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. 1987 Jul 24;15(14):5813–5822. doi: 10.1093/nar/15.14.5813

Z form of poly d(A-C).poly d(G-T) in solution studied by Raman spectroscopy.

J P Ridoux, J Liquier, E Taillandier
PMCID: PMC306025  PMID: 3615202

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-greater than 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-greater than Z transition.

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Selected References

These references are in PubMed. This may not be the complete list of references from this article.

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