title: The protective immune response induced by B cell epitope of classical swine fever virus glycoprotein E2.
abstract: Classical swine fever virus (CSFV) envelope glycoprotein E2 is a major protective immunogen responsible for eliciting neutralizing antibodies and conferring protective immunity against the virus. Based on the core sequence (TAVSPTTLR, 829-837 aa) of the B cell linear epitope of the CSFV E2 protein identified by Lin et al., two oligonucleotides MF and MR were synthesized and used to construct by PCR a gene cassette encoding a 15 amino acid polypeptide M (CTAVSPTTLRTEVVK), which spans 828-842 amino acids of E2. The gene cassette was fused in-frame to 3' terminal of glutathione S transferase gene (GST) of the prokaryotic expression vector pGEX-6p-1, resulting in the recombinant plasmid pGEX-M. After transformation into Escherichia coli BL21 a soluble fusion protein GST-M with expected size of 28 kDa was expressed after inducing with isopropyl-beta-d-thiogalactoside (IPTG). Enzyme-linked immunosorbent assay (ELISA) and Western blot analysis showed that the purified GST-M had good reactivity with swine anti-CSFV serum and rabbit anti-CSFV E2 serum. Further vaccination trials showed that the fusion protein GST-M could elicit effectively immune response protecting rabbits and pigs from virulent challenge. This study showed a possibility for developing epitope-based vaccines against CSFV.
authors.affiliation: Harbin Veterinary Research Institute, Chinese Academy of Agricultural Sciences, Harbin 150001, PR China.
authors.forename: Siguo
authors.initials: S
authors.lastname: Liu
authors.forename: Changchun
authors.initials: C
authors.lastname: Tu
authors.forename: Chunlai
authors.initials: C
authors.lastname: Wang
authors.forename: Xinglong
authors.initials: X
authors.lastname: Yu
authors.forename: Jianmin
authors.initials: J
authors.lastname: Wu
authors.forename: Sheping
authors.initials: S
authors.lastname: Guo
authors.forename: Meili
authors.initials: M
authors.lastname: Shao
authors.forename: Qiang
authors.initials: Q
authors.lastname: Gong
authors.forename: Qinghu
authors.initials: Q
authors.lastname: Zhu
authors.forename: Xiangang
authors.initials: X
authors.lastname: Kong
mesh_terms: D000595:Amino Acid Sequence; D000818:Animals; D000914:Antibodies, Viral / Q000097:blood; D015153:Blotting, Western; D006691:Classical Swine Fever / Q000276:immunology / Q000517:prevention & control*; D004797:Enzyme-Linked Immunosorbent Assay; D018985:Epitopes, B-Lymphocyte / Q000096:biosynthesis / Q000276:immunology*; D004926:Escherichia coli / Q000378:metabolism; D005982:Glutathione Transferase / Q000235:genetics; D007115:Immunization Schedule; D008969:Molecular Sequence Data; D010455:Peptides / Q000235:genetics / Q000276:immunology* / Q000378:metabolism; D011817:Rabbits; D013552:Swine; D014611:Vaccination; D014759:Viral Envelope Proteins / Q000276:immunology*
chemical_list: D000914:Antibodies, Viral; D018985:Epitopes, B-Lymphocyte; D010455:Peptides; D014759:Viral Envelope Proteins; C087086:glycoprotein E2, classical swine fever virus; D005982:Glutathione Transferase