1D40

BASE SPECIFIC BINDING OF COPPER(II) TO Z-DNA: THE 1.3-ANGSTROMS SINGLE CRYSTAL STRUCTURE OF D(M5CGUAM5CG) IN THE PRESENCE OF CUCL2

1D40 の概要

• エントリーDOI: 10.2210/pdb1d40/pdb
• 分子名称: DNA (5'-D(*(5CM)P*(CU)GP*UP*AP*(5CM)P*(CU)G)-3'), COPPER (II) ION, COPPER (II) CHLORIDE, ... (4 entities in total)
• 機能のキーワード: z-dna, double helix, modified, dna
• タンパク質・核酸の鎖数: 2
• 化学式量合計: 3971.58

構造登録者

Geierstanger, B.H.,Kagawa, T.F.,Chen, S.-L.,Quigley, G.J.,Ho, P.S. (登録日: 1991-05-07, 公開日: 1992-04-15, 最終更新日: 2024-04-03)

主引用文献

Geierstanger, B.H.,Kagawa, T.F.,Chen, S.L.,Quigley, G.J.,Ho, P.S.
Base-specific binding of copper(II) to Z-DNA. The 1.3-A single crystal structure of d(m5CGUAm5CG) in the presence of CuCl2.
J.Biol.Chem., 266:20185-20191, 1991

PubMed Abstract: The single crystal structure of d(m5CGUAm5CG) soaked with copper(II) chloride was solved to atomic (1.3 A) resolution to study the base specificity of copper binding to double-stranded DNA. In the present copper(II) chloride-soaked structure, four crystallographically unique copper(II) complexes were observed bound to five of the six purine bases in the hexamer duplex. Covalent copper(II) binding occurred at N-7 of all four guanine bases and at one of the two adenine bases in the DNA duplex. Copper binding was not observed at the position (Ade4) located in an open solvent channel, whereas the second adenine site (Ade10) shared a complex with a guanine residue (Gua12) of a neighboring symmetry-related hexamer. The coordination geometries and distribution of these copper(II) complexes at the guanine bases in the crystal were comparable to the analogous sites in the isomorphous copper(II) chloride-soaked d(CGCGCG) crystal (Kagawa, T., Geierstanger, B. H., Wang, A. H.-J., and Ho, P.S. (1991) J. Biol. Chem. 266, 20175-20184). Thus, the decreased copper(II) binding affinity for Ade4 was not an artifact of crystal packing, but is intrinsic to the chemical properties of this purine base in duplex DNA. This suggests that the adenine bases in dilute solutions of Z-DNA and more generally other duplex DNA conformations are not susceptible to copper(II) modification. Thus, preferential copper(II) binding at guanine bases over adenine bases in double-stranded DNA may explain the observed specificity of copper(II)-induced oxidative DNA damage near guanine residues (Yamamoto, K., and Kawanishi, S. (1989) J. Biol. Chem. 264, 15435-15440; Sagripanti, J.-L., and Kraemer, K. H. (1989) J. Biol. Chem. 264, 1729-1734). The sharing of a single copper(II) complex by Ade10 and Gua12 of an adjacent hexamer suggests that additional and perhaps specific DNA-DNA interactions, as may be found in the densely packed environment of the nuclear matrix in the cell, may render N-7 of adenine bases prone to copper(II) modification.

PubMed: 1939079

実験手法

X-RAY DIFFRACTION (1.3 Å)