title: MOT1-catalyzed TBP-DNA disruption: uncoupling DNA conformational change and role of upstream DNA.
abstract: SNF2/SWI2-related ATPases employ ATP hydrolysis to disrupt protein-DNA interactions, but how ATP hydrolysis is coupled to disruption is not understood. Here we examine the mechanism of action of MOT1, a yeast SNF2/SWI2-related ATPase that uses ATP hydrolysis to remove TATA binding protein (TBP) from DNA. MOT1 function requires a 17 bp DNA 'handle' upstream of the TATA box, which must be double stranded. Remarkably, MOT1-catalyzed disruption of TBP-DNA does not appear to require DNA strand separation, DNA bending or twisting of the DNA helix. Thus, TBP-DNA disruption is accomplished in a reaction apparently not driven by a change in DNA structure. MOT1 action is supported by DNA templates in which the handle is connected to the TATA box via single-stranded DNA, indicating that the upstream duplex DNA can be conformationally uncoupled from the TATA box. Combining these results with proposed similarities between SNF2/SWI2 ATPases and helicases, we suggest that MOT1 uses ATP hydrolysis to translocate along the handle and thereby disrupt interactions between TBP and DNA.
authors: Department of Biochemistry and Molecular Genetics, University of Virginia Health Science Center, Charlottesville, VA 22908-0733, USA.
authors: R P
authors: RP
authors: Darst
authors: D
authors: D
authors: Wang
authors: D T
authors: DT
authors: Auble
mesh_terms: D000251:Adenosine Triphosphatases / Q000378:metabolism*; D004247:DNA / Q000378:metabolism*; D004265:DNA Helicases / Q000378:metabolism*; D004268:DNA-Binding Proteins / Q000378:metabolism*; D005656:Fungal Proteins / Q000378:metabolism; D005786:Gene Expression Regulation; D008957:Models, Genetic; D009690:Nucleic Acid Conformation; D009698:Nucleoproteins / Q000378:metabolism; D011485:Protein Binding; D029701:Saccharomyces cerevisiae Proteins; D016385:TATA Box; D035381:TATA-Binding Protein Associated Factors; D035181:TATA-Box Binding Protein; D014157:Transcription Factors / Q000378:metabolism*
chemical_list: D004268:DNA-Binding Proteins; D005656:Fungal Proteins; D009698:Nucleoproteins; D029701:Saccharomyces cerevisiae Proteins; D035381:TATA-Binding Protein Associated Factors; D035181:TATA-Box Binding Protein; D014157:Transcription Factors; D004247:DNA; D000251:Adenosine Triphosphatases; C073676:MOT1 protein, S cerevisiae; D004265:DNA Helicases