GO:0036148 phosphatidylglycerol acyl-chain remodeling: Mitochondrial Membrane Lipid Remodeling, Genes, Functions and Research Methods
Research-grade guide for scientists and biopharma professionals
Key Takeaways
• GO:0036148 phosphatidylglycerol acyl-chain remodeling is the biological process that alters the fatty acid composition of phosphatidylglycerol through sequential deacylation and re-acylation reactions.
• This process is mechanistically linked to cardiolipin remodeling because phosphatidylglycerol is a direct precursor of cardiolipin, and both lipids share acyl-chain remodeling enzymes.
• Tafazzin (TAZ) is the best-characterized transacylase in this pathway, and its dysfunction causes Barth syndrome, a rare X-linked disorder with cardiomyopathy and skeletal myopathy.
• Acyl chain composition determines mitochondrial inner membrane organization, respiratory chain supercomplex stability, and cellular energy metabolism.
• Yeast models, especially acb1 mutants, have revealed that acyl-CoA-binding proteins and phospholipid acyl chain pools regulate phosphatidylglycerol and cardiolipin remodeling.
• CRISPR knockout, point-mutation, and knock-in cell models enable causal testing of candidate remodeling genes in human cells.
Description
Phosphatidylglycerol acyl-chain remodeling (GO:0036148) is a biological process that modifies the fatty acid composition of phosphatidylglycerol, a negatively charged glycerophospholipid enriched in mitochondrial membranes. The process proceeds through sequential deacylation and re-acylation reactions, generating phosphatidylglycerol molecular species with different acyl chain lengths and degrees of unsaturation. This remodeling is essential because phosphatidylglycerol serves as the precursor for cardiolipin, a signature mitochondrial phospholipid that stabilizes respiratory chain complexes and maintains cristae architecture. Researchers study GO:0036148 to understand how mitochondrial membrane lipid composition is established and how its disruption contributes to inherited and acquired diseases. The enzymatic logic of phosphatidylglycerol acyl-chain remodeling overlaps with cardiolipin remodeling. Tafazzin, a phospholipid transacylase, transfers acyl chains between phospholipids and is required for normal cardiolipin and phosphatidylglycerol molecular species profiles. In Saccharomyces cerevisiae, loss of the acyl-CoA-binding protein Acb1p causes accumulation of cardiolipin molecular species with shorter acyl chains, demonstrating that acyl chain donor pools directly influence remodeling outcomes. These findings place phosphatidylglycerol acyl-chain remodeling within a broader mitochondrial lipid remodeling network that includes phosphatidylcholine and cardiolipin metabolism. Because phosphatidylglycerol and cardiolipin acyl chain composition affects membrane fluidity, protein-lipid interactions, and mitochondrial ultrastructure, defects in GO:0036148 are relevant to cardiomyopathy, mitochondrial myopathy, and metabolic disease. The availability of yeast genetics, mammalian cell models, and CRISPR-based editing now allows precise interrogation of the enzymes and acyl donors that execute this process.
phosphatidylglycerol acyl-chain remodeling At A Glance
| GO ID | GO:0036148 |
|---|---|
| GO term | phosphatidylglycerol acyl-chain remodeling |
| Ontology | biological_process |
| Synonym | phosphatidylglycerol acyl-chain remodelling |
| Major function | Remodeling phosphatidylglycerol acyl chains via deacylation and re-acylation to generate diverse phosphatidylglycerol molecular species |
| Substrate | Phosphatidylglycerol |
| Chemical reactions | Sequential deacylation and re-acylation |
| Related lipid | Cardiolipin, which derives from phosphatidylglycerol |
| Key enzyme class | Phospholipid transacylases and acyltransferases |
| Cellular context | Mitochondrial membranes |
| Representative gene | TAZ (tafazzin) |
What Is GO:0036148?
GO:0036148 phosphatidylglycerol acyl-chain remodeling is defined as the remodeling of phosphatidylglycerol acyl chains through sequential deacylation and re-acylation reactions, producing phosphatidylglycerol molecules that contain different types of fatty acid acyl chains. In other words, it is the post-synthetic editing of phosphatidylglycerol's fatty acid composition rather than its initial biosynthesis.
Why Is phosphatidylglycerol acyl-chain remodeling Important in Cell Biology?
Phosphatidylglycerol acyl-chain remodeling is important because it determines the molecular species of phosphatidylglycerol and its downstream product cardiolipin, which together regulate mitochondrial inner membrane organization, respiratory chain function, and cellular energy production. Perturbations in this process are linked to Barth syndrome, a disorder caused by TAZ mutations and characterized by cardiomyopathy, neutropenia, and skeletal myopathy. Understanding GO:0036148 therefore provides mechanistic insight into mitochondrial disease and identifies lipid remodeling enzymes as potential therapeutic targets.
• Controls the acyl chain composition of phosphatidylglycerol, a precursor of cardiolipin.
• Influences cardiolipin molecular species and mitochondrial inner membrane organization.
• TAZ/tafazzin dysfunction causes Barth syndrome, linking the process to cardiomyopathy.
• Acyl chain composition affects respiratory chain supercomplex stability and oxidative phosphorylation.
• Yeast acb1 mutants show that acyl-CoA pools regulate phosphatidylglycerol and cardiolipin remodeling.
• Phosphatidylcholine acyl chains can influence tafazzin-mediated cardiolipin remodeling in liposomes.
• Provides a model for studying lipid-protein interactions in mitochondrial membranes.
• Relevant to metabolic and mitochondrial diseases beyond Barth syndrome.
• Enables CRISPR-based causal testing of remodeling genes in human cell models.
• Supports development of lipid-targeted therapies for mitochondrial dysfunction.
What Happens During phosphatidylglycerol acyl-chain remodeling?
Deacylation of phosphatidylglycerol
In simple terms: First, fatty acids are removed from phosphatidylglycerol.
The remodeling process begins with deacylation, in which phospholipases remove acyl chains from phosphatidylglycerol, generating lysophosphatidylglycerol intermediates. This step creates acceptor sites for subsequent re-acylation and is a prerequisite for changing the acyl chain composition of the lipid. In yeast, loss of Acb1p alters acyl chain pools and leads to accumulation of cardiolipin species with shorter acyl chains, indicating that deacylation and acyl donor availability are tightly coupled.
Re-acylation with new acyl chains
In simple terms: Then, new fatty acids are attached to the lipid backbone.
Following deacylation, re-acylation reactions transfer acyl chains from donor phospholipids or acyl-CoA pools to lysophosphatidylglycerol, regenerating phosphatidylglycerol with a different fatty acid composition. Tafazzin catalyzes acyl chain transfer between phospholipids and is a key enzyme in this remodeling step. The acyl chain composition of donor lipids, such as phosphatidylcholine, can influence the efficiency and specificity of tafazzin-mediated remodeling in liposome systems.
Tafazzin and transacylation
In simple terms: Tafazzin is the enzyme that moves fatty acids between lipids.
Tafazzin (TAZ) is a mitochondrial transacylase that remodels cardiolipin and phosphatidylglycerol acyl chains by transferring acyl groups between phospholipid molecules. Studies using Saccharomyces cerevisiae Tafazzin have defined the mechanism by which it remodels the acyl chain composition of cardiolipin, a process mechanistically related to phosphatidylglycerol remodeling. In liposomes, the acyl chain composition of phosphatidylcholine modulates tafazzin-mediated cardiolipin remodeling, showing that membrane lipid environment affects enzyme activity.
Link to cardiolipin biosynthesis and remodeling
In simple terms: Phosphatidylglycerol remodeling feeds into cardiolipin production.
Phosphatidylglycerol is a direct precursor of cardiolipin, so its acyl chain composition influences the molecular species of newly synthesized cardiolipin. Cardiolipin remodeling enzymes, including tafazzin, further edit cardiolipin acyl chains, and defects in this network alter mitochondrial inner membrane organization and function. Yeast mutants lacking Acb1p accumulate cardiolipin with shorter acyl chains, providing genetic evidence that acyl chain remodeling of phosphatidylglycerol and cardiolipin are interconnected.
Membrane and protein interactions
In simple terms: The remodeled lipids affect how mitochondrial membranes work.
The acyl chain composition of phosphatidylglycerol and cardiolipin determines membrane fluidity, curvature, and the stability of respiratory chain supercomplexes. Cardiolipin concentration and acyl chain composition influence mitochondrial inner membrane molecular organization and function, which in turn affects oxidative phosphorylation. In mammalian cells, cardiolipin regulates mitochondrial ultrastructure and function, linking phosphatidylglycerol remodeling to organelle physiology.
Key Genes Involved in GO:0036148 phosphatidylglycerol acyl-chain remodeling
The following genes and proteins have been experimentally implicated in phosphatidylglycerol acyl-chain remodeling or in the closely related cardiolipin remodeling pathway that shares substrates and enzymes.
| Gene | Major Role | Research Relevance |
|---|---|---|
| TAZ | Mitochondrial transacylase that remodels cardiolipin and phosphatidylglycerol acyl chains | Mutations cause Barth syndrome; central to GO:0036148 research |
| ACB1 | Acyl-CoA-binding protein that maintains acyl-CoA pools for remodeling | Yeast acb1 mutants accumulate short-chain cardiolipin species |
| PGS1 | Phosphatidylglycerol phosphate synthase in phosphatidylglycerol biosynthesis | Provides substrate for remodeling |
| PTPMT1 | Phosphatidylglycerol phosphate phosphatase | Generates phosphatidylglycerol for remodeling |
| CLS1 | Cardiolipin synthase using phosphatidylglycerol as substrate | Links phosphatidylglycerol remodeling to cardiolipin |
| CRD1 | Cardiolipin synthase in yeast | Model enzyme for cardiolipin synthesis from phosphatidylglycerol |
| PLS1 | Phospholipase involved in phospholipid remodeling | Potential deacylation step in remodeling |
| LPL1 | Lysophospholipase | May contribute to deacylation of phosphatidylglycerol |
| GEP4 | Phosphatidylglycerol phosphate phosphatase in yeast | Supports phosphatidylglycerol pool for remodeling |
| TAM41 | Mitochondrial phosphatidylglycerol phosphate synthase | Contributes to phosphatidylglycerol biosynthesis |
| PLSCR3 | Phospholipid scramblase | Lipid trafficking relevant to remodeling |
| MIG1 | Transcription factor regulating lipid metabolism | Potential regulator of remodeling genes |
| OPA1 | Mitochondrial dynamin-like GTPase | Cristae organization linked to cardiolipin remodeling |
| DNM1L | Mitochondrial fission protein | Mitochondrial dynamics affected by lipid composition |
| VDAC1 | Mitochondrial outer membrane channel | Interacts with cardiolipin and affects membrane organization |
| ANT1 | Mitochondrial ADP/ATP carrier | Cardiolipin-dependent activity |
| COX4I1 | Cytochrome c oxidase subunit | Respiratory chain component sensitive to cardiolipin |
| ATP5F1A | ATP synthase subunit | Oxidative phosphorylation affected by lipid environment |
How Is phosphatidylglycerol acyl-chain remodeling Regulated?
Phosphatidylglycerol acyl-chain remodeling is regulated by the availability of acyl-CoA donors and the activity of transacylases such as tafazzin. In yeast, the acyl-CoA-binding protein Acb1p controls acyl chain pools and its loss alters cardiolipin molecular species, indicating that acyl donor supply is a regulatory node. The acyl chain composition of phosphatidylcholine also modulates tafazzin-mediated remodeling in liposomes, suggesting that membrane lipid environment regulates enzyme activity. Cardiolipin concentration and acyl chain composition further influence mitochondrial inner membrane organization, creating feedback between lipid composition and organelle function.
phosphatidylglycerol acyl-chain remodeling and Human Disease
| Gene | Disease / Biology | Potential Experimental Model |
|---|---|---|
| TAZ | Barth syndrome with cardiomyopathy and neutropenia | TAZ knockout or point-mutation iPSC-derived cardiomyocytes |
| ACB1 | Altered cardiolipin acyl chain composition in yeast | acb1 deletion yeast strains |
| PGS1 | Defective phosphatidylglycerol biosynthesis | PGS1 knockout cell lines |
| CLS1 | Impaired cardiolipin synthesis from phosphatidylglycerol | CLS1 mutant yeast or human cells |
| OPA1 | Mitochondrial cristae and membrane organization defects | OPA1 knockout cells with lipid profiling |
Barth syndrome and TAZ mutations
Barth syndrome is an X-linked disorder caused by mutations in TAZ, which encodes the transacylase tafazzin. Loss of tafazzin function impairs cardiolipin and phosphatidylglycerol remodeling, leading to cardiomyopathy, neutropenia, and skeletal myopathy. Studies of Barth syndrome connect cardiolipin abnormalities to cardiomyopathy and highlight the importance of acyl chain remodeling in mitochondrial disease.
Cardiolipin and plasmalogen interplay
In Barth syndrome, cardiolipin abnormalities interact with plasmalogen metabolism, suggesting that phosphatidylglycerol and cardiolipin remodeling defects have broader lipid metabolic consequences. This interplay may contribute to the clinical heterogeneity of the disorder and provides a rationale for studying lipid remodeling networks in patient cells.
Mitochondrial dysfunction and metabolic disease
Cardiolipin concentration and acyl chain composition affect mitochondrial inner membrane molecular organization and function, linking remodeling defects to oxidative phosphorylation dysfunction. In mammalian cells, cardiolipin regulates mitochondrial ultrastructure and function, so perturbations in phosphatidylglycerol remodeling may contribute to metabolic and neurodegenerative conditions.
From phosphatidylglycerol acyl-chain remodeling-Related Genes to Experimental Models
| Research Question | Suitable Model |
|---|---|
| Does loss of TAZ alter phosphatidylglycerol acyl chains? | TAZ knockout human cell line |
| Does a Barth syndrome point mutation impair transacylase activity? | TAZ point-mutation knock-in cells |
| Can wild-type TAZ rescue remodeling defects? | TAZ knock-in or overexpression |
| How do acyl-CoA pools regulate remodeling? | ACB1 knockout yeast |
| Does phosphatidylcholine acyl composition affect remodeling? | Liposome assays with recombinant tafazzin |
| How does cardiolipin composition affect mitochondrial function? | Cardiolipin profiling in mammalian cells |
How to Study the phosphatidylglycerol acyl-chain remodeling Process
| Method | What It Measures | Typical Application |
|---|---|---|
| Lipidomics (LC-MS) | Phosphatidylglycerol and cardiolipin molecular species | Detect acyl chain remodeling changes |
| Tafazzin activity assay | Transacylase activity in liposomes | Test enzyme function and substrate specificity |
| CRISPR knockout | Loss-of-function effects on lipid composition | Validate candidate remodeling genes |
| CRISPR point mutation | Effect of disease-associated variants | Model Barth syndrome mutations |
| Mitochondrial respiration assay | Oxidative phosphorylation capacity | Link lipid changes to function |
| Fluorescence imaging | Mitochondrial morphology and cristae | Assess ultrastructure changes |
| Western blot | Protein expression of TAZ and partners | Confirm knockout or overexpression |
| qPCR | mRNA levels of remodeling genes | Measure transcriptional regulation |
Lipidomics and mass spectrometry
Mass spectrometry-based lipidomics is used to quantify phosphatidylglycerol and cardiolipin molecular species and to detect changes in acyl chain length and saturation. Yeast acb1 mutants were characterized by accumulation of cardiolipin species with shorter acyl chains using lipid profiling.
Enzyme activity assays
Tafazzin transacylase activity can be measured using liposome-based assays that monitor acyl chain transfer between phospholipids. These assays have shown that phosphatidylcholine acyl chain composition influences tafazzin-mediated cardiolipin remodeling.
Mitochondrial functional assays
Mitochondrial inner membrane organization and respiratory chain function are assessed using biochemical and imaging approaches in cells with altered cardiolipin composition. Cardiolipin concentration and acyl chain composition affect mitochondrial ultrastructure and function in mammalian cells.
CRISPR-based genetic models
CRISPR knockout, point-mutation, and knock-in strategies are used to test causal roles of TAZ and other remodeling genes in human cells. These models allow precise dissection of how specific mutations affect phosphatidylglycerol and cardiolipin remodeling.
How CRISPR Can Be Used to Study GO:0036148 phosphatidylglycerol acyl-chain remodeling
Knockout
CRISPR knockout of TAZ or other remodeling genes in human cell lines eliminates protein function and allows lipidomic profiling of phosphatidylglycerol and cardiolipin species. Such models can reveal whether a gene is required for maintaining normal acyl chain composition.
Point Mutation
CRISPR point mutation introduces disease-associated variants, such as those found in Barth syndrome, to test their impact on transacylase activity and lipid remodeling. This approach distinguishes loss-of-function from hypomorphic alleles.
Knock-in
Knock-in of wild-type or tagged TAZ allows rescue experiments and enables tracking of the enzyme in mitochondrial membranes. Tagged knock-in models support localization and interaction studies.
Overexpression
Overexpression of TAZ or acyl-CoA-binding proteins can test whether increased enzyme levels enhance remodeling or correct lipid defects. Overexpression models are useful for biochemical purification and activity assays.
How EDITGENE Supports phosphatidylglycerol acyl-chain remodeling Research
Researchers studying phosphatidylglycerol acyl-chain remodeling-related genes often need to determine whether a candidate gene is causally involved in lipid remodeling, mitochondrial function, or disease phenotypes. EDITGENE provides CRISPR-based cell model services that enable precise genetic manipulation of TAZ, ACB1, PGS1, CLS1, and other remodeling genes in relevant cell types.
Contact EDITGENE today to design your custom CRISPR model for phosphatidylglycerol acyl-chain remodeling research.
Frequently Asked Questions About phosphatidylglycerol acyl-chain remodeling
What is phosphatidylglycerol acyl-chain remodeling?
It is the biological process GO:0036148 that remodels the acyl chains of phosphatidylglycerol through sequential deacylation and re-acylation reactions, generating phosphatidylglycerol with different fatty acid acyl chains.
What genes are involved in phosphatidylglycerol acyl-chain remodeling?
Key genes include TAZ, which encodes the transacylase tafazzin, and ACB1, which maintains acyl-CoA pools for remodeling.
What is the role of tafazzin in phosphatidylglycerol acyl-chain remodeling?
Tafazzin catalyzes acyl chain transfer between phospholipids and is required for normal cardiolipin and phosphatidylglycerol molecular species.
How is phosphatidylglycerol acyl-chain remodeling related to cardiolipin?
Phosphatidylglycerol is a direct precursor of cardiolipin, so its acyl chain composition influences cardiolipin molecular species and mitochondrial membrane function.
What diseases are associated with defects in phosphatidylglycerol acyl-chain remodeling?
Mutations in TAZ cause Barth syndrome, a disorder with cardiomyopathy, neutropenia, and skeletal myopathy.
Which model organisms are used to study phosphatidylglycerol acyl-chain remodeling?
Saccharomyces cerevisiae is widely used, and acb1 mutants show altered cardiolipin acyl chain composition.
How can CRISPR be used to study phosphatidylglycerol acyl-chain remodeling?
CRISPR knockout, point mutation, knock-in, and overexpression models allow causal testing of remodeling genes in human cells.
What methods measure phosphatidylglycerol acyl-chain remodeling?
Lipidomics by mass spectrometry, tafazzin activity assays, and mitochondrial functional assays are commonly used.
Why is acyl chain composition of phosphatidylglycerol important?
It affects mitochondrial inner membrane organization, respiratory chain supercomplex stability, and oxidative phosphorylation.
What is the GO ID for phosphatidylglycerol acyl-chain remodeling?
The GO ID is GO:0036148, a biological process term.
Conclusion
Phosphatidylglycerol acyl-chain remodeling (GO:0036148) is a mitochondrial lipid editing process that determines the fatty acid composition of phosphatidylglycerol and its downstream product cardiolipin. Its importance is underscored by Barth syndrome, where TAZ mutations impair remodeling and cause cardiomyopathy. Continued research using yeast genetics, lipidomics, and CRISPR cell models will clarify how acyl chain remodeling regulates mitochondrial function and disease.
References
- 1. Abe M et al.. 2016. Mechanism for Remodeling of the Acyl Chain Composition of Cardiolipin Catalyzed by Saccharomyces cerevisiae Tafazzin.. J Biol Chem 291(30):15491-502 PMID: 27268057
- 2. Abe M et al.. 2017. Role of Acyl Chain Composition of Phosphatidylcholine in Tafazzin-Mediated Remodeling of Cardiolipin in Liposomes.. Biochemistry 56(47):6268-6280 PMID: 29091407
- 3. Pennington ER et al.. 2019. The role of cardiolipin concentration and acyl chain composition on mitochondrial inner membrane molecular organization and function.. Biochim Biophys Acta Mol Cell Biol Lipids 1864(7):1039-1052 PMID: 30951877
- 4. Ikon N et al.. 2017. Barth Syndrome: Connecting Cardiolipin to Cardiomyopathy.. Lipids 52(2):99-108 PMID: 28070695
- 5. Bozelli JC Jr et al.. 2022. Interplay between cardiolipin and plasmalogens in Barth syndrome.. J Inherit Metab Dis 45(1):99-110 PMID: 34655242
- 6. Rijken PJ et al.. 2009. Cardiolipin molecular species with shorter acyl chains accumulate in Saccharomyces cerevisiae mutants lacking the acyl coenzyme A-binding protein Acb1p: new insights into acyl chain remodeling of cardiolipin.. J Biol Chem 284(40):27609-19 PMID: 19656950
- 7. Houtkooper RH et al.. 2008. Cardiolipin, the heart of mitochondrial metabolism.. Cell Mol Life Sci 65(16):2493-506 PMID: 18425414
- 8. Jiang Z et al.. 2022. Cardiolipin Regulates Mitochondrial Ultrastructure and Function in Mammalian Cells.. Genes (Basel) 13(10) PMID: 36292774
