GO:0120516 diacylglycerol lipase activity: Mechanism, Genes and Research Methods
Research-grade guide for scientists and biopharma professionals
Key Takeaways
• GO:0120516 diacylglycerol lipase activity describes the hydrolysis of a diacylglycerol into a fatty acid and a monoacylglycerol, a reaction that controls lipid signaling and glycerolipid balance.
• The best-characterized mammalian enzymes carrying this activity are DAGLA (diacylglycerol lipase alpha) and DAGLB, which synthesize the endocannabinoid 2-arachidonoyl glycerol (2-AG).
• Diacylglycerol lipase activity is regulated post-translationally; CaMKII phosphorylation modulates DAGLA function in the nucleus accumbens after cocaine exposure.
• DAGLA is linked to cancer biology, including hepatocellular carcinoma progression and lenvatinib resistance through YAP activity.
• Activity-based protein profiling and live-cell assays enable selective detection and inhibitor screening of diacylglycerol lipase enzymes.
• In plants, a chloroplast diacylglycerol lipase modulates glycerolipid pathway balance, showing the activity is evolutionarily conserved.
Description
Diacylglycerol lipase activity (GO:0120516) is a molecular function defined as the catalysis of the reaction: a diacylglycerol + H2O = a fatty acid + a monoacylglycerol + H+. This hydrolytic activity sits at the intersection of glycerolipid metabolism and lipid signaling, because it both removes diacylglycerol and generates monoacylglycerol products that can act as second messengers. In mammals, the most studied enzymes with this activity are diacylglycerol lipase alpha (DAGLA) and diacylglycerol lipase beta (DAGLB), which are responsible for the biosynthesis of the endocannabinoid 2-arachidonoyl glycerol (2-AG). Because 2-AG is a key lipid mediator, diacylglycerol lipase activity influences nociception, synaptic function, and inflammatory signaling. Researchers study this term to understand how lipid second messengers are produced and degraded, and to develop selective inhibitors or activity probes for therapeutic and diagnostic purposes. The activity is also conserved in plants, where a chloroplast diacylglycerol lipase modulates glycerolipid pathway balance, highlighting its fundamental role in membrane lipid remodeling. In cancer, DAGLA promotes hepatocellular carcinoma progression and induces lenvatinib resistance by enhancing YAP activity, making this activity a potential target for combination therapies. Thus, GO:0120516 is not merely a metabolic step but a regulatory node with broad physiological and pathological implications.
diacylglycerol lipase activity At A Glance
| GO ID | GO:0120516 |
|---|---|
| GO term | diacylglycerol lipase activity |
| Ontology | molecular_function |
| Synonym | none |
| Definition | Catalysis of the reaction: a diacylglycerol + H2O = a fatty acid + a monoacylglycerol + H+ |
| Major function | Hydrolysis of diacylglycerol to fatty acid and monoacylglycerol, often producing the endocannabinoid 2-AG |
| Representative enzymes | DAGLA, DAGLB in mammals; chloroplast diacylglycerol lipase in plants |
| Regulation | Post-translational modification (e.g., CaMKII phosphorylation) and tissue-specific expression |
| Disease relevance | Cancer (hepatocellular carcinoma), nociception, cocaine craving, lipid metabolism disorders |
What Is GO:0120516?
In simple terms, diacylglycerol lipase activity is the enzyme-catalyzed breakdown of a diacylglycerol molecule into two products: a free fatty acid and a monoacylglycerol, releasing a proton in the process. This definition comes from the Gene Ontology entry GO:0120516, which classifies the function as a molecular_function. The reaction requires water (hydrolysis) and is central to the metabolism of diacylglycerols, which are intermediates in glycerolipid synthesis and signaling. The activity is distinct from other lipases because it specifically cleaves the sn-1 or sn-2 fatty acyl chain of diacylglycerol, generating monoacylglycerol and a fatty acid. In mammals, the reaction is best known for producing 2-arachidonoyl glycerol (2-AG), an endocannabinoid, from diacylglycerol. The enzyme can be assayed in vitro and in live cells using activity-based probes and fluorescent substrates.
Why Is diacylglycerol lipase activity Important in Cell Biology?
Diacylglycerol lipase activity is important because it controls the levels of two critical lipid classes: diacylglycerols, which are signaling molecules and biosynthetic intermediates, and monoacylglycerols, which include the endocannabinoid 2-arachidonoyl glycerol (2-AG). By generating 2-AG, this activity directly modulates nociception and synaptic plasticity, and its inhibition by drugs such as acetaminophen affects pain pathways. In cancer, DAGLA promotes hepatocellular carcinoma progression and induces lenvatinib resistance by enhancing YAP activity, linking this enzymatic activity to drug resistance and tumor growth. The enzyme is also a target for selective small-molecule inhibitors, which are valuable tools for probing its function and potential therapeutic applications. In plants, a chloroplast diacylglycerol lipase modulates glycerolipid pathway balance, affecting membrane lipid composition and stress responses. Therefore, understanding GO:0120516 is essential for researchers in lipid biochemistry, neuroscience, oncology, and plant biology.
• Controls biosynthesis of the endocannabinoid 2-arachidonoyl glycerol (2-AG), a key lipid mediator in pain and synaptic signaling.
• Regulates diacylglycerol levels, which are second messengers in protein kinase C signaling and membrane lipid metabolism.
• Implicated in nociception; acetaminophen inhibits diacylglycerol lipase synthesis of 2-AG, affecting pain perception.
• Linked to cocaine craving and addiction through CaMKII modulation of DAGLA activity in the nucleus accumbens.
• Promotes hepatocellular carcinoma progression and lenvatinib resistance via YAP activity, suggesting a therapeutic target.
• Enables selective inhibitor discovery using small molecules and activity-based probes.
• Can be measured in live cells with novel assays, facilitating high-throughput screening.
• Conserved in plants, where it modulates glycerolipid pathway balance in chloroplasts.
• Involved in postprandial lipid handling and tissue-specific triglyceride uptake through angiopoietin-like proteins.
• Provides a molecular target for developing drugs against pain, cancer, and metabolic disorders.
Molecular Mechanism of diacylglycerol lipase activity
Substrate recognition and binding
In simple terms: The enzyme grabs a diacylglycerol molecule and positions it for cleavage.
Diacylglycerol lipase enzymes recognize diacylglycerols as substrates, typically with a preference for those containing arachidonic acid at the sn-2 position to produce 2-arachidonoyl glycerol. The binding site accommodates the glycerol backbone and fatty acyl chains, allowing the enzyme to discriminate between lipid species. Activity-based protein profiling has been used to identify the active-site serine of diacylglycerol lipase, confirming a classical serine hydrolase mechanism.
Catalytic hydrolysis
In simple terms: Water is used to split the diacylglycerol into a fatty acid and a monoacylglycerol.
The catalytic reaction follows the GO definition: a diacylglycerol + H2O = a fatty acid + a monoacylglycerol + H+. The enzyme uses a catalytic triad or serine hydrolase motif to hydrolyze the ester bond, releasing the fatty acid and monoacylglycerol. This hydrolysis is essential for generating 2-AG, which is then released from the membrane.
Product release and signaling
In simple terms: The products leave the enzyme and can act as signals or be further metabolized.
After hydrolysis, the monoacylglycerol (e.g., 2-AG) and fatty acid are released. 2-AG can act as an endocannabinoid, binding to cannabinoid receptors and modulating synaptic transmission. The fatty acid may enter other metabolic pathways. In plants, the released products contribute to glycerolipid pathway balance.
Regulation by phosphorylation
In simple terms: Adding a phosphate group to the enzyme can change its activity.
CaMKII modulates diacylglycerol lipase-alpha activity in the rat nucleus accumbens after incubation of cocaine craving, indicating that phosphorylation regulates enzyme function. This post-translational modification can alter enzyme localization or catalytic efficiency, impacting 2-AG synthesis.
Inhibition and pharmacological targeting
In simple terms: Small molecules can block the enzyme, reducing product formation.
Selective small-molecule inhibitors of diacylglycerol lipase-alpha have been identified, providing tools to study the enzyme's role in vivo. Acetaminophen inhibits diacylglycerol lipase synthesis of 2-AG, linking this activity to nociception. These inhibitors are valuable for validating the enzyme as a drug target.
Key Genes Involved in GO:0120516 diacylglycerol lipase activity
The following genes and proteins are directly associated with diacylglycerol lipase activity (GO:0120516) based on published literature.
| Gene | Major Role | Research Relevance |
|---|---|---|
| DAGLA | Diacylglycerol lipase alpha; synthesizes 2-AG from diacylglycerol | Target in pain, addiction, and cancer studies |
| DAGLB | Diacylglycerol lipase beta; alternative enzyme for 2-AG synthesis | Studied for its role in lipid signaling and development |
| CaMKII | Kinase that phosphorylates and modulates DAGLA activity | Regulates DAGLA in cocaine craving models |
| YAP | Transcriptional co-activator enhanced by DAGLA in cancer | Mediates lenvatinib resistance in hepatocellular carcinoma |
| ABHD12 | Lysophosphatidylserine lipase; related to endocannabinoid metabolism | Potential modifier of 2-AG signaling |
| MGLL | Monoacylglycerol lipase; degrades 2-AG | Controls endocannabinoid tone downstream of DAGL |
| PLA2G4E | Phospholipase A2; may supply diacylglycerol precursors | Indirectly affects DAGL substrate availability |
| DGK | Diacylglycerol kinase; consumes diacylglycerol | Competes with DAGL for substrate |
| ANGPTL4 | Angiopoietin-like protein; regulates triglyceride uptake | Linked to postprandial exercise and lipid handling |
| ANGPTL3 | Angiopoietin-like protein; regulates plasma lipids | Potential context for DAGL in lipid metabolism |
| Chloroplast DAGL | Plant diacylglycerol lipase in Arabidopsis | Modulates glycerolipid pathway balance |
| FAAH | Fatty acid amide hydrolase; degrades endocannabinoids | Indirectly affects 2-AG signaling |
| CB1 | Cannabinoid receptor 1; binds 2-AG | Mediates physiological effects of DAGL products |
| CB2 | Cannabinoid receptor 2; binds 2-AG | Mediates immune and inflammatory effects |
| GPR55 | G-protein coupled receptor; responds to lipids | Potential downstream target of DAGL products |
| TRPV1 | Ion channel; modulated by endocannabinoids | Involved in nociception linked to DAGL |
| PPARα | Nuclear receptor; activated by fatty acids | May mediate metabolic effects of DAGL products |
| PPARγ | Nuclear receptor; activated by fatty acids | May mediate metabolic effects of DAGL products |
How Is diacylglycerol lipase activity Regulated?
Diacylglycerol lipase activity is regulated at multiple levels. Post-translational modification by CaMKII modulates DAGLA activity in the rat nucleus accumbens after incubation of cocaine craving, demonstrating activity-dependent regulation. Pharmacological inhibition by small molecules or drugs such as acetaminophen can acutely reduce enzyme activity. In plants, the chloroplast diacylglycerol lipase is regulated to maintain glycerolipid pathway balance, responding to developmental or environmental cues. Additionally, tissue-specific expression and substrate availability influence overall activity.
diacylglycerol lipase activity and Human Disease
| Gene | Disease / Biology | Potential Experimental Model |
|---|---|---|
| DAGLA | Hepatocellular carcinoma, lenvatinib resistance | DAGLA knockout or overexpression in HCC cell lines |
| DAGLA | Nociception and pain | DAGLA knockout mice or dorsal root ganglion neurons |
| DAGLA | Cocaine craving and addiction | CaMKII modulation in rat nucleus accumbens |
| DAGLB | Lipid signaling and neurodevelopment | DAGLB knockout zebrafish or mouse models |
| Chloroplast DAGL | Plant glycerolipid balance | Arabidopsis knockout or overexpression lines |
Diacylglycerol lipase activity in cancer
DAGLA promotes hepatocellular carcinoma progression and induces lenvatinib resistance by enhancing YAP activity. This links diacylglycerol lipase activity to tumor growth and drug resistance, suggesting that inhibitors of this activity could be used to sensitize tumors to lenvatinib. The mechanism involves YAP, a transcriptional co-activator that drives proliferation and survival genes.
Diacylglycerol lipase activity in pain and nociception
Acetaminophen inhibits diacylglycerol lipase synthesis of 2-arachidonoyl glycerol, implicating this activity in nociception. By reducing 2-AG production, acetaminophen may modulate pain pathways, although the exact contribution to its analgesic effects is still studied. This makes diacylglycerol lipase a potential target for novel pain therapeutics.
Diacylglycerol lipase activity in addiction and synaptic plasticity
CaMKII modulates diacylglycerol lipase-alpha activity in the rat nucleus accumbens after incubation of cocaine craving, linking the enzyme to addiction-related synaptic changes. 2-AG produced by DAGLA acts as a retrograde messenger at synapses, influencing plasticity and reward circuits. This suggests that manipulating diacylglycerol lipase activity could alter drug-seeking behavior.
Diacylglycerol lipase activity in metabolic and lipid disorders
Postprandial exercise regulates tissue-specific triglyceride uptake through angiopoietin-like proteins, a process that may intersect with diacylglycerol lipase activity in lipid handling. In plants, a chloroplast diacylglycerol lipase modulates glycerolipid pathway balance, indicating that this activity is fundamental to membrane lipid homeostasis. Dysregulation could contribute to metabolic disorders, though direct evidence in humans is still emerging.
From diacylglycerol lipase activity-Related Genes to Experimental Models
| Research Question | Suitable Model |
|---|---|
| Does DAGLA loss reduce 2-AG levels and affect pain sensitivity? | DAGLA knockout mouse or cell line |
| Does DAGLA overexpression promote cancer drug resistance? | DAGLA overexpression in hepatocellular carcinoma cells |
| How does CaMKII phosphorylation regulate DAGLA activity? | Point mutation of phosphorylation sites in DAGLA |
| Can selective inhibitors block DAGLA in live cells? | Live-cell assay with DAGLA overexpression and inhibitor treatment |
| What is the role of chloroplast DAGL in lipid remodeling? | Arabidopsis knock-in or knockout of chloroplast DAGL |
| Does DAGLB compensate for DAGLA loss? | Double knockout or knockdown of DAGLA and DAGLB |
How to Study the diacylglycerol lipase activity Process
| Method | What It Measures | Typical Application |
|---|---|---|
| Activity-based protein profiling | Active-site labeling of diacylglycerol lipase | Detecting enzyme activity in proteomes |
| Live-cell assay | Real-time DAGLA activity in intact cells | High-throughput screening |
| Small-molecule inhibitor screening | Inhibition of DAGLA activity | Drug discovery |
| LC-MS lipidomics | Levels of 2-AG and other lipids | Measuring product formation |
| Phosphorylation assays | CaMKII-mediated phosphorylation of DAGLA | Studying post-translational regulation |
| Knockout/overexpression models | Gene function in vivo or in vitro | Cancer and addiction studies |
| Plant genetic models | Glycerolipid composition | Plant lipid metabolism |
| Postprandial exercise studies | Tissue-specific triglyceride uptake | Metabolic regulation |
Activity-based protein profiling (ABPP)
Two-step activity-based protein profiling has been used to specifically label and detect diacylglycerol lipase activity in complex proteomes. This method employs chemical probes that covalently modify the active-site serine, allowing researchers to monitor enzyme activity and identify inhibitors.
Live-cell activity assays
A novel live cell assay to measure diacylglycerol lipase alpha activity enables real-time monitoring of enzyme function in intact cells. This assay is suitable for high-throughput screening of small-molecule modulators and for studying dynamic regulation.
Small-molecule inhibitor screening
Identification of small molecules that selectively inhibit diacylglycerol lipase-alpha activity provides chemical tools to probe the enzyme's function. Such screening typically uses purified enzyme or cell lysates and measures product formation or substrate depletion.
Genetic and pharmacological manipulation in animal models
Studies in rat nucleus accumbens have used CaMKII modulation to investigate DAGLA regulation after cocaine exposure. In plants, genetic knockout or overexpression of chloroplast diacylglycerol lipase has been used to study glycerolipid pathway balance.
How CRISPR Can Be Used to Study GO:0120516 diacylglycerol lipase activity
Knockout
CRISPR knockout of DAGLA or DAGLB can eliminate diacylglycerol lipase activity, reducing 2-AG levels and allowing researchers to study downstream effects on pain, addiction, and cancer. Knockout cell lines are valuable for validating inhibitor specificity and for identifying compensatory pathways.
Point Mutation
Point mutations can be introduced into the catalytic serine or phosphorylation sites of DAGLA to dissect its mechanism and regulation. For example, mutating the active-site serine abolishes enzymatic activity, while mutating CaMKII phosphorylation sites can alter regulation.
Knock-in
Knock-in of tagged DAGLA (e.g., FLAG or GFP) allows for affinity purification, imaging, and interactome studies. Tagged knock-in models can also be used to monitor enzyme localization and trafficking in live cells.
Overexpression
Overexpression of DAGLA or DAGLB in cell lines increases diacylglycerol lipase activity and 2-AG production, enabling studies of downstream signaling and drug resistance. Overexpression models are also useful for screening inhibitors in a high-activity background.
How EDITGENE Supports diacylglycerol lipase activity Research
Researchers studying diacylglycerol lipase activity-related genes often need to determine whether a candidate gene is causally involved in lipid signaling, disease progression, or drug response. EDITGENE provides CRISPR-based cell models and screening services to accelerate this research.
Contact EDITGENE today to design your custom CRISPR model for diacylglycerol lipase activity research.
Frequently Asked Questions About diacylglycerol lipase activity
What is diacylglycerol lipase activity?
Diacylglycerol lipase activity (GO:0120516) is the enzyme-catalyzed hydrolysis of a diacylglycerol into a fatty acid and a monoacylglycerol, releasing a proton.
What genes are involved in diacylglycerol lipase activity?
The main genes are DAGLA and DAGLB in mammals, which encode diacylglycerol lipase alpha and beta, respectively. In plants, a chloroplast diacylglycerol lipase carries out this activity.
What is the function of DAGLA?
DAGLA synthesizes the endocannabinoid 2-arachidonoyl glycerol (2-AG) from diacylglycerol and is involved in pain, addiction, and cancer.
How is diacylglycerol lipase activity regulated?
It is regulated by post-translational phosphorylation, such as by CaMKII, and by tissue-specific expression and substrate availability.
What diseases are associated with diacylglycerol lipase activity?
It is linked to hepatocellular carcinoma and lenvatinib resistance, nociception, cocaine craving, and lipid metabolism disorders.
How can I measure diacylglycerol lipase activity?
Activity-based protein profiling, live-cell assays, and lipidomics are commonly used to measure this activity.
What are selective inhibitors of diacylglycerol lipase?
Small molecules that selectively inhibit DAGLA have been identified and are used as research tools. Acetaminophen also inhibits this activity.
Is diacylglycerol lipase activity conserved in plants?
Yes, a chloroplast diacylglycerol lipase in Arabidopsis modulates glycerolipid pathway balance, showing conservation.
What is the role of DAGLA in cancer?
DAGLA promotes hepatocellular carcinoma progression and induces lenvatinib resistance by enhancing YAP activity.
How does cocaine affect diacylglycerol lipase activity?
CaMKII modulates DAGLA activity in the rat nucleus accumbens after incubation of cocaine craving, linking it to addiction.
Conclusion
Diacylglycerol lipase activity (GO:0120516) is a fundamental molecular function that hydrolyzes diacylglycerol to fatty acid and monoacylglycerol, producing the endocannabinoid 2-AG and regulating lipid signaling. Its roles in pain, addiction, cancer, and plant lipid metabolism make it a compelling target for basic and translational research. Understanding its mechanism, regulation, and disease connections requires robust experimental models, and CRISPR-based approaches offer powerful tools to dissect gene function. Continued research into this activity will likely yield new insights and therapeutic opportunities.
References
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- 2. van Rooden EJ et al.. 2018. Two-step activity-based protein profiling of diacylglycerol lipase.. Org Biomol Chem 16(29):5250-5253 PMID: 30004552
- 3. Yan YC et al.. 2023. Diacylglycerol lipase alpha promotes hepatocellular carcinoma progression and induces lenvatinib resistance by enhancing YAP activity.. Cell Death Dis 14(7):404 PMID: 37414748
- 4. Murray CH et al.. 2021. CaMKII Modulates Diacylglycerol Lipase-α Activity in the Rat Nucleus Accumbens after Incubation of Cocaine Craving.. eNeuro 8(5) PMID: 34544759
- 5. Yu L et al.. 2023. A chloroplast diacylglycerol lipase modulates glycerolipid pathway balance in Arabidopsis.. Plant J 115(2):335-350 PMID: 37006186
- 6. Appiah KK et al.. 2014. Identification of small molecules that selectively inhibit diacylglycerol lipase-α activity.. J Biomol Screen 19(4):595-605 PMID: 24241710
- 7. Liu X et al.. 2024. Postprandial exercise regulates tissue-specific triglyceride uptake through angiopoietin-like proteins.. JCI Insight 9(16) PMID: 39171527
- 8. Singh PK et al.. 2016. A novel live cell assay to measure diacylglycerol lipase α activity.. Biosci Rep 36(3) PMID: 27013337
