基于重组溶葡球菌酶和ATP生物发光技术特异定量检测金黄色葡萄球菌

Quantitative specific detection of Staphylococcus aureus based on recombinant lysostaphin and ATP bioluminescence

基于重组溶葡球菌酶和ATP生物发光法建立特异定量检测金黄色葡萄球菌的方法。优化设计合成溶葡球菌酶序列,构建重组表达载体pQE30-Lys,转化至大肠杆菌M15并诱导表达,镍柱纯化得到目的蛋白。利用重组溶葡球菌酶和ATP生物发光法特异定量检测金黄色葡萄球菌并与平板计数对比。成功表达了重组溶葡球菌酶,并建立了特异定量检测金黄色葡萄球菌的方法,与平板计数具有显著线性关系。本研究建立的将重组溶葡球菌酶和ATP生物发光法相结合的检测方法操作快捷简单,具有良好的应用前景。

Quantitative specific detection of Staphylococcus aureus is based on recombinant lysostaphin and ATP bioluminescence. To produce recombinant lysostaphin, the lysostaphin gene was chemically synthesized and inserted it into prokaryotic expression vector pQE30, and the resulting expression plasmid pQE30-Lys was transformed into E. coli M15 for expressing lysostaphin with IPTG induction. The recombinant protein was purified by Ni2＋-NTA affinity chromatography. Staphylococcus aureus was detected by the recombinant lysostaphin with ATP bioluminescence, and plate count method. The results of the two methods were compared. The recombinant lysostaphin was successfully expressed, and a method of quantitative specific detection of S. aureus has been established, which showed a significant linear correlation with the colony counting. The detection method developed has good perspective to quantify S. aureus.