title: 15N NMR study on site-selective binding of metal ions to guanine runs in DNA: a good correlation with HOMO distribution.
abstract: 15N NMR of DNA containing 15N-N7-enriched guanine (G) in the presence of paramagnetic ions (Mn(II) and Co(II)) was investigated. As the concentration of metal ion was increased, 15N NMR signals of the 5'G of GG and the middle G of GGG broadened site-selectively, indicating that electron-donating sites in G runs preferentially localize on the 5'G of GG and the middle G of GGG. The selectivity for G-metal ion interaction observed in this study was in good agreement with calculated HOMO distribution of G runs.
authors.affiliation: Department of Synthetic Chemistry and Biological Chemistry, Faculty of Engineering, Kyoto University, Kyoto 606-8501, Japan.
authors.forename: Akimitsu
authors.initials: A
authors.lastname: Okamoto
authors.forename: Keiichiro
authors.initials: K
authors.lastname: Kanatani
authors.forename: Toshiji
authors.initials: T
authors.lastname: Taiji
authors.forename: Isao
authors.initials: I
authors.lastname: Saito
mesh_terms: D002413:Cations, Divalent; D003035:Cobalt / Q000737:chemistry*; D004247:DNA / Q000737:chemistry*; D006147:Guanine / Q000737:chemistry*; D008345:Manganese / Q000737:chemistry*; D009587:Nitrogen Isotopes; D019906:Nuclear Magnetic Resonance, Biomolecular / Q000379:methods; D009841:Oligonucleotides / Q000138:chemical synthesis / Q000737:chemistry*
chemical_list: D002413:Cations, Divalent; D009587:Nitrogen Isotopes; D009841:Oligonucleotides; D003035:Cobalt; D008345:Manganese; D006147:Guanine; D004247:DNA