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- W2042671391 abstract "Poly(dA-dT).poly(dA-dT) structures in aqueous solutions with high NaCl concentrations and in the presence of Ni2+ ions have been studied with resonance Raman spectroscopy (RRS). In low water activity the effects of added 95 mM NiCl2 in solution stabilize the syn geometry of the purines and reorganize the water distribution via local interactions of Ni-water charged complexes with the adenine N7 position. It is shown that RRS provides good marker bands for a left-handed helix: i) a purine ring breathing mode around 630 cm-1 coupled to the deoxyribose vibration in the syn geometry, ii) a 1300-1340 cm-1 region characterizing local chemical interactions of the Ni2+ ions with the adenine N7 position, iii) lines at about 1483- and 1582 cm-1 correlated to the anti/syn reorientation of the adenine residues on B-Z structure transition, iv) marker bands of the thymidine carbonyl group couplings at 1680- and 1733 cm-1 due to the disposition of the thymidine residues in the Z helix specific geometry. Hence poly(dA-dT).poly(dA-dT) can adopt a Z form in solution. The Z form observed in alternate purine-pyrimidine sequences does not require G-C base pairs." @default.
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- W2042671391 date "1989-12-01" @default.
- W2042671391 modified "2023-10-18" @default.
- W2042671391 title "The Z-Conformation of Poly(dA-dT) · Poly(dA-dT) in Solution as Studied by Ultraviolet Resonance Raman Spectroscopy" @default.
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- W2042671391 doi "https://doi.org/10.1080/07391102.1989.10508511" @default.
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