Abstract
The herpes simplex virus (HSV) regulatory protein, infected-cell polypeptide 4 (ICP4), represses the transcription of promoters that have binding sites for ICP4 located near the transcription start site. It also been shown that ICP4 binds such promoter DNA cooperatively with the TATA-binding protein (TBP) and TFIIB to form a tripartite protein-DNA complex (C. Smith, P. Bates, R. Rivera-Gonzales, B. Gu, and N. A. DeLuca, J. Virol. 67:4676-4687, 1993). In this study, we analyzed the effects of position and orientation of the ICP4-binding site relative to the TATA box in the ICP4 promoter on transcriptional repression by ICP4 and on the ability of ICP4 to form tripartite complexes with TBP and TFIIB. The results of theis parallel study provide a strong correlation between tripartite complex formation and repression. Both tripartite-complex formation and transcriptional repression were efficient when the ICP4-binding site was downstream of the TATA box, within a short distance and in proper orientation. In addition, both tripartite-complex formation and repression were partially sensitive to the stereoaxial positioning of the ICP4-binding site relative to the TATA box. As a preliminary characterization of the tripartite complex, circular permutation analysis was performed to assess the distortion of the proximal promoter region in the tripartite complex. As previously reported, both TBP and ICP4 independently could bend DNA and the relative magnitude by which each of these proteins bent DNA in the tripartite complex was preserved. The results of this study suggest that the formation of tripartite complexes on a promoter is part of the mechanism of repression and that simple blocking as a sole result of ICP4 binding is not sufficient for full repression.
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