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- W2041223185 abstract "High resolution 2H nuclear magnetic resonance (NMR) was used to investigate the interaction of D2O with solid samples of uniaxially oriented Li-DNA (B-form DNA) and Na-DNA (A- and B-form DNA). At low levels of hydration, 0 approximately 4 D2O/nucleotide, the 2H spectra shows a very weak (due to short T2) broad single resonance, suggestive of unrestricted rotational diffusion of the water. At approximately 5 or more D2O/nucleotide, the Li-DNA (B-form) spectra suddenly exhibit a large doublet splitting, characteristic of partially ordered water. With increasing hydration, the general trend is a decrease of this splitting. From our analysis we show that the DNA water structure reorganizes as the DNA is progressively hydrated. The D2O interaction with Na-DNA is rather different than with Li-DNA. Below 10 D2O/nucleotide Na-DNA is normally expected to be in the A-form, and a small, or negligible splitting is observed. In the range 9-19 D2O/nucleotide, the splitting increases with increasing hydration. Above approximately 20 D2O/nucleotide Na-DNA converts entirely to the B-form and the D2O splittings are then similar to those found in Li-DNA. We show that the complex Na-DNA results obtained in the range 0-20 D2O/nucleotide are caused by a mixture of A- and B-DNA in those samples." @default.
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- W2041223185 date "1989-10-01" @default.
- W2041223185 modified "2023-09-29" @default.
- W2041223185 title "Interaction of water with oriented DNA in the A- and B-form conformations" @default.
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- W2041223185 doi "https://doi.org/10.1016/s0006-3495(89)82715-8" @default.
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