159d | pdb_0000159d

SIDE BY SIDE BINDING OF TWO DISTAMYCIN A DRUGS IN THE MINOR GROOVE OF AN ALTERNATING B-DNA DUPLEX

spinqualitylabelsall models 159d, resolution 1.80Å Show:Asymmetric Unit Biological Assembly Drag the structure with the mouse to rotate   Export Animated Image   Print3D Structural highlights 159d is a 1 chain structure. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance. Ligands: DMY, MG NonStd Res: DI Resources: FirstGlance, OCA, RCSB, PDBsum Publication Abstract from PubMed Here we report the 1.8A X-ray structure of a 2:1 drug-DNA complex between distamycin A and an alternating B-DNA octamer duplex d(ICICICIC)2. The two distamycin A molecules are bound side by side with dyad symmetry in an antiparallel orientation in the expanded minor groove. The amides of each drug molecule are hydrogen bonded to the minor groove base atoms of only one DNA strand. The complex not only shows binding of two drug molecules, but the DNA duplex also exhibits striking low-high alternations in the helical twist angles, the sugar puckering and the phosphate conformations, providing the basis for a new model for an alternating B-DNA with a dinucleotide repeat. Binding of two distamycin A molecules in the minor groove of an alternating B-DNA duplex.,Chen X, Ramakrishnan B, Rao ST, Sundaralingam M Nat Struct Biol. 1994 Mar;1(3):169-75. PMID:7656035 From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.

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