JP5553354B2 - エステラーゼの調製 - Google Patents
エステラーゼの調製 Download PDFInfo
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- JP5553354B2 JP5553354B2 JP2010514010A JP2010514010A JP5553354B2 JP 5553354 B2 JP5553354 B2 JP 5553354B2 JP 2010514010 A JP2010514010 A JP 2010514010A JP 2010514010 A JP2010514010 A JP 2010514010A JP 5553354 B2 JP5553354 B2 JP 5553354B2
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Classifications
-
- C—CHEMISTRY; METALLURGY
- C12—BIOCHEMISTRY; BEER; SPIRITS; WINE; VINEGAR; MICROBIOLOGY; ENZYMOLOGY; MUTATION OR GENETIC ENGINEERING
- C12N—MICROORGANISMS OR ENZYMES; COMPOSITIONS THEREOF; PROPAGATING, PRESERVING, OR MAINTAINING MICROORGANISMS; MUTATION OR GENETIC ENGINEERING; CULTURE MEDIA
- C12N9/00—Enzymes; Proenzymes; Compositions thereof; Processes for preparing, activating, inhibiting, separating or purifying enzymes
- C12N9/14—Hydrolases (3)
- C12N9/16—Hydrolases (3) acting on ester bonds (3.1)
- C12N9/18—Carboxylic ester hydrolases (3.1.1)
-
- C—CHEMISTRY; METALLURGY
- C12—BIOCHEMISTRY; BEER; SPIRITS; WINE; VINEGAR; MICROBIOLOGY; ENZYMOLOGY; MUTATION OR GENETIC ENGINEERING
- C12N—MICROORGANISMS OR ENZYMES; COMPOSITIONS THEREOF; PROPAGATING, PRESERVING, OR MAINTAINING MICROORGANISMS; MUTATION OR GENETIC ENGINEERING; CULTURE MEDIA
- C12N15/00—Mutation or genetic engineering; DNA or RNA concerning genetic engineering, vectors, e.g. plasmids, or their isolation, preparation or purification; Use of hosts therefor
- C12N15/09—Recombinant DNA-technology
- C12N15/63—Introduction of foreign genetic material using vectors; Vectors; Use of hosts therefor; Regulation of expression
- C12N15/70—Vectors or expression systems specially adapted for E. coli
-
- C—CHEMISTRY; METALLURGY
- C12—BIOCHEMISTRY; BEER; SPIRITS; WINE; VINEGAR; MICROBIOLOGY; ENZYMOLOGY; MUTATION OR GENETIC ENGINEERING
- C12Y—ENZYMES
- C12Y301/00—Hydrolases acting on ester bonds (3.1)
- C12Y301/01—Carboxylic ester hydrolases (3.1.1)
- C12Y301/01001—Carboxylesterase (3.1.1.1)
Landscapes
- Health & Medical Sciences (AREA)
- Genetics & Genomics (AREA)
- Life Sciences & Earth Sciences (AREA)
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Organic Chemistry (AREA)
- Wood Science & Technology (AREA)
- Zoology (AREA)
- Bioinformatics & Cheminformatics (AREA)
- General Engineering & Computer Science (AREA)
- Biomedical Technology (AREA)
- Biochemistry (AREA)
- General Health & Medical Sciences (AREA)
- Biotechnology (AREA)
- Molecular Biology (AREA)
- Microbiology (AREA)
- Physics & Mathematics (AREA)
- Biophysics (AREA)
- Plant Pathology (AREA)
- Medicinal Chemistry (AREA)
- Micro-Organisms Or Cultivation Processes Thereof (AREA)
- Enzymes And Modification Thereof (AREA)
Description
タンパク質配列:
Matrix:BLOSUM62
Open gap:5
extension gap:2
Penalties gap x_dropoff: 11
Expected:10
word size:11
ヌクレオチド配列:
Reward for match:1
Penalty for mismatch:−2
Open gap:11
extension gap:1
Penalties gap x_dropoff:50
Expected:10
word size:3
[実施例1]
[mRNA単離およびcDNA合成;代替えブタ肝臓エステラーゼ(APLE)同定]
地元の屠殺場から得た0.7gの新鮮なブタ肝臓を液体窒素中で凍結し、乳鉢と乳棒を使用して均質化した。米国カールズバッドのインビトロジェン(Invitrogen(Carlsbad,USA))からのファストトラック(Fast Track)(登録商標)2.0 mRNA単離キットを使用して、製造業者の使用説明書に従ってホモジェネートからmRNAを抽出した。抽出プロトコルから13μgのmRNAが生じた。米国カールズバッドのインビトロジェンからのRT−PCR用スーパースクリプト(SuperScript)TMIII ファーストストランド合成システム(First−Strand Synthesis System)を使用し、製造業者の使用説明書に従ったcDNA合成のためのテンプレートとして0.26μgのmRNAを使用した。
にEcoRI制限部位(Italics)を導入した。既知のブタ肝臓エステラーゼ/アミダーゼ配列と相同的な配列に下線を引いた。
[APLEの機能発現およびAPLE活性の特性決定]
米国カールズバッドのインビトロジェンからのベクターpPICZα中に存在するα−接合因子分泌シグナル配列との融合によって、γ−PLEおよびAPLE遺伝子の双方をピチア・パストリス(Pichia pastoris)中での分泌発現に適応させた。
プライマー、
を使用したPCR1:α−接合因子分泌シグナル配列。
プライマー、
を使用したPCR2(γ−PLE)およびPCR3(APLE)。
[合成APLE遺伝子のデザイン]
APLEをコードする遺伝子(配列番号5)に由来する成熟APLE(配列番号6)のアミノ酸配列に基づいて、コドン使用頻度の改変があり天然の分泌シグナル配列を欠く合成遺伝子をデザインして、化学的に合成した(供給元:米国メンロパークのDNA2.0)。合成APLE遺伝子変異型C8P(配列番号11)、C8A(配列番号13)、C8CpO(配列番号14)、およびC8E(配列番号15)は全て、必要とされる翻訳開始コドンとして追加的N−末端メチオニンがある成熟APLEタンパク質をコードする(配列番号12)。
遺伝子APLE C8Pのためには、以下のPCRプライマーがデザインされた。
遺伝子APLE C8Aのためには、以下のPCRプライマーがデザインされた。
遺伝子APLEC8CpOのためには、以下のPCRプライマーがデザインされた。
遺伝子APLEC8Eのためには、以下のPCRプライマーがデザインされた。
クローニングのためのNdeIおよびHindIII制限部位は斜体で表し、遺伝子テンプレートと相同的な配列には下線を引いた。
クローニングのためのNdeIおよびHindIII制限部位は斜体で表し、遺伝子テンプレートと相同的な配列には下線を引いた。
[APLE発現ベクターの適切な大腸菌(E.coli)宿主への形質転換:大腸菌(E.coli)中におけるAPLEの機能発現]
大腸菌(E.coli)中でのエステラーゼ発現を分析するため、活性分析用細胞の培養および調製のために以下の手順を使用した。
[DsbCの添加を通じたAPLE発現の増大]
同時発現される熱ショックタンパク質の影響が観察されないということで、大腸菌(E.coli)内在性ジスルフィド−イソメラーゼ遺伝子dsbCの過剰発現(Bessetteら)のようなその他の補助因子が、大腸菌(E.coli)中におけるAPLE発現に影響するかどうかを調査した。
[新しい大腸菌(E.coli)宿主株の調製およびこれらの宿主のAPLE産生特性の分析]
大腸菌(E.coli)株RV308(ATCC31608)から出発して、大腸菌(Escherichia coli)K12株RV308 ΔtrxB;Δgorを構築した。Prinzらによって述べられているのと同様に、細胞内ジスルフィド還元に関与する2つの遺伝子を不活性化した。それぞれチオレドキシン還元酵素およびグルタチオンオキシド還元酵素をコードするこれらの2つの遺伝子trxBおよびgorは、Datsenkoら(2000)[9]で述べられている手順に従って、部位特異的遺伝子組み換えを使用した欠失を通じて不活性化された。
この反応への
の適用は、遺伝子trxBの欠失カセットをもたらす。
この反応への
の適用は、遺伝子gorの欠失カセットをもたらす。
ブタ肝臓エステラーゼタンパク質の様々な天然のイソ型をコードする追加的合成遺伝子を化学的に合成した。新しいエステラーゼタンパク質生成のために、ウシγ−PLE様遺伝子を合成した。
[1] Lange S., Musidlowska A., Schmidt-Dannert C., Schmitt J.,Bornscheuer U.T. (2001) Chem BioChem 2, 576-582
[2] Boettcher, D., Bruesehaber, E., Doderer, K. and Bornscheuer,U.T. (2007) Appl. Microbiol. Biotechnol. 73, 1282-1289
[3] Prinz, W.A., Aslund, F., Holmgren, A. and Beckwith, J. (1997) J.Biol.Chem. 272: 15661-15667
[4] Beckwith, J., Aslund, F., Bessette, P.H., Georgiou, G., Ritz, D.and Lim, J. E. US patent No 6,872,563
[5] Bessette, P.H., Aslund, F., Beckwith, J. And Georgiou, G. (1999)PNAS 96 (24), 13703-13708
[6] Terpe, K. (2006) Appl. Microbiol. Biotechnol. 72, 211-222.
[7] Matsushima M, Inoue H, Ichinose M, Tsukada S, Miki K, KurokawaK, Takahashi T, Takahashi K. (1991). FEBS Lett. 293, 37-41
[8] Balzer D, Ziegelin G, Pansegrau W, Kruft V, Lanka E. (1992).Nucleic Acids Res. 20, 1851-1858
[9] Datsenko, K.A. & Wanner, B.L. (2000) PNAS 97, 6640-6645
Claims (7)
- エステラーゼ活性があるタンパク質を調製する方法であって、そのようなタンパク質をコードする遺伝子を大腸菌(E.coli)株中で発現するステップを含んでなり、エステラーゼ活性があるタンパク質をコードする前記遺伝子が、配列番号11のポリヌクレオチドと、少なくとも90%の同一性を有して、配列番号12と、少なくとも98%の同一性を有するタンパク質をコードすることで特徴づけられ、発現がプラスミドからのGroELおよび/またはGroESの同時発現なしに起きる、方法。
- 遺伝子が、配列番号12と少なくとも99%の同一性を有するタンパク質をコードする、請求項1に記載の方法。
- エステラーゼ活性があるタンパク質の調製に適した組み換え大腸菌(E.coli)株であって、前記組み換え大腸菌(E.coli)株が、エステラーゼ活性があるタンパク質をコードする遺伝子を含有し、前記遺伝子が、配列番号11のポリヌクレオチドと、少なくとも90%の同一性を有して、配列番号12と、少なくとも98%の同一性を有するタンパク質をコードすることで特徴づけられ、発現がプラスミドからのGroELおよび/またはGroESの同時発現なしに起きる、組み換え大腸菌(E.coli)株。
- グルタチオン還元酵素および/またはチオレドキシン還元酵素を発現できないことで特徴づけられる、請求項3に記載のエステラーゼ活性があるタンパク質の調製に適した組み換え大腸菌(E.coli)株。
- グルタチオン還元酵素およびチオレドキシン還元酵素の双方を発現できないことで特徴づけられる、請求項3に記載のエステラーゼ活性があるタンパク質の調製に適した組み換え大腸菌(E.coli)株。
- グルタチオン還元酵素および/またはチオレドキシン還元酵素発現が突然変異によって消滅されることで特徴づけられる、請求項3に記載のエステラーゼ活性があるタンパク質の調製に適した組み換え大腸菌(E.coli)株。
- 大腸菌(E.coli)オリガミ(Origami)1、オリガミ(Origami)2またはオリガミ(Origami)B株から得られる、請求項3〜6のいずれか一項に記載の組み換え大腸菌(E.coli)株。
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