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Virions of Rous-associated virus type 61 contain a previously unrecognized p19-related protein, called p19f, which comigrates with gag protein p12 during electrophoresis in sodium dodecyl sulfate-polyacrylamide gels but can be separated by gel filtration chromatography in 6 M guanidine hydrochloride. It is shown that the existence of p19f accounts for the earlier inability to order p27 and p12 by the pactamycin mapping procedure. Remapping with pactamycin by using methods which take this new protein into account yielded a gag gene order of NH2-p219-p27-p12-p15-COOH. It also confirmed earlier positions for the env and pol genes and placed unclassified protein p10 near a translational initiation site. The pactamycin-derived mapping position of p12 differs from reports based on tryptic analysis. An analysis of procedural shortcomings emphasizes the need for more definitive determinations of the avian gag gene order.

Novel p19-related protein in Rous-associated virus type 61: implications for avian gag gene order