Elsevier

Virology

Volume 155, Issue 2, December 1986, Pages 625-632
Virology

Antigenic determinants of influenza virus hemagglutinin XII. The epitopes of a synthetic peptide representing the C-terminus of HA1

https://doi.org/10.1016/0042-6822(86)90222-9Get rights and content

Abstract

A synthetic peptide comprising the C-terminal 24 amino acids of the heavy chain (HA1) of influenza virus hemagglutinin was constructed and examined for antigenic and immunogenic activity. Monoclonal antibodies as well as polyclonal antisera raised against the synthetic peptide were able to bind to intact virus. This binding was greatly enhanced if the virus was first subjected to pH 5, suggesting that this treatment exposes the C-terminus of HA1. Using synthetic analogs of the native sequence it was shown that the epitope recognized by one of the monoclonal antibodies encompasses one or more of the C-terminal four amino acids of HA1 (residues 325–328), which are conserved within subtypes but differ between subtypes, while the other monoclonal antibody recognizes a different epitope which involves at least one of the five variable residues at positions 311–315.

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