GO:0017171 serine hydrolase activity: Mechanism, Genes and Research Methods
Research-grade guide for scientists and biopharma professionals
Key Takeaways
• GO:0017171 serine hydrolase activity describes a large class of enzymes that use a catalytic triad (serine nucleophile, acid, histidine) to hydrolyze substrates [1, 3].
• Serine hydrolases are found across all kingdoms and include proteases, lipases, esterases, and amidases, with many members implicated in human disease [2, 7].
• Activity-based protein profiling (ABPP) enables global monitoring of serine hydrolase activities in complex proteomes, revealing changes during infection, surgery, and disease [2, 3, 8].
• Dysregulated serine hydrolase activity contributes to cancer, neurodegeneration, and metabolic disorders, making these enzymes attractive drug targets [4, 6, 7].
• CRISPR-based knockout, point mutation, and knock-in models are essential for dissecting the specific roles of individual serine hydrolases in cellular pathways [4, 6].
• EDITGENE provides comprehensive CRISPR services to accelerate functional studies of serine hydrolase genes and their disease relevance.
Description
Serine hydrolases constitute one of the largest and most diverse enzyme families in nature, characterized by a conserved catalytic mechanism involving a serine nucleophile activated by a proton relay [1, 3]. The Gene Ontology term GO:0017171 serine hydrolase activity captures this fundamental molecular function, which is essential for numerous biological processes ranging from protein turnover to lipid metabolism [2, 7]. Researchers across microbiology, neuroscience, and oncology study serine hydrolases because their activities are tightly regulated and often dysregulated in disease [3, 4, 6]. The development of activity-based probes has revolutionized the field by allowing direct measurement of serine hydrolase activities in complex biological samples [2, 8]. This article provides a comprehensive overview of serine hydrolase activity, integrating authoritative GO definitions with real PubMed literature to support research and drug discovery efforts.
serine hydrolase activity At A Glance
| GO ID | GO:0017171 |
|---|---|
| GO term | serine hydrolase activity |
| Ontology | molecular_function |
| Synonym | none |
| Major function | Catalysis of substrate hydrolysis via a serine nucleophile and catalytic triad |
| Catalytic residues | Serine, histidine, aspartate/glutamate |
| Substrate types | Peptides, esters, amides, lipids |
| Representative enzymes | Trypsin, chymotrypsin, acetylcholinesterase, lipases |
| Related GO terms | serine-type peptidase activity, lipase activity, esterase activity |
What Is GO:0017171?
GO:0017171 serine hydrolase activity is defined as the catalysis of substrate hydrolysis through a mechanism that employs a catalytic triad consisting of a serine nucleophile, an acidic residue (such as aspartate or glutamate), and a basic residue (usually histidine) [1, 3]. This definition encompasses a wide range of enzymes that cleave peptide, ester, amide, and other bonds using the nucleophilic serine residue [2, 7].
Why Is serine hydrolase activity Important in Cell Biology?
Serine hydrolase activity is fundamental to countless physiological processes, including digestion, blood coagulation, immune response, and neurotransmitter signaling [2, 7]. Dysregulation of these enzymes is linked to cancer, neurodegenerative diseases, and infectious diseases, making them prime targets for therapeutic intervention [3, 4, 6]. The ability to profile serine hydrolase activities using chemical probes has provided critical insights into disease mechanisms and drug action [2, 8].
• Serine hydrolases are involved in the pathogenesis of Mycobacterium tuberculosis and are associated with bacterial persistence.
• Alterations in serine hydrolase activities occur during cardiac surgery and may serve as biomarkers of ischemia-reperfusion injury.
• PSD-95 depalmitoylation by serine hydrolases regulates synaptic plasticity and is implicated in neuropsychiatric disorders.
• Leukotriene A4 hydrolase, a serine hydrolase, is critical for inflammatory responses and its mutation affects enzyme activity.
• ABHD2, a serine hydrolase, plays a role in lipid signaling and has been linked to cancer and metabolic diseases.
• MAP4K2, a serine/threonine kinase, connects the Hippo pathway to autophagy, highlighting crosstalk with serine hydrolase signaling.
• Activity-based probes enable discovery of new serine hydrolases and evaluation of inhibitors.
• Serine hydrolases are emerging targets for anti-inflammatory, anticancer, and antimicrobial therapies [3, 7].
• Genetic models (knockout, knock-in) are essential to define the specific functions of individual serine hydrolases [4, 6].
• High-throughput screening of serine hydrolase inhibitors can be accelerated using radiometric and fluorescent assays.
What Happens During serine hydrolase activity?
Substrate binding and orientation
In simple terms: The enzyme grabs the target molecule and positions it for cutting.
Serine hydrolases bind substrates in a pocket that positions the scissile bond near the catalytic serine residue [1, 3]. This binding often involves hydrophobic and electrostatic interactions that stabilize the substrate and orient it for nucleophilic attack.
Nucleophilic attack by serine
In simple terms: The serine residue acts like a pair of scissors, cutting the substrate.
The hydroxyl group of the catalytic serine attacks the carbonyl carbon of the substrate, forming a tetrahedral intermediate [1, 7]. This step is facilitated by the catalytic histidine, which acts as a general base to activate the serine.
Formation and hydrolysis of acyl-enzyme intermediate
In simple terms: The enzyme temporarily holds onto part of the substrate, then releases it with water.
The substrate is cleaved, and the acyl portion becomes covalently attached to the serine, forming an acyl-enzyme intermediate [2, 7]. Subsequent hydrolysis by water releases the product and regenerates the free enzyme.
Product release and enzyme regeneration
In simple terms: The cut pieces are released, and the enzyme is ready to work again.
The product diffuses away, and the enzyme returns to its resting state, ready for another catalytic cycle [3, 8]. The catalytic triad is restored through proton transfer involving the histidine and acidic residue.
Key Genes Involved in GO:0017171 serine hydrolase activity
The following genes encode representative serine hydrolases or related proteins that are commonly studied in the context of GO:0017171.
| Gene | Major Role | Research Relevance |
|---|---|---|
| LTA4H | Leukotriene A4 hydrolase; converts LTA4 to LTB4 | Inflammation, asthma, cardiovascular disease |
| ABHD2 | Alpha/beta hydrolase domain-containing protein 2; lipid hydrolase | Cancer, lipid signaling, sperm capacitation |
| PSD-95 | Postsynaptic density protein 95; scaffold protein with depalmitoylating activity | Synaptic plasticity, neuropsychiatric disorders |
| MAP4K2 | Mitogen-activated protein kinase kinase kinase kinase 2; serine/threonine kinase | Hippo pathway, autophagy, energy stress |
| FASN | Fatty acid synthase; multifunctional enzyme with serine hydrolase domains | Cancer metabolism, lipogenesis |
| CES1 | Carboxylesterase 1; hydrolyzes esters and amides | Drug metabolism, detoxification |
| CES2 | Carboxylesterase 2; hydrolyzes esters | Drug metabolism, cancer chemotherapy |
| ACHE | Acetylcholinesterase; hydrolyzes acetylcholine | Neurodegeneration, Alzheimer's disease |
| BCHE | Butyrylcholinesterase; hydrolyzes choline esters | Neurodegeneration, drug metabolism |
| CTRB1 | Chymotrypsinogen B1; serine protease | Digestion, pancreatitis |
| CTRC | Chymotrypsin C; serine protease | Pancreatitis, digestive disorders |
| PRSS1 | Cationic trypsinogen; serine protease | Hereditary pancreatitis |
| ELANE | Neutrophil elastase; serine protease | Inflammation, neutropenia |
| MMP2 | Matrix metalloproteinase 2; not a serine hydrolase but often studied together | Cancer invasion, metastasis |
| DPP4 | Dipeptidyl peptidase 4; serine protease | Diabetes, immune regulation |
| FAP | Fibroblast activation protein; serine protease | Cancer stroma, wound healing |
| PREP | Prolyl endopeptidase; serine protease | Neurodegeneration, cognitive disorders |
| NR1H2 | Liver X receptor beta; regulates lipid metabolism genes | Metabolic disease, inflammation |
How Is serine hydrolase activity Regulated?
Serine hydrolase activity is regulated at multiple levels, including gene expression, post-translational modifications, and interaction with endogenous inhibitors. For example, leukotriene A4 hydrolase activity is modulated by phosphorylation and site-directed mutagenesis of serine-415 affects its catalytic function. Activity-based protein profiling has revealed that serine hydrolase activities change dynamically during Mycobacterium tuberculosis infection and persistence, suggesting tight regulation in response to environmental cues. In cardiac surgery, intraoperative changes in serine hydrolase activities indicate rapid regulation under stress. Additionally, the Hippo pathway kinase MAP4K2, which has serine/threonine kinase activity, connects energy stress to autophagy, illustrating crosstalk between signaling cascades and serine hydrolase-related processes.
serine hydrolase activity and Human Disease
| Gene | Disease / Biology | Potential Experimental Model |
|---|---|---|
| LTA4H | Inflammation, asthma, cardiovascular disease | Knockout mouse, point mutation (S415A) |
| ABHD2 | Cancer, lipid signaling | Knockout cell line, overexpression |
| PSD-95 | Neuropsychiatric disorders | Knock-in mouse, knockout |
| MAP4K2 | Autophagy, energy stress | Knockout, point mutation |
| ACHE | Alzheimer's disease | Knockout mouse, overexpression |
Serine hydrolases in infectious diseases
Mycobacterium tuberculosis relies on serine hydrolases for virulence and persistence, and systematic surveys have identified specific enzymes whose activities change during infection. These enzymes are potential targets for new anti-tuberculosis drugs. Activity-based probes have been used to visualize serine hydrolase activity in mycobacteria, providing tools for drug discovery.
Serine hydrolases in cancer and metabolic disorders
ABHD2, a serine hydrolase, is involved in lipid signaling and has been implicated in cancer progression and metabolic diseases. Leukotriene A4 hydrolase, another serine hydrolase, plays a key role in inflammation and its dysregulation is linked to cardiovascular disease and asthma. Inhibitors of serine hydrolases are being developed for cancer therapy.
Serine hydrolases in neurodegeneration
PSD-95 depalmitoylation by serine hydrolases regulates synaptic function, and dysregulation of this process is associated with neuropsychiatric disorders. Acetylcholinesterase, a classic serine hydrolase, is the target of drugs for Alzheimer's disease. Prolyl endopeptidase, another serine protease, has been implicated in cognitive disorders.
From serine hydrolase activity-Related Genes to Experimental Models
| Research Question | Suitable Model |
|---|---|
| Does loss of serine hydrolase X affect cell viability? | CRISPR knockout cell line |
| Does a specific point mutation in the catalytic serine abolish activity? | Point mutation knock-in |
| Can a tagged version of the enzyme be used for localization studies? | Tagged knock-in (e.g., GFP) |
| Does overexpression of the enzyme alter lipid metabolism? | Overexpression cell line |
| What is the role of the enzyme in autophagy? | Knockout and rescue with wild-type or mutant |
| Can activity-based probes detect the enzyme in complex samples? | ABPP with knockout as negative control |
How to Study the serine hydrolase activity Process
| Method | What It Measures | Typical Application |
|---|---|---|
| ABPP | Activity of serine hydrolases in proteomes | Profiling disease states, drug target engagement [2, 8] |
| Radiometric assay | Hydrolysis rate of radiolabeled substrate | Enzyme kinetics, inhibitor screening |
| Fluorescent assay | Fluorescence increase upon substrate cleavage | High-throughput screening |
| Site-directed mutagenesis | Effect of specific mutations on activity | Mechanistic studies |
| In-gel activity assay | Activity of enzymes separated by SDS-PAGE | Detection of multiple hydrolases |
| Mass spectrometry | Identification of labeled proteins | Target discovery |
| CRISPR knockout | Loss-of-function phenotype | Functional validation [4, 6] |
| Overexpression | Gain-of-function phenotype | Pathway analysis |
Activity-based protein profiling (ABPP)
ABPP uses chemical probes that covalently label active serine hydrolases, allowing their activities to be monitored in complex proteomes [2, 8]. This method has been applied to study serine hydrolase activities during cardiac surgery and in Mycobacterium tuberculosis [2, 3].
Radiometric and fluorescent assays
Radiometric assays measure the release of radioactive products from labeled substrates, providing sensitive detection of serine hydrolase activity. Fluorescent substrates are also widely used for high-throughput screening of inhibitors.
Site-directed mutagenesis
Mutating the catalytic serine or other triad residues to alanine abolishes hydrolase activity, confirming the mechanism and identifying key residues. This approach is essential for validating the function of specific serine hydrolases.
In-gel activity assays
Multi-layer in-gel activity assays allow visualization of serine hydrolase activity directly in polyacrylamide gels after electrophoresis, enabling detection of multiple enzymes in a single sample.
How CRISPR Can Be Used to Study GO:0017171 serine hydrolase activity
Knockout
CRISPR knockout of serine hydrolase genes is used to eliminate enzyme activity and study its cellular consequences. For example, knockout of ABHD2 has been used to investigate its role in lipid signaling. Knockout of MAP4K2 revealed its function in autophagy under energy stress.
Point Mutation
Point mutations in the catalytic serine or other triad residues (e.g., S415A in LTA4H) can be introduced using CRISPR to specifically abolish hydrolase activity without affecting protein expression. This is critical for distinguishing catalytic activity from scaffolding functions.
Knock-in
Knock-in of tagged versions (e.g., GFP, FLAG) allows visualization and immunoprecipitation of endogenous serine hydrolases. This approach has been used to study PSD-95 localization and interactions.
Overexpression
Overexpression of wild-type or mutant serine hydrolases in cell lines enables gain-of-function studies and analysis of downstream signaling pathways. Overexpression is often combined with knockout to confirm specificity.
How EDITGENE Supports serine hydrolase activity Research
Researchers studying serine hydrolase activity-related genes often need to determine whether a candidate gene is causally involved in a specific pathway or disease. EDITGENE provides a comprehensive suite of CRISPR services to generate precisely engineered cell models, enabling rigorous functional validation of serine hydrolases and their mutants.
Contact EDITGENE today to design your custom CRISPR model for serine hydrolase activity research.
Frequently Asked Questions About serine hydrolase activity
What is serine hydrolase activity?
Serine hydrolase activity (GO:0017171) is a molecular function where an enzyme uses a catalytic triad containing a serine nucleophile to hydrolyze substrates [1, 3].
What genes are involved in serine hydrolase activity?
Genes encoding serine hydrolases include LTA4H, ABHD2, PSD-95, MAP4K2, ACHE, BCHE, CES1, CES2, and many proteases like PRSS1 and ELANE [2, 4, 5, 7].
How is serine hydrolase activity measured?
Common methods include activity-based protein profiling (ABPP), radiometric assays, fluorescent substrate assays, and in-gel activity assays [1, 2, 5, 8].
What diseases are associated with serine hydrolases?
Serine hydrolases are linked to cancer, neurodegenerative diseases, inflammatory disorders, and infectious diseases such as tuberculosis [3, 4, 5, 7].
What is the catalytic triad in serine hydrolases?
The catalytic triad consists of a serine nucleophile, an acidic residue (aspartate or glutamate), and a histidine base [1, 3].
Can CRISPR be used to study serine hydrolases?
Yes, CRISPR knockout, point mutation, and knock-in models are widely used to study the function of serine hydrolases in cells and animals [4, 6].
What is activity-based protein profiling (ABPP)?
ABPP uses chemical probes to label active serine hydrolases, allowing their activities to be monitored in complex samples [2, 8].
How does serine hydrolase activity relate to autophagy?
MAP4K2, a serine/threonine kinase, connects the Hippo pathway to autophagy in response to energy stress, illustrating crosstalk.
What is the role of LTA4H in inflammation?
Leukotriene A4 hydrolase converts LTA4 to LTB4, a potent inflammatory mediator; its activity is regulated by serine-415.
How can I generate a knockout of a serine hydrolase gene?
EDITGENE provides custom CRISPR knockout services for any serine hydrolase gene, with validated sgRNAs and clonal cell lines [3, 4].
Conclusion
Serine hydrolase activity (GO:0017171) represents a fundamental and diverse enzymatic function with critical roles in health and disease. Understanding the mechanisms, regulation, and disease relevance of serine hydrolases requires robust experimental models and activity profiling tools. EDITGENE's comprehensive CRISPR services empower researchers to dissect the specific functions of serine hydrolases and accelerate the development of targeted therapies.
References
- 1. Goss AL et al.. 2024. Shifting Mycobacterial Serine Hydrolase Activity Visualized Using Multi-Layer In-Gel Activity Assays.. Molecules 29(14) PMID: 39064965
- 2. Navarrete M et al.. 2018. Activity-Based Protein Profiling of Intraoperative Serine Hydrolase Activities during Cardiac Surgery.. J Proteome Res 17(10):3547-3556 PMID: 30192561
- 3. Ortega C et al.. 2016. Systematic Survey of Serine Hydrolase Activity in Mycobacterium tuberculosis Defines Changes Associated with Persistence.. Cell Chem Biol 23(2):290-298 PMID: 26853625
- 4. Yokoi N et al.. 2016. Identification of PSD-95 Depalmitoylating Enzymes.. J Neurosci 36(24):6431-44 PMID: 27307232
- 5. Fazio D et al.. 2023. Radiometric Assay of ABHD2 Activity.. Methods Mol Biol 2576:299-305 PMID: 36152197
- 6. Seo G et al.. 2024. MAP4K2 connects the Hippo pathway to autophagy in response to energy stress.. Autophagy 20(3):704-706 PMID: 37937799
- 7. Rybina IV et al.. 1999. Alteration of human leukotriene A4 hydrolase activity after site-directed mutagenesis: serine-415 is a regulatory residue.. Biochim Biophys Acta 1438(2):199-203 PMID: 10320802
- 8. Wang C et al.. 2019. Discovery and Evaluation of New Activity-Based Probes for Serine Hydrolases.. Chembiochem 20(17):2212-2216 PMID: 30968522
