3igd

Crystal structure of Mtu recA intein, splicing domain

spinqualitylabelsall models 3igd, resolution 2.40Å Show:Asymmetric Unit Biological Assembly Drag the structure with the mouse to rotate   Export Animated Image   Print3D Structural highlights 3igd is a 1 chain structure with sequence from Mycobacterium tuberculosis. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance. Ligands: ZN NonStd Res: SNN Related: 2in0, 3ifj Gene: MT2806, MTV002.02c, recA, Rv2737c (Mycobacterium tuberculosis) Resources: FirstGlance, OCA, RCSB, PDBsum Function [RECA_MYCTU] Can catalyze the hydrolysis of ATP in the presence of single-stranded DNA, the ATP-dependent uptake of single-stranded DNA by duplex DNA, and the ATP-dependent hybridization of homologous single-stranded DNAs. It interacts with LexA causing its activation and leading to its autocatalytic cleavage.[HAMAP-Rule:MF_00268] PI-MtuI is an endonuclease.[HAMAP-Rule:MF_00268] 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 Inteins are phylogenetically diverse self-splicing proteins that are of great functional, evolutionary, biotechnological, and medical interest. To address the relationship between intein structure and function, particularly with respect to regulating the splicing reaction, and to groom inteins for application, we developed a phage display system to extend current in vivo selection for enhanced intein function to selection in vitro. We thereby isolated inteins that can function under excursions in temperature, pH, and denaturing environment. Remarkably, most mutations mapped to the surface of the intein, remote from the active site. We chose two mutants with enhanced splicing activity for crystallography, one of which was also subjected to NMR analysis. These studies define a "ripple effect", whereby mutations in peripheral non-catalytic residues can cause subtle allosteric changes in the active-site environment in a way that facilitates intein activity. Altered salt-bridge formation and chemical shift changes of the mutant inteins provide a molecular rationale for their phenotypes. These fundamental insights will advance the utility of inteins in chemical biology, biotechnology, and medicine. Selection and structure of hyperactive inteins: peripheral changes relayed to the catalytic center.,Hiraga K, Soga I, Dansereau JT, Pereira B, Derbyshire V, Du Z, Wang C, Van Roey P, Belfort G, Belfort M J Mol Biol. 2009 Nov 13;393(5):1106-17. Epub 2009 Sep 8. PMID:19744499 From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine. See Also Endonuclease Recombinase A

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