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Related Concept Videos

Mitochondria01:37

Mitochondria

Mitochondria are eukaryotic cellular organelles that are known to produce energy through a process called oxidative phosphorylation. Besides their primary function, mitochondria are involved in various cellular processes, including cell growth, differentiation, signaling, metabolism, and senescence. Age-related changes cause a decline in mitochondrial quality and integrity due to increased mitochondrial mutations and oxidative damage. Thus, aging can severely impact mitochondrial functions,...
Mitochondria01:37

Mitochondria

Mitochondria are eukaryotic cellular organelles that are known to produce energy through a process called oxidative phosphorylation. Besides their primary function, mitochondria are involved in various cellular processes, including cell growth, differentiation, signaling, metabolism, and senescence. Age-related changes cause a decline in mitochondrial quality and integrity due to increased mitochondrial mutations and oxidative damage. Thus, aging can severely impact mitochondrial functions,...
Mitochondrial Membranes01:45

Mitochondrial Membranes

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,...
Mitochondrial Membranes01:45

Mitochondrial Membranes

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,...
The Inner Mitochondrial Membrane01:28

The Inner Mitochondrial Membrane

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...
The Supercomplexes in the Crista Membrane01:41

The Supercomplexes in the Crista Membrane

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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Related Experiment Video

Updated: Jun 6, 2026

Imaging of mtHyPer7, a Ratiometric Biosensor for Mitochondrial Peroxide, in Living Yeast Cells
09:47

Imaging of mtHyPer7, a Ratiometric Biosensor for Mitochondrial Peroxide, in Living Yeast Cells

Published on: June 2, 2023

Stressed-out mitochondria get MAD.

Marc Chatenay-Lapointe1, Gerald S Shadel

  • 1Department of Pathology, Yale University School of Medicine, New Haven, CT 06510, USA.

Cell Metabolism
|November 27, 2010
PubMed
Summary
This summary is machine-generated.

Mitochondria-associated protein degradation (MAD) targets endoplasmic reticulum-associated protein degradation (ERAD) components to damaged mitochondria, aiding mitochondrial homeostasis. This discovery reveals a novel pathway for maintaining organelle health.

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Area of Science:

  • Cell Biology
  • Molecular Biology
  • Organelle Biology

Background:

  • Mitochondrial integrity is crucial for cellular function and is maintained by various repair and degradation pathways.
  • Existing mechanisms include organelle-specific repair systems and complete organelle removal (degradation).

Discussion:

  • A novel mechanism, mitochondria-associated protein degradation (MAD), has been identified.
  • MAD links mitochondrial stress to the endoplasmic reticulum-associated protein degradation (ERAD) pathway.
  • This process specifically targets ERAD components towards oxidatively stressed mitochondria.

Key Insights:

  • MAD represents a new addition to the cellular toolkit for maintaining mitochondrial homeostasis.
  • This pathway facilitates the targeted removal of specific protein degradation machinery to damaged mitochondria.
  • The study highlights an intricate crosstalk between mitochondrial quality control and ERAD.

Outlook:

  • Further research can elucidate the precise molecular players and regulation of the MAD pathway.
  • Understanding MAD may offer new therapeutic targets for diseases associated with mitochondrial dysfunction.
  • This mechanism could be a conserved process across different cell types and organisms.