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	Proc. Natl. Acad. Sci. U.S.A. Feb (1999); 96(3):1042-7
Identification of a cell protein (FIP-3) as a modulator of NF-kappaB activity and as a target of an adenovirus inhibitor of tumor necrosis factor alpha-induced apoptosis.
Li Y, Kang J, Friedman J, Tarassishin L, Ye J, Kovalenko A, Wallach D, Horwitz MS
Department of Microbiology and Immunology, Albert Einstein College of Medicine, Bronx, NY 10461, USA.
Abstract: FIP-3 (14.7K interacting protein) was discovered during a search for cell proteins that could interact with an adenovirus protein (Ad E3-14.7K) that had been shown to prevent tumor necrosis factor (TNF)-alpha-induced cytolysis. FIP-3, which contains leucine zippers and a zinc finger domain, inhibits both basal and induced transcriptional activity of NF-kappaB and causes a late-appearing apoptosis with unique morphologic manifestations. Ad E3-14.7K can partially reverse apoptotic death induced by FIP-3. FIP-3 also was shown to bind to other cell proteins, RIP and NIK, which previously had been described as essential components of TNF-alpha-induced NF-kappaB activation. In addition, FIP-3 inhibited activation of NF-kappaB induced by TNF-alpha, the TNFR-1 receptor, RIP, NIK, and IKKbeta, as well as basal levels of endogenous NF-kappaB in 293 cells. Because the activation of NF-kappaB has been shown to inhibit apoptosis, FIP-3 appears both to activate a cell-death pathway and to inhibit an NF-kappaB-dependent survival mechanism.
[PUBMED: 9927690]