NDLI: Interactions between natural polyamines and tRNA: an 15N NMR analysis.

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Interactions between natural polyamines and tRNA: an 15N NMR analysis.

Content Provider	World Health Organization (WHO)-Global Index Medicus
Author	Frydman, B. Frydman, L. Rossomando, P. C. Samejima, K. Frydman, V. Fernandez, C. O.
Description	Author Affiliation: Frydman L ( Facultad de Farmacia y Bioquimica, Universidad de Buenos Aires, Argentina.);
Abstract	15N NMR spectroscopy was used to explore the interactions between natural polyamines and Escherichia coli tRNA. It was found that when tRNA is added to solutions of 15N-labeled spermine or spermidine, there is a considerable decrease in the relative heights of the -NH(2+)--resonances with respect to the signals arising from the -NH3+ groups. The presence of tRNA was also found to reduce the longitudinal relaxation times T1 of the nitrogens, mainly those of the -NH(2+)- groups. The longitudinal relaxation times of the nitrogens were used to characterize the temperature dependence of the binding, and they allowed us to calculate the activation energies that determine the correlation times of amino groups in the presence of tRNA. Both the thermodynamic and the relaxation results indicate that (i) spermine binds more strongly to tRNA than spermidine does and (ii) within each of these molecules the -NH(2+)- groups bind more strongly to tRNA than the more electropositive -NH3+ moieties. This specificity suggests that the interaction between polyamines and tRNA cannot be described exclusively in terms of electrostatic forces and that other interactions (most likely, hydrogen bonding) are very important for establishing the polyamine-tRNA link. Some of the factors that may conspire against the binding of -NH3+ groups to tRNA are briefly discussed.
ISSN	00278424
e-ISSN	10916490
Journal	Proceedings of the National Academy of Sciences of the United States of America
Issue Number	19
Volume Number	89
Language	English
Publisher	National Academy of Sciences
Publisher Date	1992-11-01
Publisher Place	United States
Access Restriction	Open
Subject Keyword	Polyamines Chemistry RNA, Transfer Escherichia Coli Magnetic Resonance Spectroscopy Molecular Conformation Nitrogen Isotopes Putrescine Spermidine Spermine Research Support, Non-U.S. Gov't Research Support, U.S. Gov't, P.H.S. Multidisciplinary
Content Type	Text
Resource Type	Article
Subject	Multidisciplinary

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