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Related Concept Videos

Translocation of Proteins into the Mitochondria01:19

Translocation of Proteins into the Mitochondria

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,...
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,...
Energy to Drive Translocation01:37

Energy to Drive Translocation

Mitochondrial protein import is powered by two distinct energy sources: ATP hydrolysis and electrochemical potential across the inner membrane. Newly synthesized precursors are bound by cytosolic chaperones of the Hsp70 family, which guide them to the import receptors on the mitochondrial surface. Utilizing the energy of ATP hydrolysis, Hsp70 chaperones transfer these precursors to the TOM receptors on the mitochondrial outer membrane.
Generally, polypeptides are unfolded by two distinct...
Mitochondrial Protein Sorting01:39

Mitochondrial Protein Sorting

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...
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...

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Related Experiment Video

Updated: Jul 2, 2026

Understanding the Changes in Mitochondrial Morphology through Dynamic and Three-dimensional Fluorescence Micrographs
08:15

Understanding the Changes in Mitochondrial Morphology through Dynamic and Three-dimensional Fluorescence Micrographs

Published on: August 15, 2025

Positioning mitochondrial plasticity within cellular signaling cascades.

Vincent Soubannier1, Heidi M McBride

  • 1University of Ottawa Heart Institute, 40 Ruskin Street, Ottawa, ON, Canada K1Y 4W7.

Biochimica Et Biophysica Acta
|August 13, 2008
PubMed
Summary

Mitochondrial dynamics, including fusion and fission, are crucial for cellular energy production. Molecular switches and cellular signals regulate mitochondrial shape, impacting function.

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Assessment of Mitochondrial Fission/Fusion Dynamics in Kidney Proximal Tubular Cells
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Assessment of Mitochondrial Fission/Fusion Dynamics in Kidney Proximal Tubular Cells

Published on: November 14, 2025

Related Experiment Videos

Last Updated: Jul 2, 2026

Understanding the Changes in Mitochondrial Morphology through Dynamic and Three-dimensional Fluorescence Micrographs
08:15

Understanding the Changes in Mitochondrial Morphology through Dynamic and Three-dimensional Fluorescence Micrographs

Published on: August 15, 2025

Assessment of Mitochondrial Fission/Fusion Dynamics in Kidney Proximal Tubular Cells
06:14

Assessment of Mitochondrial Fission/Fusion Dynamics in Kidney Proximal Tubular Cells

Published on: November 14, 2025

Area of Science:

  • Cell Biology
  • Mitochondrial Biology

Background:

  • Mitochondria, originating from endosymbiotic alpha-proteobacteria, possess a double membrane with four compartments.
  • The inner mitochondrial membrane's cristae house the respiratory chain and ATP synthase, vital for cellular energy via oxidative phosphorylation.
  • Historically viewed as static, mitochondria are now understood as a dynamic reticulum undergoing continuous fusion and fission.

Purpose of the Study:

  • To review the molecular mechanisms regulating mitochondrial dynamics.
  • To explore how cellular signals integrate with mitochondrial morphology.
  • To understand the impact of mitochondrial shape on cellular function.

Main Methods:

  • Literature review of recent imaging studies and genetic screens.
  • Analysis of post-translational modifications (PTMs) affecting mitochondrial morphology.
  • Integration of signaling pathways influencing mitochondrial dynamics.

Main Results:

  • Mitochondrial fusion, fission, and motility are governed by complex molecular machineries.
  • Metabolic and cellular signals dynamically regulate mitochondrial shape.
  • Post-translational modifications (e.g., phosphorylation, ubiquitination) are key regulators of mitochondrial morphology.
  • Changes in mitochondrial morphology significantly impact cellular function and energy output.

Conclusions:

  • Mitochondrial dynamics are essential for cellular homeostasis and energy production.
  • Understanding the molecular switches controlling mitochondrial shape is critical for deciphering cellular signaling.
  • Mitochondrial morphology is intricately linked to cellular signaling cascades, influencing overall cell function.