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J. Bacteriol., Mar 1997, 1819-1823, Vol 179, No. 5
Copyright © 1997, American Society for Microbiology

In vivo evidence that acyl coenzyme A regulates DNA binding by the Escherichia coli FadR global transcription factor

JE Cronan Jr
Department of Microbiology, University of Illinois, Urbana 61801, USA. John_Cronan@qms1.life.uiuc.edu

In vitro experiments point to fatty acyl coenzymes A (acyl-CoAs) rather than unesterified fatty acids as the small-molecule ligands regulating DNA binding by the FadR protein of Escherichia coli. To provide an in vivo test of this specificity, unesterified fatty acids were generated within the cellular cytosol. These fatty acids were found to be efficient modulators of FadR action only when the acids could be converted to acyl-CoAs.


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