JP6463806B2 - L−アルギニン産生能が向上したコリネバクテリウム属微生物およびこれを用いたl−アルギニンの産生方法 - Google Patents
L−アルギニン産生能が向上したコリネバクテリウム属微生物およびこれを用いたl−アルギニンの産生方法 Download PDFInfo
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- JP6463806B2 JP6463806B2 JP2017132669A JP2017132669A JP6463806B2 JP 6463806 B2 JP6463806 B2 JP 6463806B2 JP 2017132669 A JP2017132669 A JP 2017132669A JP 2017132669 A JP2017132669 A JP 2017132669A JP 6463806 B2 JP6463806 B2 JP 6463806B2
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- arginine
- aspa
- corynebacterium
- microorganism
- aspartate
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Description
aspAがL−アルギニン産生に主な遺伝子であるか否かを確認するために、aspA欠損ベクターを製作し、L−アルギニン産生菌株であるコリネバクテリウムグルタミクムKCCM10741P(大韓民国特許登録第0791659号)に形質転換してL−アルギニン産生能を評価した。
染色体においてアスパラギン酸アンモニアリアーゼをコーディングする遺伝子であるaspA(Ncgl1446)遺伝子を欠失させるために、キアゲン社製のゲノミック−ティップシステム(QIAGEN Genomic−tip system)を用いて米国生物資源センター(American Type Culture Collection:ATCC)から購買したコリネバクテリウムグルタミクムATCC21831の染色体を抽出し、この染色体を鋳型として交差PCRを行った。
前記製作されたpDKO1446ベクターをL−アルギニン産生菌株であるコリネバクテリウムグルタミクムKCCM10741Pに形質転換し、2次交差過程を経て染色体上においてaspAが欠失したL−アルギニン産生菌株を得た。選別された菌株をKCCM10741ΔaspAと命名した。
前記製造された組み換えL−アルギニン産生菌株であるコリネバクテリウムグルタミクムKCCM10741ΔaspAを用いてaspAの欠失がL−アルギニン産生能に及ぼす影響を把握するために下記の方法を用いて培養した。
葡萄糖6%、硫酸アンモニウム3%、第1のリン酸カリウム0.1%、硫酸マグネシウム7水塩0.2%、CSL(トウモロコシ浸漬液)1.5%、NaCl1%、酵母エキス0.5%、ビオチン100mg/L、pH7.2
コリネバクテリウム由来のアスパラギン酸アンモニアリアーゼをコーディングする遺伝子であるaspA(Ncgl1446)の2コピーベクターを製作するために、コリネバクテリウムグルタミクムATCC21831染色体を鋳型として配列番号5および6のプライマー、配列番号7および8のプライマーを用いてPCRを行ってaspAがそれぞれ含まれているDNA断片を確保した。
前記実施例2において製作されたpD1446−2XベクターをL−アルギニン産生菌株であるコリネバクテリウムグルタミクムKCCM10741PおよびコリネバクテリウムグルタミクムATCC21831にそれぞれ形質転換し、2次交差過程を経て染色体上においてaspAが2コピー含まれているL−アルギニン産生菌株を得た。得られた菌株をそれぞれKCCM10741P::aspA_2XおよびATCC21831::aspA_2Xと命名した。
アスパラギン酸アミノ基転移酵素をコーディングする遺伝子であるaspB(Ncgl0237)2コピーベクターを製作するために、コリネバクテリウムグルタミクムATCC21831染色体を鋳型として配列番号9および10のプライマー、配列番号11および12のプライマーを用いてPCRを行ってaspBがそれぞれ含まれているDNA断片を確保した。
前記実施例4において製作されたpD0237−2XベクターをL−アルギニン産生菌株であるコリネバクテリウムグルタミクムKCCM10741P、コリネバクテリウムグルタミクムATCC21831にそれぞれ形質転換し、2次交差過程を経て染色体上においてaspBが2コピー含まれているL−アルギニン産生菌株を得た。得られた菌株をそれぞれKCCM10741P::aspB_2XおよびATCC21831::aspB_2Xと命名した。
前記実施例4において製作されたpD0237−2Xベクターを前記実施例3において製造された組み換え微生物であるKCCM10741P::aspA_2XおよびATCC21831::aspA_2Xにそれぞれ形質転換し、2次交差過程を経て染色体上においてaspAおよびaspBが2コピー含まれているL−アルギニン産生菌株を得た。得られた菌株をそれぞれKCCM10741P::aspA_2X::aspB_2XおよびATCC21831::aspA_2X::aspB_2Xと命名した。
前記実施例3、5および6において製造されたL−アルギニン産生菌株コリネバクテリウムグルタミクムKCCM10741P::aspA_2X、ATCC21831::aspA_2X、KCCM10741P::aspB_2X、ATCC21831::aspB_2X、KCCM10741P::aspA_2X::aspB_2XおよびATCC21831::aspA_2X::aspB_2Xを用いて、aspA強化またはaspB強化またはaspAおよびaspB同時強化がL−アルギニンの産生能に及ぼす影響を把握するために下記の方法を用いて培養した。
エシェリキア属由来のアスパラギン酸アンモニアリアーゼをコーディングする遺伝子であるaspA(NCBI−GeneID:12933698)をL−アルギニン産生能を有するコリネバクテリウムグルタミクムの染色体の内部に取り込むために、グルタメートエキスポーターとして知られているNcgl1221部位(site)を用いた(yggB: Appl Environ Microbiol. 2007 Jul;73(14):4491−8)。
前記製作されたpDKO1221−EC_aspAベクターをL−アルギニン産生菌株コリネバクテリウムグルタミクムKCCM10741PおよびATCC21831に形質転換し、2次交差過程を経て染色体上においてエシェリキア属由来aspA遺伝子が含まれているL−アルギニン産生菌株を得た。得られた菌株のそれぞれをKCCM10741PΔNcgl1221−EC_aspAおよびATCC21831ΔNcgl1221−EC_aspAと命名した。また、前記製作されたpDKO1221ベクターをL−アルギニン産生菌株コリネバクテリウムグルタミクムKCCM10741PおよびATCC21831に形質転換し、2次交差過程を経て染色体上においてNCgl1221が欠失したKCCM10741PΔNcgl1221およびATCC21831ΔNcgl1221菌株を得た。
前記実施例9において製造されたL−アルギニン産生菌株であるコリネバクテリウムグルタミクムKCCM10741PΔNcgl1221−EC_aspAおよびATCC21831ΔNcgl1221−EC_aspAを用いて、大腸菌由来のaspAの取り込みがL−アルギニン産生能に及ぼす影響を把握するために、下記のような方法を用いて培養した。
寄託機関名:韓国微生物保存センター(海外)
受託番号:KCCM11351P
受託日:2013年01月21日
[受託証の写し]
Claims (5)
- アスパラギン酸アンモニアリアーゼ及びアスパラギン酸アミノ基転移酵素の活性が強化された、L−アルギニン産生能が向上したコリネバクテリウム属微生物を培養培地で培養するステップと、
前記培養によって得られる培養培地からL−アルギニンを分離するステップと、
を含む、L−アルギニンを産生する方法。 - 前記アスパラギン酸アンモニアリアーゼは、コリネバクテリウム属微生物またはエシェリキア属微生物に由来するものである、請求項1に記載の方法。
- 前記アスパラギン酸アンモニアリアーゼは、配列番号21または配列番号22に記載のアミノ酸配列を有する、請求項1に記載の方法。
- 前記アスパラギン酸アミノ基転移酵素は、配列番号25に記載のアミノ酸配列を有する、請求項1に記載の方法。
- 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クムである、請求項1に記載の方法。
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