›› 2012, Vol. 39 ›› Issue (2): 20-24.

• 生物技术 • 上一篇    下一篇

中国荷斯坦奶牛髓样分化蛋白-2cDNA的克隆与原核表达

焦寒伟1, 王洪梅2, 刘晓2, 杜丽1, 雷明1, 张冬琳1, 郝永昌1, 成鹰1, 何洪彬2, 王凤阳1   

  1. 1. 海南大学农学院,海南省热带动物繁育与疫病研究重点实验室(筹),海口市动物基因工程重点实验室,海南海口 570228;2. 山东省农业科学院奶牛中心,山东济南 250183
  • 收稿日期:2011-07-01 修回日期:1900-01-01 出版日期:2012-02-20 发布日期:2012-02-20
  • 通讯作者: 王凤阳

Cloning and Prokaryotic Expession of MD-2 from Chinese Holstein Dairy Cow

JIAO Han-wei1, WANG Hong-mei2, LIU Xiao2, DU Li1, LEI Ming1, ZHANG Dong-lin1, HAO Yong-chang1, CHENG Ying1, HE Hong-bin2, WANG Feng-yang1   

  1. 1. Hainan Key Laboratory of Tropical Animal Reproduction & Breeding and Epidemic Disease Research (Construction Period),Animal Genetic Engineering Key Laboratory of Haikou,College of Agriculture,Hainan University,Haikou 570228,China;2. Dairy Cattle Research Centre,Shandong Acdemy of Agriculture Science,Jinan 250183,China
  • Received:2011-07-01 Revised:1900-01-01 Online:2012-02-20 Published:2012-02-20

摘要: 本试验旨在克隆并表达中国荷斯坦奶牛髓样分化蛋白-2(myeloid differentiation protein -2,MD-2)基因,并用Western blotting进行鉴定。采用RT-PCR技术从中国荷斯坦奶牛外周血白细胞中扩增MD-2 cDNA,并将扩增产物与pMD20-T载体连接,重组质粒经测序鉴定后,构建pET28a-MD-2重组质粒,转化大肠杆菌BL21(DE3),经IPTG诱导表达后进行SDS-PAGE和Western blotting分析。结果表明,目的基因含有1个483 bp的开放阅读框,编码161个氨基酸;与黄牛、黑猩猩和小鼠MD-2的cDNA序列同源性分别为99.38%、77.02%、68.12%,氨基酸同源性分别为98.75%、65.00%和58.13%。融合蛋白以包涵体的形式存在,分子质量约为25 ku。说明本研究成功克隆并表达了中国荷斯坦奶牛MD-2 cDNA,为其进一步的功能研究提供了理论依据。

关键词: 中国荷斯坦奶牛; 髓样分化蛋白-2; 克隆; 原核表达

Abstract: In order to clone,express and identify myeloid differentiation-2 of Holstein dairy cow,total RNA was isolated from Chinese Holstein dairy cow,RT-PCR was used to amplify MD-2 cDNA. The PCR products were and cloned into pMD20-T vector and the recombinant plasmid was confirmed by PCR,endonuclease digestion. MD-2 was cloned into pET28a vector to construct the pET28a-MD-2,protein expression was induced by IPTG and analyzed by SDS-PAGE and Western blotting. The results showed that the MD-2 gene contain a 483 bp ORF encoding 161 amino acids; His-MD-2 fusion protein was expressed in E.coli BL21(DE3) with molecular weight of 25 ku after induced by IPTG.

Key words: Chinese Holstein dairy cow; MD-2; cloning; prokaryotic expression

中图分类号: