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FADD self-association is required for stable interaction with an activated death receptor
C Sandu1, G Morisawa, I Wegorzewska
1Laboratory of Molecular Biophysics, The Rockefeller University, New York, NY 10021, USA.
Cell Death and Differentiation
|May 20, 2006
Summary
Programmed cell death relies on the FADD adaptor protein. FADD self-association via its DED domain is essential for forming the death-inducing signaling complex and initiating cell death.
Area of Science:
- Cell Biology
- Molecular Biology
- Immunology
Background:
- Receptor-mediated programmed cell death is crucial for development and tissue homeostasis.
- The adaptor protein FADD (Fas-associated death domain) plays a central role in assembling death-inducing signaling complexes (DISCs).
- FADD recruits initiator procaspases (caspase-8/10) to activated death receptors.
Purpose of the Study:
- To investigate the role of FADD self-association in DISC formation.
- To elucidate the structural requirements for FADD's function in programmed cell death.
- To propose a revised model for FADD signaling complex architecture.
Main Methods:
- Biochemical dissection of the FADD death effector domain (DED).
- Functional replacement of DED with engineered oligomerization motifs of defined stoichiometries.
- Analysis of DISC assembly and competence following disruption of FADD self-association.
Main Results:
- FADD self-association through its DED is obligatory for DISC assembly.
- The caspase-recruitment function of FADD can be functionally separated from its self-association.
- Disruption of FADD self-association prevents the formation of a competent signaling complex.
Conclusions:
- FADD self-association is a critical prerequisite for initiating programmed cell death.
- FADD acts as a molecular bridge, organizing activated death receptors into a signaling array.
- This finding offers a new perspective on the architecture and function of FADD-mediated signaling complexes.
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