JP5594898B2 - 性質が変えられたグルコアミラーゼ変異種 - Google Patents
性質が変えられたグルコアミラーゼ変異種 Download PDFInfo
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- JP5594898B2 JP5594898B2 JP2010528857A JP2010528857A JP5594898B2 JP 5594898 B2 JP5594898 B2 JP 5594898B2 JP 2010528857 A JP2010528857 A JP 2010528857A JP 2010528857 A JP2010528857 A JP 2010528857A JP 5594898 B2 JP5594898 B2 JP 5594898B2
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- glucoamylase
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Description
本出願は2007年10月9日出願の国際特許出願PCT/US/21683基づく優先権を主張する。国際特許出願PCT/US/21683は、2006年10月10日出願の米国仮特許出願60/850,431に基づく優先権を主張している。両出願の内容はその全部を引用により本明細書に組み入れられる。
本発明は性質が変更された(例.熱安定性及び/又は特異的活性の改善)親グルコアミラーゼの変異種に関する。特に、本発明は、デンプン加水分解性組成物、動物飼料組成物及び洗浄剤組成物等の、このグルコアミラーゼ変異種を含む組成物を提供する。本発明はまた、この変異種をコードするDNA構造体と宿主細胞にこのグルコアミラーゼ変異種を産生する方法に関連する。
グルコアミラーゼ酵素は(グルカン1,4-α-グルコヒドロラーゼ、EC3.2.1.3)は、デンプン加水分解エキソ型炭水化物分解酵素であり、デンプン又は関連するオリゴ糖及び多糖分子の非還元性末端から、連続するグルコース単位の切断を触媒する。グルコアミラーゼはデンプンの直鎖の及び分岐したグルコースの結合(例.アミロースとアミロペクチン)の両者を加水分解できる。
ある面では、本発明は、次の残基の位置に対応する位置で1以上のアミノ酸置換をもつ単離されたグルコアミラーゼ変異種に関する。即ち、SEQ ID NO:2又はSEQ ID NO:3の10,14,15,23,42,45,46,59,60,61,67,68,72,73,97,98,99,102,108,110,113,114,122,124,125,133,140,144,145,147,152,153,164,175,182,204,205,214,216,219,228,229,230,231,236,239,240,241,242,244,263,264,265,268,269,276,284,291,300,301,303,310,311,313,316,338,342,344,346,349,359,361,364,379,382,390,391,393,394,408,410,415,417,418,430,431,433,436,442,443,444,448及び451又は親グルコアミラーゼの同等の位置である。いくつかの実施態様では、親グルコアミラーゼはSEQID NO :1,4,5,6,7,8又は9の配列を含む。いくつかの実施態様では、親グルコアミラーゼはトリコデルマ属の種、アスペルギルス属の種、フミコラ属の種、ペニシリウム属の種、タラロマイセス属の種又はシゾサッカリマイセス属の種から得られる。さらに別の実施態様では、親の同等の位置は配列の同定により決定される。他の実施態様では、親グルコアミラーゼは、SEQID NO:2と少なくとも80%配列が同じである。別の実施態様では、親株での同等の位置はSEQID NO2又は3との構造的な一致により決定される。この面のさらに別の実施態様では、この変異種は以下から選ばれた位置で置換されている。
即ち、SEQ ID:ID2又はSEQIDNO:3のT10D/F/G/K/L/M/P/R/S; L14E/H;N15D/N;P23A/G; F59A/G;K60F/H;N61D/I/L/Q/V/W;R65A/C/G/I/K/M/S/V/Y;T67C/I/K/M/T;E68I/M/W; A72E/G/L/M/Q/R/W/Y;G73C/L/W;S97F/M/N/P/R/S/V/W/Y;L98H/M;A99C/L/M/N/P;S102A/C/I/L/M/N/R/V/W/Y;E110Q/S/W;L113E/N;K114C/D/E/L/M/Q/S/T/V;I133K/R/S/T;
S444/M/N/P/Q/R/T/V/W;T448F/G/I/P/Q/T/V;及びS541E/H/K/L/Q/T、または親グルコアミラーゼの同等の位置である。
364,379,382,390,391,393,394,408,410,415,417,418,430,431,433,436,442,443,444,448及び451である。この面の別の実施態様では、このグルコアミラーゼ変異種はSEQIDNO:2又はSEQIDNO:3の61,67,72,97,102,133,205,219,228,230,231,239,263,268,291,342, 394,430,431及び451に対応する位置で1以上のアミノ酸置換を含む。この面のさらに別の実施態様では、このグルコアミラーゼ変異種は以下のうち少なくとも1個に対応する1以上のアミノ酸置換を受けている。即ち、SEQIDNO:2又はSEQIDNO:3のT67M,A72Y,S97N, S102M,I133T,T205Q,Q219S,W228M,S230F,S230G,S230N,S230R,S231L,I239V,I239Y, N263P,A268C,A268G,A268K,S291A,T342V,K394S,T430K,A431Q,S451Kである。
451である。
444,448及び451である。この面の他の実施態様では、本発明のこのグルコアミラーゼ変異種は、以下から選ばれた位置に対応する1以上のアミノ酸置換を含む。即ち、SEQID:NO2又はSEQIDNO:3の10,42,68,73,97,114,153,229,231,236,264,291,301,344,361,364,417,及び433である。この面のさらに別の実施態様では、このグルコアミラーゼ変異種は以下から選ばれた位置に対応する1以上のアミノ酸置換を含む。即ち、SEQIDNO:2又はSEQIDNO:3の68,73,114,153,236,344,361,364及び433である。この面のさらにいくつかの実施態様では、このグルコアミラーゼ変異種は以下のうち少なくとも1つに対応する1以上のアミノ酸置換を含む。即ち、SEQID NO:2又はSEQIDNO:3のT10S、T42V、E68C、E68M、G73F、G73W、K114M、K114T、N153A、N153S、N153V、W228V、D236R、G361D、G361E、G361P、G361Y、A364D、A364E、A364F、A364G、A364K、A365L、A365R、R433C、R433G、R433L、R433N、R433S、R433V及びI436Hである。
詳細な実施態様
親グルコアミラーゼ
グルコアミラーゼの構造的同一性
変異種
いくつかの実施態様では、この変異種は図5Aと5Bに示されているような非保存性アミノ酸の領域に対応する位置で少なくとも1個のアミノ酸の位置に置換を含む。
379,382,390,391,393,394,408,410,415,417,418,430,431,433,436,442,443,444,448及び451または親グルコアミラーゼの同等の位置。いくつかの実施態様では、親グルコアミラーゼSEQ ID NO:2またはSEQ ID NO:3と少なくとも50%同一、少なくとも60%同一、少なくとも70%同一、少なくとも80%同一、少なくとも90%同一、少なくとも95%同一、少なくとも96%同一、少なくとも97%同一、少なくとも98%同一、少なくとも99%同一の配列をもつ。他の実施態様では、親グルコアミラーゼはトリコデルマグルコアミラーゼ相同体である。いくつかの実施態様では変異種は性質が変えられている。いくつかの実施態様では、親グルコアミラーゼはSEQ ID NO:2または3のグルコアミラーゼと構造的な同一性がある。
T430,A431,R433,I436,A442,N443,S444,T448及びS451または親グルコアミラーゼの同等の位置(例トリコデルマグルコアミラーゼ相同体)。いくつかの実施態様では、この変異種は親グルコアミラーゼと比較して性質が変えられている。
及びS451E/H/K/L/Q/Tまたは親グルコアミラーゼの同等の位置の置換。
448及び451または親グルコアミラーゼ(例.トリコデルマグルコアミラーゼ相同体)の同等の位置。いくつかの実施態様では、親グルコアミラーゼはSEQIDNO:2またはSEQIDNO:3と少なくとも50%、少なくとも60%、少なくとも70%、少なくとも80%、少なくとも90%、少なくとも95%、少なくとも96%、少なくとも97%、少なくとも98%、少なくとも99%同一の配列をもつ。いくつかの実施態様では、親グルコアミラーゼはまた、SEQIDNO:2または3のグルコアミラーゼと構造的同一性も示す。他の実施態様では、親グルコアミラーゼはトリコデルマグルコアミラーゼ相同体である。いくつかの実施態様では、この変異種は以下の位置の一つに対応する1以上の置換をもつ。SEQID:NO:2及び/または3の10、42、68、73、97、114、153、229、231、236、264、291、301、344、361、364、375、417、及び433。いくつかの実施態様では、これらの位置での置換は、SEQIDNO:2及び/または3のT10S、T42V、E68C、E68M、G73F、G73W、K114M、K114T、N153A、N153S、N153V、W228V、D236R、G361D、G361E、G361P、G361Y、A364D、A364E、A364F、A364G、A364K、A365L、A365R、R433C、R433L、R433N、R433S、R433V、及びI436Hから選ばれる。いくつかの実施態様では、この変異種は以下の位置の1つに対応する1以上の置換を有する。:SEQID NO:2及び/または3の42,68,73,114,153,236,361及び364。いくつかの実施態様では、これらの位置での置換は、SEQIDNO:2及び/または3のT42V、E68M、G73F、G73W、K114T、N153S、N153V、D236R、G361D、A364F及びA364Lから選ばれる。いくつかの実施態様では、この変異種は少なくとも1つの変異した性質をもち、この少なくとも1つの変異した性質は親グルコアミラーゼと比較して熱安定性の増大である。
430、431、433、444、448、及び451及び/または親グルコアミラーゼの同等の位置(例.トリコデルマグルコアミラーゼ相同体)。いくつかの実施態様では、親グルコアミラーゼはSEQID:2またはSEQIDNO:3と少なくとも50%、少なくとも60%、少なくとも70%、少なくとも80%、少なくとも90%、少なくとも95%、少なくとも96%、少なくとも97%、少なくとも98%、及び少なくとも99%の配列の同一性をもつ。いくつかの実施態様では、親グルコアミラーゼは、またSEQID No:2及び/または3のグルコアミラーゼと構造的同一性ももつ。他の実施態様では、親グルコアミラーゼはトリコデルマグルコアミラーゼ相同体である。いくつかの実施態様では、変異種は親グルコアミラーゼと比較して少なくとも1個の変異した性質をもつ。いくつかの実施態様では、この変異種はSEQID NO2及び/または3の以下の位置:228,230,231,268,291,417,433及び451のうち対応する1箇所に対応する1以上の置換を受けている。いくつかの実施態様では、これらの位置での置換は、SEQID:2又は3のW228H, W228M, S230F, S230G, S230R, S231L, A268C, A268G, S291A, L417R, R433Y,及びS451Kから選ばれる。いくつかの実施態様では、この変異種は、少なくとも1個の変異した性質を有し、この少なくとも1個の変異した性質は親グルコアミラーゼと比較して熱安定性又は特異的活性の増大である。いくつかの実施態様では、この変異種は親グルコアミラーゼと比較して熱安定性と特異的活性の両者が増大している。
変異された性質
熱的安定性(熱的に安定な変異種)
を含む、親株よりも少なくとも1%乃至少なくとも50%以上大きい残存活性(NaAc 緩衝液、pH4.5、64℃で1時間保温後)を有する。例えば、親株の残存活性が15%のとき、熱安定性が増大している変異種は約16%乃至約75%の残存活性を有しうる。いくつかの実施態様では、このグルコアミラーゼ変異種は、例えば、少なくとも60分、120分、180分、240分、300分などの、所与の期間にわたり、温度を変えて暴露した後、少なくとも50%、60%、70%、75%、80%、85%、90%、92%、95%、96%、97%、98%又は99%の酵素活性を保持するような改善された熱安定性を有する。いくつかの実施態様では、この変異種は40から80℃の範囲、また50から75℃の範囲、60から70℃の範囲の選択された温度と4.0から6.0のpHの範囲で、親グルコアミラーゼと比較して熱安定性が増大する。いくつかの実施態様では、熱安定性は実施例で述べられているように決定される。いくつかの実施態様では、変異種は35℃から45℃及び30℃から40℃等の20℃から50℃の範囲で選ばれた温度で親グルコアミラーゼと比較して比較的低温で熱安定性が増大している。
特異的活性
熱安定性と特異的活性の組み合わせ
ポリヌクレオチド
DNA構造体とベクター
宿主細胞
バシルス属は分類学上の再分類を受けて続けていることが知られている。従って、この属は、現在「ジオバシルス・ステアロテルモフィルス」と名づけられている、B・ステアロテルモフィルスのような生物を非限定的に含む、再分類されている種を含むことが意図されている。
宿主細胞の形質転換
タンパク質の産生
組成物
用途
以下の開示と実験項では、以下の略号が使用される。GA(グルコアミラーゼ);GAU(グルコアミラーゼ単位);wt%(重量パーセント);℃(摂氏);rpm(毎分回転数);H2O(水)、d H2O(脱イオン水);dI H2O(脱イオン水、ミリ-Qろ過);aaまたはAA(アミノ酸);bp(塩基対);kb(キロ塩基対);kD(キロダルトン);gまたはgm(グラム);μg(マイクログラム);mg(ミリグラム);μL(マイクロリットル);mlとmL(ミリリットル);mm(ミリメートル);μm(マイクロメートル);M(モル);mM(ミリモル);μM(マイクロモル);U(単位);V(ボルト);MW(分子量);sec または s(s)(秒);min(s)またはm(s)(分);hr(s)またはh(s)(時間)、DO(溶存酸素);ABS(吸光度);EtOH(エタノール);PSS(生理的塩溶液);m/v(質量/容量);及びMTP(マイクロタイタープレート);N(規定);DP1(単糖);DP2(二糖);DP>3(3より大きい重合度をもつオリゴ糖、糖);ppm(百万分の一)
96孔ミクロタイタープレート用pNPGグルコアミラーゼ活性定量法
熱安定性の測定
(ABS(340) 残存−.ブランクテスト)/(ABS(340)初期−ブランクテスト) X 100%
キャリパー(Caliper)によるタンパク質の量決定
ヘキソキナーゼ活性定量
定量条件 エタノールスクリーニング定量:
実施例
実施例1.トリコデルマ・レセイでの発現用pTTTベクター中のTrGA部位評価ライブラリー(SEL)の構築。
表2-TrGA SELの生成に使用されたプライマー
F=フォワードプライマー、R=リバースプライマー
実施例2;TrGA SELによるトリコデルマ・レセイの形質転換
1)プロトプラスト調製のため、芽胞は、トリコデルマ最小培地(MM)(20g/Lグルコース、15g/L KH2PO4、pH4.5、5g/L(NH4)2SO4、0.6g/LMgSO4 x7H2O、0.6g/LCaCl2x2H2O、1mlの1000X T・レセイ微小元素溶液{5g/L FeSO4X7H2O、1.4g/L ZnSO4 x7H2O、1.6g/L MnSO4 xH2O、3.7g/L CoCl2X6H2O })で24℃で16-24時間、150rpmの振とうにより増殖された。発芽した芽胞は遠心分離により集められ、菌類の細胞壁を分解するため15mg/mlのβ-D-グルカナーゼ-G(Interspex-Art.No.0439-1)溶液により処理された。プロトプラストのその後の処理はPenttilaら(1987上記)に述べられたように、標準的方法により行われた。2)形質転換法は10分の1に小さくされた。一般に、総容量25μl中に600ngのDNAと1-5x105個のプロトプラストまで含む形質転換混合物は200mlの25%PEG溶液で処理され、2倍容量の1.2Mソルビトール溶液で稀釈され、アセトアミドを含む3%の選択的トップアガロースMM(上記と同一の最小培地であるが、(NH4)2SO4は20mMアセトアミドで置き換えられていた。)と混合され、24孔のマイクロタイタープレート又は、48に仕切られた20x20cm Q-トレー中の、アセトアミドを含む2%選択的アガロースに注がれた。このプレートは28℃で8日間保温された。各孔で再形成された形質転換体の総ての芽胞は0.85%NaCl、0.015% Tween80の溶液を使用してこのプレートから集められた。芽胞の懸濁液が96孔のMTP中で培養するために加えられた。24孔のMTPの場合、芽胞数を増やすために、選択的アセトアミドMMを含む新たな24孔MTPでのプレーティング段階を追加した。
実施例3:MTPにおけるTrGA変異種を発現しているT・レセイ形質転換体の発酵
実施例4:GA-産生形質転換体の全成分液体培地の調製
実施例5:熱安定性が改良された変異種
表3は試験を受けたとき、親グルコアミラーゼより大きい性能指数を示した変異種を含む。これらは、以下の部位を含んでいた。10,42,59,60,61,68,72,73,97,98,99,102,114,133,140, 144,147,152,153,164,182,204,205,214,216,228,229,230,231,241,242,263,264,265,268,269,276,284,291,300,301,303,311,338,342,344,346,349,359,361,364,375,379,382,390,391,393,394,410,417,430,431,433,436,442,443,444,448及び451。最大の増大を示す置換のあった部位は、T10S、T42V、E68C、E68M、G73F、G73W、K114M、K114T、I133V、N153A、N153S、N153V、W228V、V229I、V229L、S231V、D236R、L264D、S291M、S291T、A301P、A301R、S344M、S344P、S344Q、S344V、G361D、G361E、G361F、G361L、G361M、G361P、G361S、G361W、G361Y、A364D、A364E、A364F、A364G、A364K、A364L、A354R、A364S、A364V、A364W、T375N、R433C、R433G、R433N、R433S、R433V及びI436Hを含む。
実施例6:エタノールスクリーニング定量で改良された特異的活性(SA)をもつ変異種
実施例7:特異的活性と熱安定性を併せて有する変異種
表5:両活性が向上した変異種
実施例8:TrGAの結晶構造
実施例9:TrGAとアスペルギルスアワモリGAの間の相同性
Claims (10)
- SEQ ID NO:2又は3からなるアミノ酸配列を含み、以下の群より選択される1以上のアミノ酸置換を含む単離されたグルコアミラーゼ変異種:
T010F:T010G:T010M:T010R:T010S:F059A:A059G:N061V:E068I:E068M:E068W:A072E:A072Q:G073W:S097V:A099C:A099L:S102A:K140Q:K140S:K140W:N153D:N153L:N153W:N182R:A204D:A204M:T205D:T205N:T205P:T205S:T205V:T205Y:S214T:W228A:W228F:W228G:W228H:W228I:W228L:W228M:W228T:V229E:V229I:V229M:V229N:V229Q:S230C:S230D:S230E:S230F:S230G:S230H:S230K:S230L:S230N:S230P:S230Q:S230R:S230T:S230V:S230Y:S231C:S231D:S231F:S231L:S231M:S231N:S231Q:S231R:S231V:S231Y:D236F:D236G:D236L:D236M:D236N:D236P:D236T:D236V:T241V:N242F:L264A:G265E:G265H:G265I:G265K:G265R:G265T:A268C:A268D:A268E:A268F:A268G:A268I:A268K:A268L:A268P:A268R:A268T:A268W:D276S:V284R:V284T:V284Y:S291A:S291E:S291F:S291H:S291K:S291N:S291P:S291W:P300R:A301K:A301L:A301P:A301S:A301W:A303I:A303L:A311S:A311Y:V338P:V338Q:V338S:V338Y:S344A:S344T:S346M:T346N:T346P:T346Q:T346Y:A349L:V359Q:V359R:G361H:G361L:G361R:A364M:A364W:T375E:T375H:T375V:T375W:T375Y:N379A:N379C:N379D:N379G:N379I:N379M:N379P:S382A:S382N:S382P:E391L:E391R:E391W:E391Y:A393E:A393G:A393H:A3931:A393K:A393L:A393M:A393N:A393Q:A393R:A393S:A393T:A393V:A393W:A393Y:K394A:K394H:K394L:K394M:K394Q:K394R:K394T:K394V:S410E:S410H:S410N:L417I:L417K:L417Q:L417R:L417V:L417Y:T430A:T430E:T430F:T430H:T430I:T430K:T430M:T430N:T430Q:T430R:T430V:A431I:A431R:R433A:R433M:R433W:R433Y:S444K:S444M:S444Q:T448F:T448I:T448Q:T448V:S451K。 - 請求項1に記載の変異種をコードするポリヌクレオチド。
- 請求項2のポリヌクレオチドを含む宿主細胞。
- 請求項1に記載のグルコアミラーゼ変異種を含む酵素組成物。
- 請求項4の酵素組成物であってさらにアルファアミラーゼを含む酵素組成物。
- 請求項4の酵素組成物であって、前記組成物はデンプン変換法で使用される酵素組成物。
- 請求項4の酵素組成物であって、前記組成物は動物飼料調合物で使用される酵素組成物。
- 請求項4の酵素組成物であって、前記組成物はアルコール発酵法で使用される酵素組成物。
- 請求項2のポリヌクレオチドを含むDNA構造体により宿主細胞を形質転換し、前記グルコアミラーゼ変異種を発現させ、産生させるために適した条件で当該宿主細胞を培養し、前記変異種を産生させることを含む、宿主細胞において変異グルコアミラーゼを産生する方法。
- 請求項9の方法であってさらに前記培地から当該グルコアミラーゼを回収することを含む方法。
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| PCT/US2007/021683 WO2008045489A2 (en) | 2006-10-10 | 2007-10-09 | Glucoamylase variants with altered properties |
| USPCT/US2007/021683 | 2007-10-09 | ||
| PCT/US2008/004574 WO2009048488A1 (en) | 2007-10-09 | 2008-04-08 | Glucoamylase variants with altered properties |
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| JP5594898B2 true JP5594898B2 (ja) | 2014-09-24 |
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| JP2010528857A Expired - Fee Related JP5594898B2 (ja) | 2007-10-09 | 2008-04-08 | 性質が変えられたグルコアミラーゼ変異種 |
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