362d | pdb_0000362d

THE STRUCTURE OF D(TGCGCA)2 AND A COMPARISON TO OTHER Z-DNA HEXAMERS

spinqualitylabelsall models 362d, resolution 1.30Å Show:Asymmetric Unit Biological Assembly Drag the structure with the mouse to rotate   Export Animated Image   Print3D Structural highlights 362d is a 2 chain structure. This structure supersedes the now removed PDB entry 347d. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance. Ligands: NCO Resources: FirstGlance, OCA, PDBe, RCSB, PDBsum, ProSAT Publication Abstract from PubMed The X-ray crystal structure of d(TGCGCA)2 has been determined at 120 K to a resolution of 1.3 A. Hexamer duplexes, in the Z-DNA conformation, pack in an arrangement similar to the 'pure spermine form' [Egli et al. (1991). Biochemistry, 30, 11388-11402] but with significantly different cell dimensions. The phosphate backbone exists in two equally populated discrete conformations at one nucleotide step, around phosphate 11. The structure contains two ordered cobalt hexammine molecules which have roles in stabilization of both the Z-DNA conformation of the duplex and in crystal packing. A comparison of d(TGCGCA)2 with other Z-DNA hexamer structures available in the Nucleic Acid Database illustrates the elusive nature of crystal packing. A review of the interactions with the metal cations Na+, Mg2+ and Co3+ reveals a relatively small proportion of phosphate binding and that close contacts between metal ions are common. A prediction of the water structure is compared with the observed pattern in the reported structure. Structure of d(TGCGCA)2 and a comparison to other DNA hexamers.,Harper A, Brannigan JA, Buck M, Hewitt L, Lewis RJ, Moore MH, Schneider B Acta Crystallogr D Biol Crystallogr. 1998 Nov 1;54(Pt 6 Pt 2):1273-84. PMID:10089504 From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine. See Also Z-DNA

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