JP2023506053A - クエン酸シンターゼの活性が弱化した新規な変異型ポリペプチド及びそれを用いたl-アミノ酸生産方法 - Google Patents
クエン酸シンターゼの活性が弱化した新規な変異型ポリペプチド及びそれを用いたl-アミノ酸生産方法 Download PDFInfo
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- C12N15/00—Mutation or genetic engineering; DNA or RNA concerning genetic engineering, vectors, e.g. plasmids, or their isolation, preparation or purification; Use of hosts therefor
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- C12N15/74—Vectors or expression systems specially adapted for prokaryotic hosts other than E. coli, e.g. Lactobacillus, Micromonospora
- C12N15/77—Vectors or expression systems specially adapted for prokaryotic hosts other than E. coli, e.g. Lactobacillus, Micromonospora for Corynebacterium; for Brevibacterium
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- C—CHEMISTRY; METALLURGY
- C12—BIOCHEMISTRY; BEER; SPIRITS; WINE; VINEGAR; MICROBIOLOGY; ENZYMOLOGY; MUTATION OR GENETIC ENGINEERING
- C12N—MICROORGANISMS OR ENZYMES; COMPOSITIONS THEREOF; PROPAGATING, PRESERVING, OR MAINTAINING MICROORGANISMS; MUTATION OR GENETIC ENGINEERING; CULTURE MEDIA
- C12N9/00—Enzymes; Proenzymes; Compositions thereof; Processes for preparing, activating, inhibiting, separating or purifying enzymes
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- C12N9/1025—Acyltransferases (2.3)
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- C—CHEMISTRY; METALLURGY
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Abstract
Description
本出願は、前記ポリヌクレオチドを含むベクターを提供する。
1-1.gltAを含むベクターの作製
クエン酸シンターゼ活性を有するgltA変異ライブラリーを作製するために、まずgltAの一部を含む組換えベクターを作製した。野生型gltAのアミノ酸配列及びヌクレオチド配列をそれぞれ配列番号1及び2に示す。コリネバクテリウム・グルタミカム(Corynebacterium glutamicun)野生株の染色体を鋳型とし、配列番号5及び6のプライマーを用いてPCRを行い、上記増幅産物をTOPOクローニングキット(Invitrogen)で大腸菌ベクターpCR2.1にクローニングしてpCR-gltAを得た。
実施例1-1で作製したベクターに基づいてgltA変異ライブラリーを作製した。ライブラリーは、エラープローン(error-prone)PCRキット(clontech Diversify(登録商標) PCR Random Mutagenesis Kit)を用いて作製した。変異が起こる条件で、配列番号5及び6をプライマーとしてPCR反応を行った。具体的には、1000bp当たり0~3つの変異が起こる条件で、94℃で30秒間予熱処理(pre-heating)し、その後94℃で30秒間、68℃で1分30秒間の過程を25サイクル行った。ここで、得られたPCR産物をメガプライマー(megaprimer,500~125ng)として、95℃で50秒間、60℃で50秒間、68℃で12分間の過程を25サイクル行い、その後DpnIで処理し、大腸菌DH5αに形質転換してカナマイシン(kanamycin)25mg/Lを含有するLB固体培地に塗抹した。形質転換したコロニー20種を選択してプラスミドを得て、ポリヌクレオチド配列を分析した結果、2変異/kbの頻度で異なる位置に変異が導入されたことが確認された。約20,000個の形質転換した大腸菌コロニーを採取してプラスミドを抽出した。これをpTOPO-gltA-ライブラリーと命名した。
実施例1-2で作製したpTOPO-gltA-ライブラリーをコリネバクテリウム・グルタミカム(Corynebacterium glutamicun)ATCC13032にエレクトロポレーションで形質転換し、その後カナマイシン25mg/Lを含有する栄養培地に塗抹して変異遺伝子が挿入された菌株10,000個のコロニーを確保し、各コロニーをATCC13032/pTOPO_gltA(mt)1~ATCC13032/pTOPO_gltA(mt)10000と命名した。
加圧殺菌した生産培地25mlと25ug/mlのカナマイシンを含有する250mlのコーナーバッフルフラスコに各コロニーを白金耳で接種し、その後30℃、200rpmで60時間振盪培養した。培養終了後に、高速液体クロマトグラフィー(HPLC,SHIMAZDU LC20A)を用いた方法によりロイシン生産量を測定し、野生型コリネバクテリウム・グルタミカム菌株に比べてロイシン生産能が最も向上した菌株1種を選択した。選択した菌株から生産されたロイシン濃度を表2に示す。
3-1.gltA変異を含む挿入ベクターの作製
実施例2で選択した変異を菌株に導入するために、挿入用ベクターを作製した。gltA(M312I)変異導入用ベクターの作製には、部位特異的突然変異誘発(Site directed mutagenesis)法を用いた。コリネバクテリウム・グルタミカム野生型の染色体を鋳型とし、配列番号9及び10のプライマー対、配列番号11及び12のプライマー対を用いてPCRを行った。PCRは、94℃で5分間の変性後、94℃で30秒間、55℃で30秒間、72℃で1分30秒間を30サイクル行い、次いで72℃で5分間の重合反応を行うものとした。その結果、得られた遺伝子断片をSmaI制限酵素で切断した線状のpDCベクターとインフュージョン(In-Fusion)酵素を用いてDNA断片間の末端15塩基の相同配列を結合させてクローニングし、312番目のアミノ酸であるメチオニンをイソロイシンに置換するベクターpDC-gltA(M312I)を作製した。
実施例3-1で作製したpDC-gltA(M312I)ベクターをATCC13032に形質転換し、相同性配列の組換えにより染色体上にベクターが挿入された菌株は、カナマイシン25mg/Lを含有する培地から選択した。選択した1次菌株にさらに2次交差(cross-over)を行い、目標遺伝子の変異が導入された菌株を選定した。最終的に形質転換した菌株にgltA遺伝子変異が導入されたか否かは、配列番号7及び8のプライマーを用いてPCRを行い、その後塩基配列を分析することにより、菌株に変異が導入されたことが確認された。作製された菌株をATCC13032_gltA_M312Iと命名した。
コリネバクテリウム属野生型の菌株は、ロイシンを生産したとしても極微量を生産するにすぎない。よって、ATCC13032由来のロイシン生産菌株を作製し、選択した変異を導入してロイシン生産能を確認する実験を行った。具体的な実験は次の通りである。
ATCC13032由来の高濃度のロイシン生産菌株を作製するために、イソプロピルリンゴ酸シンターゼ(isopropylmalate synthase,以下「IPMS」という)変異体を導入したCJL-8100菌株を作製した。当該変異は、IPMSをコードするleuA遺伝子の1673番目のヌクレオチドであるGがAに置換され、IPMSタンパク質の558番目のアミノ酸であるアルギニンがヒスチジンに置換される変異と、1682番目、1683番目のヌクレオチドであるGCがATに置換され、561番目のアミノ酸であるグリシンがアスパラギン酸に置換される変異とを含む。
ロイシン生産菌株であるCJL-8100を実施例3-1で作製したpDC-gltA(M312I)ベクターで形質転換し、相同性配列の組換えにより染色体上にベクターが挿入された菌株は、カナマイシン25mg/Lを含有する培地から選択した。選択した1次菌株にさらに2次交差を行い、目標遺伝子の変異が導入された菌株を選定した。最終的に形質転換した菌株にgltA遺伝子変異が導入されたか否かは、配列番号7及び8のプライマーを用いてPCRを行い、その後塩基配列を分析することにより、菌株にgltA変異が導入されたことが確認された。作製されたCJL8100_gltA_M312IをCA13-8104と命名し、ブダペスト条約上の国際寄託機関である韓国微生物保存センター(Korean CultureCenter of Microorganisms,KCCM)に2019年12月20日付けで寄託番号KCCM12649Pとして寄託した。
L-リシンを生産するコリネバクテリウム・グルタミカムに属する菌株においてもクエン酸シンターゼ活性変化の効果があることを確認するために、野生株に3種の変異[pyc(P458S),hom(V59A),lysC(T311I)]を導入し、L-リシン生産能を有するようになったコリネバクテリウム・グルタミカムCJ3P(非特許文献5)を対象に、実施例3と同様にgltA(M312I)変異が導入された菌株を作製した。前述したように作製した菌株をCJ3P::gltA(M312I)と命名した。次の方法で対照群であるCJ3P菌株とCJ3P::gltA(M312I)のリシン生産量を測定した。まず、種培地25mlを含有する250mlのコーナーバッフルフラスコに各菌株を接種し、30℃、200rpmで20時間振盪培養した。次に、生産培地24mlを含有する250mlのコーナーバッフルフラスコに1mlの種培養液を接種し、32℃、200rpmで72時間振盪培養した。前記種培地及び生産培地の組成は、それぞれ次の通りである。培養終了後に、HPLC(Waters 2478)を用いてL-リシンの濃度を測定した。それを表6に示す。
グルコース20g,ペプトン10g,酵母抽出物5g,尿素1.5g,KH2PO4 4g,K2HPO4 8g,MgSO4・7H2O 0.5g,ビオチン100μg,チアミンHCl 1000μg,パントテン酸カルシウム2000μg,ニコチンアミド2000μg(蒸留水1リットル中)
<生産培地(pH7.0)>
グルコース100g,(NH4)2SO4 40g,大豆タンパク質2.5g,コーンスティープソリッド(Corn Steep Solids)5g,尿素3g,KH2PO4 1g,MgSO4・7H2O 0.5g,ビオチン100μg,チアミン塩酸塩1000μg,パントテン酸カルシウム2000μg,ニコチンアミド3000μg,CaCO3 30g(蒸留水1リットル中)
ロイシンと同じく代表的な分枝鎖アミノ酸であるバリンに対しても選択した変異が効果を発揮するか否かを確認するために、コリネバクテリウム属バリン生産菌株KCCM11201P(特許文献2)にも選択した変異を導入してバリン生産能を確認する実験を行った。
7-1.L-イソロイシン生産菌株コリネバクテリウム・グルタミカムKCCM11248PからのgltA(M312I)ORF変異が導入されたL-イソロイシン菌株の作製及びL-イソロイシン生産能の評価
実施例4と同様に、L-イソロイシン生産菌株であるコリネバクテリウム・グルタミカムKCCM11248P(特許文献3)に実施例3-1で作製した組換えプラスミドpDC-gltA(M312I)を染色体上での相同組換えにより導入した菌株を作製し、KCCM11248P::gltA(M312I)と命名した。作製した菌株を次の方法で培養し、イソロイシン生産能を比較した。
グルコース20g,ペプトン10g,酵母抽出物5g,尿素1.5g,KH2PO4 4g,K2HPO4 8g,MgSO4・7H2O 0.5g,ビオチン100μg,チアミンHCl 1000μg,パントテン酸カルシウム2000μg,ニコチンアミド2000μg(蒸留水1リットル中)
<生産培地(pH7.0)>
グルコース50g,(NH4)2SO4 12.5g,大豆タンパク質2.5g,コーンスティープソリッド(Corn Steep Solids)5g,尿素3g,KH2PO4 1g,MgSO4・7H2O 0.5g,ビオチン100μg,チアミン塩酸塩1000μg,パントテン酸カルシウム2000μg,ニコチンアミド3000μg,CaCO3 30g(蒸留水1リットル中)
培養終了後に、HPLCによりL-イソロイシンの生産能を測定した。実験を行った各菌株における培養液中のL-イソロイシン濃度を表8に示す。
gltA(M312I)変異導入がL-イソロイシン生産能に及ぼす効果を確認するために、コリネバクテリウム・グルタミカムATCC13032(以下、WT)菌株をベースにlysC(L377K)変異体(特許文献5)とhom(R407H)変異体(特許文献4)を導入して菌株を作製し、公知のトレオニンデヒドラターゼ(L-threonine dehydratase)をコードする遺伝子にilvA(V323A)変異(非特許文献6)を導入してL-イソロイシン生産能を比較した。
gltA(M312I)変異導入によりO-アセチル-ホモセリンの生産に及ぼす影響を把握するために、O-アセチル-ホモセリン分解経路であるシスタチオニンγ-シンターゼをコードするmetB遺伝子とO-アセチルホモセリン(チオール)-リアーゼをコードするmetY遺伝子を欠損させ、O-アセチル-ホモセリン生合成を増大させるべく、アスパルトキナーゼをコードするlysC遺伝子(配列番号11)に、lysC遺伝子のL-リシン(L-Lysine)及びL-トレオニン(L-Threonine)に対するフィードバック阻害解除のための変異(L377K)(特許文献4)を導入してO-アセチル-ホモセリン生産菌株を作製した。
グルコース30g,KH2PO4 2g,尿素3g,(NH4)2SO4 40g,ペプトン2.5g,CSL(Sigma)5g(10ml),MgSO4・7H2O 0.5g,メチオニン400mg,CaCO3 20g(蒸留水1リットル中)
Claims (14)
- 配列番号1のアミノ酸配列からなるポリペプチドのN末端から312番目の位置に相当するアミノ酸が他のアミノ酸に置換された、クエン酸シンターゼ(citrate synthase)活性を有する変異型ポリペプチド。
- 前記312番目の位置に相当するアミノ酸がイソロイシン(isoleucine)に置換された、請求項1に記載の変異型ポリペプチド。
- 前記変異型ポリペプチドは、配列番号1のアミノ酸配列と80%以上、100%未満の配列相同性を有する、請求項1に記載の変異型ポリペプチド。
- 前記変異型ポリペプチドは、配列番号3のアミノ酸配列からなるものである、請求項1に記載の変異型ポリペプチド。
- 請求項1~4のいずれか一項に記載の変異型ポリペプチドをコードするポリヌクレオチド。
- 請求項5に記載のポリヌクレオチドを含むベクター。
- 請求項1~4のいずれか一項に記載の変異型ポリペプチド、前記変異型ポリペプチドをコードするポリヌクレオチド、又は前記ポリヌクレオチドを含むベクターを含む、L-アミノ酸を生産する微生物。
- 前記L-アミノ酸は、ロイシン、リシン、バリン、イソロイシン及びO-アセチルホモセリンからなる群から選択される少なくとも1つである、請求項7に記載の微生物。
- 前記微生物は、コリネバクテリウム属(Corynebacterium sp.)である、請求項7に記載のL-アミノ酸を生産する微生物。
- 前記コリネバクテリウム属微生物は、コリネバクテリウム・グルタミカム(Corynebacterium glutamicum)である、請求項9に記載のL-アミノ酸を生産する微生物。
- 請求項1~4のいずれか一項に記載の変異型ポリペプチド、前記変異型ポリペプチドをコードするポリヌクレオチド、又は前記ポリヌクレオチドを含むベクターを含む微生物を培地で培養するステップを含むL-アミノ酸生産方法。
- 前記方法は、培養した培地又は微生物からL-アミノ酸を回収するステップをさらに含む、請求項11に記載のL-アミノ酸生産方法。
- 前記L-アミノ酸は、ロイシン、リシン、バリン、イソロイシン及びO-アセチルホモセリンからなる群から選択される少なくとも1つである、請求項12に記載のL-アミノ酸生産方法。
- 配列番号1のアミノ酸配列からなるポリペプチドのN末端から312番目の位置に相当するアミノ酸が他のアミノ酸に置換された、クエン酸シンターゼ活性を有する変異型ポリペプチド、前記変異型ポリペプチドをコードするポリヌクレオチド、又は前記ポリヌクレオチドを含むベクターを含む、L-アミノ酸を生産する微生物のL-アミノ酸生産における使用。
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AR120149A1 (es) | 2022-02-02 |
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ZA202206108B (en) | 2023-04-26 |
CA3163266A1 (en) | 2021-08-05 |
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