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RAIDD is a new 'death' adaptor molecule

H Duan1, V M Dixit

  • 1Department of Pathology, University of Michigan Medical School, Ann Arbor 48109, USA.

Nature
|January 2, 1997
PubMed
Summary
This summary is machine-generated.

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Researchers identified RAIDD, an adaptor molecule linking cell-death proteases to signaling pathways. RAIDD

Area of Science:

  • Molecular Biology
  • Cell Biology
  • Biochemistry

Background:

  • The cell-death pathway's effector arm involves ICE/CED-3 family cysteine proteases.
  • These proteases function as inactive zymogens in metazoan cells, requiring prodomain cleavage for activation.
  • Adaptor molecules with death domains likely couple these proteases to signaling pathways.

Purpose of the Study:

  • To identify and characterize novel adaptor molecules involved in the cell-death pathway.
  • To elucidate the mechanism by which death proteases are recruited to signaling complexes.

Main Methods:

  • Protein interaction studies using yeast two-hybrid or co-immunoprecipitation assays.
  • Analysis of protein domain homology and function.
  • Site-directed mutagenesis to investigate the role of specific domains.

Related Experiment Videos

Main Results:

  • A novel adaptor molecule, RAIDD (a death domain-containing RAIDD), was identified.
  • RAIDD possesses a bipartite structure with a death domain and an N-terminal domain homologous to ICE/CED-3 prodomains.
  • RAIDD directly binds to RIP, a serine/threonine kinase, via its death domain.
  • The N-terminal domain of RAIDD mediates homophilic binding to ICH-1 and CED-3 prodomains, linking them to the death proteases.
  • Mutations in RAIDD's N-terminal domain analogous to inactivating ced-3 mutations abolish homophilic binding.

Conclusions:

  • RAIDD acts as a crucial adaptor, bridging RIP kinase and ICE/CED-3 family proteases in the cell-death pathway.
  • The prodomain homology suggests a conserved mechanism for specific zymogen recruitment via homophilic interactions.
  • This interaction highlights a potentially ancient mechanism for regulating protease activation in apoptosis.