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. 1977 Mar;21(3):1128–1139. doi: 10.1128/jvi.21.3.1128-1139.1977

Separate pathways of maturation of the major structural proteins of vesicular stomatitis virus.

D M Knipe, D Baltimore, H F Lodish
PMCID: PMC515654  PMID: 191640

Abstract

Cell fractionation and protein electrophoresis were used to study the intracellular sites of synthesis and intermediate structures in the assembly of the virion proteins of vesicular stomatitis virus. Each of the three major virion proteins assembled into virions through a separable pathway. The nucleocapsid (N) protein was first a soluble protein and later incorporated into free, cytoplasmic nucleocapsids. A small amount of N protein was bound to membranes at later times, presumably representing either nucleocapsids in the process of budding or completed virions attached to the cell surface. The matrix (M) protein also appeared to be synthesized as a soluble protein, but was then directly incorporated into membranous structures with the same density as whole virus. Very little M protein was ever found in membranes banding at the density of plasma membranes. The M protein entered extracellular virus very quickly, as though it moved directly from a soluble state into budding virus. In contrast, the glycoprotein (G) was always membrane bound; it appeared to be directly inserted into membranes during its synthesis. Glycosylation of the G protein was completed only in smooth membrane fractions, possibly in the Golgi apparatus. After a minimum time of 15 min following its synthesis, G protein was incorporated into the surface plasma membrane, from which it was slowly shed into virions. These multiple processing steps probably account for its delayed appearance in virus. From this work it appears that the three major structural proteins come into the surface budding structure through independent pathways and together they coalesce at the plasma membrane to form the mature virion.

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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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