1a9h | pdb_00001a9h

APURINIC DNA WITH BOUND WATER AT THE DAMAGED SITE AND O2 OF CYTOSINE, BETA FORM, NMR, 1 STRUCTURE

spinqualitylabelsall models 1a9h Show:Asymmetric Unit Biological Assembly Drag the structure with the mouse to rotate   Export Animated Image   Print3D Structural highlights 1a9h is a 2 chain structure. Full experimental information is available from OCA. For a guided tour on the structure components use FirstGlance. Method: Solution NMR, models Ligands: AAB Resources: FirstGlance, OCA, PDBe, RCSB, PDBsum, ProSAT Publication Abstract from PubMed Natural and exogenous processes can give rise to abasic sites with either a purine or pyrimidine as the base on the opposing strand. The solution state structures of the apyrimidinic DNA duplex, with D6 indicating an abasic site, [sequence: see text] referred to as AD, and the apurinic DNA duplex with a dC17, referred to as CD, have been determined. A particularly striking difference is that the abasic site in CD is predominantly a beta hemiacetal, whereas in AD the alpha and beta forms are equally present. Hydrogen bonding with water by the abasic site and the base on the opposite strand appears to play a large role in determining the structure near the damaged site. Comparison of these structures with that of a duplex DNA containing a thymine glycol at the same position as the abasic site and with that of a duplex DNA containing an abasic site in the middle of a curved DNA sequence offers some insight into the common and distinct structural features of damaged DNA sites. Structures of apurinic and apyrimidinic sites in duplex DNAs.,Beger RD, Bolton PH J Biol Chem. 1998 Jun 19;273(25):15565-73. PMID:9624147 From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.

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