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Related Experiment Videos

An induced proximity model for caspase-8 activation

M Muzio1, B R Stockwell, H R Stennicke

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

The Journal of Biological Chemistry
|February 28, 1998
PubMed
Summary

The Fas-associated death domain (FADD) protein recruits caspase-8 (FLICE) to the CD-95 receptor. This study shows that FLICE zymogen has intrinsic activity, enabling self-processing into an active protease for apoptosis.

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Area of Science:

  • Cellular Biology
  • Molecular Biology
  • Immunology

Background:

  • The CD-95 receptor initiates apoptosis through a death-inducing signaling complex.
  • This complex involves Fas-associated death domain (FADD) and caspase-8 (FLICE).
  • FLICE is the apical caspase in the Fas pathway, but its activation mechanism was unclear.

Purpose of the Study:

  • To investigate the activation mechanism of the caspase-8 (FLICE) zymogen.
  • To determine if FLICE possesses intrinsic enzymatic activity for autoprocessing.

Main Methods:

  • Synthesized chimeric Fpk3FLICE molecules for in vivo oligomerization using FK1012H2.
  • Created a nonprocessable zymogen form of FLICE to assess protease activity.

Main Results:

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  • Oligomerization of Fpk3FLICE induced apoptosis in transfected cells.
  • The nonprocessable FLICE zymogen retained detectable protease activity, supporting autoprocessing.

Conclusions:

  • The caspase-8 (FLICE) zymogen possesses intrinsic enzymatic activity.
  • FLICE autoprocesses into an active protease upon recruitment to the CD-95 death-inducing signaling complex, initiating apoptosis.