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. 1994 Nov;68(11):7397–7405. doi: 10.1128/jvi.68.11.7397-7405.1994

The herpes simplex virus UL20 protein compensates for the differential disruption of exocytosis of virions and viral membrane glycoproteins associated with fragmentation of the Golgi apparatus.

E Avitabile 1, P L Ward 1, C Di Lazzaro 1, M R Torrisi 1, B Roizman 1, G Campadelli-Fiume 1
PMCID: PMC237182  PMID: 7933123

Abstract

The Golgi apparatus is fragmented and dispersed in Vero cells but not in human 143TK- cells infected with wild-type herpes simplex virus 1. Moreover, a recombinant virus lacking the gene encoding the membrane protein UL20 (UL20- virus) accumulates in the space between the inner and outer nuclear membranes of Vero cells but is exported and spreads from cell to cell in 143TK- cell cultures. Here we report that in Vero cells infected with UL20- virus, the virion envelope glycoproteins were of the immature type, whereas the viral glycoproteins associated with cell membranes were fully processed up to the addition of sialic acid, a trans-Golgi function. Moreover, the amounts of viral glycoproteins accumulating in the plasma membranes were considerably smaller than those detected on the surface of Vero cells infected with wild-type virus. In contrast, the amounts of viral glycoproteins present on the plasma membranes of 143TK- cells infected with wild-type or UL20- virus were nearly identical. We conclude that (i) in Vero cells infected with UL20- virus the block in the export of virions is at the entry into the exocytic pathway, and a second block in the exocytosis of viral glycoproteins associated with cytoplasmic membranes is due to an impairment of transport beyond Golgi fragments containing trans-Golgi enzymes and not to a failure of the Golgi oligosaccharide-processing functions; (ii) these defects are manifested in cells in which the Golgi apparatus is fragmented; and (iii) the UL20 protein compensates for these defects by enabling transport to and from the fragmented Golgi apparatus.

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