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Updated: Jan 13, 2026

Activation and Measurement of NLRP3 Inflammasome Activity Using IL-1β in Human Monocyte-derived Dendritic Cells
Published on: May 22, 2014
UBE2O-mediated monoubiquitination licenses NLRP6 inflammasome activation in the intestine
Decai Wang1, Xuequn Chen1, Kaiwen Sui1
1State Key Laboratory of Immune Response and Immunotherapy, Center for Advanced Interdisciplinary Science and Biomedicine of IHM, Division of Life Sciences and Medicine, University of Science and Technology of China, Hefei 230026, China.
Abstract:
The NLRP6 inflammasome in intestinal epithelial cells (IECs) is a key sentinel of enteric pathogens, yet its activation mechanism remains enigmatic. Here, we identify monoubiquitination as a critical post-translational switch for NLRP6 inflammasome activation. We demonstrate that the E3 ligase UBE2O catalyzes dual-site monoubiquitination of NLRP6: at K680-687 to drive oligomerization via a conformational change, and at K115/130 within the nuclear localization signal to enforce cytoplasmic sequestration through steric hindrance. Mice harboring UBE2O deficiency or monoubiquitination-resistant NLRP6 mutations exhibit defective inflammasome activation and heightened susceptibility to rotavirus and Citrobacter rodentium infection. Furthermore, the UBE2O inhibitor arsenic trioxide suppresses NLRP6-dependent interleukin (IL)-18 secretion in acute promyelocytic leukemia (APL) patients. Thus, UBE2O-mediated dual-site monoubiquitination emerges as a central mechanism licensing NLRP6 inflammasome activation, revealing a new target for modulating intestinal immunity.
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