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MUDENG is cleaved by caspase-3 during TRAIL-induced cell death

Jin Na Shin1, Ji Hye Han, Ji-Young Kim

  • 1Department of Biochemistry, Chosun University School of Medicine, Gwang-Ju, Republic of Korea.

Biochemical and Biophysical Research Communications
|May 14, 2013
PubMed

Insights

MUDENG (AP5M1) is processed by caspase-3 during TRAIL-induced cell death. This cleavage, occurring in its adaptin domain, reduces MUDENG

Area of Science:

  • Molecular Biology
  • Cell Death Pathways
  • Apoptosis Research

Background:

  • MUDENG (AP5M1) is an adaptin domain-containing gene linked to lymphoma cell death.
  • The precise mechanism of MUDENG-mediated cell death remains largely uncharacterized.

Purpose of the Study:

  • To investigate MUDENG protein alterations during Tumor Necrosis Factor-Related Apoptosis-Inducing Ligand (TRAIL)-induced cell death.
  • To elucidate the role of MUDENG processing in apoptosis.

Main Methods:

  • Analysis of MUDENG processing in Jurkat and BJAB cells upon TRAIL stimulation.
  • In vitro cleavage assays using recombinant active caspase proteins to confirm caspase-3 mediation.
  • Identification of specific caspase cleavage sites within the MUDENG adaptin domain.

Main Results:

  • MUDENG undergoes rapid processing in response to TRAIL, correlating with caspase activation.
  • Caspase-3 was confirmed as the enzyme responsible for MUDENG cleavage.
  • Identified caspase cleavage sites at D276 and D290 within the MUDENG adaptin domain.
  • Cleaved MUDENG exhibited diminished cell-killing activity.

Conclusions:

  • The adaptin domain of MUDENG is crucial for its cell death-inducing function.
  • Caspase-3-mediated cleavage of MUDENG regulates its apoptotic activity.
  • MUDENG processing is a key event in TRAIL-mediated apoptosis.

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