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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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Mitochondrial Protein Sorting01:39

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Mitochondria are double-membrane organelles of the eukaryotes involved in cellular metabolism, signaling, ATP synthesis, and programmed cell death.  Each of these processes requires specific proteins and enzymes that must be correctly sorted to the right mitochondrial subcompartment for the proper functioning of the organelle.
Most of these mitochondrial proteins are encoded by the nucleus and imported to the mitochondria as unfolded or loosely folded precursors. Mitochondrial precursors...
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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.
ROS generation is regulated and maintained at moderate levels necessary...
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Mitochondrial Precursor Proteins01:39

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Mitochondrial precursors are partially unfolded or loosely folded polypeptide chains. Newly synthesized precursors are inhibited from spontaneously folding into their native conformation by the cytosolic chaperones, heat shock proteins 70 (Hsp70), and mitochondrial import stimulation factors (MSFs). Precursors bound to MSFs are guided to the TOM70-TOM37 receptors, while precursors bound to Hsp70  chaperones are targetted to TOM20-TOM22 receptor complexes.
Most of the mitochondrial...
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The Inner Mitochondrial Membrane01:28

The Inner Mitochondrial Membrane

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The inner mitochondrial membrane is the primary site of ATP synthesis. The inner membrane domain that forms a smooth layer adjacent to the outer membrane is called the inner boundary membrane. This domain contains membrane transporters that drive metabolites in and out of the mitochondria.  In contrast, the inner membrane network that invaginates into the matrix space is called the cristae membrane. This domain accounts for principle mitochondrial function as it accommodates the protein...
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Mitochondrial Membranes01:45

Mitochondrial Membranes

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A single mitochondrion is a bean-shaped organelle enclosed by a double-membrane system. The outer membrane of mitochondria is smooth and contains many porins - the integral membrane transporters. Porins enable free diffusion of ions and small uncharged molecules through the outer mitochondrial membrane but limit the transport of molecules larger than 5000 Daltons. Further, the outer mitochondrial membrane forms a unique structure called membrane contact sites with other subcellular organelles,...
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Related Experiment Video

Updated: Feb 27, 2026

Author Spotlight: Fluorescence-Based Quantification of Mitochondrial Membrane Potential and Superoxide Levels Using Live Imaging in HeLa Cells
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Author Spotlight: Fluorescence-Based Quantification of Mitochondrial Membrane Potential and Superoxide Levels Using Live Imaging in HeLa Cells

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Mitochondrial quality control pathways: PINK1 acts as a gatekeeper.

Elvira P Leites1, Vanessa A Morais1

  • 1iMM Instituto de Medicina Molecular, Faculdade de Medicina, Universidade de Lisboa, 1649-028 Lisboa, Portugal.

Biochemical and Biophysical Research Communications
|June 26, 2017
PubMed
Summary

Mitochondria quality control is vital for cell survival and preventing diseases like neurodegeneration. The protein PINK1 acts as a gatekeeper, sensing mitochondrial health to maintain cellular homeostasis.

Keywords:
MitochondriaMitophagyPINK1Quality control

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Area of Science:

  • Cell Biology
  • Mitochondrial Biology
  • Molecular Medicine

Background:

  • Mitochondria are essential for cellular homeostasis, involved in ATP production, apoptosis, and calcium regulation.
  • Dysfunctional mitochondria are implicated in neurodegeneration, cancer, and neuromuscular atrophy.
  • Mechanisms regulating mitochondrial quality control are critical for cell fate but not fully understood.

Purpose of the Study:

  • To review current state-of-the-art pathways for mitochondrial quality control.
  • To highlight the role of the mitochondrial protein PINK1 in sensing mitochondrial integrity.

Main Methods:

  • Literature review of mitochondrial quality control pathways.
  • Focus on the function of PTEN-induced putative kinase 1 (PINK1).

Main Results:

  • Mitochondrial quality control pathways are crucial for maintaining cellular health.
  • PINK1 functions as a key regulator, acting as a gatekeeper for mitochondrial quality.
  • PINK1's ability to distinguish between healthy and damaged mitochondria is highlighted.

Conclusions:

  • Effective mitochondrial quality control is essential for preventing disease.
  • PINK1 plays a pivotal role in sensing and regulating mitochondrial quality.
  • Further understanding of these mechanisms can inform therapeutic strategies for mitochondrial dysfunction.