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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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Mitochondria01:37

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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,...
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Autophagy01:27

Autophagy

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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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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.
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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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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 16, 2025

Visualizing Mitophagy with Fluorescent Dyes for Mitochondria and Lysosome
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Visualizing Mitophagy with Fluorescent Dyes for Mitochondria and Lysosome

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Mitochondrial degradation: Mitophagy and beyond.

Louise Uoselis1, Thanh Ngoc Nguyen1, Michael Lazarou1

  • 1Walter and Eliza Hall Institute of Medical Research, Parkville, VIC, Australia; Department of Biochemistry and Molecular Biology, Biomedicine Discovery Institute, Monash University, Melbourne, VIC, Australia; Department of Medical Biology, University of Melbourne, Melbourne, VIC, Australia; Aligning Science Across Parkinson's Collaborative Research Network, Chevy Chase, MD 20185, USA.

Molecular Cell
|September 14, 2023
PubMed
Summary
This summary is machine-generated.

Cells degrade unwanted mitochondria through pathways like mitophagy and extrusion to maintain cellular health and metabolic balance. This review explores the signals and contexts governing these essential mitochondrial quality control mechanisms.

Keywords:
MDVPINK1Parkindegradationmitochondriamitochondrial quality controlmitophagyproteasomeselective autophagyubiquitin

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Author Spotlight: Detection of Mitophagy in Caenorhabditis elegans and Mammalian Cells Using Organelle-Specific Dyes
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Last Updated: Jul 16, 2025

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Area of Science:

  • Cellular Biology
  • Mitochondrial Biology
  • Metabolic Regulation

Background:

  • Mitochondria are vital for cellular metabolism, signaling, and disease.
  • Maintaining mitochondrial quality and activity is crucial for cellular homeostasis.
  • Mitochondrial degradation pathways are key to mitochondrial quality control and metabolic regulation.

Purpose of the Study:

  • To review the diverse mechanisms cells use to degrade mitochondria.
  • To discuss the molecular signals that initiate mitochondrial degradation.
  • To explore the cellular and physiological contexts for these degradation pathways.

Main Methods:

  • Literature review of mitochondrial degradation pathways.
  • Analysis of molecular signals involved in mitochondrial removal.
  • Examination of cellular and physiological triggers for degradation.

Main Results:

  • Cells employ various strategies for mitochondrial removal, including mitophagy and extrusion.
  • Specific molecular signals orchestrate the engagement of different degradation pathways.
  • Context-dependent activation of these pathways ensures cellular homeostasis.

Conclusions:

  • Mitochondrial degradation is a multifaceted process essential for cellular health.
  • Understanding these pathways offers insights into metabolic regulation and disease.
  • Diverse signals and contexts dictate the specific mitochondrial removal strategy employed by cells.