391d | pdb_0000391d

STRUCTURAL VARIABILITY AND NEW INTERMOLECULAR INTERACTIONS OF Z-DNA IN CRYSTALS OF D(PCPGPCPGPCPG)

spinqualitylabelsall models 391d, resolution 2.75Å Show:Asymmetric Unit Biological Assembly Drag the structure with the mouse to rotate   Export Animated Image   Print3D Structural highlights 391d is a 6 chain structure. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance. Resources: FirstGlance, OCA, PDBe, RCSB, PDBsum, ProSAT Publication Abstract from PubMed We have determined the single crystal x-ray structure of the synthetic DNA hexamer d(pCpGpCpGpCpG) in two different crystal forms. The hexamer pCGCGCG has the Z-DNA conformation and in both cases the asymmetric unit contains more than one Z-DNA duplex. Crystals belong to the space group C222(1) with a = 69.73, b = 52.63, and c = 26.21 A, and to the space group P2(1) with a = 49.87, b = 41.26, c = 21.91 A, and gamma = 97.12 degrees. Both crystals show new crystal packing modes. The molecules also show striking new features when compared with previously determined Z-DNA structures: 1) the bases in one duplex have a large inclination with respect to the helical axis, which alters the overall shape of the molecule. 2) Some cytosine nitrogens interact by hydrogen bonding with phosphates in neighbor molecules. Similar base-phosphate interactions had been previously detected in some B-DNA crystals. 3) Basepair stacking between the ends of neighbor molecules is variable and no helical continuity is maintained between contiguous hexamer duplexes. Structural variability and new intermolecular interactions of Z-DNA in crystals of d(pCpGpCpGpCpG).,Malinina L, Tereshko V, Ivanova E, Subirana JA, Zarytova V, Nekrasov Y Biophys J. 1998 May;74(5):2482-90. PMID:9591674 From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine. See Also Z-DNA

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