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. 1983 Jan;45(1):80–90. doi: 10.1128/jvi.45.1.80-90.1983

Characterization of the soluble glycoprotein released from vesicular stomatitis virus-infected cells.

P A Chatis, T G Morrison
PMCID: PMC256389  PMID: 6296461

Abstract

Vesicular stomatitis virus-infected Chinese hamster ovary cells release into the extracellular medium a soluble form of the vesicular stomatitis virus glycoprotein (G protein) termed Gs (Kang and Prevec, Virology 46:678-680, 1971). The properties of this molecule and the cellular site at which it is generated were characterized. By comparing the sizes and the peptide maps of the unglycosylated forms of G and Gs, we found that between 5,000 and 6,000 daltons of the carboxy-terminal end of the G protein is cleaved to generate the Gs molecule. This truncated molecule contains no fatty acid. Gs released from cells grown at 39 degrees C migrated on polyacrylamide gels slightly slower than Gs released at 30 degrees C. The unglycosylated form of Gs also showed this size difference. Furthermore, unglycosylated Gs was resolved into two species upon isoelectric focusing: the relative amounts of the two species depended upon the temperature at which infected cells were incubated. Full-sized unglycosylated virus-associated G also was resolved into two species, but the more basic form predominated at both 30 and 39 degrees C. The appearance of Gs in the extracellular medium depended upon the presence of stable, full-sized G at the cell surface. The amount of Gs released was quantitated in seven different situations in which the migration of G to the cell surface was inhibited. In all cases, the amount of Gs released was also decreased. In addition, incubation of cells surface labeled with 125I resulted in the release of 125I-labeled Gs protein, as well as full-sized G protein. These results suggest that Gs is generated primarily by proteolytic cleavage of plasma membrane-associated G at a site in the molecule just amino terminal to the membrane-spanning region of the molecule.

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Selected References

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