China Animal Husbandry and Veterinary Medicine ›› 2021, Vol. 48 ›› Issue (1): 303-311.doi: 10.16431/j.cnki.1671-7236.2021.01.034

• Preventive Veterinary Medicine • Previous Articles     Next Articles

Screening and Reactogenicity Test of Bovine Viral Diarrhea Virus NS3 Protein Nanobody

YANG Yan1, QIAN Tianhao1, ZHANG Yanhong1, ZHANG Zhe1, HAO Xiujing2, LI Yan1, LYU Wenhua1, LIU Zhao1, SHENG Jinliang1   

  1. 1. College of Animal Science and Technology, Shihezi University, Shihezi 832000, China;
    2. College of Life Sciences, Ningxia University, Yinchuan 750021, China
  • Received:2020-06-23 Online:2021-01-20 Published:2021-01-15

Abstract: The aim of this study was to obtain highly efficient and specific nanobodies of Bovine viral diarrhea virus (BVDV) NS3 (P80) non-structural proteins.The BVDV inactivated vaccine was used to immunize alpacas and lymphocytes in whole blood were isolated after antibody titer was measured.Phage display technique was used to construct phage display library of heavy chain antibody variable region of alpaca.The phage binding to BVDV-NS3 protein was selected through three successive adsorption-elution-amplification biological screening.Gene sequencing and homology comparison were performed for the cloning of positive nanobody (VHH) identified by PCR and agargel electrophoresis.ELISA was used to verify the reactogenicity of the selected nanobodies,and the nanobodies with high affinity to BVDV-NS3 protein were found.The results showed that the phage display library with insertion rate of 92.8% and storage capacity of 1.84×1014 CFU/mL was obtained.ELISA results and amino acid sequence analysis showed that a nanometer antibody sequence with good reaction to BVDV-NS3 protein and high homology to VHH was successfully obtained.In this study,Escherichia coli was used to successfully express BVDV-NS3 antigen protein,the phage display library of BVDV nanobody was established,the corresponding nanometer antibodies against the important antigen protein of BVDV were screened and had high homology with VHH.The results provided references for the prevention and control,diagnosis and treatment and the development of nanobody drugs of bovine viral diarrhea-mucosal disease.

Key words: Bovine viral diarrhea virus (BVDV); NS3; nanobody; phage display technology

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