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. 1990 Sep;87(17):6693–6697. doi: 10.1073/pnas.87.17.6693

Crystal structure and sequence-dependent conformation of the A.G mispaired oligonucleotide d(CGCAAGCTGGCG).

G D Webster 1, M R Sanderson 1, J V Skelly 1, S Neidle 1, P F Swann 1, B F Li 1, I J Tickle 1
PMCID: PMC54603  PMID: 2395870

Abstract

The crystal structure of the dodecanucleotide d(CGCAAGCTGGCG) has been determined to a resolution of 2.5 A and refined to an R factor of 19.3% for 1710 reflections. The sequence crystallizes as a B-type double helix, with two G(anti).A(syn) base pairs. These are stabilized by three-center hydrogen bonds to pyrimidines that induce perturbations in base-pair geometry. The central AGCT region of the helix has a wide (greater than 6 A) minor groove.

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Selected References

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