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. 1988 Mar 25;16(5 Pt B):1931–1950. doi: 10.1093/nar/16.5.1931

Temperature dependent chemical and enzymatic probing of the tRNA-like structure of TYMV RNA.

A van Belkum 1, P Verlaan 1, J B Kun 1, C Pleij 1, L Bosch 1
PMCID: PMC338191  PMID: 2833723

Abstract

In this paper we report on the thermal unfolding of the tRNA-like structure present at the 3' end of turnip yellow mosaic virus (TYMV) RNA. Diethyl pyrocarbonate (DEP), sodium bisulphite, nuclease S1 and ribonuclease T1 were used as structure probes at a broad range of temperatures. In this way most of the nucleotides present in the tRNA-like moiety were analysed. The melting behaviour of both secondary and tertiary interactions could be followed on the basis of the temperature dependent accessibility of the individual nucleotides or bases towards the various probes. The three-dimensional model of the tRNA-like domain (Dumas et al., J. Biomol. Struct. and Dyn. 4, 707 (1987] was supported by the results to a large extent. The interactions occurring between the T- and D-loop appear to be more complex than proposed in the latter model. Additional evidence for the presence of the RNA pseudoknot (Rietveld et al., Nucleic Acids Res. 10, 1929 (1982] was derived from the fact that the three coaxially stacked helical segments in the aminoacylacceptor arm displayed different melting transitions under certain experimental conditions. Aspects of melting behaviour and thermal stability of double helical regions within the tRNA-like structure are discussed, as well as the applicability of nucleases and modifying reagents at various temperatures in the analysis of RNA structure.

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