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- W2006861703 abstract "Poly d(A–C).poly d(G–T) structures have been studied In solution by Raman spectroscopy, in presence of Na+, Mn2+ and Ni2+ counterions. Increase of the Na+ concentration or addition of Mn2+ ions up to 1M MnCl2 does not modify the B geometry of the polynucleotide. On the contrary, in conditions of low water activity (4M NaCl), the presence of small amounts of nickel ions (65 mM) induces a left-handed geometry of the DNA. The shift of the guanine line located at 682 cm−1 in B form to 622 cm−1 reflects unambiguously the C2′-endo/anti→C3′-endo/syn reorientation of the deoxyribose-purine entities. Moreover modifications in the phosphate backbone lines indicate that the polymer is in a Z conformation. New or displaced lines corresponding to adenosine vibrations are correlated with the left-handed structure. An interaction of the Ni2+ ions specifically with the N7 site of purines, combined with a low water activity is necessary to promote the B→Z transition." @default.
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- W2006861703 date "1987-01-01" @default.
- W2006861703 modified "2023-10-03" @default.
- W2006861703 title "Z form of poly d(A–C).poly d(G–T) in solution studied by Raman spectroscopy" @default.
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- W2006861703 doi "https://doi.org/10.1093/nar/15.14.5813" @default.
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