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. 1980 Aug 25;8(16):3695–3707. doi: 10.1093/nar/8.16.3695

Circular dichroism spectra show that repeating dinucleotide DNAs may form helices in which every other base is looped out.

D M Gray, M Vaughan
PMCID: PMC324184  PMID: 7433104

Abstract

We have found that the CD spectrum of poly [d(C-T)] undergoes a marked change upon protonation, taking on the unmistakable features of the spectrum of poly[d(C) x d(C+)]. The acid poly[d9C-T)] structure appears to be one in which each of the T residues is individually looped out of a helix formed by stacked C x C+ base pairs. We also present data for poly[d(C-A)] and review data for the other four possible repeating DNA dinucleotide sequences. These data show that self-complexes in which up to 50% of the residues are extrahelical may be unexceptional.

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Selected References

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