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Tryptic peptide analysis of gag gene proteins of endogenous mouse type C viruses

Tryptic digests of the internal proteins p30, p15, p12, and p10 of mouse xenotropic, ecotropic, and amphotropic type C viruses were subjected to cation-exchange chromatography. Analysis of these maps revealed that the p30 proteins from representative isolates of all three viral subgroups were distinguishable. The p15 proteins were all unique. The p12 proteins of NZB xenotropic and wild-mouse amphotropic viruses were not identical and yielded peptide maps remarkably different from that of the ecotropic virus. The p10 proteins of xenotropic and ecotropic viruses were identical and were dissimilar to that of the wild-mouse amphotropic virus.