Medizinische Universität Graz - Research portal
Selected Publication:
SHR Neuro Cancer Cardio Lipid Metab Microb
Gomez-Diaz, C; Jonsson, G; Schodl, K; Deszcz, L; Bestehorn, A; Eislmayr, K; Almagro, J; Kavirayani, A; Seida, M; Fennell, LM; Hagelkruys, A; Kovarik, P; Penninger, JM; Ikeda, F.
The ubiquitin ligase HOIL-1L regulates immune responses by interacting with linear ubiquitin chains.
iScience. 2021; 24(11): 103241
Doi: 10.1016/j.isci.2021.103241
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- Co-authors Med Uni Graz
- Jonsson Gustav
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- Abstract:
- The Linear Ubiquitin Chain Assembly Complex (LUBAC), composed of HOIP, HOIL-1L, and SHARPIN, promotes tumor necrosis factor (TNF)-dependent NF-κB signaling in diverse cell types. HOIL-1L contains an Npl4 Zinc Finger (NZF) domain that specifically recognizes linear ubiquitin chains, but its physiological role in vivo has remained unclear. Here, we demonstrate that the HOIL-1L NZF domain has important regulatory functions in inflammation and immune responses in mice. We generated knockin mice (Hoil-1l T201A;R208A/T201A;R208A ) expressing a HOIL-1L NZF mutant and observed attenuated responses to TNF- and LPS-induced shock, including prolonged survival, stabilized body temperature, reduced cytokine production, and liver damage markers. Cells derived from Hoil-1l T201A;R208A/T201A;R208A mice show reduced TNF-dependent NF-κB activation and incomplete recruitment of HOIL-1L into TNF Receptor (TNFR) Complex I. We further show that HOIL-1L NZF cooperates with SHARPIN to prevent TNFR-dependent skin inflammation. Collectively, our data suggest that linear ubiquitin-chain binding by HOIL-1L regulates immune responses and inflammation in vivo.