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J Virol. 1986 August; 59(2): 210-215

Further characterization of the vesicular stomatitis virus temperature-sensitive O45 mutant: intracellular conversion of the glycoprotein to a soluble form.

ABSTRACT

Reexamination of the viral products of tsO45, a glycoprotein mutant of vesicular stomatitis virus, showed that at 39 degrees C there was a conversion of the glycoprotein (G) to a truncated, soluble form, Gs, which subsequently appeared in the extracellular medium. The half-life for this intracellular conversion and extracellular appearance was about 2 h at 39 degrees C. Gs was precipitated by a monoclonal antibody to the ektodomain but not by an antipeptide serum made against the first 15 amino acids at the carboxy terminus of G. Gs was also resistant to endoglycosidase H digestion. On the basis of pulse-chase experiments, the generation of Gs most probably occurred in the rough endoplasmic reticulum. This additional phenotype of the tsO45 mutant provides another approach for studying the generation and subsequent transport of a secreted protein in fibroblast cells.

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