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Dual recruitment of Cdc48 (p97)-Ufd1-Npl4 ubiquitin-selective segregase by small ubiquitin-like modifier protein (SUMO) and ubiquitin in SUMO-targeted ubiquitin ligase-mediated genome stability functions.

J Biol Chem. 2012 Aug 24;287(35):29610-9. Epub 2012 Jun 22
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摘要


Protein modification by SUMO and ubiquitin critically impacts genome stability via effectors that "read" their signals using SUMO interaction motifs or ubiquitin binding domains, respectively. A novel mixed SUMO and ubiquitin signal is generated by the SUMO-targeted ubiquitin ligase (STUbL), which ubiquitylates SUMO conjugates. Herein, we determine that the "ubiquitin-selective" segregase Cdc48-Ufd1-Npl4 also binds SUMO via a SUMO interaction motif in Ufd1 and can thus act as a selective receptor for STUbL targets. Indeed, we define key cooperative DNA repair functions for Cdc48-Ufd1-Npl4 and STUbL, thereby revealing a new signaling mechanism involving dual recruitment by SUMO and ubiquitin for Cdc48-Ufd1-Npl4 functions in maintaining genome stability.

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