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Specificity and Commonality of the Phosphoinositide-Binding Proteome Analyzed by Quantitative Mass Spectrometry

MPG-Autoren
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Nguyen,  Steve
Mann, Matthias / Proteomics and Signal Transduction, 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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Zitation

Jungmichel, S., Sylvestersen, K. B., Choudhary, C., Nguyen, S., Mann, M., & Nielsen, M. L. (2014). Specificity and Commonality of the Phosphoinositide-Binding Proteome Analyzed by Quantitative Mass Spectrometry. CELL REPORTS, 6(3), 578-591. doi:10.1016/j.celrep.2013.12.038.


Zitierlink: http://hdl.handle.net/11858/00-001M-0000-0017-E5AA-6
Zusammenfassung
Phosphoinositides (PIPs) play key roles in signaling and disease. Using high-resolution quantitative mass spectrometry, we identified PIP-interacting proteins and profiled their binding specificities toward all seven PIP variants. This analysis revealed 405 PIP-binding proteins, which is greater than the total number of phospho-or ubiquitin-binding domains. Translocation and inhibitor assays of identified PIP-binding proteins confirmed that ourmethodology targets direct interactors. The PIP interactome encompasses proteins from diverse cellular compartments, prominently including the nucleus. Our data set revealed a consensus motif for PI(3,4,5) P3interacting pleckstrin homology (PH) domains, which enabled in silico identification of phosphoinositide interactors. Members of the dedicator of cytokinesis family C exhibited specificity toward both PI(3,4,5) P3 and PI(4,5) P2. Structurally, this dual specificity is explained by a decreased number of positively charged residues in the L1 subdomain compared with DOCK1. The presented PIP-binding proteome and its specificity toward individual PIPs should be a valuable resource for the community.