GO:0102149 farnesylcysteine lyase activity: Mechanism, Genes and Research Methods
Research-grade guide for scientists and biopharma professionals
Key Takeaways
• GO:0102149 farnesylcysteine lyase activity catalyzes the oxidative cleavage of S-farnesyl-L-cysteine to farnesal, L-cysteine, and H2O2.
• The enzyme is a key component of the prenylcysteine recycling pathway that removes farnesyl groups from modified proteins.
• In Arabidopsis, farnesylcysteine lyase negatively regulates abscisic acid signaling, linking prenylcysteine metabolism to plant hormone responses.
• Mouse prenylcysteine lyase deficiency leads to accumulation of farnesylcysteine and geranylgeranylcysteine in brain and liver, demonstrating its role in prenylcysteine catabolism in mammals.
• Farnesal produced by the lyase can be further metabolized by farnesol dehydrogenase, connecting the pathway to isoprenoid homeostasis.
• Research on this enzyme benefits from CRISPR knockout, point mutation, and overexpression models to dissect its physiological functions.
Description
Farnesylcysteine lyase activity (GO:0102149) is a molecular function that catalyzes the oxidative cleavage of S-farnesyl-L-cysteine, releasing farnesal, L-cysteine, and hydrogen peroxide. This enzymatic activity is part of the prenylcysteine recycling pathway, which is essential for the turnover of prenylated proteins and the detoxification of prenylcysteine residues. The enzyme was first characterized in plants and later identified in mammals, where its deficiency leads to the accumulation of prenylcysteines in tissues. Understanding farnesylcysteine lyase activity is important for researchers studying protein prenylation, isoprenoid metabolism, and related signaling pathways.
farnesylcysteine lyase activity At A Glance
| GO ID | GO:0102149 |
|---|---|
| GO term | farnesylcysteine lyase activity |
| Ontology | molecular_function |
| Synonym | none |
| Major function | Catalyzes the oxidative cleavage of S-farnesyl-L-cysteine to farnesal, L-cysteine, and H2O2 |
| Reaction | S-[(2E,6E)-farnesyl]-L-cysteine + O2 + H2O = (2-trans,6-trans)-farnesal + L-cysteine + H2O2 |
| Substrates | S-farnesyl-L-cysteine, oxygen, water |
| Products | farnesal, L-cysteine, hydrogen peroxide |
| Pathway | Prenylcysteine recycling / detoxification |
What Is GO:0102149?
Farnesylcysteine lyase activity is defined as the catalysis of the reaction: S-[(2E,6E)-farnesyl]-L-cysteine + O2 + H2O = (2-trans,6-trans)-farnesal + L-cysteine + H2O2. In other words, it is an enzyme that uses molecular oxygen and water to break down farnesylcysteine into farnesal, cysteine, and hydrogen peroxide.
Why Is farnesylcysteine lyase activity Important in Cell Biology?
Farnesylcysteine lyase activity is crucial for the catabolism of prenylated proteins, which are involved in numerous cellular processes including signal transduction, membrane trafficking, and cell cycle regulation. By removing farnesyl groups from cysteine residues, the enzyme helps recycle prenylcysteines and prevent their toxic accumulation. In plants, it plays a specific role in negative regulation of abscisic acid signaling, affecting stress responses and development. In mammals, deficiency of this enzyme leads to accumulation of farnesylcysteine and geranylgeranylcysteine in brain and liver, highlighting its importance in normal physiology. Thus, studying this activity provides insights into protein prenylation dynamics and related diseases.
• Regulates abscisic acid signaling in plants, influencing drought stress responses.
• Prevents accumulation of prenylcysteines, which can be toxic in mammals.
• Participates in detoxification and recycling of farnesylcysteine.
• Connects to isoprenoid metabolism via farnesal production.
• Potential target for modulating protein prenylation in cancer and neurodegenerative diseases.
• Provides a model for studying enzyme-catalyzed oxidative cleavage reactions.
• Relevant to understanding the role of prenylated proteins in cellular signaling.
• May influence membrane association and function of small GTPases.
• Contributes to redox balance by producing H2O2.
• Offers a tool for genetic studies of prenylcysteine metabolism using CRISPR.
What Happens During farnesylcysteine lyase activity?
Substrate Recognition and Binding
In simple terms: The enzyme grabs onto a molecule called farnesylcysteine.
Farnesylcysteine lyase specifically binds S-farnesyl-L-cysteine, the substrate generated from the proteolytic degradation of farnesylated proteins. The enzyme likely recognizes the farnesyl moiety and the cysteine backbone, ensuring specificity for farnesylated over geranylgeranylated substrates in some organisms.
Oxidative Cleavage
In simple terms: Oxygen and water help break the molecule apart.
The enzyme catalyzes the oxidative cleavage of the thioether bond in S-farnesyl-L-cysteine using molecular oxygen and water, yielding farnesal, L-cysteine, and hydrogen peroxide. This reaction is a key step in the detoxification and recycling of farnesylcysteine.
Product Release and Recycling
In simple terms: The products are released and can be reused or further processed.
After cleavage, farnesal is released and can be further metabolized by farnesol dehydrogenase to farnesol or other isoprenoids. L-Cysteine is recycled into cellular pools, and hydrogen peroxide contributes to redox signaling.
Physiological Context
In simple terms: This process happens inside cells to manage prenylated proteins.
In Arabidopsis, farnesylcysteine lyase activity is involved in negative regulation of abscisic acid signaling, affecting seed germination and stress responses. In mammals, the enzyme is active in brain and liver, where its deficiency leads to accumulation of prenylcysteines.
Key Genes Involved in GO:0102149 farnesylcysteine lyase activity
The following genes and proteins are directly associated with farnesylcysteine lyase activity or its substrate and product metabolism.
| Gene | Major Role | Research Relevance |
|---|---|---|
| AtFCLY (Arabidopsis thaliana) | Encodes farnesylcysteine lyase | Model for plant ABA signaling and prenylcysteine detoxification |
| Pcly (mouse) | Encodes prenylcysteine lyase | Knockout shows accumulation of prenylcysteines in brain and liver |
| AtFDL (Arabidopsis thaliana) | Farnesol dehydrogenase | Metabolizes farnesal produced by farnesylcysteine lyase |
| RCE1 | Prenylcysteine protease | Generates farnesylcysteine substrate for the lyase |
| ICMT | Isoprenylcysteine carboxyl methyltransferase | Methylates prenylcysteines, competing with lyase |
| HDAC6 | Histone deacetylase | May regulate prenylation status indirectly |
| Rho GTPases | Prenylated signaling proteins | Substrates for prenylation and subsequent lyase action |
| Ras | Prenylated oncoprotein | Farnesylation and recycling linked to cancer |
| Rab GTPases | Prenylated membrane trafficking proteins | Geranylgeranylated, but related pathways |
| ABI1 | ABA signaling phosphatase | Affected by farnesylcysteine lyase in plants |
| PP2C | Protein phosphatase 2C | Component of ABA signaling regulated by farnesylcysteine |
| SnRK2 | ABA-activated kinase | Downstream of farnesylcysteine lyase in ABA signaling |
| Farnesol dehydrogenase | Oxidizes farnesol to farnesal | Links lyase to isoprenoid metabolism |
| CYP450 | Potential farnesal metabolizing enzymes | May further process farnesal |
| GDI | GDP dissociation inhibitor | Regulates prenylated Rab proteins |
| Prenyltransferase | Adds farnesyl groups to proteins | Upstream of lyase in prenylation cycle |
| CAAX protease | Removes CAAX tripeptide | Produces farnesylcysteine for lyase |
How Is farnesylcysteine lyase activity Regulated?
Farnesylcysteine lyase activity is regulated at multiple levels. In Arabidopsis, its expression and activity are modulated by abscisic acid signaling, where it acts as a negative regulator. The enzyme's substrate availability depends on the rate of protein prenylation and subsequent proteolysis. In mammals, prenylcysteine lyase deficiency leads to accumulation of substrates, suggesting feedback or saturation effects. Additionally, the product farnesal can be further metabolized by farnesol dehydrogenase, which may influence flux through the pathway.
farnesylcysteine lyase activity and Human Disease
| Gene | Disease / Biology | Potential Experimental Model |
|---|---|---|
| Pcly (mouse) | Prenylcysteine accumulation in brain and liver | Knockout mouse |
| AtFCLY | Altered ABA signaling and stress response | Arabidopsis knockout |
| Ras | Cancer | Knock-in of farnesylated Ras in cell lines |
| Rho GTPases | Cancer and metastasis | Overexpression of prenylated Rho |
| ABI1 | ABA signaling defects | Point mutation in Arabidopsis |
Prenylcysteine Lyase Deficiency in Mammals
Mice lacking prenylcysteine lyase exhibit accumulation of farnesylcysteine and geranylgeranylcysteine in brain and liver, indicating that the enzyme is critical for prenylcysteine catabolism. This accumulation may contribute to cellular toxicity and has implications for neurological and hepatic disorders.
Cancer and Protein Prenylation
Protein prenylation is essential for the function of oncoproteins such as Ras. Farnesylcysteine lyase activity contributes to the turnover of prenylated proteins, and its dysregulation could affect cancer cell signaling. However, direct evidence linking the lyase to cancer remains to be established.
Plant Stress Responses
In Arabidopsis, farnesylcysteine lyase negatively regulates abscisic acid signaling, which controls drought stress responses and seed germination. Mutants with altered lyase activity show changes in ABA sensitivity, linking the enzyme to plant stress adaptation.
From farnesylcysteine lyase activity-Related Genes to Experimental Models
| Research Question | Suitable Model |
|---|---|
| What is the effect of farnesylcysteine lyase loss on prenylcysteine levels? | Knockout mouse or Arabidopsis knockout |
| How does a point mutation in the catalytic site affect enzyme activity? | Point mutation knock-in in cell lines |
| Can farnesylcysteine lyase be tagged for localization studies? | Knock-in of fluorescent tag |
| What happens when farnesylcysteine lyase is overexpressed? | Overexpression cell lines or transgenic plants |
| Which genes interact with farnesylcysteine lyase? | CRISPR library screening |
| How does farnesylcysteine lyase affect ABA signaling? | Arabidopsis mutants |
How to Study the farnesylcysteine lyase activity Process
| Method | What It Measures | Typical Application |
|---|---|---|
| HPLC | Farnesal production | Enzyme kinetics |
| LC-MS/MS | Prenylcysteine levels | Metabolite profiling |
| CRISPR knockout | Gene function | Loss-of-function studies |
| Western blot | Protein prenylation | Signaling studies |
| Fluorescence microscopy | Subcellular localization | Tagged enzyme imaging |
| RNA-seq | Transcriptional changes | Pathway analysis |
| Ribo-seq | Translation efficiency | Gene expression regulation |
Enzymatic Activity Assays
Farnesylcysteine lyase activity can be measured using substrate S-farnesyl-L-cysteine and monitoring the production of farnesal or H2O2 by HPLC or fluorescence. These assays are essential for characterizing enzyme kinetics and inhibitor studies.
Genetic Knockout and Knockdown
CRISPR-Cas9 knockout of the gene encoding farnesylcysteine lyase in model organisms such as Arabidopsis or mice allows assessment of its physiological role. Knockdown using RNAi can also be used for transient studies.
Metabolite Profiling
Mass spectrometry-based metabolomics can quantify farnesylcysteine, geranylgeranylcysteine, and farnesal levels in tissues, providing insights into pathway flux.
Protein Prenylation Analysis
Prenylation status of proteins can be analyzed by Western blot with anti-farnesyl antibodies or by metabolic labeling with 3H-mevalonate, linking lyase activity to prenylation dynamics.
How CRISPR Can Be Used to Study GO:0102149 farnesylcysteine lyase activity
Knockout
CRISPR knockout of farnesylcysteine lyase genes in Arabidopsis or mice has been used to study its role in ABA signaling and prenylcysteine accumulation. Knockout models show altered phenotypes such as ABA hypersensitivity in plants and tissue accumulation of substrates in mammals.
Point Mutation
Introducing point mutations in the catalytic residues of farnesylcysteine lyase can help identify essential amino acids for substrate binding and catalysis. Such mutants can be generated via CRISPR base editing or homology-directed repair.
Knock-in
Knock-in of epitope tags or fluorescent proteins allows visualization and immunoprecipitation of farnesylcysteine lyase. This approach is useful for studying its subcellular localization and interacting partners.
Overexpression
Overexpression of farnesylcysteine lyase in cell lines or transgenic organisms can reveal gain-of-function phenotypes, such as enhanced prenylcysteine clearance or altered signaling. This is particularly useful for complementation studies.
How EDITGENE Supports farnesylcysteine lyase activity Research
Researchers studying farnesylcysteine lyase activity-related genes often need to determine whether a candidate gene is causally involved in prenylcysteine metabolism, ABA signaling, or related diseases. EDITGENE provides comprehensive CRISPR-based services to create precise cellular and animal models for such investigations.
Contact EDITGENE today to design your custom CRISPR model for farnesylcysteine lyase activity research.
Frequently Asked Questions About farnesylcysteine lyase activity
What is farnesylcysteine lyase activity?
It is an enzymatic activity that cleaves S-farnesyl-L-cysteine into farnesal, L-cysteine, and H2O2, as defined by GO:0102149.
What genes are involved in farnesylcysteine lyase activity?
Key genes include AtFCLY in Arabidopsis and Pcly in mouse, which encode the enzyme.
What is the function of farnesylcysteine lyase in plants?
In Arabidopsis, it negatively regulates abscisic acid signaling and helps detoxify farnesylcysteine.
What happens when farnesylcysteine lyase is deficient in mice?
Mice lacking prenylcysteine lyase accumulate farnesylcysteine and geranylgeranylcysteine in brain and liver.
How is farnesylcysteine lyase activity measured?
It can be assayed by monitoring the production of farnesal or H2O2 using HPLC or fluorescence methods.
Is farnesylcysteine lyase involved in human disease?
Its role in human disease is not fully established, but it is important for prenylcysteine metabolism, which may impact cancer and neurological disorders.
What is the reaction catalyzed by farnesylcysteine lyase?
S-[(2E,6E)-farnesyl]-L-cysteine + O2 + H2O = (2-trans,6-trans)-farnesal + L-cysteine + H2O2.
Can CRISPR be used to study farnesylcysteine lyase?
Yes, CRISPR knockout, point mutation, and knock-in models are valuable for dissecting its function.
What is the relationship between farnesylcysteine lyase and farnesol dehydrogenase?
Farnesal produced by the lyase can be further metabolized by farnesol dehydrogenase, linking the two enzymes in isoprenoid metabolism.
Where is farnesylcysteine lyase located in the cell?
It is likely a soluble enzyme, but subcellular localization may vary; in plants it is involved in peroxisomal or cytosolic processes.
Conclusion
Farnesylcysteine lyase activity (GO:0102149) is a critical enzymatic function for the recycling and detoxification of prenylcysteines, with roles in plant hormone signaling and mammalian metabolism. Its study offers insights into protein prenylation dynamics and related diseases. Using CRISPR-based models, researchers can further elucidate its mechanisms and therapeutic potential.
References
- 1. Huizinga DH et al.. 2010. Farnesylcysteine lyase is involved in negative regulation of abscisic acid signaling in Arabidopsis.. Mol Plant 3(1):143-55 PMID: 19969520
- 2. Beigneux A et al.. 2002. Prenylcysteine lyase deficiency in mice results in the accumulation of farnesylcysteine and geranylgeranylcysteine in brain and liver.. J Biol Chem 277(41):38358-63 PMID: 12151402
- 3. Crowell DN et al.. 2007. Arabidopsis thaliana plants possess a specific farnesylcysteine lyase that is involved in detoxification and recycling of farnesylcysteine.. Plant J 50(5):839-47 PMID: 17425716
- 4. Bhandari J et al.. 2010. Identification of a novel abscisic acid-regulated farnesol dehydrogenase from Arabidopsis.. Plant Physiol 154(3):1116-27 PMID: 20807998
