Related Experiment Video
Updated: Jul 6, 2025
08:48
Author Spotlight: Decoding Mitochondrial Aging
Published on: June 30, 2023
3.9K
Mitochondrial Dynamics at Different Levels: From Cristae Dynamics to Interorganellar Cross Talk
Arun Kumar Kondadi1, Andreas S Reichert1
1Institute of Biochemistry and Molecular Biology I, Medical Faculty and University Hospital Düsseldorf, Heinrich Heine University Düsseldorf, Düsseldorf, Germany; email: kondadi@hhu.de, reichert@hhu.de.
Annual Review of Biophysics
|January 2, 2024
Summary
Mitochondria exhibit dynamic behaviors at multiple levels, including within individual organelles, between mitochondria, and with other cellular components. Coordinated mitochondrial dynamics are crucial for maintaining cell function and preventing disease.
Area of Science:
- Cell Biology
- Mitochondrial Biology
Background:
- Mitochondria are vital organelles involved in cellular functions like energy production, metabolism, and apoptosis.
- Mitochondrial dynamics, including fusion, fission, and interactions with other organelles, are critical for cellular health.
- Recent advances in super-resolution microscopy have revealed new insights into mitochondrial structure and dynamics.
Purpose of the Study:
- To review the multifaceted nature of mitochondrial dynamics.
- To discuss mitochondrial dynamics at three interconnected levels: intra-mitochondrial, inter-mitochondrial, and mitochondria-organelle interactions.
- To highlight the importance of coordinated mitochondrial dynamics in cellular function and disease prevention.
Main Methods:
- Literature review focusing on mitochondrial dynamics.
- Discussion of findings from advanced fluorescence super-resolution nanoscopy.
- Analysis of structural and functional dynamics of mitochondria.
Main Results:
- Mitochondria are highly dynamic, undergoing fusion and fission.
- Mitochondria interact dynamically with organelles like the endoplasmic reticulum, peroxisomes, and lipid droplets.
- Recent discoveries reveal dynamic remodeling of the mitochondrial cristae membrane.
Conclusions:
- Mitochondrial dynamics occur at intra-mitochondrial, inter-mitochondrial, and inter-organelle levels.
- These dynamics are functionally interconnected and require coordination.
- Proper mitochondrial dynamics are essential for maintaining cellular homeostasis and preventing human diseases.
Related Concept Videos
01:45Mitochondrial Membranes
10.5K
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,...
10.5K
01:28The Inner Mitochondrial Membrane
3.4K
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...
3.4K
01:19Translocation of Proteins into the Mitochondria
3.1K
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,...
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,...
3.1K
01:28Electron Transport Chains
98.5K
The final stage of cellular respiration is oxidative phosphorylation that consists of two steps: the electron transport chain and chemiosmosis. The electron transport chain is a set of proteins found in the inner mitochondrial membrane in eukaryotic cells. Its primary function is to establish a proton gradient that can be used during chemiosmosis to produce ATP and generate electron carriers, such as NAD+ and FAD, that are used in glycolysis and the citric acid cycle.
The ETC is comprised of...
The ETC is comprised of...
98.5K
01:41The Supercomplexes in the Crista Membrane
2.5K
The mitochondrial cristae membrane is the primary site for the oxidative phosphorylation (OXPHOS) process of energy conversion mediated through respiratory complexes I to V. These complexes have been widely studied for decades, and it has been proven that they form supramolecular structures called respiratory supercomplexes (SC). These higher-order complexes may be crucial in maintaining the biochemical structure and improving the physiological activity of the individual complexes while...
2.5K
01:39Mitochondrial Protein Sorting
4.3K
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...
Most of these mitochondrial proteins are encoded by the nucleus and imported to the mitochondria as unfolded or loosely folded precursors. Mitochondrial precursors...
4.3K