Location of the Escherichia coli RNA polymerase α subunit C‐terminal domain at an FNR‐dependent promoter: analysis using an artificial nuclease

FEBS Letters

Green, Jeffrey²  Lloyd, Georgina S¹  Lee, David J¹  Barnard, Anne M.L¹  Busby, Stephen J.W¹ 

[1] School of Biosciences, The University of Birmingham, Birmingham B15 2TT, UK;Department of Molecular Biology and Biotechnology, University of Sheffield, Sheffield S10 2TN, UK

关键词: FNR;    RNA polymerase;    Alpha subunit C-terminal domain;    FeBABE reagent;    Escherichia coli;    αCTD;    RNA polymerase α subunit C-terminal domain;    FNR;    regulator of fumarate and nitrate reduction;    CRP;    cyclic AMP receptor protein;    FeBABE;    iron [S]-1-[p-bromoacetamidobenzyl] ethylenediaminetetraacetate;   

DOI  :  10.1016/S0014-5793(03)01518-7

学科分类：生物化学/生物物理

来源: John Wiley & Sons Ltd.

【 摘 要 】

The Escherichia coli FNR protein is a global transcription regulator that activates gene expression via interactions with the RNA polymerase α subunit C-terminal domain. Using preparations of E. coli RNA polymerase holoenzyme, specifically labelled with a DNA cleavage reagent, we have determined the location and orientation of the C-terminal domain of the RNA polymerase α subunit in transcriptionally competent complexes at a class II FNR-dependent promoter. We conclude that one α subunit C-terminal domain binds immediately upstream of FNR, and that its position and orientation is the same as at similar promoters dependent on CRP, another E. coli transcription activator that is related to FNR. In complementary experiments, we show that the second α subunit C-terminal domain of RNA polymerase can be repositioned by upstream-bound CRP, but not by upstream-bound FNR.

【 授权许可】

Unknown