1em0

COMPLEX OF D(CCTAGG) WITH TETRA-[N-METHYL-PYRIDYL] PORPHYRIN

spinqualitylabelsall models 1em0, resolution 0.90Å Show:Asymmetric Unit Biological Assembly Drag the structure with the mouse to rotate   Export Animated Image   Print3D Structural highlights 1em0 is a 4 chain structure. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance. Ligands: MG, PNI NonStd Res: CBR Resources: FirstGlance, OCA, PDBe, RCSB, PDBsum, ProSAT Publication Abstract from PubMed The crystal structure of a B-type DNA hexanucleotide duplex complexed with the porphyrin molecule nickel-[tetra-N-methyl-pyridyl] porphyrin has been solved by multiwavelength anomalous diffraction phasing and refined to an R factor of 11.5% at a resolution of 0.9 A. The structure has been solved and refined as two crystallographically independent duplexes, stacked end to end. Contrary to expectation, the porphyrin molecule is not intercalated into the duplex but is stacked onto the ends of the two-duplex stack. The porphyrin molecule is highly buckled as a consequence of the nickel coordination, which produces large changes in local DNA structure. A second mode of porphyrin binding is apparent as a consequence of crystal packing, which places the ligand in the minor groove of an adjacent duplex. This structure thus provides, to our knowledge, the first atomic visualization of minor-groove binding for a porphyrin molecule. The geometry of groove binding provides a ready explanation for porphyrin-induced DNA strand cleavage at deoxyribose residues. A DNA-porphyrin minor-groove complex at atomic resolution: the structural consequences of porphyrin ruffling.,Bennett M, Krah A, Wien F, Garman E, McKenna R, Sanderson M, Neidle S Proc Natl Acad Sci U S A. 2000 Aug 15;97(17):9476-81. PMID:10920199 From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.

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