Abstract
Probes that form covalent bonds with RNA molecules on the basis of their chemical reactivity would advance our ability to study the transcriptome. We developed a set of electrophilic activity-based RNA probes designed to react with unusually nucleophilic RNAs. We used these probes to identify reactive genome-encoded RNAs, resulting in the discovery of a 42-nt catalytic RNA from an archaebacterium that reacts with a 2,3-disubstituted epoxide at N7 of a specific guanosine. Detailed characterization of the catalytic RNA revealed the structural requirements for reactivity. We developed this catalytic RNA into a general tool to selectively conjugate a small molecule to an RNA of interest. This strategy enabled up to 500-fold enrichment of target RNA from total mammalian RNA or from cell lysate. We demonstrated the utility of this approach by selectively capturing proteins in yeast cell lysate that bind the ASH1 mRNA.
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Acknowledgements
This work was supported by US National Institutes of Health (NIH)/ National Institute of General Medical Sciences R01 GM065865 and the Howard Hughes Medical Institute. R.I.M. and S.M. were supported by a NIH National Research Service Award Postdoctoral Fellowship (F32GM099359 and F32GM101751). We thank L. Goff for assistance with bioinformatics analysis, D. Engelke (University of Michigan, Ann Arbor) for providing the 5S rRNA plasmid and E. Weerapana (Boston College) for providing the fluorophosphonate probe. We are also grateful to C. Dumelin, A. Leconte, L. McGregor, D. Thompson and D. Usanov for helpful discussions.
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R.I.M. designed the research, prepared materials and performed experiments. J.P.G. and S.M. prepared materials and performed research. E.A.C. and W.I.L. prepared materials. D.R.L. designed and supervised the research. R.I.M. and D.R.L. wrote the manuscript.
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McDonald, R., Guilinger, J., Mukherji, S. et al. Electrophilic activity-based RNA probes reveal a self-alkylating RNA for RNA labeling. Nat Chem Biol 10, 1049–1054 (2014). https://doi.org/10.1038/nchembio.1655
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DOI: https://doi.org/10.1038/nchembio.1655
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