MODIFIED PROTEIN HAVING ALPHA1,2-FUCOSYLTRANSFERASE ACTIVITY AND METHOD FOR PRODUCING FUCOSE-CONTAINING CARBOHYDRATE

    公开(公告)号:US20240318213A1

    公开(公告)日:2024-09-26

    申请号:US18547082

    申请日:2022-02-18

    CPC classification number: C12P19/00 C12N9/1051 C12P19/18

    Abstract: An object of the present invention is to provide a modified protein having an α1,2-fucosyltransferase activity and a method for producing a fucose-containing carbohydrate using the protein or a microorganism having an ability to produce the protein. According to the present invention, a fucose-containing carbohydrate such as 2′-fucosyllactose can be more efficiently produced by using a protein having an α1,2-fucosyltransferase activity and being modified to substitute a specific amino acid residue with another amino acid residue, or a microorganism having the protein or an ability to produce the protein, compared to the case of using a wild-type protein having an α1,2-fucosyltransferase activity, or a microorganism having the protein or an ability to produce the protein.

    GLYCOSYLTRANSFERASE MUTANT, AND METHOD FOR CATALYTIC SYNTHESIS OF REBAUDIOSIDE M USING GLYCOSYLTRANSFERASE MUTANT

    公开(公告)号:US20240287479A1

    公开(公告)日:2024-08-29

    申请号:US18574052

    申请日:2022-07-29

    CPC classification number: C12N9/1051 C12N9/1062 C12N15/70 C12P19/18 C12Y204/01

    Abstract: A glycosyltransferase mutant and a method for catalytic synthesis of rebaudioside M using the glycosyltransferase mutant are provided. The glycosyltransferase mutant is obtained through mutation based on a glycosyltransferase amino acid sequence shown in SEQ ID NO: 1, and can be produced by inducing expression in a mutant strain. The glycosyltransferase mutant can be used as a catalyst for enzymatic catalytic synthesis of 12.8 g/LRebM from 20 g/LRebE. Michaelis constants (a kinetic parameter) of the glycosyltransferase mutant S195Q for rebaudioside E and rebaudioside D are 56.34±2.02 μM and 214.48±14.54 μM, respectively, which are ⅓ and ⅖ of a Michaelis constant of a wild-type (WT) glycosyltransferase, respectively. The glycosyltransferase mutant can be coupled with sucrose synthase (SuSy) to allow the catalytic synthesis of rebaudioside M and a recombinant strain in which a glycosyltransferase UGT76G1 or a mutant thereof is co-expressed with SuSy is constructed to allow the catalytic synthesis of rebaudioside M.

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