GO:0008970 glycerophospholipid phospholipase A1 activity: Mechanism, Genes and Research Methods
Research-grade guide for scientists and biopharma professionals
Key Takeaways
• GO:0008970 (glycerophospholipid phospholipase A1 activity) catalyzes the hydrolysis of the sn-1 acyl ester bond of a 1,2-diacyl-sn-glycero-3-phospholipid, releasing a 2-acyl-lysophospholipid and a free fatty acid.
• This activity is mediated by enzymes such as phosphatidylserine-specific phospholipase A1 (PS-PLA1), HRASLS family proteins, and bacterial glycerol ester hydrolase (Geh).
• The reaction products, lysophospholipids and fatty acids, are bioactive lipid mediators involved in inflammation, autophagy, and membrane remodeling.
• Dysregulation of phospholipase A1 activity is linked to miscarriage risk, macrophage inflammation, and Staphylococcus aureus virulence.
• Key experimental approaches include CRISPR knockout, point mutation, knock-in, overexpression, lipidomics, and biochemical activity assays.
• EDITGENE provides CRISPR cell model services to study glycerophospholipid phospholipase A1 activity in disease and lipid signaling.
Description
Glycerophospholipid phospholipase A1 activity (GO:0008970) is a molecular function that removes the fatty acid at the sn-1 position of diacyl phospholipids, generating a 2-acyl-lysophospholipid and a free fatty acid. This activity is distinct from phospholipase A2, which cleaves the sn-2 bond, and it plays a central role in phospholipid remodeling and the production of lipid mediators. The reaction is catalyzed by a diverse set of enzymes, including phosphatidylserine-specific phospholipase A1 (PS-PLA1), HRASLS family members, and bacterial glycerol ester hydrolase (Geh). Researchers study this activity because its products, lysophosphatidylserine, lysophosphatidylcholine, and lysophosphatidylglycerol, are signaling molecules that regulate immune responses, autophagy, and membrane dynamics. In humans, PS-PLA1 has been implicated in macrophage inflammation and miscarriage risk, while bacterial Geh contributes to extracellular lysophosphatidylglycerol production and virulence. Understanding GO:0008970 therefore bridges lipid biochemistry, immunology, and microbiology, and it offers targets for therapeutic intervention in inflammatory and reproductive disorders.
glycerophospholipid phospholipase A1 activity At A Glance
| GO ID | GO:0008970 |
|---|---|
| GO term | glycerophospholipid phospholipase A1 activity |
| Ontology | molecular_function |
| Synonym | diacylphospholipase A1 activity; phosphatidylcholine 1-acylhydrolase activity; phosphatidylserine 1-acylhydrolase activity; phospholipase A1 activity |
| Major function | Hydrolysis of the sn-1 acyl ester bond of diacyl phospholipids to produce 2-acyl-lysophospholipids and free fatty acids |
| Substrate | 1,2-diacyl-sn-glycero-3-phospholipid (e.g., phosphatidylcholine, phosphatidylserine) |
| Products | 2-acyl-sn-glycero-3-phospholipid (lysophospholipid), fatty acid, H+ |
| Cofactors | Water is required for hydrolysis; activity can be modulated by membrane lipids |
| Representative enzymes | PS-PLA1, HRASLS family proteins, Geh |
What Is GO:0008970?
According to the Gene Ontology, GO:0008970 describes the catalysis of the reaction: a 1,2-diacyl-sn-glycero-3-phospholipid + H2O = a 2-acyl-sn-glycero-3-phospholipid + a fatty acid + H+. In simpler terms, it is an enzyme activity that clips the fatty acid attached to the first carbon (sn-1) of a diacyl phospholipid, leaving a lysophospholipid with a single fatty acid at the sn-2 position. The substrate must have a diacyl group attached to the glycerol backbone, and the reaction requires water. This activity is synonymous with diacylphospholipase A1 activity, phosphatidylcholine 1-acylhydrolase activity, phosphatidylserine 1-acylhydrolase activity, and phospholipase A1 activity.
Why Is glycerophospholipid phospholipase A1 activity Important in Cell Biology?
Glycerophospholipid phospholipase A1 activity (GO:0008970) is important because it generates lysophospholipids and free fatty acids that act as signaling molecules in inflammation, immunity, and membrane remodeling. The reaction is a key step in phospholipid turnover and in the production of extracellular lysophosphatidylglycerol by Staphylococcus aureus, which contributes to bacterial virulence. In humans, PS-PLA1 activity influences macrophage inflammation and decidual macrophage residence, and its dysregulation is associated with increased miscarriage risk. Moreover, the HRASLS subfamily of enzymes, which includes phospholipase A1 and acyltransferase activities, regulates organelle dynamics and lipid signaling. Therefore, understanding GO:0008970 provides mechanistic insights into lipid-mediated disease processes and identifies potential targets for therapeutic intervention.
• Generates lysophospholipids that act as bioactive mediators in inflammation and autophagy.
• Contributes to membrane phospholipid remodeling and organelle dynamics.
• Plays a role in Staphylococcus aureus virulence through extracellular lysophosphatidylglycerol production.
• PS-PLA1 activity modulates macrophage inflammation via MAPK signaling.
• Defective lysophosphatidic acid-autophagy axis involving phospholipase A1 activity increases miscarriage risk.
• HRASLS family enzymes with phospholipase A1 activity regulate lipid signaling and tumor suppression.
• Membrane lipid composition can modulate lysosomal phospholipase A1 activity.
• Provides potential biomarkers and therapeutic targets for inflammatory and reproductive disorders.
Molecular Mechanism of glycerophospholipid phospholipase A1 activity
Substrate recognition and binding
In simple terms: The enzyme finds and grabs a phospholipid molecule in the membrane.
Glycerophospholipid phospholipase A1 enzymes recognize diacyl phospholipids such as phosphatidylcholine and phosphatidylserine within membrane bilayers. The substrate must have a diacyl group attached to the glycerol backbone, and the enzyme binds to the membrane interface to access the sn-1 acyl chain. Phosphatidylserine-specific phospholipase A1 (PS-PLA1) shows specificity for phosphatidylserine, while other enzymes may prefer phosphatidylcholine or phosphatidylglycerol.
Catalytic hydrolysis of the sn-1 ester bond
In simple terms: Water is used to cut the fatty acid off the first carbon of the glycerol backbone.
The catalytic mechanism involves nucleophilic attack by water on the ester bond at the sn-1 position, resulting in the release of a free fatty acid and the formation of a 2-acyl-lysophospholipid. This reaction is distinct from phospholipase A2 activity, which cleaves the sn-2 bond. The activity of lysosomal phospholipase A1 can be modulated by membrane lipids, indicating that the lipid environment influences catalysis.
Product formation and release
In simple terms: The cut products, a lysophospholipid and a fatty acid, are released and can act as signals.
The products of the reaction are a 2-acyl-sn-glycero-3-phospholipid (lysophospholipid), a fatty acid, and a proton. These products can remain in the membrane or be released extracellularly, as seen with Staphylococcus aureus Geh, which produces extracellular 2-12(S)-methyltetradecanoyl-lysophosphatidylglycerol. The lysophospholipids generated can serve as signaling molecules in inflammation and autophagy.
Regulation by membrane lipids and cellular context
In simple terms: The surrounding membrane fats can turn the enzyme up or down.
The activity of lysosomal phospholipase A1 is modulated by membrane lipids, suggesting that lipid composition regulates enzyme function. In macrophages, PS-PLA1 activity alleviates lipopolysaccharide-induced inflammation by inhibiting MAPK activation, indicating that signaling pathways can regulate the biological impact of this activity. The HRASLS subfamily of enzymes, which includes phospholipase A1 and acyltransferase activities, is involved in organelle dynamics and lipid signaling, further highlighting regulatory complexity.
Key Genes Involved in GO:0008970 glycerophospholipid phospholipase A1 activity
The following genes encode enzymes or related proteins that exhibit glycerophospholipid phospholipase A1 activity or regulate its function.
| Gene | Major Role | Research Relevance |
|---|---|---|
| PLA1A | Encodes phosphatidylserine-specific phospholipase A1 (PS-PLA1) that hydrolyzes phosphatidylserine | Involved in macrophage inflammation and miscarriage risk |
| HRASLS | HRASLS family proteins possess phospholipase A1 and acyltransferase activities | Regulate lipid signaling and organelle dynamics |
| GDE1 | Glycerophosphodiester phosphodiesterase 1 may have related lipid hydrolase activity | Potential role in lipid metabolism |
| ABHD12 | Alpha/beta hydrolase domain-containing protein 12, a lysophospholipase | Linked to neurodegeneration and lipid signaling |
| ABHD16A | Alpha/beta hydrolase domain-containing protein 16A, a phosphatidylserine lipase | Regulates immune cell function |
| PLA2G4A | Cytosolic phospholipase A2, distinct from PLA1 but related in lipid mediator production | Inflammation research |
| LPLAT | Lysophospholipid acyltransferases that re-acylate lysophospholipids | Membrane remodeling and organelle dynamics |
| GNPAT | Dihydroxyacetone phosphate acyltransferase, involved in ether lipid synthesis | Peroxisomal lipid metabolism |
| AGPAT | 1-acylglycerol-3-phosphate O-acyltransferase, involved in phospholipid synthesis | Lipid droplet and membrane biogenesis |
| PLAAT1 | Phospholipase A and acyltransferase 1, a HRASLS family member | Tumor suppressor and lipid signaling |
| PLAAT2 | Phospholipase A and acyltransferase 2 | Lipid metabolism and cancer |
| PLAAT3 | Phospholipase A and acyltransferase 3 | Regulation of lipid signaling |
| PLAAT4 | Phospholipase A and acyltransferase 4 | Involved in organelle dynamics |
| PLAAT5 | Phospholipase A and acyltransferase 5 | Lipid mediator production |
| Geh | Glycerol ester hydrolase in Staphylococcus aureus with phospholipase A1 activity | Bacterial virulence and extracellular lysophosphatidylglycerol production |
| PS-PLA1 | Phosphatidylserine-specific phospholipase A1 | Biomarker for inflammatory diseases |
How Is glycerophospholipid phospholipase A1 activity Regulated?
Glycerophospholipid phospholipase A1 activity is regulated at multiple levels. Membrane lipid composition can modulate the activity of lysosomal phospholipase A1, indicating that the local lipid environment influences catalysis. In macrophages, PS-PLA1 activity alleviates lipopolysaccharide-induced inflammation by inhibiting MAPK activation, suggesting that signaling pathways can regulate the biological impact of this activity. The HRASLS subfamily of enzymes, which includes phospholipase A1 and acyltransferase activities, is involved in organelle dynamics and lipid signaling, further highlighting regulatory complexity. Additionally, the autophagy-lysophosphatidic acid axis involving phospholipase A1 activity is critical for decidual macrophage residence and miscarriage risk.
glycerophospholipid phospholipase A1 activity and Human Disease
| Gene | Disease / Biology | Potential Experimental Model |
|---|---|---|
| PLA1A | Miscarriage risk and macrophage inflammation | Knockout mice or human macrophage cell lines |
| Geh | Staphylococcus aureus virulence | Bacterial knockout and lipidomics |
| HRASLS | Cancer and lipid signaling | Overexpression and knockout in cancer cell lines |
| ABHD12 | Neurodegeneration | Knockout mouse models and neuronal cells |
| PLAAT3 | Metabolic disorders | Point mutation knock-in in cell lines |
Miscarriage and reproductive disorders
A defective lysophosphatidic acid-autophagy axis involving phospholipase A1 activity increases miscarriage risk by restricting decidual macrophage residence. This highlights the importance of phospholipase A1 in reproductive immunology and pregnancy maintenance.
Inflammation and macrophage function
Phosphatidylserine-specific phospholipase A1 (PS-PLA1) alleviates lipopolysaccharide-induced macrophage inflammation by inhibiting MAPK activation. Dysregulated PS-PLA1 activity may contribute to chronic inflammatory conditions.
Bacterial virulence
The phospholipase A1 activity of glycerol ester hydrolase (Geh) in Staphylococcus aureus is responsible for extracellular production of 2-12(S)-methyltetradecanoyl-lysophosphatidylglycerol, a virulence-associated lipid. This activity contributes to bacterial pathogenesis.
Cancer and lipid signaling
HRASLS family proteins, which possess phospholipase A1 activity, have been implicated in tumor suppression and lipid signaling. Their dual phospholipase/acyltransferase activities may influence cancer cell lipid metabolism.
From glycerophospholipid phospholipase A1 activity-Related Genes to Experimental Models
| Research Question | Suitable Model |
|---|---|
| Does loss of PS-PLA1 affect macrophage inflammation? | PLA1A knockout in human macrophage cell lines |
| How does Geh phospholipase A1 activity contribute to S. aureus virulence? | Geh knockout in Staphylococcus aureus |
| What is the role of HRASLS in lipid signaling? | Overexpression of HRASLS in HEK293 cells |
| How does membrane lipid composition regulate lysosomal PLA1? | In vitro enzyme assays with varying lipid vesicles |
| Does PS-PLA1 mutation affect miscarriage risk? | Point mutation knock-in mouse models |
| Can PS-PLA1 be used as a biomarker? | Tagged knock-in for live-cell imaging |
How to Study the glycerophospholipid phospholipase A1 activity Process
| Method | What It Measures | Typical Application |
|---|---|---|
| Fluorescent PLA1 assay | Enzymatic hydrolysis of sn-1 acyl chain | Kinetic characterization of PS-PLA1 |
| Lipidomics (LC-MS) | Phospholipid and lysophospholipid profiles | Detecting Geh-dependent lysophosphatidylglycerol |
| CRISPR knockout screen | Gene requirement for lipid signaling | Identifying regulators of macrophage inflammation |
| Western blot | Protein expression levels | Validating knockout or overexpression |
| Immunofluorescence | Subcellular localization | Studying organelle dynamics |
| qRT-PCR | mRNA expression | Measuring PLA1A or HRASLS transcripts |
| Autophagy flux assay | Autophagic activity | Linking phospholipase A1 to autophagy |
| Bacterial virulence assay | Pathogen survival or host response | Testing Geh mutants in infection models |
Biochemical activity assays
Phospholipase A1 activity can be measured using fluorescent or radioactive phospholipid substrates, such as phosphatidylserine or phosphatidylcholine labeled at the sn-1 position. These assays quantify the release of free fatty acids or lysophospholipids and are used to characterize enzyme kinetics and substrate specificity.
Lipidomics and mass spectrometry
Mass spectrometry-based lipidomics allows comprehensive profiling of phospholipids and lysophospholipids in cells or tissues, enabling researchers to detect changes in glycerophospholipid phospholipase A1 activity. This approach has been used to identify extracellular lysophosphatidylglycerol produced by Staphylococcus aureus Geh.
CRISPR-based genetic screens
CRISPR knockout screens can identify genes required for phospholipase A1 activity or its downstream effects. For example, knocking out PLA1A or HRASLS family genes in cell lines followed by lipidomics can reveal their contributions to lipid signaling.
Imaging and subcellular localization
Fluorescently tagged phospholipase A1 enzymes can be used to study subcellular localization and organelle dynamics. Live-cell imaging of tagged PS-PLA1 or HRASLS proteins helps determine where the activity occurs within the cell.
How CRISPR Can Be Used to Study GO:0008970 glycerophospholipid phospholipase A1 activity
Knockout
CRISPR knockout of PLA1A or HRASLS family genes can abolish glycerophospholipid phospholipase A1 activity, allowing researchers to study its role in lipid signaling, inflammation, and autophagy. For example, PLA1A knockout in macrophages can reveal its impact on MAPK activation and cytokine production.
Point Mutation
Point mutations in the catalytic serine or aspartate residues of phospholipase A1 enzymes can selectively eliminate enzymatic activity without affecting protein expression or localization. Such models are useful for dissecting the enzymatic versus non-enzymatic functions of PS-PLA1 or HRASLS proteins.
Knock-in
Knock-in of tagged versions of phospholipase A1 enzymes (e.g., GFP or HA tags) enables live-cell imaging and proteomic analysis of protein interactions. Knock-in of disease-associated mutations can model human disorders linked to phospholipase A1 dysfunction.
Overexpression
Overexpression of PS-PLA1 or HRASLS proteins in cell lines can amplify phospholipase A1 activity and its downstream effects, such as lysophospholipid production and changes in organelle dynamics. This approach is useful for gain-of-function studies and for identifying downstream signaling pathways.
How EDITGENE Supports glycerophospholipid phospholipase A1 activity Research
Researchers studying glycerophospholipid phospholipase A1 activity-related genes often need to determine whether a candidate gene is causally involved in lipid signaling, inflammation, or disease. EDITGENE provides a comprehensive suite of CRISPR cell model services to accelerate this research, from knockout to knock-in and library screening.
Contact EDITGENE today to design your custom CRISPR model for glycerophospholipid phospholipase A1 activity research.
Frequently Asked Questions About glycerophospholipid phospholipase A1 activity
What is glycerophospholipid phospholipase A1 activity?
It is an enzyme activity (GO:0008970) that hydrolyzes the sn-1 acyl ester bond of diacyl phospholipids, producing a 2-acyl-lysophospholipid and a free fatty acid.
What genes are involved in glycerophospholipid phospholipase A1 activity?
Key genes include PLA1A (PS-PLA1), HRASLS family members, and bacterial Geh.
What is the difference between phospholipase A1 and A2?
Phospholipase A1 cleaves the sn-1 acyl chain, while phospholipase A2 cleaves the sn-2 position of phospholipids.
How is glycerophospholipid phospholipase A1 activity measured?
It can be measured using fluorescent or radioactive phospholipid substrates, lipidomics, or mass spectrometry.
What diseases are linked to phospholipase A1 activity?
It has been linked to miscarriage risk, macrophage inflammation, and Staphylococcus aureus virulence.
What is PS-PLA1?
PS-PLA1 is phosphatidylserine-specific phospholipase A1, an enzyme that exhibits glycerophospholipid phospholipase A1 activity and is involved in inflammation.
Can CRISPR be used to study phospholipase A1 activity?
Yes, CRISPR knockout, point mutation, knock-in, and overexpression models are widely used to study phospholipase A1 genes.
What are the products of glycerophospholipid phospholipase A1 activity?
The products are a 2-acyl-sn-glycero-3-phospholipid (lysophospholipid), a fatty acid, and a proton.
How does membrane lipid composition affect phospholipase A1 activity?
Membrane lipids can modulate lysosomal phospholipase A1 activity, indicating that the lipid environment regulates enzyme function.
What is the role of HRASLS proteins in phospholipase A1 activity?
HRASLS family proteins possess phospholipase A1 and acyltransferase activities and regulate lipid signaling and organelle dynamics.
Conclusion
Glycerophospholipid phospholipase A1 activity (GO:0008970) is a fundamental enzymatic function that generates bioactive lysophospholipids and free fatty acids, influencing inflammation, autophagy, and membrane remodeling. Its dysregulation is associated with miscarriage risk, macrophage inflammation, and bacterial virulence, making it a compelling target for therapeutic research. Advances in CRISPR-based cell models and lipidomics are accelerating our understanding of this activity and its role in human disease.
References
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- 2. Yang HL et al.. 2022. A defective lysophosphatidic acid-autophagy axis increases miscarriage risk by restricting decidual macrophage residence.. Autophagy 18(10):2459-2480 PMID: 35220880
- 3. Subramanian C et al.. 2023. The Phospholipase A1 Activity of Glycerol Ester Hydrolase (Geh) Is Responsible for Extracellular 2-12(S)-Methyltetradecanoyl-Lysophosphatidylglycerol Production in Staphylococcus aureus.. mSphere 8(2):e0003123 PMID: 36976028
- 4. Piret J et al.. 2005. Modulation of the in vitro activity of lysosomal phospholipase A1 by membrane lipids.. Chem Phys Lipids 133(1):1-15 PMID: 15589222
- 5. Zhao Y et al.. 2021. Phosphatidylserine-specific phospholipase A1: A friend or the devil in disguise.. Prog Lipid Res 83:101112 PMID: 34166709
- 6. Matsumoto N et al.. 2026. Phospholipase A and acyltransferases as novel regulator of organelle dynamics.. J Biochem 179(2):83-86 PMID: 41328535
- 7. Mardian EB et al.. 2015. The HRASLS (PLA/AT) subfamily of enzymes.. J Biomed Sci 22:99 PMID: 26503625
- 8. Zhang W et al.. 2022. Phosphatidylserine-Specific Phospholipase A1 Alleviates Lipopolysaccharide-Induced Macrophage Inflammation by Inhibiting MAPKs Activation.. Biol Pharm Bull 45(8):1061-1068 PMID: 35650027
