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Related Concept Videos

Translocation of Proteins into the Mitochondria01:19

Translocation of Proteins into the Mitochondria

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Mitochondrial precursors are translocated to the internal subcompartments via independent mechanisms involving distinct protein machineries called translocases.
Sorting of outer membrane proteins:
Mitochondrial outer membrane proteins are of two types: the transmembrane, beta-barrel porins, and the membrane-anchored, alpha-helical proteins. Beta-barrel porin precursors are translocated by the TOM complex and inserted into the outer mitochondrial membrane by the SAM complex. In contrast,...
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Pyruvate Oxidation01:15

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After glycolysis, the charged pyruvate molecules enter the mitochondria via active transport and undergo three enzymatic reactions. These reactions ensure that pyruvate can enter the next metabolic pathway so that energy stored in the pyruvate molecules can be harnessed by the cells.
First, the enzyme pyruvate dehydrogenase removes the carboxyl group from pyruvate and releases it as carbon dioxide. The stripped molecule is then oxidized and releases electrons, which are then picked up by NAD+...
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Delivery Pathways to the Lysosome01:36

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Eukaryotic cells use different mechanisms to eliminate toxic waste obsolete and worn-out substances. Lysosomes play a pivotal role in this, and hence, these substances are carried to the lysosome from other parts of the cell and extracellular space through different pathways. The most elaborately studied pathways to the lysosome are the endocytic pathways.
Endocytosis
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Electron Transport Chain: Complex I and II01:46

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The mitochondrial electron transport chain (ETC) is the main energy generation system in the eukaryotic cells. However, mitochondria also produce cytotoxic reactive oxygen species (ROS) due to the large electron flow during oxidative phosphorylation. While Complex I is one of the primary sources of superoxide radicals, ROS production by Complex II is uncommon and may only be observed in cancer cells with mutated complexes.
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Autophagy01:27

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Autophagy is a self-digesting process by which a cell protects itself from threats both within and outside the cell, ranging from abnormal proteins to invading bacteria. In this process, obsolete components of the cell and invading microbes are degraded by hydrolytic enzymes active in an acidic environment of the lysosomal lumen.
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Autophagic Cell Death01:18

Autophagic Cell Death

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Christian de Duve discovered “autophagy,” a process in which cellular components are engulfed by membrane-bound organelles called autophagosomes. The autophagosomes then fuse with lysosomes to digest the enclosed contents. Autophagy is generally activated in cells to prevent cell death. However, cell death is triggered when the damage is beyond repair.
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Related Experiment Video

Updated: Apr 10, 2026

Time-Lapse Video Microscopy for Assessment of EYFP-Parkin Aggregation as a Marker for Cellular Mitophagy
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Time-Lapse Video Microscopy for Assessment of EYFP-Parkin Aggregation as a Marker for Cellular Mitophagy

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Pyruvate stimulates mitophagy via PINK1 stabilization.

Sungwoo Park1, Seon-Guk Choi1, Seung-Min Yoo1

  • 1Global Research Laboratory, School of Biological Science, Seoul National University, 1 Gwanak-ro, Gwanak-gu, Seoul 151-747, South Korea.

Cellular Signalling
|June 14, 2015
PubMed
Summary

Pyruvate is essential for mitophagy, a process clearing damaged mitochondria. It aids PINK1 stabilization and PARK2 translocation, crucial steps in mitochondrial degradation, independent of cellular energy levels.

Keywords:
LC3MitophagyPARK2PDK4PINK1Pyruvate

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Sensitive Measurement of Mitophagy by Flow Cytometry Using the pH-dependent Fluorescent Reporter mt-Keima
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Related Experiment Videos

Last Updated: Apr 10, 2026

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Sensitive Measurement of Mitophagy by Flow Cytometry Using the pH-dependent Fluorescent Reporter mt-Keima
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Sensitive Measurement of Mitophagy by Flow Cytometry Using the pH-dependent Fluorescent Reporter mt-Keima

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Area of Science:

  • Cell Biology
  • Mitochondrial Biology
  • Autophagy

Background:

  • Mitophagy is a critical cellular process for removing damaged mitochondria.
  • The precise regulatory mechanisms governing mitophagy remain incompletely understood.
  • Identifying novel regulators is key to understanding mitophagy dysfunction.

Purpose of the Study:

  • To identify novel regulators of mitophagy.
  • To elucidate the role of pyruvate in mitophagy.
  • To investigate the molecular mechanisms of pyruvate-dependent mitophagy.

Main Methods:

  • Screening of a cDNA expression library encoding mitochondrial proteins.
  • Utilizing a cell-based fluorescence assay for CCCP-induced mitophagy.
  • Measuring pyruvate levels in cytosol and mitochondria.
  • Assessing protein interactions and localization (PINK1, PARK2, LC3, TOMM20).

Main Results:

  • PDK4 was identified as a mitophagy regulator that enhances mitochondrial clearance.
  • Ectopic PDK4 expression increased pyruvate levels and stimulated mitophagy.
  • Pyruvate is essential for efficient mitochondrial degradation during mitophagy.
  • Pyruvate is required for PINK1 stabilization, PARK2 translocation, and LC3 recruitment.
  • Pyruvate mediates mitophagy by facilitating the PINK1-TOMM20 interaction, independent of energy metabolism.

Conclusions:

  • Pyruvate is a critical, non-energy-dependent regulator of mitophagy.
  • Pyruvate plays a key role in the PINK1/PARK2-mediated mitophagy pathway.
  • These findings reveal a novel mechanism regulating mitochondrial quality control.