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Related Concept Videos

Mitochondrial Protein Sorting01:39

Mitochondrial Protein Sorting

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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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Protein Transport into the Inner Mitochondrial Membrane01:34

Protein Transport into the Inner Mitochondrial Membrane

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Nuclear encoded mitochondrial precursors are imported to the inner membrane in a multistep process involving two separate translocons, TIM22 and TIM23. TIM23 is a cation-selective pore that remains closed by the N terminal segment of the protein. Negative charges on the TIM23 act as a receptor for the incoming precursor, pulling the positively charged matrix-targeting sequence for peptide insertion and translocation.
Transport of mitochondrial precursors across the TIM23 channel is driven by...
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Electron Transport Chain: Complex I and II01:46

Electron Transport Chain: Complex I and II

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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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Translocation of Proteins into the Mitochondria01:19

Translocation of Proteins into the Mitochondria

3.1K
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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The Supercomplexes in the Crista Membrane01:41

The Supercomplexes in the Crista Membrane

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The mitochondrial cristae membrane is the primary site for the oxidative phosphorylation (OXPHOS) process of energy conversion mediated through respiratory complexes I to V. These complexes have been widely studied for decades, and it has been proven that they form supramolecular structures called respiratory supercomplexes (SC). These higher-order complexes may be crucial in maintaining the biochemical structure and improving the physiological activity of the individual complexes while...
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Mitochondrial Precursor Proteins01:39

Mitochondrial Precursor Proteins

2.6K
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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Related Experiment Video

Updated: Jul 12, 2025

Measurement of Protein Import Capacity of Skeletal Muscle Mitochondria
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Measurement of Protein Import Capacity of Skeletal Muscle Mitochondria

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Mitochondrial complexome and import network.

Fabian den Brave1, Uwe Schulte2, Bernd Fakler2

  • 1Institute of Biochemistry and Molecular Biology, Faculty of Medicine, University of Bonn, 53115 Bonn, Germany.

Trends in Cell Biology
|November 1, 2023
PubMed
Summary
This summary is machine-generated.

Mitochondria rely on interconnected protein networks for function. Protein translocases integrate these networks into the mitochondrial import network (MitimNet), coordinating essential cellular processes.

Keywords:
cell organellesenergeticsmetabolismmitochondriamorphologyprotein assemblyprotein networksprotein sorting

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Analyzing Supercomplexes of the Mitochondrial Electron Transport Chain with Native Electrophoresis, In-gel Assays, and Electroelution
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Area of Science:

  • Cell Biology
  • Biochemistry
  • Mitochondrial Biology

Background:

  • Mitochondria are vital organelles involved in cellular metabolism, biogenesis, quality control, and signaling.
  • Mitochondrial proteins function within complex interaction networks, not as isolated units.
  • Protein-protein interactions are key to the structural and functional organization of mitochondria.

Purpose of the Study:

  • To analyze protein complexes and interaction networks within mitochondria.
  • To understand the role of protein translocases in mitochondrial organization.
  • To elucidate the overarching mitochondrial import network (MitimNet).

Main Methods:

  • Systematic analysis of protein complexes.
  • Mapping of protein-protein interaction networks.
  • Integration of network data to define MitimNet.

Main Results:

  • Mitochondrial proteins are extensively interconnected through stable and dynamic interactions.
  • Protein translocases are central hubs in multiple mitochondrial protein networks.
  • These networks encompass chaperones, respiratory chain complexes, and membrane contact sites.

Conclusions:

  • Protein translocases integrate diverse mitochondrial networks into the comprehensive MitimNet.
  • MitimNet coordinates mitochondrial biogenesis, membrane organization, and overall function.
  • Understanding MitimNet provides insights into mitochondrial structural and functional coordination.