An RNA polymerase II transcription factor has an associated DNA-dependent ATPase (dATPase) activity strongly stimulated by the TATA region of promoters.
A transcription factor required for synthesis of accurately initiated run-off transcripts by RNA polymerase II has been purified and shown to have an associated DNA-dependent ATPase (dATPase) activity that is strongly stimulated by the TATA region of promoters. This transcription factor, designated delta, was purified more than 3000-fold from extracts of crude rat liver nuclei and has a native molecular mass of approximately 230 kDa. DNA-dependent ATPase (dATPase) and transcription activities copurify when delta is analyzed by hydrophobic interaction and ion-exchange HPLC, arguing that transcription factor delta possesses an ATPase (dATPase) activity. ATPase (dATPase) is specific for adenine nucleotides; ATP and dATP, but not CTP, UTP, or GTP, are hydrolyzed. ATPase (dATPase) is stimulated by both double-stranded and single-stranded DNAs, including pUC18, ssM13, and poly(dT); however, DNA fragments containing the TATA region of either the adenovirus 2 major late or mouse interleukin 3 promoters stimulate ATPase as much as 10-fold more effectively than DNA fragments containing nonpromoter sequences. These data suggest the intriguing possibility that delta plays a critical role in the ATP (dATP)-dependent activation of run-off transcription through a direct interaction with the TATA region of promoters.
Conaway
R C
RC
Department of Chemistry, University of Texas, Austin 78712-1096.
Conaway
J W
JW
D000251:Adenosine Triphosphatases / Q000378:metabolism*; D000818:Animals; D001483:Base Sequence; D002467:Cell Nucleus / Q000201:enzymology; D002846:Chromatography, Affinity; D002851:Chromatography, High Pressure Liquid; D004265:DNA Helicases / Q000378:metabolism*; D004268:DNA-Binding Proteins; D050981:Erythroid-Specific DNA-Binding Factors; D007700:Kinetics; D008099:Liver / Q000201:enzymology; D008297:Male; D008969:Molecular Sequence Data; D008970:Molecular Weight; D015345:Oligonucleotide Probes; D011401:Promoter Regions, Genetic; D051381:Rats; D011919:Rats, Inbred Strains; D014157:Transcription Factors / Q000302:isolation & purification / Q000378:metabolism*; D014158:Transcription, Genetic
D004268:DNA-Binding Proteins; D050981:Erythroid-Specific DNA-Binding Factors; D015345:Oligonucleotide Probes; D014157:Transcription Factors; D000251:Adenosine Triphosphatases; D004265:DNA Helicases