The binding of OTULIN restrains LUBAC activity to prevent TNF-driven immunopathology.

Disruption of OTULIN-LUBAC interaction in mice increases Met1-Ub accumulation at TNF receptor complexes, enhancing NF-κB signaling and sensitivity to TNF-induced toxicity.

• Why it matters: Understanding how OTULIN regulates LUBAC activity is crucial because it influences inflammatory responses and cell death, with implications for autoinflammatory diseases and infection outcomes.
• What they did: Researchers introduced a point mutation (Y56A) in OTULIN that impairs its binding to LUBAC, then examined the effects on mice, infection response, and ubiquitination processes.
• The result: The mutation did not cause spontaneous pathology but heightened susceptibility to TNF toxicity and immunopathology during infection, revealing the OTULIN-LUBAC interaction as a key regulator of inflammatory signaling.