Roles for BTAF1 and Mot1p in dynamics of TATA-binding protein and regulation of RNA polymerase II transcription.
Regulation of RNA polymerase II (pol II) transcription is a highly dynamic process requiring the coordinated interaction of an array of regulatory proteins. Central to this process is the TATA-binding protein (TBP), the key component of the multiprotein complex TFIID. Interaction of TBP with core promoters nucleates the assembly of the preinitiation complex and subsequent recruitment of pol II. Despite recent advances in our understanding of the dynamic nature of the pol II transcription apparatus, the dynamics of TBP function on pol II promoters has remained largely unexplored. Human BTAF1 (TAF(II)170/TAF-172) and its yeast ortholog, Mot1p, are evolutionarily conserved members of the SNF2-like family of ATPase proteins. Genetic identification of Mot1p as a repressor of pol II transcription was supported by findings that Mot1p and BTAF1 could dissociate TBP from TATA DNA complexes using the energy of ATP hydrolysis. Recent data have revealed new aspects of BTAF1 and Mot1p as positive regulators of TBP function in the pol II system and have described new observations relating to their molecular mechanism of action. We review these data in the context of previous findings with particular attention paid to how human BTAF1 and Mot1p may dynamically regulate TBP function on pol II promoters in cells.
Pereira
Lloyd A
LA
Laboratory for Physiological Chemistry, Division of Biomedical Genetics, UMC-U, Universiteitsweg 100, 3584 Utrecht CG, The Netherlands.
Klejman
Marcin P
MP
Timmers
H Th Marc
HT
D000251:Adenosine Triphosphatases; D000818:Animals; D004265:DNA Helicases / Q000235:genetics / Q000378:metabolism; D006801:Humans; D008954:Models, Biological; D011485:Protein Binding; D012319:RNA Polymerase II / Q000378:metabolism*; D029701:Saccharomyces cerevisiae Proteins / Q000235:genetics / Q000378:metabolism; D035381:TATA-Binding Protein Associated Factors / Q000235:genetics / Q000378:metabolism*; D035181:TATA-Box Binding Protein / Q000235:genetics / Q000378:metabolism*; D035362:Transcription Factor TFIID / Q000235:genetics / Q000378:metabolism*; D014158:Transcription, Genetic
C109035:BTAF1 protein, human; D029701:Saccharomyces cerevisiae Proteins; D035381:TATA-Binding Protein Associated Factors; D035181:TATA-Box Binding Protein; D035362:Transcription Factor TFIID; D012319:RNA Polymerase II; D000251:Adenosine Triphosphatases; C073676:MOT1 protein, S cerevisiae; D004265:DNA Helicases