Open AccessDifferent rat-derived transforming retroviruses code for an immunologically related intracellular phosphoprotein.
Author(s) -
Howard A. Young,
Thomas Y. Shih,
Edward M. Scolnick,
Suraiya Rasheed,
Murray B. Gardner
Publication year - 1979
Publication title -
proceedings of the national academy of sciences of the united states of america
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 5.011
H-Index - 771
eISSN - 1091-6490
pISSN - 0027-8424
DOI - 10.1073/pnas.76.7.3523
Subject(s) - biology , phosphoprotein , helper virus , virology , virus , transformation (genetics) , microbiology and biotechnology , cell culture , gene , viral replication , genetics
Kirsten sarcoma virus (Ki-MSV) and Harvey sarcoma virus (Ha-MSV) are mouse-rat recombinant viruses that were originally isolated by experimental inoculation of rats with helper-independent mouse type C viruses. We have recently identified in cells transformed by Ki-MSV or Ha-MSV, a phosphoprotein, p21, coded for by Ki-MSV and Ha-MSV [Shih, T.Y., Weeks, M.O., Young, H.A. & Scolnick, E.M. (1979) Virology 95, in press]. The p21, which is not a virion structural protein, was identified with antisera prepared by transplantation in rats of syngeneic Ha-MSV- or Ki-MSV-transformed nonproducer cells. In this study, we have applied the same methodology to examine a purely rat sarcoma virus (RaSV), which was isolated in cell culture by using helper-independent rat type C viruses [Rasheed, S., Gardner, M.B. & Huebner, R.J. (1978) Proc. Natl. Acad. Sci. USA 75, 2972-2976]. We report here that this new, purely rat sarcoma virus apparently codes for a p29, which shares immunological determinants and common V-8 protease-generated peptides with the p21 of Ha-MSV. The data suggest that the RaSV has acquired genetic information with similar coding capacity to some rat genetic information with similar coding combinant viruses, Ki-MSV and Ha-MSV. Based on data obtained on the p21 of a mutant of Ki-MSV temperature-sensitive for the maintenance of transformation, we suggest that the gene in RaSV that codes for the p29 is also required for the maintenance of RaSV-induced fibroblast transformation.