›› 2007, Vol. 34 ›› Issue (9): 53-57.

• 生物技术 • 上一篇    下一篇

5类等位基因鸡BF2胞外区基因的克隆、可溶性表达和纯化

李新生1,2,杜向党1,陈红英1,高风山2,李云岗2,夏春2
  

  1. 1.河南农业大学牧医工程学院,郑州 450002; 2.中国农业大学动物医学院,农业部预防兽医学重点实验室,北京 100094
  • 收稿日期:1900-01-01 修回日期:1900-01-01 出版日期:2007-09-20 发布日期:2007-09-20

Cloning, Soluble Expression and Purification of Five New Chicken BF2 Genes Extracellular Domains

Li Xinsheng1,2, DU Xiangdang1, CHEN Hongying1, GAO Fengshan2, Li Yungang2, Xia Chun2
  

  1. 1.College of Husbandry and Veterinary, Henan Agriculture University, Zhengzhou 450002,China; 2.College of Veterinary Medicine, China Agriculture University, Beijing 100094,China
  • Received:1900-01-01 Revised:1900-01-01 Online:2007-09-20 Published:2007-09-20

摘要: 从鸡脾脏中提取总 RNA,以总RNA为模板,5’-ATC TAG AGG TAC CGG ATC C-(T)15-3’为反转录引物,采用TaKaRa AMV反转录酶合成First-strand cDNA (fcDNA)。根据GenBank中登录的鸡的BF2基因胞外区序列,设计了含EcoRⅠ和 HindⅢ 酶切位点的2对引物,分别扩增鸡BF2的胞外区基因。PCR产物经纯化回收后,插入到含LacZ基因的原核克隆载体pGEM-T Easy中,转化至大肠杆菌JM109感受态细胞,经EcoRⅠ和Hind Ⅲ双酶切及PCR鉴定,筛选出阳性克隆。再把所克隆的片段亚克隆到表达载体pMAL-p2X vector,构建重组质粒p2X/BF2(1-5)。将重组表达质粒转化入大肠杆菌TB1感受态细胞,筛选阳性克隆,经IPTG诱导表达后,进行聚丙烯酰胺凝胶电泳(SDS-PAGE)分析。结果表明,本研究克隆了5类鸡BF2的胞外区基因序列,试验结果证明本研究已成功克隆并可溶性表达了5类BF2胞外区蛋白质分子,全长约807~819 bp,编码约269~273个氨基酸。采用淀粉树脂柱亲和层析和DEAE凝胶过滤方法对表达产物进行了纯化,并对纯化的表达产物进行了western blot鉴定。本研究为进一步利用BF2的胞外区在体外构建MHC Ⅰ类分子结合筛选抗原表位肽平台奠定了基础。

关键词: BF2基因; 胞外区; pMAL/p2X系统; 可溶性表达; 纯化; 切割 

Abstract: Total RNA from our laboratory stored spleens of four Sanhuang-chickens, one Wuji-chicken and one Zhenzhu-chicken were extracted respectively using Trizol reagent (Gibco/BRL). First-strand cDNA (fcDNA) were generated from total RNA using primer P15T: (5’-CTG ATC TAG AGG TAC CGG ATC CTT TTT TTT TTT TTT T-3’). According to the sequence of chicken BF2gene in GenBank, Two pairs of primers containing EcoRⅠ and Hind Ⅲ restriction sites was designed to clone BF2 genes extracellular domains.After being purified and recovered, the PCR product was inserted into the pGEM-T Easy vector. The recombinant pGEM-T Easy/BF2(1-5) plamid was digested by double enzymes (EcoRⅠand Hind Ⅲ ). The DNA fragments of interest were subcloned into into pMAL-p2X expressed vector between the EcoR I and Hind Ⅲ restriction sites (named p2X-BF2(1-5), respectively) and transfected into E. coli TB1. The clones were sequenced on both strands by the Shanghai Sangon Biotechnology Company.The recombinant plasmids p2X-BF2(1-5) were identified by EcoRⅠ and Hind Ⅲ. The engineering TB1 strains containing p2X-BF2(1-5) were induced by IPTG and SDS-PAGE analysis was carried out to identify the expressed protein.The result revealed the BF2 gene extracellular domains were composed of 807 bp-819 bp nucleotides encoding 269-273 amino acid residues. The expressed MBP-eBF2 fusion proteins were purified using the amylose affinity resin column and DEAE-Sepharose ion exchange chromatography, and cleaved by the factor Xa protease. The purified fusion proteins were identified by western blot and create a basis for reconstruct their complex identifying the virus-derived antigenic peptides.

Key words: chicken; BF2 gene; extracellular domains; pMAL/p2X system; gene cloning; soluble expression; purify; cut

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