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Identification of covalent modifications regulating immune signaling complex composition and phenotype

MPG-Autoren
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Frauenstein,  Annika
Meissner, Felix / Experimental Systems Immunology, Max Planck Institute of Biochemistry, Max Planck Society;

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Ebner,  Stefan
Meissner, Felix / Experimental Systems Immunology, Max Planck Institute of Biochemistry, Max Planck Society;

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Hansen,  Fynn M.
Mann, Matthias / Proteomics and Signal Transduction, Max Planck Institute of Biochemistry, Max Planck Society;

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Sinha,  Ankit
Mann, Matthias / Proteomics and Signal Transduction, Max Planck Institute of Biochemistry, Max Planck Society;

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Phulphagar,  Kshiti
Meissner, Felix / Experimental Systems Immunology, Max Planck Institute of Biochemistry, Max Planck Society;

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Swatek,  Kirby
Schulman, Brenda / Molecular Machines and Signaling, Max Planck Institute of Biochemistry, Max Planck Society;

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Mann,  Matthias
Mann, Matthias / Proteomics and Signal Transduction, Max Planck Institute of Biochemistry, Max Planck Society;

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Meissner,  Felix
Meissner, Felix / Experimental Systems Immunology, Max Planck Institute of Biochemistry, Max Planck Society;

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Zitation

Frauenstein, A., Ebner, S., Hansen, F. M., Sinha, A., Phulphagar, K., Swatek, K., et al. (2021). Identification of covalent modifications regulating immune signaling complex composition and phenotype. Molecular Systems Biology, 17(7): e10125. doi:10.15252/msb.202010125.


Zitierlink: https://hdl.handle.net/21.11116/0000-0009-02D4-5
Zusammenfassung
Cells signal through rearrangements of protein communities governed by covalent modifications and reversible interactions of distinct sets of proteins. A method that identifies those post-transcriptional modifications regulating signaling complex composition and functional phenotypes in one experimental setup would facilitate an efficient identification of novel molecular signaling checkpoints. Here, we devised modifications, interactions and phenotypes by affinity purification mass spectrometry (MIP-APMS), comprising the streamlined cloning and transduction of tagged proteins into functionalized reporter cells as well as affinity chromatography, followed by MS-based quantification. We report the time-resolved interplay of more than 50 previously undescribed modification and hundreds of protein-protein interactions of 19 immune protein complexes in monocytes. Validation of interdependencies between covalent, reversible, and functional protein complex regulations by knockout or site-specific mutation revealed ISGylation and phosphorylation of TRAF2 as well as ARHGEF18 interaction in Toll-like receptor 2 signaling. Moreover, we identify distinct mechanisms of action for small molecule inhibitors of p38 (MAPK14). Our method provides a fast and cost-effective pipeline for the molecular interrogation of protein communities in diverse biological systems and primary cells.