Release of the sigma subunit from Escherichia coli RNA polymerase transcription complexes is dependent on the promoter sequence.

Biochemistry
T M StackhouseC F Meares

Abstract

The sigma subunit of bacterial RNA polymerase is required for the specific initiation of transcription at promoter sites. However, sigma is released from the transcription complex shortly after transcription is initiated, and elongation proceeds in the absence of sigma. In order to study the position of sigma release, we have developed a method to quantify the photoaffinity labeling produced by an aryl azide positioned at the leading (5'-) end of nascent RNA, as a function of the transcript length [Stackhouse, T.M., & Meares, C.F. (1988) Biochemistry 27, 3038-3045]. Here we compare photoaffinity labeling of transcription complexes containing three natural bacteriophage promoters (lambda PR, lambda PL, and T7 A1) and two recombinant constructs, A1/PR (T7 A1 promoter with the lambda PR transcribed region) and PR/A1 (lambda PR promoter with the T7 A1 transcribed region). Significant photoaffinity labeling of the sigma subunit was observed only on the templates containing the lambda PR promoter region, regardless of the sequence of the transcribed region. These results indicate the molecular interactions responsible for the position of sigma release from the transcription complex mainly involve the nucleotide sequence of the promot...Continue Reading

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Citations

Dec 15, 2004·Proceedings of the National Academy of Sciences of the United States of America·Joseph T Wade, Kevin Struhl
Jan 15, 2005·Proceedings of the National Academy of Sciences of the United States of America·Yvonne Berghöfer-HochheimerCarol A Gross
Jul 21, 1999·Proceedings of the National Academy of Sciences of the United States of America·S S Daube, P H von Hippel
May 21, 2014·ELife·David DegenRichard H Ebright
Oct 10, 2014·PLoS Computational Biology·Marco Mauri, Stefan Klumpp
Mar 30, 2017·Proceedings of the National Academy of Sciences of the United States of America·Kate L HendersonM Thomas Record
Jul 23, 2021·Proceedings of the National Academy of Sciences of the United States of America·Dylan M PlaskonM Thomas Record
Apr 6, 2019·Biochemistry·Kate L HendersonM Thomas Record

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