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Death substrates come alive

A G Porter1, P Ng, R U Jänicke

  • 1Institute of Molecular and Cell Biology, National University of Singapore, Republic of Singapore. mcbagp@leonis.nus.sg

Bioessays : News and Reviews in Molecular, Cellular and Developmental Biology
|June 1, 1997
PubMed
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Caspases are key proteases in programmed cell death (apoptosis). Their cleavage of proteins like protein kinase C delta and nuclear lamins drives cellular dismantling and architectural changes during apoptosis.

Area of Science:

  • Molecular Biology
  • Cell Biology
  • Biochemistry

Background:

  • Programmed cell death (apoptosis) is a crucial biological process.
  • Interleukin 1 beta-converting enzyme (ICE)-like proteases, known as caspases, are central executioners of apoptosis.
  • Understanding caspase substrate cleavage is vital for deciphering cell death mechanisms.

Purpose of the Study:

  • To investigate the roles of specific caspase-mediated protein cleavages in apoptosis.
  • To elucidate how cleavage of various substrates contributes to the progression of cell death.

Main Methods:

  • Analysis of caspase activity during apoptosis.
  • Identification and characterization of caspase substrates.
  • Assessment of the functional consequences of substrate cleavage.

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Main Results:

  • Caspases cleave diverse proteins, including regulatory enzymes (e.g., protein kinase C delta), cell survival proteins (e.g., retinoblastoma protein), DNA repair enzymes, and structural proteins (e.g., nuclear lamins).
  • Cleavage of protein kinase C delta may initiate cell death.
  • Cleavage of retinoblastoma protein may inhibit cell survival functions.
  • Cleavage of structural proteins contributes to cellular architectural changes during apoptosis.

Conclusions:

  • Caspase-mediated proteolysis is a multi-step process involving both activation and inactivation of key protein substrates.
  • Specific substrate cleavages by caspases are essential for executing the morphological and functional changes characteristic of apoptosis.
  • Parallel and sequential proteolytic events orchestrated by caspases drive the complex process of cell death.