GO:1901612 cardiolipin binding: Mechanism, Genes and Research Methods
Research-grade guide for scientists and biopharma professionals
Key Takeaways
• GO:1901612 cardiolipin binding is a molecular function defined as binding to cardiolipin, a unique dimeric phospholipid of mitochondrial and bacterial membranes.
• Cardiolipin binding is essential for the assembly and function of respiratory chain complexes in bacteria and mitochondria.
• Cytochrome c binds cardiolipin in a curvature-dependent manner, a key step in the initiation of apoptosis.
• Cardiolipin binding proteins include cytochrome c oxidase, cytochrome c, OPA1, LC3/GABARAP, and bacterial respiratory complexes.
• Dysregulation of cardiolipin binding is linked to mitochondrial dysfunction, neurodegeneration, and cancer.
• CRISPR knockout, point mutation, knock-in, and overexpression models are powerful tools to dissect cardiolipin binding in health and disease.
Description
Cardiolipin is a unique dimeric phospholipid found primarily in the inner mitochondrial membrane and bacterial plasma membrane. The binding of proteins to cardiolipin, defined by the Gene Ontology term GO:1901612 cardiolipin binding, is a molecular function that underpins diverse cellular processes, from energy production to apoptosis. This function is critical for the structural and functional integrity of respiratory complexes, as cardiolipin acts as a scaffold and cofactor for their assembly and activity. Researchers study cardiolipin binding to understand mitochondrial physiology and its implications in disease. For example, cytochrome c binding to cardiolipin is a prerequisite for its pro-apoptotic function, and this interaction is sensitive to membrane curvature and ionic strength. Similarly, cardiolipin binding by OPA1 is essential for mitochondrial membrane remodeling and fusion. The specificity and regulation of cardiolipin binding are therefore central to mitochondrial and bacterial cell biology. This article provides a comprehensive overview of the molecular mechanism, key genes, disease associations, and research methods for studying cardiolipin binding, based on authoritative QuickGO data and verified PubMed literature.
cardiolipin binding At A Glance
| GO ID | GO:1901612 |
|---|---|
| GO term | cardiolipin binding |
| Ontology | molecular_function |
| Synonym | none |
| Major function | Binding to cardiolipin, a mitochondrial and bacterial phospholipid |
| Definition | Binding to cardiolipin. |
| Related processes | Respiratory chain assembly, apoptosis, membrane remodeling, autophagy |
| Key proteins | Cytochrome c, cytochrome c oxidase, OPA1, LC3/GABARAP, bacterial respiratory complexes |
What Is GO:1901612?
GO:1901612 cardiolipin binding is a molecular function term that describes the selective interaction of a protein or other molecule with cardiolipin, a phospholipid characterized by a dimeric structure with four acyl chains and two phosphate groups. This binding event can be structural, regulatory, or catalytic, and it often occurs at membrane interfaces where cardiolipin is enriched.
Why Is cardiolipin binding Important in Cell Biology?
Cardiolipin binding is fundamental to mitochondrial and bacterial bioenergetics and signaling. It ensures the proper assembly and function of respiratory chain complexes, regulates apoptosis, and maintains membrane dynamics. Defects in cardiolipin binding are associated with severe pathologies, including neurodegeneration and cancer, making it a critical area of biomedical research.
• Essential for the structural integrity and activity of respiratory chain complexes I, III, and IV.
• Required for cytochrome c-mediated apoptosis, a key tumor suppression mechanism.
• Regulates mitochondrial membrane remodeling and fusion through OPA1.
• Involved in autophagy via LC3/GABARAP proteins.
• Targeted by antimicrobial peptides such as sphingosine.
• Dysregulated in neurodegenerative disorders like optic atrophy.
• Implicated in cancer cell survival and chemoresistance.
• Provides a docking site for proteins at membrane curvature.
• Modulated by ionic strength and lipid composition.
• Potential therapeutic target for mitochondrial diseases.
Molecular Mechanism of cardiolipin binding
Cardiolipin structure and membrane organization
In simple terms: Cardiolipin is a special fat molecule in membranes that has a unique shape, allowing it to interact with proteins.
Cardiolipin is a dimeric phospholipid with four acyl chains, giving it a conical shape that promotes membrane curvature and protein recruitment. It is predominantly found in the inner mitochondrial membrane and bacterial plasma membrane, where it forms microdomains.
Binding by respiratory complexes
In simple terms: Proteins in the energy-producing machinery grab onto cardiolipin to work properly.
Cytochrome c oxidase (COX) binds cardiolipin at specific sites, which is required for its catalytic activity and stability. Bacterial respiratory complexes also rely on cardiolipin binding for assembly and function.
Cytochrome c-cardiolipin interaction
In simple terms: A protein called cytochrome c sticks to cardiolipin, which changes its shape and triggers cell death.
Cytochrome c binds cardiolipin via electrostatic and hydrophobic interactions, leading to a conformational change that confers peroxidase activity, essential for apoptosis. This binding is curvature-dependent and sensitive to ionic strength.
Regulation by lipid environment and curvature
In simple terms: The way cardiolipin is packed in the membrane affects how proteins bind to it.
Membrane curvature and lipid composition modulate cardiolipin binding; for instance, cytochrome c binds preferentially to curved membranes. Ceramide enhances the binding of LC3/GABARAP to cardiolipin-containing membranes, linking lipid metabolism to autophagy.
Role in membrane remodeling
In simple terms: Cardiolipin helps proteins reshape mitochondria.
OPA1 binds cardiolipin to promote mitochondrial inner membrane fusion and cristae remodeling. This interaction is dynamic and essential for mitochondrial morphology.
Key Genes Involved in GO:1901612 cardiolipin binding
The following genes and proteins are key players in cardiolipin binding, as supported by published literature.
| Gene | Major Role | Research Relevance |
|---|---|---|
| CYCS | Cytochrome c binds cardiolipin to initiate apoptosis | Apoptosis regulation, cancer therapy |
| COX4I1 | Cytochrome c oxidase subunit binds cardiolipin for activity | Mitochondrial respiratory chain |
| OPA1 | Binds cardiolipin for membrane remodeling | Mitochondrial dynamics, neurodegeneration |
| MAP1LC3B | LC3 binds cardiolipin-containing membranes in autophagy | Autophagy, lipid signaling |
| GABARAP | GABARAP binds cardiolipin for autophagosome formation | Autophagy |
| NDUFA4 | Respiratory complex I subunit interacts with cardiolipin | Respiratory chain assembly |
| UQCRC1 | Complex III subunit binds cardiolipin | Respiratory chain |
| ATP5F1A | ATP synthase binds cardiolipin | Bioenergetics |
| IMMT | Mitochondrial inner membrane protein binds cardiolipin | Membrane organization |
| PHB2 | Prohibitin binds cardiolipin | Mitochondrial stability |
| DNM1L | Drp1 interacts with cardiolipin during fission | Mitochondrial fission |
| MFN1 | Mitofusin binds cardiolipin | Mitochondrial fusion |
| VDAC1 | VDAC binds cardiolipin | Metabolic regulation |
| ANT1 | Adenine nucleotide translocator binds cardiolipin | Mitochondrial transport |
| BID | Bid binds cardiolipin to promote apoptosis | Apoptosis |
| BAX | Bax interacts with cardiolipin | Apoptosis |
| SLC25A4 | Mitochondrial carrier binds cardiolipin | Metabolic regulation |
How Is cardiolipin binding Regulated?
Cardiolipin binding is regulated by factors such as membrane curvature, ionic strength, and lipid composition. For example, cytochrome c binding to cardiolipin is enhanced at curved membranes and modulated by salt concentration. Additionally, ceramide levels can enhance the binding of autophagy proteins to cardiolipin-containing membranes. These regulatory mechanisms ensure that cardiolipin binding is spatially and temporally controlled.
cardiolipin binding and Human Disease
| Gene | Disease / Biology | Potential Experimental Model |
|---|---|---|
| OPA1 | Optic atrophy, neurodegeneration | OPA1 knockout or point mutation in neurons |
| CYCS | Cancer, apoptosis resistance | CYCS knock-in of cardiolipin-binding mutants |
| MAP1LC3B | Autophagy-related disorders | LC3B knockout in cancer cells |
| COX4I1 | Mitochondrial myopathy | COX4I1 knockout in myotubes |
| GABARAP | Neurodegeneration | GABARAP knockout in neurons |
Neurodegeneration
Mutations in OPA1 that impair cardiolipin binding lead to optic atrophy and mitochondrial dysfunction, highlighting the role of cardiolipin binding in neurodegeneration.
Cancer
Cytochrome c-cardiolipin binding is a critical step in apoptosis; dysregulation of this interaction can promote cancer cell survival and chemoresistance.
Infectious diseases
Sphingosine kills bacteria by binding to cardiolipin, suggesting that cardiolipin binding is a target for antimicrobial strategies.
From cardiolipin binding-Related Genes to Experimental Models
| Research Question | Suitable Model |
|---|---|
| Does loss of cardiolipin binding affect respiratory chain function? | CRISPR knockout of COX4I1 or UQCRC1 in HeLa cells |
| How does a point mutation in the cardiolipin-binding site of cytochrome c affect apoptosis? | CRISPR point mutation knock-in of CYCS in cancer cell lines |
| Can overexpression of OPA1 rescue mitochondrial fusion defects? | OPA1 overexpression in patient-derived fibroblasts |
| What is the interactome of cardiolipin-binding proteins? | Knock-in of tagged cardiolipin-binding proteins followed by proteomics |
| Does cardiolipin binding regulate autophagy? | CRISPR knockout of MAP1LC3B in autophagy reporter cells |
| Can small molecules modulate cardiolipin binding? | High-throughput screening using cardiolipin-binding assays |
How to Study the cardiolipin binding Process
| Method | What It Measures | Typical Application |
|---|---|---|
| Liposome sedimentation | Direct protein-lipid binding | Quantify cardiolipin binding affinity |
| Surface plasmon resonance | Binding kinetics | Measure affinity and kinetics of cardiolipin binding |
| Cryo-EM | High-resolution structure | Visualize cardiolipin binding sites |
| Fluorescence microscopy | Cellular localization | Image cardiolipin-protein colocalization |
| CRISPR knockout screens | Gene essentiality | Identify regulators of cardiolipin binding |
| Proteomics | Protein interactions | Identify cardiolipin-binding proteins |
| Isothermal titration calorimetry | Thermodynamics of binding | Measure binding enthalpy and entropy |
Lipid binding assays
In vitro assays such as liposome sedimentation or surface plasmon resonance can measure direct binding of proteins to cardiolipin.
Structural biology
X-ray crystallography and cryo-EM reveal atomic details of cardiolipin binding sites in respiratory complexes and cytochrome c.
Cellular imaging
Fluorescence microscopy with cardiolipin-specific probes (e.g., NAO) and tagged proteins can visualize cardiolipin binding in live cells.
CRISPR screening
Genome-wide CRISPR knockout screens can identify genes required for cardiolipin binding and related processes.
How CRISPR Can Be Used to Study GO:1901612 cardiolipin binding
Knockout
CRISPR knockout of genes encoding cardiolipin-binding proteins (e.g., COX4I1, OPA1) can reveal their essential roles in mitochondrial function and apoptosis.
Point Mutation
Introducing point mutations in cardiolipin-binding sites (e.g., in CYCS) allows precise dissection of binding residues and their functional consequences.
Knock-in
Knock-in of tagged or mutant versions of cardiolipin-binding proteins enables live-cell imaging and proteomic analysis.
Overexpression
Overexpression of cardiolipin-binding proteins such as OPA1 can rescue defects or induce specific phenotypes, useful for gain-of-function studies.
How EDITGENE Supports cardiolipin binding Research
Researchers studying cardiolipin binding-related genes often need to determine whether a candidate gene is causally involved in mitochondrial function, apoptosis, or membrane dynamics. EDITGENE provides a comprehensive suite of CRISPR services to accelerate this research.
Contact EDITGENE today to design your custom CRISPR model for cardiolipin binding research.
Frequently Asked Questions About cardiolipin binding
What is cardiolipin binding?
Cardiolipin binding is a molecular function (GO:1901612) where a protein or molecule selectively interacts with cardiolipin, a mitochondrial and bacterial phospholipid.
What genes are involved in cardiolipin binding?
Key genes include CYCS, COX4I1, OPA1, MAP1LC3B, and GABARAP, among others.
Why is cardiolipin binding important?
It is essential for respiratory chain function, apoptosis, and membrane remodeling, and its dysregulation is linked to neurodegeneration and cancer.
How is cardiolipin binding studied?
Methods include liposome sedimentation, surface plasmon resonance, cryo-EM, fluorescence microscopy, and CRISPR screens.
What diseases are associated with cardiolipin binding defects?
Neurodegeneration (e.g., optic atrophy), cancer, and infectious diseases.
Can CRISPR be used to study cardiolipin binding?
Yes, CRISPR knockout, point mutation, knock-in, and overexpression models are widely used to dissect cardiolipin binding.
What is the role of cytochrome c in cardiolipin binding?
Cytochrome c binds cardiolipin to trigger apoptosis, and this interaction is curvature-dependent.
How does OPA1 interact with cardiolipin?
OPA1 binds cardiolipin to promote mitochondrial inner membrane fusion and cristae remodeling.
Is cardiolipin binding regulated by membrane curvature?
Yes, cytochrome c binding to cardiolipin is enhanced at curved membranes.
What are the synonyms for cardiolipin binding?
There are no synonyms for GO:1901612 cardiolipin binding.
Conclusion
Cardiolipin binding (GO:1901612) is a fundamental molecular function that governs mitochondrial and bacterial membrane biology. Its roles in respiration, apoptosis, and membrane dynamics make it a critical area of research. By leveraging CRISPR models and advanced methodologies, researchers can uncover new insights into cardiolipin binding and its implications in human disease.
References
- 1. Arias-Cartin R et al.. 2012. Cardiolipin binding in bacterial respiratory complexes: structural and functional implications.. Biochim Biophys Acta 1817(10):1937-49 PMID: 22561115
- 2. Elmer-Dixon MM et al.. 2020. Curvature-Dependent Binding of Cytochrome c to Cardiolipin.. J Am Chem Soc 142(46):19532-19539 PMID: 33156621
- 3. Verhaegh R et al.. 2020. Sphingosine kills bacteria by binding to cardiolipin.. J Biol Chem 295(22):7686-7696 PMID: 32327486
- 4. Robinson NC. 1993. Functional binding of cardiolipin to cytochrome c oxidase.. J Bioenerg Biomembr 25(2):153-63 PMID: 8389748
- 5. Thatavarthy S et al.. 2025. Cardiolipin dynamics promote membrane remodeling by mitochondrial OPA1.. Nat Commun 16(1):8685 PMID: 41027961
- 6. Frederick AK et al.. 2024. Binding of yeast and human cytochrome c to cardiolipin nanodiscs at physiological ionic strength.. J Inorg Biochem 260:112699 PMID: 39181020
- 7. Hough MA et al.. 2014. NO binding to the proapoptotic cytochrome c-cardiolipin complex.. Vitam Horm 96:193-209 PMID: 25189388
- 8. Varela YR et al.. 2022. Ceramide enhances binding of LC3/GABARAP autophagy proteins to cardiolipin-containing membranes.. Int J Biol Macromol 217:748-760 PMID: 35839958
