23Na NMR studies of Na-DNA in the solid state.
23Na MAS, CP/MAS and quadrupole nutation NMR spectra and the 23Na spin-lattice relaxation times in Na-DNA with and without competing species (Mg2+, ethidium bromide and [Ru(phen)3]2+) reveal the presence of two sodium sites with different NMR parameters. While in the presence of Mg2+, sodium resides far from the surface of the DNA molecule, ethidium bromide and [Ru(phen)3]2+ displace sodium closer towards the surface.
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Department of Chemistry, University of Cambridge, UK.
Klinowski
J
J
Saba
G
G
Casu
M
M
Lai
A
A
D000818:Animals; D002417:Cattle; D004247:DNA / Q000737:chemistry*; D004996:Ethidium / Q000737:chemistry; D008274:Magnesium / Q000737:chemistry; D019906:Nuclear Magnetic Resonance, Biomolecular; D009690:Nucleic Acid Conformation; D012964:Sodium / Q000737:chemistry*
D004247:DNA; D012964:Sodium; D004996:Ethidium; D008274:Magnesium