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Examining BCL-2 Family Function with Large Unilamellar Vesicles
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Structural basis for the interaction between DJ-1 and Bcl-XL

Mi-Kyung Lee1, Min-Sung Lee2, Da-Woon Bae3

  • 1Disease Target Structure Research Center, KRIBB, Daejeon 34141, Republic of Korea.

Biochemical and Biophysical Research Communications
|November 28, 2017
PubMed

Insights

Oxidized DJ-1 protein binds to the Bcl-XL protein in mitochondria, protecting cells from death. This interaction, particularly via DJ-1's C-terminal peptide, offers a structural basis for DJ-1's role in cell survival pathways.

Area of Science:

  • Biochemistry
  • Molecular Biology
  • Cell Biology

Background:

  • DJ-1 is a multifunctional protein implicated in Parkinson's disease and cancer.
  • DJ-1 translocates to mitochondria upon UVB irradiation, interacting with Bcl-XL to prevent cell death.

Purpose of the Study:

  • To structurally characterize the molecular interaction between DJ-1 and Bcl-XL.
  • To elucidate the binding mechanism of DJ-1 to Bcl-XL.

Main Methods:

  • Nuclear Magnetic Resonance (NMR) spectroscopy, specifically chemical shift perturbation.
  • Structural modeling of protein complexes.

Main Results:

  • NMR data revealed that oxidized DJ-1 binds to a hydrophobic groove on Bcl-XL.
  • The C-terminal α8-helix peptide (Cpep) of DJ-1 functions as a Bcl-XL-binding motif.
  • The binding mode of DJ-1 Cpep to Bcl-XL resembles that of other pro-apoptotic BH3 peptides.

Conclusions:

  • The study provides a structural foundation for understanding how DJ-1 interacts with Bcl-XL.
  • This interaction is crucial for regulating Bcl-XL activity under oxidative stress conditions.
  • Findings contribute to the molecular understanding of DJ-1's role in cell survival and disease pathogenesis.
Keywords:
Bcl-X(L)Complex structureDJ-1NMR spectroscopyProtein interaction

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