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Nucleic Acids Research, 1991, Vol. 19, No. 18 4901-4908
© 1991

MOLECULAR BIOLOGY

Purification of the DNA binding domain of herpes simplex virus type 1 immediate-early protein Vmw175 as a homodimer and extensive mutagenesis of its DNA recognition site

Roger D. Everett, Margaret Elliott, Garham Hope and Anne Orr

Medical Research Council Virology Unit Church Street, Glasgow G11 5JR, UK

Received June 21, 1991. Accepted August 14, 1991.

The herpes simplex virus type 1 (HSV-1) Immediate- Early (IE) polypeptide Vmw175 Is essential for the activation of transcription from viral early and late promoters. Vmw175 also reduces the activity of its own (IE-3) promoter In transfectlon assays. Both transactivatlon and repression mediated by Vmw175 require the integrity of a conserved domain of the polypeptide which has been shown to bind to specific DNA sequences. We have investigated the DNA sequence requirements for Vmw175 binding using a randomly mutated target. The results indicate that the binding site covers a region of 13 nucleotldes divided into proximal and distal parts which are consistent with the consensus ATCGTNNNNNYSG. We have also expressed several different constructs encompassing the DNA binding domain of Vmw175 in bacteria, and obtained preparations of greater than 90% purity. The DNA binding domain is a dimer in solution, and binds DNA with a specificity similar to that of the Intact protein, although the smallest DNA binding competent protein has a slightly reduced specificity.


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