title: Identification of a novel homotypic interaction motif required for the phosphorylation of receptor-interacting protein (RIP) by RIP3.
abstract: Receptor-interacting protein (RIP), a Ser/Thr kinase component of the tumor necrosis factor (TNF) receptor-1 signaling complex, mediates activation of the nuclear factor kappaB (NF-kappaB) pathway. RIP2 and RIP3 are related kinases that share extensive sequence homology with the kinase domain of RIP. Unlike RIP, which has a C-terminal death domain, and RIP2, which has a C-terminal caspase activation and recruitment domain, RIP3 possesses a unique C terminus. RIP3 binds RIP through this unique C-terminal segment to inhibit RIP- and TNF receptor-1-mediated NF-kappaB activation. We have identified a unique homotypic interaction motif at the C terminus of both RIP and RIP3 that is required for their association. Sixty-four amino acids within RIP3 and 88 residues within RIP are sufficient for interaction of the two proteins. This interaction is a prerequisite for RIP3-mediated phosphorylation of RIP and subsequent attenuation of TNF-induced NF-kappaB activation.
authors.affiliation: Department of Molecular Oncology, Genentech, Inc., South San Francisco, California 94080, USA.
authors.forename: Xiaoqing
authors.initials: X
authors.lastname: Sun
authors.forename: Jianping
authors.initials: J
authors.lastname: Yin
authors.forename: Melissa A
authors.initials: MA
authors.lastname: Starovasnik
authors.forename: Wayne J
authors.initials: WJ
authors.lastname: Fairbrother
authors.forename: Vishva M
authors.initials: VM
authors.lastname: Dixit
mesh_terms: D020816:Amino Acid Motifs; D015703:Antigens, CD / Q000378:metabolism; D006801:Humans; D019169:Jurkat Cells; D016328:NF-kappa B / Q000378:metabolism; D010766:Phosphorylation; D011494:Protein Kinases / Q000378:metabolism*; D011506:Proteins / Q000737:chemistry* / Q000378:metabolism; D053422:Receptor-Interacting Protein Serine-Threonine Kinases; D018124:Receptors, Tumor Necrosis Factor / Q000378:metabolism; D047888:Receptors, Tumor Necrosis Factor, Type I; D014409:Tumor Necrosis Factor-alpha / Q000037:antagonists & inhibitors; D020298:U937 Cells
chemical_list: D015703:Antigens, CD; D016328:NF-kappa B; D011506:Proteins; D018124:Receptors, Tumor Necrosis Factor; D047888:Receptors, Tumor Necrosis Factor, Type I; D014409:Tumor Necrosis Factor-alpha; D011494:Protein Kinases; C506249:RIPK1 protein, human; C119705:RIPK3 protein, human; D053422:Receptor-Interacting Protein Serine-Threonine Kinases