A highly conserved ATPase protein as a mediator between acidic activation domains and the TATA-binding protein.
Biochemical and genetic studies suggest the existence of mediators that work between the activation domains (ADs) of regulatory proteins and the basic transcriptional machinery. We have previously shown genetically that Sug1 interacts with the AD of the yeast activator Ga14. Here we provide evidence that the Sug1 protein of yeast binds directly to the ADs of Ga14 and the viral activator, VP16. Sug1 protein is associated with the TATA-binding protein in vivo and binds to it in vitro, consistent with a mediator function. We also demonstrate that Sug1 is not a component of the 26S proteasome, contrary to previous reports. Sug1 is a member of a large, highly conserved family of ATPases, implying a role for ATP hydrolysis in the activation of transcription.
Swaffield
J C
JC
Department of Medicine, University of Texas Southwestern Medical Center, Dallas 75325-8573.
Melcher
K
K
Johnston
S A
SA
D000251:Adenosine Triphosphatases / Q000378:metabolism*; D000595:Amino Acid Sequence; D001665:Binding Sites; D017124:Conserved Sequence; D003546:Cysteine Endopeptidases / Q000378:metabolism; D004268:DNA-Binding Proteins / Q000378:metabolism*; D004926:Escherichia coli; D005656:Fungal Proteins / Q000378:metabolism*; D017405:Herpes Simplex Virus Protein Vmw65 / Q000378:metabolism; D008969:Molecular Sequence Data; D009097:Multienzyme Complexes / Q000378:metabolism; D046988:Proteasome Endopeptidase Complex; D011485:Protein Binding; D011993:Recombinant Fusion Proteins / Q000378:metabolism; D012097:Repressor Proteins; D012441:Saccharomyces cerevisiae; D029701:Saccharomyces cerevisiae Proteins; D035181:TATA-Box Binding Protein; D014157:Transcription Factors / Q000378:metabolism*; D014158:Transcription, Genetic
D004268:DNA-Binding Proteins; D005656:Fungal Proteins; C052130:GAL4 protein, S cerevisiae; D017405:Herpes Simplex Virus Protein Vmw65; D009097:Multienzyme Complexes; D011993:Recombinant Fusion Proteins; D012097:Repressor Proteins; D029701:Saccharomyces cerevisiae Proteins; D035181:TATA-Box Binding Protein; D014157:Transcription Factors; D003546:Cysteine Endopeptidases; D046988:Proteasome Endopeptidase Complex; D000251:Adenosine Triphosphatases; C069670:RPT6 protein, S cerevisiae