title: A Japanese encephalitis virus peptide present on Johnson grass mosaic virus-like particles induces virus-neutralizing antibodies and protects mice against lethal challenge.
abstract: Protection against Japanese encephalitis virus (JEV) is antibody dependent, and neutralizing antibodies alone are sufficient to impart protection. Thus, we are aiming to develop a peptide-based vaccine against JEV by identifying JEV peptide sequences that could induce virus-neutralizing antibodies. Previously, we have synthesized large amounts of Johnson grass mosaic virus (JGMV) coat protein (CP) in Escherichia coli and have shown that it autoassembled to form virus-like particles (VLPs). The envelope (E) protein of JEV contains the virus-neutralization epitopes. Four peptides from different locations within JEV E protein were chosen, and these were fused to JGMV CP by recombinant DNA methods. The fusion protein autoassembled to form VLPs that could be purified by sucrose gradient centrifugation. Immunization of mice with the recombinant VLPs containing JEV peptide sequences induced anti-peptide and anti-JEV antibodies. A 27-amino-acid peptide containing amino acids 373 to 399 from JEV E protein, present on JGMV VLPs, induced virus-neutralizing antibodies. Importantly, these antibodies were obtained without the use of an adjuvant. The immunized mice showed significant protection against a lethal JEV challenge.
authors.affiliation: National Institute of Immunology, New Delhi 110-067, India.
authors.forename: Manisha
authors.initials: M
authors.lastname: Saini
authors.forename: Sudhanshu
authors.initials: S
authors.lastname: Vrati
mesh_terms: D000595:Amino Acid Sequence; D000818:Animals; D000914:Antibodies, Viral / Q000097:blood* / Q000276:immunology; D036022:Capsid Proteins / Q000235:genetics / Q000378:metabolism; D004664:Encephalitis Virus, Japanese / Q000737:chemistry / Q000276:immunology / Q000472:pathogenicity; D004672:Encephalitis, Japanese / Q000517:prevention & control* / Q000821:virology; D007114:Immunization; D022321:Japanese Encephalitis Vaccines / Q000008:administration & dosage / Q000276:immunology*; D008562:Membrane Glycoproteins / Q000737:chemistry / Q000276:immunology*; D051379:Mice; D008969:Molecular Sequence Data; D009500:Neutralization Tests; D010455:Peptides / Q000276:immunology*; D017800:Potyvirus / Q000235:genetics / Q000378:metabolism; D011993:Recombinant Fusion Proteins / Q000235:genetics / Q000276:immunology / Q000378:metabolism; D014759:Viral Envelope Proteins / Q000737:chemistry / Q000276:immunology*; D014771:Virion / Q000737:chemistry / Q000235:genetics / Q000276:immunology
chemical_list: D000914:Antibodies, Viral; D036022:Capsid Proteins; D022321:Japanese Encephalitis Vaccines; D008562:Membrane Glycoproteins; D010455:Peptides; D011993:Recombinant Fusion Proteins; D014759:Viral Envelope Proteins; C080628:glycoprotein E, Japanese encephalitis virus