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In Vivo Biosensor Tracks Non-apoptotic Caspase Activity in Drosophila
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The DIAP1 RING finger mediates ubiquitination of Dronc and is indispensable for regulating apoptosis

Rebecca Wilson1, Lakshmi Goyal, Mark Ditzel

  • 1The Breakthrough Toby Robins Breast Cancer Research Centre, Institute of Cancer Research, Chester Beatty Laboratories, Fulham Road, London SW3 6JB, UK.

Nature Cell Biology
|May 22, 2002
PubMed

Insights

Inhibitor of Apoptosis Proteins (IAPs) prevent cell death by marking caspases for ubiquitination. The DIAP1 RING finger is crucial for this process, ensuring apoptosis regulation in Drosophila.

Area of Science:

  • Cell Biology
  • Molecular Biology
  • Genetics

Background:

  • Inhibitor of Apoptosis Proteins (IAPs) are critical regulators of programmed cell death.
  • IAPs bind and inhibit pro-apoptotic caspases, preventing intrinsic cell death.
  • In Drosophila, Reaper (Rpr), Grim, and Hid antagonize Drosophila IAP1 (DIAP1) to induce apoptosis.

Purpose of the Study:

  • To investigate the role of the DIAP1 RING finger in apoptosis regulation.
  • To determine the mechanism by which DIAP1 antagonizes pro-apoptotic proteins.
  • To elucidate the function of DIAP1 ubiquitination in caspase activity.

Main Methods:

  • In vivo studies in Drosophila melanogaster.
  • Analysis of DIAP1 RING finger function in apoptosis.
  • Assays for protein binding and ubiquitination.
  • Investigation of Dronc ubiquitination and its impact on apoptosis.

Main Results:

  • The DIAP1 RING finger is essential for apoptosis induced by Rpr, Hid, and Dronc in vivo.
  • The DIAP1 RING finger promotes self-ubiquitination and Dronc ubiquitination.
  • Disruption of the DIAP1 RING finger abrogates Dronc ubiquitination without affecting binding to Rpr, Hid, or Dronc.

Conclusions:

  • DIAP1's RING finger is critical for targeting caspases for ubiquitination.
  • IAPs likely suppress apoptosis by facilitating caspase ubiquitination.
  • This mechanism highlights a conserved role for ubiquitination in apoptosis control.

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