2oxm

Crystal structure of a UNG2/modified DNA complex that represent a stabilized short-lived extrahelical state in ezymatic DNA base flipping

spinqualitylabelsall models 2oxm, resolution 2.50Å Show:Asymmetric Unit Biological Assembly Drag the structure with the mouse to rotate   Export Animated Image   Print3D Structural highlights 2oxm is a 3 chain structure with sequence from Homo sapiens. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance. NonStd Res: 4MF Gene: UNG, DGU, UNG1, UNG15 (Homo sapiens) Resources: FirstGlance, OCA, RCSB, PDBsum Disease [UNG_HUMAN] Defects in UNG are a cause of immunodeficiency with hyper-IgM type 5 (HIGM5) [MIM:608106]. A rare immunodeficiency syndrome characterized by normal or elevated serum IgM levels with absence of IgG, IgA, and IgE. It results in a profound susceptibility to bacterial infections. Function [UNG_HUMAN] Excises uracil residues from the DNA which can arise as a result of misincorporation of dUMP residues by DNA polymerase or due to deamination of cytosine. 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 enzyme uracil DNA glycosylase (UNG) excises unwanted uracil bases in the genome using an extrahelical base recognition mechanism. Efficient removal of uracil is essential for prevention of C-to-T transition mutations arising from cytosine deamination, cytotoxic U*A pairs arising from incorporation of dUTP in DNA, and for increasing immunoglobulin gene diversity during the acquired immune response. A central event in all of these UNG-mediated processes is the singling out of rare U*A or U*G base pairs in a background of approximately 10(9) T*A or C*G base pairs in the human genome. Here we establish for the human and Escherichia coli enzymes that discrimination of thymine and uracil is initiated by thermally induced opening of T*A and U*A base pairs and not by active participation of the enzyme. Thus, base-pair dynamics has a critical role in the genome-wide search for uracil, and may be involved in initial damage recognition by other DNA repair glycosylases. Enzymatic capture of an extrahelical thymine in the search for uracil in DNA.,Parker JB, Bianchet MA, Krosky DJ, Friedman JI, Amzel LM, Stivers JT Nature. 2007 Sep 27;449(7161):433-7. Epub 2007 Aug 19. PMID:17704764 From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine. See Also DNA glycosylase Uracil-DNA glycosylase

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