241d | pdb_0000241d

EXTENSION OF THE FOUR-STRANDED INTERCALATED CYTOSINE MOTIF BY ADENINE.ADENINE BASE PAIRING IN THE CRYSTAL STRUCTURE OF D(CCCAAT)

spinqualitylabelsall models 241d, resolution 1.85Å Show:Asymmetric Unit Biological Assembly Drag the structure with the mouse to rotate   Export Animated Image   Print3D Structural highlights 241d is a 2 chain structure. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance. Resources: FirstGlance, OCA, PDBe, RCSB, PDBsum, ProSAT Publication Abstract from PubMed The crystal structure of d(CCCAAT), refined at 2.0 A resolution, shows a four stranded molecule in which two parallel duplexes intercalate with opposite polarity, using cytosine.protonated cytosine base pairs. The intercalation motif in this structure is extended by adenine.adenine base pairs. Two topologically distinct broad grooves are found in the lath-like central part of the molecule with the phosphate groups on one side bent over towards each other, stabilized by bridging water molecules. At the 3' ends, two arrangements of intermolecular A.A.T base triplets are found, involving both asymmetric and symmetric A.A base pairs joined to thymine residues by Watson-Crick and reverse Hoogsteen base pairing, respectively. Extension of the four-stranded intercalated cytosine motif by adenine.adenine base pairing in the crystal structure of d(CCCAAT).,Berger I, Kang C, Fredian A, Ratliff R, Moyzis R, Rich A Nat Struct Biol. 1995 May;2(5):416-25. PMID:7664099 From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.

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