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© The Rockefeller University Press, 0021-9525/1999//141 $5.00
The Journal of Cell Biology, Volume 146, Number 1, , 1999 141-148


Original Article

Dap-Kinase Participates in TNF-{alpha}–And FAS-Induced Apoptosis and Its Function Requires the Death Domain



Ofer Cohena, Boaz Inbala, Joseph L. Kissila, Tal Raveha, Hanna Berissia, Taly Spivak-Kroizamana, Elena Feinsteina, and Adi Kimchia

a Department of Molecular Genetics, Weizmann Institute of Science, Rehovot 76100, Israel
Department of Molecular Genetics, Weizmann Institute of Science, Rehovot 76100, Israel.972-8-9344108972-8-9342428

lvkimchi{at}weizmann.weizmann.ac.il

Death-associated protein (DAP)–kinase is a calcium/calmodulin regulated serine/threonine kinase that carries ankyrin repeats, a death domain, and is localized to the cytoskeleton. Here, we report that this kinase is involved in tumor necrosis factor (TNF)-{alpha} and Fas-induced apoptosis. Expression of DAP-kinase antisense RNA protected cells from killing by anti–Fas/APO-1 agonistic antibodies. Deletion of the death domain abrogated the apoptotic functions of the kinase, thus, documenting for the first time the importance of this protein domain. Overexpression of a fragment encompassing the death domain of DAP-kinase acted as a specific dominant negative mutant that protected cells from TNF-{alpha}, Fas, and FADD/MORT1–induced cell death. DAP-kinase apoptotic function was blocked by bcl-2 as well as by crmA and p35 inhibitors of caspases, but not by the dominant negative mutants of FADD/MORT1 or of caspase 8. Thus, it functions downstream to the receptor complex and upstream to other caspases. The multidomain structure of this serine/threonine kinase, combined with its involvement in cell death induced by several different triggers, place DAP-kinase at one of the central molecular pathways leading to apoptosis.

Key Words: DAP-kinase • tumor necrosis factor-{alpha} • Fas • death domain • apoptosis



© 1999 The Rockefeller University Press

1.used in this paper: {Delta}CAM, deletion of calmodulin regulatory domain; CARD, caspase-recruiting domain; DAP, death-associated protein; DD, death domain; DISC, death-inducing signaling complex; DN-MORT/FADD, dominant negative mutant of MORT/FADD; GFP, green fluorescent protein; ICE, interleukin 1β–converting enzyme; IFN-{gamma}, interferon-{gamma}; PARP,poly (ADP–ribose) polymerase; TNF, tumor necrosis factor; TNF-R, TNF-{alpha} receptor



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