4jba

Crystal Structure of the Oxidized Form of MarR from E.coli

spinqualitylabelsall models 4jba, resolution 2.50Å Show:Asymmetric Unit Biological Assembly Drag the structure with the mouse to rotate   Export Animated Image   Print3D Structural highlights 4jba is a 2 chain structure with sequence from Escherichia coli K-12. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance. Resources: FirstGlance, OCA, PDBe, RCSB, PDBsum, ProSAT Function MARR_ECOLI Repressor of the marRAB operon which is involved in the activation of both antibiotic resistance and oxidative stress genes. Binds to the marO operator/promoter site. Publication Abstract from PubMed The widely conserved multiple antibiotic resistance regulator (MarR) family of transcription factors modulates bacterial detoxification in response to diverse antibiotics, toxic chemicals or both. The natural inducer for Escherichia coli MarR, the prototypical transcription repressor within this family, remains unknown. Here we show that copper signaling potentiates MarR derepression in E. coli. Copper(II) oxidizes a cysteine residue (Cys80) on MarR to generate disulfide bonds between two MarR dimers, thereby inducing tetramer formation and the dissociation of MarR from its cognate promoter DNA. We further discovered that salicylate, a putative MarR inducer, and the clinically important bactericidal antibiotics norfloxacin and ampicillin all stimulate intracellular copper elevation, most likely through oxidative impairment of copper-dependent envelope proteins, including NADH dehydrogenase-2. This membrane-associated copper oxidation and liberation process derepresses MarR, causing increased bacterial antibiotic resistance. Our study reveals that this bacterial transcription regulator senses copper(II) as a natural signal to cope with stress caused by antibiotics or the environment. The multiple antibiotic resistance regulator MarR is a copper sensor in Escherichia coli.,Hao Z, Lou H, Zhu R, Zhu J, Zhang D, Zhao BS, Zeng S, Chen X, Chan J, He C, Chen PR Nat Chem Biol. 2014 Jan;10(1):21-8. doi: 10.1038/nchembio.1380. Epub 2013 Nov 3. PMID:24185215 From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine. See Also Transcriptional activator 3D structures

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