JP2018502589A - 新規プロモーター及びその用途 - Google Patents
新規プロモーター及びその用途 Download PDFInfo
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- JP2018502589A JP2018502589A JP2017538588A JP2017538588A JP2018502589A JP 2018502589 A JP2018502589 A JP 2018502589A JP 2017538588 A JP2017538588 A JP 2017538588A JP 2017538588 A JP2017538588 A JP 2017538588A JP 2018502589 A JP2018502589 A JP 2018502589A
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- Prior art keywords
- peccg117
- promoter
- gfp
- vector
- gene
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Abstract
Description
(1)Po2を含む組み換えベクター及び形質転換菌株の作製
目的遺伝子の発現を誘導するプロモーターを合成するために、コリネバクテリウム属微生物とエシェリキア属微生物とに由来の多様なプロモーター配列を分析し、配列番号1のヌクレオシドを有するプロモーターを合成し、それをo2プロモーター(以下、「Po2」と称する)と命名した。Po2の発現誘導活性を測定するために、Po2を、GFP遺伝子のORFと作動自在に連結して組み換えベクターを製造し、それをコリネ型細菌及び大腸菌に形質転換し、形質転換菌株をそれぞれ作製した。
(1.1.1)ベクターの作製
合成作製したプロモーターPo2をテンプレートに、KpnI/EcoRV切断部位を含む配列番号2及び配列番号3をプライマーとして利用してPCRを行った。該PCRは、94℃で5分間変性後、94℃で30秒間変性、60℃で30秒間アニーリング、72℃で30秒間重合を30回反復した後、72℃で7分間重合反応を行った。その結果、約100bpのPo2を得た。
ベクターpECCG117、及び前述のところで作製された組み換えベクターpECCG117−Po2−gfpを、コリネバクテリウム・グルタミクムATCC13032に、電気パルス法(Appl. Microbiol. Biothcenol. (1999) 52: 541-545)でそれぞれ形質転換した後、カナマイシン(kanamycin)25mg/Lを含んだ選別培地において形質転換菌株を獲得し、それをATCC13032/pECCG117及びATCC13032/pECCG117−Po2−gfpとそれぞれ命名した。
(1.2.1)ベクターの作製
アルジニン生合成主要遺伝子である、二機能性性オルニチンアセチルトレンスフェラーゼ(bifunctional ornithine acetyltransferase)/N−アセチルグルタメート合成酵素(acetylglutamate synthase)をコーディングするargJ(Ncgl1341、配列番号7)がo2プロモーターによって発現されるベクターを作製するために、pECCG117−Po2−gfpを利用して、pECCG117−Po2−argJベクターを作製した。
前記作製された組み換えベクターpECCG117−Po2−argJを、アルジニン生産菌株コリネバクテリウム・グルタミクムKCCM10741P(大韓民国登録特許第10−0791659号)に電気パルス法で形質転換した後、カナマイシン(kanamycin)25mg/Lを含んだ選別培地で形質転換菌株を獲得し、それをKCCM10741P/pECCG117−Po2−argJと命名した。
(1.3.1)ベクターの作製
バリン生合成主要遺伝子である、分枝鎖アミノ酸アミノトレンスフェラーゼ(branched-chain amino acid aminotransferase)をコーディングするilvE(Ncgl2123、配列番号10)が、Po2によって発現されるベクターを作製するために、pECCG117−Po2−gfpを利用して、pECCG117−Po2−ilvEベクターを作製した。
前記作製された組み換えベクターpECCG117−Po2−ilvEを、バリン生産菌株コリネバクテリウム・グルタミクムKCCM111201P(大韓民国登録特許第10−1117022号)に電気パルス法で形質転換した後、カナマイシン(kanamycin)25mg/Lを含んだ選別培地で形質転換菌株を獲得し、それをKCCM11201P/pECCG117−Po2−ilvEと命名した。
本比較例では、Po2の発現油も活性程度を確認するために、GFPを利用して、従来公知された強いプロモーター(Ptrc、Pcj1、Pcj4、Pcj7(大韓民国登録特許第10−0620092号))または野生型プロモーター(aceEP(WT))を、GFP遺伝子のORFと作動自在に連結して組み換えベクターを製造し、それをコリネ型細菌及び大腸菌に形質転換し、形質転換菌株をそれぞれ作製した。
米国国立保健院の遺伝子銀行(NIH Genbank)を基にして、aceEP(WT)の塩基配列を確保し、野生型コリネバクテリウム・グルタミクムATCC13032の染色体をテンプレートにし、KpnI/EcoRV切断部位を含む配列番号13及び配列番号14をプライマーとして利用し、前記実施例1の(1.1)と同一方法で組み換えベクターを作製し、pECCG117−aceEP(WT)−gfpと命名した。
米国国立保健院の遺伝子銀行(NIH Genbank)を基にして、Ptrcの塩基配列を確保し、pTrc99A(NCBIGenBank、M22744)をテンプレートにし、KpnI/EcoRV切断部位を含む配列番号15及び配列番号16をプライマーとして利用し、前記実施例1の(1.1)と同一方法で組み換えベクターを作製し、pECCG117−Ptrc−gfpと命名した。
(3.1)アルジニン生産能を有するコリネバクテリウム・グルタミクム形質転換菌株の作製
プライマーとして、配列番号9及び配列番号17を利用したことだけを除いては、前記実施例1の(1.2.1)と同一方法で、pECCG117−Pcj7−gfpベクターを利用してベクターを作製し、それをpECCG117−Pcj7−argJと命名した。
前述のところで作製したベクターでもって、前記実施例1の(1.2.2)と同一方法で形質転換した菌株を作製し、KCCM10741P/pECCG117−Pcj7−argJと命名した。
プライマーとして、配列番号12及び配列番号18を利用したことだけを除いては、前記実施例1の(1.3.1)と同一方法で、pECCG117−Pcj7−gfpベクターを利用してベクターを作製し、それをpECCG117−Pcj7−ilvEと命名した。
(1)コリネバクテリウム・グルタミクムでのPo2の発現誘導活性確認
コリネバクテリウム・グルタミクムにおいて、Po2の発現誘導活性を確認するために、前記実施例1の(1.1.2)で作製した形質転換菌株ATCC13032/pECCG117−Po2−gfpのGFP活性を、ATCC13032/pECCG117、及び比較例1の(1)で作製したATCC13032/pECCG117−aceEP(WT)−gfp、ATCC13032/pECCG117−Pcj1−gfp、ATCC13032/pECCG117−Pcj4−gfp及びATCC13032/pECCG117−Pcj7−gfpのGFP活性と比較した。
ブドウ糖20g、硫酸アンモニウム5g、酵母抽出物5g、尿素1.5g、KH2PO44g、K2HPO4 8g、MgSO47H2O 0.5g、ビオチン150μg、チアミン塩酸塩1.5mg、カルシウムパントテン酸3mg、ニコチン酸アミド3mg(蒸溜水1リットル基準)、pH7.2
大腸菌において、Po2の発現誘導活性を確認するために、前記実施例1の(1.1.2)で作製した形質転換菌株DH5α/pECCG117−Po2−gfpのGFP活性を、比較例1の(2)で作製したDH5α/pECCG117−Ptrc−gfp、DH5α/pECCG117−Pcj1−gfp及びDH5α/pECCG117−Pcj4−gfpのGFP活性と比較した。
(1)アルジニン生産能強化菌株の評価
アルジニン生合成主要遺伝子であるargJを、Po2によって発現を強化させる場合、アルジニン生産能に及ぼす影響を評価するために、前記実施例1の(1.2.2)で製造したargJ強化菌株であるKCCM10741P/pECCG117−Po2−argJのアルジニン生産能を、形質転換されていないKCCM10741P菌株、及び比較例1の(3.1)で製造したKCCM10741P/pECCG117−Pcj7−argJのアルジニン生産能と比較した。
ブドウ糖6%、硫酸アンモニウム3%、第1リン酸カリウム0.1%、硫酸マグネシウム七水和物0.2%、CSL(とうもろこし浸漬液)1.5%、NaCl1%、Yeast Extract 0.5%、ビオチン100μg/L、pH7.2
バリン生合成主要遺伝子であるilEを、Po2によって発現を強化させる場合、L−バリン生産能に及ぼす影響を評価するために、前記実施例1の(1.3.2)で製造したilvE強化菌株であるKCCM11201P/pECCG117−Po2−ilvEのL−バリン生産能を、形質転換されていないKCCM11201P菌株、及び前記比較例1の(3.2)で製造したKCCM11201P/pECCG117−Pcj7−ilvEのL−バリン生産能と比較した。
ブドウ糖5%、硫酸アンモニウム2%、第1リン酸カリウム0.1%、硫酸マグネシウム七水和物0.05%、CSL(とうもろこし浸漬液)2.0%、ビオチン200μg/L、pH7.2
Claims (7)
- 配列番号1のヌクレオチド配列を有するプロモーター。
- 請求項1に記載のプロモーターを含む遺伝子発現調節配列。
- 請求項2に記載の遺伝子発現調節配列、及びそれに作動自在に連結された目的遺伝子を含むベクター。
- 請求項3に記載のベクターを含む宿主細胞。
- コリネバクテリウム属またはエシェリキア属に属するバクテリア細胞であることを特徴とする、請求項4に記載の宿主細胞。
- 請求項4または5に記載の宿主細胞を培養する段階と、
前記宿主細胞、またはそれを培養した培地で目的物質を分離する段階と、
を含む、目的物質を生産する方法。 - 前記目的物質は、アミノ酸であることを特徴とする、請求項6に記載の方法。
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