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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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Mitochondrial Precursor Proteins01:39

Mitochondrial Precursor Proteins

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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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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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ATP Synthase: Mechanism01:48

ATP Synthase: Mechanism

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In animals, the mitochondrial F1F0 ATP synthase is the key protein that synthesizes ATP molecules through a complex catalytic mechanism. While the nuclear genome encodes the majority of ATP synthase subunits, the mitochondrial genome encodes some of the enzyme's most critical components. The formation of this multi-subunit enzyme is a complex multi-step process regulated at the level of transcription, translation, and assembly. Defects in one or more of these steps can result in decreased...
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The Proteasome01:13

The Proteasome

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Eukaryotic cells can degrade proteins through several pathways. One of the most important among these is the ubiquitin-proteasome pathway. It helps the cell eliminate the misfolded, damaged, or unwarranted cytoplasmic proteins in a highly specific manner.
In this pathway, the target proteins are first tagged with small proteins called ubiquitin. This involves participation of a series of enzymes including— E1 (ubiquitin-activating enzyme), E2 (ubiquitin-conjugating enzyme), and E3...
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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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Related Experiment Video

Updated: Jul 11, 2025

Reconstitution of Msp1 Extraction Activity with Fully Purified Components
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Reconstitution of Msp1 Extraction Activity with Fully Purified Components

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Mitochondrial AAA+ proteases.

Yuichi Matsushima1

  • 1Department of Biological Sciences, Graduate School of Science, Osaka University, Toyonaka, Osaka, Japan.

The Enzymes
|November 9, 2023
PubMed
Summary

Mitochondria utilize four AAA+ proteases to degrade damaged proteins, ensuring cellular quality control. These proteases are crucial for maintaining mitochondrial function and overall cell health in animal cells.

Area of Science:

  • Cell Biology
  • Biochemistry
  • Molecular Biology

Background:

  • Mitochondria are vital organelles in eukaryotic cells, essential for energy production (ATP), calcium storage, and biosynthesis.
  • Approximately 1500 proteins function within mitochondria, necessitating efficient degradation pathways.
  • AAA+ proteases located in mitochondria play a critical role in protein quality control.

Purpose of the Study:

  • To review the known functions of mitochondrial AAA+ proteases in animal cells.
  • To highlight the importance of these proteases in maintaining mitochondrial integrity and cellular health.

Main Methods:

  • Literature review of existing research on mitochondrial AAA+ proteases.
  • Analysis of the roles of these proteases in protein degradation and quality control.
Keywords:
AAA+ proteaseClpXPLonMitochondriai-AAAm-AAA

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Main Results:

  • Mitochondrial AAA+ proteases are essential for degrading misfolded or damaged proteins.
  • These proteases contribute to various cellular functions beyond simple degradation.
  • The chapter consolidates information on the established roles of these enzymes in animal mitochondria.

Conclusions:

  • Mitochondrial AAA+ proteases are indispensable for cellular homeostasis.
  • Understanding these proteases offers insights into mitochondrial diseases and aging.
  • Further research into AAA+ protease mechanisms can reveal new therapeutic targets.