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N末端缺失萝卜谷胱甘肽磷脂氢过氧化物酶的表达、纯化及结构预测

王丰, 刘进元   

  1. 清华大学 生物科学与技术系, 北京 100084
  • 收稿日期:2007-01-11 修回日期:1900-01-01 出版日期:2008-01-26 发布日期:2008-01-26
  • 通讯作者: 王丰

Expression, Purification of a Recombinant NTerminal 32 Amino Acids Deletion Radish PHGPx

WANG Feng, LIU Jinyuan   

  1. Department of Biological Sciences and Biotechnology, Tsinghua University, Beijing 100084, China
  • Received:2007-01-11 Revised:1900-01-01 Online:2008-01-26 Published:2008-01-26
  • Contact: WANG Feng

摘要: 将N末端定位信号缺失萝卜PHGPx(RsPHGPx)的cDNA 片段克隆到表达载体pGEX-6P-1上, 并转化至大肠杆菌内进行表达. 通过GST亲和层析、离子交换层析和凝胶过滤层析, 制备了用于晶体学研究的RsPHGPx. 其浓度约为10 g/L, 纯度超过95%, 具有PHGPx活性. 三维结构同源建模显示RsPHGPx的结构为典型的硫氧还蛋白折叠形式.

关键词: 萝卜, 谷胱甘肽磷脂氢过氧化物酶, 表达, 纯化

Abstract: An Nterminal 32 amino acids radish PHGPx gene (Δ32RsPHGPx) was cloned into expression vector pGEX-6P-1 and transformed into E.coli strain BL21 (DE3). Δ32RsPHGPx for crystallization was prepared via Glutathione SepharoseTM affinity, cationexchange and gel filtration chromatographies. Theconcentration of it was 10 g/L and the purity was over 95%. Δ32RsPHGPx showed obvious PHGPx activity towardslipid hydroperoxides. In addition, a tertiary structure model of Δ32RsPHGPx displayed the thioredoxin fold.

Key words: radish, phospholipid hydroperoxide glutathione peroxidase, expression, purification

中图分类号: 

  • Q518.2