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Prokaryotic Expression and Identification of the S1 Gene Main Antigen Domain of Avian Infectious Bronchitis Virus

ZHU Yan-ping1,2, GUO Dong-guang1, YUE Feng1,2, YANG Yuan3, LI Chong3, WANG Ai-guo3, LI Bo-wen3, RUAN Tao3, KONG Ling-yun3, WANG Xuan-nian1   

  1.  (1. Bio-technology Centre, Xinxiang University, Xinxiang 453003, China2. Life Science and Technology Department, Xinxiang University, Xinxiang 453003, China3. College of Animal Science, Henan Institute of Science and Technology, Xinxiang 453003, China)

  • Received:2014-01-13 Online:2014-06-20 Published:2014-07-24

Abstract: Avian infectious bronchitis virus (IBV) S1 gene was the object in this study and a pair of primers was designed for amplifying the S1 main antigen fragment of IBV, which was composed of 198 bp. And then it was sub-cloned into prokaryotic expression plasmid pGEX-6P-1. The recombinant plasmid pGEX-6P-1-S1 was transformed into E.coli Rosetta (DE3) and induced by IPTG. SDS-PAGE analysis showed a specific protein band with a molecular weight 33.0 ku, according to our study anticipation. The express production was inclusion body when it was identified. Western blotting indicated that the expressed protein could react with the chicken positive serum and be recognized by the specific monoclonal antibody of GST. The result suggested that the recombinant protein was correctly expressed and had a good antigenicity, which provided substantial antigen base for preparation of IBV monoclonal antibody.

Key words: avian infectious bronchitis virus; S1 protein; prokaryotic expression; identification