Abstract
Chemical labeling of RNA by using chemoselective reactions that work under biologically benign conditions is increasingly becoming valuable in the in vitro and in vivo analysis of RNA. Here, we describe a modular RNA labeling method based on a posttranscriptional Suzuki-Miyaura coupling reaction, which works under mild conditions and enables the direct installation of various biophysical reporters and tags. This two-part procedure involves the incorporation of a halogen-modified UTP analog (5-iodouridine-5′-triphosphate) by a transcription reaction. Subsequent posttranscriptional coupling with boronic acid/ester substrates in the presence of a palladium catalyst provides access to RNA labeled with (a) fluorogenic environment-sensitive nucleosides for probing nucleic acid structure and recognition, (b) fluorescent probes for microscopy, and (3) affinity tags for pull-down and immunoassays. It is expected that this method could also become useful for imaging nascent RNA transcripts in cells if the nucleotide analog can be metabolically incorporated and coupled with reporters by metal-assisted cross-coupling reactions.
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Acknowledgments
This work was supported by Wellcome Trust-DBT India Alliance (IA/S/16/1/502360) grant to S.G.S. M.B.W. thanks CSIR, India, for a graduate research fellowship. The authors wish to thank Arun Tanpure for discussion and help with work that has led to the optimization of this protocol.
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Walunj, M.B., Srivatsan, S.G. (2020). Posttranscriptional Suzuki-Miyaura Cross-Coupling Yields Labeled RNA for Conformational Analysis and Imaging. In: Heinlein, M. (eds) RNA Tagging. Methods in Molecular Biology, vol 2166. Humana, New York, NY. https://doi.org/10.1007/978-1-0716-0712-1_27
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DOI: https://doi.org/10.1007/978-1-0716-0712-1_27
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