3k3r | pdb_00003k3r

Unrefined crystal structure of a LexA-DNA complex

spinqualitylabelsall models 3k3r, resolution 3.20Å Show:Asymmetric Unit Biological Assembly Drag the structure with the mouse to rotate   Export Animated Image   Print3D Structural highlights 3k3r is a 4 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. Related: 3jso, 3jsp Gene: lexA, exrA, spr, tsl, umuA, b4043, JW4003 (Escherichia coli K-12) Activity: Repressor lexA, with EC number 3.4.21.88 Resources: FirstGlance, OCA, RCSB, PDBsum 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 eubacterial SOS system is a paradigm of cellular DNA damage and repair, and its activation can contribute to antibiotic resistance. Under normal conditions, LexA represses the transcription of many DNA repair proteins by binding to SOS 'boxes' in their operators. Under genotoxic stress, accumulating complexes of RecA, ATP and single-stranded DNA (ssDNA) activate LexA for autocleavage. To address how LexA recognizes its binding sites, we determined three crystal structures of Escherichia coli LexA in complex with SOS boxes. Here we report the structure of these LexA-DNA complexes. The DNA-binding domains of the LexA dimer interact with the DNA in the classical fashion of a winged helix-turn-helix motif. However, the wings of these two DNA-binding domains bind to the same minor groove of the DNA. These wing-wing contacts may explain why the spacing between the two half-sites of E. coli SOS boxes is invariant. Structure of the LexA-DNA complex and implications for SOS box measurement.,Zhang AP, Pigli YZ, Rice PA Nature. 2010 Aug 12;466(7308):883-6. PMID:20703307 From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.

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