Polypeptides of Mason-Pfizer monkey virus. III. Translational order of proteins on the gag and env gene specified precursor polypeptides.
Mason-Pfizer monkey virus (M-PMV), the prototype D-type retrovirus, unlike most retroviruses, preassembles core structures in the cytoplasm of infected cells during morphogenesis. We have shown previously (J. Bradac and E. Hunter, 1984, Virology 138, 260-275) that M-PMV virions contain 5 gag-encoded polypeptides. In this report, the translational order of the proteins encoded on the gag and env genes of M-PMV has been determined by pactamycin mapping. The proposed order of the viral proteins on their respective precursors is env: NH2-gp85-gp20-COOH; gag: NH2-p10-pp24/pp16-p12-p27-p14-COOH. Myristic acid-labeled virions contained a single radioactive protein, p10, supporting the mapping of this molecule to the amino terminus. From these studies it is clear that M-PMV contains an unusual additional gag polypeptide, p12, for which no function has been assigned to date. A remarkable similarity exists in the size and organization of M-PMV and mouse mammary tumor virus (MMTV) gag polypeptides; suggesting a common ancestor to these two viruses.
D000818:Animals; D005814:Genes, Viral; D008253:Macaca mulatta; D010142:Pactamycin / Q000494:pharmacology; D010452:Peptide Biosynthesis; D014176:Protein Biosynthesis; D011498:Protein Precursors / Q000096:biosynthesis / Q000235:genetics*; D012190:Retroviridae / Q000235:genetics* / Q000378:metabolism; D014764:Viral Proteins / Q000096:biosynthesis* / Q000235:genetics
D011498:Protein Precursors; D014764:Viral Proteins; D010142:Pactamycin