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A stereochemical model for dna sodium ion hydrate complex


, : A stereochemical model for dna sodium ion hydrate complex. Molekulyarnaya Biologiya (Moscow) 9(1): 95-104

By computer calculation using atom-atom potentials, a stereochemical model of the [calf thymus] DNA-hydrate Na+ complex was obtained according to which the Na+(H2O)6 octahedrons are localized in the narrow groove of DNA with formation of a great number of van der Waals contracts and H bonds. The model explains why the C-form of DNA is stabilized in the Na-DNA complex which is formed in the presence of 80% methanol (vol/vol). The possibility that such complexes exist in vivo at the DNA regions surrounded with media of diminished H2O activity (the DNA-membrane complex, chromosomes, phage heads) is discussed.

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