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Scythe: a novel reaper-binding apoptotic regulator
K Thress1, W Henzel, W Shillinglaw
1Department of Pharmacology and Cancer Biology, Duke University Medical Center, C366 LSRC, Research Drive, Durham, NC 27710, USA.
The EMBO Journal
|November 3, 1998
Summary
Reaper protein triggers apoptosis by interacting with Scythe, a novel protein essential for this cell death pathway. Scythe
Area of Science:
- Cell Biology
- Molecular Biology
- Biochemistry
Background:
- Reaper is a key regulator of apoptosis (programmed cell death) in Drosophila melanogaster.
- Reaper's mechanism of action has been unclear due to its lack of catalytic activity and homology to known regulators.
- Previous research indicated Reaper induces mitochondrial cytochrome c release and caspase activation in Xenopus egg extracts.
Purpose of the Study:
- To elucidate the mechanism of action of Reaper in apoptosis.
- To identify and characterize proteins that interact with Reaper in the apoptotic pathway.
- To determine the role of novel Reaper-interacting proteins in apoptosis.
Main Methods:
- Purification of Reaper-interacting proteins from Xenopus egg extracts.
- Characterization of the purified protein, named Scythe, including its conservation and domain structure.
- Functional assays using immunodepletion and truncated Scythe variants to assess its role in Reaper-induced apoptosis.
Main Results:
- A 150 kDa Reaper-interacting protein, named Scythe, was purified from Xenopus egg extracts.
- Scythe is conserved across vertebrates and possesses a ubiquitin-like domain.
- Immunodepletion of Scythe blocked Reaper-induced apoptosis, while a truncated Scythe induced apoptosis independently of Reaper.
Conclusions:
- Scythe is a novel apoptotic regulator.
- Scythe is an essential component of the Reaper-induced apoptosis pathway.
- Scythe's N-terminal domain is crucial for its function in Reaper-mediated apoptosis.