GO:0120557 farnesyl diphosphatase activity: Mechanism, Genes and Research Methods
Research-grade guide for scientists and biopharma professionals
Key Takeaways
• GO:0120557 farnesyl diphosphatase activity is a molecular function that catalyzes the hydrolysis of (2E,6E)-farnesyl diphosphate to (2E,6E)-farnesyl phosphate, phosphate, and a proton.
• This activity was first partially characterized in plants, where it is induced by UV-C irradiation, suggesting a role in stress responses.
• The enzyme participates in the regulation of isoprenoid biosynthesis, influencing sterol and triterpene production in plant cell cultures.
• Inhibition of downstream enzymes like squalene synthase and squalene epoxidase can up-regulate upstream enzymes such as HMG-CoA reductase, indicating feedback regulation of the pathway.
• Research on farnesyl diphosphatase activity is relevant to agriculture, biofuel production, and understanding of plant defense mechanisms [1,2].
• Studying this activity requires biochemical assays, genetic manipulation, and analytical techniques like HPLC and mass spectrometry [1,2].
Description
Farnesyl diphosphatase activity (GO:0120557) is a molecular function that catalyzes the hydrolysis of (2E,6E)-farnesyl diphosphate (FPP) to (2E,6E)-farnesyl phosphate, inorganic phosphate, and a proton. This reaction is part of the mevalonate pathway, which produces isoprenoid precursors for sterols, triterpenes, and other secondary metabolites. The activity was initially identified in rice seedlings subjected to UV-C irradiation, where it may play a role in redirecting isoprenoid flux under stress. Understanding farnesyl diphosphatase activity is important because it sits at a branch point between the synthesis of sterols and the production of defense-related compounds. In plant cell suspension cultures of Uncaria tomentosa, the balance between sterol and triterpene biosynthesis is tightly regulated, and farnesyl diphosphatase could influence this balance. Furthermore, inhibition of squalene synthase and squalene epoxidase in tobacco cells leads to up-regulation of 3-hydroxy-3-methylglutaryl coenzyme A reductase, indicating that feedback mechanisms exist to maintain isoprenoid homeostasis. Thus, farnesyl diphosphatase activity may be a key node in the regulation of the mevalonate pathway, with implications for both basic plant biology and biotechnological applications.
farnesyl diphosphatase activity At A Glance
| GO ID | GO:0120557 |
|---|---|
| GO term | farnesyl diphosphatase activity |
| Ontology | molecular_function |
| Synonym | none |
| Major function | Catalysis of the hydrolysis of (2E,6E)-farnesyl diphosphate to (2E,6E)-farnesyl phosphate, phosphate, and H+ |
| Reaction | (2E,6E)-farnesyl diphosphate + H2O = (2E,6E)-farnesyl phosphate + phosphate + H+ |
| Substrate | (2E,6E)-farnesyl diphosphate |
| Products | (2E,6E)-farnesyl phosphate, phosphate, H+ |
| Induction | Induced by UV-C irradiation in rice seedlings |
| Pathway | Mevalonate pathway / isoprenoid biosynthesis |
What Is GO:0120557?
Farnesyl diphosphatase activity (GO:0120557) is defined as the catalysis of the reaction: (2E,6E)-farnesyl diphosphate + H2O = (2E,6E)-farnesyl phosphate + phosphate + H+. This enzymatic activity removes one phosphate group from farnesyl diphosphate, yielding farnesyl phosphate and free phosphate. It is a hydrolytic reaction that belongs to the class of diphosphatases. The activity was partially characterized in rice seedlings, where it is induced by UV-C irradiation, suggesting a role in plant stress responses.
Why Is farnesyl diphosphatase activity Important in Cell Biology?
Farnesyl diphosphatase activity is important because it modulates the pool of farnesyl diphosphate, a central intermediate in the mevalonate pathway that is used for the synthesis of sterols, triterpenes, and prenylated proteins. By converting FPP to farnesyl phosphate, this enzyme may regulate the flux of isoprenoids toward different end products. In plants, the activity is induced by UV-C irradiation, indicating a role in stress responses and defense compound production. In cell suspension cultures of Uncaria tomentosa, the balance between sterol and triterpene biosynthesis is critical for growth and secondary metabolite production, and farnesyl diphosphatase could influence this balance. Additionally, feedback regulation of the mevalonate pathway, as shown by the up-regulation of HMG-CoA reductase upon inhibition of squalene synthase and squalene epoxidase, highlights the importance of enzymes like farnesyl diphosphatase in maintaining metabolic homeostasis. Understanding this activity can aid in metabolic engineering for increased production of valuable isoprenoids.
• Regulates the pool of farnesyl diphosphate, a key precursor for sterols, triterpenes, and prenylated proteins.
• Induced by UV-C irradiation, suggesting a role in plant stress defense.
• May influence the balance between sterol and triterpene biosynthesis in plant cell cultures.
• Participates in feedback regulation of the mevalonate pathway, as indicated by up-regulation of HMG-CoA reductase upon downstream inhibition.
• Potential target for metabolic engineering to enhance production of isoprenoid-derived pharmaceuticals and biofuels.
• Relevant to agriculture for improving stress tolerance in crops.
• Provides a branch point for redirecting carbon flux toward defense compounds.
• Could be involved in the regulation of protein prenylation by altering FPP availability.
• May serve as a biomarker for UV stress in plants.
• Offers a tool for studying isoprenoid homeostasis in eukaryotic cells.
Molecular Mechanism of farnesyl diphosphatase activity
Substrate recognition and binding
In simple terms: The enzyme grabs farnesyl diphosphate and holds it in place.
Farnesyl diphosphatase specifically binds (2E,6E)-farnesyl diphosphate, the substrate for the reaction. The enzyme likely recognizes the diphosphate moiety and the hydrophobic farnesyl chain, positioning the substrate for hydrolysis. This specificity ensures that other isoprenoid diphosphates are not prematurely hydrolyzed, maintaining metabolic fidelity.
Catalytic hydrolysis
In simple terms: Water attacks the phosphate bond, splitting off a phosphate group.
The catalytic mechanism involves the nucleophilic attack of water on the terminal phosphate of farnesyl diphosphate, resulting in the release of (2E,6E)-farnesyl phosphate, inorganic phosphate, and a proton. This hydrolysis reaction is typical of diphosphatases and may require divalent metal ions for catalysis, although specific cofactors have not been fully characterized for this enzyme.
Product release and fate
In simple terms: The products are released and can be used in other reactions.
After catalysis, farnesyl phosphate and phosphate are released. Farnesyl phosphate can be further dephosphorylated to farnesol, which may serve as a signaling molecule or be incorporated into other metabolites. The inorganic phosphate enters the cellular phosphate pool. The proton released contributes to local pH changes, which may affect enzyme activity.
Regulation by UV-C and stress
In simple terms: UV light turns up the enzyme's activity.
In rice seedlings, farnesyl diphosphatase activity is induced by UV-C irradiation, suggesting that the enzyme is part of a stress response pathway. This induction may lead to increased production of defense-related isoprenoids, such as phytoalexins, by redirecting FPP away from sterol biosynthesis.
Feedback regulation in the mevalonate pathway
In simple terms: When downstream steps are blocked, upstream enzymes increase to compensate.
Inhibition of squalene synthase and squalene epoxidase in tobacco cells triggers an up-regulation of HMG-CoA reductase, indicating that the mevalonate pathway is subject to feedback regulation. Farnesyl diphosphatase may contribute to this regulation by modulating FPP levels, which could act as a signal for pathway flux.
Key Genes Involved in GO:0120557 farnesyl diphosphatase activity
The following genes and proteins are associated with farnesyl diphosphatase activity or the mevalonate pathway in which it operates, based on published plant studies.
| Gene | Major Role | Research Relevance |
|---|---|---|
| Farnesyl diphosphatase (uncharacterized gene) | Catalyzes hydrolysis of farnesyl diphosphate to farnesyl phosphate | Directly responsible for GO:0120557 activity; induced by UV-C in rice |
| HMG-CoA reductase (HMGR) | Rate-limiting enzyme in mevalonate pathway | Up-regulated upon inhibition of downstream enzymes; feedback regulation |
| Squalene synthase (SQS) | Converts farnesyl diphosphate to squalene | Inhibition leads to HMGR up-regulation; branch point for sterol biosynthesis |
| Squalene epoxidase (SQE) | Oxidizes squalene to 2,3-oxidosqualene | Inhibition triggers HMGR up-regulation; sterol biosynthesis |
| Farnesyl diphosphate synthase (FPPS) | Synthesizes farnesyl diphosphate from isopentenyl diphosphate and dimethylallyl diphosphate | Provides substrate for farnesyl diphosphatase |
| Geranylgeranyl diphosphatase | Hydrolyzes geranylgeranyl diphosphate | Related diphosphatase activity; may compete for similar substrates |
| Cycloartenol synthase | Converts 2,3-oxidosqualene to cycloartenol | Sterol biosynthesis in plants; may be affected by FPP pool |
| β-Amyrin synthase | Converts 2,3-oxidosqualene to β-amyrin | Triterpene biosynthesis; branch from sterol pathway |
| Sterol methyltransferase | Methylates sterols | Sterol modification; downstream of squalene epoxidase |
| Phytoene synthase | Condenses geranylgeranyl diphosphate to phytoene | Carotenoid biosynthesis; uses GGPP, not FPP |
| Protein farnesyltransferase | Prenylates proteins with farnesyl group | Competes with farnesyl diphosphatase for FPP |
| Protein geranylgeranyltransferase | Prenylates proteins with geranylgeranyl group | Uses GGPP; may be affected by FPP/GGPP balance |
| CYP51 (sterol 14α-demethylase) | Demethylates sterols | Sterol biosynthesis; potential feedback regulation |
| 3-Hydroxy-3-methylglutaryl-CoA synthase | Condenses acetyl-CoA to HMG-CoA | Upstream of HMGR; mevalonate pathway |
| Mevalonate kinase | Phosphorylates mevalonate | Mevalonate pathway; potential regulation |
| Phosphomevalonate kinase | Phosphorylates mevalonate-5-phosphate | Mevalonate pathway |
| Mevalonate diphosphate decarboxylase | Decarboxylates mevalonate diphosphate to IPP | Mevalonate pathway |
| Isopentenyl diphosphate isomerase | Interconverts IPP and DMAPP | Provides substrates for FPPS |
How Is farnesyl diphosphatase activity Regulated?
Farnesyl diphosphatase activity is regulated at multiple levels. In rice seedlings, the activity is induced by UV-C irradiation, indicating transcriptional or post-translational regulation in response to stress. The mevalonate pathway, in which this enzyme operates, is subject to feedback regulation; inhibition of squalene synthase and squalene epoxidase leads to up-regulation of HMG-CoA reductase, suggesting that flux through the pathway is monitored and adjusted. Additionally, the availability of farnesyl diphosphate, the substrate for farnesyl diphosphatase, is controlled by the activity of upstream enzymes such as FPPS and by competition with prenyltransferases. Hormonal and developmental signals may also influence the expression of the enzyme, although specific regulators have not been fully elucidated in the cited studies.
farnesyl diphosphatase activity and Human Disease
| Gene | Disease / Biology | Potential Experimental Model |
|---|---|---|
| Farnesyl diphosphatase (uncharacterized) | Plant UV stress response | Rice or Arabidopsis knockout lines |
| HMG-CoA reductase | Cardiovascular disease (cholesterol) | Human cell lines with statin treatment |
| Squalene synthase | Hypercholesterolemia | Hepatocyte knockout models |
| Squalene epoxidase | Fungal infections (target of terbinafine) | Yeast or fungal knockout strains |
| Farnesyl diphosphate synthase | Bone diseases (bisphosphonate target) | Osteoclast cultures |
Cancer and cell proliferation
While direct evidence linking farnesyl diphosphatase activity to cancer is limited, the mevalonate pathway is often dysregulated in cancer cells to support rapid proliferation. Farnesyl diphosphate is required for prenylation of oncoproteins such as RAS, and enzymes that modulate FPP levels could influence tumor growth. However, no specific studies on farnesyl diphosphatase in cancer were found in the verified citations.
Plant defense and stress responses
In plants, farnesyl diphosphatase activity is induced by UV-C irradiation, suggesting a role in defense against abiotic stress. The enzyme may redirect isoprenoid flux toward the production of protective compounds such as phytoalexins and triterpenes, which have antimicrobial and antioxidant properties. This makes it a potential target for engineering stress-tolerant crops.
Metabolic disorders and isoprenoid biosynthesis
Disruptions in the mevalonate pathway can lead to metabolic disorders in humans, such as mevalonate kinase deficiency. Although farnesyl diphosphatase has not been directly implicated, its role in regulating FPP levels could affect the balance of sterols and non-sterol isoprenoids, which are important for cellular functions. Further research is needed to establish any direct link.
From farnesyl diphosphatase activity-Related Genes to Experimental Models
| Research Question | Suitable Model |
|---|---|
| What is the effect of farnesyl diphosphatase knockout on plant growth? | Arabidopsis or rice knockout lines |
| How does UV-C induction of farnesyl diphosphatase affect isoprenoid profiles? | Rice seedlings with overexpression or knockout |
| Does farnesyl diphosphatase interact with HMG-CoA reductase feedback regulation? | Tobacco cell cultures with enzyme inhibitors |
| Can farnesyl diphosphatase modulate triterpene production in Uncaria tomentosa? | Cell suspension cultures with gene silencing |
| What is the subcellular localization of farnesyl diphosphatase? | GFP-tagged knock-in in plant cells |
| Does farnesyl diphosphatase affect protein prenylation? | Mammalian cells with overexpression |
How to Study the farnesyl diphosphatase activity Process
| Method | What It Measures | Typical Application |
|---|---|---|
| Radioactive assay with [3H]FPP | Enzyme activity | Kinetic characterization |
| Colorimetric phosphate assay | Inorganic phosphate release | High-throughput screening |
| RT-qPCR | mRNA expression | UV-C induction studies |
| GC-MS | Sterol and triterpene profiles | Metabolic flux analysis |
| LC-MS | Isoprenoid intermediates | Pathway regulation |
| Western blot | Protein levels | Overexpression validation |
| CRISPR/Cas9 knockout | Gene function | Phenotypic analysis |
| RNAi knockdown | Gene silencing | Loss-of-function studies |
Biochemical assays for diphosphatase activity
Farnesyl diphosphatase activity can be measured using radiolabeled or fluorescently labeled farnesyl diphosphate as a substrate, followed by separation of products by thin-layer chromatography or HPLC. The release of inorganic phosphate can be quantified using a colorimetric assay. These methods allow determination of kinetic parameters and substrate specificity.
Gene expression analysis
Transcript levels of the gene encoding farnesyl diphosphatase can be assessed by RT-qPCR or RNA-seq, especially after UV-C treatment. This helps determine if the activity is regulated transcriptionally. In plant cell cultures, expression of mevalonate pathway genes can be monitored to study feedback regulation.
Metabolite profiling
Isoprenoid intermediates and end products can be analyzed by GC-MS or LC-MS to assess the impact of farnesyl diphosphatase activity on metabolic flux. For example, sterol and triterpene levels can be quantified in cell cultures. This provides a systems-level view of pathway regulation.
Genetic manipulation
Knockout, knockdown, or overexpression of the farnesyl diphosphatase gene in model plants can reveal its physiological function. CRISPR/Cas9 or RNAi approaches are suitable. Complementation studies can confirm specificity. Such experiments link the enzyme activity to phenotypes like stress tolerance or secondary metabolite production.
How CRISPR Can Be Used to Study GO:0120557 farnesyl diphosphatase activity
Knockout
CRISPR/Cas9 can be used to generate knockout lines of the farnesyl diphosphatase gene in plants such as rice or Arabidopsis. These lines would lack the enzyme activity, allowing researchers to study its role in isoprenoid biosynthesis, stress responses, and growth. Knockout lines can be analyzed for changes in sterol and triterpene levels, as well as sensitivity to UV-C irradiation.
Point Mutation
Point mutations can be introduced into the catalytic residues of farnesyl diphosphatase to dissect its mechanism. For example, mutating putative active-site residues could abolish activity without affecting protein stability. Such mutants can be expressed in a knockout background to confirm the importance of specific amino acids for catalysis.
Knock-in
Knock-in of a tagged version of farnesyl diphosphatase (e.g., GFP or FLAG) can be achieved via CRISPR-mediated homology-directed repair. This allows visualization of subcellular localization and protein interaction studies. Tagged knock-in lines can also be used to monitor enzyme levels under different conditions.
Overexpression
Overexpression of farnesyl diphosphatase can be achieved by CRISPR activation (CRISPRa) or by inserting a strong promoter. Overexpressing lines may show increased flux toward farnesyl phosphate and altered isoprenoid profiles. This approach can test whether the enzyme is rate-limiting for specific branches of the mevalonate pathway.
How EDITGENE Supports farnesyl diphosphatase activity Research
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Frequently Asked Questions About farnesyl diphosphatase activity
What is farnesyl diphosphatase activity?
Farnesyl diphosphatase activity (GO:0120557) is a molecular function that catalyzes the hydrolysis of (2E,6E)-farnesyl diphosphate to (2E,6E)-farnesyl phosphate, phosphate, and a proton.
What genes are involved in farnesyl diphosphatase activity?
The gene encoding farnesyl diphosphatase itself is not yet fully characterized, but the activity is linked to the mevalonate pathway genes such as HMG-CoA reductase, squalene synthase, and squalene epoxidase [1,3].
What is the reaction catalyzed by farnesyl diphosphatase?
The reaction is: (2E,6E)-farnesyl diphosphate + H2O = (2E,6E)-farnesyl phosphate + phosphate + H+.
How is farnesyl diphosphatase activity regulated?
It is induced by UV-C irradiation in rice seedlings and may be subject to feedback regulation through the mevalonate pathway [1,3].
What is the role of farnesyl diphosphatase in plants?
It may redirect isoprenoid flux toward defense compounds and influence sterol and triterpene biosynthesis [1,2].
Is farnesyl diphosphatase involved in human disease?
No direct link has been established, but the mevalonate pathway is relevant to cancer and metabolic disorders [2,3].
How can I study farnesyl diphosphatase activity?
Biochemical assays with radiolabeled FPP, gene expression analysis, and metabolite profiling are common methods [1,2].
What model organisms are used to study farnesyl diphosphatase?
Rice, tobacco, and Uncaria tomentosa cell cultures have been used in published studies [1,2,3].
What are the products of farnesyl diphosphatase?
The products are (2E,6E)-farnesyl phosphate, inorganic phosphate, and a proton.
Can CRISPR be used to study farnesyl diphosphatase?
Yes, CRISPR knockout, knock-in, and overexpression models can be generated to study its function [1,2].
Conclusion
Farnesyl diphosphatase activity (GO:0120557) is a key enzymatic function in the mevalonate pathway, modulating the pool of farnesyl diphosphate and influencing the biosynthesis of sterols, triterpenes, and other isoprenoids [1,2]. Its induction by UV-C irradiation suggests a role in plant stress responses, while feedback regulation of the pathway highlights its importance in metabolic homeostasis [1,3]. Although direct links to human disease are not yet established, the pathway is relevant to cancer and metabolic disorders [2,3]. Future research using CRISPR-based models will help elucidate the precise physiological roles of this enzyme and its potential for metabolic engineering.
References
- 1. Nah J et al.. 2001. Partial characterization of farnesyl and geranylgeranyl diphosphatases induced in rice seedlings by UV-C irradiation.. Plant Cell Physiol 42(8):864-7 PMID: 11522913
- 2. Flores-Sánchez IJ et al.. 2002. Biosynthesis of sterols and triterpenes in cell suspension cultures of Uncaria tomentosa.. Plant Cell Physiol 43(12):1502-9 PMID: 12514247
- 3. Wentzinger LF et al.. 2002. Inhibition of squalene synthase and squalene epoxidase in tobacco cells triggers an up-regulation of 3-hydroxy-3-methylglutaryl coenzyme a reductase.. Plant Physiol 130(1):334-46 PMID: 12226513
