Abstract
Here we report an unbiased analysis of the cytotoxic T lymphocyte (CTL) serine-threonine phosphoproteome by high-resolution mass spectrometry. We identified approximately 2,000 phosphorylations in CTLs, of which approximately 450 were controlled by T cell antigen receptor (TCR) signaling. A significantly overrepresented group of molecules identified included transcription activators, corepressors and chromatin regulators. A focus on chromatin regulators showed that CTLs had high expression of the histone deacetylase HDAC7 but continually phosphorylated and exported this transcriptional repressor from the nucleus. Dephosphorylation of HDAC7 resulted in its accumulation in the nucleus and suppressed expression of genes encoding key cytokines, cytokine receptors and adhesion molecules that determine CTL function. Screening of the CTL phosphoproteome has thus identified intrinsic pathways of serine-threonine phosphorylation that target chromatin regulators and determine the CTL functional program.
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Acknowledgements
We thank members of the Biological Services Unit, R. Clarke of the Flow Cytometry Facility and members of the Cantrell laboratory for critical reading of the manuscript; and the Finnish DNA Microarray Centre at the Centre for Biotechnology (Turku, Finland) and N. Schurch for microarray analysis. Supported by the Wellcome Trust (065975/Z/01/A) and the Medical Research Council (J.G.).
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M.N.N., J.G. and C.F.-C. did the experiments and analyzed the results; N.M. supervised SILAC methodology and bioinformatic analysis; and M.N.N. and D.A.C. designed the experiments, analyzed the results and wrote the paper.
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Navarro, M., Goebel, J., Feijoo-Carnero, C. et al. Phosphoproteomic analysis reveals an intrinsic pathway for the regulation of histone deacetylase 7 that controls the function of cytotoxic T lymphocytes. Nat Immunol 12, 352–361 (2011). https://doi.org/10.1038/ni.2008
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DOI: https://doi.org/10.1038/ni.2008
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