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- W2029593846 abstract "Determination of the binding positions of light metal ions in the structure of oligonucleotides remains a challenge owing to their irregular coordination geometries, low electron densities and mobility in the crystals. To study the interactions between monovalent cations and DNA, the heavier alkali metal ion Rb(+) was used to replace Na(+) and K(+) in the Z-DNA crystal and the structure was analyzed using X-ray cryocrystallography. The resolution of the Rb-d(CGCGCG)(2) crystal data set is 1.76 A, with an R(merge) of 0.061. The final residual factor (R factor) for the crystal structure is 0.175. The positions of 16 Rb(+) ions were tentatively assigned, with most of them having partial occupancies. Three rubidium ions with full occupancies coordinated to two DNA double strands were located in the Z-DNA crystal. The results of this work suggest that there are numerous relatively low-energy sites for binding of monovalent cations to Z-DNA and that these sites are cation-water hybrid positions." @default.
- W2029593846 created "2016-06-24" @default.
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- W2029593846 date "2003-06-27" @default.
- W2029593846 modified "2023-09-23" @default.
- W2029593846 title "X-ray crystallographic study of the possible binding sites of the monovalent cations in the Z-DNA structure" @default.
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- W2029593846 doi "https://doi.org/10.1107/s0907444903009211" @default.
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