6q0c

MutY adenine glycosylase bound to DNA containing a transition state analog (1N) paired with undamaged dG

spinqualitylabelsall models 6q0c, resolution 2.00Å Show:Asymmetric Unit Biological Assembly Drag the structure with the mouse to rotate   Export Animated Image   Print3D Structural highlights 6q0c is a 3 chain structure with sequence from Geobacillus stearothermophilus and Synthetic construct. This structure supersedes the now removed PDB entry 3fsp. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance. Method: X-ray diffraction, Resolution 2Å Ligands: CA, EDO, NR1, SF4 Resources: FirstGlance, OCA, PDBe, RCSB, PDBsum, ProSAT Function MUTY_GEOSE Base excision repair (BER) glycosylase that initiates repair of A:oxoG to C:G by removing the inappropriately paired adenine base from the DNA backbone, generating an abasic site product (PubMed:25995449) (PubMed:14961129). 8-oxoguanine (oxoG) is a genotoxic DNA lesion resulting from oxidation of guanine; this residue is misread by replicative DNA polymerases, that insert adenine instead of cytosine opposite the oxidized damaged base. Shows a powerful dicrimination of A versus C, since it does not cleave cytosine in oxoG:C pairs (PubMed:25995449). May also be able to remove adenine from A:G mispairs, although this activity may not be physiologically relevant (PubMed:14961129). Publication Abstract from PubMed The adenine glycosylase MutY selectively initiates repair of OG:A lesions and, by comparison, avoids G:A mispairs. The ability to distinguish these closely related substrates relies on the C-terminal domain of MutY which structurally resembles MutT. To understand the mechanism for substrate specificity, we crystallized MutY in complex with DNA containing G across from the high-affinity azaribose transition state analog. Our structure shows that G is accommodated by the OG site and highlights the role of a serine residue in OG versus G discrimination. The functional significance of Ser308 and its neighboring residues was evaluated by mutational analysis, revealing the critical importance of a beta-loop in the C-terminal domain for mutation suppression in cells, and biochemical performance in vitro. This loop comprising residues Phe307, Ser308, and His309 (Geobacillus stearothermophilus sequence positions) is conserved in MutY but absent in MutT and other DNA repair enzymes, and may therefore serve as a MutY-specific target exploitable by chemical biological probes. Structural basis for finding OG lesions and avoiding undamaged G by the DNA glycosylase MutY.,Russelburg LP, O'Shea Murray VL, Demir M, Knutsen KR, Sehgal SL, Cao S, David SS, Horvath MP ACS Chem Biol. 2019 Dec 12. doi: 10.1021/acschembio.9b00639. PMID:31829624 From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine. See Also DNA glycosylase 3D structures

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