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万古霉素糖基转移酶GtfE的异源表达与体外活性检测

Heterologous expression and in vitro activity of vancomycin glycosyltransferase GtfE

  • 摘要: 为了得到具有糖基转移酶活性的重组蛋白,从万古霉素产生菌总DNA中克隆万古霉素糖基转移酶基因gtfE,连入pET-37b构建表达质粒并转入大肠杆菌BL21(DE3)表达,体外测定纯化后的重组蛋白糖基转移酶活性,用HPLC和ESI-MS检测反应产物。结果表明,重组蛋白具有预期活性,可以催化尿苷二磷酸葡萄糖与万古霉素苷元的糖基化反应。本研究为获得糖基多样性的万古霉素奠定理论基础。

     

    Abstract: Recombinant protein of vancomycin glycosyltransferase, GtfE, was obtained by gene cloning and hete-rologous expression. Gene gtfE was amplified from the genomic DNA of vancomycin producing strain and ligated into expression vector pET-37b, the recombinant plasmid GtfE/pET-37b was transformed into E. coli BL21(DE3). The product of in vitro glucosylation reaction catalyzed by purified GtfE was isolated and identified by HPLC and ESI-MS, respectively. The assay indicated that the recombinant protein GtfE had expected glucosylation activity to transfer uridine 5′-diphosphoglucose to the vancomycin aglycone. This study laid the foundation for producing glycosyl diversity of vancomycin.

     

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