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NF-kappaB activator Act1 associates with IL-1/Toll pathway adaptor molecule TRAF6.

Kanamori M., Kai C., Hayashizaki Y., Suzuki H.

NF-kappaB activator 1 (Act1), also called CIKS, is a recently identified protein with NF-kappaB and AP-1 activation activities through its association with the IkappaB kinase complex. We identified and confirmed that Act1 interacts with tumor necrosis factor receptor-associated factor 6 (TRAF6); notably, Act1 binds to TRAF6 only among TRAF family proteins. The amino-terminal half of Act1 is required for its interaction with the TRAF domain. Act1-mediated NF-kappaB activation was inhibited by a dominant-negative mutant of TRAF6 in a dose-dependent manner, and IL-1-induced NF-kappaB activation was inhibited by a high level of Act1 expression. Our results suggest that Act1 is involved in IL-1/Toll-mediated signaling through TRAF6.

FEBS Lett. 532:241-246(2002) [PubMed] [Europe PMC]

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