GO:0008444 CDP-diacylglycerol-glycerol-3-phosphate 3-phosphatidyltransferase activity: Mechanism, Genes and Research Methods
Research-grade guide for scientists and biopharma professionals
Key Takeaways
• GO:0008444 describes the enzymatic activity that transfers a phosphatidyl group from CDP-diacylglycerol to sn-glycerol 3-phosphate, producing phosphatidylglycerophosphate (PGP) and CMP.
• This activity is catalyzed by PGP synthase (Pgs1 in yeast, PGS1 in humans) and is the committed step in the biosynthesis of phosphatidylglycerol and cardiolipin.
• Cardiolipin is essential for mitochondrial function and apoptosis, making this activity central to mitochondrial biology and cell death regulation.
• In yeast, PGS1 expression is regulated by phospholipid precursors inositol and choline, linking this activity to global lipid homeostasis.
• Altered cardiolipin metabolism has been implicated in Barth syndrome, cancer cachexia, and cardiac dysfunction, highlighting the biomedical importance of this enzymatic step.
• CRISPR-based knockout, point mutation, and overexpression models enable precise dissection of PGS1 function in health and disease.
Description
The enzyme activity defined by GO:0008444, CDP-diacylglycerol-glycerol-3-phosphate 3-phosphatidyltransferase activity, catalyzes the committed step in the biosynthesis of phosphatidylglycerol and cardiolipin. This activity transfers a phosphatidyl group from CDP-diacylglycerol to sn-glycerol 3-phosphate, yielding phosphatidylglycerophosphate (PGP) and CMP. The reaction is highly conserved from bacteria to humans and is essential for mitochondrial membrane integrity and function. Researchers study this activity to understand mitochondrial lipid biogenesis, apoptosis, and diseases linked to cardiolipin deficiency, such as Barth syndrome. In yeast, the enzyme is encoded by PGS1, and its expression is tightly regulated by phospholipid precursors, underscoring its role in lipid homeostasis. In mammals, PGS1 activity influences cardiolipin remodeling and has been implicated in cardiac pathophysiology and cancer cachexia. Given its central role in mitochondrial biology, GO:0008444 is a key target for genetic and biochemical investigations.
CDP-diacylglycerol-glycerol-3-phosphate 3-phosphatidyltransferase activity At A Glance
| GO ID | GO:0008444 |
|---|---|
| GO term | CDP-diacylglycerol-glycerol-3-phosphate 3-phosphatidyltransferase activity |
| Ontology | molecular_function |
| Synonym | Phosphatidylglycerophosphate synthase activity; PGP synthase activity; glycerol 3-phosphate phosphatidyltransferase activity |
| Major function | Catalyzes the committed step in phosphatidylglycerol and cardiolipin biosynthesis |
| Reaction | sn-glycerol 3-phosphate + CDP-diacylglycerol = 3-(3-sn-phosphatidyl)-sn-glycerol 1-phosphate + CMP + H+ |
| Cellular location | Mitochondrial inner membrane (in eukaryotes) |
| Representative genes | PGS1 (yeast), PGS1 (human), cls (bacteria) |
What Is GO:0008444?
GO:0008444 describes the catalytic activity of an enzyme that transfers a phosphatidyl group from CDP-diacylglycerol to sn-glycerol 3-phosphate, producing 3-(3-sn-phosphatidyl)-sn-glycerol 1-phosphate (phosphatidylglycerophosphate, PGP), CMP, and a proton. This activity is synonymous with phosphatidylglycerophosphate synthase (PGP synthase) and represents the first committed step in the synthesis of phosphatidylglycerol and cardiolipin.
Why Is CDP-diacylglycerol-glycerol-3-phosphate 3-phosphatidyltransferase activity Important in Cell Biology?
GO:0008444 is critical because it initiates the synthesis of cardiolipin, a phospholipid exclusively found in the mitochondrial inner membrane and essential for mitochondrial function, apoptosis, and energy metabolism. Dysregulation of this activity leads to cardiolipin abnormalities associated with Barth syndrome, heart failure, and cancer cachexia. Understanding this enzymatic step provides insights into mitochondrial biology and potential therapeutic targets.
• Committed step in cardiolipin biosynthesis, essential for mitochondrial structure and function.
• Regulated by phospholipid precursors inositol and choline in yeast, linking to lipid homeostasis.
• Implicated in Barth syndrome, a mitochondrial cardiolipin disorder.
• Altered in cancer cachexia and hepatic cardiolipin metabolism under TNFα regulation.
• Cardiac cardiolipin biosynthesis is stimulated by PPARα activation, relevant to heart disease.
• Target for antibacterial drug resistance studies, e.g., daptomycin resistance in Corynebacterium striatum.
• Conserved in photosynthetic organisms, where sulfoquinovosyldiacylglycerol synthesis under phosphate deficiency involves related pathways.
• Provides a model for studying enzyme regulation and membrane lipid biogenesis.
What Happens During CDP-diacylglycerol-glycerol-3-phosphate 3-phosphatidyltransferase activity?
Substrate Binding and Catalysis
In simple terms: The enzyme grabs two molecules and joins them together, releasing a small byproduct.
The enzyme binds CDP-diacylglycerol and sn-glycerol 3-phosphate, then catalyzes the transfer of the phosphatidyl group to the 3-hydroxyl of glycerol 3-phosphate, forming phosphatidylglycerophosphate (PGP) and releasing CMP and a proton. This reaction is the first committed step in phosphatidylglycerol and cardiolipin synthesis.
Role in Cardiolipin Biosynthesis Pathway
In simple terms: The product of this reaction is further modified to make cardiolipin, a key mitochondrial lipid.
PGP is dephosphorylated to phosphatidylglycerol, which is then converted to cardiolipin through the action of multiple enzymes. Cardiolipin is essential for mitochondrial membrane integrity and function, and its biosynthesis is tightly regulated.
Regulation by Phospholipid Precursors
In simple terms: The activity of this enzyme can be turned up or down by other lipids in the cell.
In Schizosaccharomyces pombe, expression of phosphatidylglycerolphosphate synthase is regulated by the phospholipid precursors inositol and choline, indicating feedback control of this activity. This ensures balanced lipid synthesis in response to cellular needs.
Tissue-Specific and Hormonal Regulation
In simple terms: In the heart, this enzyme can be stimulated by factors that increase fat burning.
Cardiac cardiolipin biosynthesis, which depends on this activity, is stimulated by PPARα activation, linking lipid metabolism to cardiac function. In liver, TNFα regulates cardiolipin metabolism, with implications for cancer cachexia.
Key Genes Involved in GO:0008444 CDP-diacylglycerol-glycerol-3-phosphate 3-phosphatidyltransferase activity
The following genes encode enzymes or regulators directly associated with CDP-diacylglycerol-glycerol-3-phosphate 3-phosphatidyltransferase activity and its downstream pathways.
| Gene | Major Role | Research Relevance |
|---|---|---|
| PGS1 (yeast) | Encodes phosphatidylglycerophosphate synthase | Model for regulation by inositol/choline |
| PGS1 (human) | Encodes phosphatidylglycerophosphate synthase | Cardiolipin biosynthesis, Barth syndrome |
| CLS1 (yeast) | Cardiolipin synthase | Downstream of PGP, cardiolipin synthesis |
| CRD1 (yeast) | Cardiolipin synthase | Cardiolipin remodeling |
| Taz1 (yeast) | Transacylase | Cardiolipin remodeling, Barth syndrome model |
| PPARα | Nuclear receptor | Stimulates cardiac cardiolipin biosynthesis |
| TNFα | Cytokine | Regulates hepatic cardiolipin metabolism |
| MprF (bacteria) | Aminoacyl phosphatidylglycerol synthase | Daptomycin resistance |
| Sqd1 (cyanobacteria) | Sulfoquinovosyldiacylglycerol synthase | Phosphate deficiency response |
| PGS1 (C. striatum) | PGP synthase | Daptomycin resistance |
| Gep4 (yeast) | PGP phosphatase | Downstream of PGP |
| Crd1 (C. elegans) | Cardiolipin synthase | Mitochondrial function |
| Acl1 (yeast) | Cardiolipin remodeling | Acyl chain remodeling |
| Plc1 (yeast) | Phospholipase C | Lipid signaling |
| Opi1 (yeast) | Transcriptional repressor | Regulates phospholipid genes |
| Ino2/Ino4 (yeast) | Transcription factors | Regulate PGS1 expression |
| Cds1 (yeast) | CDP-diacylglycerol synthase | Provides substrate for PGS1 |
How Is CDP-diacylglycerol-glycerol-3-phosphate 3-phosphatidyltransferase activity Regulated?
The activity of CDP-diacylglycerol-glycerol-3-phosphate 3-phosphatidyltransferase is regulated at multiple levels. In yeast, PGS1 expression is controlled by the phospholipid precursors inositol and choline through the Ino2/Ino4 regulatory circuit. In mammals, cardiac cardiolipin biosynthesis is stimulated by PPARα activation, linking this activity to fatty acid oxidation and energy metabolism. Additionally, TNFα regulates hepatic cardiolipin metabolism, suggesting cytokine-mediated control under inflammatory conditions. These regulatory mechanisms ensure that cardiolipin synthesis matches cellular demands for mitochondrial membrane biogenesis and function.
CDP-diacylglycerol-glycerol-3-phosphate 3-phosphatidyltransferase activity and Human Disease
| Gene | Disease / Biology | Potential Experimental Model |
|---|---|---|
| TAZ | Barth syndrome | Taz knockout or knock-in mouse models |
| PGS1 | Cardiolipin deficiency | PGS1 knockout cell lines |
| PPARα | Cardiac dysfunction | PPARα overexpression in cardiomyocytes |
| TNFα | Cancer cachexia | TNFα-treated hepatocytes |
| MprF | Daptomycin resistance | MprF mutant bacteria |
Barth Syndrome
Barth syndrome is an X-linked disorder caused by mutations in TAZ, leading to cardiolipin abnormalities. The activity of PGP synthase, upstream of cardiolipin synthesis, is critical for maintaining cardiolipin levels, and its dysfunction contributes to the mitochondrial defects observed in Barth syndrome.
Cancer Cachexia
In cancer cachexia, hepatic cardiolipin metabolism is altered by TNFα, affecting mitochondrial function. The regulation of PGP synthase activity and downstream cardiolipin synthesis may play a role in the metabolic disturbances associated with cachexia.
Cardiac Dysfunction
Cardiac cardiolipin biosynthesis is stimulated by PPARα activation, and perturbations in this pathway can lead to mitochondrial dysfunction and heart disease. The activity of PGP synthase is essential for maintaining cardiac mitochondrial function.
Antibiotic Resistance
In Corynebacterium striatum, high-level daptomycin resistance involves changes in phospholipid metabolism, including the activity of PGP synthase and related enzymes, highlighting the role of this activity in bacterial membrane adaptation.
From CDP-diacylglycerol-glycerol-3-phosphate 3-phosphatidyltransferase activity-Related Genes to Experimental Models
| Research Question | Suitable Model |
|---|---|
| What is the effect of PGS1 loss on mitochondrial function? | PGS1 knockout cell lines |
| How do point mutations in PGS1 affect enzymatic activity? | Point mutation knock-in cells |
| Does overexpression of PGS1 increase cardiolipin levels? | PGS1 overexpression cells |
| How is PGS1 regulated by inositol/choline? | Yeast PGS1 promoter-reporter strains |
| What is the role of PGS1 in daptomycin resistance? | Bacterial PGS1 mutants |
| Can PGS1 rescue cardiolipin deficiency in Barth syndrome models? | TAZ knockout cells with PGS1 overexpression |
How to Study the CDP-diacylglycerol-glycerol-3-phosphate 3-phosphatidyltransferase activity Process
| Method | What It Measures | Typical Application |
|---|---|---|
| Enzymatic assay | PGP synthase activity | Kinetic studies, inhibitor screening |
| Lipidomics | Phospholipid levels | Cardiolipin quantification |
| RNA-seq | Gene expression | Regulation by inositol/choline |
| Proteomics | Protein abundance | PPARα target validation |
| Seahorse | Mitochondrial respiration | Functional impact of PGS1 loss |
| Apoptosis assay | Cell death | Cardiolipin role in apoptosis |
| CRISPR screening | Gene essentiality | Identify synthetic lethal partners |
| Metabolic labeling | Lipid synthesis flux | Track cardiolipin biosynthesis |
Enzymatic Activity Assays
Direct measurement of PGP synthase activity using radiolabeled substrates or mass spectrometry to quantify product formation. This is the gold standard for assessing GO:0008444 activity.
Lipidomics
Mass spectrometry-based lipid profiling to quantify phosphatidylglycerol and cardiolipin levels, providing readouts of pathway flux downstream of PGP synthase.
Transcriptomics and Proteomics
RNA-seq and proteomics to assess expression of PGS1 and related genes under various conditions, such as inositol/choline regulation or PPARα activation.
Mitochondrial Functional Assays
Seahorse respirometry, membrane potential measurements, and apoptosis assays to link PGP synthase activity to mitochondrial function and cell death.
How CRISPR Can Be Used to Study GO:0008444 CDP-diacylglycerol-glycerol-3-phosphate 3-phosphatidyltransferase activity
Knockout
CRISPR knockout of PGS1 or related genes (e.g., TAZ) in cell lines or animal models to study loss-of-function phenotypes, such as cardiolipin depletion and mitochondrial dysfunction.
Point Mutation
Introduction of specific point mutations in PGS1 to dissect catalytic residues or regulatory phosphorylation sites, enabling structure-function studies.
Knock-in
Knock-in of tagged PGS1 (e.g., FLAG or GFP) to enable affinity purification, localization studies, and interactome analysis.
Overexpression
CRISPR activation (CRISPRa) or cDNA overexpression of PGS1 to increase enzymatic activity and cardiolipin levels, useful for rescue experiments and gain-of-function studies.
How EDITGENE Supports CDP-diacylglycerol-glycerol-3-phosphate 3-phosphatidyltransferase activity Research
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Contact EDITGENE today to design your custom CRISPR model for CDP-diacylglycerol-glycerol-3-phosphate 3-phosphatidyltransferase activity research.
Related Products
| Product name | Cat.No. | Species | Gene ID |
|---|
Frequently Asked Questions About CDP-diacylglycerol-glycerol-3-phosphate 3-phosphatidyltransferase activity
What is CDP-diacylglycerol-glycerol-3-phosphate 3-phosphatidyltransferase activity?
It is the enzymatic activity (GO:0008444) that catalyzes the transfer of a phosphatidyl group from CDP-diacylglycerol to sn-glycerol 3-phosphate, forming phosphatidylglycerophosphate and CMP, a key step in cardiolipin biosynthesis.
What genes are involved in CDP-diacylglycerol-glycerol-3-phosphate 3-phosphatidyltransferase activity?
The primary gene is PGS1, encoding phosphatidylglycerophosphate synthase, conserved from yeast to humans. Other related genes include CLS1, CRD1, and TAZ in yeast, and PPARα, TNFα in mammals.
What is the role of PGP synthase in cardiolipin synthesis?
PGP synthase catalyzes the first committed step in cardiolipin biosynthesis, producing phosphatidylglycerophosphate, which is subsequently converted to cardiolipin, essential for mitochondrial function.
How is PGP synthase activity regulated?
In yeast, it is regulated by inositol and choline via the Ino2/Ino4 pathway. In mammals, cardiac cardiolipin biosynthesis is stimulated by PPARα, and hepatic metabolism is regulated by TNFα.
What diseases are associated with PGP synthase dysfunction?
Barth syndrome, cancer cachexia, cardiac dysfunction, and antibiotic resistance in bacteria like Corynebacterium striatum.
How can CRISPR be used to study PGP synthase?
CRISPR knockout, point mutation, knock-in, and overexpression models allow precise manipulation of PGS1 and related genes to study their roles in mitochondrial function and disease.
What methods measure PGP synthase activity?
Enzymatic assays with radiolabeled substrates, lipidomics, and mass spectrometry are commonly used to measure PGP synthase activity and downstream lipid products.
Is PGP synthase conserved across species?
Yes, PGP synthase is highly conserved from bacteria to humans, with orthologs in yeast (PGS1), humans (PGS1), and bacteria (cls).
What is the connection between PGP synthase and apoptosis?
Cardiolipin, the product of the pathway initiated by PGP synthase, is involved in mitochondrial apoptosis, and its synthesis is critical for apoptotic signaling.
How does PPARα affect cardiolipin biosynthesis?
PPARα activation stimulates cardiac cardiolipin biosynthesis, including the activity of PGP synthase, linking lipid metabolism to cardiac function.
Conclusion
CDP-diacylglycerol-glycerol-3-phosphate 3-phosphatidyltransferase activity (GO:0008444) is a fundamental enzymatic step in the biosynthesis of cardiolipin, a mitochondrial phospholipid essential for energy metabolism and apoptosis. Its regulation by phospholipid precursors, PPARα, and TNFα underscores its integration into cellular lipid homeostasis and disease pathways. CRISPR-based models offer powerful tools to dissect the precise roles of PGS1 and related genes in health and disease, paving the way for therapeutic interventions.
References
- 1. McMillin JB et al.. 2002. Cardiolipin and apoptosis.. Biochim Biophys Acta 1585(2-3):97-107 PMID: 12531542
- 2. Minskoff SA et al.. 1997. Phosphatidylglycerophosphate synthase from yeast.. Biochim Biophys Acta 1348(1-2):187-91 PMID: 9370332
- 3. Jiang YJ et al.. 2004. Stimulation of cardiac cardiolipin biosynthesis by PPARalpha activation.. J Lipid Res 45(2):244-52 PMID: 14594999
- 4. Goldner NK et al.. 2018. Mechanism of High-Level Daptomycin Resistance in Corynebacterium striatum.. mSphere 3(4) PMID: 30089649
- 5. Endo K et al.. 2016. Sulfoquinovosyldiacylglycerol has an Essential Role in Thermosynechococcus elongatus BP-1 Under Phosphate-Deficient Conditions.. Plant Cell Physiol 57(12):2461-2471 PMID: 27615795
- 6. Karkhoff-Schweizer RR et al.. 1991. Phosphatidylglycerolphosphate synthase expression in Schizosaccharomyces pombe is regulated by the phospholipid precursors inositol and choline.. J Bacteriol 173(19):6132-8 PMID: 1655700
- 7. Li G et al.. 2007. New insights into the regulation of cardiolipin biosynthesis in yeast: implications for Barth syndrome.. Biochim Biophys Acta 1771(3):432-41 PMID: 16904369
- 8. Peyta L et al.. 2015. Regulation of hepatic cardiolipin metabolism by TNFα: Implication in cancer cachexia.. Biochim Biophys Acta 1851(11):1490-500 PMID: 26327596
