sickle , a Novel Drosophila Death Gene in the reaper/hid/grim Region, Encodes an IAP-Inhibitory Protein

sickle , a Novel Drosophila Death Gene in the reaper/hid/grim Region, Encodes an IAP-Inhibitory... Inhibitors of apoptosis proteins (IAPs) interact with caspases and inhibit their protease activity, whereas the IAP-inhibitory proteins Smac/DIABLO in mammals and Reaper, Hid, and Grim in flies relieve IAP-mediated inhibition (1–5) to induce cell death. Here we describe the functional characterization of the novel Drosophila cell death protein Sickle (Skl), which binds to IAPs and neutralizes their apoptotic inhibitory activity. Skl exhibits no sequence homology to Reaper, Hid, Grim, or Smac/DIABLO, except within the 4 residue N-terminal IAP binding motif. Skl interacts with Drosophila and mammalian IAPs and can promote caspase activation in the presence of IAPs. Consistent with these findings, expression of Skl in Drosophila and mammalian cell lines or in Drosophila embryos induces apoptosis. Skl can also synergize with Grim to induce cell death in the Drosophila eye imaginal disc. Based on biochemical and structural data, the N terminus of Skl, like that of the mammalian Smac/DIABLO, is absolutely required for its apoptotic and caspase-promoting activities and its ability to interact with IAPs. These findings point to conservation in the structure and function of the IAP-inhibitory proteins across species and suggest the existence of other family members. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Current Biology Elsevier

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Publisher
Elsevier
Copyright
Copyright © 2002 Cell Press
ISSN
0960-9822
DOI
10.1016/S0960-9822(01)00657-1
Publisher site
See Article on Publisher Site

Abstract

Inhibitors of apoptosis proteins (IAPs) interact with caspases and inhibit their protease activity, whereas the IAP-inhibitory proteins Smac/DIABLO in mammals and Reaper, Hid, and Grim in flies relieve IAP-mediated inhibition (1–5) to induce cell death. Here we describe the functional characterization of the novel Drosophila cell death protein Sickle (Skl), which binds to IAPs and neutralizes their apoptotic inhibitory activity. Skl exhibits no sequence homology to Reaper, Hid, Grim, or Smac/DIABLO, except within the 4 residue N-terminal IAP binding motif. Skl interacts with Drosophila and mammalian IAPs and can promote caspase activation in the presence of IAPs. Consistent with these findings, expression of Skl in Drosophila and mammalian cell lines or in Drosophila embryos induces apoptosis. Skl can also synergize with Grim to induce cell death in the Drosophila eye imaginal disc. Based on biochemical and structural data, the N terminus of Skl, like that of the mammalian Smac/DIABLO, is absolutely required for its apoptotic and caspase-promoting activities and its ability to interact with IAPs. These findings point to conservation in the structure and function of the IAP-inhibitory proteins across species and suggest the existence of other family members.

Journal

Current BiologyElsevier

Published: Jan 22, 2002

References

  • The damage-responsive Drosophila gene Sickle encodes a novel IAP binding protein similar to but distinct from Reaper, Grim and Hid
    Christich, A.; Kauppila, S.; Chen, P.; Sogame, N.; Abrams, J.M.
  • Drosophila sickle is a novel grim-reaper cell death activator
    Wing, J.P.; Karres, J.; Ogdahl, J.L.; Zhou, L.; Schwartz, L.M.; Nambu, J.R.

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