Enzyme exhibiting alpha-1,6-glucosyl transfer activity

    公开(公告)号:US11505789B2

    公开(公告)日:2022-11-22

    申请号:US16971169

    申请日:2019-02-19

    IPC分类号: C12N9/44 C12P19/18

    摘要: The present invention relates to an enzyme having α-1,6-glucosyl transfer activity, which can use a partially degraded starch product as a substrate and is heat resistant and suitable for industrial applications; an enzyme preparation for use in manufacturing α-1,6-glucan, comprising the enzyme as an active ingredient; and a method for manufacturing α-1,6-glucan using the enzyme or enzyme preparation. The present invention provides an enzyme having α-1,6-glucosyl transfer activity, which is any one of proteins (a), (b), and (c): (a) a protein consisting of an amino acid sequence of SEQ ID NO: 3; (b) a protein consisting of an amino acid sequence having at least 90% amino acid sequence identity to the amino acid sequence of SEQ ID NO: 3; and (c) a protein consisting of an amino acid sequence in which one or several amino acid(s) have been substituted, inserted, deleted and/or added in the amino acid sequence of SEQ ID NO: 3.

    Method for efficiently expressing pullulanase in bacillus subtilis and recombinant bacillus subtilis

    公开(公告)号:US10975366B2

    公开(公告)日:2021-04-13

    申请号:US16476878

    申请日:2017-10-24

    IPC分类号: C12N9/54 C12N9/44

    摘要: The present invention relates to the field of genetic engineering, particularly to a method for efficiently expressing pullulanase in Bacillus subtilis and recombinant Bacillus subtilis. said method includes steps of constructing modified Bacillus subtilis strain with deletion of alkaline protease gene and neutral protease gene, constructing expression vector including an optimized combination of promoter and signal peptide and pullulanase gene, and transforming said modified Bacillus subtilis strain with by said expression vector. A series of combinations of promoter and signal peptide are optimized to obtain the combination for efficiently expressing pullulanase, provide an industrial application basis.