中国寄生虫学与寄生虫病杂志 ›› 2011, Vol. 29 ›› Issue (1): 7-29-32.

• 论著 • 上一篇    下一篇

微小隐孢子虫病毒衣壳蛋白的原核表达及鉴定

 刁玉梅, 宫鹏涛, 李巍, 苏利波, 黄祥盛, 李建华, 张西臣*   

  1. 吉林大学畜牧兽医学院,长春 130062
  • 出版日期:2011-02-28 发布日期:2012-09-27

Prokaryotic Expression and Identification of S-dsRNA Gene from Cryptosporidium parvum Virus

DIAO  Yu-Mei, GONG  Feng-Chao, LI  Wei, SU  Li-Bei, HUANG  Xiang-Cheng, LI  Jian-Hua, ZHANG  Xi-Chen-*   

  1. College of Animal Science and Veterinary Medicine,Jilin University,Changchun 130062,China
  • Online:2011-02-28 Published:2012-09-27

摘要: 目的  对微小隐孢子虫病毒衣壳蛋白S-dsRNA 基因进行克隆、表达和反应原性分析。 方法  以微小隐孢子虫总RNA逆转录的cDNA为模板,克隆S-dsRNA基因,并转化至原核表达载体pET-28a(+)中,构建重组原核表达载体pET-28a(+)-S, 转入大肠埃希菌BL21(DE3)中,用异丙基-β-D-硫代半乳糖苷(IPTG)诱导表达,十二烷基硫酸钠-聚丙烯酰胺凝胶电泳(SDS-PAGE)观察重组蛋白的表达情况,蛋白质印迹(Western blotting)分析重组蛋白与鼠抗微小隐孢子虫阳性血清的反应原性。 结果  PCR和双酶切鉴定表明,重组质粒pET-28a(+)-S构建成功。SDS-PAGE 结果显示,37 ℃下经1 mmol/L IPTG 诱导4 h,重组蛋白表达量最大。重组蛋白主要以包涵体形式表达,相对分子质量(Mr)约为37 000,与预期大小一致,重组蛋白约占蛋白总量的72.6%。Western blotting分析结果表明,重组蛋白能识别抗微小隐孢子虫阳性鼠血清。 结论  微小隐孢子虫病毒衣壳蛋白S-dsRNA 基因表达成功,重组蛋白具有反应原性。

关键词: 微小隐孢子虫, dsRNA 病毒, S-dsRNA, 原核表达

Abstract: Objective   To clone and express S-dsRNA gene of Cryptosporidium parvum virus, and investigate the reactionogenicity of the recombinant.  Methods   Total RNA was extracted from Cryptosporidium parvum and S-dsRNA gene was amplified by RT-PCR. The PCR product was cloned into pET-28a(+) expression vector. The recombinant plasmid pET-28a(+)-S was transformed into E. coli BL21 (DE3) and induced with IPTG. The expression situation of recombinant protein was analyzed by SDS-PAGE. Its reactionogenicity was examined by Western blotting analysis.   Results   pET-28a(+)-S was identified by PCR and double endonuclease digestion. SDS-PAGE result showed that the recombinant protein (Mr 37 000) was expressed in the form of inclusion body. High level expression of recombinant protein was found at 1 mmol/L IPTG condition after incubation at 37 ℃ for 4 h and reached up to 72.6 % of the total protein. The protein was recognized by the antisera from mice immunized with antigens from Cryptosporidium parvum oocysts.  Conclusion   The S-dsRNA gene of Cryptosporidium parvum virus has been expressed with adequate reactionogenicity.

Key words: Cryptosporidium parvum, dsRNA virus, S-dsRNA, Prokaryotic expression