GO:0004631 phosphomevalonate kinase activity: Mechanism, Genes and Research Methods
Research-grade guide for scientists and biopharma professionals
Key Takeaways
• GO:0004631 phosphomevalonate kinase activity catalyzes the ATP-dependent phosphorylation of (R)-5-phosphomevalonate to (R)-5-diphosphomevalonate, a key step in the mevalonate pathway.
• The enzyme is conserved from bacteria to humans and is essential for the biosynthesis of isoprenoids, sterols, and other downstream metabolites.
• In humans, phosphomevalonate kinase (PMVK) regulates β-catenin signaling through its product 5-diphosphomevalonate, linking metabolism to cancer pathways.
• PMVK also suppresses CD8+ T cell activation via 4-acetaminobutyric acid, enabling tumor immune escape.
• MicroRNA-874 targets PMVK and inhibits cancer cell growth, highlighting its potential as a therapeutic target.
• CRISPR-based knockout, point mutation, and overexpression models are powerful tools to study PMVK function in health and disease.
Description
Phosphomevalonate kinase activity (GO:0004631) is a molecular function that catalyzes the transfer of a phosphate group from ATP to (R)-5-phosphomevalonate, yielding (R)-5-diphosphomevalonate, ADP, and a proton. This reaction is the fourth step in the mevalonate pathway, a fundamental metabolic route for the synthesis of isoprenoids, cholesterol, and other essential molecules. The enzyme is found in organisms ranging from bacteria to plants and humans, and its activity is critical for maintaining cellular metabolism. In recent years, phosphomevalonate kinase (PMVK) has gained attention for its roles beyond classical metabolism, including regulation of β-catenin signaling and immune evasion in cancer. Understanding this enzyme's mechanism, regulation, and disease connections is therefore of broad interest to researchers in metabolism, oncology, and immunology.
phosphomevalonate kinase activity At A Glance
| GO ID | GO:0004631 |
|---|---|
| GO term | phosphomevalonate kinase activity |
| Ontology | molecular_function |
| Synonym | 5-phosphomevalonate kinase activity; ATP:5-phosphomevalonate phosphotransferase activity; mevalonate-5-phosphate kinase activity |
| Definition | Catalysis of the reaction: (R)-5-phosphomevalonate + ATP = (R)-5-diphosphomevalonate + ADP + H+ |
| Major function | Phosphorylation of (R)-5-phosphomevalonate in the mevalonate pathway |
| EC number | 2.7.1.36 |
| Pathway | Mevalonate pathway (KEGG: hsa00900) |
| Organisms | Bacteria, plants, insects, mammals including human |
What Is GO:0004631?
Phosphomevalonate kinase activity (GO:0004631) is defined as the catalysis of the reaction: (R)-5-phosphomevalonate + ATP = (R)-5-diphosphomevalonate + ADP + H+. In simpler terms, it is the enzyme activity that adds a second phosphate group to mevalonate-5-phosphate, using ATP as the phosphate donor. This activity is synonymous with 5-phosphomevalonate kinase, ATP:5-phosphomevalonate phosphotransferase, and mevalonate phosphate kinase, among others. It is a molecular function classified under the Gene Ontology and is essential for the mevalonate pathway.
Why Is phosphomevalonate kinase activity Important in Cell Biology?
Phosphomevalonate kinase activity is a critical node in the mevalonate pathway, which produces precursors for cholesterol, steroid hormones, vitamin D, and non-sterol isoprenoids such as farnesyl pyrophosphate and geranylgeranyl pyrophosphate. These molecules are essential for cell membrane integrity, protein prenylation, and signaling. Dysregulation of the mevalonate pathway is implicated in cardiovascular disease, cancer, and metabolic disorders. Recent studies have shown that PMVK, the enzyme responsible for this activity, can regulate β-catenin signaling and immune responses, suggesting that its importance extends beyond classical metabolism. Therefore, understanding phosphomevalonate kinase activity is vital for both basic biology and therapeutic development.
• Essential for the mevalonate pathway, which produces cholesterol and isoprenoid precursors.
• Linked to cancer through regulation of β-catenin signaling and tumor immune escape.
• Targeted by microRNA-874, which inhibits cancer cell growth via the mevalonate pathway.
• Plays a role in plant ripening and the MVA/MEP pathway in mango.
• Conserved in bacteria such as Enterococcus faecalis, providing model systems for study.
• Structural studies in Bombyx mori provide insights into substrate binding.
• Can be engineered by single amino acid mutations to alter substrate specificity.
• Human PMVK has been functionally characterized, aiding drug discovery.
Mechanism, Genes and Research Methods
What Happens During phosphomevalonate kinase activity?
In simple terms: The enzyme takes a molecule called 5-phosphomevalonate and adds a phosphate group to it, using ATP as the phosphate source.
Phosphomevalonate kinase catalyzes the transfer of the gamma-phosphate of ATP to the hydroxyl group of (R)-5-phosphomevalonate, producing (R)-5-diphosphomevalonate, ADP, and a proton. This reaction is the fourth step in the mevalonate pathway, following the phosphorylation of mevalonate by mevalonate kinase and the decarboxylation of mevalonate-5-pyrophosphate. The enzyme requires divalent cations such as Mg2+ for activity. The reaction is reversible in vitro but proceeds in the forward direction in vivo due to subsequent metabolic steps.
Substrate Binding and Catalysis
In simple terms: The enzyme grabs the substrate and ATP, positions them perfectly, and then transfers the phosphate.
Structural and biochemical studies of phosphomevalonate kinase from Bombyx mori and Enterococcus faecalis have revealed key residues involved in substrate binding and catalysis. The enzyme undergoes a conformational change upon substrate binding, which aligns the reactive groups for phosphoryl transfer. Site-directed mutagenesis has identified essential amino acids, and single amino acid mutations can convert mevalonate 3-kinase into 5-phosphomevalonate 3-kinase, altering substrate specificity. The human enzyme has been functionally investigated, showing similar catalytic properties.
Role in the Mevalonate Pathway
In simple terms: This enzyme is one step in a chain of reactions that make cholesterol and other important molecules.
The mevalonate pathway starts with acetyl-CoA and produces mevalonate, which is then phosphorylated twice to form 5-diphosphomevalonate. Phosphomevalonate kinase catalyzes the second phosphorylation. The product, 5-diphosphomevalonate, is subsequently decarboxylated to isopentenyl pyrophosphate (IPP), the building block for all isoprenoids. In plants, the MVA pathway interacts with the MEP pathway, and phosphomevalonate kinase regulates this balance during mango ripening. In humans, the pathway is essential for cholesterol synthesis and protein prenylation.
Regulation of Phosphomevalonate Kinase Activity
In simple terms: The activity of this enzyme can be turned up or down by other molecules and signals in the cell.
Phosphomevalonate kinase activity is regulated at multiple levels. In cancer, microRNA-874 directly targets PMVK mRNA and reduces its expression, inhibiting cell growth. The enzyme's product, 5-diphosphomevalonate, can act as a signaling molecule that controls β-catenin stability. Additionally, the mevalonate pathway is subject to feedback regulation by sterols and isoprenoids, which may affect PMVK activity indirectly. In plants, the MVA/MEP pathway is developmentally regulated, with PMVK expression changing during ripening.
Structural Features of Phosphomevalonate Kinase
In simple terms: The enzyme has a specific 3D shape that allows it to bind its substrates and perform the reaction.
Phosphomevalonate kinase belongs to the GHMP kinase superfamily, which includes galactokinase, homoserine kinase, mevalonate kinase, and phosphomevalonate kinase. The enzyme typically forms a dimer or tetramer, with each subunit containing an ATP-binding domain and a substrate-binding pocket. The crystal structure of Bombyx mori PMVK revealed a conserved fold and key residues for substrate recognition. The Enterococcus faecalis enzyme has also been structurally characterized, providing insights into bacterial isoprenoid biosynthesis.
Key Genes Involved in GO:0004631 phosphomevalonate kinase activity
The following genes and proteins are directly involved in phosphomevalonate kinase activity or its regulation.
| Gene | Major Role | Research Relevance |
|---|---|---|
| PMVK (human) | Encodes phosphomevalonate kinase, catalyzes the fourth step of the mevalonate pathway | Cancer, cholesterol metabolism, immune regulation |
| MVK | Mevalonate kinase, catalyzes the third step of the mevalonate pathway | Mevalonate kinase deficiency, a rare autoinflammatory disease |
| MVD | Mevalonate diphosphate decarboxylase, catalyzes the fifth step | Cholesterol biosynthesis, cancer |
| HMGCR | Rate-limiting enzyme of the mevalonate pathway | Target of statins, cholesterol regulation |
| FDPS | Farnesyl diphosphate synthase, downstream of PMVK | Protein prenylation, cancer |
| GGPS1 | Geranylgeranyl diphosphate synthase | Protein prenylation, cancer |
| MIR874 | MicroRNA that targets PMVK mRNA | Cancer cell growth inhibition |
| CTNNB1 | β-catenin, regulated by 5-diphosphomevalonate | Wnt signaling, cancer |
| CD8A | CD8+ T cell marker, affected by 4-acetaminobutyric acid | Tumor immune escape |
| PMVK (Bombyx mori) | Silkworm phosphomevalonate kinase | Structural studies of substrate binding |
| PMVK (Enterococcus faecalis) | Bacterial phosphomevalonate kinase | Model for enzyme mechanism |
| PMVK (mango) | Plant phosphomevalonate kinase | Fruit ripening, MVA/MEP pathway |
| ERG8 (yeast) | Yeast phosphomevalonate kinase | Mevalonate pathway in yeast |
| PMK (plant) | Plant phosphomevalonate kinase | Isoprenoid biosynthesis |
| MVK (bacterial) | Mevalonate kinase in bacteria | Antibiotic target |
| PMVK (insect) | Insect phosphomevalonate kinase | Juvenile hormone biosynthesis |
How Is phosphomevalonate kinase activity Regulated?
Phosphomevalonate kinase activity is regulated at transcriptional, post-transcriptional, and metabolic levels. In humans, microRNA-874 directly binds to the 3' UTR of PMVK mRNA and downregulates its expression, leading to reduced mevalonate pathway flux and inhibition of cancer cell growth. The product of the reaction, 5-diphosphomevalonate, can act as a signaling molecule that stabilizes β-catenin, thereby influencing Wnt signaling. Additionally, the mevalonate pathway is subject to feedback inhibition by sterols, which may indirectly affect PMVK activity. In plants, the MVA/MEP pathway is developmentally regulated, with PMVK expression changing during fruit ripening. In bacteria, the enzyme is part of an operon that is coordinately regulated with other mevalonate pathway genes.
phosphomevalonate kinase activity and Human Disease
| Gene | Disease / Biology | Potential Experimental Model |
|---|---|---|
| PMVK | Tumor immune escape, cancer | PMVK knockout in cancer cell lines (e.g., HeLa, MCF-7) |
| PMVK | β-catenin signaling, cancer | PMVK overexpression and knockout in HEK293T cells |
| PMVK | Cancer cell growth inhibition | MicroRNA-874 mimic transfection in cancer cells |
| MVK | Mevalonate kinase deficiency | MVK knockout in macrophages |
| PMVK (plant) | Fruit ripening | PMVK knockdown in mango fruit |
Cancer and Tumor Immune Escape
Phosphomevalonate kinase (PMVK) has been implicated in cancer progression. In a 2024 study, PMVK was shown to increase the production of 4-acetaminobutyric acid, which suppresses CD8+ T cell activation and allows tumor immune escape. Another study found that PMVK controls β-catenin signaling through its metabolite 5-diphosphomevalonate, promoting cancer cell proliferation. MicroRNA-874 targets PMVK and inhibits cancer cell growth, suggesting that PMVK is a potential therapeutic target.
Metabolic Disorders and Cholesterol Biosynthesis
The mevalonate pathway is essential for cholesterol synthesis, and defects in its enzymes cause metabolic disorders. Although phosphomevalonate kinase deficiency has not been widely reported in humans, mutations in other pathway enzymes such as mevalonate kinase cause mevalonate kinase deficiency, an autoinflammatory disease. PMVK activity is therefore critical for maintaining normal cholesterol levels and preventing related pathologies.
Plant Ripening and Agriculture
In plants, phosphomevalonate kinase regulates the MVA/MEP pathway during mango ripening. This suggests that manipulating PMVK activity could influence fruit quality and ripening times, with potential agricultural applications.
From phosphomevalonate kinase activity-Related Genes to Experimental Models
| Research Question | Suitable Model |
|---|---|
| Does PMVK loss affect cancer cell proliferation? | PMVK knockout in cancer cell lines (e.g., HeLa, A549) |
| Does a specific point mutation alter PMVK substrate specificity? | Point mutation knock-in in PMVK gene (e.g., D204A) |
| Does PMVK overexpression drive β-catenin signaling? | PMVK overexpression in HEK293T cells |
| Does PMVK regulate immune evasion? | PMVK knockout in melanoma cells co-cultured with CD8+ T cells |
| Does PMVK affect plant ripening? | PMVK knockdown in mango fruit |
| Does PMVK interact with other mevalonate pathway enzymes? | Tagged knock-in (e.g., FLAG-PMVK) in mammalian cells |
How to Study the phosphomevalonate kinase activity Process
| Method | What It Measures | Typical Application |
|---|---|---|
| Enzymatic assay | Phosphomevalonate kinase activity | Kinetic characterization, inhibitor screening |
| X-ray crystallography | 3D structure of PMVK | Substrate binding studies |
| RNA-seq | PMVK mRNA expression | Cancer vs normal tissues |
| Metabolomics | Mevalonate pathway intermediates | Flux analysis |
| Western blot | PMVK protein levels | Overexpression/knockout validation |
| CRISPR knockout | Loss of PMVK function | Phenotypic studies |
| Site-directed mutagenesis | Altered enzyme activity | Mechanistic studies |
| Co-immunoprecipitation | Protein-protein interactions | Pathway complex analysis |
Enzymatic Activity Assays
Phosphomevalonate kinase activity can be measured using coupled enzyme assays that monitor ADP production or NADH oxidation. Recombinant human PMVK has been functionally characterized using such methods. These assays are essential for determining kinetic parameters and testing inhibitors.
Structural Biology
X-ray crystallography and cryo-EM have been used to solve the structures of phosphomevalonate kinase from Bombyx mori and Enterococcus faecalis. These studies reveal substrate binding pockets and catalytic residues, guiding mutagenesis experiments.
Gene Expression Analysis
RNA-seq and qPCR can quantify PMVK mRNA levels in different tissues or conditions. For example, PMVK expression was found to be regulated by microRNA-874 in cancer cells. In plants, PMVK expression changes during mango ripening.
Metabolomics
Mass spectrometry-based metabolomics can measure levels of mevalonate pathway intermediates, including 5-phosphomevalonate and 5-diphosphomevalonate, to assess PMVK activity in cells. This approach is useful for linking PMVK function to metabolic flux.
How CRISPR Can Be Used to Study GO:0004631 phosphomevalonate kinase activity
Knockout
CRISPR-Cas9 knockout of PMVK can be used to study its role in cancer cell proliferation, immune evasion, and mevalonate pathway flux. For example, PMVK knockout in melanoma cells reduced 4-acetaminobutyric acid production and restored CD8+ T cell activation. Knockout in HEK293T cells decreased β-catenin signaling.
Point Mutation
Point mutations can be introduced into the PMVK gene to study catalytic residues or substrate specificity. For instance, single amino acid mutations converted mevalonate 3-kinase into 5-phosphomevalonate 3-kinase, altering substrate preference. Similar approaches can be applied to human PMVK to dissect its mechanism.
Knock-in
Knock-in of tagged PMVK (e.g., FLAG or GFP) allows for localization and interaction studies. This can be achieved by CRISPR-mediated homology-directed repair. Tagged PMVK can be used to pull down interacting proteins and study its role in the mevalonate pathway complex.
Overexpression
CRISPR activation (CRISPRa) or lentiviral overexpression can increase PMVK levels to study its effects on β-catenin signaling and cancer cell growth. Overexpression of PMVK in HEK293T cells increased 5-diphosphomevalonate levels and stabilized β-catenin.
How EDITGENE Supports phosphomevalonate kinase activity Research
Researchers studying phosphomevalonate kinase activity-related genes often need to determine whether a candidate gene is causally involved in a specific phenotype, such as cancer cell proliferation or immune evasion. EDITGENE provides a comprehensive suite of CRISPR services to enable such investigations, from knockout to precise point mutations and overexpression.
Contact EDITGENE today to design your custom CRISPR model for phosphomevalonate kinase activity research.
Frequently Asked Questions About phosphomevalonate kinase activity
What is phosphomevalonate kinase activity?
Phosphomevalonate kinase activity (GO:0004631) is the enzyme activity that catalyzes the phosphorylation of (R)-5-phosphomevalonate to (R)-5-diphosphomevalonate using ATP, a step in the mevalonate pathway.
What genes are involved in phosphomevalonate kinase activity?
The primary gene is PMVK, which encodes phosphomevalonate kinase. Other mevalonate pathway genes include MVK, MVD, HMGCR, and FDPS.
What diseases are associated with phosphomevalonate kinase?
PMVK has been linked to cancer progression, tumor immune escape, and β-catenin signaling. Deficiencies in other mevalonate pathway enzymes cause metabolic disorders.
How is phosphomevalonate kinase regulated?
It is regulated by microRNA-874, feedback inhibition by sterols, and developmental signals in plants.
What is the role of PMVK in cancer?
PMVK promotes cancer cell proliferation and immune evasion by producing metabolites that suppress T cell activation and stabilize β-catenin.
Can CRISPR be used to study phosphomevalonate kinase?
Yes, CRISPR knockout, point mutation, knock-in, and overexpression models are powerful tools to study PMVK function in cells and animals.
What is the mevalonate pathway?
The mevalonate pathway is a metabolic route that produces cholesterol, isoprenoids, and other essential molecules. Phosphomevalonate kinase catalyzes the fourth step.
What are the substrates of phosphomevalonate kinase?
The substrates are (R)-5-phosphomevalonate and ATP. The products are (R)-5-diphosphomevalonate, ADP, and H+.
Is phosphomevalonate kinase conserved across species?
Yes, it is found in bacteria, plants, insects, and mammals, including humans.
How can I measure phosphomevalonate kinase activity?
Enzymatic assays, metabolomics, and structural studies can measure activity. EDITGENE offers CRISPR services to create relevant cell models.
Conclusion
Phosphomevalonate kinase activity (GO:0004631) is a fundamental enzymatic function in the mevalonate pathway, with critical roles in cholesterol synthesis, isoprenoid production, and emerging functions in cancer and immunity. Its product, 5-diphosphomevalonate, serves as both a metabolic intermediate and a signaling molecule. Understanding its regulation and disease connections requires robust experimental models, which can be efficiently generated using CRISPR technologies. EDITGENE provides comprehensive services to support such research, from knockout to overexpression, enabling precise interrogation of PMVK biology.
References
- 1. Zhou X et al.. 2024. Increases in 4-Acetaminobutyric Acid Generated by Phosphomevalonate Kinase Suppress CD8(+) T Cell Activation and Allow Tumor Immune Escape.. Adv Sci (Weinh) 11(43):e2403629 PMID: 39325640
- 2. Doun SS et al.. 2005. Enterococcus faecalis phosphomevalonate kinase.. Protein Sci 14(5):1134-9 PMID: 15802646
- 3. Chen Z et al.. 2023. Phosphomevalonate Kinase Controls β-Catenin Signaling via the Metabolite 5-Diphosphomevalonate.. Adv Sci (Weinh) 10(12):e2204909 PMID: 36808719
- 4. Pathak G et al.. 2023. Phosphomevalonate kinase regulates the MVA/MEP pathway in mango during ripening.. Plant Physiol Biochem 196:174-185 PMID: 36724702
- 5. Motoyama K et al.. 2019. Conversion of Mevalonate 3-Kinase into 5-Phosphomevalonate 3-Kinase by Single Amino Acid Mutations.. Appl Environ Microbiol 85(9) PMID: 30824437
- 6. Zhang H et al.. 2022. Structural insights into the substrate binding of phosphomevalonate kinase from the silkworm, Bombyx mori.. Insect Biochem Mol Biol 150:103849 PMID: 36209956
- 7. Aersilan A et al.. 2022. MicroRNA-874 targets phosphomevalonate kinase and inhibits cancer cell growth via the mevalonate pathway.. Sci Rep 12(1):18443 PMID: 36323841
- 8. Herdendorf TJ et al.. 2006. Phosphomevalonate kinase: functional investigation of the recombinant human enzyme.. Biochemistry 45(10):3235-42 PMID: 16519518
