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Nucleic Acids Research, 1983, Vol. 11, No. 9 2839-2856
© 1983

CHEMISTRY

Conformational analysis of a ribopentandeolde tetraphosphate in aqueous solution. A two-dimensional NMR study at 500 MHZ1

Peter P. Lankhorst, Gerry Wille, Jacques H.van Boom, Conelis Altona and Comdis A.G. Haasnoot

Gortaeus Laboratories, State University of Leiden P.O.Box 9502, 2300 RA Leiden, The Netherlands University of Nijmegen Toernooivekd, 6525 ED Nijmegen, The Netherlands

Received March 7, 1983. Accepted April 7, 1983.

The 30 ribose proton resonances of the pentaribonucleoside tetraphosphate m62AUm62AUm62A have been assigned unequivocally by means of spin-echo-correlated spectroscopy, 2D J-resolved spectroscopy and Nuclear Overhauser difference spectroscopy, carried out at 500 MHz. A detailed comparison of the conforma-tional properties of the title compound with its constituent fragments m62AUm62AUm62AUm62A, m62AU and the relevant monomers is given. Chemical shift data indicate the existence of a doubly "bulged out" con-former, in which the two interior U-fragments are not involved in regular nearest neighbour stacking interactions. The coupling constants of the ribose-ring are interpreted in terms of the N/S equilibrium, and population distributions along the backbone angles ß and are presented. The combined data suggest a strong similarity between the 5'-terminal triplets in m62AUm62AUm62A, m62-AUm62AU and m62AUm62A2


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