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. 1975 Mar;15(3):654–657. doi: 10.1128/jvi.15.3.654-657.1975

Elution and uncoating of Coxsackievirus B3 by isolated HeLa cell plasma membranes.

T G Roesing, P A Toselli, R L Crowell
PMCID: PMC354501  PMID: 123011

Abstract

Plasma membranes isolated from HeLa cells on discontinuous sucrose gradients were assayed for their capacity to elute and uncoat coxsackievirus B3 at 37 C. Because the viral receptors are limited to the surface of HeLa cells, the addition of radioactively labeled virus to the cells prior to cell homogenization provided a useful marker for locating the plasma membranes during the fractionation procedure. Four bands were formed on the discontinuous sucrose gradients with approximately 70% or more of the membrane-associated viral label being recovered in the most dense bands, designated as bands 3 and 4. Bands 3 and 4 also possessed the plasma membrane marker enzymes, Na+, K+ adenosine triphosphatase and 5'-nucleotidase and revealed typical structures characteristic of plasma membranes as revealed by electron microscopy. Pelleted and washed membranes from band 3 both eluted and uncoated B3 32P-labeled virus, whereas membranes from band 4 eluted virus but failed to uncoat it. The membranes from band 4 were shown to inhibit the viral uncoating activity when mixed with membranes of band 3. Characteristically, unfractionated homogenates of cell membranes eluted but did not uncoat virus. The finding of a naturally occurring inhibitor of virus uncoating provides for the first time a way to distinguish between the membrane activities of virus elution and virus uncoating. The inhibitor remains to be characterized.

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Selected References

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