Abstract
In order to map linear B epitopes in feline immunodeficiency virus (FIV) envelope glycoproteins (Env), a random library of FIV Env polypeptides fused to beta-galactosidase and expressed in Escherichia coli was screened by using sera from experimentally FIV-infected cats. We mapped five antibody-binding domains in the surface envelope glycoprotein (SU1 to SU5) and four in the transmembrane envelope glycoprotein (TM1 to TM4). Immunological analysis with 48 serum samples from naturally or experimentally infected cats of diverse origins revealed a broad group reactivity for epitopes SU2, TM2, and TM3, whereas SU3 appeared as strictly type specific. To study selection pressures acting on the identified immunogenic domains, we analyzed structural constraints and distribution of synonymous and nonsynonymous mutations (amino acids unchanged or changed). Two linear B epitopes (SU3 and TM4) appeared to be submitted to positive selection for change, a pattern of evolution predicting their possible involvement in antiviral protection. These experiments provide a pertinent choice of oligopeptides for further analysis of the protective response against FIV envelope glycoproteins, as a model to understand the role of antibody escape in lentiviral persistence and to design feline AIDS vaccines.
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