Abstract
The herpes simplex virus 1 (HFEM) mutant tsB7 failed to express any detectable viral polypeptides and did not significantly inhibit host cell protein synthesis in infected cells maintained at the nonpermissive temperature. The mutant could complement the growth of a coinfecting temperature-sensitive mutant virus differing in plaque phenotype and thus appeared capable of penetrating doubly infected cells. The yield of tsB7 was enhanced by the coinfecting virus but not to the extent that the coinfecting virus was enhanced. Coinfection studies suggested that the tsB7 defect was complemented in trans, but poorly, by the wild-type parent and other viruses. Marker rescue of tsB7 by transfection with herpes simplex virus 2 XbaI DNA fragments mapped the mutation between 0.45 and 0.70 map units. Analysis of the DNA structure of the ts+ intertypic recombinants generated by this rescue showed that the herpes simplex virus 2 DNA substitutions all contained the region between 0.46 and 0.52 map units, thus further defining the map position of the mutation. Analyses of the polypeptides expressed by these intertypic recombinants defined the genome location of the genes specifying polypeptides 2, 6, 10, 32, 43, and 44 and indicated that the mutation maps in or near genes coding for virion structural polypeptides. This region of the genome is represented as stable transcripts and cytoplasmic mRNA only after viral DNA replication (P. C. Jones and B. Roizman, J. Virol. 31:299-314, 1979), and thus this gene appears to be a late function. These results are consistent with the ts mutation in tsB7 being in a gene coding for a virion component which functions before expression of the alpha genes early in infection. The most likely explanation is that the mutant is blocked at a stage of uncoating and the defect is complemented, although poorly, by a coinfecting virus gene product.
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