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. 1985 Sep;55(3):778–787. doi: 10.1128/jvi.55.3.778-787.1985

Purification and N-terminal amino acid sequence comparisons of structural proteins from retrovirus-D/Washington and Mason-Pfizer monkey virus.

L E Henderson, R Sowder, G Smythers, R E Benveniste, S Oroszlan
PMCID: PMC255062  PMID: 3927012

Abstract

A new D-type retrovirus originally designated SAIDS-D/Washington and here referred to as retrovirus-D/Washington (R-D/W) was recently isolated at the University of Washington Primate Center, Seattle, Wash., from a rhesus monkey with an acquired immunodeficiency syndrome and retroperitoneal fibromatosis. To better establish the relationship of this new D-type virus to the prototype D-type virus, Mason-Pfizer monkey virus (MPMV), we have purified and compared six structural proteins from each virus. The proteins purified from each D-type retrovirus include p4, p10, p12, p14, p27, and a phosphoprotein designated pp18 for MPMV and pp20 for R-D/W. Amino acid analysis and N-terminal amino acid sequence analysis show that the p4, p12, p14, and p27 proteins of R-D/W are distinct from the homologous proteins of MPMV but that these proteins from the two different viruses share a high degree of amino acid sequence homology. The p10 proteins from the two viruses have similar amino acid compositions, and both are blocked to N-terminal Edman degradation. The phosphoproteins from the two viruses each contain phosphoserine but are different from each other in amino acid composition, molecular weight, and N-terminal amino acid sequence. The data thus show that each of the R-D/W proteins examined is distinguishable from its MPMV homolog and that a major difference between these two D-type retroviruses is found in the viral phosphoproteins. The N-terminal amino acid sequences of D-type retroviral proteins were used to search for sequence homologies between D-type and other retroviral amino acid sequences. An unexpected amino acid sequence homology was found between R-D/W pp20 (a gag protein) and a 28-residue segment of the env precursor polyprotein of Rous sarcoma virus. The N-terminal amino acid sequences of the D-type major gag protein (p27) and the nucleic acid-binding protein (p14) show only limited amino acid sequence homology to functionally homologous proteins of C-type retroviruses.

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Selected References

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