JP5432524B2 - アスパラギン酸由来アミノ酸および化学物質の改善された生産のための改変グリオキシル酸シャント - Google Patents
アスパラギン酸由来アミノ酸および化学物質の改善された生産のための改変グリオキシル酸シャント Download PDFInfo
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- C—CHEMISTRY; METALLURGY
- C12—BIOCHEMISTRY; BEER; SPIRITS; WINE; VINEGAR; MICROBIOLOGY; ENZYMOLOGY; MUTATION OR GENETIC ENGINEERING
- C12P—FERMENTATION OR ENZYME-USING PROCESSES TO SYNTHESISE A DESIRED CHEMICAL COMPOUND OR COMPOSITION OR TO SEPARATE OPTICAL ISOMERS FROM A RACEMIC MIXTURE
- C12P13/00—Preparation of nitrogen-containing organic compounds
- C12P13/04—Alpha- or beta- amino acids
- C12P13/08—Lysine; Diaminopimelic acid; Threonine; Valine
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- C12—BIOCHEMISTRY; BEER; SPIRITS; WINE; VINEGAR; MICROBIOLOGY; ENZYMOLOGY; MUTATION OR GENETIC ENGINEERING
- C12P—FERMENTATION OR ENZYME-USING PROCESSES TO SYNTHESISE A DESIRED CHEMICAL COMPOUND OR COMPOSITION OR TO SEPARATE OPTICAL ISOMERS FROM A RACEMIC MIXTURE
- C12P13/00—Preparation of nitrogen-containing organic compounds
- C12P13/04—Alpha- or beta- amino acids
- C12P13/06—Alanine; Leucine; Isoleucine; Serine; Homoserine
-
- C—CHEMISTRY; METALLURGY
- C12—BIOCHEMISTRY; BEER; SPIRITS; WINE; VINEGAR; MICROBIOLOGY; ENZYMOLOGY; MUTATION OR GENETIC ENGINEERING
- C12P—FERMENTATION OR ENZYME-USING PROCESSES TO SYNTHESISE A DESIRED CHEMICAL COMPOUND OR COMPOSITION OR TO SEPARATE OPTICAL ISOMERS FROM A RACEMIC MIXTURE
- C12P13/00—Preparation of nitrogen-containing organic compounds
- C12P13/04—Alpha- or beta- amino acids
- C12P13/12—Methionine; Cysteine; Cystine
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Description
本出願は、係属中の米国仮特許出願第60/692,341号(出願日2005年6月20日)への優先権を主張する。上記出願は、あたかも本明細書に完全に再記載されているかのように参考として援用される。
以下には、本発明を理解するのに有用な場合がある情報が含まれる。但し、本明細書に提供される情報の何れかが、本明細書において記載又は請求される発明の従来技術又は材料であることも、或いは具体的又は暗示的に言及される何れかの刊行物又は文書が従来技術であることも認めることはない。
aceB、リンゴ酸シンターゼA:アセチル−CoA+H2O+グリコキシレート<・・・>リンゴ酸塩+CoA
glcB、リンゴ酸シンターゼG:アセチル−CoA+H2O+グリコキシレート<・・・>リンゴ酸塩+CoA
大腸菌では、グリオキシル酸シャント酵素をコードする遺伝子は、aceBAKオペロンに位置する。遺伝子は、例えば、IclR(A. Sunnarborgら、J. Bact., 172:2642−2649 (1990))、FadR(S. Maloyら、J. Bact. 148:83−90 (1981))、FruR(A. Chiaら、J. Bact., 171:2424−2434 (1989))、及びArcAB(S. Iuchiら、J. Bact., 171:868−873 (1989))を含めて、幾つかの転写調節因子によって制御されると言われる。
g. Biotechnol. 48:29−52 (1993); Funkhouser, J.D. and Smith, W.D., Monovalent Cation Effects on Lysine−sensitive Aspartokinase Catalytic Activity and Allosteric Regulation. J. Biol. Chem. 249:7580−7583 (1974); Chassagnole, C.ら、Control of threonine−synthesis pathway in Escherichia coli: a theoretical and experimental approach. Biochem. J. 356:433−444 (2001); Rais, B.ら、Biochem. J. 356:425−432 (2001); Escherichia coli and Salmonella cellular and molecular biology, Neidhardtら、eds., American Society of Microbiology Press, Washington, D.C. (1996); de Boer, H.A.ら、The tac promoter: a functional hybrid derived from the trp and lac promoters. Proc. Natl. Acad. Sci. 80:21−25 (1983); Hawley, D.K. and McClure, W.R., Compilation and analysis of Escherichia coli promoter DNA sequences. Nucleic Acids Res. 11:2237−2255 (1983); Khlebnikov A. and Keasling, J.D., Effect of lacY expression on homogeneity of induction from the Ptac and Ptrc promoters by natural and synthetic inducers. Biotechnol. Prog. l8:672−674 (2002); Mulligan, M.E.ら、Characterization in vitro of the effect of spacer length on the activity of Escherichia coli RNA polymerase at the tac promoter. J. Biol. Chem. 260:3529−3538 (1985); Chung, T.ら、Glyoxylate Bypass Operon of Escherichia coli Cloning and Determination of the Functional Map. J. Bact. 170:386−392 (1987); Jurgen Brosiusら、Spacing of the −10 and −35 regions in the tac promoter. J. Biol. Chem. 260:3539−3541 (1985); Jensen, P.R., and Hammer, K., Artificial promoter for metabolic optimization. Biotechnol. Bioeng. 58:191−195 (1998); Patek, M.ら、Promoter from Corynebacterium glutamicium: cloning, molecular analysis and search for a consensus motif. Microbiol. 142:1297−1309 (1996); Shine, J. and Dalgarno, L., Determinant of cistron specificity in bacterial ribosome. Science 254:34−38 (1975); Shine, J. and Dalgarno, L., Terminal−sequence analysis of bacterial ribosomal RNA. Correlation between the 3’−terminal−polypyrimidine sequence of 16−S RNA and translational specificity of the ribosome. Eur. J. Biochem. 57:221−230 (1975); Stormo, G.D.ら、Characterization of translational initiation sites in E. coli. Nucleic Acids Res. 10:2971−2996 (1982); de Boer, H.A.ら、A hybrid promoter and portable Shine−Dalgrano regions in Escherichia coli. Biochem. Soc. Symp. 48:233−244 (1983); Meinicke, P.ら、Oligo kernels for datamining on biological sequences: a case study on prokaryotic translation initiation sites. BMC Bioinformatics 5:169 (2004); Barrick, D.ら、Quantitative analysis of ribosome binding sites in E. coll. Nucleic Acids Res. 22:1287−1295 (1994); de Boer, H.A.ら、The tac promoter: a functional hybrid derived from the trp and lac promoters. Proc. Natl. Acad. Sci. U.S.A. 80:21−25 (1983); Lithwick, G. and Margalit, H., Hierarchy of sequence−dependent features associated with prokaryotic translation. Genome Res. 13:2665−2673 (2003); Maloy, S.R.ら、Elevated levels of glyoxylate shunt enzymes in Escherichia coli strains constitutive for fatty acid degradation. J. Bact. 143:720−725 (1980); Ma, J.ら、Correlation between Shine−Dalgarno sequence and gene features such as predicted expression levels and operon structures. J. Bact. 184:5733−5745 (2002); Datsenko, K.A. and B.L. Wanner, One step inactivation of chromosomal genes in Escherichia coli K−12 using PCR products. PNAS 97:6640−6645 (2000); Ornston, L.N. and M.K. Ornston, Regulation of glyoxylate metabolism in Escherichia coli K−12. J. Bact. 98:1098−1108 (1969); Alexeyev, M.F.ら、Improved antibiotic−resistance gene cassettes and omega elements for Escherichia coli vector construction and in vitro deletion/insertion mutagenesis. Gene 160:63−67 (1995); Cremer, J.ら、Regulation of enzymes of lysine Biosynthesis in Corynebacterium glutamicum. J. Gen. Micro 134:3221−3229 (1988); Blattnerら、The Complete genome sequence of Escherichia coli K−12. Science 277:1453−1474 (1997)。
本明細書に記載及び請求される本発明は、多くの属性を有し、この概要において述べられるものを非限定的に含めて、多くの実施形態を含む。本明細書に記載及び請求される本発明は、単に例示であって、限定を目的とせずに含まれているこの概要において識別される特徴又は実施形態に限定されず、或いはそれによって限定されるものではない。
a)配列番号3、5、8からなる群から選択されるタンパク質をコードするDNA;
b)配列番号9、配列番号19、配列番号20、配列番号21、配列番号22、配列番号23、配列番号24、及び配列番号25の少なくとも1つによる核酸;
c)b)による核酸の遺伝子コードに関してのみ縮重している核酸;
d)a)又はb)による核酸の非表現突然変異を含む核酸;
e)b)の核酸と少なくとも80%、好ましくは少なくとも90%、より好ましくは少なくとも95%同一である核酸;及び
f)b)によるDNAとストリンジェントな条件下でハイブリダイズする核酸
の少なくとも1つを含む、組換え核酸を含む。
以下で考察する通り、本発明は、アスパラギン酸由来のアミノ酸及び化学物質を生成するための微生物菌株処理向上特性を提供する。このような菌株を作製する方法が提供される。これらの方法は、aceBAKオペロン、aceA遺伝子、aceB遺伝子、glcB遺伝子、又はその組み合わせの発現を変化させることを含む。発現の変化は、転写の増大、及び/又は天然転写制御の軽減により達成される場合がある。これらの遺伝子の天然プロモーターの置換も考慮される。例えば、その天然プロモーターが、tacプロモーター(Ptac)によって置換される場合がある。ベクターを含めて、本発明の新規の特徴を提供する遺伝子構築物も提供され、このようなベクターは、プラスミド、コスミド、ウィルス、ファージ、トランスポゾン、又は微小染色体である場合があるが、これらに限定されない。
本明細書で使用される特定の用語は、当業者によって使用され、このような者によって一般的に理解される通常の意味を有する。このような通常の意味の最も完全な範囲が、本明細書に包含されるものとして意図される。しかし、本明細書及び特許請求の範囲の用語に与えられる範囲を含め、これらの文書に対する理解を明確且つ一貫したものにするために、以下の定義が提供される。本明細書で提供される定義と競合する場合がある意味が主張された場合は、提供した定義が優先される。“a”又は“an”の冠詞を伴う実体は、その実体の1つ以上を指すことに留意されたい。例えば、“a polynucleotide”という表現は、1つ以上のポリヌクレオチドを表すものとして理解される。従って、“a”、“an”、「1つ以上(one or more)」、及び「少なくとも1つ(at least one)」は、本明細書において交換可能に使用することができる。
本発明の態様は、1つ以上のアミノ酸を過剰生成する細胞を生成する方法、並びにそれらの方法によって生成された細胞、それらの細胞の子孫、及び同様の特徴を有する細胞の両方を含む。本発明は、L−スレオニンの生成の文脈において本明細書では考察されるが、本発明の方法、菌株、及び構成は、非限定的にL−メチオニン、L−イソロイシン、L−ホモセリン、及びL−リシンを含めて、アスパラギン酸塩から誘導された他のアミノ酸又は化学物質を生成するために使用される場合がある。
別の態様において、本発明は、天然ではない少なくとも1つのプロモーターに操作可能に結合された、glcB遺伝子、aceA遺伝子、及び/又はaceB遺伝子等、大腸菌aceBAKオペロン及び/又はオペロンの少なくとも一部を含むDNA構築物(例えば、ベクター)を含む。本発明のDNA構築物は、lacリボソーム結合部位等、含まれている遺伝子の天然大腸菌遺伝子リボソーム結合部位ではないリボソーム結合部位を更に含む場合がある。本発明のDNA構築物は、当業者に既知の他の調節要素又は追加のDNA要素を含む場合がある。
本発明は又、全般的にアミノ酸を生成する発酵プロセスにおいて上述され、且つ以下において請求される菌株及び宿主細胞を使用することも対象とする。このようなアミノ酸は、アスパラギン酸塩ファミリのアミノ酸を含む場合がある。スパラギン酸塩ファミリのアミノ酸は、例えば、L−スレオニン、L−メチオニン、L−イソロイシン、L−ホモセリン、及びL−リシンを含む場合がある。アミノ酸は、例えば、少なくとも1つの炭素供給源、少なくとも1つの窒素供給源、及び適切であれば無機塩、成長因子等を含む合成媒地又は天然媒地において本発明の菌株又は宿主細胞を培養することによって得られる場合がある。
3. BTY2(1.0g/LのK2HPO4、10.0g/Lの(NH4)2SO4、40.8g/LのBis−Tris、15 g/Lの酵母エキス(Difco)、32.5g/Lのショ糖、及び1.2g/LのMgSO4−7H2O pH7.0)
3. BTC3(1.0g/LのK2HPO4、10.0g/Lの(NH4)2SO4、40.8g/LのBis−Tris、20m1/1の50%固体コーンスティープリカー(Sigma)、25.0g/Lのショ糖、及び1.2g/LのMgSO4−7H2O、pH7.0で、必要であればアミノ酸供給源(通常は0.1%カザミノ酸(w/v)又は1.5%酵母エキス(w/v))が補足されている。
以下の実施例は、本発明の幾つかの態様を単に代表するものである。当業者であれば、本明細書に記載の通り、本発明を種々の微生物及びプロモーターで実施できることを理解するであろう。本明細書で使用されるこれらの実施例及び菌株は、特許請求の範囲で明示的に言及していない何れかの方式で本発明を限定するものとして解釈してはならない。
実施例1は、aceBAKオペロンの遺伝子の発現を増大させる方式で、aceBの上流の位置にtacプロモーターを挿入することによって、リンゴ酸シンターゼ及びイソクエン酸リアーゼを過剰生成する菌株を生成することを記載する。
以下の実施例では、glcB遺伝子産物の発現を増大させるように配置された大腸菌のglcBの上流にtacプロモーターを導入することによってリンゴ酸シンターゼを過剰生成する菌株の生成を説明する。
以下の実施例では、glcB及びaceBAK遺伝子産物を構成的に過剰発現するように配置された大腸菌のglcBの上流及びaceBAKオペロンの上流にtacプロモーターを導入することによって、リンゴ酸シンターゼ及びイソクエン酸リアーゼを過剰生成する菌株の生成を説明する。
以下の実施例は、構成的に高レベルのグリオキシル酸シャント酵素を提供するために、glcB及びaceBAKオペロンの上流にtacプロモーターを配置して、発現を駆動する使用法を示す。
以下の実施例は、スレオニンの収率及びスレオニン生成菌株における力価を増大させるために、グリオキシル酸シャントの酵素を過剰発現させる有用性を示す。
実施例6は、大腸菌の天然glcBプロモーターに操作可能に結合されたlacプロモーターを含むプラスミドを導入することによってリンゴ酸シンターゼGを過剰生成する菌株の生成を含む。実施例6は、予測的な実施例である。実施例6の実験及び手順は実施されておらず、単に例示的なものとして意図される。
Claims (11)
- 発酵によってL−アミノ酸産物を生成するためのプロセスであって、
(a)該L−アミノ酸を生成し、aceBAKオペロン内の遺伝子及びglcB遺伝子からなる群から選択される少なくとも1つの遺伝子を細菌において過剰発現するように操作可能に構成された組換え核酸構築物を含む該細菌を、発酵培地において増殖させる工程;
(b)該発酵培地及び該細菌の少なくとも一方において該L−アミノ酸を富化させる工程;並びに
(c)該L−アミノ酸を該発酵培地及び該細菌の少なくとも一方から単離する工程を含み、
ここで、該細菌が寄託番号NRRLB−30844を有する菌株である、プロセス。 - 前記組換え核酸が、前記aceBAKオペロンに対して非天然であるプロモーター配列を含む、請求項1に記載のプロセス。
- 前記プロモーターが、tacプロモーターである、請求項2に記載のプロセス。
- 前記少なくとも1つの遺伝子が、aceBである、請求項2に記載のプロセス。
- 前記非天然プロモーターが、前記aceBAKオペロンの天然プロモーターと置き換わり、該天然プロモーターが中断される、請求項2に記載のプロセス。
- 前記非天然プロモーターが、前記aceBAKオペロンの天然プロモーターを欠失することなく挿入される、請求項2に記載のプロセス。
- 前記L−アミノ酸が、L−スレオニンである、請求項1に記載のプロセス。
- aceBAKオペロン内の遺伝子及びglcB遺伝子からなる群から選択される少なくとも1つの遺伝子を細菌において過剰発現するように操作可能に構成された組換え核酸を含む細菌であって、
ここで、該細菌が寄託番号NRRLB−30844を有する菌株である、細菌。 - 前記組換え核酸が、前記少なくとも1つの遺伝子の上流に操作可能に連結された前記aceBAKオペロンに対して非天然であるプロモーター配列を含む、請求項8に記載の細菌。
- 前記非天然プロモーターが、tacプロモーターである、請求項9に記載の細菌。
- 前記aceBAKオペロンの天然プロモーターが、前記非天然プロモーターによって置き換えられる、請求項9に記載の細菌。
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- 2006-06-20 EP EP06773537.3A patent/EP1899472B1/en active Active
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CN103497979B (zh) | 2018-09-11 |
JP5980580B2 (ja) | 2016-08-31 |
WO2007001982A1 (en) | 2007-01-04 |
EP1899472A1 (en) | 2008-03-19 |
US8187842B2 (en) | 2012-05-29 |
EP1899472A4 (en) | 2009-09-23 |
CN103497979A (zh) | 2014-01-08 |
JP2012187118A (ja) | 2012-10-04 |
JP2008543330A (ja) | 2008-12-04 |
CN101365797A (zh) | 2009-02-11 |
US20070015261A1 (en) | 2007-01-18 |
EP1899472B1 (en) | 2017-09-27 |
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