4wlw

CRYSTAL STRUCTURE OF THE AG(I) (ACTIVATOR) FORM OF E. COLI CUER, A COPPER EFFLUX REGULATOR, BOUND TO COPA PROMOTER DNA

spinqualitylabelsall models 4wlw, resolution 2.80Å Show:Asymmetric Unit Biological Assembly Drag the structure with the mouse to rotate   Export Animated Image   Print3D Structural highlights 4wlw is a 3 chain structure with sequence from Escherichia coli K-12 and Synthetic construct. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance. Method: X-ray diffraction, Resolution 2.8Å Ligands: AG, MSE Resources: FirstGlance, OCA, PDBe, RCSB, PDBsum, ProSAT Function CUER_ECOLI Regulates the transcription of the copA and cueO genes. It detects cytoplasmic copper stress and activates transcription in response to increasing copper concentrations. Publication Abstract from PubMed Many transcriptional activators act at a distance from core promoter elements and work by recruiting RNA polymerase through protein-protein interactions. We show here how the prokaryotic regulatory protein CueR both represses and activates transcription by differentially modulating local DNA structure within the promoter. Structural studies reveal that the repressor state slightly bends the promoter DNA, precluding optimal RNA polymerase-promoter recognition. Upon binding a metal ion in the allosteric site, CueR switches into an activator conformation. It maintains all protein-DNA contacts but introduces torsional stresses that kink and undertwist the promoter, stabilizing an A-form DNA-like conformation. These factors switch on and off transcription by exerting dynamic control of DNA stereochemistry, reshaping the core promoter and making it a better or worse substrate for polymerase. TRANSCRIPTION. Allosteric transcriptional regulation via changes in the overall topology of the core promoter.,Philips SJ, Canalizo-Hernandez M, Yildirim I, Schatz GC, Mondragon A, O'Halloran TV Science. 2015 Aug 21;349(6250):877-81. doi: 10.1126/science.aaa9809. PMID:26293965 From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine. See Also Transcriptional activator 3D structures

Proteopedia Page Contributors and Editors (what is this?)

OCA