A series of hybridomas have been isolated which produce monoclonal antibodies directed against polyprotein gene products of the Gardner, Snyder-Theilen, and McDonough strains of FeSV. Within these ...are representatives of several immunoglobulin classes including IgG1, IgG2a, IgG2b, and IgM. Antibody produced by one hybridoma recognizes immunologic determinants localized within an FeLV gag gene structural component (p15) common to polyproteins encoded by all three FeSV isolates whereas antibody produced by a second is specific for p30 determinants unique to P170gag-fms. Additional hybridomas secrete antibody directed against v-fes-encoded determinants common to the Gardner and Snyder-Theilen FeSV-encoded polyproteins. GA P110gag-fes and ST P85gag-fes immuno-precipitated by antibody directed against p15 exhibit tyrosine-specific protein kinase activity but lack such activity when precipitated by antibody specific for their acquired sequence (v-fes) components.
