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© Therese Couderc, Marc Lecuit
Publication : Biochimie

The Escherichia coli metallo-regulator RcnR represses rcnA and rcnR transcription through binding on a shared operator site: Insights into regulatory specificity towards nickel and cobalt

Scientific Fields
Diseases
Organisms
Applications
Technique

Published in Biochimie - 30 Oct 2010

Blaha D, Arous S, Blériot C, Dorel C, Mandrand-Berthelot MA, Rodrigue A

Link to Pubmed [PMID] – 21040754

Biochimie 2011 Mar;93(3):434-9

RcnA is an efflux pump responsible for Ni and Co detoxification in Escherichia coli. The expression of rcnA is induced by Ni and Co via the metallo-regulator RcnR. In the present work, the functioning of the promoter-operator region of rcnR and rcnA was investigated using primer extension and DNAse I footprinting experiments. We show that the promoters of rcnR and rcnA are convergent and that apo-RcnR binds on symmetrically located sequences in this intergenic region. Moreover, RcnR DNA binding is specifically modulated by one Ni or Co equivalent and not by other metals. In addition to rcnA, RcnR controls expression of its own gene in response to Ni and Co, but the two genes are differentially expressed.

http://www.ncbi.nlm.nih.gov/pubmed/21040754