GO:0047408 alkenylglycerophosphocholine hydrolase activity: Mechanism, Genes and Research Methods
Research-grade guide for scientists and biopharma professionals
Key Takeaways
• GO:0047408 (alkenylglycerophosphocholine hydrolase activity) catalyzes the hydrolysis of 1-(1-alkenyl)-sn-glycero-3-phosphocholine to L-1-glycero-3-phosphocholine and an aldehyde.
• This enzyme activity, also known as lysoplasmalogenase, is a key step in plasmalogen catabolism and controls the levels of lysoplasmalogens and fatty aldehydes.
• The reaction is important for membrane homeostasis and for generating lipid signaling molecules such as fatty aldehydes and lysophospholipids.
• TMEM86A and TMEM86B are mammalian lysoplasmalogenases, and TMEM86A is regulated by LXR signaling in macrophages.
• Bacterial YhhN family proteins, including those from Legionella pneumophila and Mycobacterium tuberculosis, possess lysoplasmalogenase activity and protect against toxic lysolipids.
• Dysregulation of this activity has been linked to cardiovascular and neurodegenerative conditions, making it a potential therapeutic target.
Description
Alkenylglycerophosphocholine hydrolase activity (GO:0047408) is a molecular function that removes the alkenyl ether bond of plasmalogens, a class of ether phospholipids abundant in cell membranes. This activity is essential for the turnover of plasmalogens and for the production of lipid second messengers such as fatty aldehydes and lysophosphatidylcholine. Researchers study this activity to understand membrane lipid remodeling, cellular signaling, and the pathogenesis of diseases ranging from atherosclerosis to neurodegeneration.
alkenylglycerophosphocholine hydrolase activity At A Glance
| GO ID | GO:0047408 |
|---|---|
| GO term | alkenylglycerophosphocholine hydrolase activity |
| Ontology | molecular_function |
| Synonym | lysoplasmalogenase activity; 1-(1-alkenyl)-sn-glycero-3-phosphocholine aldehydohydrolase activity |
| Major function | Hydrolysis of the alkenyl ether bond in lysoplasmalogens, producing a fatty aldehyde and L-1-glycero-3-phosphocholine |
| Substrates | 1-(1-alkenyl)-sn-glycero-3-phosphocholine (lysoplasmalogen) and water |
| Products | L-1-glycero-3-phosphocholine and an aldehyde |
| Cellular location | Membrane-associated, particularly microsomal fractions in mammalian tissues |
| Representative genes | TMEM86A, TMEM86B in mammals; YhhN in bacteria |
What Is GO:0047408?
According to the Gene Ontology, GO:0047408 is defined as the catalysis of the reaction: H2O + 1-(1-alkenyl)-sn-glycero-3-phosphocholine = L-1-glycero-3-phosphocholine + an aldehyde. In simpler terms, it is an enzyme activity that cleaves the vinyl ether bond of a lysoplasmalogen (a plasmalogen lacking one acyl chain), releasing a fatty aldehyde and glycerophosphocholine.
Why Is alkenylglycerophosphocholine hydrolase activity Important in Cell Biology?
GO:0047408 is critical for maintaining the balance between plasmalogens and their breakdown products. Plasmalogens are major constituents of cell membranes, and their catabolism via this activity generates fatty aldehydes that can act as signaling molecules or be further metabolized. Dysregulation of this activity has been implicated in cardiovascular diseases, where altered plasmalogen metabolism affects membrane integrity and lipid signaling. In addition, bacterial lysoplasmalogenases of the YhhN family contribute to host-pathogen interactions by detoxifying host lysolipids.
• Controls plasmalogen turnover and membrane lipid composition.
• Generates fatty aldehydes, which can serve as signaling molecules or substrates for further metabolism.
• Regulates levels of lysoplasmalogens, which can be toxic if accumulated.
• Linked to cardiovascular disease through altered plasmenylcholine catabolism in the heart.
• Involved in macrophage lipid metabolism and LXR signaling.
• Bacterial lysoplasmalogenases protect against host-derived toxic lysolipids.
• Potential target for modulating inflammation and atherosclerosis.
• Provides a mechanism for detoxification of lysolipids in pathogens.
• Important for brain lipid metabolism, as alkenylhydrolase activity is present in brain microsomes.
• May influence ferroptosis and oxidative stress through fatty aldehyde production.
What Happens During alkenylglycerophosphocholine hydrolase activity?
Substrate recognition and binding
In simple terms: The enzyme finds and grabs a specific lipid molecule called a lysoplasmalogen.
The enzyme specifically recognizes 1-(1-alkenyl)-sn-glycero-3-phosphocholine, a lysoplasmalogen that lacks an acyl chain at the sn-2 position. Binding occurs at the membrane interface, as the substrate is a lipid embedded in the membrane.
Catalytic cleavage of the vinyl ether bond
In simple terms: The enzyme cuts the special ether bond in the lipid, breaking it apart.
The catalytic mechanism involves hydrolysis of the alkenyl ether bond, resulting in the formation of a fatty aldehyde and L-1-glycero-3-phosphocholine. This reaction is specific for the vinyl ether linkage and does not act on acyl ester bonds.
Product release and downstream metabolism
In simple terms: The products are released and can be used in other cellular processes.
The released fatty aldehyde can be oxidized to a fatty acid or reduced to a fatty alcohol, and it may also act as a signaling molecule. L-1-glycero-3-phosphocholine can be further metabolized or reutilized in phospholipid synthesis.
Regulation of enzyme activity
In simple terms: The enzyme's activity can be turned up or down by cellular signals.
In macrophages, TMEM86A expression is regulated by the LXR signaling pathway, linking lysoplasmalogen levels to cholesterol metabolism. Additionally, the enzyme may be regulated by substrate availability and membrane composition.
Key Genes Involved in GO:0047408 alkenylglycerophosphocholine hydrolase activity
The following genes and proteins are known to possess or regulate alkenylglycerophosphocholine hydrolase activity.
| Gene | Major Role | Research Relevance |
|---|---|---|
| TMEM86A | Mammalian lysoplasmalogenase; hydrolyzes lysoplasmalogens | Regulated by LXR; involved in macrophage lipid metabolism |
| TMEM86B | Mammalian lysoplasmalogenase; hydrolyzes lysoplasmalogens | Potential role in plasmalogen homeostasis |
| YhhN (Legionella pneumophila) | Bacterial lysoplasmalogenase; protects against toxic lysolipids | Model for bacterial lipid detoxification |
| YhhN (Mycobacterium tuberculosis) | Bacterial lysoplasmalogenase; detoxifies host lysolipids | Potential drug target in tuberculosis |
| PLA2G6 | Phospholipase A2; generates lysoplasmalogens for hydrolysis | Links to neurodegeneration with brain iron accumulation |
| FAR1 | Fatty acyl-CoA reductase; metabolizes fatty aldehydes produced | Involved in fatty aldehyde detoxification |
| ALDH3A2 | Fatty aldehyde dehydrogenase; oxidizes fatty aldehydes | Defects cause Sjögren-Larsson syndrome |
| LXR (NR1H3) | Nuclear receptor regulating TMEM86A expression | Links lipid metabolism to inflammation |
| PPARα | Nuclear receptor; may regulate lipid metabolism genes | Potential regulator of plasmalogen catabolism |
| iPLA2 | Calcium-independent phospholipase A2; generates lysoplasmalogens | Involved in cardiac plasmenylcholine catabolism |
| cPLA2 | Cytosolic phospholipase A2; may contribute to lysoplasmalogen formation | Role in eicosanoid signaling |
| TMEM86A (human) | Human ortholog; lysoplasmalogenase | Target for modulating lysoplasmalogen levels |
| TMEM86B (human) | Human ortholog; lysoplasmalogenase | Potential biomarker in lipid disorders |
| YhhN (other bacteria) | Family of bacterial lysoplasmalogenases | Broadly conserved mechanism |
| GNPAT | Peroxisomal enzyme in plasmalogen synthesis | Indirectly affects substrate availability |
| AGPS | Peroxisomal enzyme in plasmalogen synthesis | Mutations cause plasmalogen deficiency |
| FAR1 (yeast) | Fatty aldehyde reductase | Model for aldehyde metabolism |
| ALDH2 | Mitochondrial aldehyde dehydrogenase | Metabolizes fatty aldehydes |
How Is alkenylglycerophosphocholine hydrolase activity Regulated?
Alkenylglycerophosphocholine hydrolase activity is regulated at multiple levels. In macrophages, the expression of TMEM86A is induced by LXR agonists, linking this activity to cholesterol homeostasis and inflammatory responses. Substrate availability, particularly the generation of lysoplasmalogens by phospholipase A2 enzymes, also controls flux through this pathway. Additionally, the enzyme's activity may be influenced by membrane lipid composition and post-translational modifications, though specific mechanisms remain to be fully elucidated.
alkenylglycerophosphocholine hydrolase activity and Human Disease
| Gene | Disease / Biology | Potential Experimental Model |
|---|---|---|
| TMEM86A | Atherosclerosis, macrophage lipid metabolism | Knockout mice, macrophage cell lines |
| TMEM86B | Lipid disorders, plasmalogen homeostasis | Overexpression in HEK293 cells |
| YhhN (M. tuberculosis) | Tuberculosis pathogenesis | Bacterial knockout mutants |
| PLA2G6 | Neurodegeneration with brain iron accumulation | Patient-derived fibroblasts, KO mice |
| ALDH3A2 | Sjögren-Larsson syndrome | Knockout cell models |
Cardiovascular disease
Altered plasmenylcholine catabolism, including alkenylglycerophosphocholine hydrolase activity, has been observed in cardiac tissue, and changes in this pathway may contribute to ischemic injury and heart failure. The accumulation of lysoplasmalogens can disrupt membrane integrity and promote arrhythmias.
Neurodegeneration
Plasmalogen deficiency is a hallmark of several neurodegenerative disorders, and dysregulation of lysoplasmalogenases could exacerbate this by depleting plasmalogens. In the brain, alkenylhydrolase activity is present in microsomes, and its imbalance may affect neuronal membrane function.
Infectious disease
Bacterial lysoplasmalogenases, such as those from Legionella pneumophila and Mycobacterium tuberculosis, detoxify host-derived lysolipids, contributing to pathogen survival. Inhibiting these enzymes could represent a novel antibacterial strategy.
Metabolic disorders
TMEM86A is regulated by LXR, and its activity influences lysoplasmalogen levels in macrophages, which are key players in atherosclerosis. Thus, this enzyme may link lipid metabolism to inflammation and metabolic diseases.
From alkenylglycerophosphocholine hydrolase activity-Related Genes to Experimental Models
| Research Question | Suitable Model |
|---|---|
| Does TMEM86A regulate lysoplasmalogen levels in macrophages? | TMEM86A knockout macrophages |
| What is the catalytic mechanism of TMEM86B? | Point mutations in catalytic residues followed by enzyme assay |
| Can bacterial YhhN protect against host lysolipids? | YhhN knockout bacteria in infection models |
| How does LXR signaling affect TMEM86A expression? | LXR agonist/antagonist treatment in WT and KO cells |
| What is the role of lysoplasmalogenase in cardiac function? | Cardiac-specific knockout mice |
| Does alkenylhydrolase activity change in neurodegeneration? | Brain-specific KO or overexpression models |
How to Study the alkenylglycerophosphocholine hydrolase activity Process
| Method | What It Measures | Typical Application |
|---|---|---|
| Lysoplasmalogenase assay | Enzyme activity | Characterization of TMEM86A/B mutants |
| Lipidomics (LC-MS) | Plasmalogen and lysoplasmalogen levels | Profiling in knockout cells |
| qRT-PCR | mRNA expression | LXR regulation of TMEM86A |
| Western blot | Protein levels | Validation of knockout or overexpression |
| CRISPR screen | Gene essentiality or lipid sensitivity | Identification of novel regulators |
| Immunofluorescence | Subcellular localization | Membrane association of lysoplasmalogenase |
| Aldehyde detection | Fatty aldehyde production | Enzyme kinetics |
| Knockout mouse models | In vivo function | Cardiac or metabolic phenotypes |
Enzymatic activity assays
Lysoplasmalogenase activity can be measured using a novel assay that detects the release of fatty aldehydes or the formation of L-1-glycero-3-phosphocholine. Radioactive or fluorescent substrates are often employed.
Lipidomics
Mass spectrometry-based lipidomics allows comprehensive profiling of plasmalogens and lysoplasmalogens in cells and tissues, providing insights into the flux through this pathway.
Gene expression analysis
Quantitative PCR and RNA-seq can measure the expression of TMEM86A, TMEM86B, and related genes under various conditions, such as LXR activation.
CRISPR screening
Genome-wide CRISPR knockout screens can identify genes that regulate lysoplasmalogen levels or sensitivity to lysolipid toxicity, uncovering novel components of this pathway.
How CRISPR Can Be Used to Study GO:0047408 alkenylglycerophosphocholine hydrolase activity
Knockout
CRISPR knockout of TMEM86A or TMEM86B can abolish lysoplasmalogenase activity, leading to accumulation of lysoplasmalogens and altered lipid signaling. Such models are valuable for studying the physiological consequences of loss of function.
Point Mutation
Introducing point mutations in catalytic residues of TMEM86A/B can help identify essential amino acids for hydrolase activity and distinguish between enzyme-dependent and independent functions.
Knock-in
Knock-in of tagged versions of TMEM86A/B (e.g., FLAG or GFP) allows for localization and interaction studies without altering endogenous regulation.
Overexpression
Overexpression of TMEM86A/B in cell lines can increase lysoplasmalogenase activity, reducing lysoplasmalogen levels and potentially protecting against lysolipid toxicity.
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Frequently Asked Questions About alkenylglycerophosphocholine hydrolase activity
What is alkenylglycerophosphocholine hydrolase activity?
It is an enzyme activity that hydrolyzes lysoplasmalogens to produce a fatty aldehyde and L-1-glycero-3-phosphocholine, encoded by GO:0047408.
What genes are involved in alkenylglycerophosphocholine hydrolase activity?
Key genes include TMEM86A and TMEM86B in mammals, and YhhN in bacteria such as Legionella pneumophila and Mycobacterium tuberculosis.
What is the role of TMEM86A in lipid metabolism?
TMEM86A is a lysoplasmalogenase that regulates lysoplasmalogen levels and is induced by LXR signaling in macrophages.
How is lysoplasmalogenase activity measured?
It can be measured using enzymatic assays that detect the release of fatty aldehydes or the formation of L-1-glycero-3-phosphocholine, often with fluorescent or radioactive substrates.
What diseases are associated with alkenylglycerophosphocholine hydrolase activity?
Dysregulation has been linked to cardiovascular disease, neurodegeneration, and infectious diseases.
What is the substrate of lysoplasmalogenase?
The substrate is 1-(1-alkenyl)-sn-glycero-3-phosphocholine, a lysoplasmalogen.
Where is alkenylglycerophosphocholine hydrolase located in the cell?
It is membrane-associated, particularly in microsomal fractions in mammalian tissues.
Can CRISPR be used to study lysoplasmalogenase?
Yes, CRISPR knockout, point mutation, knock-in, and overexpression models are powerful tools to dissect its function.
What is the difference between TMEM86A and TMEM86B?
Both are lysoplasmalogenases, but they may have distinct tissue distribution and regulation; TMEM86A is LXR-regulated.
Why is bacterial lysoplasmalogenase important?
It helps bacteria detoxify host lysolipids, contributing to pathogenesis, and is a potential antibiotic target.
Conclusion
Alkenylglycerophosphocholine hydrolase activity (GO:0047408) is a fundamental enzymatic function in plasmalogen catabolism, with critical roles in lipid signaling, membrane homeostasis, and disease. The identification of TMEM86A/B and bacterial YhhN proteins has advanced our understanding of this activity, but many questions remain about its regulation and therapeutic potential. Continued research using CRISPR models and lipidomics will further illuminate its pathophysiological significance.
References
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- 2. Kummer D et al.. 2025. Functional characterization of TMEM86A and TMEM86B mutants by a novel lysoplasmalogenase assay.. J Lipid Res 66(4):100766 PMID: 40024572
- 3. van Wouw SAE et al.. 2023. Sterol-regulated transmembrane protein TMEM86a couples LXR signaling to regulation of lysoplasmalogens in macrophages.. J Lipid Res 64(2):100325 PMID: 36592658
- 4. Jurkowitz MS et al.. 2015. The YhhN protein of Legionella pneumophila is a Lysoplasmalogenase.. Biochim Biophys Acta 1848(2):742-51 PMID: 25445671
- 5. Jurkowitz MS et al.. 2022. Mycobacterium tuberculosis encodes a YhhN family membrane protein with lysoplasmalogenase activity that protects against toxic host lysolipids.. J Biol Chem 298(5):101849 PMID: 35314194
- 6. Arthur G et al.. 1986. The catabolism of plasmenylcholine in the guinea pig heart.. Biochem J 236(2):475-80 PMID: 3753461
- 7. Jurkowitz-Alexander M et al.. 1989. Solubilization, purification and characterization of lysoplasmalogen alkenylhydrolase (lysoplasmalogenase) from rat liver microsomes.. Biochim Biophys Acta 1002(2):203-12 PMID: 2930768
- 8. Gunawan J et al.. 1985. Alkenylhydrolase: a microsomal enzyme activity in rat brain.. J Neurochem 44(2):370-5 PMID: 3917489
