4ai4 | pdb_00004ai4

crystal structure of E38Q mutant of 3-methyladenine DNA glycosylase I from Staphylococcus aureus

spinqualitylabelsall models 4ai4, resolution 1.73Å Show:Asymmetric Unit Biological Assembly Drag the structure with the mouse to rotate   Export Animated Image   Print3D Structural highlights 4ai4 is a 1 chain structure with sequence from Staphylococcus aureus subsp. aureus mssa476. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance. Ligands: SO4, ZN Related: 2jg6, 4ai5 Activity: DNA-3-methyladenine glycosylase I, with EC number 3.2.2.20 Resources: FirstGlance, OCA, RCSB, PDBsum Publication Abstract from PubMed The removal of chemically damaged DNA bases such as 3-methyladenine (3-MeA) is an essential process in all living organisms and is catalyzed by the enzyme 3-MeA DNA glycosylase I. A key question is how the enzyme selectively recognizes the alkylated 3-MeA over the much more abundant adenine. The crystal structures of native and Y16F-mutant 3-MeA DNA glycosylase I from Staphylococcus aureus in complex with 3-MeA are reported to 1.8 and 2.2 A resolution, respectively. Isothermal titration calorimetry shows that protonation of 3-MeA decreases its binding affinity, confirming previous fluorescence studies that show that charge-charge recognition is not critical for the selection of 3-MeA over adenine. It is hypothesized that the hydrogen-bonding pattern of Glu38 and Tyr16 of 3-MeA DNA glycosylase I with a particular tautomer unique to 3-MeA contributes to recognition and selection. A model for 3-methyladenine recognition by 3-methyladenine DNA glycosylase I (TAG) from Staphylococcus aureus.,Zhu X, Yan X, Carter LG, Liu H, Graham S, Coote PJ, Naismith J Acta Crystallogr Sect F Struct Biol Cryst Commun. 2012 Jun 1;68(Pt 6):610-5. Epub, 2012 May 22. PMID:22684054 From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.

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