6ajo

Complex form of Uracil DNA glycosylase X and uracil-DNA.

spinqualitylabelsall models 6ajo, resolution 2.27Å Show:Asymmetric Unit Biological Assembly Drag the structure with the mouse to rotate   Export Animated Image   Print3D Structural highlights 6ajo is a 2 chain structure with sequence from Mycolicibacterium smegmatis and Mycolicibacterium smegmatis MC2 155. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance. Method: X-ray diffraction, Resolution 2.269Å Ligands: ORP, PO4, URA Resources: FirstGlance, OCA, PDBe, RCSB, PDBsum, ProSAT Function A0QP43_MYCS2 Publication Abstract from PubMed Uracil DNA glycosylases (UDGs) are important DNA repair enzymes that excise uracil from DNA, yielding an abasic site. Recently, UdgX, an unconventional UDG with extremely tight binding to DNA containing uracil, was discovered. The structure of UdgX from Mycobacterium smegmatis in complex with DNA shows an overall similarity to that of family 4 UDGs except for a protruding loop at the entrance of the uracil-binding pocket. Surprisingly, H109 in the loop was found to make a covalent bond to the abasic site to form a stable intermediate, while the excised uracil remained in the pocket of the active site. H109 functions as a nucleophile to attack the oxocarbenium ion, substituting for the catalytic water molecule found in other UDGs. To our knowledge, this change from a catalytic water attack to a direct nucleophilic attack by the histidine residue is unprecedented. UdgX utilizes a unique mechanism of protecting cytotoxic abasic sites from exposure to the cellular environment. Covalent binding of uracil DNA glycosylase UdgX to abasic DNA upon uracil excision.,Ahn WC, Aroli S, Kim JH, Moon JH, Lee GS, Lee MH, Sang PB, Oh BH, Varshney U, Woo EJ Nat Chem Biol. 2019 Jun;15(6):607-614. doi: 10.1038/s41589-019-0289-3. Epub 2019 , May 17. PMID:31101917 From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine. See Also DNA glycosylase 3D structures

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