›› 2009, Vol. 36 ›› Issue (10): 39-43.

• 生物技术 • 上一篇    下一篇

高致病猪繁殖与呼吸综合征病毒JXA1株Nsp2基因分段克隆表达及其单克隆抗体的制备

胡鸿惠1,2,曹振2,赵铁柱2,王斌3,秦亚嫚2,杨璐2,王传彬2,陈西钊2,田克恭2   

  1. (1.中国农业大学动物医学院, 北京 100193; 2.中国动物疫病预防控制中心, 北京 100125;3.北京市动物卫生监督所, 北京 100044)
  • 收稿日期:1900-01-01 修回日期:1900-01-01 出版日期:2009-10-20 发布日期:2009-10-20
  • 通讯作者: 田克恭

Expression and Development of Monoclonal Antibody against Nsp2 Gene Fragments of Highly Virulent PRRSV JXA1 Strain

HU Hong-hui1,2, CAO Zhen2, ZHAO Tie-zhu2, WANG Bin3, QIN Ya-man2,
YANG Lu2, WANG Chuan-bin2, CHEN Xi-zhao2, TIAN Ke-gong2
  

  1. (1.College of Veterinary Medicine, China Agricultural University, Beijing 100193, China; 2.China Animal Disease Control Center, Beijing 100125, China; 3.Beijing Animal Health Inspection Institute, Beijing 100044, China)
  • Received:1900-01-01 Revised:1900-01-01 Online:2009-10-20 Published:2009-10-20
  • Contact: TIAN Ke-gong

摘要: 分析猪繁殖与呼吸综合征病毒(porcine reproductive and respiratory syndrome virus, PRRSV)非结构蛋白Nsp2,扩增和克隆JXA1株Nsp2基因的4个片段,并将它们分别插入pGEX-6P-1表达载体构建重组表达质粒,经IPTG 诱导表达得到蛋白,纯化后进行活性鉴定。以分段表达的蛋白为抗原,建立间接ELISA方法用于杂交瘤细胞株的筛选。用PRRSV NVDC-JXA1株灭活疫苗对BALB/c小鼠进行常规免疫,最后一次用活毒加强免疫,取其脾细胞与SP2/0细胞在聚乙二醇作用下融合,经过选择性培养、有限稀释筛选到1株针对Nsp2的杂交瘤细胞株6B8。鉴定结果表明,该株杂交瘤细胞仅与4个蛋白片段中的Nsp2F1有反应,细胞经长期体外培养和冻存后复苏能稳定分泌抗体,上清效价达1∶210,腹水效价达1∶106。本研究成功表达了4个PRRSV JXA1株的非结构蛋白Nsp2的片段,以其为抗原建立筛选方法,得到1株针对Nsp2的单克隆抗体,为研究Nsp2功能和建立相关诊断方法奠定物质基础。

关键词: PRRSV JXA1; Nsp2; 单克隆抗体

Abstract: Analyzing PRRSV gene Nsp2 by biological software, four gene fragments of Nsp2 were successfully amplified by RT-PCR and cloned from the PRRSV JXA1 strain. Their expressing plasmids were constructed by inserting the target gene fragments into pGEX-6P-1 vector and were induced with IPTG. Subsequently, the collecting and purifying proteins were identified. Using these proteins, we established an indirect ELISA for bolting McAbs. We immunized the BALB/c mice with PRRSV vaccine. After the final immunization with virus, spleen cells of mice fused with myeloma cells SP2/0 were filtered by culturing selectively, diluting finitely. As a result, an anti-Nsp2 protein McAb was obtained and named as 6B8. It is only with reaction to Nsp2F1. The ELISA titers of 6B8 supernatants and ascites were 210 and 106 respectively. In this study, firstly we successfully cloned and expressed Nsp2 gene fragments of PRRSV JXA1, secondly an anti-Nsp2 protein McAb was obtained. It is a basic research for analyzing the function of Nsp2 and establishing related diagnosis method.

Key words: PRRSV JXA1; Nsp2; McAb

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