109d

VARIABILITY IN DNA MINOR GROOVE WIDTH RECOGNISED BY LIGAND BINDING: THE CRYSTAL STRUCTURE OF A BIS-BENZIMIDAZOLE COMPOUND BOUND TO THE DNA DUPLEX D(CGCGAATTCGCG)2VARIABILITY IN DNA MINOR GROOVE WIDTH RECOGNISED BY LIGAND BINDING: THE CRYSTAL STRUCTURE OF A BIS-BENZIMIDAZOLE COMPOUND BOUND TO THE DNA DUPLEX D(CGCGAATTCGCG)2

Structural highlights 109d is a 2 chain structure. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance. Ligands: , Resources: FirstGlance, OCA, PDBe, RCSB, PDBsum, ProSAT Publication Abstract from PubMed An analogue of the DNA-binding compound Hoechst 33258, in which the piperazine ring has been replaced by an imidazoline group, has been cocrystallized with the dodecanucleotide sequence d(CGCGAATTCGCG)2. The structure has been solved by X-ray diffraction analysis and has been refined to an R-factor of 19.7% at a resolution of 2.0 A. The ligand is found to bind in the minor groove, at the central four AATT base pairs of the B-DNA double helix, with the involvement of a number of van der Waals contacts and hydrogen bonds. There are significant differences in minor groove width for the two compounds, along much of the AATT region. In particular this structure shows a narrower groove at the 3' end of the binding site consistent with the narrower cross-section of the imidazole group compared with the piperazine ring of Hoechst 33258 and therefore a smaller perturbation in groove width. The higher binding affinity to DNA shown by this analogue compared with Hoechst 33258 itself, has been rationalised in terms of these differences. Variability in DNA minor groove width recognised by ligand binding: the crystal structure of a bis-benzimidazole compound bound to the DNA duplex d(CGCGAATTCGCG)2.,Wood AA, Nunn CM, Czarny A, Boykin DW, Neidle S Nucleic Acids Res. 1995 Sep 25;23(18):3678-84. PMID:7478996 From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.

spinqualitylabelsall models 109d, resolution 2.00Å Show:Asymmetric Unit Biological Assembly Drag the structure with the mouse to rotate   Export Animated Image