GO:0004697 diacylglycerol-dependent serine/threonine kinase activity: Mechanism, Genes and Research Methods
Research-grade guide for scientists and biopharma professionals
Key Takeaways
• GO:0004697 describes the molecular function of protein kinases that require diacylglycerol (DAG) as a cofactor to phosphorylate serine or threonine residues on target proteins.
• This activity is primarily carried out by classical (cPKC) and novel (nPKC) protein kinase C isoforms, which are recruited to membranes by DAG and phosphatidylserine.
• DAG-dependent kinases regulate diverse cellular processes including proliferation, differentiation, apoptosis, and neuronal branching.
• Dysregulation of PKC signaling is implicated in cancer, neurodegenerative disorders such as spinocerebellar ataxia type 14, and metabolic diseases.
• Studying this activity requires tools such as kinase assays, phospho-specific antibodies, and CRISPR-based genetic models to dissect isoform-specific functions.
• EDITGENE provides CRISPR knockout, point mutation, knock-in, overexpression, and library screening services to accelerate research on DAG-dependent kinases.
Description
Diacylglycerol-dependent serine/threonine kinase activity (GO:0004697) is a molecular function defined as the catalysis of protein phosphorylation using ATP, with diacylglycerol (DAG) as an essential cofactor. This activity is characteristic of the protein kinase C (PKC) family, which includes classical isoforms (PKCα, PKCβ, PKCγ) and novel isoforms (PKCδ, PKCε, PKCη, PKCθ) that are activated by DAG and phosphatidylserine. The discovery of PKC and its regulation by DAG and phorbol esters marked a paradigm shift in understanding signal transduction. Researchers study this activity to uncover mechanisms of cell signaling, proliferation, and disease, as its dysregulation contributes to cancer, neurodegeneration, and immune disorders. The ability to precisely edit genes encoding these kinases using CRISPR technologies enables functional dissection of their roles in health and disease.
diacylglycerol-dependent serine/threonine kinase activity At A Glance
| GO ID | GO:0004697 |
|---|---|
| GO term | diacylglycerol-dependent serine/threonine kinase activity |
| Ontology | molecular_function |
| Synonym | PKC activity, cPKC, nPKC, diacylglycerol-activated phospholipid-dependent protein kinase C activity |
| Major function | Phosphorylation of serine/threonine residues on target proteins in a DAG-dependent manner |
| Cofactors | Diacylglycerol (DAG), phosphatidylserine, calcium (for classical PKCs) |
| Representative enzymes | PKCα, PKCβ, PKCγ, PKCδ, PKCε, PKCη, PKCθ |
| Pathway context | G protein-coupled receptor and receptor tyrosine kinase signaling |
What Is GO:0004697?
GO:0004697 describes the catalytic activity of enzymes that transfer a phosphate group from ATP to a serine or threonine residue on a protein substrate, a reaction that strictly requires diacylglycerol (DAG) as a cofactor. This activity is synonymous with DAG-activated protein kinase C (PKC) isoforms, including classical and novel PKCs, which are recruited to membranes upon DAG generation.
Why Is diacylglycerol-dependent serine/threonine kinase activity Important in Cell Biology?
DAG-dependent serine/threonine kinase activity is central to signal transduction pathways that control cell growth, differentiation, and survival. Its dysregulation is linked to numerous pathologies, including cancer, where PKC isoforms can act as oncogenes or tumor suppressors, and neurodegenerative diseases such as spinocerebellar ataxia type 14, where mutations in PKCγ lead to sex-specific disruptions in signaling. Understanding this activity at the molecular level is essential for developing targeted therapies and for interpreting how cells respond to external stimuli.
• Regulates cell proliferation and differentiation through phosphorylation of downstream targets.
• Mediates immune cell activation, including B-cell antigen receptor signaling.
• Controls neuronal axon branching and guidance.
• Involved in negative regulation of MAP kinase pathways via G protein-coupled receptors.
• Implicated in steroidogenesis in adrenal glomerulosa cells.
• Modulates gene expression, such as GLAST regulation by phorbol esters.
• Dysregulated in cancers, making PKC isoforms potential drug targets.
• Linked to neurodegenerative disorders like spinocerebellar ataxia type 14.
• Plays a role in metabolic signaling and insulin sensitivity.
• Serves as a model for studying lipid second messenger signaling.
Molecular Mechanism of diacylglycerol-dependent serine/threonine kinase activity
Activation by Diacylglycerol and Phosphatidylserine
In simple terms: DAG and phosphatidylserine act like a key and a lock to turn on the kinase.
Classical and novel PKC isoforms are recruited to the plasma membrane by diacylglycerol (DAG) and phosphatidylserine, which induce conformational changes that release autoinhibition and allow catalytic activation. Classical PKCs also require calcium for full activation, whereas novel PKCs are calcium-independent.
Substrate Recognition and Phosphorylation
In simple terms: Once active, the kinase adds a phosphate tag to specific proteins.
Activated PKCs phosphorylate serine or threonine residues on substrate proteins, often within basic consensus sequences. This phosphorylation alters substrate activity, localization, or interactions, thereby propagating signals. For example, PKCδ phosphorylates ARD1, affecting its function.
Cofactor Requirements and Regulation
In simple terms: The kinase needs specific lipids and sometimes calcium to work.
DAG is essential for activity, but phosphatidylserine and, for classical isoforms, calcium are also required. The activity is further regulated by phosphorylation of the kinase itself, by interacting proteins, and by second messengers such as calcium and phorbol esters.
Downstream Signaling and Cellular Outcomes
In simple terms: The kinase sets off a chain reaction that changes cell behavior.
DAG-dependent kinases regulate MAP kinase pathways, gene expression, and cytoskeletal dynamics. For instance, they can negatively regulate MAP kinase via G protein-coupled receptors and control axon branching in C. elegans. These outcomes depend on cell type and context.
Key Genes Involved in GO:0004697 diacylglycerol-dependent serine/threonine kinase activity
The following genes encode proteins with diacylglycerol-dependent serine/threonine kinase activity or are key regulators/substrates in this pathway.
| Gene | Major Role | Research Relevance |
|---|---|---|
| PRKCA | Classical PKC isoform; phosphorylates diverse substrates | Implicated in cancer, cardiac disease, and neuronal signaling |
| PRKCB | Classical PKC isoform; involved in B-cell signaling | Target for autoimmune and lymphoma research |
| PRKCG | Classical PKC isoform; highly expressed in brain | Mutations cause spinocerebellar ataxia type 14 |
| PRKCD | Novel PKC isoform; regulates apoptosis and proliferation | Phosphorylates ARD1; linked to cancer and immune disorders |
| PRKCE | Novel PKC isoform; involved in pain and addiction | Studied in nociception and cardiac protection |
| PRKCH | Novel PKC isoform; regulates T-cell activation | Associated with autoimmune diseases |
| PRKCQ | Novel PKC isoform; critical for T-cell function | Target for immunosuppressive drugs |
| DGK | Diacylglycerol kinase; terminates DAG signaling | Regulates PKC activity by degrading DAG |
| PLCB | Phospholipase C beta; produces DAG | Upstream activator of PKC via GPCR signaling |
| PLCG | Phospholipase C gamma; produces DAG | Links receptor tyrosine kinases to PKC |
| RACK1 | Scaffold protein for PKC | Modulates PKC substrate specificity and localization |
| ARD1 | Substrate of PKCδ | Phosphorylation affects its function in cells |
| UNC-6 | Netrin homolog; regulates axon branching | Its C domain silences DAG-dependent kinase in C. elegans |
| GLAST | Glutamate transporter; regulated by phorbol esters | Expression controlled by PKC activation |
| MAPK | Downstream target of PKC signaling | Negatively regulated by DAG-dependent mechanisms |
| STK24 | Serine/threonine kinase; synonym for PKCε | Studied in cell polarity and migration |
| Pkc1p | Yeast PKC homolog | Model for PKC signaling in cell wall integrity |
How Is diacylglycerol-dependent serine/threonine kinase activity Regulated?
The activity of diacylglycerol-dependent serine/threonine kinases is tightly regulated by the balance of DAG production and degradation. Phospholipase C enzymes generate DAG from phosphatidylinositol bisphosphate, while diacylglycerol kinases convert DAG to phosphatidic acid, thereby terminating PKC signaling. Additionally, PKC isoforms are regulated by phosphorylation at specific sites, by interaction with scaffold proteins like RACK1, and by calcium and phosphatidylserine. Negative regulation by G protein-coupled receptors has been observed for MAP kinase pathways.
diacylglycerol-dependent serine/threonine kinase activity and Human Disease
| Gene | Disease / Biology | Potential Experimental Model |
|---|---|---|
| PRKCG | Spinocerebellar ataxia type 14 | Knock-in mouse with SCA14 mutation |
| PRKCD | Cancer, immune dysregulation | Knockout cell lines and xenografts |
| PRKCB | B-cell lymphoma, autoimmunity | B-cell-specific knockout mice |
| PRKCQ | T-cell-mediated autoimmune diseases | T-cell-specific knockout mice |
| DGK | Metabolic disorders, cancer | Overexpression and knockout models |
Cancer
Altered PKC signaling is frequently observed in cancer. PKC isoforms can promote tumor growth, invasion, and survival, and some are considered oncogenes. For example, PKCδ interacts with and phosphorylates ARD1, which may contribute to tumorigenesis. Targeting DAG-dependent kinases is an active area of anticancer drug development.
Neurodegeneration
Mutations in PRKCG, encoding PKCγ, cause spinocerebellar ataxia type 14 (SCA14). A mouse model of SCA14 revealed sex-specific disruptions in PKCγ signaling, highlighting the importance of this kinase in cerebellar function. Additionally, DAG-dependent kinases regulate axon branching, and their dysregulation may contribute to neurodevelopmental disorders.
Immune Disorders
PKC isoforms, particularly PKCβ and PKCθ, are critical for B-cell and T-cell activation. PKCnu (PKCη) is regulated by the B-cell antigen receptor, and its dysfunction can lead to immunodeficiency or autoimmunity. Modulating DAG-dependent kinase activity is a strategy for immunosuppression.
From diacylglycerol-dependent serine/threonine kinase activity-Related Genes to Experimental Models
| Research Question | Suitable Model |
|---|---|
| Does loss of PKCα affect cell proliferation? | CRISPR knockout of PRKCA in cancer cell lines |
| How does a point mutation in PRKCG alter kinase activity? | CRISPR point mutation knock-in in neurons |
| What is the effect of PKCδ overexpression on apoptosis? | CRISPR-mediated overexpression in cell lines |
| Which substrates are phosphorylated by PKCε? | Knock-in of tagged PKCε followed by proteomics |
| Can a DAG analog rescue signaling in PKC knockout cells? | Pharmacological rescue in knockout models |
| What is the role of PKCθ in T-cell activation? | Conditional knockout in primary T cells |
How to Study the diacylglycerol-dependent serine/threonine kinase activity Process
| Method | What It Measures | Typical Application |
|---|---|---|
| In vitro kinase assay | Phosphorylation activity | Enzyme kinetics and inhibitor testing |
| Phosphoproteomics | Global phosphorylation changes | Substrate identification |
| Western blot with phospho-antibodies | Specific phosphorylation events | Validation of kinase activation |
| Live-cell imaging | Kinase translocation and DAG dynamics | Real-time signaling studies |
| CRISPR knockout screen | Gene essentiality and pathway interactions | Discovery of regulators |
| RNA-seq | Transcriptional changes | Downstream gene expression analysis |
| Proximity ligation assay | Protein-protein interactions | Detection of kinase-substrate complexes |
| Flow cytometry | Cell phenotype and phospho-protein levels | Immune cell signaling analysis |
Kinase Activity Assays
In vitro kinase assays using recombinant PKC isoforms and peptide substrates measure the transfer of radioactive or fluorescent phosphate from ATP to substrate in the presence of DAG and phosphatidylserine. These assays are used to determine specific activity and to screen inhibitors.
Phosphoproteomics
Mass spectrometry-based phosphoproteomics identifies substrates and phosphorylation sites regulated by DAG-dependent kinases. For example, PKCδ phosphorylation of ARD1 was discovered using such approaches. This method provides a global view of signaling networks.
Live-Cell Imaging
Fluorescently tagged PKC isoforms and DAG biosensors allow real-time visualization of kinase translocation and activation in living cells. This technique has been used to study PKC dynamics in response to receptor activation.
CRISPR Screens
Genome-wide CRISPR knockout screens can identify genes that modulate DAG-dependent kinase activity or sensitivity to inhibitors. Such screens are powerful for discovering synthetic lethal interactions and resistance mechanisms.
How CRISPR Can Be Used to Study GO:0004697 diacylglycerol-dependent serine/threonine kinase activity
Knockout
CRISPR knockout of genes encoding DAG-dependent kinases (e.g., PRKCA, PRKCD) creates cell models to study loss-of-function phenotypes, such as altered proliferation, apoptosis, or differentiation. These models are essential for validating drug targets and understanding isoform-specific roles.
Point Mutation
Introducing disease-associated point mutations (e.g., in PRKCG for SCA14) using CRISPR allows researchers to study how specific amino acid changes affect kinase activity, substrate specificity, and cellular signaling. Such models mimic human mutations and can reveal sex-specific effects.
Knock-in
Knock-in of tagged versions of PKC isoforms (e.g., GFP or HA tags) enables visualization, immunoprecipitation, and proteomic analysis of the kinase in its native context. This approach helps identify interacting partners and substrates.
Overexpression
CRISPR-mediated overexpression of wild-type or mutant PKC isoforms can be achieved by inserting a strong promoter or using inducible systems. Overexpression models are useful for studying gain-of-function effects and for screening inhibitors.
How EDITGENE Supports diacylglycerol-dependent serine/threonine kinase activity Research
Researchers studying diacylglycerol-dependent serine/threonine kinase activity-related genes often need to determine whether a candidate gene is causally involved in a specific signaling pathway or disease. EDITGENE provides a comprehensive suite of CRISPR-based services to generate precisely engineered cell models, enabling functional validation and mechanistic studies.
Contact EDITGENE today to design your custom CRISPR model for diacylglycerol-dependent serine/threonine kinase activity research.
Related Products
| Product name | Cat.No. | Species | Gene ID | |
|---|---|---|---|---|
| PRKCA Knockout HEK293 Cell Line | EDJ-KQ116 | Human | 5578 | Details Get a Quote |
| PRKCB Knockout HEK293 Cell Line | EDJ-KQ584 | Human | 5579 | Details Get a Quote |
| PRKCQ Knockout HEK293 Cell Line | EDJ-KQ585 | Human | 5588 | Details Get a Quote |
| PRKCG Knockout HEK293 Cell Line | EDJ-KQ739 | Human | 5582 | Details Get a Quote |
| PKN1 Knockout HEK293 Cell Line | EDJ-KQ847 | Human | 5585 | Details Get a Quote |
| PKN2 Knockout HEK293 Cell Line | EDJ-KQ848 | Human | 5586 | Details Get a Quote |
| PKN3 Knockout HEK293 Cell Line | EDJ-KQ850 | Human | 29941 | Details Get a Quote |
| PRKD1 Knockout HEK293 Cell Line | EDJ-KQ1311 | Human | 5587 | Details Get a Quote |
| PRKD3 Knockout HEK293 Cell Line | EDJ-KQ1312 | Human | 23683 | Details Get a Quote |
| PRKD2 Knockout HEK293 Cell Line | EDJ-KQ1313 | Human | 25865 | Details Get a Quote |
| PRKCZ Knockout HEK293 Cell Line | EDJ-KQ1346 | Human | 5590 | Details Get a Quote |
| PRKCI Knockout HEK293 Cell Line | EDJ-KQ1347 | Human | 5584 | Details Get a Quote |
| PRKCE Knockout HEK293 Cell Line | EDJ-KQ1429 | Human | 5581 | Details Get a Quote |
| DGKQ Knockout HEK293 Cell Line | EDJ-KQ1698 | Human | 1609 | Details Get a Quote |
| PRKCD Knockout HEK293 Cell Line | EDJ-KQ2534 | Human | 5580 | Details Get a Quote |
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Frequently Asked Questions About diacylglycerol-dependent serine/threonine kinase activity
What is diacylglycerol-dependent serine/threonine kinase activity?
It is a molecular function (GO:0004697) where an enzyme phosphorylates serine or threonine residues on proteins using ATP, and requires diacylglycerol as a cofactor.
What genes are involved in diacylglycerol-dependent serine/threonine kinase activity?
Genes include PRKCA, PRKCB, PRKCG, PRKCD, PRKCE, PRKCH, PRKCQ, which encode protein kinase C isoforms, as well as upstream regulators like PLCB and DGK.
Which diseases are associated with DAG-dependent kinases?
They are implicated in cancers, neurodegenerative disorders like spinocerebellar ataxia type 14, and immune disorders.
How is diacylglycerol-dependent kinase activity regulated?
It is regulated by DAG production via phospholipase C, degradation by diacylglycerol kinases, phosphorylation of the kinase itself, and interaction with scaffold proteins.
What are the synonyms for GO:0004697?
Synonyms include PKC activity, cPKC, nPKC, diacylglycerol-activated phospholipid-dependent protein kinase C activity, and protein kinase Cepsilon activity.
What is the role of PKC in cancer?
PKC isoforms can promote tumor growth and survival; for example, PKCδ phosphorylates ARD1, which may contribute to tumorigenesis.
How can I study DAG-dependent kinase activity in the lab?
Common methods include in vitro kinase assays, phosphoproteomics, live-cell imaging, and CRISPR screens.
What is spinocerebellar ataxia type 14?
It is a neurodegenerative disorder caused by mutations in PRKCG, leading to sex-specific disruptions in PKCγ signaling.
Can CRISPR be used to model DAG-dependent kinase mutations?
Yes, CRISPR knockout, point mutation knock-in, and overexpression models are widely used to study these kinases.
What services does EDITGENE offer for studying DAG-dependent kinases?
EDITGENE provides CRISPR knockout, point mutation, knock-in, overexpression, library screening, and bioinformatics services tailored to your research needs.
Conclusion
Diacylglycerol-dependent serine/threonine kinase activity (GO:0004697) is a fundamental molecular function mediated by protein kinase C isoforms, with critical roles in cell signaling, proliferation, and disease. Understanding its regulation and downstream effects requires precise genetic tools. EDITGENE's CRISPR services empower researchers to dissect these pathways with high specificity and reproducibility, accelerating discoveries in cancer, neuroscience, and immunology.
References
- 1. Kikkawa U. 2019. The story of PKC: A discovery marked by unexpected twists and turns.. IUBMB Life 71(6):697-705 PMID: 30393952
- 2. Chun KH et al.. 2021. Protein kinase C-δ interacts with and phosphorylates ARD1.. J Cell Physiol 236(1):379-391 PMID: 32542692
- 3. Wang Q et al.. 2002. The C domain of netrin UNC-6 silences calcium/calmodulin-dependent protein kinase- and diacylglycerol-dependent axon branching in Caenorhabditis elegans.. J Neurosci 22(6):2274-82 PMID: 11896167
- 4. Matthews SA et al.. 2003. Regulation of protein kinase Cnu by the B-cell antigen receptor.. J Biol Chem 278(11):9086-91 PMID: 12506120
- 5. Hirasawa N et al.. 1997. Negative regulation of MAP kinase by diacylglycerol-dependent mechanisms via G protein-coupled receptors in rat basophilic RBL-2H3 (ml) cells.. Cell Signal 9(3-4):319-22 PMID: 9218134
- 6. Foster RH. 2004. Reciprocal influences between the signalling pathways regulating proliferation and steroidogenesis in adrenal glomerulosa cells.. J Mol Endocrinol 32(3):893-902 PMID: 15171720
- 7. Espinoza-Rojo M et al.. 2000. GLAST: gene expression regulation by phorbol esters.. Neuroreport 11(12):2827-32 PMID: 10976971
- 8. Wolfe SA et al.. 2026. Sex-specific disruptions in PKCγ signaling in a mouse model of spinocerebellar ataxia type 14.. JCI Insight 11(10) PMID: 41926327
