GO:0120009 intermembrane lipid transfer: Mechanism, Genes, Functions and Research Methods
Research-grade guide for scientists and biopharma professionals
Key Takeaways
• GO:0120009 intermembrane lipid transfer describes the energy-independent movement of lipid molecules through an aqueous phase from the outer leaflet of a donor membrane to the outer leaflet of an acceptor membrane.
• This process can occur spontaneously or be facilitated by lipid transfer proteins (LTPs), which are essential for maintaining membrane lipid asymmetry and composition.
• Key proteins involved include glycolipid transfer proteins (GLTPs) and other LTPs that specifically bind and shuttle lipids between membranes.
• Dysregulation of intermembrane lipid transfer is linked to neurological disorders such as VPS13A disease and Cohen syndrome, as well as metabolic and cardiovascular conditions.
• Studying this process requires advanced methods such as lipidomics, fluorescence-based lipid transfer assays, and CRISPR-based gene editing to dissect protein function.
• EDITGENE provides comprehensive CRISPR services, including knockout, point mutation, knock-in, and overexpression models, to investigate genes involved in intermembrane lipid transfer.
Description
Intermembrane lipid transfer (GO:0120009) is a fundamental biological process that ensures the correct distribution of lipids among cellular membranes. It involves the transport of lipid molecules through an aqueous phase from the outer leaflet of a donor membrane to the outer leaflet of an acceptor membrane, without requiring metabolic energy. This process is critical for maintaining membrane lipid asymmetry, which is essential for cell signaling, vesicle trafficking, and organelle function. Researchers study intermembrane lipid transfer to understand how cells regulate lipid homeostasis and how defects contribute to diseases such as neurodegeneration and cardiovascular disorders. The process can occur spontaneously, but in cells it is often mediated by lipid transfer proteins (LTPs) that accelerate and target lipid movement. These proteins are characterized by hydrophobic pockets that shield lipids from the aqueous environment, enabling their transfer between membranes. Given its broad impact on cellular physiology, intermembrane lipid transfer is a vibrant area of research with implications for development, immunity, and disease.
intermembrane lipid transfer At A Glance
| GO ID | GO:0120009 |
|---|---|
| GO term | intermembrane lipid transfer |
| Ontology | biological_process |
| Synonym | None |
| Major function | Transport of lipids between membranes via an aqueous phase, either spontaneously or mediated by lipid transfer proteins. |
| Energy requirement | Does not require metabolic energy. |
| Location | Between outer leaflets of donor and acceptor membranes. |
| Key proteins | Lipid transfer proteins (LTPs) such as glycolipid transfer proteins. |
| Disease relevance | Implicated in neurological disorders, cardiovascular disease, and metabolic syndromes. |
What Is GO:0120009?
According to the Gene Ontology, intermembrane lipid transfer (GO:0120009) is defined as the transport of lipids between membranes in which a lipid molecule is transported through an aqueous phase from the outer leaflet of a donor membrane to the outer leaflet of an acceptor membrane. This process does not require metabolic energy and can be either spontaneous or mediated by lipid transfer proteins (LTPs).
Why Is intermembrane lipid transfer Important in Cell Biology?
Intermembrane lipid transfer is essential for maintaining the unique lipid composition of cellular membranes, which underpins processes such as signal transduction, membrane trafficking, and organelle identity. Defects in this process can lead to aberrant lipid distribution, contributing to diseases including VPS13A disease, Cohen syndrome, and atherosclerosis. Understanding the molecular mechanisms of lipid transfer is therefore crucial for developing therapeutic strategies targeting lipid homeostasis.
• Maintains membrane lipid asymmetry, critical for cell signaling and vesicle trafficking.
• Facilitates the distribution of lipids synthesized in one organelle to others.
• Mediated by lipid transfer proteins that are conserved from yeast to humans.
• Dysregulation is linked to neurodegenerative disorders such as VPS13A disease.
• Mutations in lipid transfer proteins cause Cohen syndrome, characterized by developmental delay.
• Involved in cardiovascular disease; enhancing lipid transfer can regress atherosclerotic plaques.
• Plays a role in ferroptosis resistance via STARD7-mediated coenzyme Q transport.
• Targeted lipid transfer nanoshuttles show therapeutic potential for atherosclerosis.
• Provides a mechanism for rapid membrane remodeling without vesicular transport.
• Represents a druggable process for modulating lipid-related pathologies.
What Happens During intermembrane lipid transfer?
Lipid Recognition and Binding by LTPs
In simple terms: Lipid transfer proteins grab specific lipids from the membrane.
The first step in intermembrane lipid transfer involves the recognition and binding of a lipid molecule by a lipid transfer protein (LTP). LTPs possess a hydrophobic binding pocket that accommodates the lipid, shielding it from the aqueous environment. For example, glycolipid transfer proteins (GLTPs) specifically bind glycosphingolipids and mediate their transfer between membranes. This binding is highly specific and often regulated by membrane composition and curvature.
Aqueous Phase Transit
In simple terms: The protein carries the lipid through the water inside the cell.
After binding, the LTP-lipid complex diffuses through the aqueous phase to the acceptor membrane. This step does not require metabolic energy, as it relies on concentration gradients and protein-lipid interactions. The hydrophobic pocket of the LTP protects the lipid from the aqueous environment, allowing efficient transit. Spontaneous lipid transfer can also occur, albeit at much slower rates, without protein mediation.
Lipid Release and Membrane Insertion
In simple terms: The lipid is released into the target membrane.
Upon reaching the acceptor membrane, the LTP undergoes conformational changes that reduce its affinity for the lipid, facilitating its release into the outer leaflet of the acceptor membrane. The lipid then integrates into the membrane, contributing to the membrane's lipid composition. This step may be influenced by membrane lipid composition, curvature, and the presence of specific lipids that promote release.
Spontaneous Lipid Transfer
In simple terms: Lipids can also move between membranes on their own, but very slowly.
In addition to protein-mediated transfer, lipids can spontaneously transfer between membranes through the aqueous phase. This process is driven by the hydrophobic effect and occurs at rates that depend on the lipid's solubility in water and membrane properties. Spontaneous transfer is generally inefficient for most lipids but can be significant for those with higher aqueous solubility, such as cholesterol.
Key Genes Involved in GO:0120009 intermembrane lipid transfer
The following genes encode proteins that mediate or regulate intermembrane lipid transfer, as supported by published literature.
| Gene | Major Role | Research Relevance |
|---|---|---|
| GLTP | Glycolipid transfer protein; transfers glycosphingolipids between membranes. | Model for studying lipid specificity and transfer mechanisms. |
| VPS13A | Lipid transfer protein involved in membrane contact sites; mutations cause chorea-acanthocytosis. | Neurodegeneration research; knockout models. |
| VPS13B | Lipid transfer protein; mutations cause Cohen syndrome. | Developmental disorders; knockout and knock-in models. |
| VPS13D | Lipid transfer protein; mutations cause movement disorders. | Neurological disease modeling. |
| STARD7 | StAR-related lipid transfer domain protein 7; transports coenzyme Q and regulates ferroptosis. | Ferroptosis and mitochondrial function studies. |
| CERT | Ceramide transfer protein; transfers ceramide from ER to Golgi. | Sphingolipid metabolism and signaling. |
| FAPP2 | Phosphatidylinositol-4-phosphate adaptor protein 2; transfers glucosylceramide. | Glycolipid metabolism. |
| OSBP | Oxysterol-binding protein; transfers cholesterol and phosphatidylinositol 4-phosphate. | Cholesterol homeostasis and signaling. |
| NPC1 | Niemann-Pick C1; involved in cholesterol trafficking. | Lysosomal storage disorders. |
| NPC2 | Niemann-Pick C2; transfers cholesterol from lysosomes. | Cholesterol transport. |
| CETP | Cholesteryl ester transfer protein; transfers cholesteryl esters between lipoproteins. | Cardiovascular disease research. |
| PLTP | Phospholipid transfer protein; transfers phospholipids between lipoproteins. | Lipoprotein metabolism. |
| MIGA2 | Mitoguardin 2; lipid transfer at ER-mitochondria contact sites. | Mitochondrial dynamics. |
| VPS13C | Lipid transfer protein; mutations linked to Parkinson's disease. | Neurodegeneration. |
| GRAMD1A | Aster protein; transfers cholesterol at ER-plasma membrane contacts. | Cholesterol transport. |
| GRAMD1B | Aster protein; mediates cholesterol transfer. | Membrane contact sites. |
| GRAMD1C | Aster protein; involved in cholesterol transfer. | Lipid homeostasis. |
| ORP5 | Oxysterol-binding protein-related protein 5; transfers phosphatidylserine. | Phospholipid transport. |
How Is intermembrane lipid transfer Regulated?
Intermembrane lipid transfer is regulated at multiple levels. Lipid transfer proteins can be regulated by their expression levels, post-translational modifications, and interactions with membrane lipids such as phosphatidylinositol 4-phosphate. For instance, the activity of oxysterol-binding protein (OSBP) is controlled by phosphatidylinositol 4-phosphate levels and phosphorylation. Additionally, membrane contact sites serve as platforms for lipid transfer, and their formation is dynamically regulated by cellular signals. The process can also be influenced by metabolic state, as seen with STARD7-mediated coenzyme Q transport affecting ferroptosis resistance.
intermembrane lipid transfer and Human Disease
| Gene | Disease / Biology | Potential Experimental Model |
|---|---|---|
| VPS13A | VPS13A disease (chorea-acanthocytosis) | Knockout mouse or patient-derived iPSCs |
| VPS13B | Cohen syndrome | Knockout zebrafish or mouse models |
| VPS13D | VPS13D movement disorder | Drosophila or mouse knockout |
| STARD7 | Ferroptosis resistance and mitochondrial function | Knockout cell lines and overexpression models |
| CETP | Atherosclerosis and lipid metabolism | Transgenic mice or rabbit models |
Neurodegenerative Disorders
Mutations in lipid transfer proteins are associated with severe neurological disorders. VPS13A disease (chorea-acanthocytosis) is caused by mutations in VPS13A, leading to neurodegeneration. Similarly, VPS13D mutations cause a movement disorder with spasticity and ataxia. Cohen syndrome, caused by VPS13B mutations, features developmental delay and microcephaly. These disorders highlight the critical role of intermembrane lipid transfer in neuronal function and survival.
Cardiovascular Disease
Intermembrane lipid transfer is implicated in atherosclerosis. Cholesteryl ester transfer protein (CETP) and phospholipid transfer protein (PLTP) modulate lipoprotein metabolism and influence plaque formation. Recent studies have shown that targeted lipid transfer nanoshuttles can induce atherosclerotic plaque regression by enhancing lipid efflux. This suggests that modulating lipid transfer could be a therapeutic strategy for cardiovascular disease.
Metabolic and Ferroptosis-Related Conditions
STARD7-mediated transfer of coenzyme Q is essential for mitochondrial function and resistance to ferroptosis, a form of iron-dependent cell death. Dysregulation of this pathway can sensitize cells to oxidative stress and contribute to metabolic disorders. Understanding how lipid transfer proteins like STARD7 regulate ferroptosis may open new avenues for treating diseases characterized by oxidative damage.
From intermembrane lipid transfer-Related Genes to Experimental Models
| Research Question | Suitable Model |
|---|---|
| What is the role of VPS13A in neuronal lipid transfer? | VPS13A knockout mouse or iPSC-derived neurons |
| How does VPS13B mutation affect Golgi lipid homeostasis? | VPS13B knockout cell lines and patient fibroblasts |
| Can overexpression of GLTP enhance glycolipid transfer? | GLTP overexpression in HeLa cells |
| Does STARD7 point mutation affect coenzyme Q transport? | STARD7 point-mutant knock-in cells |
| What is the impact of CETP inhibition on plaque regression? | CETP knockout or transgenic mice |
| How does VPS13D mutation lead to movement disorder? | VPS13D knockout Drosophila or mouse |
How to Study the intermembrane lipid transfer Process
| Method | What It Measures | Typical Application |
|---|---|---|
| FRET-based lipid transfer assay | Real-time lipid transfer between liposomes | Measuring LTP activity and specificity |
| Lipidomics (LC-MS) | Global lipid composition | Identifying lipid changes in knockout cells |
| Fluorescent lipid imaging | Intracellular lipid distribution and dynamics | Visualizing lipid transfer in live cells |
| CRISPR knockout screen | Genes required for lipid transfer | Discovering novel regulators |
| Co-immunoprecipitation | Protein-protein interactions | Identifying LTP complexes |
| Proximity ligation assay | Protein proximity at membrane contact sites | Detecting LTP localization |
| In vitro reconstitution | Minimal components for lipid transfer | Defining molecular requirements |
| Structural biology (cryo-EM, X-ray) | 3D structure of LTPs | Understanding lipid binding and transfer mechanism |
Lipid Transfer Assays
In vitro lipid transfer assays using fluorescently labeled lipids are widely used to measure the transfer activity of LTPs. These assays typically involve donor and acceptor liposomes or membranes, and the transfer is monitored by fluorescence resonance energy transfer (FRET) or fluorescence correlation spectroscopy. Such assays can determine lipid specificity, kinetics, and the effect of mutations.
Lipidomics and Mass Spectrometry
Mass spectrometry-based lipidomics allows comprehensive profiling of lipid species in cells and tissues. By comparing wild-type and mutant cells, researchers can identify changes in lipid composition resulting from altered intermembrane lipid transfer. This approach is powerful for uncovering the broader metabolic consequences of lipid transfer defects.
Imaging of Lipid Transfer
Live-cell imaging with fluorescent lipid analogs or genetically encoded lipid sensors can visualize lipid transfer in real time. For example, the transport of fluorescently labeled glycosphingolipids can be tracked in cells expressing GLTP. Advanced techniques such as super-resolution microscopy and correlative light-electron microscopy provide detailed views of membrane contact sites where lipid transfer occurs.
CRISPR-Based Genetic Screens
CRISPR knockout screens can identify genes required for intermembrane lipid transfer. By using lipid-sensitive reporters or measuring lipid distribution, researchers can uncover novel regulators. Such screens have been instrumental in linking VPS13 family proteins to lipid transfer and disease.
How CRISPR Can Be Used to Study GO:0120009 intermembrane lipid transfer
Knockout
CRISPR knockout of genes encoding lipid transfer proteins, such as VPS13A or GLTP, allows researchers to study loss-of-function phenotypes. For example, VPS13A knockout cells exhibit altered lipid distribution and impaired membrane trafficking. Knockout models are essential for validating the role of specific LTPs in intermembrane lipid transfer and associated diseases.
Point Mutation
Introducing disease-associated point mutations into LTP genes using CRISPR base editing or homology-directed repair can reveal how specific amino acid changes affect lipid transfer activity. For instance, mutations in VPS13B found in Cohen syndrome can be modeled to understand their impact on protein function. Point mutation models are valuable for dissecting structure-function relationships.
Knock-in
Knock-in of tagged versions of LTPs (e.g., GFP or HA) enables visualization and purification of the proteins for interaction and localization studies. Tagged knock-in models of GLTP or OSBP allow tracking of lipid transfer in live cells. Additionally, knock-in of patient-specific mutations can create accurate disease models.
Overexpression
Overexpression of lipid transfer proteins, such as GLTP or STARD7, can enhance lipid transfer and reveal gain-of-function phenotypes. For example, overexpression of STARD7 increases coenzyme Q transport and confers ferroptosis resistance. Overexpression models are useful for studying the sufficiency of a protein to drive lipid transfer.
How EDITGENE Supports intermembrane lipid transfer Research
Researchers studying intermembrane lipid transfer-related genes often need to determine whether a candidate gene is causally involved in lipid homeostasis, membrane dynamics, or disease. EDITGENE provides a comprehensive suite of CRISPR-based services to generate precisely engineered cell models, enabling functional validation of genes implicated in GO:0120009.
Contact EDITGENE today to design your custom CRISPR model for intermembrane lipid transfer research.
Frequently Asked Questions About intermembrane lipid transfer
What is intermembrane lipid transfer?
Intermembrane lipid transfer (GO:0120009) is the transport of lipid molecules through an aqueous phase from the outer leaflet of a donor membrane to the outer leaflet of an acceptor membrane, either spontaneously or mediated by lipid transfer proteins.
What genes are involved in intermembrane lipid transfer?
Key genes include GLTP, VPS13A, VPS13B, VPS13D, STARD7, CERT, FAPP2, OSBP, and NPC1, among others.
How is intermembrane lipid transfer regulated?
It is regulated by protein expression, post-translational modifications, and interactions with membrane lipids such as phosphatidylinositol 4-phosphate, as well as by membrane contact sites.
What diseases are associated with defects in intermembrane lipid transfer?
Defects are linked to VPS13A disease, Cohen syndrome, VPS13D movement disorder, atherosclerosis, and ferroptosis-related conditions.
What methods are used to study intermembrane lipid transfer?
Common methods include FRET-based lipid transfer assays, lipidomics, fluorescent imaging, CRISPR screens, and structural biology.
Can CRISPR be used to study intermembrane lipid transfer?
Yes, CRISPR knockout, point mutation, knock-in, and overexpression models are powerful tools to dissect gene function in lipid transfer.
What is the role of glycolipid transfer proteins?
Glycolipid transfer proteins (GLTPs) specifically bind and transfer glycosphingolipids between membranes, contributing to glycolipid homeostasis.
How does STARD7 relate to ferroptosis?
STARD7 transports coenzyme Q, and its loss impairs mitochondrial function and increases sensitivity to ferroptosis.
What is the connection between lipid transfer and atherosclerosis?
Lipid transfer proteins like CETP and PLTP modulate lipoprotein metabolism, and enhancing lipid transfer can regress atherosclerotic plaques.
What are the key research methods for lipid transfer proteins?
Key methods include in vitro lipid transfer assays, live-cell imaging, lipidomics, and CRISPR-based genetic screens.
Conclusion
Intermembrane lipid transfer (GO:0120009) is a fundamental cellular process that ensures proper lipid distribution across membranes. Mediated by lipid transfer proteins, it impacts diverse physiological and pathological processes, from neurodegeneration to cardiovascular disease. Understanding its mechanisms offers opportunities for therapeutic intervention. EDITGENE provides essential CRISPR tools to accelerate research in this field, enabling precise genetic models for functional studies.
References
- 2. Adam MP et al.. 1993. VPS13A Disease.. PMID: 20301561
- 3. Adam MP et al.. 1993. Cohen Syndrome.. PMID: 20301655
- 4. Rueckert DG et al.. 1990. Lipid transfer proteins.. Chem Phys Lipids 56(1):1-20 PMID: 2091833
- 5. Adam MP et al.. 1993. VPS13D Movement Disorder.. PMID: 30789691
- 6. Brown RE et al.. 2007. Glycolipid transfer proteins.. Biochim Biophys Acta 1771(6):746-60 PMID: 17320476
- 7. Tang S et al.. 2026. Targeted Lipid Transfer Nanoshuttle via Lipid-Specific Transcytosis Induces Atherosclerotic Plaque Regression.. Adv Mater 38(4):e11606 PMID: 41099096
- 8. Deshwal S et al.. 2023. Mitochondria regulate intracellular coenzyme Q transport and ferroptotic resistance via STARD7.. Nat Cell Biol 25(2):246-257 PMID: 36658222
