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. 1978 Jul;27(1):28–37. doi: 10.1128/jvi.27.1.28-37.1978

Polypeptide composition of extracellular enveloped vaccinia virus.

L Payne
PMCID: PMC354137  PMID: 691112

Abstract

Extracellular enveloped vaccinia (EEV) virus grown in SIRC and in HeLa cells was purified by consecutive equilibrium centrifugations in sucrose and cesium chloride gradients. A higher degree of purity was obtained with virus material prepared in SIRC cells. The polypeptides of purified EEV and INV (intracellular naked vaccinia) virus were compared in polyacrylamide slab gel electrophoresis. Three proteins (200,000 molecular weight [200K], 95K, and 13K) detected in HeLa-derived INV were absent in EEV. In addition, two INV proteins (65K and 30K) occurred in reduced concentrations in EEV, white another INV protein (27K) was increased in EEV. INV from SIRC cells showed similar alterations of these proteins (with the exception of the 30K and 13K proteins). Detergent treatment, ether extraction, and Pronase treatment showed that these six proteins are located at the surface of INV and are not cecessary for infectivity. Eight proteins (210K, 110K, 89K, 42K, 37K, 21.5K, 21K, and 20K) were detected in EEV that were absent from inv. Brij-58 treatment was employed to remove the envelope from EEV, resulting in the formation of naked particles and an envelope fraction which were separated on cesium chloride gradients. The envelope fractions contained all eight proteins. Seven of the eight proteins were glycoproteins, with the 37K protein being the only unglycosylated protein. It is concluded that a processing of surface INV particle proteins occurs during evelopment. The resultant EEV particle is comprised of an INV particle with a modified surface composition enclosed in an envelope containing virus-specific proteins unique to EEV.

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Selected References

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