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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.
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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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Covalently Linked Protein Regulators02:04

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Proteins can undergo many types of post-translational modifications, often in response to changes in their environment. These modifications play an important role in the function and stability of these proteins. Covalently linked molecules include functional groups, such as methyl, acetyl, and phosphate groups, and also small proteins, such as ubiquitin. There are around 200 different types of covalent regulators that have been identified.
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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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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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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.
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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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Related Experiment Video

Updated: Feb 28, 2026

Visualizing Mitophagy with Fluorescent Dyes for Mitochondria and Lysosome
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Mitophagy Transcriptome: Mechanistic Insights into Polyphenol-Mediated Mitophagy.

Sijie Tan1, Esther Wong1

  • 1School of Biological Sciences, Nanyang Technological University, Singapore.

Oxidative Medicine and Cellular Longevity
|June 20, 2017
PubMed
Summary

Mitophagy, the removal of damaged mitochondria, is crucial for cellular health and longevity. Dietary polyphenols show promise in activating mitophagy, offering a natural way to enhance mitochondrial function and prevent age-related diseases.

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In Vitro and In Vivo Detection of Mitophagy in Human Cells, C. Elegans, and Mice
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Area of Science:

  • Cellular Biology
  • Mitochondrial Dynamics
  • Autophagy

Background:

  • Mitochondria are vital for cellular energy production and signaling, essential for homeostasis.
  • Mitochondrial dysfunction is implicated in aging and various diseases.
  • Mitophagy, a selective form of autophagy, removes damaged mitochondria, maintaining cellular quality control.

Purpose of the Study:

  • To review the surveillance mechanisms and transcriptional regulation of mitophagy.
  • To explore the functional connection between polyphenols and mitophagy.
  • To provide insights into the mechanisms of polyphenol-induced mitophagy for potential therapeutic applications.

Main Methods:

  • Literature review focusing on mitochondrial quality control pathways.
  • Analysis of transcriptional regulatory mechanisms governing mitophagy.
  • Examination of studies investigating the role of polyphenols in mitophagy induction.

Main Results:

  • Mitophagy activation mitigates mitochondrial accumulation and toxicity, preserving mitochondrial fitness.
  • Polyphenols have demonstrated the ability to protect mitochondrial health by facilitating mitophagy.
  • Mitochondrial stress and toxins are potent inducers of mitophagy.

Conclusions:

  • Mitophagy is a key target for promoting longevity and preventing age-related diseases.
  • Dietary intake of polyphenols presents a promising strategy for augmenting mitophagy.
  • Understanding polyphenol-induced mitophagy mechanisms can lead to novel cellular protection strategies.