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MDM2 Integrates Cellular Respiration and Apoptotic Signaling through NDUFS1 and the Mitochondrial Network

Rana Elkholi1, Ioana Abraham-Enachescu2, Andrew P Trotta2

  • 1Department of Oncological Sciences, Icahn School of Medicine at Mount Sinai, One Gustave L. Levy Place, New York, NY 10029, USA; The Tisch Cancer Institute, Icahn School of Medicine at Mount Sinai, One Gustave L. Levy Place, New York, NY 10029, USA; The Graduate School of Biomedical Sciences, Icahn School of Medicine at Mount Sinai, One Gustave L. Levy Place, New York, NY 10029, USA.

Molecular Cell
|March 19, 2019
PubMed

Insights

Mouse double minute 2 (MDM2) protein regulates mitochondrial function by binding NADH:ubiquinone oxidoreductase 75 kDa Fe-S protein 1 (NDUFS1). This interaction impairs respiration, increases oxidative stress, and triggers apoptosis independently of p53.

Area of Science:

  • Mitochondrial biology
  • Cellular signaling
  • Molecular oncology

Background:

  • The dual role of mouse double minute 2 (MDM2) as an oncogene and tumor suppressor complicates its cellular functions.
  • Understanding MDM2's diverse biochemical activities is crucial for deciphering complex eukaryotic signaling pathways.

Purpose of the Study:

  • To elucidate a novel function of MDM2 in regulating mitochondrial respiration and apoptosis.
  • To investigate the interaction between MDM2 and NADH:ubiquinone oxidoreductase 75 kDa Fe-S protein 1 (NDUFS1).

Main Methods:

  • Biochemical assays to study protein-protein interactions.
  • Organellar and cellular approaches to assess mitochondrial function.
  • In vivo studies using Drosophila and murine models.

Main Results:

  • MDM2 directly binds and sequesters NDUFS1, inhibiting its mitochondrial import.
  • This interaction leads to destabilization of mitochondrial complex I and supercomplexes, reducing oxidative phosphorylation efficiency.
  • Observed phenotypes include decreased mitochondrial respiration, increased oxidative stress, and apoptosis, independent of p53.

Conclusions:

  • MDM2 plays a critical role in mitochondrial homeostasis by regulating NDUFS1 localization and function.
  • The MDM2-NDUFS1 pathway represents a novel mechanism linking nuclear-encoded proteins to mitochondrial integrity and cell fate.
  • This pathway offers new insights into MDM2's function beyond its canonical role in p53 regulation and has implications for cancer biology.
Keywords:
BCL-2 familyMDM2NDUFS1apoptosiscomplex Imitochondria

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