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. 1996 Nov;70(11):7859–7866. doi: 10.1128/jvi.70.11.7859-7866.1996

Use of transdominant mutants of the origin-binding protein (UL9) of herpes simplex virus type 1 to define functional domains.

A K Malik 1, S K Weller 1
PMCID: PMC190857  PMID: 8892908

Abstract

UL9, the origin-binding protein of herpes simplex virus type 1, contains six sequence motifs conserved in a large superfamily of RNA and DNA helicases. Single-amino-acid substitution mutations in these motifs inactivate UL9 function in vivo (R. Martinez, L. Shao, and S. K. Weller, J. Virol. 66:6735-6746, 1992). Overexpression of wild-type UL9 is inhibitory to plaque formation in a transfection assay which measures viral plaque formation by infectious herpes simplex virus type 1 DNA. Constructs containing mutations in motif I, II, or VI exhibit even stronger inhibitory effects in the same assay and thus can be considered strong transdominant inhibitors of plaque formation by the wild-type virus. The transdominant phenotype can be relieved by introducing a second mutation in the DNA-binding domain or by deleting the N-terminal 35 amino acids of the protein. The inhibitory effects of wild-type UL9 can also be partially relieved by deletion of amino acids 292 to 404. We propose that the N-terminal 35 amino acids of UL9 and residues 292 to 404 may define new functional domains of the UL9 protein.

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Selected References

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