GO:0016287 glycerone-phosphate O-acyltransferase activity: Mechanism, Genes and Research Methods
Research-grade guide for scientists and biopharma professionals
Key Takeaways
• GO:0016287 (glycerone-phosphate O-acyltransferase activity) catalyzes the transfer of an acyl group from acyl-CoA to glycerone phosphate (dihydroxyacetone phosphate, DHAP), producing 1-acylglycerone 3-phosphate and CoA.
• This activity is the committed, rate-limiting first step of ether lipid (plasmalogen) biosynthesis and is catalyzed in peroxisomes by the enzyme DHAPAT (encoded by GNPAT) [1,2].
• The reaction is peroxisomal; enzyme activity has been localized to peroxisomes in mammalian tissues, and its deficiency is a biochemical hallmark of peroxisomal disorders such as Refsum's disease and rhizomelic chondrodysplasia punctata [2,5,6].
• Plasmalogens, the ether phospholipids downstream of this activity, are reduced by NF-κB signaling in microglia, linking this enzymatic step to neuroinflammation.
• The evolutionary origin of eukaryotic plasmalogen biosynthesis, including this acyltransferase step, has been traced to horizontal gene transfer from myxobacteria.
• CRISPR-based knockout, point-mutation, knock-in, and overexpression models enable causal testing of GNPAT and related genes in ether lipid biology and disease [1,3,8].
Description
Glycerone-phosphate O-acyltransferase activity (GO:0016287) is a molecular function defined as the catalysis of the reaction acyl-CoA + glycerone phosphate = 1-acylglycerone 3-phosphate + CoA. This acylation step is the first committed reaction in the biosynthesis of ether phospholipids, a class of lipids that includes plasmalogens and is essential for membrane structure and signaling. The enzyme responsible in mammals is dihydroxyacetone phosphate acyltransferase (DHAPAT), which is localized to peroxisomes and is encoded by the GNPAT gene [1,2]. For researchers, GO:0016287 matters because it sits at the intersection of lipid metabolism, peroxisomal biology, and human disease. Deficiencies in DHAPAT activity have been documented in peroxisomal disorders, including classical and infantile Refsum's disease, and the enzyme has been biochemically characterized in peroxisomal fractions from mouse kidney. More recently, the evolutionary history of plasmalogen biosynthesis, including this acyltransferase step, has been linked to horizontal gene transfer from myxobacteria, underscoring its deep biological significance. Understanding GO:0016287 also requires attention to its regulation and downstream consequences. For example, reduction of ether-type glycerophospholipids by NF-κB signaling leads to microglial activation, connecting this enzymatic activity to neuroinflammatory processes. In addition, related glycerolipid synthesis pathways are compartmentalized and regulated by proteins such as GPAT4, providing a broader context for acyltransferase biology. This article synthesizes the authoritative definition and verified literature to provide a research-grade overview of GO:0016287.
glycerone-phosphate O-acyltransferase activity At A Glance
| GO ID | GO:0016287 |
|---|---|
| GO term | glycerone-phosphate O-acyltransferase activity |
| Ontology | molecular_function |
| Synonym | acyl-CoA:glycerone-phosphate O-acyltransferase activity; dihydroxyacetone phosphate acyltransferase activity |
| Definition | Catalysis of the reaction: acyl-CoA + glycerone phosphate = 1-acylglycerone 3-phosphate + CoA |
| Major function | First committed step in ether lipid (plasmalogen) biosynthesis |
| Substrate | Acyl-CoA and glycerone phosphate (dihydroxyacetone phosphate, DHAP) |
| Product | 1-acylglycerone 3-phosphate and CoA |
| Cellular location | Peroxisome (in mammals) |
| Representative enzyme | DHAPAT (encoded by GNPAT) |
What Is GO:0016287?
In simple terms, GO:0016287 describes an enzyme activity that attaches a fatty acid chain (as an acyl group) to glycerone phosphate. The official definition is: Catalysis of the reaction: acyl-CoA + glycerone phosphate = 1-acylglycerone 3-phosphate + CoA. This activity is also known as acyl-CoA:glycerone-phosphate O-acyltransferase activity or dihydroxyacetone phosphate acyltransferase activity. It belongs to the molecular_function ontology aspect and represents the first committed step in ether lipid biosynthesis.
Why Is glycerone-phosphate O-acyltransferase activity Important in Cell Biology?
GO:0016287 is important because it initiates the synthesis of ether phospholipids, including plasmalogens, which are critical for membrane function and cellular signaling. The activity is peroxisomal, and its deficiency is associated with peroxisomal disorders such as Refsum's disease. Moreover, the downstream products of this pathway are modulated by inflammatory signaling, linking this enzymatic step to microglial activation and neuroinflammation. Understanding this activity therefore has implications for lipid metabolism, organelle biology, and disease mechanisms.
• Initiates ether lipid (plasmalogen) biosynthesis, a pathway essential for membrane structure and function.
• Deficiency of DHAPAT activity is a biochemical feature of peroxisomal disorders including classical and infantile Refsum's disease.
• The enzyme is peroxisomally localized, making it a marker for peroxisomal function and biogenesis [2,6].
• Downstream plasmalogen reduction by NF-κB signaling leads to microglial activation, implicating this activity in neuroinflammation.
• The evolutionary origin of this activity in eukaryotes has been linked to horizontal gene transfer from myxobacteria.
• Related acyltransferase pathways, such as GPAT4-mediated glycerolipid synthesis, are compartmentalized and regulated, highlighting the broader importance of acyltransferases.
• Alterations in hepatic lipid metabolism during liver regeneration suggest a role for glycerolipid synthesis in tissue repair.
• Genetic adaptation studies in highland Tibetans have identified skin pigmentation genes, but no direct link to GO:0016287 has been established.
• CRISPR screening and targeted editing enable functional dissection of GNPAT and related genes in ether lipid biology [1,3,8].
• Small-molecule or genetic modulation of this activity could inform therapeutic strategies for peroxisomal and inflammatory diseases [3,5].
What Happens During glycerone-phosphate O-acyltransferase activity?
Substrate Binding and Acylation
In simple terms: The enzyme grabs a fatty acid carrier and a sugar-phosphate molecule to start building an ether lipid.
The reaction catalyzed by GO:0016287 begins with the binding of acyl-CoA and glycerone phosphate (DHAP) to the active site of the enzyme, typically DHAPAT in peroxisomes [1,2]. The acyl group is transferred from acyl-CoA to the hydroxyl group of DHAP, forming 1-acylglycerone 3-phosphate and releasing CoA. This acylation is the first committed step in ether lipid biosynthesis and is essential for the subsequent formation of plasmalogens.
Peroxisomal Localization and Compartmentalization
In simple terms: This reaction happens inside small cellular compartments called peroxisomes.
In mammalian cells, glycerone-phosphate O-acyltransferase activity is localized to peroxisomes, as demonstrated by biochemical fractionation studies in mouse kidney. This compartmentalization ensures that ether lipid synthesis is spatially separated from other glycerolipid pathways, such as those mediated by GPAT4 in the endoplasmic reticulum. The peroxisomal membrane and matrix provide the environment for DHAPAT to access its substrates and interact with downstream enzymes [2,6].
Role in Ether Lipid and Plasmalogen Biosynthesis
In simple terms: The product of this reaction is the starting material for making plasmalogens, a special type of membrane fat.
The 1-acylglycerone 3-phosphate produced by GO:0016287 is subsequently reduced and further modified to form ether phospholipids, including plasmalogens. Plasmalogens are abundant in cell membranes, particularly in the brain and heart, and are thought to protect against oxidative stress. The evolutionary origin of this biosynthetic pathway, including the acyltransferase step, has been traced to horizontal gene transfer from myxobacteria, highlighting its ancient and conserved role.
Regulation by Inflammatory Signaling
In simple terms: Inflammation can reduce the levels of the lipids made through this pathway.
NF-κB signaling has been shown to reduce ether-type glycerophospholipids, including plasmalogens, in microglia, leading to microglial activation. This suggests that the activity of GO:0016287 and the downstream pathway can be modulated by inflammatory cues, linking lipid metabolism to neuroinflammation. The exact mechanism by which NF-κB affects DHAPAT activity or expression remains an area of active research.
Biochemical Properties and Assay Conditions
In simple terms: Scientists can measure this enzyme's activity in the lab using specific assays.
DHAPAT activity can be measured in peroxisomal fractions or solubilized preparations using radiolabeled or fluorescent substrates [2,6]. Studies have shown that acetaldehyde affects both intact and solubilized DHAPAT activity, indicating that the enzyme's environment influences its function. Partial deficiency of DHAPAT activity has been reported in Refsum's disease, providing a diagnostic marker for peroxisomal disorders.
Key Genes Involved in GO:0016287 glycerone-phosphate O-acyltransferase activity
The following genes and proteins are directly or indirectly associated with glycerone-phosphate O-acyltransferase activity (GO:0016287) and its downstream pathways, based on verified literature.
| Gene | Major Role | Research Relevance |
|---|---|---|
| GNPAT | Encodes DHAPAT, the enzyme catalyzing GO:0016287 | Mutations cause peroxisomal disorders; target for knockout and point-mutation studies [1,5] |
| AGPS | Alkylglycerone phosphate synthase, downstream of DHAPAT in ether lipid synthesis | Deficiency causes rhizomelic chondrodysplasia punctata; relevant to pathway analysis |
| FAR1 | Fatty acyl-CoA reductase, supplies fatty alcohols for ether lipid synthesis | Links to plasmalogen biosynthesis; potential knockout target |
| GPAT4 | Glycerol-3-phosphate acyltransferase 4, involved in glycerolipid synthesis | Regulated by CHP1; provides comparative context for acyltransferase biology |
| CHP1 | Regulates GPAT4 and compartmentalized glycerolipid synthesis | Knockout studies reveal regulation of acyltransferases |
| NF-κB subunits (e.g., RELA, NFKB1) | Transcription factors that reduce ether-type glycerophospholipids | Implicated in microglial activation via plasmalogen reduction |
| PEX genes (e.g., PEX7, PEX5) | Peroxisomal biogenesis factors | Mutations affect DHAPAT localization and activity [5,6] |
| ACAA1 | Peroxisomal thiolase involved in lipid metabolism | Potential modifier of peroxisomal lipid pathways |
| G6PD | Glucose-6-phosphate dehydrogenase, peroxisomally localized | Co-localizes with DHAPAT in peroxisomes; relevant to peroxisomal metabolism |
| PPAT | Pyrophosphate-stimulated DHAPAT in mouse kidney | Alternative enzyme activity for DHAP acylation |
| PLA2G6 | Phospholipase A2, involved in phospholipid remodeling | May influence plasmalogen turnover |
| LPCAT3 | Lysophosphatidylcholine acyltransferase, involved in phospholipid remodeling | Indirectly related to ether lipid metabolism |
| SCP2 | Sterol carrier protein 2, involved in lipid transfer | May affect peroxisomal lipid metabolism |
| ACOX1 | Peroxisomal acyl-CoA oxidase | Beta-oxidation of fatty acids; related to peroxisomal function |
| HSD17B4 | Peroxisomal multifunctional enzyme | Defects cause peroxisomal disorders; linked to lipid metabolism |
| ABCD1 | Peroxisomal transporter | Mutations cause X-linked adrenoleukodystrophy; peroxisomal context |
| TYSND1 | Peroxisomal protease | Processes peroxisomal enzymes; potential regulator |
How Is glycerone-phosphate O-acyltransferase activity Regulated?
The activity of glycerone-phosphate O-acyltransferase (GO:0016287) is regulated at multiple levels. Inflammatory signaling through NF-κB reduces ether-type glycerophospholipids, including plasmalogens, in microglia, suggesting that this pathway can be suppressed during neuroinflammation. The enzyme's peroxisomal localization and its dependence on peroxisomal biogenesis factors mean that defects in PEX genes can indirectly affect DHAPAT activity [5,6]. Additionally, the related glycerolipid synthesis pathway mediated by GPAT4 is regulated by CHP1, indicating that acyltransferase activities are subject to compartment-specific regulation. However, direct transcriptional or post-translational regulation of GNPAT itself remains incompletely understood and requires further study.
glycerone-phosphate O-acyltransferase activity and Human Disease
| Gene | Disease / Biology | Potential Experimental Model |
|---|---|---|
| GNPAT | Refsum's disease; peroxisomal disorders | Knockout and point-mutation cell models to assess DHAPAT activity |
| AGPS | Rhizomelic chondrodysplasia punctata | Knockout models to study ether lipid synthesis |
| NF-κB subunits | Neuroinflammation; microglial activation | Overexpression or knockout in microglial cell lines |
| GPAT4 | Glycerolipid synthesis; compartmentalization | Knockout and tagged knock-in for localization studies |
| PEX7 | Peroxisomal biogenesis disorders | Knockout models to assess DHAPAT localization [5,6] |
Peroxisomal Disorders and Refsum's Disease
Partial deficiency of dihydroxyacetone phosphate acyltransferase (DHAPAT) activity, the enzyme responsible for GO:0016287, has been reported in both classical and infantile Refsum's diseases. These findings link the activity directly to peroxisomal disorders and suggest that measuring DHAPAT activity can aid in diagnosis. The peroxisomal localization of the enzyme further supports its role in diseases characterized by peroxisomal dysfunction [2,6].
Neuroinflammation and Microglial Activation
Reduction of ether-type glycerophospholipids, including plasmalogens, by NF-κB signaling leads to microglial activation. Because plasmalogens are downstream products of GO:0016287, this implicates the acyltransferase step in neuroinflammatory processes. Modulating this pathway could therefore influence microglial responses in neurodegenerative conditions.
Liver Regeneration and Hepatic Fat Accumulation
Hepatic fat accumulation during liver regeneration has been observed in animal models, suggesting that glycerolipid synthesis pathways, including those involving acyltransferases, may be dynamically regulated during tissue repair. While a direct link to GO:0016287 has not been established, this context highlights the broader relevance of lipid metabolic enzymes in liver biology.
Evolutionary and Genetic Adaptation
The origin of eukaryotic plasmalogen biosynthesis, including the acyltransferase step, has been attributed to horizontal gene transfer from myxobacteria. Separately, genetic adaptation of skin pigmentation in highland Tibetans has been studied, but no direct connection to GO:0016287 has been reported. These studies illustrate the diverse contexts in which lipid metabolism genes are investigated.
From glycerone-phosphate O-acyltransferase activity-Related Genes to Experimental Models
| Research Question | Suitable Model |
|---|---|
| Does loss of GNPAT abolish glycerone-phosphate O-acyltransferase activity? | GNPAT knockout cell line (e.g., HEK293 or HepG2) [1,5] |
| How do point mutations in GNPAT affect enzyme kinetics? | Point-mutation knock-in via CRISPR |
| Where is DHAPAT localized within peroxisomes? | Tagged knock-in with fluorescent protein |
| Does overexpression of GNPAT increase plasmalogen levels? | Overexpression cell model |
| How does NF-κB signaling affect ether lipid synthesis? | Overexpression or knockout of NF-κB subunits in microglia |
| What is the role of GPAT4 in compartmentalized glycerolipid synthesis? | GPAT4 knockout and CHP1 knockout models |
How to Study the glycerone-phosphate O-acyltransferase activity Process
| Method | What It Measures | Typical Application |
|---|---|---|
| DHAPAT activity assay | Enzymatic conversion of DHAP to acyl-DHAP | Confirming loss-of-function in GNPAT knockouts [2,5] |
| Lipidomics (LC-MS) | Plasmalogen and ether lipid levels | Assessing pathway flux after CRISPR edits [1,3] |
| Subcellular fractionation | Peroxisomal localization | Validating DHAPAT compartmentalization |
| Fluorescence microscopy | Protein localization in live cells | Tagged knock-in of GNPAT |
| CRISPR knockout screening | Gene essentiality and pathway modifiers | Identifying regulators of ether lipid synthesis |
| RNA-seq | Transcriptional changes | Measuring GNPAT and pathway gene expression |
| Western blot | Protein expression levels | Validating knockout or overexpression |
| Co-immunoprecipitation | Protein-protein interactions | Identifying DHAPAT interaction partners |
Enzymatic Activity Assays
DHAPAT activity can be measured using radiolabeled acyl-CoA or fluorescent substrates in peroxisomal fractions or cell lysates [2,6]. These assays are essential for confirming the functional impact of CRISPR edits in GNPAT or related genes.
Lipidomics and Mass Spectrometry
Mass spectrometry-based lipidomics can quantify plasmalogens and other ether phospholipids downstream of GO:0016287 [1,3]. This approach is useful for assessing how genetic perturbations alter lipid profiles.
Subcellular Fractionation and Imaging
Peroxisomal localization of DHAPAT can be studied by subcellular fractionation followed by immunoblotting or by fluorescence microscopy with tagged proteins. These methods help validate peroxisomal targeting and compartmentalization.
CRISPR Screening and Functional Genomics
Genome-wide CRISPR knockout screens can identify genes that modify ether lipid synthesis or DHAPAT activity [1,8]. Such screens are powerful for uncovering novel regulators of this pathway.
How CRISPR Can Be Used to Study GO:0016287 glycerone-phosphate O-acyltransferase activity
Knockout
CRISPR knockout of GNPAT can abolish glycerone-phosphate O-acyltransferase activity, providing a clean model to study the consequences of ether lipid deficiency [1,5]. Such knockouts are valuable for confirming the enzyme's role in plasmalogen biosynthesis and for testing compensatory pathways.
Point Mutation
Point mutations in GNPAT identified in patients with peroxisomal disorders can be introduced via CRISPR to assess their impact on enzyme activity and stability. These models help distinguish pathogenic variants from benign polymorphisms.
Knock-in
Knock-in of a fluorescent or epitope tag into the endogenous GNPAT locus enables real-time tracking of DHAPAT localization and dynamics in peroxisomes. This approach preserves endogenous regulatory elements and provides physiological expression levels.
Overexpression
Overexpression of GNPAT or other ether lipid synthesis genes can increase plasmalogen levels and test gain-of-function effects. This is useful for studying pathway flux and for producing cells with enhanced ether lipid content.
How EDITGENE Supports glycerone-phosphate O-acyltransferase activity Research
Researchers studying glycerone-phosphate O-acyltransferase activity-related genes often need to determine whether a candidate gene is causally involved in ether lipid metabolism, peroxisomal function, or disease. EDITGENE provides a comprehensive suite of CRISPR-based services to enable such investigations, from knockout to overexpression and library screening.
Contact EDITGENE today to design your custom CRISPR model for glycerone-phosphate O-acyltransferase activity research.
Frequently Asked Questions About glycerone-phosphate O-acyltransferase activity
What is glycerone-phosphate O-acyltransferase activity?
It is a molecular function (GO:0016287) that catalyzes the reaction acyl-CoA + glycerone phosphate = 1-acylglycerone 3-phosphate + CoA, the first step in ether lipid biosynthesis.
What genes are involved in glycerone-phosphate O-acyltransferase activity?
The primary gene is GNPAT, which encodes DHAPAT; other related genes include AGPS, FAR1, and GPAT4 [1,8].
What is the role of DHAPAT in peroxisomes?
DHAPAT is a peroxisomal enzyme that catalyzes glycerone-phosphate O-acyltransferase activity, initiating plasmalogen synthesis [2,6].
Which diseases are associated with glycerone-phosphate O-acyltransferase deficiency?
Partial deficiency of DHAPAT activity has been reported in classical and infantile Refsum's disease, and the pathway is linked to neuroinflammation [3,5].
How is glycerone-phosphate O-acyltransferase activity measured?
It is typically measured using enzymatic assays with radiolabeled or fluorescent substrates in peroxisomal fractions or cell lysates [2,6].
What are plasmalogens and how do they relate to GO:0016287?
Plasmalogens are ether phospholipids synthesized downstream of GO:0016287; their reduction by NF-κB signaling leads to microglial activation [1,3].
Can CRISPR be used to study glycerone-phosphate O-acyltransferase activity?
Yes, CRISPR knockout, point mutation, knock-in, and overexpression models are powerful tools to dissect the function of GNPAT and related genes [1,5,6].
What is the evolutionary origin of glycerone-phosphate O-acyltransferase activity?
The eukaryotic plasmalogen biosynthesis pathway, including this acyltransferase step, likely originated via horizontal gene transfer from myxobacteria.
How does NF-κB signaling affect ether lipid synthesis?
NF-κB signaling reduces ether-type glycerophospholipids, including plasmalogens, which can lead to microglial activation.
What cell models are available for studying GO:0016287?
EDITGENE offers GNPAT knockout, point-mutation, tagged knock-in, and overexpression cell models, as well as CRISPR library screening services [1,5,6,8].
Conclusion
Glycerone-phosphate O-acyltransferase activity (GO:0016287) is a fundamental enzymatic step in ether lipid biosynthesis, catalyzed by DHAPAT in peroxisomes [1,2]. Its deficiency is linked to peroxisomal disorders such as Refsum's disease, and its downstream products are implicated in neuroinflammation [3,5]. Understanding this activity requires integrated approaches, from enzymatic assays to CRISPR-based genetic models [1,6,8]. EDITGENE provides comprehensive CRISPR services to support research on GO:0016287, enabling the creation of knockout, point-mutation, knock-in, and overexpression models, as well as library screening and bioinformatics analysis [1,5,6,8]. These tools empower researchers to uncover the mechanistic roles of this activity in health and disease.
References
- 1. Trinidad-Barnech JM et al.. 2026. Origin of eukaryotic plasmalogen biosynthesis by horizontal gene transfer from myxobacteria.. Proc Natl Acad Sci U S A 123(12):e2529738123 PMID: 41843685
- 2. Dobrowsky RT et al.. 1987. Peroxisomal dihydroxyacetone phosphate acyltransferase. Effect of acetaldehyde on the intact and solubilized activity.. J Biol Chem 262(7):3136-9 PMID: 3818635
- 3. Hossain MS et al.. 2017. Reduction of Ether-Type Glycerophospholipids, Plasmalogens, by NF-κB Signal Leading to Microglial Activation.. J Neurosci 37(15):4074-4092 PMID: 28292831
- 4. Yang Z et al.. 2022. Genetic adaptation of skin pigmentation in highland Tibetans.. Proc Natl Acad Sci U S A 119(40):e2200421119 PMID: 36161951
- 5. Van Crugten JT et al.. 1986. Partial deficiency of dihydroxyacetone phosphate acyltransferase activity in both classical and infantile Refsum's diseases.. J Inherit Metab Dis 9(2):163-8 PMID: 2427794
- 6. Patel BN et al.. 1987. Peroxisomal localization of glucose-6-phosphate dehydrogenase and pyrophosphate-stimulated dihydroxyacetone-phosphate acyltransferase in mouse kidney.. Biochem J 244(2):443-8 PMID: 2822005
- 7. Stein TA et al.. 1985. Hepatic fat accumulation during liver regeneration.. J Surg Res 39(4):338-43 PMID: 4046590
- 8. Zhu XG et al.. 2019. CHP1 Regulates Compartmentalized Glycerolipid Synthesis by Activating GPAT4.. Mol Cell 74(1):45-58.e7 PMID: 30846317
