›› 2010, Vol. 37 ›› Issue (5): 65-69.

• 生物技术 • 上一篇    下一篇

抗蓖麻毒素单链抗体基因的构建及其在大肠杆菌中的表达

纪秋野1,2, 梁鸿雁1, 刘文森2, 高宏伟2   

  1. (1.黑龙江八一农垦大学, 大庆 163319; 2.军事医学科学院军事兽医研究所, 长春 130062)
  • 收稿日期:1900-01-01 修回日期:1900-01-01 出版日期:2010-05-20 发布日期:2010-05-20
  • 通讯作者: 高宏伟

Construction of a Single Chain Variable Fragment (ScFv) Antibody against Ricin and Expression in E.coli

JI Qiu-ye1,2, LIANG Hong-yan1, LIU Wen-sen2, GAO Hong-wei2   

  1. (1.Heilongjiang Bayi Agricultural University,Daqing 163319,China; 2.Research Institute of Veterinary,Academy of Military Medical Sciences,Changchun 130062, China)
  • Received:1900-01-01 Revised:1900-01-01 Online:2010-05-20 Published:2010-05-20
  • Contact: GAO Hong-wei

摘要: 为构建和表达抗RT单链抗体(ScFv)蛋白,用RT-PCR方法从能分泌特异性抗RT单克隆抗体(McAb)的杂交瘤细胞中分离纯化抗体VH和VL基因。用重叠延伸PCR方法将VH和VL拼接在一起,构建抗RT-ScFv基因。将ScFv基因连接到pMAL-p2X表达载体,转化TB1表达菌。阳性克隆用IPTG诱导18 h,Western blotting鉴定重组蛋白。结果表明,试验成功扩增出了ScFv基因,长度约为750 bp。通过DNA序列测定和分析,构建出VL-(Gly4Ser)3-VH。其VH全长363 bp,可编码121个氨基酸,VL全长324 bp,可编码108个氨基酸。SDS-PAGE和Western blotting分析结果表明,抗RT-ScFv在TB1表达菌中获得高效表达,pMAL-p2X表达的ScFv加上同时融合表达的MBP标签分子质量约为75 ku。本试验成功构建了pMAL-RT-ScFv表达载体,并获得了高效表达。

关键词: 4D12; 单链抗体; 蛋白表达; 蓖麻毒素

Abstract: To construct and express a single chain variable(ScFv) fragment against ricin, VH and VL genes of anti-murine RT monoclonal antibody were cloned by RT-PCR from hybridoma cell secreting anti-RT McAb. ScFv gene was spliced by sequence overlap extending (SOE) PCR. ScFv gene was cloned into pMAL-p2X expression vector and transformed into TB1 E.coli. After positive clones were induced by IPTG for 18 hours,the identification of recombinant protein was detected by Western blotting. ScFv gene of VL-(Gly4Ser)3-VH was constructed successfully. The VH chain consisted of 363 bp and encoded 121 amino acids. The VL chain consisted of 324 bp and encoded 108 amino acids. SDS-PAGE and Western blotting analysis showed that the RT-ScFv gene was expressed in TB1 E.coli. The ScFv antibody expressed by pMAL-p2X fused with MBP tag protein and the relative molecular mass of fusion protein was about 75 ku. The expression vector of pMAL-RT-ScFv fusion protein was constructed successfully,and procured high performance expression.

Key words: 4D12; ScFv; protein expression; ricin

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