1ku2 | pdb_00001ku2

Crystal Structure of Thermus aquaticus RNA Polymerase Sigma Subunit Fragment Containing Regions 1.2 to 3.1

spinqualitylabelsall models 1ku2, resolution 2.90Å Show:Asymmetric Unit Biological Assembly Drag the structure with the mouse to rotate   Export Animated Image   Print3D Structural highlights 1ku2 is a 2 chain structure with sequence from Atcc 25104. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance. Ligands: SO4 Related: 1ku3, 1ku7 Resources: FirstGlance, OCA, PDBe, RCSB, PDBsum, ProSAT Function [Q9EZJ8_THEAQ] Sigma factors are initiation factors that promote the attachment of RNA polymerase to specific initiation sites and are then released (By similarity).[RuleBase:RU000715] 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 sigma subunit is the key regulator of bacterial transcription. Proteolysis of Thermus aquaticus sigma(A), which occurred in situ during crystallization, reveals three domains, sigma(2), sigma(3), and sigma(4), connected by flexible linkers. Crystal structures of each domain were determined, as well as of sigma(4) complexed with -35 element DNA. Exposed surfaces of each domain are important for RNA polymerase binding. Universally conserved residues important for -10 element recognition and melting lie on one face of sigma(2), while residues important for extended -10 recognition lie on sigma(3). Genetic studies correctly predicted that a helix-turn-helix motif in sigma(4) recognizes the -35 element but not the details of the protein-DNA interactions. Positive control mutants in sigma(4) cluster in two regions, positioned to interact with activators bound just upstream or downstream of the -35 element. Structure of the bacterial RNA polymerase promoter specificity sigma subunit.,Campbell EA, Muzzin O, Chlenov M, Sun JL, Olson CA, Weinman O, Trester-Zedlitz ML, Darst SA Mol Cell. 2002 Mar;9(3):527-39. PMID:11931761 From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine. See Also Sigma factor 3D structures

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