title: Ubiquitin and NEDD8: brothers in arms.
abstract: Ubiquitin (Ub) and ubiquitin-like (Ubl) proteins are small signaling molecules that are involved in many aspects of cell function. It has been assumed that Ub and Ubl have functionally distinct roles because they use different conjugation machineries and bind to different effector proteins. This paradigm, however, must be revisited after recent findings that signaling cascades mediated by Ub and the Ubl NEDD8 (Neural precursor cell-Expressed Developmentally Down-regulated 8) in the regulation of epidermal growth factor receptor (EGFR) endocytosis are redundant. In this context, Ub and NEDD8 share the same E3 ligase, Cbl, and are recognized by identical components of the endocytic sorting machinery. This unexpected redundancy introduces additional complexity to the current view of Ub signaling pathways.
authors.affiliation: Institute of Biochemistry II, Johann Wolfgang Goethe-University School of Medicine, Theodor-Stern-Kai 7, D-60590 Frankfurt, Germany.
authors.forename: Mirko H H
authors.initials: MHH
authors.lastname: Schmidt
authors.forename: Ivan
authors.initials: I
authors.lastname: Dikic
mesh_terms: D048868:Adaptor Proteins, Signal Transducing; D000818:Animals; D000075686:COP9 Signalosome Complex; D015536:Down-Regulation; D004705:Endocytosis; D066246:ErbB Receptors / Q000378:metabolism; D006801:Humans; D051379:Mice; D046912:Multiprotein Complexes / Q000378:metabolism; D000075687:NEDD8 Protein; D010447:Peptide Hydrolases / Q000378:metabolism; D050721:Proto-Oncogene Proteins c-cbl / Q000378:metabolism; D015398:Signal Transduction; D025841:Small Ubiquitin-Related Modifier Proteins / Q000378:metabolism; D014157:Transcription Factors / Q000378:metabolism; D025801:Ubiquitin / Q000378:metabolism*; D014452:Ubiquitins / Q000378:metabolism*
chemical_list: D048868:Adaptor Proteins, Signal Transducing; D046912:Multiprotein Complexes; D000075687:NEDD8 Protein; C082860:NEDD8 protein, human; C430242:NUB1 protein, human; C513172:Nedd8 protein, mouse; D025841:Small Ubiquitin-Related Modifier Proteins; D014157:Transcription Factors; D025801:Ubiquitin; D014452:Ubiquitins; D050721:Proto-Oncogene Proteins c-cbl; D066246:ErbB Receptors; D010447:Peptide Hydrolases; D000075686:COP9 Signalosome Complex