title: Recruitment of the linear ubiquitin chain assembly complex stabilizes the TNF-R1 signaling complex and is required for TNF-mediated gene induction.
abstract: TNF is a key inflammatory cytokine. Using a modified tandem affinity purification approach, we identified HOIL-1 and HOIP as functional components of the native TNF-R1 signaling complex (TNF-RSC). Together, they were shown to form a linear ubiquitin chain assembly complex (LUBAC) and to ubiquitylate NEMO. We show that LUBAC binds to ubiquitin chains of different linkage types and that its recruitment to the TNF-RSC is impaired in TRADD-, TRAF2-, and cIAP1/2- but not in RIP1- or NEMO-deficient MEFs. Furthermore, the E3 ligase activity of cIAPs, but not TRAF2, is required for HOIL-1 recruitment to the TNF-RSC. LUBAC enhances NEMO interaction with the TNF-RSC, stabilizes this protein complex, and is required for efficient TNF-induced activation of NF-kappaB and JNK, resulting in apoptosis inhibition. Finally, we demonstrate that sustained stability of the TNF-RSC requires LUBAC's enzymatic activity, thereby adding a third form of ubiquitin linkage to the triggering of TNF signaling by the TNF-RSC.
authors.affiliation: Division of Apoptosis Regulation, German Cancer Research Center (DKFZ), 69120 Heidelberg, Germany.
authors.forename: Tobias L
authors.initials: TL
authors.lastname: Haas
authors.forename: Christoph H
authors.initials: CH
authors.lastname: Emmerich
authors.forename: Björn
authors.initials: B
authors.lastname: Gerlach
authors.forename: Anna C
authors.initials: AC
authors.lastname: Schmukle
authors.forename: Stefanie M
authors.initials: SM
authors.lastname: Cordier
authors.forename: Eva
authors.initials: E
authors.lastname: Rieser
authors.forename: Rebecca
authors.initials: R
authors.lastname: Feltham
authors.forename: James
authors.initials: J
authors.lastname: Vince
authors.forename: Uwe
authors.initials: U
authors.lastname: Warnken
authors.forename: Till
authors.initials: T
authors.lastname: Wenger
authors.forename: Ronald
authors.initials: R
authors.lastname: Koschny
authors.forename: David
authors.initials: D
authors.lastname: Komander
authors.forename: John
authors.initials: J
authors.lastname: Silke
authors.forename: Henning
authors.initials: H
authors.lastname: Walczak
mesh_terms: D000818:Animals; D017209:Apoptosis; D002460:Cell Line; D020690:GTPase-Activating Proteins / Q000235:genetics; D005786:Gene Expression Regulation; D006367:HeLa Cells; D006801:Humans; D051034:Inhibitor of Apoptosis Proteins / Q000235:genetics / Q000502:physiology; D047908:Intracellular Signaling Peptides and Proteins / Q000235:genetics; D048031:JNK Mitogen-Activated Protein Kinases / Q000378:metabolism; D051379:Mice; D016328:NF-kappa B / Q000378:metabolism; D047888:Receptors, Tumor Necrosis Factor, Type I / Q000378:metabolism*; D015398:Signal Transduction; D053199:TNF Receptor-Associated Death Domain Protein / Q000235:genetics; D047992:TNF Receptor-Associated Factor 2 / Q000235:genetics / Q000502:physiology; D014409:Tumor Necrosis Factor-alpha / Q000502:physiology*; D020298:U937 Cells; D025801:Ubiquitin / Q000378:metabolism*; D044767:Ubiquitin-Protein Ligases / Q000235:genetics / Q000502:physiology
chemical_list: D020690:GTPase-Activating Proteins; D051034:Inhibitor of Apoptosis Proteins; D047908:Intracellular Signaling Peptides and Proteins; C514981:NEMO protein, mouse; D016328:NF-kappa B; C490620:Ralbp1 protein, mouse; D047888:Receptors, Tumor Necrosis Factor, Type I; D053199:TNF Receptor-Associated Death Domain Protein; D047992:TNF Receptor-Associated Factor 2; D014409:Tumor Necrosis Factor-alpha; D025801:Ubiquitin; D044767:Ubiquitin-Protein Ligases; D048031:JNK Mitogen-Activated Protein Kinases