Structural features and hydration of a dodecamer duplex containing two C.A mispairs (original) (raw)

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Department of Chemistry, University of Edinburgh

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Revision received:

08 July 1987

Published:

25 August 1987

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William N. Hunter, Tom Brown, Olga Kennard, Structural features and hydration of a dodecamer duplex containing two C.A mispairs, Nucleic Acids Research, Volume 15, Issue 16, 25 August 1987, Pages 6589–6605, https://doi.org/10.1093/nar/15.16.6589
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Abstract

X-ray diffraction techniques have been used to characterise the crystal and molecular structure of the deoxyoligomer d(C-G-C-A-A-A-T-T-C-G-C-G) at 2.5Å resolution. The final R factor is 0.19 with the location of 78 solvent molecules. The oligomer crystallises in a B-DNA type conformation with two strands coiled about each other to produce a duplex. This double helix consists of four A.T and six G.C Watson-Crick base pairs and two C.A mispairs. The mismatched base pairs adopt a “wobble” type structure with the cytosine displaced laterally into the major groove, the adenine into the minor groove. We have proposed that the two close contacts observed in the C.A pairing represent two hydrogen bonds one of which results from protonation of adenine. The mispairs are accommodated in the double helix with small adjustments in the conformation of the sugar-phosphate backbone* Details of the backbone conformation, base stacking interactions, thermal parameters and the hydration are now presented and compared with those of the native oligomer d(C-G-C-G-A-A-T-T-C-G-C-G) and with variations of this sequence containing G.T and G.A mispairs.

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