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J Virol. 1994 November; 68(11): 6985-6993

Mutations in the cytoplasmic tail of herpes simplex virus glycoprotein H suppress cell fusion by a syncytial strain.

Medical Research Council Laboratory of Molecular Biology, Cambridge, United Kingdom.

ABSTRACT

We have developed a complementation assay, using transiently transfected COS cells, to facilitate a molecular analysis of the herpes simplex virus type 1 glycoprotein gH. When infected by a gH-null syncytial virus, COS cells expressing wild-type gH generate infectious progeny virions and form a syncytium with neighboring cells. By deletion and point mutagenesis, we have found particular residues in the gH cytoplasmic tail to be essential for generation of a syncytium but apparently dispensable for production of infectious virions. This study emphasizes the different requirements for cell-cell and cell-envelope fusion and demonstrates that changes in the non-syn locus UL22-gH can reverse the syncytial phenotype.

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