JP2023530535A - 新規なプロモーター及びその用途 - Google Patents
新規なプロモーター及びその用途 Download PDFInfo
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- JP2023530535A JP2023530535A JP2022546632A JP2022546632A JP2023530535A JP 2023530535 A JP2023530535 A JP 2023530535A JP 2022546632 A JP2022546632 A JP 2022546632A JP 2022546632 A JP2022546632 A JP 2022546632A JP 2023530535 A JP2023530535 A JP 2023530535A
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- polynucleotide
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Abstract
Description
具体的には、本出願のプロモーター活性を有するポリヌクレオチドは、上記配列番号1のポリヌクレオチド配列において218番、219番、220番、221番、222番、225番及び227番のヌクレオチドが他のヌクレオチドに置換されたものであってもよいが、これに制限されない。
また、公知の遺伝子配列から製造できるプローブ、例えば、前述のポリヌクレオチド配列の全体又は一部に対する相補配列とストリンジェントな条件の下、ハイブリダイズし、同一な活性を有するポリヌクレオチド配列であれば、制限なく含むことができる。上記「ストリンジェントな条件(stringent condition)」とは、ポリヌクレオチド間の特異的ハイブリダイゼーションを可能にする条件を意味する。このような条件は、文献(例えば、J. Sambrook et al.,Molecular Cloning,A Laboratory Manual,2nd Edition,Cold Spring Harbor Laboratory press,Cold Spring Harbor,New York,1989; F.M. Ausubel et al.,Current Protocols in Molecular Biology,John Wiley & Sons,Inc.,New York)に具体的に記載されている。例えば、相同性(homology)または同一性(identity)が高い遺伝子同士、40%以上、具体的には70%以上、80%以上、85%以上、90%以上、より具体的には95%以上、さらに具体的には97%以上、特に具体的には99%以上の相同性または同一性を有する遺伝子同士をハイブリダイズし、それより相同性または同一性が低い遺伝子同士をハイブリダイズしない条件、または通常のサザンハイブリダイゼーション(southern hybridization)の洗浄条件である60℃、1XSSC、0.1%SDS、具体的には60℃、0.1XSSC、0.1%SDS、より具体的には68℃、0.1XSSC、0.1%SDSに相当する塩濃度及び温度で1回、具体的には、2回~3回洗浄する条件を列挙することができる。
具体的には、上記宿主細胞はコリネバクテリウム属微生物、より具体的にコリネバクテリウム・グルタミクム(Corynebacterium glutamicum)であってもよいが、これに制限されるものではない。
実施例1-1.ランダム突然変異法を用いたtktプロモーター変異ライブラリの製作
まず、米国国立衛生研究所の遺伝子バンク(NIH GenBank)を根拠にして野生型(wild type)コリネバクテリウム・グルタミクムATCC13032のtkt遺伝子(NCBI登録番号NCgl1512)のプロモーター部位を含む塩基配列(配列番号1)を確保した。配列番号1の塩基配列からなるtkt遺伝子のプロモーター(Pntkt)を鋳型にDiversify PCR Random Mutagenesis Kit(takara)を用い、配列番号3及び4のプライマーを用いてメーカーのマニュアル通りにランダムに突然変異を誘発させて配列が異なるtktプロモーター変異PCR産物(Pmtkt)を得た。また、GFP遺伝子のORF(Open Reading Frame)はpGFPuvベクター(clontech、米国)を鋳型に、配列番号5及び6のプライマーを用いてPCRを行った。重合酵素はSolg(登録商標) Pfu-X DNAポリメラーゼを使用し、PCR増幅の条件は95℃で5分間変性後、95℃で30秒間変性、58℃で30秒間アニーリング、72℃で60秒間の重合を30回繰り返した後、72℃で5分間重合反応を行い、GFPのORFを含む遺伝子断片を得た。
ベクターpCES208と上記実施例1-1で製作された組換えベクターライブラリpCES208_Pm1tkt_gfpからpCES208_Pm50tkt_gfp及びpCES208_Pntkt_gfpをコリネバクテリウム・グルタミクムATCC13032に電気穿孔法(Appl. Microbiol. Biothcenol.(1999) 52:541-545)で形質転換した後、カナマイシン(kanamycin)25mg/Lを含有した選別培地で形質転換した菌株を選別し、これをそれぞれATCC13032/pCES208、ATCC13032/pCES208_Pm1tkt_gfpからATCC13032/pCES208_Pm50tkt_gfp及びATCC13032/pCES208_Pntkt_gfpと命名した。
tktプロモーター変異体の活性を確認するために、上記実施例1-2で獲得した形質転換菌株を以下の方法で培養し、GFPの活性を測定した。
実施例2-1.コリネバクテリウム・グルタミクムATCC13032Pm4tktプロモーター変異導入ベクターの製作
上記Pm4tktプロモーター変異をコリネバクテリウム・グルタミクムATCC13032に導入するためのベクターを製作するために、配列番号9及び10と配列番号13及び14のプライマーセットを用いてそれぞれ野生型コリネバクテリウム・グルタミクムATCC13032菌株の染色体を鋳型にtktプロモーターアップストリーム(upstream)領域とtktのORF一部を含むダウンストリーム(downstream)領域を得た。また、配列番号11及び12を用いてpCES208_Pm4tkt_gfpのベクターを鋳型としてプロモーター変異に該当するPCR産物を得た。重合酵素はSolg(登録商標) Pfu-X DNAポリメラーゼを使用し、PCR増幅の条件は95℃で5分間変性後、95℃で30秒間変性、58℃で30秒間アニーリング、72℃で60秒間の重合を30回繰り返した後、72℃で5分間重合反応を行い、それぞれのPCR産物を得た。上記三増幅産物をあらかじめSmaI制限酵素で切断して準備したpDCM2ベクター(韓国公開番号第10-2020-0136813号)と混合してギブソン・アッセンブリー方法を用いてクローニングすることにより組換えプラスミドを得、これをpDCM2-Pm4tkt_tktと命名した。クローニングはギブソン・アッセンブリー試薬と各遺伝子の断片を計算されたモル数で混合後、50℃で1時間保存することにより行った。
上記Pm4tktプロモーター変異(配列番号2)を有するtkt遺伝子をコリネバクテリウム・グルタミクムATCC13869に1copy導入するためのベクターを製作した。
aroP位置に既に導入された自己プロモーターのtkt遺伝子のプロモーターをPm4tktプロモーター変異体で交換するために実施例2-2で製作されたpDCM2-△aroP::Pm4tkt_tktベクターを鋳型として配列番号23及び24を用いてPCRを行い、Pm4tkt配列が含まれた遺伝子断片を得た。これをSmaI制限酵素で切断して準備したpDCM2のベクターと混合してギブソン・アッセンブリー方法を用いてクローニングすることにより、組換えプラスミドを得、これをpDCM2-△Pn::Pm4tkt_tktと命名した。クローニングはギブソン・アッセンブリー試薬と各遺伝子の断片を計算されたモル数で混合後、50℃で1時間保存することにより行った。
3-1.リシン生産能の評価
3-1-1.tktプロモーター変異体が導入されたL-リシン生産菌株の製作
実施例2-1で製作されたpDCM2-Pm4tkt_tktベクターを用いてtktプロモーター変異体が形質転換された菌株を製作した。このため、L-リシン生産菌株であるコリネバクテリウム・グルタミクムCJ3P(US 9556463 B2)菌株に上記ベクターを形質転換させ、染色体内にtktプロモーター変異体の配列を導入した。CJ3P菌株は、既に公知となった技術に基づいて野生株に3種の変異(pyc(P458S)、hom(V59A)、lysC(T311I)を導入して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・グルタミクム菌株である。
親株として利用したコリネバクテリウム・グルタミクムCJ3P菌株及び実施例3-1-1で製作されたコリネバクテリウム・グルタミクムCJ3P::Pm4tkt_tkt菌株のL-リシン生産能を評価するために、以下の方法で菌株を培養した後、分析した。
ブドウ糖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、チアミン塩酸塩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リットルを基準)
ブドウ糖45g、大豆タンパク質10g、糖蜜10g、(NH4)2SO4 15g、KH2PO4 0.55g、MgSO4・7H2O 0.6g、FeSO4・7H2O 9mg、MnSO4・5H2O 9mg、ビオチン0.9mg、チアミン塩酸塩4.5mg、CaCO3 30g、パントテン酸カルシウム4.5mg、ニコチンアミド30mg、ZnSO4 0.45mg、CuSO4 0.45mg(蒸留水1リットルを基準)
3-2-1.L-スレオニン生産菌株の製作
実施例2-1で製作されたpDCM2-Pm4tkt_tktベクターを用いてtktプロモーター変異体で形質転換した菌株を製作するために、まず、コリネバクテリウム・グルタミクムATCC13032菌株を基盤にlysC(L377K)変異体(韓国登録特許第10-2011994号)とhom(R398Q)変異体(韓国登録特許第10-1947959号)を導入したL-スレオニン生産菌株を製作した。
上記実施例2-1で製作したpDCM2-Pm4tkt_tktベクターを電気穿孔法でコリネバクテリウム・グルタミクムATCC13032::lysC(L377K)-hom(R398Q)菌株に導入した後、カナマイシン25mg/Lを含有した選別培地で形質転換菌株を得た。2次組換え課程(cross-over)で染色体上に挿入されたDNA断片によりtktプロモーター変異体が導入された菌株を配列番号7及び8のプライマーを用いてPCR及び塩基配列分析を通じて選別し、上記選別された菌株をコリネバクテリウム・グルタミクムATCC13032::lysC(L377K)-hom(R398Q)-Pm4tkt_tktと命名した。
親株として利用したコリネバクテリウム・グルタミクムATCC13032::lysC(L377K)-hom(R398Q)、実施例3-2-2で製作されたATCC13032::lysC(L377K)-hom(R398Q)-Pm4tkt_tkt菌株のL-スレオニン生産能を評価するために下記の方法で菌株を培養した後、分析した。
ブドウ糖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、チアミン塩酸塩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リットルを基準)
ブドウ糖45g、大豆タンパク質10g、糖蜜10g、(NH4)2SO4 15g、KH2PO4 0.55g、MgSO4・7H2O 0.6g、FeSO4・7H2O 9mg、MnSO4・5H2O 9mg、ビオチン0.9mg、チアミン塩酸塩4.5mg、CaCO3 30g、パントテン酸カルシウム4.5mg、ニコチンアミド30mg、ZnSO4 0.45mg、CuSO4 0.45mg (蒸留水1リットルを基準)
3-3-1.tktプロモーター変異体が導入されたO-アセチルホモセリン生産菌株の製作
上記実施例2-1で製作したpDCM2-Pm4tkt_tktベクターを電気穿孔法で野生型菌株であるコリネバクテリウム・グルタミクムATCC13032に導入した後、カナマイシン25mg/Lを含む選別培地で形質転換菌株を得た。2次組換え過程(cross-over)で染色体上に挿入されたDNA断片によりtktプロモーター変異体が導入された菌株を配列番号7及び8のプライマーを用いてPCR及び塩基配列分析を通じて選別し、上記選別された菌株をコリネバクテリウム・グルタミクムATCC13032::Pm4tkt_tktと命名した。
親株として利用したコリネバクテリウム・グルタミクムATCC13032、実施例3-3-1で製作されたATCC13032::Pm4tkt_tkt菌株のO-アセチルホモセリン生産能を評価するために、下記の方法で菌株を培養した後、分析した。
ブドウ糖30g、KH2PO4 2g、尿素3g、(NH4)2SO4 40g、ペプトン2.5g、CSL(Corn steep liquor,Sigma)5g(10ml)、MgSO4・7H2O 0.5g、CaCO3 20g(蒸留水1リットルを基準)
3-4-1.tktプロモーター変異体が導入されたL-イソロイシン生産菌株の製作
実施例2-1で製作されたpDCM2-Pm4tkt_tktベクターを用いてtktプロモーター変異体が形質転換した菌株を製作するために、まず、コリネバクテリウム・グルタミクムCJP1(韓国登録特許第10-1996769号)菌株に上記ベクターを形質転換させ、染色体内にtktプロモーター変異体の配列を導入した。その後、既に公知となったL-スレオニンデヒドラターゼ(L-threonine dehydratase)をコードするilvA遺伝子の323番目のアミノ酸であるバリンがアラニンに変異されたilvA遺伝子(V323A)(Appl. Enviro. Microbiol.,Dec. 1996,p.4345-4351)を含むベクターを追加で導入してL-イソロイシン生産菌株を製作した(韓国登録特許第10-1996769号)。
コリネバクテリウム・グルタミクムCJP1/pECCG117-ilvA(V323A)、CJP1::Pm4tkt_tkt/pECCG117-ilvA(V323A)菌株のL-イソロイシン生産能を評価するために、以下の方法で菌株を培養した後、分析した。
ブドウ糖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、チアミン塩酸塩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リットルを基準)
ブドウ糖45g、大豆タンパク質10g、糖蜜10g、(NH4)2SO4 15g、KH2PO4 0.55g、MgSO4・7H2O 0.6g、FeSO4・7H2O 9mg、MnSO4・5H2O 9mg、ビオチン0.9mg、チアミン塩酸塩4.5mg、CaCO3 30g、パントテン酸カルシウム4.5mg、ニコチンアミド30mg、ZnSO4 0.45mg、CuSO4 0.45mg (蒸留水1リットルを基準)
3-5-1.L-トリプトファン生産菌株の製作
Pm4tktプロモーター変異体の効果を確認するために、まず、野生型コリネバクテリウム・グルタミクムATCC13869菌株を基盤にL-トリプトファン生産菌株を製作した。
トリプトファンの生産は芳香族アミノ酸代謝回路に起因し、この代謝回路はホスホエノールピルビン酸(Phosphoenolpyruvate)とエリトロース4-リン酸(Erythrose4-phosphate)の縮合反応から始まる。したがって、二前駆体の円滑な供給は、トリプトファン生産の向上に必須であり、相対的に不足していると知られているエリトロース4-リン酸の円滑な供給のためにtkt遺伝子の過発現が必須である。これに実施例2-2で製作されたpDCM2-△aroP,pDCM2-△aroP::Pm4tkt_tkt及びpDCM2-△aroP::Pntkt_tktを用いてL-トリプトファン生産菌株を製作した。
親株として利用したコリネバクテリウム・グルタミクム ATCC13869::PSPL7_trpE(S38R)、実施例3-5-2で製作された ATCC13869::PSPL7_trpE(S38R)△aroP,ATCC13869::PSPL7_trpE(S38R)△aroP::Pntkt_tkt,ATCC13869::PSPL7_trpE(S38R)△aroP::Pm4tkt_tkt菌株のL-トリプトファン生産能を評価するために、以下の方法で菌株を培養した後、分析した。
ブドウ糖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、チアミン塩酸塩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リットルを基準)
ブドウ糖30g、(NH4)2SO4 15g、MgSO4 7H2O 1.2g、KH2PO4 1g、酵母抽出物5g、ビオチン900μg、チアミン塩酸塩4500μg、パントテン酸カルシウム4500μg、CaCO3 30g(蒸留水1リットルを基準)。
3-6-1.L-チロシン生産菌株の製作
Pm4tktプロモーター変異体の効果を確認するために、L-チロシン生産菌株であるCM06-0010(韓国登録特許第10-2134418号、韓国微生物保存センター(KCCM)寄託番号KCCM12487P)菌株を親株として形質転換を進めた。
親株として利用したコリネバクテリウム・グルタミクムCM06-0010菌株と実施例3-6-1で製作されたCM06-0010△Pn::Pm4tkt_tkt菌株のL-チロシン生産能を評価するために、以下の方法で菌株を培養した後、分析した。
ブドウ糖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、チアミン塩酸塩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リットルを基準)
ブドウ糖30g、(NH4)2SO4 15g、MgSO47H2O 1.2g、KH2PO4 1g、酵母抽出物5g、ビオチン900μg、チアミン塩酸塩4500μg、パントテン酸カルシウム4500μg、CaCO3 30g(蒸留水1リットルを基準)。
3-7-1.L-フェニルアラニン生産菌株の製作
Pm4tktプロモーター変異体の効果を確認するために、まず、野生型コリネバクテリウム・グルタミクムATCC13869の菌株を基盤にL-フェニルアラニン生産菌株を製作した(韓国登録特許第10-2134418号を参照)。
実施例2-2で製作されたpDCM2-△aroP、pDCM2-△aroP::Pm4tkt_tkt及びpDCM2-△aroP::Pntkt_tktを用いてL-フェニルアラニン生産菌株を製作した。実施例3-7-1で製作したATCC13869ΔtyrA::PgapA-tyrAmΔBBD29_14470::PgapA-aroGm菌株に上記三ベクターを電気穿孔法で導入した後、カナマイシン25mg/Lを含有した選別培地で形質転換菌株を得た。2次交差過程を経て染色体上でaroPが欠損したり、aroP位置にPntkt_tkt遺伝子とPm4tkt_tkt遺伝子がそれぞれ挿入された菌株を得た。配列番号46及び47を利用したPCRとゲノムシーケンスを通じて当該遺伝的操作を確認し、製作された菌株をそれぞれATCC13869ΔtyrA::PgapA-tyrAmΔBBD29_14470::PgapA-aroGm△aroP,ATCC13869ΔtyrA::PgapA-tyrAmΔBBD29_14470::PgapA-aroGm△aroP::Pntkt_tkt,ATCC13869ΔtyrA::PgapA-tyrAmΔBBD29_14470::PgapA-aroGm△aroP::Pm4tkt_tktと命名した。
親株として利用したコリネバクテリウム・グルタミクム ATCC13869ΔtyrA::PgapA-tyrAm ΔBBD29_14470::PgapA-aroGm 、実施例3-7-2で製作された ATCC13869ΔtyrA::PgapA-tyrAmΔBBD29_14470::PgapA-aroGm△aroP,ATCC13869ΔtyrA::PgapA-tyrAm ΔBBD29_14470::PgapA-aroGm△aroP::Pntkt_tkt,ATCC13869ΔtyrA::PgapA-tyrAm ΔBBD29_14470::PgapA-aroGm△aroP::Pm4tkt_tkt菌株のL-フェニルアラニン生産能を評価するために、以下の方法で菌株を培養した後、分析した。
ブドウ糖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、チアミン塩酸塩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リットルを基準)
ブドウ糖30g、(NH4)2SO4 15g、MgSO4 7H2O 1.2g、KH2PO4 1g、酵母抽出物5g、ビオチン900μg、チアミン塩酸塩4500μg、パントテン酸カルシウム4500μg、CaCO3 30g(蒸留水1リットルを基準)。
寄託機関名:韓国微生物保存センター(国外)
受託番号:KCCM12971P
受託日:20210405
Claims (13)
- 配列番号1のポリヌクレオチド配列において218番、219番、220番、221番、222番、225番及び227番のヌクレオチドが他のヌクレオチドに置換された、プロモーター活性を有するポリヌクレオチド。
- 上記ポリヌクレオチドは、配列番号1のポリヌクレオチド配列において218番のヌクレオチドであるシトシン(C)がチミン(T)に、219番のヌクレオチドであるシトシン(C)がグアニン(G)に、220番のヌクレオチドであるアデニン(A)がチミン(T)に、221番のヌクレオチドであるアデニン(A)がグアニン(G)に、222番のヌクレオチドであるチミン(T)がグアニン(G)に、225番のヌクレオチドであるアデニン(A)がチミン(T)に、227番のヌクレオチドであるシトシン(C)がアデニン(A)に置換されたものである、請求項1に記載のポリヌクレオチド。
- 上記ポリヌクレオチドは、配列番号2のヌクレオチド配列からなる、請求項1に記載のポリヌクレオチド。
- 上記ポリヌクレオチドは、目的タンパク質をコードする遺伝子と作動可能に連結される、請求項1~3のいずれか一項に記載のポリヌクレオチド。
- 請求項1~3のいずれか一項に記載のポリヌクレオチド;及び上記ポリヌクレオチドと作動可能に連結された目的タンパク質をコードする遺伝子を含む遺伝子発現カセット。
- 上記目的タンパク質は、トランスケトラーゼ(Transketolase)である、請求項5に記載の遺伝子発現カセット。
- 請求項1~3のいずれか一項に記載のポリヌクレオチド;及び上記ポリヌクレオチドと作動可能に連結された目的タンパク質をコードする遺伝子を含む、宿主細胞。
- 上記目的タンパク質は、トランスケトラーゼ(Transketolase)である、請求項7に記載の宿主細胞。
- 上記宿主細胞は、コリネバクテリウム属微生物である、請求項7に記載の宿主細胞。
- 上記コリネバクテリウム属微生物は、コリネバクテリウム・グルタミクム(Corynebacterium glutamicum)である、請求項9に記載の宿主細胞。
- 請求項7に記載の宿主細胞を培地で培養する段階;及び上記培地から目的物質を回収する段階;を含む目的物質を生産する方法。
- 上記目的物質は、アミノ酸である、請求項11に記載の方法。
- 上記目的物質は、リシン、スレオニン、O-アセチルホモセリン、イソロイシン、トリプトファン、チロシン及びフェニルアラニンからなる群から選択される一つ以上である、請求項11に記載の方法。
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