1b60

3,N4-ETHENO-2'-DEOXYCYTIDINE OPPOSITE CYTIDINE IN AN 11-MER DUPLEX, SOLUTION STRUCTURE FROM NMR AND MOLECULAR DYNAMICS

spinqualitylabelsall models 1b60, 1 NMR models Show:Asymmetric Unit Biological Assembly Drag the structure with the mouse to rotate   Export Animated Image   Print3D Structural highlights 1b60 is a 2 chain structure. Full experimental information is available from OCA. For a guided tour on the structure components use FirstGlance. NonStd Res: EDC Resources: FirstGlance, OCA, PDBe, RCSB, PDBsum, ProSAT Publication Abstract from PubMed Lipid peroxidation products, as well as the metabolic products of vinyl chloride, react with cellular DNA producing the mutagenic adduct 3,N(4)-etheno-2'-deoxycytidine (epsilondC), along with several other exocyclic derivatives. High-resolution NMR spectroscopy and restrained molecular dynamics simulations were used to establish the solution structure of an 11-mer duplex containing an epsilondC.dC base-pair at its center. The NMR data suggested a regular right-handed helical structure having all residues in the anti orientation around the glycosydic torsion angle and Watson-Crick alignments for all canonical base-pairs of the duplex. Restrained molecular dynamics generated a three-dimensional model in excellent agreement with the spectroscopic data. The (epsilondC. dC)-duplex structure is a regular right-handed helix with a slight bend at the lesion site and no severe distortions of the sugar-phosphate backbone. The epsilondC adduct and its partner dC were displaced towards opposite grooves of the helix, resulting in a lesion-containing base-pair that was highly sheared but stabilized to some degree by the formation of a single hydrogen bond. Such a sheared base-pair alignment at the lesion site was previously observed for epsilondC.dG and epsilondC.T duplexes, and was also present in the crystal structures of duplexes containing dG.T and dG. U mismatches. These observations suggest the existence of a substrate structural motif that may be recognized by specific DNA glycosylases during the process of base excision repair. Solution structure of an 11-mer duplex containing the 3, N(4)-ethenocytosine adduct opposite 2'-deoxycytidine: implications for the recognition of exocyclic lesions by DNA glycosylases.,Cullinan D, Johnson F, de los Santos C J Mol Biol. 2000 Feb 25;296(3):851-61. PMID:10677286 From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.

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