Summary
In analogy to the globular protein structures the predominant stabilization factor of which is surface energy a compact model with the smallest possible surface of the tertiary structure of t-RNA is suggested. The principle of folding is — according to the clover leaf model — the superposition of the three leaves. The three loops form a ring (loop-stack). The stem can be placed on this molecular body bringing the CCA end into the vicinity of the loop-stack, where the CCA end can be bound. The structures of the RNA chain are subordinated to this globular structural principle. Under the influence of the
sequence the CCA end is able to undergo structural changes, thus allowing to explain the role of t-RNA in the aminoacylation process and the structural differences between t-RNA, aminoacyl-t-RNA, and peptidyl-t-RNA. Furthermore it is possible to comment on the existence of the characteristic and modified bases, the role of magnesium ions and the chemical reactions of these compounds.
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I am particularly greatful to Dr. P. Fromageot, Dr. W. Guschlbauer (Saclay), Prof. Dr. R. Brunner, and Dr. M. Röhr (Vienna) for helpful discussions. Dr. J. Catlin helped me in the preparation of this paper. I was supported in this work by a Joliot-Curie fellowship.
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Melcher, G. Tertiary structure and function of transfer-RNA. Biophysik 9, 13–38 (1972). https://doi.org/10.1007/BF01293478
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DOI: https://doi.org/10.1007/BF01293478