1g8n

MOLECULAR AND CRYSTAL STRUCTURE OF D(CGCGAATF5UCGCG):5-FORMYLURIDINE/ ADENOSINE BASE-PAIRS IN B-DNA

spinqualitylabelsall models 1g8n, resolution 1.55Å Show:Asymmetric Unit Biological Assembly Drag the structure with the mouse to rotate   Export Animated Image   Print3D Structural highlights 1g8n is a 2 chain structure. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance. Ligands: MG NonStd Res: UFR Resources: FirstGlance, OCA, RCSB, PDBsum Publication Abstract from PubMed To investigate the role of divalent cations in crystal packing, four different crystals of a Dickerson-type dodecamer with the sequence d(CGCGAATXCGCG), containing 2'-deoxy-5-formyluridine at X, were obtained under several conditions with and without divalent cations. The crystal structures are all isomorphous. The octahedrally hydrated magnesium cations found in the major groove cement the two neighbouring duplexes along the b axis. In the Mg(2+)-free crystals, a five-membered ring of water molecules occupies the same position as the magnesium site and connects the two duplexes similarly to the hydrated Mg(2+) ion. It has been concluded that water molecules can take the place of the hydrated magnesium cation in crystallization, but the magnesium cation is more effective and gives X-ray diffraction at slightly higher resolution. In all four crystals, the 5-formyluracil residues form the canonical Watson-Crick pair with adenine residues. Crystallization and preliminary X-ray analysis of a DNA dodecamer containing 2'-deoxy-5-formyluridine; what is the role of magnesium cation in crystallization of Dickerson-type DNA dodecamers?,Tsunoda M, Karino N, Ueno Y, Matsuda A, Takenaka A Acta Crystallogr D Biol Crystallogr. 2001 Feb;57(Pt 2):345-8. PMID:11173500 From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.

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