China Animal Husbandry and Veterinary Medicine ›› 2022, Vol. 49 ›› Issue (12): 4524-4534.doi: 10.16431/j.cnki.1671-7236.2022.12.002

• Biotechnology • Previous Articles     Next Articles

Construction and Identification of Recombinant Replication-deficient HAdV-5 Expressing VP2 Protein of Infectious Bursal Disease Virus

XU Ting1, XIONG Ting1,2, LI Linyu2, LIU Yufu2, WEN Lianghai1,3, XIE Wenting1, YANG Zekun1, CHEN Ruiai1,2,3,4   

  1. 1. College of Veterinary Medicine, South China Agricultural University, Guangzhou 510642, China;
    2. Zhaoqing Branch Center of Guangdong Laboratory of Lingnan Modern Agricultural Science and Technology, Zhaoqing 526238, China;
    3. Zhaoqing Institute Biotechnology Co., Ltd., Zhaoqing 526238, China;
    4. Zhaoqing Dahuanong Biological Medicine Co., Ltd., Zhaoqing 526238, China
  • Received:2022-06-08 Online:2022-12-05 Published:2022-12-01

Abstract: 【Objective】 The purpose of this study was to construct recombinant replication-deficient Human adenovirus serotype-5 (HAdV-5), that could express the VP2 protein of Infectious bursal disease virus (IBDV) by using the AdEasy system, in order to provide a new idea for the development of IBDV live vector vaccine.【Method】 By homologous recombination, VP2 gene was cloned into the shuttle plasmid pAdTrack-GOI, and finally the recombinant shuttle plasmid named pAdTrack-VP2 was constructed.After linearization of pAdTrack-VP2 by PmeⅠ enzyme, it was transformed into E.coli BJ5183-AD-1 competent cells by heat shock.The recombinant Adenovirus plasmid named pAd-VP2 was constructed by homologous recombination in bacteria.After that, pAd-VP2 was digested with PacⅠ enzyme, and the purified product was transfected into HEK293A cells to package the recombinant replication-deficient HAdV-5 (rAd5-VP2) expressing VP2 protein.The identified recombinant viruses were infected with non-replicating cells such as Vero cells, CEF cells and DF1 cells, and the expression of the target protein was analyzed.【Result】 rAd5-VP2 was expanded by HEK293A cells and the titer of the 10th generation Adenovirus was 7.9×109 IFU/mL.RT-PCR showed that VP2 gene could translate stably in recombinant Adenovirus.Both Western blotting and indirect immunofluorescence assays detected the expression of VP2 protein with a molecular weight of 41 ku.The expression of VP2 protein was also detected in Vero cells, CEF cells and DF1 cells infected with recombinant Adenovirus, indicating that HAdV-5 has the potential to be developed as a live vector vaccine for IBDV.【Conclusion】 Recombinant replication-deficient HAdV-5 was constructed, which could infect some mammalian cells and poultry cells, and the expression of the target protein could be detected.

Key words: infectious bursal disease; VP2 protein; recombinant replication-deficient Human adenovirus serotype-5

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