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. 1981 Mar;37(3):860–870. doi: 10.1128/jvi.37.3.860-870.1981

Comparative analysis: intracellular precursor polyproteins of baboon endogenous retroviruses and human viral isolate HL23V.

S A Whiteley, R B Naso
PMCID: PMC171081  PMID: 7230325

Abstract

Intracellular precursor polyproteins of three baboon endogenous retrovirus (BaEV) isolates, m7, 455K, and BILN, were compared with the intracellular proteins of the type C human isolated HL23V by radioimmunoprecipitation, followed by sodium dodecyl sulfate-polyacrylamide gel electrophoresis and tryptic peptide analysis. Human and canine cells infected with m7-BaEV and canine thymus cells infected with BILN-BaEV were characterized by identical precursor polyproteins Pr85gag, Pr70-71gag, Pr65gag, and gPr85env. Canine cells infected with 455K-BaEV consistently showed a slightly different pattern of precursor polyproteins. These included Pr85gag, Pr70gag, Pr67gag, and gPR85env. By tryptic digest mapping of peptides containing [3H]leucine, m7-BaEV and 455K-BaEV were shown to be highly related. By comparison, mapping studies showed that BILN-BaEV was less highly related to m7-BaEV than ws 455K-BaEV. Differences in these related BaEV isolates presumably reflected virus-specific differential cleavage of core protein precursors or alterations in polyprotein primary structure or both. Chase-incubated cells infected with BaEV also contained a stable, p28-related polyprotein termed P72gag. This polyprotein migrated upon sodium dodecyl sulfate-polyacrylamide gel electrophoresis slightly slower than the major core protein precursor Pr70-71gag and appeared to arise by posttranslational modification of Pr70-71gag. Immunoprecipitation of extracts of HL23V-infected cells with antisera to simian sarcoma-simian-associated virus proteins and BaEV proteins confirmed that these cells contained two unrelated viral components, one that was similar to m7-BaEV or BILN-BaEV and a second that was related to simian sarcoma-simian-associated virus. Tryptic digest mapping of BaEV and HL23V prcursor polyproteins suggested that the BaEV-like component of HL23V weas more closely related to m7-BaEV than to 455K-BaEV or BILN-BaEV.

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Selected References

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