Ansari, A Z Allosteric underwinding of DNA is a critical step in positive control of transcription by Hg-MerR. [electronic resource] - Nature Jan 1992 - 87-9 p. digital Publication Type: Journal Article; Research Support, U.S. Gov't, P.H.S. ISSN: 0028-0836 Standard No.: 10.1038/355087a0 doi Subjects--Topical Terms: Allosteric RegulationBacterial Proteins--metabolismBase SequenceBinding SitesDNA, Bacterial--chemistryDNA-Binding Proteins--metabolismDNA-Directed RNA Polymerases--metabolismEscherichia coli--enzymologyMercury--pharmacologyMolecular Sequence DataPlasmidsPromoter Regions, GeneticRestriction MappingTranscription, Genetic--drug effects