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2D-HELS MS Seq: A General LC-MS-Based Method for Direct and de novo Sequencing of RNA Mixtures with Different Nucleotide Modifications
Published on: July 10, 2020
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Using spectral matching to interpret LC-MS/MS data during RNA modification mapping.
Mellie June Paulines1, Collin Wetzel1,2, Patrick A Limbach1
1Rieveschl Laboratories for Mass Spectrometry, Department of Chemistry, University of Cincinnati, PO Box 210172, Cincinnati, Ohio, 45221-0172, USA.
Journal of Mass Spectrometry : JMS
|October 31, 2019
Summary
Spectral matching enhances analysis of modified oligonucleotides, enabling efficient identification of RNA modifications like threonylcarbamoyladenosine (t⁶A) in transfer RNAs (tRNAs). This method streamlines data interpretation for modified nucleic acid research.
Area of Science:
- Biochemistry
- Analytical Chemistry
- Molecular Biology
Background:
- Analyzing modified oligonucleotides using liquid chromatography tandem mass spectrometry (LC-MS/MS) often requires de novo sequencing of each spectrum.
- Spectral matching offers an alternative by comparing experimental data against a library of annotated spectra.
- Existing spectral matching software requires adaptation for complex biological molecules like modified oligonucleotides.
Purpose of the Study:
- To adapt NIST spectral matching software for analyzing LC-MS/MS data from modified oligonucleotides.
- To demonstrate the utility of this adapted spectral matching approach for identifying post-transcriptionally modified nucleosides in transfer RNAs (tRNAs).
- To apply spectral matching for rapid screening of modified tRNAs in mutant strains for enzyme identification.
Main Methods:
- Adaptation of existing NIST spectral matching software for modified oligonucleotide MS/MS data.
- Utilizing experimental LC-MS/MS data as a library and annotated RNase T1 digestion products of tRNAs as reference spectra.
- Application of spectral matching to screen mutant strains of Streptococcus mutans for tRNA modification enzymes.
Main Results:
- The adapted spectral matching approach efficiently identified specific post-transcriptionally modified nucleosides in tRNAs.
- Spectral matching proved effective for screening known modified tRNAs.
- The method facilitated rapid analysis of multiple LC-MS/MS datasets, aiding in the identification of enzymes responsible for the tRNA modification threonylcarbamoyladenosine (t⁶A).
Conclusions:
- Adapted spectral matching is an efficient tool for interpreting LC-MS/MS data from modified oligonucleotides.
- This approach significantly accelerates the identification of RNA modifications and the screening of modified tRNAs.
- The study highlights the potential of spectral matching in discovering enzymes involved in tRNA modification pathways.
