1o56

MOLECULAR STRUCTURE OF TWO CRYSTAL FORMS OF CYCLIC TRIADENYLIC ACID AT 1 ANGSTROM RESOLUTION

spinqualitylabelsall models 1o56, resolution 0.90Å Show:Asymmetric Unit Biological Assembly Drag the structure with the mouse to rotate   Export Animated Image   Print3D Structural highlights 1o56 is a 2 chain structure. This structure supersedes the now removed PDB entry 416d. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance. Method: X-ray diffraction, Resolution 0.9Å Resources: FirstGlance, OCA, PDBe, RCSB, PDBsum, ProSAT Publication Abstract from PubMed The three dimensional structures of cyclic deoxytriadenylic acid, c-d(ApApAp), from two different trigonal crystal forms (space groups P3 and R32) have been determined by x-ray diffraction analysis at 1A resolution. Both structures were solved by direct methods and refined by anisotropic least squares refinement to R-factors of 0.109 and 0.137 for the P3 and R32 forms, respectively. In both crystal forms, each of the two independent c-d(ApApAp) molecules sits on the crystallographic 3-fold axis. All four independent c-d(ApApAp) molecules have similar backbone conformations. The deoxyriboses are in the S-type pucker with pseudorotation angles ranging from 156.7 degrees to 168.6 degrees and the bases have anti glycosyl torsion angles (chi falling in two ranges, one at -104.3 degrees and the other ranging from -141.0 degrees to -143.8 degrees). In the R32 form, a hexahydrated cobalt(II) ion is found to coordinate through bridging water molecules to N1, N3, and N7 atoms of three adjacent adenines and oxygen atoms of phosphates. Comparison with other structures of cyclic oligonucleotides indicates that the sugar adopts N-type pucker in cyclic dinucleotides and S-type pucker in cyclic trinucleotides, regardless whether the sugar is a ribose or a deoxyribose. Molecular structure of two crystal forms of cyclic triadenylic acid at 1A resolution.,Gao YG, Robinson H, Guan Y, Liaw YC, van Boom JH, van der Marel GA, Wang AH J Biomol Struct Dyn. 1998 Aug;16(1):69-76. PMID:9745896 From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.

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