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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.
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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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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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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Autophagic Cell Death01:18

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Christian de Duve discovered “autophagy,” a process in which cellular components are engulfed by membrane-bound organelles called autophagosomes. The autophagosomes then fuse with lysosomes to digest the enclosed contents. Autophagy is generally activated in cells to prevent cell death. However, cell death is triggered when the damage is beyond repair.
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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.
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Related Experiment Video

Updated: May 21, 2025

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

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Advances in mitophagy initiation mechanisms.

Catharina Küng1, Michael Lazarou2, Thanh Ngoc Nguyen2

  • 1Walter and Eliza Hall Institute of Medical Research, Parkville, Victoria, Australia; Department of Medical Biology, University of Melbourne, Melbourne, Victoria, Australia.

Current Opinion in Cell Biology
|March 21, 2025
PubMed
Summary
This summary is machine-generated.

Mitophagy removes damaged mitochondria via specific pathways. This review explores recent advances in understanding mitophagy initiation mechanisms for potential therapeutic targeting.

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Area of Science:

  • Cell Biology
  • Molecular Biology
  • Biochemistry

Background:

  • Mitophagy is a crucial lysosomal pathway for removing damaged mitochondria, essential for cellular and organismal homeostasis.
  • Understanding mitophagy initiation is key for developing targeted mitophagy-inducing therapeutics.
  • Diverse cellular and mitochondrial stimuli trigger mitophagy through various autophagy receptors and adaptors.

Purpose of the Study:

  • To review recent advances in the mechanisms of mitophagy initiation.
  • To highlight the mechanistic plasticity in autophagosome formation during mitophagy.

Main Methods:

  • Literature review of recent studies on mitophagy initiation.
  • Analysis of signaling pathways and molecular players involved in mitophagy.
  • Synthesis of findings on stimuli-response mechanisms in mitophagy.

Main Results:

  • Mitophagy initiation involves a complex interplay of autophagy receptors and adaptors responding to distinct stimuli.
  • Mechanistic plasticity allows for diverse autophagosome formation strategies depending on the cellular context.
  • Recent advances reveal novel pathways and regulatory networks governing mitophagy.

Conclusions:

  • The initiation of mitophagy is a highly adaptable process with significant therapeutic potential.
  • Further research into mitophagy mechanisms can lead to novel treatments for various diseases.
  • Understanding the plasticity of autophagosome formation is critical for harnessing mitophagy's benefits.