GO:0006658 phosphatidylserine metabolic process: Membrane Asymmetry Pathway, Genes, Functions and Research Methods
Research-grade guide for scientists and biopharma professionals
Key Takeaways
• GO:0006658 phosphatidylserine metabolic process describes the chemical reactions and pathways involving phosphatidylserine (PS), a glycerophospholipid in which the phosphatidyl group is esterified to the hydroxyl group of L-serine.
• PS is a major anionic phospholipid of cell membranes and is normally kept on the inner leaflet of the plasma membrane, creating membrane asymmetry that is essential for cell life.
• Loss of PS asymmetry, exposing PS on the outer leaflet, is a hallmark of apoptosis and also occurs during erythrocyte death and in cancer cells.
• PS metabolism and transport are central to brain function, where PS is the major acidic phospholipid and supports membrane signaling and synaptic activity.
• PS exposure on activated platelets and endotoxin-stimulated cells links PS metabolism to coagulation and innate immune pathways.
• PS content on virions can modulate host factor binding, as shown for GAS6 binding among closely related flaviviruses.
Description
Phosphatidylserine (PS) is a glycerophospholipid in which the phosphatidyl group is esterified to the hydroxyl group of L-serine, and it is an important constituent of cell membranes. The Gene Ontology term GO:0006658, phosphatidylserine metabolic process, encompasses the chemical reactions and pathways involving phosphatidylserines, including their synthesis, remodeling, transport and exposure. PS is unusual among phospholipids because its distribution across the membrane bilayer is highly regulated: it is concentrated on the cytoplasmic leaflet in healthy cells, and its appearance on the extracellular surface is a signal with profound biological consequences. Researchers study PS metabolism because it sits at the intersection of membrane biology, cell death, immunity and disease. In the brain, PS is the most abundant acidic phospholipid and contributes to membrane function and signaling. In blood and immune cells, PS exposure drives processes such as coagulation and apoptotic clearance. In cancer, PS externalization has been exploited as a targeting biomarker. Understanding GO:0006658 therefore requires integrating lipid biochemistry, membrane trafficking and cell physiology.
phosphatidylserine metabolic process At A Glance
| GO ID | GO:0006658 |
|---|---|
| GO term | phosphatidylserine metabolic process |
| Ontology | biological_process |
| Synonym | phosphatidylserine metabolism |
| Definition | The chemical reactions and pathways involving phosphatidylserines, any of a class of glycerophospholipids in which the phosphatidyl group is esterified to the hydroxyl group of L-serine. |
| Major function | Synthesis, remodeling, transport and regulated exposure of phosphatidylserine in cell membranes |
| Key lipid class | Glycerophospholipid with phosphatidyl group esterified to L-serine |
| Cellular context | Membrane asymmetry, apoptosis, coagulation, brain lipid metabolism |
| Representative processes | PS synthesis, PS transport, PS externalization, PS-dependent signaling |
What Is GO:0006658?
GO:0006658 phosphatidylserine metabolic process is defined as the chemical reactions and pathways involving phosphatidylserines, any of a class of glycerophospholipids in which the phosphatidyl group is esterified to the hydroxyl group of L-serine. In practice, this term covers the enzymatic steps that produce, modify and redistribute PS within cells, as well as the transport reactions that maintain its asymmetric distribution across membranes. It is a biological_process term, and its synonym is phosphatidylserine metabolism.
Why Is phosphatidylserine metabolic process Important in Cell Biology?
Phosphatidylserine metabolic process is important because PS is not merely a structural lipid; its location and abundance encode information that cells use to survive, signal and die. The maintenance of PS asymmetry is a fundamental feature of healthy membranes, and its collapse is a recognized marker of apoptosis and other forms of cell death. Because PS exposure influences coagulation, immune recognition and cancer targeting, the pathways that regulate PS metabolism are directly relevant to thrombosis, inflammation and oncology. In the brain, PS metabolism supports the unique lipid environment required for neuronal function. Consequently, genes and enzymes within GO:0006658 are studied as potential therapeutic targets and as biomarkers across multiple disease areas.
• PS is a major anionic phospholipid required for normal membrane structure and function.
• Membrane asymmetry of PS is essential for cell life and is disrupted during cell death.
• PS externalization is a hallmark of apoptosis and erythrocyte death.
• PS exposure on activated cells contributes to coagulation cascade activation.
• PS is a cancer cell targeting biomarker, enabling PS-directed detection and therapy.
• PS metabolism is critical in the brain, where PS is the major acidic phospholipid.
• PS transport pathways are central to cell life and death decisions.
• PS content on virions can modulate host factor binding and infection.
• PS-dependent membrane changes influence sheddase and signaling activity.
• PS asymmetry affects the conformation and dynamics of membrane-associated proteins such as calreticulin.
What Happens During phosphatidylserine metabolic process?
PS biosynthesis and remodeling
In simple terms: Cells build phosphatidylserine and then adjust its fatty acid chains to suit different membranes.
Phosphatidylserine is synthesized and subsequently remodeled, and in the brain PS is the major acidic phospholipid, where its metabolism supports membrane function and signaling. The pathways that produce and modify PS are part of GO:0006658 and provide the lipid substrate pool for downstream transport and exposure events.
Maintenance of membrane asymmetry
In simple terms: Healthy cells keep phosphatidylserine on the inside of the membrane and away from the outside surface.
PS is normally restricted to the inner leaflet of the plasma membrane, and this asymmetric distribution is actively maintained. Membrane asymmetry regulates the function of membrane proteins, including sheddases such as ADAM17, illustrating how PS distribution influences signaling. The biophysical environment created by PS also affects the conformation and dynamics of proteins that associate with membranes, such as calreticulin.
PS transport and externalization
In simple terms: When cells receive certain signals, phosphatidylserine can be moved to the outer surface of the membrane.
Phosphatidylserine transport is central to cell life and death, and specific transport pathways control the redistribution of PS between membrane leaflets. Externalization of PS occurs during apoptosis and other regulated processes, where it serves as a recognition signal. In erythrocytes, chemically induced suicidal death is accompanied by PS exposure.
PS exposure in coagulation and immunity
In simple terms: When phosphatidylserine appears on the outside of cells, it can trigger blood clotting and immune responses.
Bacterial endotoxin activates the coagulation cascade through Gasdermin D-dependent phosphatidylserine exposure, directly linking PS externalization to innate immune and coagulation pathways. This demonstrates that PS metabolism and exposure are not passive events but actively regulate host defense and thrombosis.
PS in apoptosis and cell death
In simple terms: Phosphatidylserine on the outer membrane is a signal that a cell is dying and should be cleared.
PS exposure is a well-established marker of apoptosis, and the raft-like membrane environment associated with apoptotic PS affects the behavior of proteins such as calreticulin. In cancer, PS externalization is a targetable feature of tumor cells and their vasculature, supporting the use of PS as a biomarker. These observations connect GO:0006658 to cell death and cancer biology.
PS in viral infection and host factor binding
In simple terms: Viruses can carry phosphatidylserine on their surface, which affects how they interact with host proteins.
Variation in virion phosphatidylserine content drives differential GAS6 binding among closely related flaviviruses, showing that PS levels on viral particles can modulate host factor recruitment. This places PS metabolism within the broader context of host-pathogen interactions.
Key Genes Involved in GO:0006658 phosphatidylserine metabolic process
The following genes and proteins are representative of the phosphatidylserine metabolic process and its regulatory network, based on the cited literature.
| Gene | Major Role | Research Relevance |
|---|---|---|
| PTDSS1 | Phosphatidylserine synthase 1, catalyzes PS synthesis | Core biosynthetic enzyme for GO:0006658 |
| PTDSS2 | Phosphatidylserine synthase 2, catalyzes PS synthesis | Alternative PS synthesis pathway |
| PSS1 | Phosphatidylserine synthase, produces PS from phosphatidylcholine | PS biosynthesis in mammalian cells |
| PSS2 | Phosphatidylserine synthase, produces PS from phosphatidylethanolamine | PS biosynthesis and membrane lipid homeostasis |
| XKR8 | Scramblase that exposes PS during apoptosis | PS externalization in cell death |
| TMEM16F | Calcium-activated scramblase | PS exposure in platelets and immune cells |
| ATP11A | Flippase that maintains PS on the inner leaflet | Membrane asymmetry maintenance |
| ATP11C | Flippase that maintains PS on the inner leaflet | Membrane asymmetry and PS transport |
| GAS6 | PS-binding ligand that bridges PS to receptors | PS-dependent signaling and viral binding |
| AXL | Receptor tyrosine kinase activated by GAS6-PS complexes | PS-dependent cell survival and cancer |
| MERTK | Receptor tyrosine kinase involved in PS recognition | Apoptotic cell clearance |
| ADAM17 | Sheddase regulated by membrane asymmetry | PS-dependent ectodomain shedding |
| Calreticulin | Chaperone whose membrane interaction is influenced by PS | Apoptotic membrane biology |
| Gasdermin D | Pore-forming protein linked to PS exposure | Endotoxin-induced coagulation |
| Caspase-3 | Executioner caspase activated during apoptosis | Upstream of PS externalization |
| Caspase-7 | Executioner caspase activated during apoptosis | Upstream of PS externalization |
| BCL-2 family proteins | Regulate mitochondrial apoptosis | Indirect regulators of PS exposure |
How Is phosphatidylserine metabolic process Regulated?
Phosphatidylserine metabolic process is regulated at multiple levels. Membrane asymmetry is actively maintained by flippases that keep PS on the inner leaflet, while scramblases mediate PS exposure when cells receive death or activation signals. Calcium signaling is a known trigger for scramblase activity in platelets and other cells. In the brain, PS metabolism is tuned to support neuronal membrane function. The interaction of PS with proteins such as GAS6 and its receptors provides a layer of regulation that couples PS exposure to downstream signaling. Additionally, the biophysical state of the membrane, including raft-like domains, influences how PS-interacting proteins behave.
phosphatidylserine metabolic process and Human Disease
| Gene | Disease / Biology | Potential Experimental Model |
|---|---|---|
| XKR8 | Apoptotic PS exposure in cancer | XKR8 knockout cancer cell lines |
| TMEM16F | Platelet activation and coagulation | TMEM16F point-mutation platelets |
| GAS6 | Viral infection and cancer signaling | GAS6 knock-in reporter cells |
| ATP11A | Membrane asymmetry and cell survival | ATP11A overexpression lines |
| Gasdermin D | Endotoxin-induced coagulation | Gasdermin D knockout macrophages |
Cancer
Phosphatidylserine externalization is a feature of cancer cells and tumor vasculature, and PS has been developed as a cancer cell targeting biomarker. This makes PS metabolism and exposure attractive for imaging and therapeutic strategies.
Coagulation and inflammation
Bacterial endotoxin activates the coagulation cascade through Gasdermin D-dependent phosphatidylserine exposure, linking PS metabolism to sepsis-associated thrombosis and innate immunity. PS exposure on activated cells is therefore a key node in inflammatory coagulation.
Neurodegeneration and brain disorders
PS is the major acidic phospholipid in the brain, and its metabolism and function are important for neuronal membranes. Disruption of PS homeostasis may contribute to brain pathology, although specific mechanisms require further study.
Erythrocyte disorders
Myricetin-induced suicidal erythrocyte death involves PS exposure, indicating that PS metabolism is relevant to red blood cell survival and clearance. This has implications for anemia and hemolytic conditions.
From phosphatidylserine metabolic process-Related Genes to Experimental Models
| Research Question | Suitable Model |
|---|---|
| Does loss of a flippase cause PS exposure? | Knockout cell line for ATP11A or ATP11C |
| Does a point mutation in a scramblase alter PS externalization? | Point-mutation knock-in of TMEM16F |
| Can PS reporter track real-time exposure? | Tagged knock-in of a PS-binding domain |
| Does overexpression of a PS synthase increase PS levels? | Overexpression cell model for PTDSS1 |
| Which genes regulate PS-dependent coagulation? | CRISPR library screening in macrophage models |
| How does PS content affect viral binding? | Knock-in of viral PS-modifying enzymes in producer cells |
How to Study the phosphatidylserine metabolic process Process
| Method | What It Measures | Typical Application |
|---|---|---|
| Lipidomics / mass spectrometry | PS species abundance and composition | Quantifying PS changes after gene editing |
| Annexin V flow cytometry | Externalized PS | Apoptosis and cell death assays |
| Fluorescence microscopy | PS distribution and membrane domains | Membrane asymmetry studies |
| CRISPR knockout | Loss-of-function of PS-related genes | Causal gene discovery |
| CRISPR knock-in | Tagged or mutant PS proteins | Live-cell PS tracking |
| Coagulation assays | PS-dependent thrombin generation | Endotoxin and platelet studies |
| Viral binding assays | GAS6-PS interaction | Flavivirus host factor studies |
Lipidomics and mass spectrometry
Mass spectrometry-based lipidomics quantifies PS species and their fatty acyl composition, providing direct readouts of GO:0006658 activity. This approach is essential for measuring changes in PS abundance after genetic perturbation.
Flow cytometry with PS-binding probes
Annexin V and other PS-binding probes detect externalized PS on the cell surface, a standard assay for apoptosis and PS exposure. This method is widely used to study PS externalization in cancer and erythrocyte death.
Imaging of membrane asymmetry
Fluorescence imaging with PS-specific reporters allows visualization of PS distribution across membranes and in raft-like domains. Such imaging has been used to study calreticulin dynamics on apoptotic membranes.
Genetic and biochemical perturbation
Knockout, knockdown and overexpression of PS-metabolizing enzymes, flippases and scramblases are used to dissect pathway function. These approaches can be combined with coagulation or viral binding assays to link PS to physiology.
How CRISPR Can Be Used to Study GO:0006658 phosphatidylserine metabolic process
Knockout
CRISPR knockout of genes such as XKR8, TMEM16F or ATP11A can reveal their roles in PS exposure and membrane asymmetry. Knockout models are useful for testing whether a candidate gene is required for PS-dependent processes such as apoptosis or coagulation.
Point Mutation
Point-mutation knock-in can model disease-associated or functional variants in PS-metabolizing enzymes and scramblases. Such models help distinguish catalytic activity from scaffolding functions in PS metabolism.
Knock-in
Knock-in of fluorescent or affinity tags into PS-related genes enables real-time tracking of protein localization and PS dynamics. Tagged knock-in models are valuable for imaging membrane asymmetry in living cells.
Overexpression
Overexpression of PS synthases or scramblases can increase PS levels or exposure, providing gain-of-function models for pathway analysis. These models are used to study PS-dependent signaling in cancer and brain cells.
How EDITGENE Supports phosphatidylserine metabolic process Research
Researchers studying phosphatidylserine metabolic process-related genes often need to determine whether a candidate gene is causally involved in PS synthesis, transport or exposure. EDITGENE provides CRISPR-based cell model services that enable precise genetic perturbations for such studies.
Contact EDITGENE today to design your custom CRISPR model for phosphatidylserine metabolic process research.
Frequently Asked Questions About phosphatidylserine metabolic process
What is phosphatidylserine metabolic process?
It is the set of chemical reactions and pathways involving phosphatidylserine, a glycerophospholipid in which the phosphatidyl group is esterified to the hydroxyl group of L-serine, as defined by GO:0006658.
What is the GO ID for phosphatidylserine metabolic process?
The GO ID is GO:0006658, and the official name is phosphatidylserine metabolic process.
What genes are involved in phosphatidylserine metabolic process?
Genes include PTDSS1, PTDSS2, XKR8, TMEM16F, ATP11A, ATP11C, GAS6 and others involved in PS synthesis, transport and exposure.
Why is phosphatidylserine important in the brain?
Phosphatidylserine is the major acidic phospholipid in the brain, where its metabolism and function support membrane signaling and neuronal activity.
How is phosphatidylserine exposed during apoptosis?
During apoptosis, PS is externalized to the cell surface, where it serves as a recognition signal, and this process involves scramblases and loss of membrane asymmetry.
What is the role of phosphatidylserine in blood coagulation?
Bacterial endotoxin activates the coagulation cascade through Gasdermin D-dependent phosphatidylserine exposure, linking PS to thrombosis.
Is phosphatidylserine a cancer biomarker?
Yes, phosphatidylserine externalization is a feature of cancer cells and tumor vasculature, and PS has been developed as a cancer cell targeting biomarker.
How do viruses interact with phosphatidylserine?
Variation in virion phosphatidylserine content drives differential GAS6 binding among closely related flaviviruses, showing that PS modulates host factor recruitment.
What methods are used to study phosphatidylserine metabolism?
Common methods include lipidomics, Annexin V flow cytometry, fluorescence imaging and CRISPR-based genetic perturbation.
Can CRISPR be used to study phosphatidylserine metabolic process?
Yes, CRISPR knockout, point mutation, knock-in and overexpression models can be used to dissect PS-related gene function.
Conclusion
GO:0006658 phosphatidylserine metabolic process captures the synthesis, remodeling, transport and regulated exposure of phosphatidylserine, a lipid whose asymmetric distribution is fundamental to cell life and death. Its relevance spans brain function, apoptosis, coagulation, immunity and cancer, making it a rich area for mechanistic and translational research. CRISPR-based cell models provide a powerful way to test causal roles of PS-related genes and to develop new insights into this pathway.
References
- 1. Kim HY et al.. 2014. Phosphatidylserine in the brain: metabolism and function.. Prog Lipid Res 56:1-18 PMID: 24992464
- 2. Yang X et al.. 2019. Bacterial Endotoxin Activates the Coagulation Cascade through Gasdermin D-Dependent Phosphatidylserine Exposure.. Immunity 51(6):983-996.e6 PMID: 31836429
- 3. Liu J et al.. 2023. Myricetin-induced suicidal erythrocyte death.. Mol Biol Rep 50(5):4253-4260 PMID: 36905403
- 4. Wang L et al.. 2020. Molecular insights into the effect of an apoptotic raft-like bilayer on the conformation and dynamics of calreticulin.. Biochim Biophys Acta Biomembr 1862(2):183146 PMID: 31816323
- 5. Sharma B et al.. 2018. Phosphatidylserine: A cancer cell targeting biomarker.. Semin Cancer Biol 52(Pt 1):17-25 PMID: 28870843
- 6. Čopič A et al.. 2023. Phosphatidylserine transport in cell life and death.. Curr Opin Cell Biol 83:102192 PMID: 37413778
- 7. Sommer A et al.. 2016. How membrane asymmetry regulates ADAM17 sheddase function.. Cell Cycle 15(22):2995-2996 PMID: 27463373
- 8. Zhang L et al.. 2025. Variation in virion phosphatidylserine content drives differential GAS6 binding among closely related flaviviruses.. J Virol 99(10):e0111125 PMID: 40990511
