GO:0047394 glycerophosphoinositol inositolphosphodiesterase activity: Mechanism, Genes and Research Methods
Research-grade guide for scientists and biopharma professionals
Key Takeaways
• GO:0047394 describes the molecular function of glycerophosphoinositol inositolphosphodiesterase, which hydrolyzes glycerophosphoinositol (GroPIns) to myo-inositol 1-phosphate and glycerol.
• This activity is part of the glycerophosphodiesterase (GDE) family, enzymes that cleave the glycerophosphate bond in glycerophosphoinositol and related metabolites.
• GroPIns, the substrate of this enzyme, is a natural phosphoinositide derivative with anti-inflammatory and anti-thrombotic properties in mammalian cells.
• Dysregulation of glycerophosphoinositol metabolism has been linked to cancer cell transformation and altered lipid signaling.
• In yeast, glycerophosphoinositol serves as an alternative phosphate source, and its transport and utilization are tightly regulated.
• Research on GO:0047394 benefits from CRISPR-based knockout, knock-in, and overexpression models to dissect gene function and substrate specificity.
Description
Glycerophosphoinositol inositolphosphodiesterase activity (GO:0047394) is a molecular function that catalyzes the hydrolysis of glycerophosphoinositol (GroPIns) into myo-inositol 1-phosphate and glycerol. This enzymatic step is critical for the turnover of glycerophosphoinositol, a water-soluble phosphoinositide derivative that accumulates in cells under various physiological and pathological conditions. The reaction is mediated by members of the glycerophosphodiesterase (GDE) family, which are conserved from yeast to humans and play roles in lipid signaling, membrane remodeling, and phosphate homeostasis. Understanding this activity is important because GroPIns and its metabolites influence inflammatory responses, thrombotic processes, and cancer cell behavior. Moreover, the enzyme's ability to liberate inositol phosphate makes it a key player in inositol lipid metabolism, which is central to cell signaling and membrane trafficking. Researchers studying GO:0047394 are often interested in identifying the specific GDE enzymes responsible for this activity, characterizing their substrate specificity, and exploring their potential as therapeutic targets. The availability of CRISPR-based tools now allows precise genetic manipulation of these enzymes to test their roles in health and disease.
glycerophosphoinositol inositolphosphodiesterase activity At A Glance
| GO ID | GO:0047394 |
|---|---|
| GO term | glycerophosphoinositol inositolphosphodiesterase activity |
| Ontology | molecular_function |
| Synonym | 1,2-cyclic-inositol-phosphate phosphodiesterase activity; 1-D-myo-inositol-1,2-cyclic-phosphate 2-inositolphosphohydrolase activity; 1-(sn-glycero-3-phospho)-1D-myo-inositol inositolphosphohydrolase activity; D-inositol 1,2-cyclic phosphate 2-phosphohydrolase activity; D-myo-inositol 1,2-cyclic phosphate 2-phosphohydrolase activity; D-myo-inositol 1:2-cyclic phosphate 2-phosphohydrolase activity; inositol-1,2-cyclic-phosphate 2-inositolphosphohydrolase activity |
| Major function | Hydrolysis of glycerophosphoinositol to myo-inositol 1-phosphate and glycerol |
| Substrate | 1-(sn-glycero-3-phospho)-1D-myoinositol (glycerophosphoinositol) |
| Products | 1D-myo-inositol 1-phosphate and glycerol |
| Reaction type | Phosphodiesterase cleavage (hydrolytic) |
| Cofactors | None known; water is a reactant |
| Enzyme family | Glycerophosphodiesterase (GDE) family |
What Is GO:0047394?
GO:0047394, glycerophosphoinositol inositolphosphodiesterase activity, is defined as the catalysis of the reaction: H2O + 1-(sn-glycero-3-phospho)-1D-myoinositol = 1D-myo-inositol 1-phosphate + glycerol. In simpler terms, this enzyme activity removes the inositol phosphate headgroup from glycerophosphoinositol, releasing glycerol and inositol 1-phosphate. This reaction is a phosphodiesterase cleavage that breaks the bond between the glycerol backbone and the inositol ring, specifically at the phosphodiester linkage. The activity is also known by synonyms such as 1,2-cyclic-inositol-phosphate phosphodiesterase activity and D-myo-inositol 1,2-cyclic phosphate 2-phosphohydrolase activity, reflecting its ability to hydrolyze cyclic inositol phosphates as well.
Why Is glycerophosphoinositol inositolphosphodiesterase activity Important in Cell Biology?
Glycerophosphoinositol inositolphosphodiesterase activity is important because it controls the cellular levels of glycerophosphoinositol, a bioactive lipid that modulates inflammatory and thrombotic responses. By hydrolyzing GroPIns, this enzyme generates myo-inositol 1-phosphate, a precursor for inositol lipid synthesis and a signaling molecule in its own right. Dysregulation of this activity can lead to altered phosphoinositide metabolism, which is a hallmark of cancer and other diseases. In yeast, the ability to utilize glycerophosphoinositol as a phosphate source depends on this activity, linking it to nutrient sensing and stress responses. Thus, understanding GO:0047394 provides insights into fundamental lipid metabolic pathways and potential therapeutic targets.
• Regulates levels of glycerophosphoinositol, an anti-inflammatory and anti-thrombotic lipid mediator.
• Contributes to inositol phosphate production, impacting cell signaling and membrane trafficking.
• Linked to cancer cell transformation through altered phospholipase A2 activity and GroPIns production.
• Plays a role in phosphate homeostasis in yeast by allowing GroPIns utilization as a phosphate source.
• Potential target for anti-inflammatory and anti-thrombotic therapies.
• Involved in lipidomic changes observed in substance use disorder and neurodegenerative contexts.
• Enables metabolic flexibility by recycling inositol from glycerophosphoinositol.
• Provides a model to study phosphodiesterase mechanism and substrate specificity.
• Relevant to extracellular vesicle lipid composition and intercellular signaling.
• Can be studied using CRISPR knockout to assess loss-of-function phenotypes.
What Happens During glycerophosphoinositol inositolphosphodiesterase activity?
Substrate recognition and binding
In simple terms: The enzyme grabs glycerophosphoinositol and positions it for cleavage.
The enzyme binds its substrate, glycerophosphoinositol (GroPIns), through a conserved active site that recognizes the glycerophosphate moiety and the inositol ring. This binding is specific, as the enzyme distinguishes GroPIns from other phospholipids. The active site likely contains a binuclear metal center or key catalytic residues that stabilize the substrate and water molecule for hydrolysis.
Catalytic hydrolysis
In simple terms: Water attacks the bond between glycerol and inositol phosphate, breaking it apart.
The catalytic mechanism involves a water molecule that attacks the phosphodiester bond, leading to the release of myo-inositol 1-phosphate and glycerol. This hydrolysis is a phosphodiesterase reaction, and the enzyme may also act on cyclic inositol phosphates, as indicated by its synonyms. The reaction is metal-independent in some GDE family members, but specific cofactor requirements may vary.
Product release and recycling
In simple terms: The products are released and can be used in other metabolic pathways.
After cleavage, myo-inositol 1-phosphate and glycerol are released. Myo-inositol 1-phosphate can be dephosphorylated to free inositol, which is reused for phosphatidylinositol synthesis, or it can enter signaling pathways. Glycerol can be utilized in glycolysis or other metabolic routes. In yeast, GroPIns can serve as a phosphate source, and its hydrolysis is essential for phosphate acquisition.
Regulation of enzyme activity
In simple terms: The enzyme's activity can be turned up or down by cellular signals.
The activity of glycerophosphoinositol inositolphosphodiesterase is likely regulated at the transcriptional and post-translational levels, although specific mechanisms are not fully defined. In mammalian cells, GroPIns levels are influenced by phospholipase A2 activity, which produces GroPIns from phosphatidylinositol. Thus, the enzyme's substrate availability is linked to phospholipase A2 signaling. Additionally, the enzyme may be regulated by cellular phosphate status in yeast.
Key Genes Involved in GO:0047394 glycerophosphoinositol inositolphosphodiesterase activity
The following genes encode enzymes with glycerophosphoinositol inositolphosphodiesterase activity or are closely related to its function, based on published literature.
| Gene | Major Role | Research Relevance |
|---|---|---|
| GDE1 | Glycerophosphodiesterase that hydrolyzes glycerophosphoinositol | Implicated in lipid signaling and cancer |
| GDE2 | Glycerophosphodiesterase with specificity for glycerophosphoinositol | Role in neuronal differentiation and cancer |
| GDE3 | Glycerophosphodiesterase involved in GroPIns metabolism | Linked to cell migration and invasion |
| GDE4 | Glycerophosphodiesterase with lysophospholipase activity | Potential role in inflammation |
| GDE5 | Glycerophosphodiesterase that may act on GroPIns | Associated with muscle development |
| GDE6 | Glycerophosphodiesterase family member | Less characterized, potential role in lipid metabolism |
| GDE7 | Glycerophosphodiesterase with GroPIns hydrolase activity | Involved in cancer cell proliferation |
| GDPD1 | Glycerophosphodiester phosphodiesterase domain containing 1 | May hydrolyze GroPIns; linked to metabolic disorders |
| GDPD2 | Glycerophosphodiester phosphodiesterase domain containing 2 | Potential role in bone development |
| GDPD3 | Glycerophosphodiester phosphodiesterase domain containing 3 | Involved in lipid metabolism |
| GDPD4 | Glycerophosphodiester phosphodiesterase domain containing 4 | Testis-specific expression; function unclear |
| GDPD5 | Glycerophosphodiester phosphodiesterase domain containing 5 | Regulates GroPIns levels in cancer |
| PLA2G4A | Phospholipase A2 that produces GroPIns from phosphatidylinositol | Upregulated in k-ras transformed cells |
| GIT1 | G protein-coupled receptor kinase interacting protein | May interact with GDEs in signaling |
| PITPNA | Phosphatidylinositol transfer protein alpha | Supplies substrate for GroPIns production |
| PIP5K1A | Phosphatidylinositol-4-phosphate 5-kinase | Involved in phosphoinositide synthesis |
| INPP5A | Inositol polyphosphate-5-phosphatase | Regulates inositol phosphate levels |
How Is glycerophosphoinositol inositolphosphodiesterase activity Regulated?
The activity of glycerophosphoinositol inositolphosphodiesterase is regulated by substrate availability, which depends on phospholipase A2-mediated production of GroPIns from phosphatidylinositol. In yeast, the transport and utilization of glycerophosphoinositol as a phosphate source are controlled by multiple factors, including phosphate sensing pathways. In mammalian cells, inflammatory stimuli such as lipopolysaccharide can modulate GroPIns levels and its downstream effects. However, direct post-translational regulation of the enzyme itself remains to be fully elucidated.
glycerophosphoinositol inositolphosphodiesterase activity and Human Disease
| Gene | Disease / Biology | Potential Experimental Model |
|---|---|---|
| GDE1 | Cancer, inflammation | Knockout in cancer cell lines |
| PLA2G4A | k-ras transformed thyroid cells | Overexpression in thyroid cells |
| GDE5 | Muscle development | Knockout in myoblasts |
| GDPD5 | Cancer cell proliferation | Knockdown in cancer cells |
| GDE2 | Neuronal differentiation | Knockout in neuronal stem cells |
Cancer and cell transformation
Transformation by the k-ras oncogene correlates with increased phospholipase A2 activity, glycerophosphoinositol production, and phosphoinositide synthesis in thyroid cells. This suggests that glycerophosphoinositol inositolphosphodiesterase activity, by controlling GroPIns levels, may influence cancer cell signaling and proliferation. Direct LC-MS/MS analysis of extra- and intracellular GroPIns in model cancer cell lines has been developed to study this pathway.
Inflammation and thrombosis
The natural phosphoinositide derivative glycerophosphoinositol inhibits lipopolysaccharide-induced inflammatory and thrombotic responses. This implies that enzymes hydrolyzing GroPIns, such as glycerophosphoinositol inositolphosphodiesterase, could modulate inflammation by reducing GroPIns levels. Targeting this activity might therefore have therapeutic potential in inflammatory diseases.
Neurodegeneration and substance use disorder
Lipidomic and proteomic insights from extracellular vesicles in the postmortem dorsolateral prefrontal cortex reveal substance use disorder-induced brain changes, including alterations in glycerophosphoinositol metabolism. This links glycerophosphoinositol inositolphosphodiesterase activity to neuropsychiatric conditions and highlights its potential role in brain lipid homeostasis.
From glycerophosphoinositol inositolphosphodiesterase activity-Related Genes to Experimental Models
| Research Question | Suitable Model |
|---|---|
| Does loss of GDE1 affect GroPIns levels? | CRISPR knockout in HEK293 cells |
| Does a point mutation in the catalytic site abolish activity? | CRISPR point mutation knock-in |
| Can tagged GDE1 be used for localization studies? | Knock-in of GFP tag |
| Does overexpression of GDE1 reduce inflammation? | Overexpression in macrophages |
| Which GDE family members hydrolyze GroPIns? | CRISPR library screening |
| Does GDE5 regulate muscle differentiation? | Knockout in C2C12 cells |
How to Study the glycerophosphoinositol inositolphosphodiesterase activity Process
| Method | What It Measures | Typical Application |
|---|---|---|
| LC-MS/MS | Glycerophosphoinositol levels | Quantify substrate in cells |
| CRISPR knockout | Loss-of-function phenotype | Identify gene function |
| Enzymatic assay | Hydrolysis rate | Measure specific activity |
| RNA-seq | Transcriptional changes | Identify pathways affected |
| Proteomics | Protein expression changes | Discover interacting proteins |
| Lipidomics | Lipid profile changes | Assess global lipid metabolism |
| Immunofluorescence | Subcellular localization | Determine organelle targeting |
| Co-immunoprecipitation | Protein-protein interactions | Identify binding partners |
LC-MS/MS for GroPIns quantification
Direct LC-MS/MS analysis of extra- and intracellular glycerophosphoinositol in model cancer cell lines allows precise measurement of substrate and product levels, enabling assessment of enzyme activity in cells.
CRISPR knockout and phenotypic analysis
CRISPR knockout of candidate GDE genes followed by lipidomic and proteomic profiling can reveal the specific contribution of each enzyme to GroPIns metabolism and downstream phenotypes.
Enzymatic activity assays
In vitro assays using recombinant enzymes and radiolabeled or fluorescent substrates can directly measure glycerophosphoinositol inositolphosphodiesterase activity and determine kinetic parameters.
Transcriptomics and proteomics
RNA-seq and proteomics can identify changes in gene expression and protein levels upon modulation of glycerophosphoinositol inositolphosphodiesterase activity, revealing regulatory networks.
How CRISPR Can Be Used to Study GO:0047394 glycerophosphoinositol inositolphosphodiesterase activity
Knockout
CRISPR knockout of genes encoding glycerophosphoinositol inositolphosphodiesterase activity, such as GDE1 or GDE5, can abolish enzyme function and reveal its role in GroPIns metabolism, inflammation, and cancer. Knockout cell lines are valuable for lipidomic and phenotypic studies.
Point Mutation
Introducing point mutations in the catalytic residues of GDE enzymes via CRISPR can help identify essential amino acids for hydrolysis and distinguish between enzyme isoforms with different substrate specificities.
Knock-in
Knock-in of epitope tags (e.g., GFP, FLAG) into endogenous GDE loci allows visualization and purification of the enzyme for interaction and localization studies without overexpression artifacts.
Overexpression
CRISPR-mediated overexpression of GDE enzymes can be used to study gain-of-function effects on GroPIns levels, inflammatory signaling, and cell proliferation.
How EDITGENE Supports glycerophosphoinositol inositolphosphodiesterase activity Research
Researchers studying glycerophosphoinositol inositolphosphodiesterase activity-related genes often need to determine whether a candidate gene is causally involved in GroPIns metabolism, inflammation, or cancer. EDITGENE provides a comprehensive suite of CRISPR services to enable such investigations, from knockout to knock-in and library screening.
Contact EDITGENE today to design your custom CRISPR model for glycerophosphoinositol inositolphosphodiesterase activity research.
Frequently Asked Questions About glycerophosphoinositol inositolphosphodiesterase activity
What is glycerophosphoinositol inositolphosphodiesterase activity?
It is a molecular function (GO:0047394) that catalyzes the hydrolysis of glycerophosphoinositol to myo-inositol 1-phosphate and glycerol.
What genes are involved in glycerophosphoinositol inositolphosphodiesterase activity?
Genes in the glycerophosphodiesterase family, such as GDE1, GDE2, GDE3, GDE5, and GDPD5, encode enzymes with this activity.
What is the substrate of glycerophosphoinositol inositolphosphodiesterase?
The substrate is glycerophosphoinositol (GroPIns), also known as 1-(sn-glycero-3-phospho)-1D-myoinositol.
What diseases are associated with glycerophosphoinositol inositolphosphodiesterase activity?
It has been linked to cancer, inflammation, thrombosis, and substance use disorder through alterations in GroPIns metabolism.
How is glycerophosphoinositol inositolphosphodiesterase activity regulated?
It is regulated by substrate availability via phospholipase A2 and by phosphate status in yeast, but direct post-translational regulation is not fully understood.
What methods are used to study glycerophosphoinositol inositolphosphodiesterase activity?
LC-MS/MS, enzymatic assays, CRISPR knockout, RNA-seq, and proteomics are commonly used.
What is the role of glycerophosphoinositol in inflammation?
Glycerophosphoinositol inhibits lipopolysaccharide-induced inflammatory and thrombotic responses, so its hydrolysis may modulate inflammation.
Can CRISPR be used to study glycerophosphoinositol inositolphosphodiesterase activity?
Yes, CRISPR knockout, knock-in, and overexpression models are powerful tools to dissect gene function and substrate specificity.
What is the reaction catalyzed by GO:0047394?
H2O + 1-(sn-glycero-3-phospho)-1D-myoinositol = 1D-myo-inositol 1-phosphate + glycerol.
Which cell lines are used to study glycerophosphoinositol metabolism?
Model cancer cell lines such as HeLa and MCF-7 are used for LC-MS/MS analysis of GroPIns.
Conclusion
Glycerophosphoinositol inositolphosphodiesterase activity (GO:0047394) is a key enzymatic function in glycerophosphoinositol metabolism, with implications for inflammation, thrombosis, cancer, and neurodegeneration. Understanding its regulation and substrate specificity can reveal new therapeutic targets. EDITGENE's CRISPR services provide the tools needed to dissect this pathway and accelerate discovery.
References
- 3. Vessichelli M et al.. 2017. The natural phosphoinositide derivative glycerophosphoinositol inhibits the lipopolysaccharide-induced inflammatory and thrombotic responses.. J Biol Chem 292(31):12828-12841 PMID: 28600357
- 4. Valitutti S et al.. 1991. Transformation by the k-ras oncogene correlates with increases in phospholipase A2 activity, glycerophosphoinositol production and phosphoinositide synthesis in thyroid cells.. Cell Signal 3(4):321-32 PMID: 1657098
- 5. Okeoma CM et al.. 2025. Lipidomic and proteomic insights from extracellular vesicles in the postmortem dorsolateral prefrontal cortex reveal substance use disorder-induced brain changes.. Transl Psychiatry 15(1):284 PMID: 40817260
- 6. Campos AM et al.. 2021. Direct LC-MS/MS Analysis of Extra- and Intracellular Glycerophosphoinositol in Model Cancer Cell Lines.. Front Immunol 12:646681 PMID: 33737939
- 7. Corda D et al.. 2014. The emerging physiological roles of the glycerophosphodiesterase family.. FEBS J 281(4):998-1016 PMID: 24373430
- 8. Almaguer C et al.. 2004. Glycerophosphoinositol, a novel phosphate source whose transport is regulated by multiple factors in Saccharomyces cerevisiae.. J Biol Chem 279(30):31937-42 PMID: 15145930
