Method for microbially producing L-valine
    13.
    发明授权
    Method for microbially producing L-valine 失效
    微生物生产L-缬氨酸的方法

    公开(公告)号:US07632663B1

    公开(公告)日:2009-12-15

    申请号:US09914006

    申请日:2000-02-21

    CPC classification number: C12N9/93 C12N9/1014 C12N9/88 C12P13/06

    Abstract: The present invention relates to a process for the microbial production of L-valine in which the dihydroxy acid-synthase (ilvD) activity and/or the ilvD gene expression is intensified in a microorganism. As an alternative or in combination with this, the acetohydroxy acid-synthase (ilvBN) activity and isomeroreductase (ilvC) activity and/or the ilvBNC gene expression are intensified in a microorganism. The process according to the invention preferably makes use of microorganisms in which the activity of at least one enzyme that is involved in a metabolic pathway that reduces the formation of L-valine is weakened or eliminated. Thus, for instance, the process according to the invention preferably makes use of microorganisms having a defect mutation in the threonine dehydratase (ilvA) gene and/or a defect mutation in one or more genes of the pantothenate synthesis.

    Abstract translation: 本发明涉及微生物生产L-缬氨酸的方法,其中二羟基酸合酶(ilvD)活性和/或ilvD基因表达在微生物中增强。 作为替代或与其结合,在微生物中增强乙酰羟酸合酶(ilvBN)活性和异构还原酶(ilvC)活性和/或ilvBNC基因表达。 根据本发明的方法优选利用其中减少或消除了减少L-缬氨酸形成的参与代谢途径的至少一种酶的活性的微生物。 因此,例如,根据本发明的方法优选利用在苏氨酸脱水酶(ilvA)基因中具有缺陷突变的微生物和/或泛酸合成的一种或多种基因中的缺陷突变。

    PROCESS FOR PREPARING METHACRYLIC ACID OR METHACRYLIC ESTERS
    20.
    发明申请
    PROCESS FOR PREPARING METHACRYLIC ACID OR METHACRYLIC ESTERS 有权
    制备甲基丙烯酸或甲基丙烯酸酯的方法

    公开(公告)号:US20100291644A1

    公开(公告)日:2010-11-18

    申请号:US12602593

    申请日:2008-05-30

    Abstract: The present invention relates to a process for the preparation of methacrylic acid or methacrylic esters, comprising the process steps of IA) preparation of 3-hydroxyisobutyric acid by a process comprising the process step of bringing a cell which has been genetically modified in comparison with its wild type in such a way that it is capable of forming more 3-hydroxyisobutyric acid, or polyhydroxyalkanoates based on 3-hydroxyisobutyric acid in comparison with its wild type, into contact with a nutrient medium comprising, as carbon source, carbohydrates, glycerol, carbon dioxide, methanol, L-valine or L-glutamate under conditions under which 3-hydroxyisobutyric acid or polyhydroxyalkanoates based on 3-hydroxyisobutyric acid are formed from the carbon source, if appropriate, isolation of the 3-hydroxyisobutyric acid from the nutrient medium and also, if appropriate, neutralization of the 3-hydroxyisobutyric acid, IB) dehydration of the 3-hydroxyisobutyric acid with formation of methacrylic acid and also, where appropriate, esterification methacrylic acid. The invention also relates to a process for the preparation of polymethacrylic acid or polymethacrylic esters.

    Abstract translation: 本发明涉及一种制备甲基丙烯酸或甲基丙烯酸酯的方法,其包括以下工艺步骤:IA)通过包括以下步骤的方法制备3-羟基异丁酸,所述方法包括将经遗传修饰的细胞与其 野生型,使得其能够形成更多的3-羟基异丁酸或与其野生型相比基于3-羟基异丁酸的聚羟基链烷酸酯与营养培养基接触,所述营养培养基包含作为碳源的碳水化合物,甘油,碳 二氧化物,甲醇,L-缬氨酸或L-谷氨酸盐,其中3-羟基异丁酸或基于3-羟基异丁酸的聚羟基链烷酸酯由碳源形成的条件下,如果合适,则从营养培养基中分离出3-羟基异丁酸, 如果适当,中和3-羟基异丁酸,IB)3-羟基异丁酸脱水形成甲基丙烯酸 酸,并且在适当的情况下酯化甲基丙烯酸。 本发明还涉及一种制备聚甲基丙烯酸或聚甲基丙烯酸酯的方法。

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