缬氨酸转氨酶基因原核表达载体构建及表达
Construction and expression of prokaryotic vector of valine-pyruvate transaminase gene
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摘要: 构建了具有缬氨酸转氨酶基因的大肠杆菌工程菌,对该酶表达条件进行了优化.PCR结果表明,扩增出一特异DNA条带且长度与avtA基因长度1254 bp符合.通过纸层析检测,筛选到了阳性克隆,但是酶活偏低.SDS-PAGE凝胶电泳显示目的蛋白表达量较低.酶表达优化结果显示:蛋白胨浓度12 g/L,IPTG浓度0.4 mmol/L,经过8 h诱导,酶活达到最大值.Abstract: The engineered strain of Escherichia coli with valine-pyruvate transaminase gene was constructed and the expression condition for valine-pyruvate transaminase was optimized.The result of PCR showed that a special DNA band was amplified and the length of the band was accord with the length of avtA,1 254 bp.Activity of valine-pyruvate transaminase was found by paper chromatography but the enzyme activity was not high.The expression of valine-pyruvate transaminase was evaluated by SDS-PAGE and a high expression was displayed.The optimal conditions were peptone 12 g/L,IPTG 0.4 mmol/L and induced time 8 h.
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Key words:
- valine-pyruvate transaminase /
- Escherichia coli /
- gene cloning /
- protein expression
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