Conformational transitions of poly(dA-dT).poly(dA-dT) in ethanolic solutions
- 1 January 1982
- journal article
- Published by Oxford University Press (OUP) in Nucleic Acids Research
- Vol. 10 (21) , 6969-6979
- https://doi.org/10.1093/nar/10.21.6969
Abstract
Examination of circular dichroic and phosphorus nuclear magnetic resonance spectra showed that poly(dA-dT)-poly(dA-dT) exhibited an ethanol-induced transition to the A form in an Na+ containing medium like natural DNAs. A mere replacement of the Na+ by Cs+ counterions meant that the polynucleotide was with a little cooperativity transformed into a novel conformation displaying a deep negative band in the long wavelength part of the CD spectrum. The presence of very low concentration of Cs2+ shifted the midpoint of the transition to a lower content of ethanol.Keywords
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