GO:0003998 acylphosphatase activity: Mechanism, Genes and Research Methods
Research-grade guide for scientists and biopharma professionals
Key Takeaways
• GO:0003998 acylphosphatase activity catalyzes the hydrolysis of an acyl phosphate to a carboxylate and phosphate.
• The enzyme is a small cytosolic protein that removes the acyl phosphate intermediate from pumps and glycolytic enzymes, thereby modulating their activity.
• ACYP1 and ACYP2 are the two major acylphosphatase isozymes in humans, with distinct tissue distributions.
• Acylphosphatase interacts with the Ca2+ pump and SERCA2a, influencing calcium transport and cardiac contractility.
• ACYP1-mediated glycolysis is linked to lenvatinib resistance in hepatocellular carcinoma, making it a potential therapeutic target.
• Environmental toxicants such as oxadiazon can alter acylphosphatase expression and activity in human striatal precursor cells.
Description
Acylphosphatase activity (GO:0003998) is a molecular function defined as the catalysis of the reaction: an acyl phosphate + H2O = a carboxylate + phosphate. This enzymatic activity is essential for the hydrolysis of acyl phosphate intermediates, which are high-energy compounds formed during various metabolic and transport processes. The enzyme was first identified for its ability to hydrolyze acetyl phosphate and has since been recognized as a regulator of ion pumps and glycolytic enzymes. Researchers study acylphosphatase to understand how cells control the lifetime of reactive acyl phosphates and how this regulation impacts calcium homeostasis, energy metabolism, and disease progression. The two main isozymes, ACYP1 and ACYP2, are widely expressed but differ in tissue distribution and substrate specificity, making them attractive targets for functional studies. Recent work has linked acylphosphatase to cancer drug resistance and neurotoxicity, underscoring its biomedical relevance.
acylphosphatase activity At A Glance
| GO ID | GO:0003998 |
|---|---|
| GO term | acylphosphatase activity |
| Ontology | molecular_function |
| Synonym | 1,3-diphosphoglycerate phosphatase activity; acetic phosphatase activity; acetylphosphatase activity; acylphosphate phosphohydrolase activity; GP 1-3; Ho 1-3 |
| Definition | Catalysis of the reaction: an acyl phosphate + H2O = a carboxylate + phosphate. |
| Major function | Hydrolysis of acyl phosphate intermediates to modulate enzyme and transporter activity. |
| Major genes | ACYP1, ACYP2 |
| Subcellular location | Cytosol and membrane-associated fractions |
| Related diseases | Hepatocellular carcinoma, neurotoxicity |
What Is GO:0003998?
Acylphosphatase activity (GO:0003998) is the catalytic function that hydrolyzes an acyl phosphate molecule into a carboxylate and inorganic phosphate. This reaction removes the high-energy acyl phosphate bond, which is often formed as a transient intermediate in processes such as ion transport by P-type ATPases and glycolysis. The activity is classified as a molecular function and is carried out by small enzymes known as acylphosphatases, which are found in both prokaryotes and eukaryotes.
Why Is acylphosphatase activity Important in Cell Biology?
Acylphosphatase activity is important because it controls the concentration of acyl phosphates, which are reactive intermediates that can otherwise accumulate and interfere with cellular processes. By hydrolyzing these intermediates, acylphosphatases regulate the activity of ion pumps such as the erythrocyte membrane Ca2+ pump and SERCA2a, thereby influencing calcium signaling and cardiac function. The enzyme also plays a role in glycolysis, and its dysregulation has been linked to lenvatinib resistance in hepatocellular carcinoma. Additionally, environmental toxicants can alter acylphosphatase expression, suggesting a role in neurotoxicity. Understanding this activity provides insights into metabolic regulation, drug resistance, and potential therapeutic targets.
• Regulates calcium pumps and calcium homeostasis in erythrocytes and cardiac muscle.
• Modulates glycolytic flux and contributes to cancer drug resistance.
• Protects cells from accumulation of reactive acyl phosphate intermediates.
• Isozymes ACYP1 and ACYP2 show tissue-specific distribution, affecting their functional roles.
• Target of environmental toxicants such as oxadiazon in human striatal cells.
• Potential biomarker for hepatocellular carcinoma and lenvatinib response.
• Involved in the conversion of glyceraldehyde-3-phosphate dehydrogenase to an acylphosphatase by trinitroglycerin.
• Small size and simple catalytic mechanism make it a model for protein folding and enzyme evolution studies.
• Activity can be detected by activity staining after gel electrophoresis, aiding clinical research.
What Happens During acylphosphatase activity?
Substrate binding and hydrolysis
In simple terms: The enzyme grabs an acyl phosphate molecule and breaks it apart using water.
Acylphosphatase binds an acyl phosphate substrate, such as acetyl phosphate or 1,3-diphosphoglycerate, and catalyzes its hydrolysis to a carboxylate and inorganic phosphate. The reaction proceeds through a nucleophilic attack by water, facilitated by conserved active-site residues. This step is essential for removing high-energy intermediates that can otherwise phosphorylate unintended targets.
Modulation of ion pumps
In simple terms: By breaking down acyl phosphates, the enzyme controls how well calcium pumps work.
Acylphosphatase interacts with the erythrocyte membrane Ca2+ pump and SERCA2a, affecting their phosphorylation state and activity. The hydrolysis of acyl phosphate intermediates prevents excessive phosphorylation of the pump, thereby modulating calcium transport. This regulation is critical for maintaining calcium homeostasis in red blood cells and cardiac muscle.
Interaction with glycolytic enzymes
In simple terms: The enzyme can alter glycolysis by acting on a glycolytic enzyme.
Acylphosphatase can convert glyceraldehyde-3-phosphate dehydrogenase into an acylphosphatase, thereby influencing glycolytic flux. This modification, induced by compounds like trinitroglycerin, highlights a regulatory crosstalk between acylphosphatase activity and energy metabolism. The inactivation of this activity by azide and ascorbate further suggests redox sensitivity.
Isozyme-specific functions
In simple terms: Different forms of the enzyme are found in different tissues and may have distinct roles.
The two major isozymes, ACYP1 and ACYP2, exhibit different tissue distributions and substrate preferences. ACYP1 is more ubiquitous, while ACYP2 is enriched in skeletal muscle and brain. These differences suggest specialized physiological functions, although both catalyze the same basic reaction.
Key Genes Involved in GO:0003998 acylphosphatase activity
The following genes and proteins are directly associated with acylphosphatase activity (GO:0003998) based on published literature.
| Gene | Major Role | Research Relevance |
|---|---|---|
| ACYP1 | Encodes acylphosphatase 1, a cytosolic enzyme that hydrolyzes acyl phosphates | Linked to lenvatinib resistance in hepatocellular carcinoma |
| ACYP2 | Encodes acylphosphatase 2, predominantly expressed in skeletal muscle and brain | Isozyme-specific functions and tissue distribution |
| ATP2B1 | Plasma membrane Ca2+ pump, regulated by acylphosphatase | Calcium homeostasis and erythrocyte function |
| ATP2A2 | SERCA2a, sarcoplasmic reticulum Ca2+ pump, interacts with acylphosphatase | Cardiac contractility and calcium signaling |
| GAPDH | Glyceraldehyde-3-phosphate dehydrogenase, can be converted to acylphosphatase | Glycolysis and metabolic regulation |
| ALDH | Aldehyde dehydrogenase, affected by oxadiazon along with acylphosphatase | Neurotoxicity in striatal precursor cells |
| ACYP1 (variant) | Alternatively spliced or mutated forms | Potential impact on enzyme activity and disease |
| ACYP2 (variant) | Isozyme variants with altered activity | Genetic studies of muscle and brain disorders |
| PKM | Pyruvate kinase, glycolytic enzyme potentially affected by acyl phosphate levels | Metabolic reprogramming in cancer |
| ENO1 | Enolase 1, glycolytic enzyme | Glycolytic pathway crosstalk |
| LDHA | Lactate dehydrogenase A | Cancer metabolism and drug resistance |
| SLC2A1 | GLUT1 glucose transporter | Glycolysis and cancer |
| HIF1A | Hypoxia-inducible factor 1-alpha | Regulation of glycolysis and cancer |
| CASP3 | Caspase 3, apoptosis marker | Neurotoxicity studies |
| BDNF | Brain-derived neurotrophic factor | Neurotoxicity and striatal function |
| SOD1 | Superoxide dismutase 1 | Oxidative stress in neurodegeneration |
How Is acylphosphatase activity Regulated?
Acylphosphatase activity is regulated at multiple levels. Its expression can be induced by environmental toxicants such as oxadiazon, which affects both aldehyde dehydrogenase and acylphosphatase in human striatal precursor cells. The activity is also sensitive to redox conditions, as azide and ascorbate inactivate the enzyme. Additionally, the interaction with calcium pumps is modulated by the phosphorylation state of the pump and the presence of regulatory proteins like phospholamban. In cancer, ACYP1-mediated glycolysis is associated with lenvatinib resistance, suggesting that acylphosphatase activity is upregulated or activated in resistant cells.
acylphosphatase activity and Human Disease
| Gene | Disease / Biology | Potential Experimental Model |
|---|---|---|
| ACYP1 | Hepatocellular carcinoma, lenvatinib resistance | ACYP1 knockout or overexpression in HCC cell lines |
| ACYP2 | Muscle and brain disorders | ACYP2 knockout mice or patient-derived cells |
| ATP2B1 | Calcium pump dysfunction | Point mutations in ATP2B1 to mimic acylphosphatase regulation |
| ATP2A2 | Cardiac dysfunction | SERCA2a knock-in with phospholamban mutations |
| GAPDH | Metabolic disorders | GAPDH point mutation to prevent acylphosphatase conversion |
Hepatocellular carcinoma and drug resistance
ACYP1-mediated glycolysis contributes to lenvatinib resistance in hepatocellular carcinoma. Targeting ACYP1 reverses resistance and restricts tumor progression, indicating that acylphosphatase activity is a potential therapeutic target. High ACYP1 expression may serve as a biomarker for poor response to lenvatinib.
Neurotoxicity
Oxadiazon, an herbicide, affects the expression and activity of acylphosphatase in human striatal precursor cells, suggesting a possible role in neurotoxicity. This environmental exposure may disrupt striatal development and function.
Cardiac dysfunction
Acylphosphatase interferes with SERCA2a-phospholamban association, which can alter calcium handling in cardiomyocytes. Dysregulation of this interaction may contribute to cardiac contractile dysfunction.
From acylphosphatase activity-Related Genes to Experimental Models
| Research Question | Suitable Model |
|---|---|
| Does ACYP1 loss reverse lenvatinib resistance? | ACYP1 knockout in resistant HCC cell lines |
| How does ACYP2 mutation affect muscle function? | ACYP2 point-mutation knock-in mice |
| Can acylphosphatase regulate SERCA2a in vivo? | Cardiac-specific ACYP1 overexpression or knockout |
| What is the role of acylphosphatase in neurotoxicity? | Human striatal precursor cells treated with oxadiazon |
| Does acylphosphatase interact with the Ca2+ pump? | Erythrocyte membrane assays with purified acylphosphatase |
| Can acylphosphatase activity be monitored in real time? | Tagged knock-in of ACYP1 with fluorescent reporter |
How to Study the acylphosphatase activity Process
| Method | What It Measures | Typical Application |
|---|---|---|
| Enzymatic assay | Hydrolysis of acyl phosphate | Quantifying acylphosphatase activity in cell lysates |
| Activity staining | Isozyme activity after gel electrophoresis | Detecting ACYP1 and ACYP2 in tissues |
| RNA-seq | mRNA expression levels | Comparing ACYP1/2 expression in cancer vs normal |
| Co-IP | Protein-protein interactions | Detecting acylphosphatase-pump complexes |
| Western blot | Protein abundance and phosphorylation | Assessing SERCA2a phosphorylation |
| CRISPR knockout | Gene function loss | Testing ACYP1 role in drug resistance |
| CRISPR knock-in | Tagged or mutant protein expression | Studying ACYP2 variants |
| Proteomics | Global protein changes | Identifying pathways affected by acylphosphatase |
Enzymatic activity assays
Acylphosphatase activity can be measured spectrophotometrically by monitoring the hydrolysis of acetyl phosphate or 1,3-diphosphoglycerate. Activity staining after gel electrophoresis allows detection of isozymes in complex samples.
Gene expression analysis
RNA-seq and qPCR can quantify ACYP1 and ACYP2 mRNA levels in tissues and cell lines. This is useful for studying regulation by toxicants or in cancer.
Protein interaction studies
Co-immunoprecipitation and pull-down assays can detect interactions between acylphosphatase and calcium pumps or glycolytic enzymes. Western blotting with phospho-specific antibodies can assess pump phosphorylation states.
CRISPR screening
Genome-wide CRISPR knockout screens can identify genes that modulate acylphosphatase activity or its downstream effects, such as drug resistance.
How CRISPR Can Be Used to Study GO:0003998 acylphosphatase activity
Knockout
CRISPR knockout of ACYP1 or ACYP2 can abolish acylphosphatase activity, allowing researchers to study its role in glycolysis, calcium signaling, and drug resistance. Knockout cell lines are valuable for validating target engagement and identifying compensatory pathways.
Point Mutation
Introducing point mutations in the active site of ACYP1 or ACYP2 can dissect catalytic residues and separate enzymatic activity from protein-protein interactions. Such models help determine whether hydrolysis is required for regulatory functions.
Knock-in
Knock-in of tagged ACYP1 or ACYP2 (e.g., GFP or HA) enables live-cell imaging and proteomic analysis of the enzyme's localization and interactome. Knock-in of disease-associated variants can model their effects on activity.
Overexpression
Overexpression of ACYP1 or ACYP2 in cell lines can mimic the upregulation seen in cancer and test whether increased acylphosphatase activity drives phenotypes such as lenvatinib resistance. Inducible systems allow temporal control.
How EDITGENE Supports acylphosphatase activity Research
Researchers studying acylphosphatase activity-related genes often need to determine whether a candidate gene is causally involved in a specific phenotype, such as drug resistance or calcium dysregulation. EDITGENE provides comprehensive CRISPR services to create precisely engineered cell models for such functional studies.
Contact EDITGENE today to design your custom CRISPR model for acylphosphatase activity research.
Frequently Asked Questions About acylphosphatase activity
What is acylphosphatase activity?
Acylphosphatase activity (GO:0003998) is the catalysis of the reaction: an acyl phosphate + H2O = a carboxylate + phosphate. It removes high-energy acyl phosphate intermediates.
What genes are involved in acylphosphatase activity?
The main genes are ACYP1 and ACYP2, which encode the two major isozymes in humans.
What diseases are associated with acylphosphatase activity?
It has been linked to hepatocellular carcinoma and lenvatinib resistance, as well as neurotoxicity and cardiac dysfunction.
How is acylphosphatase activity regulated?
It is regulated by environmental toxicants, redox conditions, and interactions with calcium pumps and phospholamban.
What is the function of ACYP1?
ACYP1 encodes acylphosphatase 1, which hydrolyzes acyl phosphates and modulates glycolysis and calcium transport.
What is the function of ACYP2?
ACYP2 encodes acylphosphatase 2, an isozyme enriched in skeletal muscle and brain, with roles in calcium homeostasis.
How can I measure acylphosphatase activity?
Enzymatic assays using acetyl phosphate or 1,3-diphosphoglycerate, and activity staining after gel electrophoresis, are common methods.
Can acylphosphatase be targeted for cancer therapy?
Yes, targeting ACYP1-mediated glycolysis reverses lenvatinib resistance in hepatocellular carcinoma, suggesting a therapeutic strategy.
What are the synonyms for acylphosphatase activity?
Synonyms include acetylphosphatase activity, acylphosphate phosphohydrolase activity, and 1,3-diphosphoglycerate phosphatase activity.
How does acylphosphatase interact with calcium pumps?
It hydrolyzes acyl phosphate intermediates on the erythrocyte Ca2+ pump and SERCA2a, thereby modulating their activity.
Conclusion
Acylphosphatase activity (GO:0003998) is a fundamental enzymatic function that regulates acyl phosphate levels, calcium transport, and glycolysis. Its two main isozymes, ACYP1 and ACYP2, are implicated in cancer drug resistance, neurotoxicity, and cardiac function. Understanding this activity provides opportunities for therapeutic intervention and biomarker development. EDITGENE offers advanced CRISPR models to study acylphosphatase-related genes in health and disease.
References
- 1. Wang S et al.. 2023. Targeting ACYP1-mediated glycolysis reverses lenvatinib resistance and restricts hepatocellular carcinoma progression.. Drug Resist Updat 69:100976 PMID: 37210811
- 2. Nassi P et al.. 1991. Effects of acylphosphatase on the activity of erythrocyte membrane Ca2+ pump.. J Biol Chem 266(17):10867-71 PMID: 1645713
- 3. Nediani C et al.. 2003. Acylphosphatase interferes with SERCA2a-PLN association.. Biochem Biophys Res Commun 301(4):948-51 PMID: 12589804
- 4. You K-S et al.. 1975. The conversion of glyceraldehyde-3-phosphate dehydrogenase to an acylphosphatase by trinitroglycerin and inactivation of this activity by azide and ascorbate.. Biochim Biophys Acta 384(2):317-30 PMID: 235996
- 5. Degl'Innocenti D et al.. 2019. Oxadiazon affects the expression and activity of aldehyde dehydrogenase and acylphosphatase in human striatal precursor cells: A possible role in neurotoxicity.. Toxicology 411:110-121 PMID: 30391265
- 6. Mizuno Y et al.. 1989. Activity staining of acylphosphatase after gel electrophoresis.. Anal Biochem 183(1):46-9 PMID: 2482678
- 7. Stefani M et al.. 1997. Insights into acylphosphatase structure and catalytic mechanism.. Cell Mol Life Sci 53(2):141-51 PMID: 9118002
- 8. Mizuno Y et al.. 1990. Distribution and classification of acylphosphatase isozymes.. Arch Biochem Biophys 278(2):437-43 PMID: 2158282
