SPATA2 promotes CYLD activity and regulates TNF‐induced NF‐κB signaling and cell death |
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| Authors: | Lisa Schlicher Celia Jakob Veronica Dumit Christoph Borner Joern Dengjel Ulrich Maurer |
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| Affiliation: | 1. Institute of Molecular Medicine and Cell Research, Albert‐Ludwigs‐University Freiburg, Freiburg, Germany;2. Spemann Graduate School of Biology and Medicine (SGBM), Albert‐Ludwigs‐University of Freiburg, Freiburg, Germany;3. BIOSS, Centre for Biological Signaling Studies, Freiburg, Germany;4. Core Facility Proteomics, Center for Biological Systems Analysis, Freiburg, Germany |
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| Abstract: | K63‐ and Met1‐linked ubiquitylation are crucial posttranslational modifications for TNF receptor signaling. These non‐degradative ubiquitylations are counteracted by deubiquitinases (DUBs), such as the enzyme CYLD, resulting in an appropriate signal strength, but the regulation of this process remains incompletely understood. Here, we describe an interaction partner of CYLD, SPATA2, which we identified by a mass spectrometry screen. We find that SPATA2 interacts via its PUB domain with CYLD, while a PUB interaction motif (PIM) of SPATA2 interacts with the PUB domain of the LUBAC component HOIP. SPATA2 is required for the recruitment of CYLD to the TNF receptor signaling complex upon TNFR stimulation. Moreover, SPATA2 acts as an allosteric activator for the K63‐ and M1‐deubiquitinase activity of CYLD. In consequence, SPATA2 substantially attenuates TNF‐induced NF‐κB and MAPK signaling. Conversely, SPATA2 is required for TNF‐induced complex II formation, caspase activation, and apoptosis. Thus, this study identifies SPATA2 as an important factor in the TNF signaling pathway with a substantial role for the effects mediated by the cytokine. |
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| Keywords: | apoptosis CYLD HOIP SPATA2 TNF |
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