By David G. Gorenstein (auth.), Bernard Pullman (eds.)
Read Online or Download Nuclear Magnetic Resonance Spectroscopy in Molecular Biology: Proceedings of the Eleventh Jerusalem Symposium on Quantum Chemistry and Biochemistry Held in Jerusalem, Israël, April 3–7, 1978 PDF
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Additional resources for Nuclear Magnetic Resonance Spectroscopy in Molecular Biology: Proceedings of the Eleventh Jerusalem Symposium on Quantum Chemistry and Biochemistry Held in Jerusalem, Israël, April 3–7, 1978
However, the large areas of 1-3 kcal/mole (enveloping X in the anti and syn domains) associated with the global and local minima indicate rather greater degree of flexibility about the glycosidic torsion. Such larger domains for X have been predicted for guanine derivatives by PCILO method (Berthod and Pullman, 1971ab). The isoenergy curves for 7-Me-5'GMP with 2E sugar geometry is shown 33 34 M. M. DHINGRA AND R. H. 0073 *Fram Renugopalakrishnan and A. V. ~. £::: :> 'i-:::==== +180 ~=::=:::::::::==~""2--""""""£C I~ A = - 05 120 • = ob=~~~~~~~~~ 36O~-- ______ 4 ____~===------- c:; ___ ~ c=5~ 24 B 120 60 120 XCN Fig.
Table I compares the activation energies for the unmodified purine(~) ribosides with some recently obtained results tor nucleoside analogs (20). The data found are remarkably independent on modifications at the base and the ribose moiety. 8 (compare table II) and one would expect an increased rigidity of the furanose ring, which is not found in the experiments. The removal of the Table I: Activation Energies for the N , S Pseudorotation of some Purine(~)ribosides and Analogs in Liquid Deuteroammonia ref.
P. (1974), Cell 1, 197 Sarma, R. , Lee, C. , Evans, F. , and Sundaralingam, M. (1974), J. Am. Chem. Soc. 96, 7337. , and Perahia, D. (1973), Biochem. Biophys. Acta 299, 497. , and Perahia, D. (1972), Biochem. Biophys. Acta 287, 211. , Bugg, C. , and Marsh, R. , (1970), Acta. Cryst. B26. 1089. , (1973a) Biopolymers 12, 297. , (1973b) Biopolymers 12, 2075. A. INTRODUCTION The purinenucleosides and their natural or synthetic analogs are a class of compounds with a broad spectrum of physiological effects.