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    • 8. 发明公开
    • MUTANT MICROORGANISM HAVING IMPROVED PRODUCTION ABILITY OF BRANCHED AMINO ACID AND METHOD FOR PREPARING BRANCHED AMINO ACID USING THE SAME
    • 支链氨基酸提高生产能力的突变微生物及用其制备支链氨基酸的方法
    • EP2038403A1
    • 2009-03-25
    • EP07715659.4
    • 2007-03-14
    • Korea Advanced Institute of Science and Technology
    • LEE, Sang YupPARK, Jin HwanLEE, Kwang HoKIM, Tae Yong
    • C12N1/16
    • C12P13/08C12N9/1014C12Y201/02011
    • The present invention relates to mutant microorganisms having improved productivity of branched-chain amino acids, and a method for producing branched-chain amino acids using the mutant microorganisms. More specifically, relates to mutant microorganisms having improved productivity of L-valine, which are produced by attenuating or deleting a gene encoding an enzyme involved in L-isoleucine biosynthesis, a gene encoding an enzyme involved in L-leucine, and a gene encoding an enzyme involved in D-pantothenic acid biosynthesis, and mutating a gene encoding an enzyme involved in L-valine biosynthesis, such that the expression thereof is increased, as well as a method for producing L-valine using the mutant microorganisms. The inventive mutant microorganisms produced by site- specific mutagenesis and metabolic pathway engineering can produce branched-chain amino acids, particularly L-valine, with high efficiency, and thus will be useful as industrial microorganisms for producing L-valine.
    • 本发明涉及具有提高的支链氨基酸生产率的突变微生物以及使用该突变微生物生产支链氨基酸的方法。 更具体地,涉及通过减弱或缺失编码参与L-异亮氨酸生物合成的酶的基因,编码参与L-亮氨酸的酶的基因和编码L-异亮氨酸生物合成酶的基因而产生的L-缬氨酸的生产率提高的突变微生物 参与D-泛酸生物合成的酶,以及编码参与L-缬氨酸生物合成的酶的基因的突变,从而增加其表达,以及使用该突变体微生物生产L-缬氨酸的方法。 通过位点特异性诱变和代谢途径工程产生的本发明的突变微生物可高效生产支链氨基酸,特别是L-缬氨酸,因此可用作生产L-缬氨酸的工业微生物。