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Nucleic Acids Research, 1983, Vol. 11, No. 11 3779-3793
© 1983

CHEMISTRY

A 1H nOe and CD study of the salt-concentration dependence of the structure of d(G-C)5

David G. Reid, Stephen A. Salisbury and Dudley H. Williams*

University Chemical Laboratory, Lensfield Road Cambridge CB2 1EW, UK

*To whom correspondence should be sent

Received March 25, 1983. Accepted May 10, 1983.

Intra– and internucleotide 1H nuclear Overhauser effects (nOes) have been observed in the synthetic decanucleoside nonaphosphate d(G–C)5 at low and high salt concentrations, and in conditions under which duplex formation is complete. Comparison of the nOes with interproton distances derived from model and X–ray structures suggest that the duplex is right–handed up to a sodium chloride concentration of 4M, in contrast to the behaviour of poly [d(G-C)}. C.D. spectra are consistent with this suggestion.


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