China Animal Husbandry and Veterinary Medicine ›› 2019, Vol. 46 ›› Issue (11): 3350-3357.doi: 10.16431/j.cnki.1671-7236.2019.11.025

• Preventive Veterinary Medicine • Previous Articles     Next Articles

Construction and Identification of Swine O-type Foot-and-mouth Disease Virus-like Particles

LIU Hanping   

  1. Shanghai Research Center of Veterinary Biological Engineering and Technology, Shanghai HILE Bio-Technique Co., Ltd., Shanghai 201403, China
  • Received:2019-03-21 Online:2019-11-20 Published:2019-11-25

Abstract: To develop the virus-like particles (VLPs) genetic engineering subunit vaccine for swine O-type foot-and-mouth disease virus (FMDV),according to the FMDV complete gene sequence available in GenBank (accession No.:JN998085),four pairs of specific primers were designed to amplify VP1,VP2,VP3 and VP4 genes of FMDV O/MYA98/XJ/2010 strain by PCR. VP3, VP1 and VP4,VP2 gene were cloned into p10 and pH promoters of pFastBac Dual vector,respectively.The recombinant plasmid pFBD-VP3-VP1 and pFBD-VP4-VP2 were obtained and identified.Two recombinant bacmid of rBacmid-VP3-VP1 and rBacmid-VP4-VP2 were generated after the E.coli DH10Bac competent cell was transformed by the two recombinant plasmid,respectively.Two recombinant baculovirus of rvAc-VP3-VP1 and rvAc-VP4-VP2 were successfully rescued by transfected two recombinant bacmids into Sf9 insect cells.Two recombinant baculoviruses were coinfected with suspension cultured Sf9 insect cells,and VP1, VP2, VP3 and VP4 genes were expressed via Bac-to-Bac expression system in Sf9 insect cells.The target proteins were identified and analyzed with specific positive antibody through IFA,SDS-PAGE and Western blotting,and the target proteins were checked as VLPs via by electron microscopy (EM).The results showed that two recombinant baculoviruses expressing four structural proteins of FMDV VP1,VP2,VP3 and VP4 were successfully constructed.The specific antibodies detection results showed that four proteins VP1,VP2,VP3 and VP4 were successfully expressed with good specificity.Four proteins could self-assemble in Sf9 insect cells and form VLPs with a diameter of 25-30 nm similar to that of natural viruses.In this study,FMDV VLPs were successfully prepared in Sf9 insect cells by coinfection expression,which laid a foundation for further developing efficient and safe FMDV gene engineering subunit vaccine.

Key words: foot-and-mouth disease virus (FMDV); structural protein; recombinant baculovirus; virus-like particles (VLPs)

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