Related Experiment Video
Updated: Aug 4, 2025
08:29
Analyses of Mitochondrial Calcium Influx in Isolated Mitochondria and Cultured Cells
Published on: April 27, 2018
13.9K
The mitochondrial calcium uniporter complex-A play in five acts
Agnese De Mario1, Donato D'Angelo1, Giuseppe Zanotti1
1Department of Biomedical Sciences, University of Padua, 35131, Padua, Italy.
Cell Calcium
|March 31, 2023
Summary
Mitochondrial calcium uptake regulates cell metabolism and ATP production. The mitochondrial calcium uniporter complex (MCUC) structure and function are revealed by Cryo-EM, clarifying calcium transport regulation.
Area of Science:
- Cellular Biology
- Mitochondrial Physiology
- Biochemistry
Background:
- Mitochondrial calcium (Ca2+) uptake influences cellular energy production and calcium homeostasis.
- Dysregulated mitochondrial Ca2+ can lead to cell death pathways.
- The mitochondrial calcium uniporter complex (MCUC) mediates Ca2+ influx into mitochondria.
Purpose of the Study:
- To elucidate the structural basis of MCUC assembly and function.
- To understand the role of critical residues in regulating Ca2+ transport.
- To provide insights into the physiological and pathological roles of mitochondrial Ca2+.
Main Methods:
- Cryogenic electron microscopy (Cryo-EM) for structural determination.
- X-ray crystallography to resolve atomic details.
- Biochemical assays to assess Ca2+ conductance.
Main Results:
- Cryo-EM and crystal structures revealed the precise assembly of the MCUC.
- Identified critical residues essential for regulating Ca2+ transport across the inner mitochondrial membrane.
- Confirmed the role of MCUC in mediating mitochondrial Ca2+ uptake.
Conclusions:
- The structural insights into MCUC provide a foundation for understanding mitochondrial Ca2+ regulation.
- This knowledge is crucial for deciphering the involvement of MCUC in cellular metabolism and disease.
- Further research can target MCUC for therapeutic interventions related to mitochondrial dysfunction.
More Related Videos
Related Concept Videos
01:46Electron Transport Chain: Complex I and II
14.7K
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...
ROS generation is regulated and maintained at moderate levels necessary...
14.7K
01:39Mitochondrial Protein Sorting
4.4K
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...
4.4K
01:28The Inner Mitochondrial Membrane
3.5K
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...
3.5K
01:34Protein Transport into the Inner Mitochondrial Membrane
4.0K
Nuclear encoded mitochondrial precursors are imported to the inner membrane in a multistep process involving two separate translocons, TIM22 and TIM23. TIM23 is a cation-selective pore that remains closed by the N terminal segment of the protein. Negative charges on the TIM23 act as a receptor for the incoming precursor, pulling the positively charged matrix-targeting sequence for peptide insertion and translocation.
Transport of mitochondrial precursors across the TIM23 channel is driven by...
Transport of mitochondrial precursors across the TIM23 channel is driven by...
4.0K
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
01:42The ADP/ATP Carrier Protein
3.3K
ADP/ATP carrier or AAC protein is the most abundant carrier protein in the inner mitochondrial membrane. It transports large quantities of ADP and ATP, equivalent to the average human body weight, every day. Among other transporters, ACC protein is one of the best-studied members of the mitochondrial carrier protein family. The ADP/ATP carrier protein comprises two transmembrane helices connected to a loop and a single alpha-helix on the matrix side. It switches between two conformational...
3.3K