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    • 2. 发明授权
    • Increased lysine production by gene amplification using coryneform bacteria
    • 通过使用棒状细菌的基因扩增增加赖氨酸生产
    • US06927046B1
    • 2005-08-09
    • US09722441
    • 2000-11-28
    • Paul D. HankeLhing-Yew Li-D'EliaHolly J. WalshCorey M. CraftonP. John Rayapati
    • Paul D. HankeLhing-Yew Li-D'EliaHolly J. WalshCorey M. CraftonP. John Rayapati
    • C12N15/09C07K14/34C07K14/345C12N1/21C12N9/12C12N9/88C12N15/52C12N15/54C12P13/04C12P13/08C12R1/13
    • C12N9/1217C07K14/34C07K14/345C12N9/88C12N15/52C12P13/04C12P13/08
    • The invention provides methods to increase the production of an amino acid from Corynebacterium species by way of the amplification of amino acid biosynthetic pathway genes in a host cell chromosome. In a preferred embodiment, the invention provides methods to increase the production of L-lysine in Corynebacterium glutamicum by way of the amplification of L-lysine biosynthetic pathway genes in a host cell chromosome. The invention also provides novel processes for the production of an amino acid by way of the amplification of amino acid biosynthetic pathway genes in a host cell chromosome and/or by increasing promoter strength. In a preferred embodiment, the invention provides processes to increase the production of L-lysine in Corynebacterium glutamicum by way of the amplification of L-lysine biosynthetic pathway genes in a host cell chromosome. The invention also provides novel isolated nucleic acid molecules for L-lysine biosynthetic pathway genes of Corynebacterium glutamicum such as a naturally occurring, feedback-sensitive form of aspartokinase (ask) resulting from a threonine to isoleucine mutation at amino acid residue 380 in the ask gene of ATCC 21529, aspartate-semialdehyde dehydrogenase (asd), dihydrodipicolinate synthase (dapA), dihydrodipicolinate reductase (dapB), diaminopimelate dehydrogenase (ddh), and diaminopimelate decarboxylase (lysA).
    • 本发明提供了通过在宿主细胞染色体中扩增氨基酸生物合成途径基因来增加棒状杆菌属物种的氨基酸生产的方法。 在优选的实施方案中,本发明提供了通过在宿主细胞染色体中扩增L-赖氨酸生物合成途径基因来增加谷氨酸棒杆菌中L-赖氨酸生产的方法。 本发明还提供了通过在宿主细胞染色体中扩增氨基酸生物合成途径基因和/或通过增加启动子强度来生产氨基酸的新方法。 在优选的实施方案中,本发明提供了通过在宿主细胞染色体中扩增L-赖氨酸生物合成途径基因来增加谷氨酸棒杆菌中L-赖氨酸生产的方法。 本发明还提供了用于谷氨酸棒杆菌的L-赖氨酸生物合成途径基因的新型分离的核酸分子,例如在询问基因中的氨基酸残基380处的苏氨酸至异亮氨酸突变引起的天然存在的反馈敏感形式的天冬氨酸激酶(ask) (dapA),二氢吡啶二羧酸还原酶(dapB),二氨基庚二酸脱氢酶(ddh)和二氨基庚二酸脱羧酶(lysA)的天冬氨酸 - 半醛脱氢酶(asd),二氢吡啶二羧酸合酶(dapA)。
    • 3. 发明授权
    • Regulation of carbon assimilation
    • 碳同化调控
    • US06919190B2
    • 2005-07-19
    • US09978698
    • 2001-10-18
    • P. John RayapatiCorey M. Crafton
    • P. John RayapatiCorey M. Crafton
    • C12N9/88C12P13/08C12P13/04C07H21/04C12N1/20
    • C12N9/88C12P13/08
    • The present invention provides a method of increasing the productivity of a microorganism by improving the assimilation of carbon dioxide. Specifically, the invention provides a polypeptide having phosphoenolpyruvate carboxylase activity which does not require acetyl coenzyme A for activation and is desensitized to feedback inhibition by aspartic acid, and to genes coding for this polypeptide. A gene encoding a PEP carboxylase that is not regulated by acetyl-CoA or aspartic acid can improve carbon flow from the three carbon intermediate PEP to the four carbon intermediate OAA, contribute to compounds derived from OAA, and increase amino acid biosynthesis. The invention further provides recombinant DNA molecules containing these genes, bacteria transformed with these genes, and a method of producing amino acids using the transformed bacteria.
    • 本发明提供了通过改善二氧化碳的同化来提高微生物的生产率的方法。 具体地,本发明提供了具有磷酸烯醇丙酮酸羧化酶活性的多肽,其不需要乙酰辅酶A用于激活,并且对天冬氨酸的反馈抑制脱敏,以及编码该多肽的基因。 编码不受乙酰辅酶A或天冬氨酸调节的PEP羧化酶的基因可以改善从三碳中间体PEP到四碳中间体OAA的碳流动,有助于衍生自OAA的化合物,并增加氨基酸生物合成。 本发明还提供含有这些基因的重组DNA分子,用这些基因转化的细菌,以及使用转化细菌产生氨基酸的方法。
    • 5. 发明授权
    • Metabolic engineering of amino acid production
    • 氨基酸生产代谢工程
    • US07635579B2
    • 2009-12-22
    • US11978908
    • 2007-10-30
    • P. John RayapatiCorey M. Crafton
    • P. John RayapatiCorey M. Crafton
    • C12P13/04C12P13/08C12N15/74C12N1/20
    • C12N15/01C12N9/88C12P13/04C12P13/08
    • The present invention is directed towards the fermentative production of amino acids, providing microorganisms, methods and processes useful therefor. Microorganisms of the invention are capable of converting glucose to amino acids other than L-isoleucine, L-leucine and L-valine with greater efficiency than the parent strain. The efficiency of conversion may be quantified by the formula: [(g amino acid produced/g dextrose consumed)*100]=% Yield and expressed as yield from dextrose. The invention provides microorganisms that are made auxotrophic or bradytrophic for the synthesis of one or more branched chain amino acids by mutagenesis and selected for their ability to produce higher percent yields of the desired amino acid than the parental strain. Preferred microorganisms are Corynebacterium, Brevibacterium or Escherichia coli producing L-lysine. Mutagenesis is performed by classical techniques or through rDNA methodology. Methods of the invention are designed to increase the production of an amino acid by mutagenizing a parental strain, selecting cells auxotrophic or bradytrophic for the synthesis of one or more branched chain amino acids and selecting branched chain amino acid auxotrophs or bradytrophs that produce a higher percent yield from dextrose of the desired amino acid than the parental strain. Processes of the invention are designed for the production an amino acid comprising culturing in a medium a microorganism obtained by mutagenizing a parent strain to be auxotrophic or bradytrophic for branched chain amino acid synthesis and selecting variants that are capable of converting glucose to amino acids other than L-isoleucine, L-leucine and L-valine with greater efficiency than the parent strain.
    • 本发明涉及氨基酸的发酵生产,提供微生物,对其有用的方法和方法。 本发明的微生物能够以比亲本菌株更高的效率将葡萄糖转化成L-异亮氨酸,L-亮氨酸和L-缬氨酸以外的氨基酸。 转化效率可以通过以下公式进行定量:[(g氨基酸产生/ g葡萄糖消耗)* 100] =%产率并以葡萄糖的收率表示。 本发明提供了通过诱变合成一种或多种支链氨基酸产生营养缺陷型或营养缺陷型微生物,并且选择其产生比亲本菌株更高产率的所需氨基酸的能力。 优选的微生物是产生L-赖氨酸的棒状杆菌,短杆菌或大肠杆菌。 诱变通过经典技术或通过rDNA方法进行。 本发明的方法被设计成通过诱变亲本菌株来增加氨基酸的产生,选择营养缺陷型或营养型细胞用于合成一种或多种支链氨基酸并选择产生更高百分比的支链氨基酸营养缺陷型或营养缺陷型 来自所需氨基酸的葡萄糖的产量高于亲本菌株。 本发明的方法被设计用于生产氨基酸,其包括在培养基中培养通过将亲本菌株诱变为营养缺陷型或营养型的支链氨基酸合成获得的微生物,并选择能够将葡萄糖转化成除了氨基酸以外的氨基酸的变体 L-异亮氨酸,L-亮氨酸和L-缬氨酸,其效力高于亲本菌株。