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Because Pr65gag is in part located in the nucleus and contains a putative bipartite nuclear targeting signal, we investigated the cellular location and structure of P55gag, a gag-encoded polyprotein known to lack the nucleocapsid (NC) protein NCp10. P55gag was found to be restricted to the cytoplasm of Moloney murine leukemia virus-infected cells. Of interest, P55gag was produced in cells infected by a viral protease deletion mutant and by a recombinant murine sarcoma virus known to lack the protease gene. Surprisingly, our structural and immunological studies indicated that P55gag also lacks carboxy-terminal residues of CAp30. During the course of studying P55gag, we detected a new viral protein within purified virus particles that contained NCp10 tryptic peptide sequences and a CAp30 tryptic peptide lacking in P55gag. This viral protein, which we have named nucleocapsid-related protein (NCRP), also contained antigenic epitopes present in CAp30 and NCp10. P55gag- and NCRP-like proteins were also observed in AKV murine leukemia virus and feline leukemia virus systems. The precise site of cleavage within Pr65gag that produces P55gag and NCRP is unknown but lies upstream of the CAp30-NCp10 junction within the carboxy-terminal domain of CAp30. The existence of a form of NCp10 containing carboxy-terminal CAp30 sequences raises interesting possibilities about its functional role in genomic RNA packaging and/or viral RNA dimerization.

Identification of a new viral protein containing CAp30 and NCp10 sequences in murine and feline leukemia retroviruses