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Direct interaction of Smac with NADE promotes TRAIL-induced apoptosis

Kwiyeom Yoon1, Hyun Duk Jang, Soo Young Lee

  • 1Division of Molecular Life Sciences and Center for Cell Signaling Research, Ewha Womans University, Seoul 120-750, Republic of Korea.

Biochemical and Biophysical Research Communications
|June 5, 2004
PubMed

Insights

The interaction between Smac (second mitochondria-derived activator of caspase) and NADE (p75NTR-associated cell death executor) promotes apoptosis. This binding also inhibits Smac ubiquitination, offering new insights into apoptosis regulation.

Area of Science:

  • Cell biology
  • Molecular biology
  • Biochemistry

Background:

  • Second mitochondria-derived activator of caspase (Smac) plays a crucial role in initiating apoptosis, a programmed cell death process, particularly under cellular stress conditions.
  • Understanding the proteins that interact with Smac is vital for elucidating the intricate mechanisms governing Smac-mediated apoptosis.

Purpose of the Study:

  • To identify and characterize novel Smac/DIABLO-binding proteins.
  • To investigate the functional consequences of the interaction between Smac and its newly identified binding partner, NADE, on apoptosis regulation.

Main Methods:

  • Protein-protein interaction screening to identify Smac-binding partners.
  • Mapping of interaction domains between Smac and NADE using biochemical techniques.
  • Functional assays involving co-expression of Smac and NADE to assess their impact on TRAIL-induced apoptosis in MCF-7 cells.
  • Analysis of Smac ubiquitination in the presence of Smac, NADE, and XIAP.

Main Results:

  • NADE (p75NTR-associated cell death executor) was identified as a novel Smac-binding protein.
  • The interaction interface was mapped to the N-terminal region of Smac and the C-terminal region of NADE.
  • Co-expression of Smac and NADE enhanced TRAIL-induced apoptosis in MCF-7 cells.
  • The simultaneous presence of Smac and NADE was found to inhibit XIAP-mediated ubiquitination of Smac.

Conclusions:

  • The interaction between Smac and NADE represents a novel regulatory mechanism in apoptosis.
  • This interaction modulates apoptosis by inhibiting Smac ubiquitination, thereby potentially enhancing its pro-apoptotic function.
  • These findings provide the first evidence for Smac-NADE interaction in the context of apoptosis regulation.

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