Abstract
Application of synthetic nucleoside analogues to capture newly transcribed RNAs has unveiled key features of RNA metabolism. Whether this approach could be adapted to isolate the RNA-bound proteome (RNA interactome) was, however, unexplored. We have developed a new method (capture of the newly transcribed RNA interactome using click chemistry, or RICK) for the systematic identification of RNA-binding proteins based on the incorporation of 5-ethynyluridine into newly transcribed RNAs followed by UV cross-linking and click chemistry-mediated biotinylation. The RNA–protein adducts are then isolated by affinity capture using streptavidin-coated beads. Through high-throughput RNA sequencing and mass spectrometry, the RNAs and proteins can be elucidated globally. A typical RICK experimental procedure takes only 1 d, excluding the steps of cell preparation, 5-ethynyluridine labeling, validation (silver staining, western blotting, quantitative reverse-transcription PCR (qRT-PCR) or RNA sequencing (RNA-seq)) and proteomics. Major advantages of RICK are the capture of RNA-binding proteins interacting with any type of RNA and, particularly, the ability to discern between newly transcribed and steady-state RNAs through controlled labeling. Thanks to its versatility, RICK will facilitate the characterization of the total and newly transcribed RNA interactome in different cell types and conditions.
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Data availability
RNA-seq data shown in this paper have been deposited in GEO under accession code GSE100756. Source data are provided with this paper. Source data files for other figures can be accessed via the supporting primary research article19.
Code availability
Code used to analyze the RNA-seq data can be accessed under accession code GSE100756 in GEO. Code used to process the MS data has been described in the Procedure steps, and more details are available from the corresponding author upon request.
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Acknowledgements
We thank all members of the Esteban lab for their support. This work was supported by the National Key Research and Development Program of China (2018YFA0106903, 2016YFA0100102 to M.A.E. and 2016YFA0100701 to X.B.), the Strategic Priority Research Program of the Chinese Academy of Sciences (XDA16030502 to M.A.E.), the Youth Innovation Promotion Association of the Chinese Academy of Sciences (Y201967 to X.B.), the Innovative Team Program of the Bioland Laboratory (Guangzhou Regenerative Medicine and Health Guangdong Laboratory) (2018GZR110103001 to M.A.E.), the National Natural Science Foundation of China (U20A2015, 92068106 to M.A.E. and 31900617 to X.G.), the Joint Research Project of Chinese Academy of Sciences and Japan Society for the Promotion of Science (GJHZ2093 to M.A.E.), the Natural Science Foundation of Guangdong Province (2018B030306042 to X.B.) and the Science and Technology Planning Project of Guangdong Province (2020B1212060052 to M.A.E.).
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X.B., X.G. and M.A.E. designed the original RICK experimental protocol; X.G., M.T., Y.L., S.K., Y.L. and X.W. performed all the experiments with help from N.L., M.J., J.M., M.Y., J.H. and J.Y; M.A.E. X.G. and X.B. wrote the manuscript with help from M.T., Y.L., S.K., Y.L. and X.W.; X.B. and M.A.E. approved the final version; Z.L., C.W., G.V., D.W., B.Q. and B.Z. provided advice and infrastructural support.
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Bao, X. et al. Nat. Methods 15, 213–220 (2018): https://doi.org/10.1038/nmeth.4595
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Guo, X., Tariq, M., Lai, Y. et al. Capture of the newly transcribed RNA interactome using click chemistry. Nat Protoc 16, 5193–5219 (2021). https://doi.org/10.1038/s41596-021-00609-y
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DOI: https://doi.org/10.1038/s41596-021-00609-y
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