Abstract
A method to investigate the structure of RNA molecules within intact plant tissues has been developed. The RNA structures are analyzed using dimethyl sulfate (DMS), which modifies substituents of adenine and cytosine residues within single-stranded regions of RNA molecules. Reactive sites are identified by primer extension analysis. Using this procedure, an analysis of the secondary structure of the cytoplasmic 18S ribosomal RNA in soybean seedling leaves has been completed. DMS modification data are in good agreement with the phylogenetic structure predicted for soybean 18S rRNA. However, there are a few notable exceptions where residues thought to be involved in double-stranded regions in all 18S rRNAs are strongly modified in soybean leaf samples. These data taken together with the phylogenetic structure suggest that alternate structures may exist in vivo.
The further applicability of this technique is demonstrated by comparing the modification pattern obtained in vivo to that obtained in vitro for a particular mRNA molecule encoding the small subunit of ribulose-1,5-bisphosphate carboxylase. The results obtained are compared to a predicted minimum energy secondary structure. The data indicate that the conformation of RNA molecules within the cell may not be reflected in a structural analysis of purified mRNA molecules.
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Senecoff, J.F., Meagher, R.B. In vivo analysis of plant RNA structure: soybean 18S ribosomal and ribulose-1,5-bisphosphate carboxylase small subunit RNAs. Plant Mol Biol 18, 219–234 (1992). https://doi.org/10.1007/BF00034951
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DOI: https://doi.org/10.1007/BF00034951