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. 1997 Nov;71(11):8307–8315. doi: 10.1128/jvi.71.11.8307-8315.1997

The null mutant of the U(L)31 gene of herpes simplex virus 1: construction and phenotype in infected cells.

Y E Chang 1, C Van Sant 1, P W Krug 1, A E Sears 1, B Roizman 1
PMCID: PMC192289  PMID: 9343183

Abstract

Earlier studies have shown that the U(L)31 protein is homogeneously distributed throughout the nucleus and cofractionates with nuclear matrix. We report the construction from an appropriate cosmid library a deletion mutant which replicates in rabbit skin cells carrying the U(L)31 gene under a late (gamma1) viral promoter. The mutant virus exhibits cytopathic effects and yields 0.01 to 0.1% of the yield of wild-type parent virus in noncomplementing cells but amounts of virus 10- to 1,000-fold higher than those recovered from the same cells 3 h after infection. Electron microscopic studies indicate the presence of small numbers of full capsids but a lack of enveloped virions. Viral DNA extracted from the cytoplasm of infected cells exhibits free termini indicating cleavage/packaging of viral DNA from concatemers for packaging into virions, but analyses of viral DNAs by pulsed-field electrophoresis indicate that at 16 h after infection, both the yields of viral DNA and cleavage of viral DNA for packaging are decreased. The repaired virus cannot be differentiated from the wild-type parent. These results suggest the possibility that U(L)31 protein forms a network to enable the anchorage of viral products for the synthesis and/or packaging of viral DNA into virions.

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Selected References

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