Abstract
Proteins regulate gene expression by controlling mRNA biogenesis, localization, translation and decay. Identifying the composition, diversity and function of mRNA–protein complexes (mRNPs) is essential to understanding these processes. In a global survey of Saccharomyces cerevisiae mRNA-binding proteins, we identified 120 proteins that cross-link to mRNA, including 66 new mRNA-binding proteins. These include kinases, RNA-modification enzymes, metabolic enzymes and tRNA- and rRNA-metabolism factors. These proteins show dynamic subcellular localization during stress, including assembly into stress granules and processing bodies (P bodies). Cross-linking and immunoprecipitation (CLIP) analyses of the P-body components Pat1, Lsm1, Dhh1 and Sbp1 identified sites of interaction on specific mRNAs, revealing positional binding preferences and co-assembly preferences. When taken together, this work defines the major yeast mRNP proteins, reveals widespread changes in their subcellular location during stress and begins to define assembly rules for P-body mRNPs.
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Acknowledgements
MS and proteomics data were acquired by the Arizona Proteomics Consortium supported by the US National Institute of Environmental Health Science grant ES06694 (the S.W.E.H.S.C.), the US National Institutes of Health, US National Cancer Institute grant CA023074 (the A.Z.C.C.) and the BIO5 Institute of the University of Arizona. The Thermo Fisher LTQ Orbitrap Velos mass spectrometer was provided by the US National Institutes of Health, US National Center for Research Resources grant 1S10 RR028868-01 (G.T.). We thank J.R. Buchan for assistance with microscopy and C. Decker and other members of the Parker lab for helpful discussions. This work was supported by funding from the US National Institutes of Health grant 7R37 GM045443 (R.P.), a Howard Hughes Medical Institute grant (R.P.) and Leukemia and Lymphoma Society fellowship 5687-13 (S.F.M.).
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R.P., S.F.M., S.J. and M.S. designed the project. S.F.M. performed the in vivo RBP capture experiments and CLIP analysis, S.J. did the microscopy and CLIP analysis, and M.S. performed the CLIP experiments and analysis. R.P., S.F.M. and S.J. wrote the paper.
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Supplementary Text and Figures
Supplementary Figures 1–5, Supplementary Table 2, Supplementary note (PDF 378 kb)
Supplementary Table 1
A list of all 120 proteins identified as enriched by the in vivo capture of RBPs. (XLSX 48 kb)
Supplementary Table 3
A list of mRNAs (Tier1 and Tier2) bound by Dhh1, Lsm1, Pat1 and Sbp1. (XLSX 127 kb)
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Mitchell, S., Jain, S., She, M. et al. Global analysis of yeast mRNPs. Nat Struct Mol Biol 20, 127–133 (2013). https://doi.org/10.1038/nsmb.2468
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DOI: https://doi.org/10.1038/nsmb.2468
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