title: TAK1 lysine 158 is required for TGF-β-induced TRAF6-mediated Smad-independent IKK/NF-κB and JNK/AP-1 activation.
abstract: Lys63-linked TAK1 polyubiquitination plays an essential role in the regulation of TAK1 activation. TRAF6-mediated Lys63-linked polyubiquitylation of TAK1 has been shown to be required for TGF-β-induced TAK1 activation. However, it remains unclear which lysine residue on TAK1 is TRAF6-mediated TAK1 polyubiquitination acceptor site in TGF-β signaling pathway. Here we report that lysine 158 on TAK1 is required for TGF-β-induced TRAF6-mediated TAK1 polyubiquitination and TAK1-mediated IKK, JNK and p38 activation. Notably, in contrast to TAK1 wild-type and K34R mutant, TAK1 K158R mutant co-overexpression with TAB1 failed to induce Lys63-linked TAK1 polyubiquitination. TRAF6-induced K63-linked TAK1 polyubiquitination was blocked by TAK1 K158R mutation, but not by K34R mutation. Furthermore, TGF-β-induced TAK1 polyubiquitination was inhibited by TAK1 K158R mutation, but not by K34R mutation in HeLa cells. Reconstitution of TAK1-deficient mouse embryo fibroblast cells with TAK1 wild-type, K158R mutant, or K34R mutant reveals that TAK1 lysine 158 residue is required for TGF-β-induced IKK, p38 and JNK activation.
authors.affiliation: Department of Pathology, Dan L. Duncan Cancer Center, Baylor College of Medicine, Houston, TX 77030, USA.
authors.forename: Renfang
authors.initials: R
authors.lastname: Mao
authors.forename: Yihui
authors.initials: Y
authors.lastname: Fan
authors.forename: Yonggao
authors.initials: Y
authors.lastname: Mou
authors.forename: Hong
authors.initials: H
authors.lastname: Zhang
authors.forename: Songbin
authors.initials: S
authors.lastname: Fu
authors.forename: Jianhua
authors.initials: J
authors.lastname: Yang
mesh_terms: D000818:Animals; D005347:Fibroblasts / Q000378:metabolism; D006367:HeLa Cells; D006801:Humans; D051550:I-kappa B Kinase / Q000378:metabolism*; D048031:JNK Mitogen-Activated Protein Kinases / Q000378:metabolism*; D008239:Lysine / Q000378:metabolism; D020930:MAP Kinase Kinase Kinases / Q000737:chemistry / Q000235:genetics / Q000378:metabolism*; D051379:Mice; D009154:Mutation; D016328:NF-kappa B / Q000378:metabolism*; D015398:Signal Transduction; D051785:Smad Proteins / Q000378:metabolism*; D048029:TNF Receptor-Associated Factor 6 / Q000378:metabolism*; D018808:Transcription Factor AP-1 / Q000378:metabolism*; D016212:Transforming Growth Factor beta / Q000494:pharmacology*; D054875:Ubiquitination; D048051:p38 Mitogen-Activated Protein Kinases / Q000378:metabolism; D000099151:MAP Kinase Kinase Kinase 7
chemical_list: D051550:I-kappa B Kinase; D048031:JNK Mitogen-Activated Protein Kinases; D008239:Lysine; D020930:MAP Kinase Kinase Kinases; D016328:NF-kappa B; D051785:Smad Proteins; D048029:TNF Receptor-Associated Factor 6; D018808:Transcription Factor AP-1; D016212:Transforming Growth Factor beta; D048051:p38 Mitogen-Activated Protein Kinases; D000099151:MAP Kinase Kinase Kinase 7