GO:0016309 1-phosphatidylinositol-5-phosphate 4-kinase activity: Mechanism, Genes and Research Methods
Research-grade guide for scientists and biopharma professionals
Key Takeaways
• GO:0016309 describes the catalytic conversion of 1-phosphatidyl-1D-myo-inositol 5-phosphate (PI5P) to 1-phosphatidyl-1D-myo-inositol 4,5-bisphosphate (PIP2) using ATP.
• This activity is carried out by type II phosphatidylinositol 5-phosphate 4-kinases (PIP4K), also known as PIP5K type II, which are distinct from type I PIP5Ks.
• PIP4K enzymes regulate plasma-membrane PIP3 turnover and insulin signaling, linking lipid phosphorylation to metabolic control.
• PIP4Kγ accumulates at the spindle pole and prevents microtubule depolymerization, implicating this activity in mitosis.
• Small-molecule chemical probes for PIP4Kγ have been developed, enabling selective interrogation of this lipid kinase in cells.
• Dysregulation of PIP4K has been associated with cancer, metabolic disorders, and host-pathogen interactions [2, 5].
Description
Phosphoinositides are minor membrane phospholipids that act as signaling molecules and membrane identity determinants. The enzyme activity defined by GO:0016309, 1-phosphatidylinositol-5-phosphate 4-kinase activity, catalyzes the phosphorylation of phosphatidylinositol 5-phosphate (PI5P) at the D-4 position to generate phosphatidylinositol 4,5-bisphosphate (PIP2). This reaction is distinct from the canonical PI4P 5-kinase route and represents a major pathway for PIP2 synthesis in specific cellular contexts. The enzymes responsible, the type II phosphatidylinositol 5-phosphate 4-kinases (PIP4K), are evolutionarily conserved and have been implicated in diverse processes including insulin signaling, membrane trafficking, and mitosis [1, 2]. Understanding this activity is therefore critical for researchers studying phosphoinositide signaling, metabolic disease, and cancer.
1-phosphatidylinositol-5-phosphate 4-kinase activity At A Glance
| GO ID | GO:0016309 |
|---|---|
| GO term | 1-phosphatidylinositol-5-phosphate 4-kinase activity |
| Ontology | molecular_function |
| Synonym | PIP4K, type II PIP kinase activity, 1-phosphatidylinositol-5-phosphate kinase |
| Major function | Phosphorylates PI5P to PIP2, regulating phosphoinositide signaling |
| Reaction | 1-phosphatidyl-1D-myo-inositol 5-phosphate + ATP = 1-phosphatidyl-1D-myo-inositol 4,5-bisphosphate + ADP + H+ |
| Substrates | Phosphatidylinositol 5-phosphate (PI5P), ATP |
| Products | Phosphatidylinositol 4,5-bisphosphate (PIP2), ADP, H+ |
| Cellular location | Cytosol, plasma membrane, spindle pole (for PIP4Kγ) |
What Is GO:0016309?
According to the Gene Ontology, GO:0016309 is defined as the catalysis of the reaction: a 1-phosphatidyl-1D-myo-inositol 5-phosphate + ATP = a 1-phosphatidyl-1D-myo-inositol 4,5-bisphosphate + ADP + H+. In simpler terms, it is the enzyme activity that adds a phosphate group to the 4-position of the inositol ring of phosphatidylinositol 5-phosphate, using ATP as the phosphate donor. This reaction produces phosphatidylinositol 4,5-bisphosphate, a key signaling lipid. The activity is synonymous with 1-phosphatidylinositol-5-phosphate kinase, ATP:1-phosphatidyl-1D-myo-inositol-5-phosphate 4-phosphotransferase, PIP4K, and type II PIP kinase.
Why Is 1-phosphatidylinositol-5-phosphate 4-kinase activity Important in Cell Biology?
GO:0016309 is important because it defines an alternative route for the synthesis of PIP2, a lipid second messenger that controls ion channels, cytoskeletal dynamics, and vesicle trafficking. Unlike the classical PI4P 5-kinase pathway, the PIP4K-mediated reaction uses PI5P as a substrate, and its products and intermediates have distinct signaling roles. PIP4K enzymes regulate plasma-membrane PIP3 turnover and insulin signaling, directly linking this activity to metabolic homeostasis. Furthermore, PIP4Kγ localizes to the mitotic spindle and prevents microtubule depolymerization, suggesting a role in cell division. Chemical probes targeting PIP4Kγ have been developed, highlighting the therapeutic potential of modulating this activity.
• Provides an alternative pathway for PIP2 synthesis, influencing membrane identity and signaling.
• Regulates PIP3 turnover at the plasma membrane, affecting insulin sensitivity and glucose uptake.
• Controls microtubule stability at the spindle pole during mitosis.
• Is implicated in cancer cell proliferation and survival through phosphoinositide signaling.
• Plays a role in host-pathogen interactions, as PIP4K homologs are found in parasites.
• Can be targeted by small-molecule chemical probes, enabling pharmacological dissection.
• Contributes to membrane remodeling processes in apicomplexan parasites.
• May influence immune signaling pathways through phosphoinositide-dependent effectors.
Molecular Mechanism of 1-phosphatidylinositol-5-phosphate 4-kinase activity
Substrate recognition and binding
In simple terms: The enzyme grabs its lipid substrate and ATP.
PIP4K enzymes specifically recognize phosphatidylinositol 5-phosphate (PI5P) as a substrate, distinguishing it from other phosphoinositides. The enzyme binds PI5P in the membrane and positions the inositol ring for phosphorylation at the D-4 position. ATP binds in a separate pocket, and the reaction proceeds via a phosphotransfer mechanism. Biochemical analysis of mammalian PIP4K enzymes has confirmed their substrate specificity and catalytic parameters.
Catalytic phosphorylation
In simple terms: A phosphate from ATP is attached to the lipid.
The catalytic domain of PIP4K transfers the gamma-phosphate of ATP to the 4-hydroxyl group of the inositol ring of PI5P, producing phosphatidylinositol 4,5-bisphosphate (PIP2) and ADP. This reaction is magnesium-dependent, as Mg2+ coordinates the ATP phosphate groups. The activity is conserved from mammals to parasites, with a unique phosphatidylinositol 4-phosphate 5-kinase in Plasmodium falciparum activated by ADP-ribosylation factor.
Product release and membrane association
In simple terms: The new lipid stays in the membrane and the enzyme lets go.
After catalysis, PIP2 remains in the membrane, where it can interact with effector proteins. PIP4K enzymes themselves are recruited to specific membrane compartments. For example, PIP4Kγ accumulates at the spindle pole during mitosis, indicating that product release and enzyme localization are spatially regulated. In mammalian cells, PIP4K regulates plasma-membrane PIP3 turnover, suggesting that the product PIP2 is rapidly metabolized or interconverted.
Regulation by upstream signals
In simple terms: Other signals tell the enzyme when to work.
PIP4K activity is regulated by upstream signaling pathways. In insulin signaling, PIP4K modulates PIP3 levels, affecting downstream Akt activation. Small-molecule chemical probes have been identified that selectively inhibit PIP4Kγ, demonstrating that its activity can be pharmacologically controlled. Additionally, ARMH3-mediated recruitment of PI4KB directs Golgi-to-endosome trafficking and activation of STING, highlighting crosstalk between phosphoinositide kinases.
Key Genes Involved in GO:0016309 1-phosphatidylinositol-5-phosphate 4-kinase activity
The following genes encode enzymes or related proteins that carry out or regulate 1-phosphatidylinositol-5-phosphate 4-kinase activity.
| Gene | Major Role | Research Relevance |
|---|---|---|
| PIP4K2A | Catalyzes PI5P to PIP2 conversion | Insulin signaling, cancer metabolism |
| PIP4K2B | Catalyzes PI5P to PIP2 conversion | Metabolic regulation, PIP3 turnover |
| PIP4K2C | Catalyzes PI5P to PIP2 conversion; spindle pole localization | Mitosis, microtubule stability |
| PIP5K1A | Type I PIP kinase, produces PIP2 from PI4P | Distinct from PIP4K, but related activity |
| PIP5K1B | Type I PIP kinase | Phosphoinositide signaling |
| PIP5K1C | Type I PIP kinase | Focal adhesion, endocytosis |
| PI4KB | Phosphatidylinositol 4-kinase beta | Golgi-to-endosome trafficking, STING activation |
| ARF1 | ADP-ribosylation factor, activates PIP kinases | Parasite PIP kinase activation |
| ARF6 | ADP-ribosylation factor, regulates PIP4K | Membrane trafficking |
| APOL1 | Apolipoprotein L, membrane remodeling | Host-pathogen interactions |
| HO-1 | Heme oxygenase 1, ferroptosis regulator | Liver injury, heat stroke |
| STING | Antiviral effector, activated by phosphoinositides | Innate immunity |
| PIP4K2A (paralog) | PIP4K alpha isoform | Chemical probe development |
| PIP4K2B (paralog) | PIP4K beta isoform | Insulin signaling |
| PIP4K2C (paralog) | PIP4K gamma isoform | Spindle pole, mitosis |
| PI5P4Kγ | PIP4K gamma, chemical probe target | Drug discovery |
| PI4P5K | Phosphatidylinositol 4-phosphate 5-kinase | Parasite enzyme |
| PIP5K | Phosphatidylinositol 4-phosphate 5-kinase | General phosphoinositide synthesis |
How Is 1-phosphatidylinositol-5-phosphate 4-kinase activity Regulated?
The activity of 1-phosphatidylinositol-5-phosphate 4-kinase is regulated at multiple levels. PIP4K enzymes are activated by ADP-ribosylation factors (ARFs) in parasites, as shown for a unique phosphatidylinositol 4-phosphate 5-kinase in Plasmodium falciparum. In mammalian cells, PIP4K regulates plasma-membrane PIP3 turnover and insulin signaling, implying that its activity is modulated by insulin and growth factor receptors. PIP4Kγ localization to the spindle pole is cell-cycle dependent, suggesting regulation during mitosis. Additionally, small-molecule chemical probes can inhibit PIP4Kγ, providing a tool to study its regulation.
1-phosphatidylinositol-5-phosphate 4-kinase activity and Human Disease
| Gene | Disease / Biology | Potential Experimental Model |
|---|---|---|
| PIP4K2A | Cancer, insulin resistance | Knockout cell lines, xenograft models |
| PIP4K2B | Metabolic syndrome | Point-mutation knock-in mice |
| PIP4K2C | Mitotic defects, cancer | Tagged knock-in for spindle localization |
| PI4KB | Immune disorders, STING-related | Overexpression in HEK293T cells |
| APOL1 | Kidney disease, infection | Knockout podocytes |
Cancer and metabolic disorders
PIP4K enzymes, which carry out GO:0016309, are implicated in cancer and metabolic diseases. PIP4K regulates plasma-membrane PIP3 turnover and insulin signaling, and its dysregulation can lead to altered glucose uptake and cell proliferation. Chemical probes targeting PIP4Kγ have been developed, offering potential for therapeutic intervention in cancers dependent on phosphoinositide signaling.
Infectious diseases
Phosphoinositide kinases are essential for the life cycle of intracellular parasites. A unique phosphatidylinositol 4-phosphate 5-kinase in Plasmodium falciparum is activated by ADP-ribosylation factor, highlighting a potential target for antimalarial drugs. Apolipoprotein-L functions in membrane remodeling, which may intersect with phosphoinositide metabolism during infection.
Inflammatory and immune signaling
Phosphoinositides generated by PIP4K activity can influence immune signaling. ARMH3-mediated recruitment of PI4KB directs Golgi-to-endosome trafficking and activation of the antiviral effector STING, demonstrating a link between phosphoinositide kinases and innate immunity. Additionally, heme oxygenase 1-mediated ferroptosis in Kupffer cells initiates liver injury during heat stroke, a process that may involve lipid signaling.
From 1-phosphatidylinositol-5-phosphate 4-kinase activity-Related Genes to Experimental Models
| Research Question | Suitable Model |
|---|---|
| Does PIP4K2A loss affect PIP2 levels? | Knockout cell lines (e.g., HeLa, HEK293T) |
| How does a specific point mutation in PIP4K2B alter insulin signaling? | Point-mutation knock-in via CRISPR |
| Where does PIP4K2C localize during mitosis? | Tagged knock-in (e.g., GFP) in HeLa cells |
| Can PIP4Kγ overexpression drive transformation? | Overexpression stable cell lines |
| What genes are synthetic lethal with PIP4K2A deletion? | CRISPR library screening |
| How does PIP4K2B phosphorylation change upon insulin stimulation? | Phosphoproteomics of knock-in cells |
How to Study the 1-phosphatidylinositol-5-phosphate 4-kinase activity Process
| Method | What It Measures | Typical Application |
|---|---|---|
| In vitro kinase assay | Enzymatic conversion of PI5P to PIP2 | Validate PIP4K activity and inhibitor efficacy |
| Lipidomics (LC-MS) | Phosphoinositide abundance | Quantify PIP2/PIP3 changes in knockout cells |
| Live-cell imaging | Subcellular localization of PIP4K | Study spindle pole accumulation |
| CRISPR knockout screening | Gene essentiality and synthetic lethality | Identify pathways interacting with PIP4K |
| Chemical probe profiling | Selective inhibition of PIP4Kγ | Pharmacological dissection of PIP4Kγ function |
| Phosphoproteomics | Changes in phosphorylation signaling | Assess insulin signaling upon PIP4K modulation |
| Parasite kinase assays | Activity of Plasmodium PIP5K | Antimalarial drug discovery |
| Membrane remodeling assays | APOL1-mediated lipid dynamics | Host-pathogen interaction studies |
Biochemical kinase assays
The catalytic activity of PIP4K can be measured using in vitro kinase assays with purified enzyme, PI5P substrate, and radiolabeled ATP. These assays quantify the conversion of PI5P to PIP2 and are essential for validating enzyme specificity and kinetics.
Lipidomics and mass spectrometry
Mass spectrometry-based lipidomics allows quantification of phosphoinositide species in cells. By comparing wild-type and PIP4K knockout cells, researchers can determine how loss of GO:0016309 activity affects PIP2 and PIP3 levels.
Live-cell imaging
Fluorescently tagged PIP4K isoforms and phosphoinositide biosensors can be used to visualize enzyme localization and lipid dynamics in real time. For example, PIP4Kγ accumulates at the spindle pole during mitosis, which can be observed with GFP-tagged knock-in cells.
CRISPR screening
Genome-wide CRISPR knockout screens can identify genes that are synthetic lethal with PIP4K loss or that modulate PIP4K-dependent signaling. Such screens have been used to uncover vulnerabilities in cancer cells lacking PIP4K.
How CRISPR Can Be Used to Study GO:0016309 1-phosphatidylinositol-5-phosphate 4-kinase activity
Knockout
CRISPR knockout of PIP4K genes (e.g., PIP4K2A, PIP4K2B, PIP4K2C) eliminates GO:0016309 activity, allowing researchers to study its role in PIP2 synthesis, insulin signaling, and mitosis. Knockout cell lines can be used for lipidomics and phenotypic assays.
Point Mutation
Point mutations in the catalytic domain of PIP4K can abolish kinase activity while preserving protein structure. CRISPR-mediated point mutation knock-in is useful for dissecting the specific contribution of the enzymatic activity versus scaffolding functions.
Knock-in
Tagged knock-in of PIP4K isoforms (e.g., GFP or HA) enables visualization and immunoprecipitation of endogenous proteins. This approach has revealed that PIP4Kγ localizes to the spindle pole during mitosis.
Overexpression
Overexpression of wild-type or mutant PIP4K in cell lines can amplify the activity of GO:0016309, leading to elevated PIP2 levels. This is useful for studying downstream effects on signaling pathways such as Akt activation and PIP3 turnover.
How EDITGENE Supports 1-phosphatidylinositol-5-phosphate 4-kinase activity Research
Researchers studying 1-phosphatidylinositol-5-phosphate 4-kinase activity-related genes often need to determine whether a candidate gene is causally involved in phosphoinositide signaling, metabolic regulation, or cell division. EDITGENE provides a comprehensive suite of CRISPR-based services to generate precisely engineered cell models, enabling rigorous functional validation of GO:0016309 and its associated genes.
Contact EDITGENE today to design your custom CRISPR model for 1-phosphatidylinositol-5-phosphate 4-kinase activity research.
Frequently Asked Questions About 1-phosphatidylinositol-5-phosphate 4-kinase activity
What is 1-phosphatidylinositol-5-phosphate 4-kinase activity?
It is the enzyme activity defined by GO:0016309 that converts phosphatidylinositol 5-phosphate to phosphatidylinositol 4,5-bisphosphate using ATP.
What genes are involved in 1-phosphatidylinositol-5-phosphate 4-kinase activity?
The main genes are PIP4K2A, PIP4K2B, and PIP4K2C, which encode the alpha, beta, and gamma isoforms of type II PIP kinases [1, 2].
How is 1-phosphatidylinositol-5-phosphate 4-kinase activity regulated?
It is regulated by ADP-ribosylation factors, insulin signaling, and cell cycle-dependent localization, as shown for PIP4Kγ at the spindle pole [1, 8].
What diseases are associated with PIP4K enzymes?
PIP4K enzymes are linked to cancer, insulin resistance, and infectious diseases such as malaria [2, 8].
What is the difference between PIP4K and PIP5K?
PIP4K (type II) phosphorylates PI5P at the D-4 position, while PIP5K (type I) phosphorylates PI4P at the D-5 position; both produce PIP2 but use different substrates.
Can PIP4K activity be inhibited by small molecules?
Yes, chemical probes have been developed that selectively inhibit PIP4Kγ, enabling pharmacological studies.
Where is PIP4Kγ localized during mitosis?
PIP4Kγ accumulates at the spindle pole and prevents microtubule depolymerization.
How does PIP4K affect insulin signaling?
PIP4K regulates plasma-membrane PIP3 turnover, thereby modulating insulin sensitivity and downstream Akt signaling.
What model systems are used to study PIP4K?
Common models include CRISPR knockout cell lines, tagged knock-in cells for imaging, and in vitro kinase assays [1, 2, 4].
Is there a chemical probe for PIP4Kγ?
Yes, a selective chemical probe for PIP4Kγ has been identified and characterized.
Conclusion
GO:0016309, 1-phosphatidylinositol-5-phosphate 4-kinase activity, represents a critical enzymatic step in phosphoinositide signaling, generating PIP2 from PI5P. Its roles in insulin signaling, mitosis, and disease make it a compelling target for basic and translational research. With the availability of CRISPR models, chemical probes, and advanced lipidomics, researchers are well-equipped to dissect the functions of PIP4K enzymes. EDITGENE provides the tools and expertise to accelerate these discoveries.
References
- 1. Lin TC et al.. 2019. Phosphatidylinositol-5-phosphate 4-kinase gamma accumulates at the spindle pole and prevents microtubule depolymerization.. Cell Div 14:9 PMID: 31452676
- 2. Sharma S et al.. 2019. Phosphatidylinositol 5 Phosphate 4-Kinase Regulates Plasma-Membrane PIP(3) Turnover and Insulin Signaling.. Cell Rep 27(7):1979-1990.e7 PMID: 31091438
- 3. Li R et al.. 2024. Heme oxygenase 1-mediated ferroptosis in Kupffer cells initiates liver injury during heat stroke.. Acta Pharm Sin B 14(9):3983-4000 PMID: 39309491
- 4. Mathre S et al.. 2019. Functional analysis of the biochemical activity of mammalian phosphatidylinositol 5 phosphate 4-kinase enzymes.. Biosci Rep 39(2) PMID: 30718367
- 5. Pays E. 2024. Apolipoprotein-L Functions in Membrane Remodeling.. Cells 13(24) PMID: 39768205
- 6. Fang R et al.. 2023. ARMH3-mediated recruitment of PI4KB directs Golgi-to-endosome trafficking and activation of the antiviral effector STING.. Immunity 56(3):500-515.e6 PMID: 36921576
- 7. Drewry DH et al.. 2023. Identification of a chemical probe for lipid kinase phosphatidylinositol-5-phosphate 4-kinase gamma (PI5P4Kγ).. Curr Res Chem Biol 3 PMID: 41937984
- 8. Leber W et al.. 2009. A unique phosphatidylinositol 4-phosphate 5-kinase is activated by ADP-ribosylation factor in Plasmodium falciparum.. Int J Parasitol 39(6):645-53 PMID: 19171150
