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We have compared the pp12 structural protein of the MO-21 and FL-1 BALB/c myeloma retroviruses with the pp12 of several prototype retroviruses. Chymotryptic peptide maps of 125I-labeled, immune-precipitated pp12 proteins revealed that the MO-21 and FL-1 proteins can be distinguished from one another. The MO-21 pp12 most closely resembled the NIH-xenotrophic virus pp12, and the FL-1 pp12 most closely resembled the pp12 of BV-2 and WN 1802 B. Competition radioimmunoassay studies showed that the MO-21 and FL-1 pp12 proteins are also antigenically distinct from one another and that both contain pp12 antigenic determinants of a xenotropic virus. These data support our proposal that these two BALB/c viruses contain a gag gene that was generated by recombination between endogenous eco- and xenotropic viral sequences.

BALB/c myeloma retroviruses: peptide mapping and immunological analysis of the pp12 structural protein