3fdq | pdb_00003fdq

Recognition of AT-rich DNA binding sites by the MogR Repressor

spinqualitylabelsall models 3fdq, resolution 1.75Å Show:Asymmetric Unit Biological Assembly Drag the structure with the mouse to rotate   Export Animated Image   Print3D Structural highlights 3fdq is a 4 chain structure with sequence from "bacterium_monocytogenes_hominis"_nyfeldt_1932 "bacterium monocytogenes hominis" nyfeldt 1932. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance. Gene: lmo0674, mogR ("Bacterium monocytogenes hominis" Nyfeldt 1932) Resources: FirstGlance, OCA, PDBe, RCSB, PDBsum, ProSAT Function [MOGR_LISMO] Transcriptional repressor of flagellar motility genes, such as flaA, during extracellular growth at 37 degrees Celsius and during intracellular infection. Binds directly to the gene promoter region and probably prevents RNA polymerase binding. At low temperatures, MogR repression activity is modulated by the DegU response regulator in an unknown mechanism. Required for full virulence. Evolutionary Conservation Check, as determined by ConSurfDB. You may read the explanation of the method and the full data available from ConSurf. Publication Abstract from PubMed The MogR transcriptional repressor of the intracellular pathogen Listeria monocytogenes recognizes AT-rich binding sites in promoters of flagellar genes to downregulate flagellar gene expression during infection. We describe here the 1.8 A resolution crystal structure of MogR bound to the recognition sequence 5' ATTTTTTAAAAAAAT 3' present within the flaA promoter region. Our structure shows that MogR binds as a dimer. Each half-site is recognized in the major groove by a helix-turn-helix motif and in the minor groove by a loop from the symmetry-related molecule, resulting in a "crossover" binding mode. This oversampling through minor groove interactions is important for specificity. The MogR binding site has structural features of A-tract DNA and is bent by approximately 52 degrees away from the dimer. The structure explains how MogR achieves binding specificity in the AT-rich genome of L. monocytogenes and explains the evolutionary conservation of A-tract sequence elements within promoter regions of MogR-regulated flagellar genes. Recognition of AT-rich DNA binding sites by the MogR repressor.,Shen A, Higgins DE, Panne D Structure. 2009 May 13;17(5):769-77. PMID:19446532 From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.

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