151d | pdb_0000151d

DIVERSITY OF WATER RING SIZE AT DNA INTERFACES: HYDRATION AND DYNAMICS OF DNA-ANTHRACYCLINE COMPLEXES

spinqualitylabelsall models 151d, resolution 1.40Å Show:Asymmetric Unit Biological Assembly Drag the structure with the mouse to rotate   Export Animated Image   Print3D Structural highlights 151d is a 1 chain structure. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance. Ligands: DM2 Resources: FirstGlance, OCA, RCSB, PDBsum Publication Abstract from PubMed In crystallographic structures of biological macromolecules, one can observe many hydration rings that originate at one water molecule, pass via hydrogen bonds through several others, and return to the original water molecule. Five-membered water rings have been thought to occur with greater frequency than other ring sizes. We describe a quantitative assessment of relationships between water ring size and frequency of occurrence in the vicinity of nucleic acid interfaces. This report focuses on low-temperature X-ray crystallographic structures of two anthracyclines, adriamycin (ADRI) and daunomycin (DAUN), bound to d(CGATCG) and on several DNA structures published previously by others. We have obtained excellent low-temperature (-160 degrees C, LT) X-ray intensity data for d(CGATCG)-adriamycin and d(CGATCG)-daunomycin with a multiwire area detector. The LTX-ray data sets contain 20% (daunomycin, LT-DAUN) and 35% (adriamycin, LT-ADRI) more reflections than were used to derive the original room-temperature (15 degrees C) structures [Frederick, C.A., Williams, L.D., Ughetto, G., van der Marel, G. A., van Boom, J.H., Rich, A., & Wang, A.H.-J. (1990) Biochemistry 29, 2538-2549]. The results show that five-membered water rings are not preferred over other ring sizes. This assessment is consistent with our observation of broad dispersion W-W-W angles (sigma = 20 degrees). In addition, we report that the thermal mobility, distinct from the static disorder, of the amino sugar of daunomycin and adriamycin is significantly greater than that of the rest of the complex. This mobility implies that if the central AT base pair is switched to a CG base pair, there should be a low energy cost in avoiding the guanine amino group. The energy difference (for the sugar-binding preference) between d(CGTACG) and d(CGCGCG) could be considerably less than 20 kcal/mol, a value proposed previously from computation. Water ring structure at DNA interfaces: hydration and dynamics of DNA-anthracycline complexes.,Lipscomb LA, Peek ME, Zhou FX, Bertrand JA, VanDerveer D, Williams LD Biochemistry. 1994 Mar 29;33(12):3649-59. PMID:8142363 From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.

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