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. 1981 Feb;1(2):144–152. doi: 10.1128/mcb.1.2.144

55,000-dalton, retrovirus-associated, cell membrane glycoprotein: purification and quantitative measurements of expression in viruses, cells, and tissues.

D A Scheinberg 1, M Strand 1
PMCID: PMC369653  PMID: 6965096

Abstract

We have purified to homogeneity and characterized a 55,000-dalton rat cell membrane glycoprotein, gp55. This protein was originally identified in preparations of a defective pseudotype of the Kirsten sarcoma virus and shown to be present in several rodent retrovirus particles. The gp55 was purified from this defective virus by concanavalin A and heparin affinity chromatography, as well as by preparative sodium dodecyl sulfate-gel electrophoresis. Both preparations displayed similar purity and antigenic characteristics. The 125I-labeled gp55 was precipitated by antisera against rodent retroviruses, but not by monospecific antisera against purified type C virus structural proteins, thus indicating that gp55 was retrovirus associated, but unrelated to known retrovirus structural proteins. Competition radioimmunoassay with an anti-rat virus serum which recognized rodent group-specific antigens on gp55 indicated: the presence of gp55 antigens in 15 rodent cell lines, but not 10 nonrodent cell lines; no effect of viral infection or cell transformation on the amount of gp55 expressed; up to 100-fold increases in the concentration of the gp55 antigens in nine rodent retroviruses, but not in five nonrodent viruses, as compared to cells; the presence of gp55 in rodent sera, especially of the NZB mouse, where anti-gp55 antibody was also detected; a lymphoid and epithelial tissue distribution of gp55 in rats and mice. Additional competition radioimmunoassays with a broad-reacting antivirus serum also detected the presence of gp55 in nonrodent, mink, and human cells and thus distinguished rat type, rodent group, and interspecies antigenic determinants on gp55. In conclusion, gp55 is a cell membrane glycoprotein associated in high concentration with retroviruses.

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Selected References

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