5t2w

Structure of thymine DNA glycosylase bound to substrate analog 2'-F-5-formyl-dC

spinqualitylabelsall models 5t2w, resolution 2.20Å Show:Asymmetric Unit Biological Assembly Drag the structure with the mouse to rotate   Export Animated Image   Print3D Structural highlights 5t2w is a 3 chain structure with sequence from Homo sapiens 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 2.2Å Ligands: XFC Resources: FirstGlance, OCA, PDBe, RCSB, PDBsum, ProSAT Function TDG_HUMAN In the DNA of higher eukaryotes, hydrolytic deamination of 5-methylcytosine to thymine leads to the formation of G/T mismatches. This enzyme corrects G/T mispairs to G/C pairs. It is capable of hydrolyzing the carbon-nitrogen bond between the sugar-phosphate backbone of the DNA and a mispaired thymine. In addition to the G/T, it can remove thymine also from C/T and T/T mispairs in the order G/T >> C/T > T/T. It has no detectable activity on apyrimidinic sites and does not catalyze the removal of thymine from A/T pairs or from single-stranded DNA. It can also remove uracil and 5-bromouracil from mispairs with guanine. Publication Abstract from PubMed Thymine DNA glycosylase (TDG) is a base excision repair enzyme with key functions in epigenetic regulation. Performing a critical step in a pathway for active DNA demethylation, TDG removes 5-formylcytosine and 5-carboxylcytosine, oxidized derivatives of 5-methylcytosine that are generated by TET (ten-eleven translocation) enzymes. We determined a crystal structure of TDG bound to DNA with a noncleavable (2'-fluoroarabino) analogue of 5-formyldeoxycytidine flipped into its active site, revealing how it recognizes and hydrolytically excises fC. Together with previous structural and biochemical findings, the results illustrate how TDG employs an adaptable active site to excise a broad variety of nucleobases from DNA. Structural Basis for Excision of 5-Formylcytosine by Thymine DNA Glycosylase.,Pidugu LS, Flowers JW, Coey CT, Pozharski E, Greenberg MM, Drohat AC Biochemistry. 2016 Nov 2. PMID:27805810 From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine. See Also DNA glycosylase 3D structures

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