JP2023521310A - グルタミン生産能を向上させる形質転換用組換えベクターおよびこれを導入した菌株 - Google Patents
グルタミン生産能を向上させる形質転換用組換えベクターおよびこれを導入した菌株 Download PDFInfo
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- JP2023521310A JP2023521310A JP2022560115A JP2022560115A JP2023521310A JP 2023521310 A JP2023521310 A JP 2023521310A JP 2022560115 A JP2022560115 A JP 2022560115A JP 2022560115 A JP2022560115 A JP 2022560115A JP 2023521310 A JP2023521310 A JP 2023521310A
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- glutamine
- transformation
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Abstract
Description
ベクターの作製に使用した材料は、Wizard Genomic DNA Purification Kit(Promega、USA)、PrimeSTAR Max DNA Polymerase(Takara、Japan)、DNA ligation kit(Takara、Japan)、HindIII、BamHI(NEB、England)を使用した。
KFCC-10694菌株(Corynebacterium glutamicum MWM-891020)の染色体DNAを鋳型としてプライマー1およびプライマー2でPCRを実施して、KFCC-10694のglnAのleft arm増幅産物を得た。同じく、プライマー3およびプライマー4の組み合わせでPCRを実施して、glnAのright arm増幅産物を得た。
前記glnA欠失用ベクターと同様の方法により、プライマー5とプライマー6との組み合わせでPCRを実施して、KFCC-10694のglnEのleft arm増幅産物を得て、プライマー7とプライマー8との組み合わせでPCRを実施して、glnEのright arm増幅産物を得た。
ATCC13032のglnA遺伝子DNAを鋳型としてプライマー9およびプライマー10の組み合わせでPCRを実施して、glnA(AT)増幅産物を得た。
コンピテント細胞で作られたKFCC10694菌株に、前記実施例1で作製されたpK19ms/△glnAベクターを電気衝撃療法(electroporation)で導入し、2YT KM AGAR培地に塗抹後、30℃の培養器で4日間培養してコロニーを得た。1次相同組換えが誘導されたコロニーのうち形質転換が確認されたコロニーを2YT液体培地で12時間培養後、2YT Sucrose GM AGAR培地に塗抹し、2次相同組換えにより抗生剤マーカーを除去した。選別されたコロニーをPCRおよび配列分析によりglnA遺伝子が意図どおりに除去されたかを最終確認した。前記過程により作製されたglnA遺伝子が欠損した菌株をD10694Aと名付けた。
実施例2で作製されたpa’-glnA(ATCC13032)ベクター、pa’-glnA(KFCC10694)ベクターを、前記実施例3で作製したD10694AおよびD10694AE菌株に電気衝撃療法(electroporation)で導入した。ベクターを導入した菌株を2YT KM AGAR培地に塗抹し、30℃の培養器で3日間培養してコロニーを得た。前記過程により作製された菌株をD10694A/pa-glnA(AT)、D10694A/pa-glnA(KF)、D10694AE/pa-glnA(AT)、D10694AE/pa-glnA(KF)と名付けた。
種培地20mlを500mlの三角フラスコに分注して、通常の方法により加圧滅菌した後、菌株を接種して、30℃で24時間振盪培養したものを種菌培養液とした。生産培地100mlを500mlの三角フラスコに分注して、通常の方法により加圧滅菌した後、予め用意した種菌培養液100mlを接種して、30℃で72時間振盪培養した。D10694AとD10694AE菌株に対する生産性の比較には、培地に100mg/Lのグルタミンを添加した。培養終了液でのL-グルタミン含有量の決定は、通常のHPLC法で定量した。
Claims (8)
- 配列番号1のアミノ酸配列からなるグルタミン合成酵素をコードする塩基配列を含む形質転換用ベクター。
- 前記グルタミン合成酵素をコードする塩基配列は、配列番号2の塩基配列からなるものである、
請求項1に記載の形質転換用ベクター。 - 前記形質転換用ベクターは、前記グルタミン合成酵素をコードする塩基配列と作動可能に連結されたプロモーターを含むものである、
請求項1に記載の形質転換用ベクター。 - 前記形質転換用ベクターは、前記グルタミン合成酵素をコードする塩基配列と作動可能に連結された転写終結因子配列を含むものである、
請求項1に記載の形質転換用ベクター。 - 請求項1に記載の形質転換用ベクターで形質転換された菌株。
- 前記菌株は、内生glnE遺伝子の発現が不活性化されたものである、
請求項5に記載の菌株。 - 前記菌株は、コリネバクテリウムグルタミカム(Corynebacterium glutamicum)である、
請求項5に記載の菌株。 - 請求項5に記載の菌株を培養するステップを含む、
グルタミン生産方法。
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