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Nucleic Acids Research, 1980, Vol. 8, No. 21 5095-5111
© 1980

CHEMISTRY

The electrostatic molecular potential of tRNAPhe. IV. The potentials and steric accessibilities of sites associated with the bases

Richard Lavery, Alberte Pullman, Bernard Pullman and Marçal de Oliveira

Institut de Biologie Physico-Chimique, Laboratoire de Chimie Théorique associé au C.N.R.S., 13, rue Pierre et Marie Curie, 75005 Paris, France

Received August 13, 1980. The sites of the 76 nucleic acid bases of tRNAPhe potentially reactive towards electrophiles are studied by calculations on the associated molecular electrostatic potentials and the static steric accessibilities. Each of these sites is treated in its environment within the macromolecule. The influence of various schemes of screening by countercations of the backbone phosphates on the electrostatic potentials is investigated. The possible significance of the potentials and accessibilities in connection with observed chemical reactivities is discussed.


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