 1.0062.48 c Atom 3212 CG PHE A 681
- PA N-terminal 1 _ 256 residues (see Figures 1 and 2) and 257-716 residues (see Figure 4A) by fusion with GST (Glutathione S-Transferase)
- PA_N The purified PA amino terminus (PA_N) gave good diffraction of the parent crystal (see Figure 3).
- Preliminary crystallization experiments show that, despite extensive efforts, the C-terminal end of the PA itself has not been crystallized. Therefore, the inventors also expressed PB 1 N-terminal 25 and 48 peptides respectively using the GST fusion method (see FIG.
- band 4A which is an electric 'swimming diagram before and after GST fusion of the C-terminus of PA and the N-terminus of PB 1 , wherein the bands 1 PA-C CT is a C-terminal control of PA.
- Band 2 GST-PBl+PAc is a sample of the C-terminus of PA and the N-terminal complex of PB1 and GST, and band 3 GST-PB 1 is PB1.
- the sample with N- terminal fusion with GST, band 4 GST+PA C is a sample of PA C-terminal fusion with GST, and band 5 GST CT is a GST control; wherein PA-C represents the electrophoresis band of PA-C GST-PB 1 is an electrophoresis band of PB 1 N- terminal fusion with GST, and GST is an electrophoresis band of GST control.
- GST-PB 1 can bind purified PA-C protein.
- PB1 is like a bite in the mouth of a PA.
- the PA portion is mainly composed of 13 ⁇ helices, 1 segment of 3 ⁇ helix, 7 ⁇ sheets, and a loop connecting these structures (Fig. 1, 4B and Fig. 5).
- the PA protein portion can be viewed as having two domains, one being the region that binds to the PB 1 polypeptide (domain I, the first part of the PA carboxyl end structure), all composed of a helix and a loop, There are 4, 5, 8, 9, 10, 11, 12, and 13 to form the mouth and cheeks of the wolf's head.
- This domain is narrower from the top of the wolf head; the other domain (domain II, the second part of the PA carboxyl end structure) is the second half of the wolf head consisting of the remaining spiral and beta sheets, seen from the top It is wider and has a large ring attached to it, which seems to be the neck part of the wolf's head.
- the apical end of the PB 1 polypeptide is located on one side of the wolf head, and the C end is located on the other side, which is equivalent to the two face sides of the wolf head.
- the guanidine in the crystal of the present invention is a polypeptide which removes 256 residues of ⁇ at the ⁇ end, and it is reported that the scorpion end is the main active region of chymotrypsin, and the other distant active site Ser624 is located on the other side of the face frequency.
- Ser624 is the PA protease active center amino acid, which together with the PA removed portion constitutes the protease active region i or, so the N-terminal removed portion of the PA is located on the other cheek side.
- the second half of the second half of the head consists of the remaining plurality of helices and beta sheets.
- Interaction between PA and PB 1 polypeptides Domain I binding to the PB1 polypeptide is helical 4 (406 - 415 ), 8 ( 582 -
- the fourth helix (10) extends obliquely, sandwiching the PB 1 polypeptide ( Figures 5 and 6), and the helix 4 interacts laterally with the PB1 N- terminal peptide residue.
- the four helices form a hydrophobic core in the region of the bound PB 1 polypeptide, and their side chains are bonded to the hydrophobic amino acid residues on PB 1 by hydrophobic interactions and hydrogen bonding interactions.
- the PB 1 polypeptide can be seen from the second aspartic acid to the 15th glutamine at the electron cloud density. This result is consistent with the report by Perez et al. that the first 12 amino acids of the N- terminal PB 1 are combined with PB1 and PA. The results of the key amino acids are basically consistent (Perez and Donis 2001). Further, the inventors analyzed the interaction between these amino acid residues and PA. In the Perez et al. (Perez and Donis 2001) article, the 4-leading PB 1 conserved LLFL peptide is present on a short helix suspended in the middle of the hydrophobic core formed by PA.
- the cyano acid residues in which PA participates in the formation of a hydrophobic core are Leu666 on helix 11, Phe710 on helix 13, and Ile633, Val636 and Leu640 on helix 10.
- the amino acids involved in the binding of PB1 polypeptides in PA are also Trp706 of helix 13 and Gln670 of helix 11, among which the amino acids such as Val3 and N4 on Trp706 and PB1 short peptides pass through ⁇ or van der, Huali When interacting, Gln670 interacts with F9, V12, P13 and A14 of PB1 through hydrogen bonds, hydrophobic bonds and van der Waals forces, respectively.
- the T639 of the helix 10 participates in the role of Val3 (Van Dehuali;).
- Q408 and N412 on helix 4 participate in interaction with Val3, D2 of PB1.
- Another Bu Xi a loose loop interposed between helix 9 and 10 are also involved in the interaction with the PB 1, wherein 1621, G622, and E623 and the other points 1 J D2, N5 mesh interaction, and T618 and P620 respectively L8 K11 interaction.
- Spiral 8 is far away from PB1 polypeptide, mainly van der Waals force. This result is consistent with the literature's report that the residues on the PB1 polypeptide are involved in binding. To.
- K536 allelic mutants confirm the importance of these loci, suggesting that this large groove is involved in nucleotide or RNA binding.
- This polypeptide is formed by the interaction of the circular polypeptide segment with the surface of another adjacent molecule in crystal packing, and some amino acids are not seen. Clear electron cloud density.
- the large groove and the neck ring together form a large ring with a diameter of approximately 25 angstroms, which is sufficient to accommodate a double-stranded RNA helix.
- the surface at the inner groove of the ring is mainly A conservative basic amino acid is distributed, and the amino acids in the chain segment are not highly conserved, but in the three types of influenza viruses, they are mainly composed of acidic amino acids.
- This groove in the PA molecule and this The conservation of the circular structure and the specificity of the structure suggest that they have an important role in the polymerase, making them together become a second drug target in addition to the PA-PB 1 binding region.
- RNA promoter binding ability From the structure analyzed by the inventors, the inventors obtained this large groove as a nucleotide or RNA binding site. Among them, the K539, ⁇ 538, and ⁇ 328 sites are very conserved among the three types of influenza viruses, and the present inventors believe that these amino acids are involved in binding to RNA nucleotides, especially to RNA. This indicates that the indole subunit plays an important role in binding promoter and RNA and in RNA synthesis. Between domain I and domain II, a channel having a diameter of about 8 angstroms to 15 angstroms is formed by the helix of domain I and the beta sheet of domain II (Figs. 8A and 8C).
- the present invention provides a polypeptide, protein, inorganic or organic compound that competes with influenza virus polymerase PB 1 for binding to PA C , wherein the acid sequence of the polypeptide or protein comprises a wild-type influenza virus polymerization.
- a polypeptide or a compound which can form a hydrophobic interaction with a corresponding amino acid at the carboxyl terminal of the PA can be used as a drug for inhibiting influenza virus.
- drug de novo design based on the structure of the target protein.
- LigBui lder program developed by Peking University's Luhua 4th Research Group has more than 700 registered users internationally. (Wang, RX; Gao, Y.; Lai, LH, LigBui lder: A mult i-purpose program for structure-based drug des ign. J. Mol . Mod. 2000, 6, 498 ), has been successfully applied
- the LigBuilder program is designed for high activity inhibitors. Column, Boehringer Ingelhe im ⁇ ' Pharmaceutical Company' J uses LigBui lder 1.
- R 1 -CH 3, -CH 2 CH 3
- R 2 -COCH 3 , -CH 2 COCH 3 , -CO, -OCH 2 CH 3
- R3 -CH 2 NH 2 , -CH 2 (NH 2 )CH 2 CH 3 , -CH 2 (NH 2 )CH 2 CH 2 CH; Predict Kd: 8 ⁇ 51 ⁇ 9 ⁇ 65 with PA "Mouth” Region Examples of combined molecules are as follows:
- R 2 -OH, -CO, -CONH 2 , -CONHCH 3 , COOH
- R 3 -COOH, -NH 2 , -C(NH 2 ) 2+
- R2 -CH 2 (OH) CH3 , -NHCH 3, -CH 2 OH, -CH 2 NH 2, -NH 2, -C (NH 2)
- R 3 -NH 2 , -C(NH 2 ) 2+ , -CH 2 OH, -CO, -CH 2 CO, -NHCO
- R 4 -OH, -OCH 3 ,
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Priority Applications (4)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009801056726A CN101970466A (zh) | 2008-02-22 | 2009-02-22 | 流感病毒聚合酶pac-pb1n复合体的晶体结构及其应用 |
| EP09712540A EP2277891A4 (en) | 2008-02-22 | 2009-02-22 | CRYSTALLINE STRUCTURE OF THE INFLUENZA VIRUS PAc-PB1N POLYMERASE COMPLEX AND USES THEREOF |
| JP2010547032A JP2011515074A (ja) | 2008-02-22 | 2009-02-22 | インフルエンザ・ウイルスpaの発現精製及びpaのn末端及びpaのc末端とpb1のn末端ポリペプチド複合体の結晶構造 |
| US12/918,603 US8143044B2 (en) | 2008-02-22 | 2009-02-22 | Crystal structure of the influenza virus polymerase PAC-PB1N complex and uses thereof |
Applications Claiming Priority (4)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200810100840 | 2008-02-22 | ||
| CN200810100840.X | 2008-02-22 | ||
| CN200810083994.2 | 2008-05-02 | ||
| CN2008100839942A CN101514335B (zh) | 2008-02-22 | 2008-05-02 | 流感病毒聚合酶亚基pa的表达纯化及pa氨基端及pa羧基端与pb1氨基端多肽复合体的晶体结构 |
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| Publication Number | Publication Date |
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| WO2009103243A1 true WO2009103243A1 (zh) | 2009-08-27 |
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| PCT/CN2009/070498 Ceased WO2009103243A1 (zh) | 2008-02-22 | 2009-02-22 | 流感病毒聚合酶pac-pb1n复合体的晶体结构及其应用 |
Country Status (5)
| Country | Link |
|---|---|
| US (1) | US8143044B2 (zh) |
| EP (1) | EP2277891A4 (zh) |
| JP (1) | JP2011515074A (zh) |
| CN (2) | CN101514335B (zh) |
| WO (1) | WO2009103243A1 (zh) |
Families Citing this family (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US8455229B2 (en) | 2008-07-02 | 2013-06-04 | University Of Tsukuba | RNA polymerase derived from influenza virus |
| US8569016B2 (en) | 2008-10-17 | 2013-10-29 | Public University Corporation Yokohama City University | Construction and crystallization of expression system for RNA polymerase PB1-PB2 protein derived from influenza virus |
| CN101792745B (zh) * | 2009-02-04 | 2014-09-17 | 中国科学院生物物理研究所 | 流感病毒聚合酶亚基pa氨基端多肽的表达纯化及pa氨基端多肽的晶体结构 |
| SG10201601365RA (en) * | 2010-03-16 | 2016-03-30 | European Molecular Biology Lab Embl | Fragments of the pa subunit of rna dependent rna polymerase from pandemic influenza virus a 2009 h1n1, and their use |
| CN102757950A (zh) * | 2011-04-25 | 2012-10-31 | 天津市国际生物医药联合研究院 | 超级细菌新德里金属依赖型β-内酰胺酶NDM-1的表达纯化及β-内酰胺酶NDM-1的晶体结构 |
| CN105002149B (zh) * | 2014-04-22 | 2018-04-06 | 中国科学院生物物理研究所 | 流感病毒rna聚合酶纯化或结晶的方法 |
| CN105018441A (zh) * | 2014-04-22 | 2015-11-04 | 中国科学院生物物理研究所 | 流感病毒rna聚合酶结晶的方法 |
| EP3481946A1 (en) * | 2016-07-07 | 2019-05-15 | The European Molecular Biology Laboratory | Viral polypeptide fragments that bind cellular pol ii c-terminal domain (ctd) and their uses |
| CN109810955A (zh) * | 2019-01-22 | 2019-05-28 | 复旦大学 | 非洲猪流感病毒dna连接酶的晶体及其制备方法和应用 |
| CN112662694A (zh) * | 2020-12-25 | 2021-04-16 | 康九生物科技(长春)有限公司 | 一种麦芽糖结合蛋白、麦芽糖结合蛋白表达载体、重组工程菌及其应用 |
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-
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- 2009-02-22 CN CN2009801056726A patent/CN101970466A/zh active Pending
- 2009-02-22 US US12/918,603 patent/US8143044B2/en not_active Expired - Fee Related
- 2009-02-22 WO PCT/CN2009/070498 patent/WO2009103243A1/zh not_active Ceased
- 2009-02-22 EP EP09712540A patent/EP2277891A4/en not_active Withdrawn
- 2009-02-22 JP JP2010547032A patent/JP2011515074A/ja active Pending
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Also Published As
| Publication number | Publication date |
|---|---|
| CN101514335B (zh) | 2013-04-17 |
| US20110131029A1 (en) | 2011-06-02 |
| CN101514335A (zh) | 2009-08-26 |
| EP2277891A4 (en) | 2012-09-05 |
| CN101970466A (zh) | 2011-02-09 |
| EP2277891A1 (en) | 2011-01-26 |
| US8143044B2 (en) | 2012-03-27 |
| JP2011515074A (ja) | 2011-05-19 |
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