Epitopes described in "Mutation analysis of the cross-reactive epitopes of Japanese encephalitis virus envelope glycoprotein."

Article Authors:Shyan-Song Chiou; Yi-Chin Fan; Wayne D Crill; Ruey-Yi Chang; Gwong-Jen J Chang
Article Title:Mutation analysis of the cross-reactive epitopes of Japanese encephalitis virus envelope glycoprotein.
Reference Detail
Reference ID:1024202
Abstract:Group and serocomplex cross-reactive epitopes have been identified in the envelope (E) protein of several flaviviruses and have proven critical in vaccine and diagnostic antigen development. Here, we performed site-directed mutagenesis across the E gene of a recombinant expression plasmid that encodes the Japanese encephalitis virus (JEV) premembrane (prM) and E proteins and produces JEV virus-like particles (VLPs). Mutations were introduced at I135 and E138 in domain I; W101, G104, G106 and L107 in domain II; and T305, E306, K312, A315, S329, S331, G332 and D389 in domain III. None of the mutant JEV VLPs demonstrated reduced activity to the five JEV type-specific mAbs tested. Substitutions at W101, especially W101G, reduced reactivity dramatically with all of the flavivirus group cross-reactive mAbs. The group and JEV serocomplex cross-reactive mAbs examined recognized five and six different overlapping epitopes, respectively. Among five group cross-reactive epitopes, amino acids located in domains I, II and III were involved in one, five and three epitopes, respectively. Recognition by six JEV serocomplex cross-reactive mAbs was reduced by amino acid substitutions in domains II and III. These results suggest that amino acid residues located in the fusion loop of E domain II are the most critical for recognition by group cross-reactive mAbs, followed by residues of domains III and I. The amino acid residues of both domains II and III of the E protein were shown to be important in the binding of JEV serocomplex cross-reactive mAbs.
Affiliations:Graduate Institute of Microbiology and Public Health, College of Veterinary Medicine, National Chung Hsing University, Taichung, Taiwan, ROC.
Reference Type:Literature
PubMed ID:22337639
Journal:J Gen Virol
Journal Volume:93
Article Pages:1185-92
Journal ISSN:1465-2099
Article Chemical List:Antibodies, Viral;Epitopes;Membrane Glycoproteins;Viral Envelope Proteins;glycoprotein E, Japanese encephalitis virus
Article MeSH List:Amino Acid Sequence; Antibodies, Viral(immunology); Cross Reactions; DNA Mutational Analysis; Encephalitis Virus, Japanese(chemistry; genetics; immunology); Encephalitis, Japanese(immunology; virology); Epitope Mapping; Epitopes(chemistry; genetics; immunology); Humans; Membrane Glycoproteins(chemistry; genetics; immunology); Molecular Sequence Data; Viral Envelope Proteins(chemistry; genetics; immunology)
Curation Last Updated:2014-10-03 22:42:18