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. 1986 Dec 22;14(24):10071–10090. doi: 10.1093/nar/14.24.10071

CD of homopolymer DNA-RNA hybrid duplexes and triplexes containing A-T or A-U base pairs.

H T Steely Jr, D M Gray, R L Ratliff
PMCID: PMC341356  PMID: 2433679

Abstract

CD spectra and difference-CD spectra of (a) two DNA X RNA hybrid duplexes (poly[r(A) X d(U)] and poly[r(A) X d(T)]) and (b) three hybrid triplexes (poly-[d(T) X r(A) X d(T)], poly[r(U) X d(A) X r(U)], and poly[r(T) X d(A) X r(T)]) were obtained and compared with CD spectra of six A X U- and A X T-containing duplex and triplex RNAs and DNAs. We found that the CD spectra of the homopolymer duplexes above 260 nm were correlated with the type of base pair present (A-U or A-T) and could be interpreted as the sum of the CD contributions of the single strands plus a contribution due to base pairing. The spectra of the duplexes below 235 nm were related to the polypurine strands present (poly-[r(A)] or poly[d(A)]). We interpret the CD intensity in the intermediate 255-235 nm region of these spectra to be mainly due to stacking of the constituent polypurine strands. Three of the five hybrids (poly[r(A) X d(U)], poly[r(A) X d(T)], and poly[d(T) X r(A) X d(T)]) were found to have heteronomous conformations, while poly[r(U) X d(A) X r(U)] was found to be the most A-like and poly[r(T) X d(A) X r(T)], the least A-like.

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Selected References

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