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Monoclonal antibodies to the transformation-specific glycoprotein encoded by the feline retroviral oncogene v-fms.

ABSTRACT

Monoclonal antibodies prepared to epitopes encoded by the transforming gene (v-fms) of the McDonough strain of feline sarcoma virus were used to study v-fms-coded antigens in feline sarcoma virus-transformed rat and mink cells. These antibodies reacted with three different polypeptides (gP180gag-fms, gp140fms, and gp120fms), all of which were shown to be glycosylated. Protein blotting with [125I]-labeled monoclonal immunoglobulin G's was used to determine the relative steady-state levels of these glycoproteins in transformed cells and showed that gp120 and gp140 were the predominant products. Immunofluorescence assays and subcellular fractionation experiments localized these molecules to the cytoplasm of transformed cells in quantitative association with sedimentable organelles. Thus, v-fms-coded glycoproteins differ both chemically and topologically from the partially characterized products of other known oncogenes and presumably transform cells by a different mechanism.

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