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Related Experiment Videos

A unified model for apical caspase activation.

Kelly M Boatright1, Martin Renatus, Fiona L Scott

  • 1The Program in Apoptosis and Cell Death Research, Burnham Institute, 10901 North Torrey Pines Road, University of California, San Diego, La Jolla, CA 92037, USA.

Molecular Cell
|March 7, 2003
PubMed
Summary

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Apical caspases, crucial for apoptosis, are activated by dimerization, not internal cleavage. This dimerization mechanism, observed for caspases-8 and -9, is stabilized by kosmotropes and essential for their function.

Area of Science:

  • Cellular biology
  • Biochemistry
  • Molecular mechanisms of cell death

Background:

  • Apoptosis is a regulated cell death process mediated by caspases.
  • Caspase activation typically involves a proteolytic cascade.
  • The precise mechanism of apical caspase activation within cellular complexes remains unclear.

Purpose of the Study:

  • To elucidate the mechanism of apical caspase activation.
  • To investigate the role of dimerization in caspase activity.
  • To propose a unified hypothesis for apical caspase activation.

Main Methods:

  • In vitro dimerization assays using kosmotropes.
  • Site-directed mutagenesis of caspase dimer interfaces.
  • Functional assessment of mutated caspases in mammalian cells.

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Main Results:

  • Apical caspase activation is driven by dimerization, not initial proteolysis.
  • Internal proteolysis serves to stabilize pre-activated dimers.
  • Dimerization of caspases-8 and -9 can be recapitulated in vitro with kosmotropes.
  • Mutations at the dimer interface abolish caspase activity in cells.

Conclusions:

  • A unified hypothesis proposes that apical caspases are activated via dimerization of monomeric zymogens.
  • Dimerization is the primary event conferring catalytic competence.
  • Internal proteolysis is a secondary event for stabilization, not activation.