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Mitochondrial Membranes

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 Membranes

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,...

Electron Transport Chain: Complex I and II

Electron Transport Chain: Complex I and II

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.
ROS generation is regulated and maintained at moderate levels necessary...

Mitochondria

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,...

The Inner Mitochondrial Membrane

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...

Translocation of Proteins into the Mitochondria

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,...

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Related Experiment Video

Updated: Jun 4, 2026

Transmitochondrial Cybrid Generation Using Cancer Cell Lines

Transmitochondrial Cybrid Generation Using Cancer Cell Lines

Published on: March 17, 2023

Cancer as a window into mitochondrial biology.

Thomas MacVicar¹, Laura C Greaves², Payam A Gammage¹

¹Cancer Research UK Scotland Institute, Glasgow, UK; School of Cancer Sciences, College of Medical, Veterinary, and Life Sciences, University of Glasgow, Glasgow, UK.

Cell Metabolism

|June 2, 2026

Summary

This summary is machine-generated.

Cancer research shows mitochondria are highly adaptable, not static. Understanding these dynamic mitochondrial behaviors offers new avenues for cancer treatment and other diseases.

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Area of Science:

Mitochondrial biology
Cancer research
Cellular plasticity

Background:

Mitochondria were traditionally viewed as static cellular components.
Emerging evidence suggests mitochondria possess significant dynamic capabilities.
Cancer biology has been instrumental in uncovering these mitochondrial behaviors.

Purpose of the Study:

To introduce key mitochondrial behaviors revealed through cancer research.
To highlight the plasticity of mitochondria as an organelle.
To propose future research directions in mitochondrial biology for oncology.

Main Methods:

Review of cancer research findings related to mitochondrial function.
Analysis of documented mitochondrial dynamics and behaviors.
Synthesis of information on mitochondrial plasticity.

Main Results:

Mitochondria exhibit remarkable plasticity and dynamic behaviors.
Cancer research has illuminated fundamental aspects of mitochondrial adaptability.
Specific mitochondrial behaviors have been identified and characterized.

Conclusions:

Mitochondrial plasticity is a key area for further investigation.
Understanding mitochondrial dynamics holds significant promise for cancer therapy.
Insights from mitochondrial biology extend beyond oncology, impacting broader biological research.