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河南华溪蟹金属硫蛋白分泌型表达载体的构建、表达及纯化

刘进平,何永吉,王 兰   

  1. 山西大学生命科学学院,山西 太原 030006
  • 出版日期:2014-09-15 发布日期:2014-09-12

Expression of Secreted Metallothionein of Sinopotamon henanense Using Alkaline Phosphatase Promoter (phoA) and Signal Sequence in Escherichia coli

LIU Jin-ping, HE Yong-ji, WANG Lan   

  1. College of Life Science, Shanxi University, Taiyuan 030006, China
  • Online:2014-09-15 Published:2014-09-12

摘要:

目的:构建河南华溪蟹金属硫蛋白(metallothionein,MT)分泌型表达载体并诱导其可溶表达。方法:采用基因重组技术,将河南华溪蟹MT基因亚克隆至碱性磷酸盐启动子(alkaline phosphatase promoter,phoA)分泌型原核表达载体,转化大肠杆菌BL21(DE3),通过低磷酸盐诱导重组蛋白表达,经Ni2+螯合柱分离纯化后,利用紫外光谱扫描分析、十二烷基硫酸钠-聚丙烯酰胺凝胶电泳(sodium dodecyl sulfate-polyacrylamide gelelectrophoresis,SDS-PAGE)及Western blotting检测鉴定重组MT。结果:phoA-MT分泌型表达载体构建成功,工程菌经低磷酸盐诱导后重组MT以可溶形式获得表达,紫外光谱扫描和Western blotting证实表达产物的正确性,SDS-PAGE分析其纯度较高,主要以单体和二聚体的形式存在,其分子质量分别约为7.5、15 kD。结论:成功实现了河南华溪蟹MT的重组表达。

关键词: 河南华溪蟹, 金属硫蛋白, 表达

Abstract:

In this research we aimed to obtain soluble metallothionein (MT) of Sinopotamon henanense. Therefore, a
recombinant phoA plasmid containing MT open reading frame fused with a 6×His tag was constructed. The plasmid
possessed the promoter and signal sequence of the alkaline phosphatase gene of Escherichia coli. Subsequently, the
recombinant phoA-MT vector was transformed into E. coli BL21 (DE3) strain for MT expression. The fusion protein
induced by a low concentration of phosphate was purified by Ni2+ affinity chromatography and analyzed by UV absorption
spectrometry, SDS-PAGE and Western blotting. The results demonstrated that fusion protein was expressed with high purity
as a monomer and a dimmer, with molecular weight of approximately 7.5 and 15 kD, respectively. 

Key words: Sinopotamon henanense, metallothionein, expression

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