2yg8

Structure of an unusual 3-Methyladenine DNA Glycosylase II (Alka) from Deinococcus radiodurans

spinqualitylabelsall models 2yg8, resolution 2.00Å Show:Asymmetric Unit Biological Assembly Drag the structure with the mouse to rotate   Export Animated Image   Print3D Structural highlights 2yg8 is a 2 chain structure with sequence from Deinococcus radiodurans. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance. Method: X-ray diffraction, Resolution 2Å Ligands: CL, GOL, MES, MSE Resources: FirstGlance, OCA, PDBe, RCSB, PDBsum, ProSAT Publication Abstract from PubMed 3-Methyladenine DNA glycosylase II (AlkA) is a DNA-repair enzyme that removes alkylated bases in DNA via the base-excision repair (BER) pathway. The enzyme belongs to the helix-hairpin-helix (HhH) superfamily of DNA glycosylases and possesses broad substrate specificity. In the genome of Deinococcus radiodurans, two genes encoding putative AlkA have been identified (Dr_2074 and Dr_2584). Dr_2074 is a homologue of human AlkA (MPG or AAG) and Dr_2584 is a homologue of bacterial AlkAs. Here, the three-dimensional structure of Dr_2584 (DrAlkA2) is presented and compared with the previously determined structure of Escherichia coli AlkA (EcAlkA). The results show that the enzyme consists of two helical-bundle domains separated by a wide DNA-binding cleft and contains an HhH motif. Overall, the protein fold is similar to the two helical-bundle domains of EcAlkA, while the third N-terminal mixed alpha/beta domain observed in EcAlkA is absent. Substrate-specificity analyses show that DrAlkA2, like EcAlkA, is able to remove both 3-methyladenine (3meA) and 7-methylguanine (7meG) from DNA; however, the enzyme possesses no activity towards 1,N(6)-ethenoadenine (A) and hypoxanthine (Hx). In addition, it shows activity towards the AlkB dioxygenase substrates 3-methylcytosine (3meC) and 1-methyladenine (1meA). Thus, the enzyme seems to preferentially repair methylated bases with weakened N-glycosidic bonds; this is an unusual specificity for a bacterial AlkA protein and is probably dictated by a combination of the wide DNA-binding cleft and a highly accessible specificity pocket. Structure-function studies of an unusual 3-methyladenine DNA glycosylase II (AlkA) from Deinococcus radiodurans.,Moe E, Hall DR, Leiros I, Monsen VT, Timmins J, McSweeney S Acta Crystallogr D Biol Crystallogr. 2012 Jun;68(Pt 6):703-12. Epub 2012 May 17. PMID:22683793 From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine. See Also DNA glycosylase 3D structures

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