GO:0046338 phosphatidylethanolamine catabolic process: Lipid Turnover Pathway, Genes, Functions and Research Methods
Research-grade guide for scientists and biopharma professionals
Key Takeaways
• GO:0046338 describes the biochemical breakdown of phosphatidylethanolamine (PE), a major glycerophospholipid in mammalian membranes.
• PE catabolism is essential for membrane remodeling, mitochondrial function, and cellular lipid homeostasis.
• The ferroptosis regulator GPX4 protects against oxidative PE degradation, and its inactivation triggers acute renal failure in mice.
• PE catabolic pathways intersect with autophagy, as ATG8 conjugation to phosphatidylserine requires PE-derived intermediates.
• Disrupted PE metabolism is linked to cardiovascular disease, including abdominal aortic aneurysm and peripheral artery disease.
• CRISPR knockout, knock-in, and overexpression models enable precise dissection of PE catabolic enzymes in disease contexts.
Description
Phosphatidylethanolamine (PE) is the second most abundant glycerophospholipid in mammalian cells and a key structural component of biological membranes. The catabolic process of PE, annotated as GO:0046338, encompasses the enzymatic reactions that degrade PE into its constituent parts, thereby regulating membrane lipid composition and generating signaling molecules. This process is critical for maintaining cellular lipid homeostasis and responding to metabolic stress. Research has shown that PE catabolism is tightly linked to mitochondrial function and intracellular phospholipid trafficking. For example, intramitochondrial phospholipid trafficking ensures proper distribution of PE and its catabolic products, influencing energy metabolism and organelle integrity. Moreover, age-associated reduction in ER-mitochondrial contacts impairs mitochondrial lipid metabolism, including PE turnover, and affects autophagosome formation in the heart. These findings underscore the importance of PE catabolism in aging and cardiovascular health. The ferroptosis regulator GPX4 is a central enzyme in protecting against oxidative PE degradation; its inactivation leads to acute renal failure in mice, highlighting the physiological significance of PE catabolism in disease. Additionally, non-canonical autophagy drives alternative ATG8 conjugation to phosphatidylserine, a process that intersects with PE metabolism and membrane dynamics. Given its broad impact, understanding PE catabolic processes offers insights into membrane biology, cell death, and metabolic disorders.
phosphatidylethanolamine catabolic process At A Glance
| GO ID | GO:0046338 |
|---|---|
| GO term | phosphatidylethanolamine catabolic process |
| Ontology | biological_process |
| Synonym | phosphatidylethanolamine breakdown; phosphatidylethanolamine catabolism; phosphatidylethanolamine degradation |
| Major function | Breakdown of phosphatidylethanolamine for membrane remodeling, lipid signaling, and energy homeostasis |
| Related pathways | Phospholipid metabolism, ferroptosis, autophagy, mitochondrial lipid trafficking |
| Key enzymes | GPX4, phospholipases, lysophospholipases, and other lipases |
| Cellular location | Membranes (plasma, mitochondrial, ER), cytosol, lysosomes |
What Is GO:0046338?
GO:0046338, phosphatidylethanolamine catabolic process, is defined as the chemical reactions and pathways resulting in the breakdown of phosphatidylethanolamine, a class of glycerophospholipids in which a phosphatidyl group is esterified to the hydroxyl group of ethanolamine. This process includes enzymatic hydrolysis and oxidative modifications that degrade PE into smaller metabolites, such as free fatty acids, glycerol, and ethanolamine derivatives, which can be further utilized or recycled by the cell.
Why Is phosphatidylethanolamine catabolic process Important in Cell Biology?
Phosphatidylethanolamine catabolic process is fundamental to cellular lipid homeostasis and membrane dynamics. It provides precursors for phospholipid remodeling and generates lipid second messengers that influence cell survival and death. Dysregulation of PE catabolism contributes to ferroptosis, a form of regulated cell death implicated in acute organ failure and neurodegeneration. Furthermore, PE catabolism is intertwined with mitochondrial function and autophagy, affecting energy production and cellular quality control. In cardiovascular disease, altered PE metabolism has been observed in abdominal aortic aneurysm and peripheral artery disease, suggesting its potential as a biomarker or therapeutic target. Thus, studying PE catabolism is essential for understanding metabolic disorders, aging, and cell death pathways.
• Maintains membrane phospholipid asymmetry and fluidity.
• Regulates ferroptosis through GPX4-mediated protection against oxidative PE degradation.
• Supports mitochondrial energy metabolism and organelle integrity.
• Influences autophagosome formation via ER-mitochondrial contacts.
• Contributes to cardiovascular pathology such as abdominal aortic aneurysm.
• Provides precursors for phosphatidylserine and other phospholipids.
• Modulates cellular responses to oxidative stress and aging.
• Potential target for therapeutic intervention in renal injury and metabolic diseases.
• Links lipid metabolism to antibiotic resistance and resource allocation in bacteria.
• Essential for normal brain and nervous system function due to high PE content in neuronal membranes.
What Happens During phosphatidylethanolamine catabolic process?
Initiation by Phospholipases
In simple terms: Enzymes called phospholipases start the breakdown of PE by cutting it into smaller pieces.
The catabolism of phosphatidylethanolamine begins with the action of phospholipases, such as phospholipase A2 (PLA2), which hydrolyze the acyl ester bonds at the sn-2 position, releasing free fatty acids and lysophosphatidylethanolamine (LPE). These enzymes are regulated by calcium and phosphorylation, and their activity is crucial for membrane remodeling and signaling. In mammalian cells, multiple PLA2 isoforms localize to different membranes, including the plasma membrane and mitochondria, ensuring compartmentalized PE turnover.
Oxidative Degradation and Ferroptosis
In simple terms: PE can be damaged by oxidation, and a protein called GPX4 protects it from this damage.
Phosphatidylethanolamine is particularly susceptible to oxidative modification by reactive oxygen species (ROS), leading to the formation of oxidized PE species. The enzyme glutathione peroxidase 4 (GPX4) reduces lipid peroxides, thereby preventing oxidative PE degradation and ferroptosis. Inactivation of GPX4 in mice triggers acute renal failure, demonstrating the lethal consequences of uncontrolled PE oxidation. This oxidative catabolic pathway is a key driver of ferroptotic cell death and is implicated in various pathologies.
Lysophospholipase and Further Hydrolysis
In simple terms: After the first cut, other enzymes continue to break down the remaining pieces.
Lysophosphatidylethanolamine (LPE) produced by PLA2 can be further hydrolyzed by lysophospholipases to yield glycerophosphoethanolamine and free fatty acids. These enzymes, including lysophospholipase A2, are integral to the complete catabolism of PE and the recycling of its components. The resulting ethanolamine can be phosphorylated and reused for PE synthesis or other metabolic pathways, linking catabolism to anabolism.
Mitochondrial PE Catabolism and Trafficking
In simple terms: Inside mitochondria, PE is broken down and moved around to support energy production.
Mitochondria are major sites of PE catabolism and trafficking. Intramitochondrial phospholipid trafficking ensures that PE and its catabolic intermediates are distributed to the inner membrane for cardiolipin synthesis and energy transduction. Disruption of ER-mitochondrial contacts, as seen in aging hearts, impairs mitochondrial lipid metabolism and reduces autophagosome formation, highlighting the interplay between PE catabolism and organelle communication.
Autophagy and ATG8 Conjugation
In simple terms: PE breakdown products help recycle cell components through autophagy.
PE is required for the conjugation of ATG8 family proteins to phosphatidylethanolamine during autophagy. Non-canonical autophagy can drive alternative ATG8 conjugation to phosphatidylserine, but canonical autophagy relies on PE as the lipid anchor for ATG8 lipidation. This process is essential for autophagosome formation and the degradation of cellular components, linking PE catabolism to protein and organelle turnover.
Key Genes Involved in GO:0046338 phosphatidylethanolamine catabolic process
The following genes and proteins are key players in phosphatidylethanolamine catabolic process, encompassing enzymes, transporters, and regulatory factors.
| Gene | Major Role | Research Relevance |
|---|---|---|
| GPX4 | Reduces lipid peroxides, preventing oxidative PE degradation | Ferroptosis regulation; knockout causes acute renal failure in mice |
| PLA2G6 | Phospholipase A2, hydrolyzes PE to LPE and free fatty acids | Mutations linked to neurodegeneration; model for PE catabolism |
| LPCAT3 | Lysophosphatidylcholine acyltransferase, remodels PE | Influences membrane composition and ferroptosis sensitivity |
| ATG8 (MAP1LC3B) | Conjugates to PE for autophagosome formation | Autophagy studies; non-canonical conjugation to PS |
| VPS34 | Phosphatidylinositol 3-kinase, regulates autophagy | Affects PE-dependent autophagosome biogenesis |
| PEMT | Phosphatidylethanolamine N-methyltransferase, synthesizes PC from PE | Links PE catabolism to PC synthesis |
| CEPT1 | Choline/ethanolamine phosphotransferase, synthesizes PE | Balances PE synthesis and catabolism |
| ABCA1 | Transports phospholipids including PE | Affects membrane lipid efflux and catabolism |
| LPGAT1 | Lysophosphatidylglycerol acyltransferase, remodels PE | Potential role in PE turnover |
| MBOAT7 | Lysophospholipid acyltransferase, remodels PE | Associated with liver disease and lipid metabolism |
| PLA2G4A | Cytosolic phospholipase A2, releases arachidonic acid from PE | Inflammation and signaling |
| PLA2G15 | Lysosomal phospholipase A2, degrades PE in lysosomes | Lysosomal lipid catabolism |
| LAMP2 | Lysosomal membrane protein, protects lysosomal PE | Lysosomal function and autophagy |
| TFEB | Transcription factor, regulates lysosomal and lipid catabolism | Master regulator of PE catabolic gene expression |
| SREBP1 | Transcription factor, controls lipogenic genes | Links PE catabolism to lipid homeostasis |
| PPARα | Nuclear receptor, regulates lipid oxidation | Influences PE catabolism in liver |
| CCTα | CCTα, regulates phosphatidylcholine synthesis | Interplay between PE and PC metabolism |
How Is phosphatidylethanolamine catabolic process Regulated?
Phosphatidylethanolamine catabolic process is regulated at multiple levels. Transcriptional control by TFEB and SREBP1 modulates the expression of lipases and autophagy-related genes, thereby influencing PE turnover. Post-translational modifications, such as phosphorylation of phospholipases, rapidly adjust enzymatic activity in response to cellular signals. The availability of substrates and cofactors, including calcium and ATP, also affects catabolic flux. Additionally, oxidative stress can trigger PE oxidation, which is counteracted by GPX4 and glutathione. In mitochondria, PE catabolism is coupled to energy status and ER-mitochondrial contact sites, which are modulated by aging and metabolic stress.
phosphatidylethanolamine catabolic process and Human Disease
| Gene | Disease / Biology | Potential Experimental Model |
|---|---|---|
| GPX4 | Ferroptosis, acute kidney injury | Gpx4 knockout mouse; renal ischemia-reperfusion model |
| PLA2G6 | Neurodegeneration with brain iron accumulation | PlA2g6 knockout mouse; neuronal cell lines |
| LPCAT3 | Ferroptosis sensitivity, atherosclerosis | Lpcat3 knockout mouse; lipidomic profiling |
| ATG8 | Autophagy-related disorders | ATG8 knockout cells; autophagy flux assays |
| TFEB | Lysosomal storage diseases, metabolic syndrome | TFEB overexpression/knockout models |
Ferroptosis and Acute Kidney Injury
GPX4 inactivation leads to uncontrolled oxidative degradation of phosphatidylethanolamine, triggering ferroptosis and acute renal failure in mice. This highlights the critical role of PE catabolism in kidney disease and the potential of GPX4 as a therapeutic target.
Cardiovascular Disease
Lipidomic profiling of abdominal aortic aneurysm and peripheral artery disease patients reveals altered PE metabolism, suggesting that dysregulated PE catabolism contributes to vascular pathology. Age-associated reduction in ER-mitochondrial contacts impairs mitochondrial PE metabolism in the heart, linking PE catabolism to cardiac aging and autophagy defects.
Neurodegeneration
Mutations in PLA2G6, a phospholipase involved in PE catabolism, cause neurodegeneration with brain iron accumulation, underscoring the importance of PE breakdown in neuronal health. Oxidative PE degradation and ferroptosis are also implicated in neurodegenerative diseases.
Metabolic and Infectious Diseases
PE catabolism influences resource allocation and antibiotic resistance in bacteria, as shown by metabolism-dependent succinylation. In humans, altered PE metabolism is linked to metabolic syndrome and liver diseases.
From phosphatidylethanolamine catabolic process-Related Genes to Experimental Models
| Research Question | Suitable Model |
|---|---|
| Does GPX4 protect against PE oxidation in vivo? | GPX4 knockout mouse (conditional) |
| What is the role of PLA2G6 in PE catabolism? | PLA2G6 point-mutation knock-in cells |
| How does PE catabolism affect autophagy? | ATG8 tagged knock-in cells; PE lipidomics |
| Can PE catabolism be targeted in cardiovascular disease? | ApoE knockout mouse with PE enzyme overexpression |
| What is the impact of PE catabolism on mitochondrial function? | Mitochondria-targeted PE probes; Seahorse assay |
| Does PE catabolism regulate antibiotic resistance? | Bacterial strains with succinylation mutations |
How to Study the phosphatidylethanolamine catabolic process Process
| Method | What It Measures | Typical Application |
|---|---|---|
| LC-MS/MS lipidomics | PE species and catabolic products | Quantifying PE degradation in disease models |
| Fluorescent PE analogs | PE trafficking and localization | Live-cell imaging of PE catabolism |
| CRISPR knockout screens | Genes required for PE catabolism | Identifying novel regulators of ferroptosis |
| Autophagy flux assay | LC3B lipidation and autophagosome formation | Linking PE catabolism to autophagy |
| Seahorse assay | Mitochondrial respiration | Assessing impact of PE catabolism on energy metabolism |
| Immunoblotting | Protein expression of PE catabolic enzymes | Validating knockout or overexpression |
| RNA-seq | Transcriptional changes in PE catabolic genes | Profiling regulatory networks |
| Proteomics | Post-translational modifications of PE enzymes | Identifying succinylation or phosphorylation |
Lipidomics and Mass Spectrometry
Liquid chromatography-tandem mass spectrometry (LC-MS/MS) enables comprehensive profiling of PE and its catabolic products, revealing changes in lipid species under different conditions. This method is essential for quantifying PE degradation and identifying oxidized PE species in ferroptosis.
Fluorescent PE Analogs and Imaging
Fluorescently labeled PE analogs, such as NBD-PE, allow real-time visualization of PE trafficking and catabolism in live cells using confocal microscopy. This approach helps track the subcellular localization of PE catabolic enzymes and their substrates.
CRISPR Screens and Genetic Perturbation
Genome-wide CRISPR knockout screens can identify genes required for PE catabolism and ferroptosis sensitivity. Follow-up validation with targeted knockouts or point mutations confirms specific roles of candidate genes.
Autophagy Flux Assays
Autophagy flux assays, including LC3B lipidation and ATG8 conjugation to PE, measure the impact of PE catabolism on autophagosome formation. These assays are crucial for linking PE breakdown to cellular degradation pathways.
How CRISPR Can Be Used to Study GO:0046338 phosphatidylethanolamine catabolic process
Knockout
CRISPR knockout of genes such as GPX4 or PLA2G6 enables the study of PE catabolism in loss-of-function models. For example, Gpx4 knockout mice develop acute renal failure due to uncontrolled PE oxidation, providing a robust in vivo model for ferroptosis research. Knockout cell lines are valuable for lipidomic and autophagy assays.
Point Mutation
Point mutations in PE catabolic enzymes, such as catalytic dead mutants of PLA2G6, allow precise dissection of enzymatic activity versus scaffolding functions. These models help distinguish between the catalytic and non-catalytic roles of PE catabolism in cellular processes.
Knock-in
Knock-in of tagged versions of PE catabolic enzymes, such as GFP-tagged ATG8, facilitates real-time imaging and proteomic analysis of PE conjugation and trafficking. Knock-in of disease-associated mutations, like those in PLA2G6, provides models for neurodegeneration.
Overexpression
Overexpression of PE catabolic enzymes, such as GPX4 or phospholipases, can protect cells from oxidative stress and ferroptosis, or conversely, promote PE degradation and membrane remodeling. Overexpression models are useful for gain-of-function studies and drug screening.
How EDITGENE Supports phosphatidylethanolamine catabolic process Research
Researchers studying phosphatidylethanolamine catabolic process-related genes often need to determine whether a candidate gene is causally involved in lipid metabolism, ferroptosis, or disease. EDITGENE provides comprehensive CRISPR-based services to generate precisely engineered cell and animal models, enabling rigorous functional validation.
Contact EDITGENE today to design your custom CRISPR model for phosphatidylethanolamine catabolic process research.
Frequently Asked Questions About phosphatidylethanolamine catabolic process
What is phosphatidylethanolamine catabolic process?
It is the biochemical breakdown of phosphatidylethanolamine (PE), a major membrane phospholipid, into smaller metabolites such as free fatty acids and ethanolamine, as defined by GO:0046338.
What genes are involved in phosphatidylethanolamine catabolic process?
Key genes include GPX4, PLA2G6, LPCAT3, ATG8, and various phospholipases and lysophospholipases that hydrolyze or oxidize PE.
How is phosphatidylethanolamine catabolism linked to ferroptosis?
GPX4 protects against oxidative PE degradation; its inactivation leads to lipid peroxidation and ferroptotic cell death, as shown in acute renal failure models.
What is the role of PE catabolism in autophagy?
PE is required for ATG8 conjugation during autophagosome formation; its breakdown products influence autophagic flux and membrane remodeling.
Which diseases are associated with abnormal PE catabolism?
Diseases include acute kidney injury, cardiovascular disease, neurodegeneration, and metabolic disorders.
How can I study phosphatidylethanolamine catabolic process in the lab?
Methods include lipidomics, fluorescent PE analogs, CRISPR screens, autophagy flux assays, and mitochondrial function assays.
What CRISPR models are available for PE catabolism research?
Knockout, point mutation, knock-in, and overexpression models for genes like GPX4, PLA2G6, and ATG8 can be generated.
What is the clinical significance of PE catabolism?
It is a potential therapeutic target for ferroptosis-related diseases, cardiovascular conditions, and neurodegeneration.
How does PE catabolism affect mitochondrial function?
PE catabolism and trafficking are essential for mitochondrial membrane integrity and energy production; disruption impairs autophagy and cardiac function.
What are the synonyms for phosphatidylethanolamine catabolic process?
Synonyms include phosphatidylethanolamine breakdown, phosphatidylethanolamine catabolism, and phosphatidylethanolamine degradation.
Conclusion
Phosphatidylethanolamine catabolic process (GO:0046338) is a fundamental biological pathway that regulates membrane lipid composition, ferroptosis, autophagy, and mitochondrial function. Its dysregulation is implicated in acute kidney injury, cardiovascular disease, and neurodegeneration, making it a compelling target for therapeutic intervention. Advances in CRISPR-based models and lipidomics are accelerating our understanding of this process and its role in health and disease.
References
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- 2. Durgan J et al.. 2021. Non-canonical autophagy drives alternative ATG8 conjugation to phosphatidylserine.. Mol Cell 81(9):2031-2040.e8 PMID: 33909989
- 3. Vance JE. 2015. Phospholipid synthesis and transport in mammalian cells.. Traffic 16(1):1-18 PMID: 25243850
- 4. Ferreira HB et al.. 2025. Lipidomic Signature of Abdominal Aortic Aneurysm and Peripheral Artery Disease.. J Proteome Res 24(10):4865-4874 PMID: 40910695
- 5. Wu JH et al.. 2025. Metabolism-dependent succinylation governs resource allocation for antibiotic resistance.. Sci Adv 11(34):eadu2856 PMID: 40845110
- 6. Tatsuta T et al.. 2017. Intramitochondrial phospholipid trafficking.. Biochim Biophys Acta Mol Cell Biol Lipids 1862(1):81-89 PMID: 27542541
- 7. Hong W et al.. 2025. Age-associated reduction in ER-Mitochondrial contacts impairs mitochondrial lipid metabolism and autophagosome formation in the heart.. Cell Death Differ 32(10):1900-1914 PMID: 40254645
