SHARPIN forms a linear ubiquitin ligase complex regulating NF-κB activity and apoptosis

Fumiyo Ikeda, Yonathan Lissanu Deribe, Sigrid S. Skånland, Benjamin Stieglitz, Caroline Grabbe, Mirita Franz-Wachtel, Sjoerd J.L. Van Wijk, Panchali Goswami, Vanja Nagy, Janos Terzic, Fuminori Tokunaga, Ariadne Androulidaki, Tomoko Nakagawa, Manolis Pasparakis, Kazuhiro Iwai, John P. Sundberg, Liliana Schaefer, Katrin Rittinger, Boris MacEk, Ivan Dikic

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Abstract

SHARPIN is a ubiquitin-binding and ubiquitin-like-domain-containing protein which, when mutated in mice, results in immune system disorders and multi-organ inflammation. Here we report that SHARPIN functions as a novel component of the linear ubiquitin chain assembly complex (LUBAC) and that the absence of SHARPIN causes dysregulation of NF-κB and apoptotic signalling pathways, explaining the severe phenotypes displayed by chronic proliferative dermatitis (cpdm) in SHARPIN-deficient mice. Upon binding to the LUBAC subunit HOIP (also known as RNF31), SHARPIN stimulates the formation of linear ubiquitin chains in vitro and in vivo. Coexpression of SHARPIN and HOIP promotes linear ubiquitination of NEMO (also known as IKBKG), an adaptor of the Iβ°B kinases (IKKs) and subsequent activation of NF-β°B signalling, whereas SHARPIN deficiency in mice causes an impaired activation of the IKK complex and NF-κB in B cells, macrophages and mouse embryonic fibroblasts (MEFs). This effect is further enhanced upon concurrent downregulation of HOIL-1L (also known as RBCK1), another HOIP-binding component of LUBAC. In addition, SHARPIN deficiency leads to rapid cell death upon tumour-necrosis factor α (TNF-α) stimulation via FADD- and caspase-8-dependent pathways. SHARPIN thus activates NF-κB and inhibits apoptosis via distinct pathways in vivo.

Original languageEnglish
Pages (from-to)637-641
Number of pages5
JournalNature
Volume471
Issue number7340
DOIs
Publication statusPublished - Mar 31 2011
Externally publishedYes

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Ikeda, F., Deribe, Y. L., Skånland, S. S., Stieglitz, B., Grabbe, C., Franz-Wachtel, M., ... Dikic, I. (2011). SHARPIN forms a linear ubiquitin ligase complex regulating NF-κB activity and apoptosis. Nature, 471(7340), 637-641. https://doi.org/10.1038/nature09814