Related Experiment Video
Updated: Jan 16, 2026
10:31
A Model Membrane Platform for Reconstituting Mitochondrial Membrane Dynamics
Published on: September 2, 2020
8.0K
Cardiolipin dynamics promote membrane remodeling by mitochondrial OPA1
Sirikrishna Thatavarthy1, Luciano A Abriata2,3,4, Fernando Teixeira Pinto Meireles2,4
1Department of Molecular Pathobiology, College of Dentistry, New York University, New York, NY, USA.
Nature Communications
|September 30, 2025
Summary
Cardiolipin interacts with the OPA1 protein to shape mitochondria. Altered cardiolipin levels, seen in Barth syndrome, disrupt mitochondrial remodeling and function.
Area of Science:
- Mitochondrial biology
- Membrane biophysics
- Molecular dynamics
Background:
- Cardiolipin is crucial for mitochondrial structure and function.
- Its role in regulating mitochondrial morphology via protein interactions is unclear.
Purpose of the Study:
- To elucidate the molecular mechanisms of cardiolipin in mitochondrial remodeling.
- To investigate cardiolipin's interaction with the OPA1 fusion protein.
Main Methods:
- Molecular dynamics simulations to study cardiolipin-OPA1 interactions.
- Bromine-labeled cardiolipin probes for cryo-EM.
- Lipid bilayer composition analysis.
Main Results:
- Cardiolipin extensively binds to the OPA1 paddle domain at conserved motifs.
- Cryo-EM revealed cardiolipin enrichment in OPA1-bound leaflets.
- Reduced OPA1 membrane remodeling activity with increased monolyso-cardiolipin.
Conclusions:
- Cardiolipin directly influences OPA1-mediated membrane shaping.
- Monolyso-cardiolipin accumulation impairs mitochondrial remodeling, potentially explaining Barth syndrome.
- This provides insights into cardiolipin's role in mitochondrial homeostasis.
More Related Videos
Related Concept Videos
01:45Mitochondrial Membranes
16.6K
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,...
16.6K
01:28The Inner Mitochondrial Membrane
4.5K
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...
4.5K
01:28Assembly of the Lipid Bilayer in the ER
4.0K
Biological membranes are more than just a barrier separating cell cytoplasm from the outside environment. They are highly dynamic and help maintain the integrity and physiological stability of the cells as well as membrane-bound organelles. Membranes also play vital roles in cell-to-cell and intracellular communication.
A large chunk of any biological membrane is composed of phospholipids. These lipids have a heterogeneous distribution across different subcellular organelles and even between...
A large chunk of any biological membrane is composed of phospholipids. These lipids have a heterogeneous distribution across different subcellular organelles and even between...
4.0K
01:21Structure of Porins
3.8K
Mitochondria, chloroplasts, and gram-negative bacteria have transmembrane, beta-barrel proteins called porins to mediate the free diffusion of ions and metabolites across the membrane. Mitochondrial porin precursors contain conserved amino acid sequences called beta signals at their C-terminal. Beta signals have a motif of PoXGXXHyXHy (Po-Polar, X-Any amino acid, G-Glycine, Hy-LargeHydrophobic), which are crucial for precursor recognition to initiate precursor assembly. Beta-barrel...
3.8K
01:12Porin Insertion in the Outer Mitochondrial Membrane
4.6K
Porins are beta-barrel proteins translocated to the mitochondrial outer membrane through the TOM complex into the intermembrane space. Porin precursors bind TIM chaperones within the intermembrane space and are guided to the Sorting and Assembly Machinery complex or SAM complex on the outer mitochondrial membrane.
Three models describe the assembly of porins by the SAM complex and their insertion into the outer membrane. Model 1 suggests that porins are assembled outside the SAM channel as the...
Three models describe the assembly of porins by the SAM complex and their insertion into the outer membrane. Model 1 suggests that porins are assembled outside the SAM channel as the...
4.6K
01:25Lipid Catabolism
857
Triglycerides serve as crucial long-term energy storage molecules in microorganisms, providing a dense source of metabolic energy. Their breakdown is mediated by lipases, which hydrolyze triglycerides into glycerol and free fatty acids. Each of these components follows distinct metabolic pathways, ultimately contributing to ATP synthesis and cellular energy homeostasis.Glycerol MetabolismGlycerol, released from triglyceride hydrolysis, is phosphorylated by glycerol kinase to form...
857