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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,...

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...

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,...

The Electron Transport Chain

The Electron Transport Chain

The electron transport chain or oxidative phosphorylation is an exothermic process in which free energy released during electron transfer reactions is coupled to ATP synthesis. This process is a significant source of energy in aerobic cells, and therefore inhibitors of the electron transport chain can be detrimental to the cell's metabolic processes.
Inhibitors of the electron transport chain
Rotenone, a widely used pesticide, prevents electron transfer from Fe-S cluster to ubiquinone or Q...

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: Oct 2, 2025

Phosphorus-31 Magnetic Resonance Spectroscopy: A Tool for Measuring In Vivo Mitochondrial Oxidative Phosphorylation Capacity in Human Skeletal Muscle

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Published on: January 19, 2017

Impaired Mitochondrial Bioenergetics under Pathological Conditions.

Salvatore Nesci¹, Giorgio Lenaz²

¹Department of Veterinary Medical Sciences, Alma Mater Studiorum University of Bologna, Via Tolara di Sopra, 50, 40064 Ozzano Emilia, BO, Italy.

Life (Basel, Switzerland)

|February 25, 2022

Summary

Mitochondria are vital cell powerhouses. Their dysfunction leads to energy loss and cell death in many diseases, impacting cellular health.

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Area of Science:

Cellular Biology
Mitochondrial Research
Disease Mechanisms

Background:

Mitochondria generate cellular energy (ATP).
Mitochondrial dysfunction is implicated in numerous pathologies.
Cellular energy depletion is a hallmark of disease.

Discussion:

Investigating the role of mitochondria in disease pathogenesis.
Understanding the link between mitochondrial function and cell viability.
Exploring therapeutic targets for mitochondrial dysfunction.

Key Insights:

Mitochondrial dysfunction directly causes energy deficits.
Cell death pathways are activated by impaired mitochondrial activity.
Mitochondrial health is crucial for overall organismal well-being.

Outlook:

Developing novel strategies to restore mitochondrial function.
Targeting mitochondrial pathways for disease treatment.
Advancing research in mitochondrial medicine and bioenergetics.