CLONING OF THE STREPTOMYCES AVERMITILIS GENES FOR GLYCOSYLATION OF AVERMECTIN AGLYCONES
    37.
    发明公开
    CLONING OF THE STREPTOMYCES AVERMITILIS GENES FOR GLYCOSYLATION OF AVERMECTIN AGLYCONES 审中-公开
    链霉菌基因的克隆阿维除虫菌素糖苷配基的糖基化

    公开(公告)号:EP1206477A1

    公开(公告)日:2002-05-22

    申请号:EP00950713.8

    申请日:2000-07-26

    申请人: Merck & Co., Inc.

    CPC分类号: C12N15/52

    摘要: A cluster of genes involved in the synthesis and/or addition of oleandrose to avermectin aglycones has been cloned. A 11-kb PstI clone complemented 28 avermectin glycosylation mutants in seven complementation classes. Sequencing of an 10-kb region identified 9 ORFs and an additional partial ORF. Eight of the ORFs were correlated to the seven glycosylation complementation classes. Sequence comparison to Genbank databases identified 6 genes: dTDP-glucose synthase; dTDP-glucose 4,6 dehydrase; dTDP-4-keto-hexose reductase; dTDP-hexose 3,5 epimerase; dTDP-hexose 3' O-methylase; and an avermectin aglycone-dTDP-oleandrose glycosyltransferase. The ninth ORF was essential for biosynthesis of the avermectin aglycones. The partial ORF encoded part of an avermectin polyketide synthase module 7.