5h99

Crystal structure of Geobacter metallireducens SMUG1 mutant N58D

spinqualitylabelsall models 5h99, resolution 2.50Å Show:Asymmetric Unit Biological Assembly Drag the structure with the mouse to rotate   Export Animated Image   Print3D Structural highlights 5h99 is a 2 chain structure with sequence from Geobacter metallireducens GS-15. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance. Method: X-ray diffraction, Resolution 2.5Å Resources: FirstGlance, OCA, PDBe, RCSB, PDBsum, ProSAT Function Q39ZI0_GEOMG Publication Abstract from PubMed Base deamination is a common type of DNA damage that occurs in all organisms. DNA repair mechanisms are critical to maintain genome integrity, in which the base excision repair pathway plays an essential role. In the BER pathway, the uracil DNA glycosylase superfamily is responsible for removing the deaminated bases from DNA and generates apurinic/apyrimidinic (AP) sites. Geobacter metallireducens SMUG1 (GmeSMUG1) is an interesting family 3 enzyme in the UDG superfamily, with dual substrate specificities for DNA with uracil or xanthine. In contrast, the mutant G63P of GmeSMUG1 has exclusive activity for uracil, while N58D is inactive for both substrates, as we have reported previously. However, the structural bases for these substrate specificities are not well understood. In this study, we solved a series of crystal structures of WT and mutants of GmeSMUG1 at relatively high resolutions. These structures provide insight on the molecular mechanism of xanthine recognition for GmeSMUG1 and indicate that H210 plays a key role in xanthine recognition, which is in good agreement with the results of our EMSA and activity assays. More importantly, our mutant structures allow us to build models to rationalize our previous experimental observations of altered substrate activities of these mutants. Structural Basis of Substrate Specificity in Geobacter metallireducens SMUG1.,Zhang Z, Shen J, Yang Y, Li J, Cao W, Xie W ACS Chem Biol. 2016 Apr 22. PMID:27071000 From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.

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