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. 1993 Sep 25;21(19):4577–4585. doi: 10.1093/nar/21.19.4577

A novel method for the determination of post-transcriptional modification in RNA by mass spectrometry.

J A Kowalak 1, S C Pomerantz 1, P F Crain 1, J A McCloskey 1
PMCID: PMC311193  PMID: 8233793

Abstract

A method is described for the detection, chemical characterization and sequence placement of post-transcriptionally modified nucleotides in RNA. Molecular masses of oligonucleotides produced by RNase T1 hydrolysis can be measured by electrospray mass spectrometry with errors of less than 1 Da, which provides exact base composition, and recognition of modifications resulting from incremental increases in mass. Used in conjunction with combined liquid chromatography-mass spectrometry and gene sequence data, modified residues can be completely characterized at the nucleoside level, and assigned to sequence sites within oligonucleotides defined by selective RNase cleavage. The procedures are demonstrated using E.coli 5S rRNA, in which all RNase T1 fragments predicted from the rDNA sequence are identified solely on the basis of their molecular masses, and using E.coli 16S rRNA for analysis of post-transcriptional modification, including placement of 3-methyluridine at position 1498. The principles described are generally applicable to other covalent structural modifications of RNA which produce a change in mass, such as those resulting from editing, photochemical cross-linking, or xenobiotic modification.

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Selected References

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