The amino 1H resonances of oligonucleotide helices: d(CGCG)

Journal of Biomolecular Structure & Dynamics
B McConnell

Abstract

An examination of the 1H NMR assignments and exchange properties of the amino resonances of the self-complementary tetramer, d(CGCG) was undertaken with regard to buffer effects, transfer of saturation from the water resonance and temperature dependence of amino 1H line shape and chemical shift. The lack of buffer effect on visible exchangeable proton resonances is evidence for the stringent requirement for nucleo-base protonation at pH values below neutrality, which is greatly reduced in the helical state. For this reason, sharp resonances are observed for both Watson-Crick and non-Watson-Crick cytosine amino protons for base-paired regions. Considerations of monomeric exchange mechanisms for the cytosine and guanine amino protons formed the basis for successful assignment and isolation of their resonances in the helical state by presaturation of the water resonance at selected pH values. Preirradiation of the water resonance at pH less than 6 would isolate the guanine amino 1H resonances of any self-complementary oligonucleotide, to exploit its high sensitivity as a useful proble of helix in equilibrium coil premelting.

References

Jan 1, 1978·Methods in Enzymology·A G Redfield
Nov 7, 1972·Biochemistry·B McConnell, P C Seawell
Jan 1, 1981·Annual Review of Biochemistry·B R Reid
May 7, 1982·Science·D J PatelK Itakura

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Citations

Mar 1, 1985·Proceedings of the National Academy of Sciences of the United States of America·P A Mirau, D R Kearns
Mar 11, 1987·Nucleic Acids Research·G V FazakerleyW Guschlbauer
May 11, 1990·Biochemistry·J D PuglisiI Tinoco
May 22, 1990·Biochemistry·M KochoyanM Guéron
Dec 1, 1988·European Journal of Biochemistry·F J Van de Ven, C W Hilbers
Aug 1, 1987·Quarterly Reviews of Biophysics·D J PatelD Hare
Dec 1, 1986·Journal of Biomolecular Structure & Dynamics·B McConnell
Oct 30, 2007·FEBS Letters·Elisabetta Viani Puglisi, Joseph D Puglisi

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