2c2q

The crystal structure of mismatch specific uracil-DNA glycosylase (MUG) from Deinococcus radiodurans. Inactive mutant Asp93Ala.

spinqualitylabelsall models 2c2q, resolution 1.70Å Show:Asymmetric Unit Biological Assembly Drag the structure with the mouse to rotate   Export Animated Image   Print3D Structural highlights 2c2q is a 1 chain structure with sequence from Deira. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance. Ligands: ACT Related: 2c2p Resources: FirstGlance, OCA, PDBe, RCSB, PDBsum, ProSAT 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 Deinococcus radiodurans is extremely resistant to the effects of ionizing radiation. The source of the radiation resistance is not known, but an expansion of specific protein families related to stress response and damage control has been observed. DNA repair enzymes are among the expanded protein families in D. radiodurans, and genes encoding five different uracil-DNA glycosylases are identified in the genome. Here we report the three-dimensional structure of the mismatch-specific uracil-DNA glycosylase (MUG) from D. radiodurans (drMUG) to a resolution of 1.75 angstroms. Structural analyses suggest that drMUG possesses a novel catalytic residue, Asp-93. Activity measurements show that drMUG has a modified and broadened substrate specificity compared with Escherichia coli MUG. The importance of Asp-93 for activity was confirmed by structural analysis and abolished activity for the mutant drMUGD93A. Two other microorganisms, Bradyrhizobium japonicum and Rhodopseudomonas palustris, possess genes that encode MUGs with the highest sequence identity to drMUG among all of the bacterial MUGs examined. A phylogenetic analysis indicates that these three MUGs form a new MUG/thymidine-DNA glycosylase subfamily, here called the MUG2 family. We suggest that the novel catalytic residue (Asp-93) has evolved to provide drMUG with broad substrate specificity to increase the DNA repair repertoire of D. radiodurans. The crystal structure of mismatch-specific uracil-DNA glycosylase (MUG) from Deinococcus radiodurans reveals a novel catalytic residue and broad substrate specificity.,Moe E, Leiros I, Smalas AO, McSweeney S J Biol Chem. 2006 Jan 6;281(1):569-77. Epub 2005 Oct 12. PMID:16223719 From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine. See Also DNA glycosylase 3D structures

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