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Journal of Virology logoLink to Journal of Virology
. 1979 Dec;32(3):749–761. doi: 10.1128/jvi.32.3.749-761.1979

gag-Related polypeptides encoded by replication-defective avian oncoviruses.

C W Rettenmier, S M Anderson, M W Riemen, H Hanafusa
PMCID: PMC525922  PMID: 229264

Abstract

The content of viral structural (gag) protein sequences in polypeptides encoded by replication-defective avian erythroblastosis virus (AEV) and myelocytomatosis virus MC29 was assessed by immunological and peptide analyses. Direct comparison with gag proteins of the associated helper viruses revealed that MC29 110K polypeptide contained p19, p12, and p27, whereas the AEV 75K polypeptide had sequences related only to p19 and p12. Both of these polypeptides contained some information that was unrelated to gag, pol, or env gene products. In addition, no homology was detected between these unique peptides of MC29 110K and AEV 75K. The AEV 75K polypeptide shared strain-specific tryptic peptides with the p19 encoded by its naturally occurring helper virus; this observation suggests that gag-related sequences in 75K were originally derived from the helper viral gag gene. Digestion of oxidized MC29 110K and AEV 75K proteins with the Staphylococcus aureus V8 protease generated a fragment which comigrated with N-acetylmethionylsulfoneglutamic acid, a blocked dipeptide which is the putative amino-terminal sequence of structural protein p19 and gag precursor Pr76gag. This last finding is evidence that the gag sequences are located at the N-terminal end of the MC29 110K and AEV 75K polypeptides.

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Selected References

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