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Circular dichroism spectra of poly[d(AC):d(GT)], poly[r(AC):r(GU)], and hybrids poly[d(AC):r(GU)] and poly[r(AC):d(GT)] in the presence of ethanol

✍ Scribed by Donald M. Gray; Robert L. Ratliff

Publisher
Wiley (John Wiley & Sons)
Year
1975
Tongue
English
Weight
691 KB
Volume
14
Category
Article
ISSN
0006-3525

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✦ Synopsis

Abstract

Ultraviolet circular dichroism spectra have been obtained in aqueous solutions in the presence and absence of ethanol for a synthetic DNA, poly[d(AC):d(GT)], a synthetic RNA, poly[r(AC):r(GU)], and two DNA:RNA hybrids, poly[d(AC):r(GU)] and poly[r(AC):d(GT)]. In the absence of ethanol, we find that the RNA and DNA spectra are dissimilar, while the spectra of the hybrids show differing degrees of similarity to that of the RNA. In the presence of 60–80% ethanol by weight, the spectra of the DNA and both hybrids become much closer to the spectrum of the RNA, which remains relatively unchanged. We interpret the results as indicating that DNA can undergo a change to an A‐type conformation in the presence of ethanol and that the DNA:RNA hybrids are not wholly restricted to an RNA‐like conformation in the absence of ethanol.

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