Glucose isomerases with improved affinity for D-glucose
    2.
    发明授权
    Glucose isomerases with improved affinity for D-glucose 失效
    葡萄糖异构酶与D-葡萄糖具有改善的亲和力

    公开(公告)号:US5266475A

    公开(公告)日:1993-11-30

    申请号:US762681

    申请日:1991-09-19

    IPC分类号: C12N9/92

    CPC分类号: C12N9/92 Y10S435/842

    摘要: A genetically engineered glucose isomerase with improved affinity for D-glucose and the method of preparation of such a glucose isomerase are disclosed. The glucose isomerase is obtained by mutagenizing the gene of a naturally occurring glucose isomerase such that a smaller amino acid replaces a larger amino acid in the catalytic site. In an especially advantageous embodiment of the present invention, the Clostridium glucose isomerase sequence is mutated and the residue replaced with a smaller amino acid is either Trp.sub.139 or Val.sub.186.

    摘要翻译: 公开了对D-葡萄糖具有改善的亲和力的遗传工程化葡萄糖异构酶和制备这种葡萄糖异构酶的方法。 葡萄糖异构酶通过诱变天然存在的葡萄糖异构酶的基因而得到,使得较小的氨基酸代替催化位点中较大的氨基酸。 在本发明的一个特别有利的实施方案中,将梭菌属葡萄糖异构酶序列突变,并用较小氨基酸替代残基是Trp139或Val186。