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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,...

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,...

Animal Mitochondrial Genetics

Animal Mitochondrial Genetics

Among all the organelles in an animal cell, only mitochondria have their own independent genomes. Animal mitochondrial DNA is a double-stranded, closed-circular molecule with around 20,000 base pairs. Mitochondrial DNA is unique in that one of its two strands, the heavy, or H, -strand is guanine rich, whereas the complementary strand is cytosine rich and called the light, or L, -strand. Compared to nuclear DNA, mitochondrial DNA has a very low percentage of non-coding regions and is marked by...

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,...

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 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...

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Related Experiment Video

Updated: Jun 6, 2026

Two-Step Tag-Free Isolation of Mitochondria for Improved Protein Discovery and Quantification

Two-Step Tag-Free Isolation of Mitochondria for Improved Protein Discovery and Quantification

Published on: June 2, 2023

Time to recognise that mitochondria are bacteria?

Mark J Pallen¹

¹Centre for Systems Biology, School of Biosciences, University of Birmingham, Birmingham, B15 2TT, UK. m.pallen@bham.ac.uk

Trends in Microbiology

|December 3, 2010

Summary

Mitochondria are descendants of bacteria, but should they be taxonomically classified as such? This exploration delves into the implications of treating mitochondria as bacteria for trauma response and transgenic applications.

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Two-Step Tag-Free Isolation of Mitochondria for Improved Protein Discovery and Quantification

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Isolation and Functional Analysis of Mitochondria from Cultured Cells and Mouse Tissue

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Mitochondrial Transformation in Baker's Yeast to Study Translation and Respiratory Complex Assembly

Mitochondrial Transformation in Baker's Yeast to Study Translation and Respiratory Complex Assembly

Published on: June 7, 2024

Area of Science:

Cell Biology
Evolutionary Biology
Microbiology

Background:

Mitochondria are widely accepted as bacterial endosymbionts.
Phylogenetic analysis supports the bacterial origin of mitochondria.

Purpose of the Study:

To explore the concept of 'phylogenetic fundamentalism' regarding mitochondria.
To examine the arguments for and against classifying mitochondria as bacteria (Mitochondriaceae).
To assess the impact of this classification on understanding trauma response and transgenic mitochondria.

Main Methods:

Conceptual exploration of phylogenetic arguments.
Review of existing literature on mitochondrial biology and bacterial classification.
Discussion of implications for systemic trauma and biotechnology.

Main Results:

The paper presents a playful yet rigorous examination of mitochondrial taxonomy.
It highlights the potential benefits and drawbacks of strict phylogenetic classification.
The consequences for medical and biotechnological applications are considered.

Conclusions:

Reclassifying mitochondria as bacteria could offer new perspectives on cellular processes.
This perspective may influence research into systemic trauma and the development of novel therapies.
The debate underscores the dynamic nature of scientific classification and its practical implications.