1wan

DNA DTA TRIPLEX, NMR, 7 STRUCTURES

spinqualitylabelsall models 1wan, 7 NMR models Show:Asymmetric Unit Biological Assembly Drag the structure with the mouse to rotate   Export Animated Image   Print3D Structural highlights 1wan is a 1 chain structure. Full experimental information is available from OCA. For a guided tour on the structure components use FirstGlance. NonStd Res: D3 Resources: FirstGlance, OCA, RCSB, PDBsum Publication Abstract from PubMed We have used NMR spectroscopy to study a pyrimidine-purine-pyrimidine DNA triplex containing a non-natural base, 1-(2-deoxy-beta-D-ribofuranosyl)-4-(3-benzamido)phenylimidazole (D3), in the third strand. The D3 base has been previously shown to specifically recognize T-A and C-G base-pairs via intercalation on the 3' side (with respect to the purine strand) of the target base pair, instead of forming sequence-specific hydrogen bonds. 1H resonance assignments have been made for the D3 base and most of the non-loop portion of the triplex. The solution structure of the triplex was calculated using restrained molecular dynamics and complete relaxation matrix refinement. The duplex portion of the triplex has an over-all helical structure that is more similar to B-DNA than to A-DNA. The three aromatic rings of the D3 base stack on the bases of all three strands and mimic a triplet. The conformation of the D3 base and its sequence specificity are discussed. Solution structure of a pyrimidine-purine-pyrimidine triplex containing the sequence-specific intercalating non-natural base D3.,Wang E, Koshlap KM, Gillespie P, Dervan PB, Feigon J J Mol Biol. 1996 Apr 19;257(5):1052-69. PMID:8632468 From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.

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