191d | pdb_0000191d

CRYSTAL STRUCTURE OF INTERCALATED FOUR-STRANDED D(C3T)

spinqualitylabelsall models 191d, resolution 1.40Å Show:Asymmetric Unit Biological Assembly Drag the structure with the mouse to rotate   Export Animated Image   Print3D Structural highlights 191d is a 4 chain structure. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance. Ligands: NA Resources: FirstGlance, OCA, PDBe, RCSB, PDBsum, ProSAT Publication Abstract from PubMed The crystal structure of d(C3T), solved at 1.4 A resolution, reveals that the molecule forms a four-stranded intercalated complex. It consists of two parallel-stranded duplexes, each of which is held together by cytosine-protonated cytosine base pairs. The two duplexes are intercalated with each other and have opposite strand orientation. The molecule has a flat, lath-like appearance, and the covalently bonded cytosines have a slow right-handed twist of 17.1 degrees. However, there is considerable asymmetry. On one of the flat sides, the phosphate groups are rotated away from the center of the molecule. They are held in this orientation by bridging water molecules that bind the NH of cytosine and a phosphate group of an opposite chain. There is also considerable microheterogeneity in the structure. The cytosine hemiprotonation occurs even at pH 7 where stable crystals form. Crystal structure of intercalated four-stranded d(C3T) at 1.4 A resolution.,Kang CH, Berger I, Lockshin C, Ratliff R, Moyzis R, Rich A Proc Natl Acad Sci U S A. 1994 Nov 22;91(24):11636-40. PMID:7972115 From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.

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