title: Four T7 RNA polymerase promoters contain an identical 23 bp sequence.
abstract: The DNA sequences of four promoters for the bacteriophage-specified T7 RNA polymerase have been determined. All four regions contain an identical 23 bp sequence 5' pTAATACGACTCACTATAGGGAG-A(oh) which includes the 17 bp prior to and the first 6 bp of the transcribed region. They are located at 46.5, 55, 57 and 87% on the standard T7 map, thereby corresponding to the in vitro T7 class III RNA species IIIa, IV, V and IIIb, respectively. The precise RNA initiation sites were determined by 5' terminal RNA sequence analysis of the transcripts synthesized from promoter-containing DNA fragments. The comparative properties of these promoters for the monomeric T7 RNA polymerase and those for the multimeric E. coli RNA polymerase are discussed.
mesh_terms: D001483:Base Sequence; D001665:Binding Sites; D003090:Coliphages / Q000235:genetics*; D004279:DNA, Viral / Q000235:genetics; D012321:DNA-Directed RNA Polymerases / Q000235:genetics / Q000378:metabolism*; D005809:Genes, Regulator; D014158:Transcription, Genetic
chemical_list: D004279:DNA, Viral; D012321:DNA-Directed RNA Polymerases