Nucleic Acids Research, 1988, Vol. 16, No. 2 555-570
© 1988
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Association of herpes simplex virus regulatory protein ICP4 with sequences spanning the ICP4 gene transcription initiation site
Department of Microbiology, Medical College of Wisconsin Milwaukee, WI 53226, USA
+Present address: Department of Molecular Physiology & Biophysics, Vanderbilt School of Medicine, Nashville, TN 37232, U.S.A.
*To whom correspondence should be addressed
Received September 4, 1987. Revised November 10, 1987. Accepted November 10, 1987.
The HSV gene encoding ICP4 is negatively regulated and the HSV gene encoding thymidine kinase is positively regulated by ICP4 in vivo. We report that ICPA is a component of a stable complex that contains protein and a sequence of approximately 28 nucleotides that span the ICP4 gene transcription initiation site. The association of ICP4 with DNA sequences between positions 103 and +32 relative to the ICP4 mRNA start site was demonstrated by DNA binding immunoassays. DNase footprinting revealed that nucleotides between positions 8 and +20 are protected by ICP4. In contrast, binding of ICP4 to sequences flanking the mRNA start site in the thymidine kinase gene was not observed. Models for ICP4-mediated positive or negative regulation of HSV gene transcription are discussed.
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