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• W2130114526 startingPage "737" @default.
• W2130114526 abstract "Mitogen-activated protein kinase (MAPK) pathways coordinate critical cellular responses to mitogens, stresses, and developmental cues. The coupling of MAPK kinase kinase (MAP3K) → MAPK kinase (MEK) → MAPK core pathways to cell surface receptors remains poorly understood. Recombinant forms of MAP3K MEK kinase 1 (MEKK1) interact in vivo and in vitro with the STE20 protein homologue germinal center kinase (GCK), and both GCK and MEKK1 associate in vivo with the adapter protein tumor necrosis factor (TNF) receptor-associated factor 2 (TRAF2). These interactions may couple TNF receptors to the SAPK/JNK family of MAPKs; however, a molecular mechanism by which these proteins might collaborate to recruit the SAPKs/JNKs has remained elusive. Here we show that endogenous GCK and MEKK1 associate in vivo. In addition, we have developed an in vitro assay system with which we demonstrate that purified, active GCK and TRAF2 activate MEKK1. The RING domain of TRAF2 is necessary for optimal in vitro activation of MEKK1, but the kinase domain of GCK is not. Autophosphorylation within the MEKK1 kinase domain activation loop is required for activation. Forced oligomerization also activates MEKK1, and GCK elicits enhanced oligomerization of coexpressed MEKK1 in vivo. These results represent the first activation of MEKK1 in vitro using purified proteins and suggest a mechanism for MEKK1 activation involving induced oligomerization and consequent autophosphorylation mediated by upstream proteins." @default.
• W2130114526 created "2016-06-24" @default.
• W2130114526 creator A5002801100 @default.
• W2130114526 creator A5024588859 @default.
• W2130114526 creator A5068575679 @default.
• W2130114526 date "2002-02-01" @default.
• W2130114526 modified "2023-10-11" @default.
• W2130114526 title "Direct Activation of Mitogen-Activated Protein Kinase Kinase Kinase MEKK1 by the Ste20p Homologue GCK and the Adapter Protein TRAF2" @default.
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• W2130114526 doi "https://doi.org/10.1128/mcb.22.3.737-749.2002" @default.
• W2130114526 hasPubMedCentralId "https://www.ncbi.nlm.nih.gov/pmc/articles/133545" @default.
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• W2130114526 hasPublicationYear "2002" @default.
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