Process for enzymatic hydrolysis of starch to glucose
    7.
    发明授权
    Process for enzymatic hydrolysis of starch to glucose 失效
    葡萄糖淀粉酶水解的方法

    公开(公告)号:US5162210A

    公开(公告)日:1992-11-10

    申请号:US546511

    申请日:1990-06-29

    CPC classification number: C12N9/2428 C12P19/20

    Abstract: A process for converting starch or partially hydrolyzed starch into a syrup containing dextrose includes the steps of saccharifying starch hydrolyzate in the presence of a saccharifying starch hydrolyzate in the presence of a mutated glucoamylase or related enzyme and increasing the selectivity of the enzyme for .alpha.-(1.fwdarw.4)-glucosidic bonds by the glucoamylase or related enzyme by including at least one mutation, the mutation substituting an amino acid of the enzyme with at least one amino acid chosen by comparison with structurally related regions of other enzymes that selectively hydrolyze only .alpha.-(1.fwdarw.4) glucosidic bonds.Enzymes made in accordance with the present invention are also disclosed.

    Abstract translation: 将淀粉或部分水解淀粉转化为含葡萄糖的糖浆的方法包括以下步骤:在糖化淀粉水解产物存在下,在突变葡糖淀粉酶或相关酶存在下糖化淀粉水解产物,并增加酶对α-( 通过包括至少一个突变的葡糖淀粉酶或相关酶的1-> 4) - 葡糖苷键,将所述酶的氨基酸用至少一个氨基酸进行突变,所述氨基酸通过与仅选择性水解的其它酶的结构相关区域进行比较而选择 α-(1-> 4)糖苷键。 还公开了根据本发明制备的酶。

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