PMID: 6166006Apr 1, 1981Paper

Chemical probing of the tRNA--ribosome complex

Proceedings of the National Academy of Sciences of the United States of America
D A Peattie, W Herr

Abstract

We probed the (Escherichia coli) tRNAPhe--ribosome interaction with the chemical reagents dimethyl sulfate and diethyl pyrocarbonate. This monitored the higher-order structure of the tRNA in this biological complex and identified critical sites in the tRNA molecule involved in binding to the ribosome. The methylation of the N-7 position of guanosine and the N-3 position of cytidine as well as diethyl pyrocarbonate attack on adenosines are sensitive to secondary and tertiary interactions. Here we identify specific bases in E. coli Phe-tRNAPhe affected by the interaction with the ribosome. The 70S ribosome protects the N-3 position of cytidine-74 and 75 in the 3'-terminal C-C-A, suggesting a strong, possibly base pairing, interaction between the ribosome and that universal sequence. The ribosome also induces strong reactivities at the N-7 positions of G-24 and G-46 in the central region of the tRNA molecule near the variable-loop domain as well as less significant reactivities at 11 other guanosines. Two of these, G-10 and G-44, are close to G-24 and G-46 in the center of the molecule; the others (guanosines 1, 5, 6, 18, 19, 63, 65, 69, and 71) are in the coaxial acceptor stem-T stem helix. All of the effects are ribosome induced...Continue Reading

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Citations

Dec 10, 1998·Biopolymers·S A Strobel
Dec 1, 1984·Molecular Biology Reports·C Cunningham, M C Ganoza
Jan 1, 1986·Progress in Biophysics and Molecular Biology·K Nagano, M Harel
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