4b9m | pdb_00004b9m

Structure of the high fidelity DNA polymerase I with an oxidative formamidopyrimidine-dA DNA lesion -thymine basepair in the post- insertion site.

spinqualitylabelsall models 4b9m, resolution 2.05Å Show:Asymmetric Unit Biological Assembly Drag the structure with the mouse to rotate   Export Animated Image   Print3D Structural highlights 4b9m is a 3 chain structure with sequence from Atcc 12980. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance. Ligands: MG, SO4 NonStd Res: FAX Related: 2xo7, 2xy5, 2xy6, 2xy7, 2y1i, 2y1j, 4b9l, 4b9n, 4b9s, 4b9t, 4b9u, 4b9v Activity: DNA-directed DNA polymerase, with EC number 2.7.7.7 Resources: FirstGlance, OCA, PDBe, RCSB, PDBsum, ProSAT Publication Abstract from PubMed 8-Oxopurines (8-oxodG and 8-oxodA) and formamidopyrimidines (FaPydG and FaPydA) are major oxidative DNA lesions involved in cancer development and aging. Their mutagenicity is believed to result from a conformational shift of the N9-C1' glycosidic bonds from anti to syn, which allows the lesions to form noncanonical Hoogsteen-type base pairs with incoming triphosphates during DNA replication. Here we present biochemical data and what are to our knowledge the first crystal structures of carbocyclic FaPydA and FaPydG containing DNA in complex with a high-fidelity polymerase. Crystallographic snapshots show that the cFaPy lesions keep the anti geometry of the glycosidic bond during error-free and error-prone replication. The observed dG.dC-->dT.dA transversion mutations are the result of base shifting and tautomerization. Unexpected non-Hoogsteen-based mutagenicity mechanism of FaPy-DNA lesions.,Gehrke TH, Lischke U, Gasteiger KL, Schneider S, Arnold S, Muller HC, Stephenson DS, Zipse H, Carell T Nat Chem Biol. 2013 May 19. doi: 10.1038/nchembio.1254. PMID:23685671 From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.

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