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. 1980 Oct;36(1):93–102. doi: 10.1128/jvi.36.1.93-102.1980

Localization of Membrane-Associated Proteins in Vesicular Stomatitis Virus by Use of Hydrophobic Membrane Probes and Cross-Linking Reagents

Jack J Zakowski 1, Robert R Wagner 1
PMCID: PMC353618  PMID: 6255216

Abstract

The location of membrane-associated proteins of vesicular stomatitis virus was investigated by using two monofunctional and three bifunctional probes that differ in the degree to which they partition into membranes and in their specific group reactivity. Two hydrophobic aryl azide probes, [125I]5-iodonaphthyl-1-azide and [3H]pyrenesulfonylazide, readily partitioned into virion membrane and, when activated to nitrenes by UV irradiation, formed stable covalent adducts to membrane constituents. Both of these monofunctional probes labeled the glyco-protein G and matrix M proteins, but [125I]5-iodonaphthyl-1-azide also labeled the nucleocapsid N protein and an unidentified low-molecular-weight component. Protein labeling of intact virions was unaffected by the presence of cytochrome c or glutathione, but disruption of membrane by sodium dodecyl sulfate greatly enhanced the labeling of all viral proteins except G. Labeling of G protein was essentially restricted to the membrane-embedded, thermolysin-resistant tail fragment. Three bifunctional reagents, tartryl diazide, dimethylsuberimidate, and 4,4′-dithiobisphenylazide, were tested for their capacity to cross-link proteins to membrane phospholipids of virions grown in the presence of [3H]palmitate. Only G and M proteins of intact virions were labeled with 3H-phospholipid by these cross-linkers; the reactions were not affected by cytochrome c but were abolished by disruption of virus with sodium dodecyl sulfate. Dimethylsuberimidate, which reacts with free amino groups, cross-linked 3H-phospholipid to both G and M protein. In contrast, the hydrophilic tartryl diazide cross-linked phospholipid primarily to the M protein, whereas the hydrophobic 4,4′-dithiobisphenylazide cross-linked phospholipid primarily to the intrinsic G protein. These data support the hypothesis that the G protein traverses the virion membrane and that the M protein is membrane associated but does not penetrate very deeply, if at all.

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Selected References

These references are in PubMed. This may not be the complete list of references from this article.

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