Component of a protein kinase signal transduction cascade. Mediator of TRAF6 and TGF-beta signal transduction. Activates IKBKB and MAPK8 in response to TRAF6 signaling. Stimulates NF-kappa-B activation and the p38 MAPK pathway. In osmotic stress signaling, plays a major role in the activation of MAPK8/JNK, but not that of NF-kappa-B.
Specificity
Natural and recombinant Human Mitogen-activated protein kinase kinase kinase 7
Binds both upstream activators and downstream substrates in multimolecular complexes. Interacts with TAB1/MAP3K7IP1 and TAB2/MAP3K7IP2. Identified in the TRIKA2 complex composed of MAP3K7, TAB1/MAP3K7IP1 and TAB2/MAP3K7IP2. Interacts with PPM1L. Interaction with PP2A and PPP6C leads to its repressed activity. Interacts with TRAF6 and TAB1/MAP3K7IP1; during IL-1 signaling. Interacts with TAOK1 and TAOK2; interaction with TAOK2 interferes with MAP3K7 interaction with IKKA, thus preventing NF-kappa-B activation. Interacts with WDR34 (via WD domains). Interacts with RBCK1. Interacts with CYLD. Interacts with TGFBR1; induces MAP3K7 activation by TRAF6. Interacts with MAPK8IP1 (By similarity). Interacts with isoform 1 of VRK2.