7oue | pdb_00007oue

Crystal structure of a trapped Pab-AGOG/single-standed DNA covalent intermediate

spinqualitylabelsall models 7oue, resolution 2.04Å Show:Asymmetric Unit Biological Assembly Drag the structure with the mouse to rotate   Export Animated Image   Print3D Structural highlights 7oue is a 8 chain structure with sequence from Pyrococcus abyssi GE5 and Synthetic construct. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance. Method: X-ray diffraction, Resolution 2.04Å Ligands: K, PED, PO4 Resources: FirstGlance, OCA, PDBe, RCSB, PDBsum, ProSAT Function AGOG_PYRAB DNA repair enzyme that is part of the base excision repair (BER) pathway; protects from oxidative damage by removing the major product of DNA oxidation, 8-oxoguanine (GO), from single- and double-stranded DNA substrates. Publication Abstract from PubMed 8-Oxoguanine (GO) is a major purine oxidation product in DNA. Because of its highly mutagenic properties, GO absolutely must be eliminated from DNA. To do this, aerobic and anaerobic organisms from the three kingdoms of life have evolved repair mechanisms to prevent its deleterious effect on genetic integrity. The major way to remove GO is the base excision repair pathway, usually initiated by a GO-DNA glycosylase. First identified in bacteria (Fpg) and eukaryotes (OGG1), GO-DNA glycosylases were more recently identified in archaea (OGG2 and AGOG). AGOG is the less documented enzyme and its mode of damage recognition and removing remains to be clarified at the molecular and atomic levels. This study presents a complete structural characterisation of apo AGOGs from Pyrococcus abyssi (Pab) and Thermococcus gammatolerans (Tga) and the first structure of Pab-AGOG bound to lesion-containing single- or double-stranded DNA. By combining X-ray structure analysis, site directed mutagenesis and biochemistry experiments, we identified key amino acid residues of AGOGs responsible for the specific recognition of the lesion and the base opposite the lesion and for catalysis. Moreover, a unique binding mode of GO, involving double base flipping, never observed for any other DNA glycosylases, is revealed. In addition to unravelling the properties of AGOGs, our study, through comparative biochemical and structural analysis, offers new insights into the evolutionary plasticity of DNA glycosylases across all three kingdoms of life. Structural and functional determinants of the archaeal 8-oxoguanine-DNA glycosylase AGOG for DNA damage recognition and processing.,Franck C, Stephane G, Julien C, Virginie G, Martine G, Norbert G, Fabrice C, Didier F, Josef SM, Bertrand C Nucleic Acids Res. 2022 Oct 28;50(19):11072-11092. doi: 10.1093/nar/gkac932. PMID:36300625 From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine. See Also DNA glycosylase 3D structures

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