Type-specific and cross-reactive antigenicity of capsid proteins VP1 and VP2 of echovirus type 7.
After disruption of echovirus type 7 virions with urea and heat, VP1 and VP2 were separated by isoelectric focusing in urea-containing sucrose gradients. Antisera to these two polypeptides were produced in guinea pigs. In complement fixation, antiserum to VP1 reacted with native and heated virions (N and H antigens, respectively) of homologous virus, and also cross-reacted with heated virions of some other enteroviruses used. Antiserum to VP2 was reactive only with heated virions of homologous and heterologous viruses. Interestingly, the anti-VP2 serum reacted neither with native nor even with heated procapsids (naturally-occurring empty capsids). Antiserum to VP1, but not VP2, showed neutralizing and hemagglutination-inhibiting activities. These results suggest that 1) both VP1 and VP2 possess cross-reactive antigenic determinants which are exposed on the surface of heated virions, and 2) type-specific determinants of VP1 are located on the surface of native virions.
D000956:Antigens, Viral / Q000276:immunology*; D036022:Capsid Proteins; D003429:Cross Reactions; D029822:Enterovirus B, Human / Q000276:immunology*; D000939:Epitopes; D007106:Immune Sera; D007525:Isoelectric Focusing; D014764:Viral Proteins / Q000276:immunology*; D015678:Viral Structural Proteins
D000956:Antigens, Viral; D036022:Capsid Proteins; D000939:Epitopes; D007106:Immune Sera; D014764:Viral Proteins; D015678:Viral Structural Proteins