JP2023503415A - 内膜タンパク質の変異体及びそれを用いた目的産物生産方法 - Google Patents
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Abstract
Description
コリネバクテリウム染色体への遺伝子の挿入及び置換のためのプラスミド(pDCM2,図1,配列番号37)を設計し、バイニックス(株)の遺伝子合成(Gene-synthesis)サービスを用いてプラスミドを合成した。一般に知られているsacB系に関する論文[非特許文献15]を参考にして、クローニングに活用することが容易な制限酵素(restriction enzyme)を含むようにプラスミドを設計した。このように合成したpDCM2プラスミドは、次のような特性を有する。
2-1.外来膜タンパク質(YjeH)及び変異型YjeH導入菌株の作製
コリネバクテリウム・グルタミカム(Corynebacterium glutamicum)ATCC13032に導入する外来膜タンパク質であってO-アセチルホモセリン排出タンパク質であるYjeHの有効性を判断するために、大腸菌由来のYjeHをコードするyjeH遺伝子(配列番号2)を含む染色体導入ベクターを作製した。
実施例2-1で作製したATCC13032ΔNCgl2335、ATCC13032ΔNCgl2335::PCJ7-yjeH(eco,WT)、ATCC13032ΔNCgl2335::PCJ7-yjeH(eco,F92N)、ATCC13032ΔNCgl2335::PCJ7-yjeH(eco,F351L)と野生型菌株であるATCC13032のO-アセチルホモセリン(O-AH; O-Acetyl Homoserine)生産能を比較するために、次の方法で培養し、培養液中のO-アセチルホモセリンを分析した。
O-アセチルホモセリン生産培地(pH7.2)
グルコース30g,KH2PO4 2g,尿素(Urea)3g,(NH4)2SO4 40g,ペプトン(Peptone)2.5g,CSL(Corn steep liquor, Sigma)5g(10ml),MgSO4・7H2O 0.5g,CaCO3 20g(蒸留水1リットル中)
実施例2-1で作製したATCC13032ΔNCgl2335、ATCC13032ΔNCgl2335::PCJ7-yjeH(eco,WT)、ATCC13032ΔNCgl2335::PCJ7-yjeH(eco,F92N)、ATCC13032ΔNCgl2335::PCJ7-yjeH(eco,F351L)と野生型菌株であるATCC13032のホモセリン(Homoserine)生産能を比較するために、次の方法で培養し、培養液中のホモセリンを分析した。
ホモセリン生産培地(pH7.2)
グルコース30g,KH2PO4 2g,尿素(Urea)3g,(NH4)2SO4 40g,ペプトン(Peptone)2.5g,CSL(Corn steep liquor, Sigma)5g(10ml),MgSO4・7H2O 0.5g,CaCO3 20g(蒸留水1リットル中)
3-1.シスタチオニンγ-シンターゼ(MetB)の不活性
コリネバクテリウム・グルタミカムATCC13032の染色体DNAを鋳型としたPCRにより、O-アセチルホモセリン分解経路のシスタチオニンγ-シンターゼ(cystathionine gamma(γ)-synthase)をコードするmetB遺伝子を確保した。米国国立衛生研究所の遺伝子バンク(NIH GenBank)からmetB遺伝子の塩基配列情報(NCBI登録番号Ncgl2360,配列番号17)を確保し、それに基づいてmetB遺伝子のN末端部分とリンカー部分を含むプライマー(配列番号18及び19)、C末端部分とリンカー部分を含むプライマー(配列番号20及び21)を合成した。プライマー配列を表6に示す。
コリネバクテリウム・グルタミカムATCC13032の染色体DNAを鋳型としたPCRにより、O-アセチルホモセリン分解経路のO-アセチルホモセリンチオールリアーゼ(O-acetylhomoserine(thiol)-lyase)をコードするmetY遺伝子を確保した。米国国立衛生研究所の遺伝子バンク(NIH GenBank)からmetY遺伝子の塩基配列情報(NCBI登録番号Ncgl0625,配列番号22)を確保し、それに基づいてmetY遺伝子のN末端部分とリンカー部分を含むプライマー(配列番号23及び24)、C末端部分とリンカー部分を含むプライマー(配列番号25及び26)を合成した。プライマー配列を表7に示す。
O-アセチルホモセリン生成の最大化のために、コリネバクテリウム・グルタミカムATCC13032由来のアスパルトキナーゼをコードするlysC遺伝子(配列番号27)にlysC遺伝子の発現強化と、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7)を導入し、前記変異型lysC遺伝子を含むベクターを作製するために、変異位置を中心に、5’末端上流を増幅するためのプライマー1対(配列番号28及び29)と、3’末端下流を増幅するためのプライマー1対(配列番号30及び31)を設計した。配列番号28及び31のプライマーは各末端にXbaI、SalI制限酵素部位を挿入し、配列番号29及び30のプライマーは交差するように設計し、その部位にヌクレオチド置換変異が位置するようにした。プライマー配列を表8に示す。
O-アセチルホモセリントランスフェラーゼ(MetX)をコードする遺伝子を増幅するために、米国国立衛生研究所の遺伝子バンク(NIH GenBank)からmetX遺伝子の塩基配列情報(NCBI登録番号NCgl0624,配列番号32)を確保し、それに基づいてプロモーター部位(開始コドンの上流約300bp)からターミネーター部位(終結コドンの下流約100bp)までを増幅するためのプライマー(配列番号33及び34)の両末端にBamHI制限酵素部位を挿入して設計した。PCR条件は、95℃で5分間の変性後、95℃で30秒間の変性、55℃で30秒間のアニーリング、72℃で90秒間の重合を30サイクル行い、次いで72℃で7分間の重合反応を行うものとした。その結果、metX遺伝子のコード部位1546bpのDNA断片が得られた。pECCG117(特許文献8)ベクターとmetX DNA断片を制限酵素BamHIで処理し、DNAライゲーション酵素を用いて連結し、その後クローニングすることによりプラスミドを得た。これをpECCG117-metX WTと命名した。プライマー配列を表9に示す。
実施例3-4で作製したpECCG117-metX WTベクターを実施例3-3で作製したコリネバクテリウム・グルタミカムATCC13032△metB△metY lysC(L377K)に電気パルス法で導入し、その後カナマイシン(kanamycin)25mg/Lを含有する選択培地に塗抹し、それぞれの形質転換株を得た。
O-アセチルホモセリン生産培地(pH7.2)
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)
実施例3-4で作製したpECCG117-metX WTベクターを実施例3-3で作製したコリネバクテリウム・グルタミカムATCC13032△metB△metY lysC(L377K)に電気パルス法で導入し、その後カナマイシン(kanamycin)25mg/Lを含有する選択培地に塗抹し、それぞれの形質転換株を得た。
ホモセリン生産培地(pH7.2)
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)
4-1.変異型外来膜タンパク質(YjeH)の導入
実施例2-1で作製したベクターpDCM2-△NCgl2335、pDCM2-△NCgl2335::PCJ7-yjeH(eco,WT)、pDCM2-△NCgl2335::PCJ7-yjeH(eco,F92N)、pDCM2-△NCgl2335::PCJ7-yjeH(eco,F351L)を実施例3-3で作製したコリネバクテリウム・グルタミカムATCC13032△metB△metY lysC(L377K)菌株に形質転換し、2次交差過程を経て、染色体上でトランスポザーゼであるNCgl2335遺伝子が欠損したATCC13032△metB△metY lysC(L377K)△NCgl2335、ATCC13032△metB△metY lysC(L377K)△NCgl2335::PCJ7-yjeH(eco,WT)、ATCC13032△metB△metY lysC(L377K)△NCgl2335::PCJ7-yjeH(eco,F92N)、ATCC13032△metB△metY lysC(L377K)△NCgl2335::PCJ7-yjeH(eco,F351L)を得た。不活性化されたNCgl2335遺伝子と、新たに導入された大腸菌yjeH遺伝子が挿入されたか否かは、配列番号4及び7のプライマーを用いてPCRを行い、その後NCgl2335遺伝子が不活性化されていないATCC13032と比較して最終確認した。
実施例3-4で作製したpECCG117-metX WTベクターを実施例4-1で作製したATCC13032△metB△metY lysC(L377K)△NCgl2335、ATCC13032△metB△metY lysC(L377K)△NCgl2335::PCJ7-yjeH(eco,WT)、ATCC13032△metB△metY lysC(L377K)△NCgl2335::PCJ7-yjeH(eco,F92N)、ATCC13032△metB△metY lysC(L377K)△NCgl2335::PCJ7-yjeH(eco,F351L)に電気パルス法で導入し、その後カナマイシン(kanamycin)25mg/Lを含有する選択培地に塗抹し、それぞれの形質転換株を得た。
実施例3-4で作製したpECCG117-metX WTベクターを実施例4-1で作製したATCC13032△metB△metY lysC(L377K)△NCgl2335、ATCC13032△metB△metY lysC(L377K)△NCgl2335::PCJ7-yjeH(eco,WT)、ATCC13032△metB△metY lysC(L377K)△NCgl2335::PCJ7-yjeH(eco,F92N)、ATCC13032△metB△metY lysC(L377K)△NCgl2335::PCJ7-yjeH(eco,F351L)に電気パルス法で導入し、その後カナマイシン(kanamycin)25mg/Lを含有する選択培地に塗抹し、それぞれの形質転換株を得た。
ホモセリン生産培地(pH7.2)
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)
実施例3-4で作製したpECCG117-metX WTベクターを実施例4-1で作製したATCC13032△metB△metY lysC(L377K)ΔNCgl2335、ATCC13032△metB△metY lysC(L377K)△NCgl2335::PCJ7-yjeH(eco,WT)、ATCC13032△metB△metY lysC(L377K)△NCgl2335::PCJ7-yjeH(eco,F92N)、ATCC13032△metB△metY lysC(L377K)△NCgl2335::PCJ7-yjeH(eco,F351L)に電気パルス法で導入し、その後カナマイシン(kanamycin)25mg/Lを含有する選択培地に塗抹し、それぞれの形質転換株を得た。
2XYT培地
酵母抽出物10g,トリプトファン16g,グルコース40g,スペクチノマイシン50g(蒸留水1リットル中)
Claims (16)
- 配列番号1のアミノ酸配列において、i)92番目に相当する位置のアミノ酸のアスパラギンへの置換、ii)351番目に相当する位置のアミノ酸のロイシンへの置換、又はiii)i)及びii)のアミノ酸置換を有し、
配列番号1のアミノ酸配列と95%以上100%未満の相同性を有する、内膜タンパク質YjeHの変異体。 - 前記変異体は、O-アセチルホモセリン又はホモセリン排出能を有するものである、請求項1に記載の変異体。
- 請求項1に記載の変異体をコードするポリヌクレオチド。
- 請求項3に記載のポリヌクレオチドを含むベクター。
- 配列番号1のアミノ酸配列において、i)92番目に相当する位置のアミノ酸のアスパラギンへの置換、ii)351番目に相当する位置のアミノ酸のロイシンへの置換、又はiii)i)及びii)のアミノ酸置換を有し、配列番号1のアミノ酸配列と95%以上100%未満の相同性を有する、内膜タンパク質YjeHの変異体、及び前記変異体をコードするポリヌクレオチドの少なくとも1つを含む微生物。
- 前記微生物は、非改変微生物より増加したO-アセチルホモセリン又はホモセリン生産能を有するものである、請求項5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5に記載の微生物。
- 配列番号1のアミノ酸配列において、i)92番目に相当する位置のアミノ酸のアスパラギンへの置換、ii)351番目に相当する位置のアミノ酸のロイシンへの置換、又はiii)i)及びii)のアミノ酸置換を有し、配列番号1のアミノ酸配列と95%以上100%未満の相同性を有する、内膜タンパク質YjeHの変異体、及び前記変異体をコードするポリヌクレオチドの少なくとも1つを含む微生物を培地で培養するステップを含む目的産物生産方法。
- 前記方法は、培養した培地又は微生物から目的産物を回収するステップをさらに含む、請求項8に記載の目的産物生産方法。
- 前記目的産物は、O-アセチルホモセリン又はホモセリンである、請求項8に記載の目的産物生産方法。
- 配列番号1のアミノ酸配列において、i)92番目に相当する位置のアミノ酸のアスパラギンへの置換、ii)351番目に相当する位置のアミノ酸のロイシンへの置換、又はiii)i)及びii)のアミノ酸置換を有し、配列番号1のアミノ酸配列と95%以上100%未満の相同性を有する、内膜タンパク質YjeHの変異体、及び前記変異体をコードするポリヌクレオチドの少なくとも1つを含む微生物を培地で培養してO-アセチルホモセリンを生産するステップと、
前記O-アセチルホモセリンと硫化物を反応させてO-アセチルホモセリンをメチオニンに変換するステップとを含むメチオニン生産方法。 - 配列番号1のアミノ酸配列において、i)92番目に相当する位置のアミノ酸のアスパラギンへの置換、ii)351番目に相当する位置のアミノ酸のロイシンへの置換、又はiii)i)及びii)のアミノ酸置換を有し、配列番号1のアミノ酸配列と95%以上100%未満の相同性を有する、内膜タンパク質YjeHの変異体、及び前記変異体をコードするポリヌクレオチドの少なくとも1つを含む微生物を培地で培養してO-アセチルホモセリン又はホモセリンを生産するステップと、
前記O-アセチルホモセリン又はホモセリンをグルホシネートに変換するステップとを含むグルホシネート生産方法。 - 請求項5に記載の微生物又は前記微生物の培養物を含むホモセリン生産用組成物。
- 請求項5に記載の微生物又は前記微生物の培養物を含むO-アセチルホモセリン生産用組成物。
- O-アセチルホモセリン又はホモセリン生産のための請求項1に記載の内膜タンパク質YjeH変異体の使用。
- O-アセチルホモセリン又はホモセリン生産のための請求項5に記載の微生物の使用。
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