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. 1989 Jun;63(6):2497–2503. doi: 10.1128/jvi.63.6.2497-2503.1989

DNA binding by the herpes simplex virus type 1 ICP4 protein is necessary for efficient down regulation of the ICP0 promoter.

J Resnick 1, B A Boyd 1, M L Haffey 1
PMCID: PMC250711  PMID: 2542567

Abstract

The herpes simplex virus type 1 ICP4 and ICP0 polypeptides are immediate-early proteins that positively and negatively regulate expression of other viral genes in trans. ICP4 has recently been shown to bind DNA bearing the consensus sequence 5'-ATCGTCNNNN(T/C)CG(A/G)C-3', present upstream of a number of viral genes. To test the hypothesis that this DNA-binding activity is involved in ICP4-mediated gene regulation, site-specific mutagenesis was employed to mutate the version of this sequence in the promoter of the ICP0 gene. The mutation eliminated detectable binding of ICP4 to the promoter as measured in vitro by a gel electrophoresis band shift assay. The ability of the mutated ICP0 promoter to direct synthesis of a reporter gene was also investigated in a transient transfection assay. Whereas ICP4 was found to transactivate the wild-type ICP0 promoter two- to threefold, the mutated promoter was transactivated seven- to ninefold. In assays containing the ICP0 transactivator gene, ICP4 down regulated the wild-type promoter far more efficiently than the mutated promoter. Finally, both the wild-type and mutated ICP0 promoters exhibited a similar response to ICP4 in transfections that included a vector expressing the viral transactivator protein VP16. These experiments suggest that the sequence-specific DNA-binding activity of ICP4 is an essential element of its role as a negative regulator of gene expression.

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Selected References

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