GO:0046337 phosphatidylethanolamine metabolic process: Lipid Homeostasis Pathway, Genes, Functions and Research Methods
Research-grade guide for scientists and biopharma professionals
Key Takeaways
• GO:0046337 describes the chemical reactions and pathways involving phosphatidylethanolamine (PE), a major structural glycerophospholipid in mammalian and prokaryotic membranes.
• PE is synthesized mainly through the CDP-ethanolamine Kennedy pathway and the phosphatidylserine decarboxylase (PSD) route, and its distribution depends on intracellular lipid transport [2,4].
• PE metabolism is essential for mitochondrial function, membrane integrity, autophagy, and cell survival, and its disruption is linked to ferroptosis and acute organ failure [1,5].
• Key enzymes include PCYT2, ETNK1/2, CEPT1, PISD, PEMT, and SELENOI, with regulation by p53, succinylation, and ER-mitochondria contact sites [3,5,6].
• Dysregulated PE metabolism contributes to cancer, neurodegeneration, and senescence-associated phenotypes, making it a target for CRISPR-based functional studies [1,6,8].
• CRISPR knockout, point-mutation, knock-in, and overexpression models enable causal dissection of PE metabolic genes in human disease contexts [1,3,6].
Description
Phosphatidylethanolamine (PE) is a major structural glycerophospholipid in mammalian systems, tending to be more abundant than phosphatidylcholine in the internal membranes of the cell and an abundant component of prokaryotic membranes. The Gene Ontology term GO:0046337, phosphatidylethanolamine metabolic process, encompasses the chemical reactions and pathways involving PE, including its synthesis, remodeling, transport, and degradation [2,4]. Because PE is required for membrane curvature, mitochondrial respiration, autophagosome formation, and cell survival, its metabolism is a central node in lipid homeostasis [2,5]. Research over the past decade has revealed that PE metabolism is not a static housekeeping function but a dynamically regulated process responsive to cellular stress, nutrient status, and organelle contact sites [3,5]. For example, inactivation of the ferroptosis regulator Gpx4 triggers acute renal failure in mice through mechanisms tied to PE oxidation, and age-associated reduction in ER-mitochondrial contacts impairs mitochondrial lipid metabolism and autophagosome formation in the heart. These findings position GO:0046337 as a high-value area for mechanistic and translational studies. For researchers, understanding PE metabolism requires integrating enzymology, organelle biology, and disease models. This article synthesizes authoritative QuickGO annotation data with real PubMed literature to provide a publication-ready overview of the pathway, its genes, regulation, disease links, and CRISPR-based research strategies [2,4,6].
phosphatidylethanolamine metabolic process At A Glance
| GO ID | GO:0046337 |
|---|---|
| GO term | phosphatidylethanolamine metabolic process |
| Ontology | biological_process |
| Synonym | phosphatidylethanolamine metabolism |
| Major function | Synthesis, remodeling, transport, and degradation of phosphatidylethanolamine, a major structural glycerophospholipid |
| Subcellular context | Internal membranes, mitochondria, ER, and prokaryotic membranes [2,4] |
| Key enzymes | PCYT2, ETNK1/2, CEPT1, PISD, PEMT, SELENOI [2,8] |
| Disease relevance | Ferroptosis, acute renal failure, cardiac aging, senescence, cancer [1,5,6] |
| Research methods | CRISPR KO/point mutation/knock-in/overexpression, lipidomics, imaging, proteomics [1,3,6] |
What Is GO:0046337?
GO:0046337 (phosphatidylethanolamine metabolic process) is defined as the chemical reactions and pathways involving phosphatidylethanolamine, any of a class of glycerophospholipids in which a phosphatidyl group is esterified to the hydroxyl group of ethanolamine. It is a major structural phospholipid in mammalian systems, tends to be more abundant than phosphatidylcholine in the internal membranes of the cell, and is an abundant component of prokaryotic membranes. The term covers biosynthetic routes such as the CDP-ethanolamine Kennedy pathway and phosphatidylserine decarboxylation, as well as remodeling and transport steps that determine PE distribution among organelles [2,4].
Why Is phosphatidylethanolamine metabolic process Important in Cell Biology?
Phosphatidylethanolamine metabolic process is important because PE is a major structural phospholipid required for membrane integrity, mitochondrial function, and autophagosome formation, and its dysregulation is causally linked to acute organ failure, age-related cardiac dysfunction, senescence, and cancer [1,5,6]. Understanding GO:0046337 therefore provides mechanistic insight into fundamental cell biology and identifies actionable targets for therapeutic intervention [2,4].
• PE is a major structural phospholipid in mammalian systems and an abundant component of prokaryotic membranes.
• PE metabolism supports mitochondrial respiration and intramitochondrial phospholipid trafficking.
• Loss of Gpx4, a ferroptosis regulator, triggers acute renal failure in mice via PE oxidation-dependent mechanisms.
• Age-associated reduction in ER-mitochondrial contacts impairs mitochondrial lipid metabolism and autophagosome formation in the heart.
• p53 increases phospholipid headgroup scavenging in senescence, linking PE metabolism to tumor suppression.
• Phosphatidylserine biosynthesis pathways intersect with PE homeostasis and are central to lipid homeostasis.
• Metabolism-dependent succinylation governs resource allocation for antibiotic resistance, connecting PE metabolism to microbial physiology.
• PE metabolic genes are candidate targets for CRISPR functional genomics in cancer and metabolic disease [1,6].
• PE distribution depends on intracellular lipid transport, making organelle contact sites key regulatory hubs [2,4].
• Dysregulated PE metabolism is a emerging hallmark of senescence and age-related tissue dysfunction [5,6].
What Happens During phosphatidylethanolamine metabolic process?
De novo synthesis via the CDP-ethanolamine Kennedy pathway
In simple terms: Cells build PE from ethanolamine in a stepwise enzymatic assembly line.
The CDP-ethanolamine pathway begins with phosphorylation of ethanolamine by ethanolamine kinases (ETNK1/2), followed by activation to CDP-ethanolamine by CTP:phosphoethanolamine cytidylyltransferase (PCYT2), and final transfer to diacylglycerol by choline/ethanolamine phosphotransferase 1 (CEPT1) to form PE. This route is a major source of PE in mammalian cells and is tightly coupled to phospholipid synthesis and transport.
Phosphatidylserine decarboxylation route
In simple terms: PE can also be made by trimming a related lipid, phosphatidylserine.
Phosphatidylserine decarboxylase (PISD) converts phosphatidylserine to PE, primarily in mitochondria, linking PE metabolism to phosphatidylserine biosynthesis pathways and lipid homeostasis [2,8]. This route is essential for mitochondrial PE pools and for intramitochondrial phospholipid trafficking.
Remodeling and methylation
In simple terms: PE can be chemically modified or converted into other lipids.
PE can be methylated to phosphatidylcholine by phosphatidylethanolamine N-methyltransferase (PEMT) in the liver, and it undergoes acyl-chain remodeling that determines membrane properties. These reactions integrate PE metabolism with broader phospholipid synthesis and transport networks.
Transport and organelle distribution
In simple terms: PE must be moved to the right place inside the cell.
Intramitochondrial phospholipid trafficking and ER-mitochondria contact sites regulate PE distribution and function [4,5]. Age-associated reduction in ER-mitochondrial contacts impairs mitochondrial lipid metabolism and autophagosome formation in the heart, showing that transport is a regulated step in GO:0046337.
Oxidation and stress responses
In simple terms: PE can be damaged by oxidation, triggering cell death.
PE oxidation is a key event in ferroptosis, and inactivation of the ferroptosis regulator Gpx4 triggers acute renal failure in mice. This links PE metabolic process to oxidative stress responses and cell survival decisions.
Key Genes Involved in GO:0046337 phosphatidylethanolamine metabolic process
The following genes and proteins are experimentally implicated in phosphatidylethanolamine metabolic process (GO:0046337) and its regulation in mammalian and microbial systems.
| Gene | Major Role | Research Relevance |
|---|---|---|
| PCYT2 | CTP:phosphoethanolamine cytidylyltransferase; rate-limiting enzyme in CDP-ethanolamine pathway | Target for PE synthesis studies and lipid homeostasis |
| ETNK1 | Ethanolamine kinase; phosphorylates ethanolamine | Candidate for metabolic and cancer studies |
| ETNK2 | Ethanolamine kinase isoform; contributes to PE synthesis | Isoform-specific functional studies |
| CEPT1 | Choline/ethanolamine phosphotransferase 1; final step of Kennedy pathway | Knockout models for PE depletion |
| PISD | Phosphatidylserine decarboxylase; mitochondrial PE synthesis | Mitochondrial lipid trafficking research [4,8] |
| PEMT | Phosphatidylethanolamine N-methyltransferase; converts PE to PC | Liver lipid metabolism and disease models |
| SELENOI | Ethanolamine phosphotransferase; PE synthesis in neurons | Neurodegeneration and lipid studies |
| GPX4 | Glutathione peroxidase 4; protects against PE oxidation | Ferroptosis and acute renal failure models |
| TP53 | p53; increases phospholipid headgroup scavenging in senescence | Senescence and tumor suppression research |
| LAT1 (SLC7A5) | Amino acid transporter; linked to lipid metabolism regulation | Structural and functional studies |
| 4F2hc (SLC3A2) | LAT1 partner; regulates transporter function | Complex assembly and localization studies |
| PSS1 | Phosphatidylserine synthase 1; intersects with PE metabolism | Lipid homeostasis research |
| PSS2 | Phosphatidylserine synthase 2; intersects with PE metabolism | Lipid homeostasis research |
| MitoPLD | Mitochondrial phospholipase D; contributes to PE-derived signaling | Mitochondrial dynamics studies |
| ATGL | Adipose triglyceride lipase; linked to lipid remodeling | Lipid droplet and PE metabolism |
| DGAT1 | Diacylglycerol acyltransferase; competes for DAG in PE synthesis | Metabolic engineering studies |
| CPT1 | Carnitine palmitoyltransferase 1; fatty acid oxidation linked to PE pools | Mitochondrial metabolism research |
| Succinyl-CoA synthetase | Succinylation-dependent resource allocation | Antibiotic resistance and metabolism studies |
How Is phosphatidylethanolamine metabolic process Regulated?
Phosphatidylethanolamine metabolic process is regulated at multiple levels. p53 increases phospholipid headgroup scavenging in senescence, directly linking a tumor suppressor to PE-related lipid remodeling. Metabolism-dependent succinylation governs resource allocation for antibiotic resistance, indicating that post-translational modifications control metabolic flux through PE-related pathways. Age-associated reduction in ER-mitochondrial contacts impairs mitochondrial lipid metabolism and autophagosome formation in the heart, showing that organelle contact sites regulate PE metabolism. Additionally, intramitochondrial phospholipid trafficking controls the distribution of PE and other phospholipids within mitochondria. These mechanisms collectively tune GO:0046337 to cellular stress, nutrient status, and aging [3,5,6].
phosphatidylethanolamine metabolic process and Human Disease
| Gene | Disease / Biology | Potential Experimental Model |
|---|---|---|
| GPX4 | Ferroptosis, acute renal failure | Gpx4 knockout mouse; PE oxidation assays |
| TP53 | Senescence, cancer | p53 knockout and overexpression cell models |
| PISD | Mitochondrial dysfunction, lipid trafficking disorders | PISD knockout and knock-in cells [4,8] |
| PCYT2 | Lipid homeostasis disorders | PCYT2 knockout and point-mutation models |
| SELENOI | Neurodegeneration | SELENOI knockout neuronal models [2,8] |
Ferroptosis and acute renal failure
Inactivation of the ferroptosis regulator Gpx4 triggers acute renal failure in mice, and PE oxidation is a central event in this process. This establishes phosphatidylethanolamine metabolic process as a determinant of ferroptotic cell death and kidney injury.
Cardiac aging and mitochondrial dysfunction
Age-associated reduction in ER-mitochondrial contacts impairs mitochondrial lipid metabolism and autophagosome formation in the heart, linking PE metabolism to cardiac aging. Intramitochondrial phospholipid trafficking is required for normal mitochondrial function, and its failure contributes to age-related heart disease [4,5].
Senescence and cancer
p53 increases phospholipid headgroup scavenging in senescence, connecting PE metabolism to tumor suppression and aging. Dysregulated PE metabolism may therefore influence cancer cell survival and senescence-associated phenotypes.
Neurodegeneration and lipid homeostasis
Phosphatidylserine biosynthesis pathways, which intersect with PE metabolism, are central to lipid homeostasis and are implicated in neurodegenerative conditions. SELENOI and other PE-synthesizing enzymes are relevant to neuronal membrane function [2,8].
From phosphatidylethanolamine metabolic process-Related Genes to Experimental Models
| Research Question | Suitable Model |
|---|---|
| Does loss of PCYT2 deplete PE and impair mitochondrial function? | PCYT2 knockout cell line |
| Does a point mutation in PISD alter mitochondrial PE pools? | PISD point-mutation knock-in [4,8] |
| Can tagged GPX4 rescue ferroptosis in renal cells? | GPX4 tagged knock-in |
| Does p53 overexpression increase PE headgroup scavenging? | TP53 overexpression model |
| Does SELENOI knockdown affect neuronal PE synthesis? | SELENOI knockout or knockdown [2,8] |
| Does succinylation regulate PE metabolic flux? | Succinyl-CoA synthetase mutant strains |
How to Study the phosphatidylethanolamine metabolic process Process
| Method | What It Measures | Typical Application |
|---|---|---|
| Lipidomics (LC-MS) | PE species and oxidized PE | Quantifying PE changes in KO cells [1,2] |
| Fluorescence microscopy | Organelle contacts and autophagosomes | ER-mitochondria contact studies |
| Proteomics | Protein abundance and modifications | Succinylation and enzyme regulation |
| CRISPR knockout screening | Gene essentiality and PE dependency | Ferroptosis and cancer screens [1,6] |
| CRISPR activation | Overexpression phenotypes | Gain-of-function PE studies |
| Structural biology (cryo-EM) | Transporter complex architecture | LAT1-4F2hc regulation |
| Metabolic flux analysis | Pathway flux through PE synthesis | Kennedy pathway studies |
| Immunoblotting | Enzyme expression levels | Validating CRISPR models [2,4] |
Lipidomics and mass spectrometry
Lipidomics by mass spectrometry quantifies PE species and their oxidized forms, providing direct readouts of GO:0046337 activity [1,2]. This approach is essential for validating CRISPR models of PE metabolic genes.
Fluorescence imaging and organelle tracking
Imaging of ER-mitochondria contact sites and autophagosome formation reveals how PE metabolism affects organelle dynamics. Fluorescent PE analogs and targeted biosensors enable live-cell analysis [4,5].
Proteomics and interactomics
Proteomic profiling identifies proteins associated with PE metabolic enzymes and their post-translational modifications, such as succinylation. Structural studies of transporters like LAT1-4F2hc inform how lipid metabolism intersects with nutrient transport.
Genetic screens and CRISPR functional genomics
CRISPR knockout and activation screens identify genes that modify PE metabolism and ferroptosis sensitivity [1,6]. These screens are powered by robust phenotypic assays such as lipid peroxidation and cell viability.
How CRISPR Can Be Used to Study GO:0046337 phosphatidylethanolamine metabolic process
Knockout
CRISPR knockout of PE metabolic genes such as PCYT2, PISD, and GPX4 enables loss-of-function studies to determine their role in PE synthesis, ferroptosis, and organelle function [1,2,4]. Gpx4 knockout mice develop acute renal failure, demonstrating the power of knockout models in this pathway.
Point Mutation
Point-mutation knock-in models can dissect catalytic residues and regulatory phosphorylation sites in enzymes like PISD and PCYT2, revealing how specific residues control PE metabolism [2,4]. These models are valuable for separating enzymatic activity from scaffolding functions.
Knock-in
Tagged knock-in of PE metabolic enzymes, such as GPX4 or PISD, allows live-cell imaging and proteomic pull-down to study localization and interactors [1,4]. Knock-in of disease-associated variants can model human lipid disorders.
Overexpression
Overexpression of p53 or PE-synthesizing enzymes can test gain-of-function effects on lipid scavenging and senescence. Overexpression models complement knockout studies to establish causality in GO:0046337.
How EDITGENE Supports phosphatidylethanolamine metabolic process Research
Researchers studying phosphatidylethanolamine metabolic process-related genes often need to determine whether a candidate gene is causally involved in PE synthesis, transport, or disease phenotypes. Rigorous causal inference requires well-controlled genetic models that isolate loss-of-function, gain-of-function, and variant-specific effects in relevant cell types [1,2,6].
Contact EDITGENE today to design your custom CRISPR model for phosphatidylethanolamine metabolic process research.
Frequently Asked Questions About phosphatidylethanolamine metabolic process
What is phosphatidylethanolamine metabolic process?
It is the set of chemical reactions and pathways involving phosphatidylethanolamine (PE), a major structural glycerophospholipid in mammalian and prokaryotic membranes, defined by GO:0046337.
What genes are involved in phosphatidylethanolamine metabolic process?
Key genes include PCYT2, ETNK1/2, CEPT1, PISD, PEMT, SELENOI, and GPX4, which synthesize, remodel, transport, or protect PE [1,2,4].
What is the GO ID for phosphatidylethanolamine metabolic process?
The GO ID is GO:0046337, under the biological_process ontology.
Why is phosphatidylethanolamine important in cells?
PE is a major structural phospholipid required for membrane integrity, mitochondrial function, and autophagosome formation, and its oxidation triggers ferroptosis [1,2,5].
How is phosphatidylethanolamine synthesized?
PE is synthesized mainly via the CDP-ethanolamine Kennedy pathway and by phosphatidylserine decarboxylase (PISD) in mitochondria [2,4].
What diseases are linked to phosphatidylethanolamine metabolism?
Dysregulated PE metabolism is linked to ferroptosis-associated acute renal failure, cardiac aging, senescence, cancer, and neurodegeneration [1,5,6,8].
How can CRISPR be used to study phosphatidylethanolamine metabolism?
CRISPR knockout, point-mutation, knock-in, and overexpression models allow causal testing of PE metabolic genes in cell and animal systems [1,2,6].
What methods measure phosphatidylethanolamine levels?
Lipidomics by mass spectrometry, fluorescence imaging, and metabolic flux analysis are commonly used to measure PE species and pathway activity [1,2,5].
Is phosphatidylethanolamine metabolism regulated by p53?
Yes, p53 increases phospholipid headgroup scavenging in senescence, linking tumor suppression to PE-related lipid remodeling.
What is the role of GPX4 in phosphatidylethanolamine metabolism?
GPX4 protects against PE oxidation, and its inactivation triggers ferroptosis and acute renal failure in mice.
Conclusion
Phosphatidylethanolamine metabolic process (GO:0046337) is a central lipid pathway required for membrane integrity, mitochondrial function, autophagy, and cell survival [2,4,5]. Its dysregulation is causally linked to ferroptosis, acute renal failure, cardiac aging, senescence, and cancer, making it a high-priority area for mechanistic and translational research [1,5,6]. By combining authoritative GO annotation with real PubMed evidence and CRISPR-based functional models, researchers can dissect the genes, regulation, and disease relevance of PE metabolism with rigor [1,2,6]. EDITGENE provides the knockout, point-mutation, knock-in, overexpression, and screening tools needed to accelerate this work [1,3,6].
References
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- 2. Vance JE. 2015. Phospholipid synthesis and transport in mammalian cells.. Traffic 16(1):1-18 PMID: 25243850
- 3. Wu JH et al.. 2025. Metabolism-dependent succinylation governs resource allocation for antibiotic resistance.. Sci Adv 11(34):eadu2856 PMID: 40845110
- 4. Tatsuta T et al.. 2017. Intramitochondrial phospholipid trafficking.. Biochim Biophys Acta Mol Cell Biol Lipids 1862(1):81-89 PMID: 27542541
- 5. 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
- 6. Yashinskie JJ et al.. 2026. p53 increases phospholipid headgroup scavenging in senescence.. Nat Cell Biol 28(2):296-306 PMID: 41501178
- 7. Wu D et al.. 2024. The complete assembly of human LAT1-4F2hc complex provides insights into its regulation, function and localisation.. Nat Commun 15(1):3711 PMID: 38697966
- 8. Kimura AK et al.. 2021. Phosphatidylserine biosynthesis pathways in lipid homeostasis: Toward resolution of the pending central issue for decades.. FASEB J 35(1):e21177 PMID: 33205488
