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Caspase substrates.

J C Timmer1, G S Salvesen

  • 1Graduate Program in Molecular Pathology, University of California San Diego, La Jolla, CA 92037, USA.

Cell Death and Differentiation
|November 4, 2006
PubMed
Summary
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Caspase substrates are numerous, but few are biologically relevant. This review clarifies caspase specificity and identifies key substrates with strong evidence for in vivo roles.

Area of Science:

  • Biochemistry
  • Molecular Biology
  • Cellular Biology

Background:

  • Caspases are proteases involved in apoptosis and inflammation.
  • In vitro studies identify numerous potential caspase substrates.
  • Distinguishing true in vivo substrates from 'innocent bystanders' is crucial.

Purpose of the Study:

  • To review caspase substrate recognition and specificity.
  • To provide resources for identifying and annotating caspase substrates.
  • To highlight validated in vivo caspase substrates.

Main Methods:

  • Literature review of caspase research.
  • Analysis of protein sequence databases for caspase cleavage sites.
  • Evaluation of experimental evidence for in vivo substrate relevance.

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Main Results:

  • Hundreds of potential caspase substrates exist in humans.
  • Only a small fraction of reported substrates are confirmed in vivo.
  • Specific human and mouse proteins demonstrate strong evidence of biological relevance.

Conclusions:

  • Caspase substrate identification requires rigorous validation.
  • Understanding true substrates is key to elucidating caspase functions.
  • This review offers a framework for future caspase substrate research.