4lti

Dehydration/Rehydration of a Nucleic Acid system containing a Polypyridyl Ruthenium Complex at 74% relative humidity (4/7)

spinqualitylabelsall models 4lti, resolution 1.41Å Show:Asymmetric Unit Biological Assembly Drag the structure with the mouse to rotate   Export Animated Image   Print3D Structural highlights 4lti is a 1 chain structure. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance. Ligands: BA, CL, RKL Related: 3qrn, 4ltg, 4lth, 4ltf, 4ltj, 4ltk, 4ltl Resources: FirstGlance, OCA, PDBe, RCSB, PDBsum, ProSAT Publication Abstract from PubMed Hydration-dependent DNA deformation has been known since Rosalind Franklin recognised that the relative humidity of the sample had to be maintained to observe a single conformation in DNA fibre diffraction. We now report for the first time the crystal structure, at the atomic level, of a dehydrated form of a DNA duplex and demonstrate the reversible interconversion to the hydrated form at room temperature. This system, containing d(TCGGCGCCGA) in the presence of Lambda-[Ru(TAP)2(dppz)]2+ (TAP = 1,4,5,8-tetraazaphenanthrene, dppz = dipyridophenazine), undergoes a partial transition from an A/B hybrid to the A-DNA conformation, at 84-79% relative humidity. This is accompanied by an increase in kink at the central step from 22 degrees to 51 degrees , with a large movement of the terminal bases forming the intercalation site. This transition is reversible on rehydration. Seven datasets, collected from one crystal at room temperature, show the consequences of dehydration at near-atomic resolution. This result highlights that crystals, traditionally thought of as static systems, are still dynamic and therefore can be the subject of further experimentation. Controlled dehydration of a ruthenium complex-DNA crystal induces reversible DNA kinking.,Hall JP, Sanchez-Weatherby J, Alberti C, Quimper CH, O'Sullivan K, Brazier JA, Winter G, Sorensen T, Kelly JM, Cardin DJ, Cardin CJ J Am Chem Soc. 2014 Nov 13. PMID:25393319 From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.

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