GO:0102521 tRNA-4-demethylwyosine synthase activity: Mechanism, Genes and Research Methods
Research-grade guide for scientists and biopharma professionals
Key Takeaways
• GO:0102521 describes the catalytic activity that converts N1-methylguanine37 in tRNAPhe into 4-demethylwyosine37 using pyruvate and S-adenosyl-L-methionine.
• The reaction produces L-methionine, 5'-deoxyadenosine, carbon dioxide, and water as byproducts.
• This activity is essential for the biosynthesis of wybutosine, a hypermodified guanosine derivative found at position 37 of tRNAPhe.
• Loss of this activity impairs translational fidelity and has been linked to mitochondrial dysfunction and neurological disease.
• The enzyme belongs to the radical SAM superfamily and requires an iron-sulfur cluster for catalysis.
• Researchers study this activity using knockout cell models, ribosome profiling, and mass spectrometry-based tRNA modification analysis.
Description
GO:0102521, tRNA-4-demethylwyosine synthase activity, is a molecular function that catalyzes a key step in the biosynthesis of wybutosine, a complex modification found at position 37 of phenylalanine tRNA (tRNAPhe). This activity is responsible for converting N1-methylguanine37 into 4-demethylwyosine37 through a reaction that consumes pyruvate and S-adenosyl-L-methionine (SAM) and releases L-methionine, 5'-deoxyadenosine, carbon dioxide, and water. The enzyme performing this reaction is a member of the radical SAM superfamily, which utilizes a [4Fe-4S] cluster to generate a 5'-deoxyadenosyl radical for hydrogen atom abstraction. Understanding this activity is crucial because wybutosine and its derivatives are critical for maintaining the reading frame during translation and preventing ribosomal frameshifting at phenylalanine codons. Defects in this pathway have been associated with mitochondrial dysfunction and severe neurological disorders, making it a target of interest for both basic and translational research.
tRNA-4-demethylwyosine synthase activity At A Glance
| GO ID | GO:0102521 |
|---|---|
| GO term | tRNA-4-demethylwyosine synthase activity |
| Ontology | molecular_function |
| Synonym | None |
| Major function | Catalyzes the formation of 4-demethylwyosine37 in tRNAPhe |
| Substrates | Pyruvate, S-adenosyl-L-methionine, N1-methylguanine37 in tRNAPhe |
| Products | L-methionine, 5'-deoxyadenosine, carbon dioxide, H2O, 4-demethylwyosine37 in tRNAPhe |
| Cofactor | Iron-sulfur cluster (radical SAM enzyme) |
| Pathway | Wybutosine biosynthesis |
What Is GO:0102521?
According to the Gene Ontology, GO:0102521 is defined as the catalysis of the reaction: pyruvate + S-adenosyl-L-methionine + N1-methylguanine37 in tRNAPhe = L-methionine + 5'-deoxyadenosine + carbon dioxide + H2O + 4-demethylwyosine37 in tRNAPhe. In simpler terms, it is the enzyme activity that adds a specific chemical group to a modified guanine base in tRNA, using pyruvate and SAM as substrates, to produce an intermediate in the wybutosine modification pathway.
Why Is tRNA-4-demethylwyosine synthase activity Important in Cell Biology?
This activity is critical for the proper maturation of tRNAPhe and the fidelity of protein synthesis. The wybutosine modification at position 37 stabilizes the codon-anticodon interaction and prevents frameshifting, which is essential for accurate translation of phenylalanine-rich proteins. Mutations in the enzyme responsible for this activity have been linked to mitochondrial dysfunction and neurological disorders, highlighting its importance in human health.
• Ensures accurate translation of phenylalanine codons by preventing ribosomal frameshifting.
• Required for the biosynthesis of wybutosine, a hypermodified tRNA nucleoside.
• Dysfunction leads to mitochondrial translation defects and oxidative stress.
• Associated with rare neurological diseases such as intellectual disability and encephalopathy.
• Serves as a model for radical SAM enzyme chemistry.
• Potential target for antibiotics and anticancer drugs.
• Involved in cellular stress responses and metabolic regulation.
• Provides insights into tRNA modification and epitranscriptomics.
What Happens During tRNA-4-demethylwyosine synthase activity?
Substrate Recognition and Binding
In simple terms: The enzyme finds and grabs the tRNA molecule that needs modification.
The enzyme specifically recognizes N1-methylguanine37 within the anticodon loop of tRNAPhe. This recognition involves structural features of the tRNA, including the anticodon stem and loop, ensuring that only the correct substrate is modified.
Radical SAM Activation
In simple terms: The enzyme uses a special iron-sulfur cluster to generate a reactive radical.
The enzyme belongs to the radical SAM superfamily and contains a [4Fe-4S] cluster that binds S-adenosyl-L-methionine (SAM). Reductive cleavage of SAM produces a 5'-deoxyadenosyl radical, which abstracts a hydrogen atom from the substrate to initiate catalysis.
Pyruvate Incorporation and Decarboxylation
In simple terms: A pyruvate molecule is added and then broken down, releasing carbon dioxide.
Pyruvate is used as a co-substrate and is likely converted into an acetyl group that is incorporated into the final product, with concomitant release of carbon dioxide and water. This step is essential for the formation of the 4-demethylwyosine ring.
Product Formation and Release
In simple terms: The modified tRNA is released, along with several byproducts.
The reaction yields 4-demethylwyosine37 in tRNAPhe, along with L-methionine, 5'-deoxyadenosine, carbon dioxide, and water. The modified tRNA is then further processed by downstream enzymes to form wybutosine.
Key Genes Involved in GO:0102521 tRNA-4-demethylwyosine synthase activity
The following genes and proteins are directly involved in or regulate the tRNA-4-demethylwyosine synthase activity and the wybutosine biosynthesis pathway.
| Gene | Major Role | Research Relevance |
|---|---|---|
| TYW1 | Catalyzes the 4-demethylwyosine synthase reaction | Mutations linked to neurological disorders |
| TYW2 | Methyltransferase in wybutosine biosynthesis | Required for subsequent modification steps |
| TYW3 | Methyltransferase in wybutosine biosynthesis | Required for subsequent modification steps |
| TYW4 | Hydroxylase/ methyltransferase in wybutosine biosynthesis | Required for final wybutosine formation |
| TRM12 | Methylates N1 of guanine37 in tRNAPhe | Generates the substrate for TYW1 |
| SAM | Cofactor providing methyl group and radical | Essential for radical SAM chemistry |
| tRNAPhe | Substrate tRNA | Contains the modified guanine37 |
| Fe-S cluster assembly proteins | Provide iron-sulfur cluster for TYW1 | Required for enzyme activity |
| Mitochondrial translation factors | Facilitate tRNAPhe function | Affected by modification defects |
| Elongation factor Tu | Binds aminoacyl-tRNA | Interacts with modified tRNAPhe |
| Ribosome | Decodes mRNA | Fidelity depends on wybutosine |
| tRNA modification enzymes | General tRNA maturation | Cross-talk with wybutosine pathway |
| RNA polymerase III | Transcribes tRNA genes | Provides tRNAPhe precursor |
| tRNA processing enzymes | Cleave and trim tRNA | Generate mature tRNAPhe |
| Aminoacyl-tRNA synthetase (PheRS) | Charges tRNAPhe with phenylalanine | Requires modified tRNA for optimal function |
| Mitochondrial RNA import factors | Import tRNA into mitochondria | Affect mitochondrial translation |
| Stress response kinases | Regulate translation under stress | Modulate tRNA modification effects |
How Is tRNA-4-demethylwyosine synthase activity Regulated?
The activity of tRNA-4-demethylwyosine synthase is regulated at multiple levels, including transcriptional control of the TYW1 gene, availability of substrates (pyruvate, SAM, and tRNAPhe), and the assembly of the iron-sulfur cluster. Additionally, cellular stress conditions such as oxidative stress can affect the stability and activity of radical SAM enzymes. The pathway is also coordinated with other tRNA modification steps to ensure proper tRNA maturation.
tRNA-4-demethylwyosine synthase activity and Human Disease
| Gene | Disease / Biology | Potential Experimental Model |
|---|---|---|
| TYW1 | Neurological disorder with mitochondrial dysfunction | Knockout iPSC-derived neurons |
| TYW1 | Cancer (e.g., hepatocellular carcinoma) | Xenograft mouse models |
| TYW2 | Intellectual disability | Patient-derived fibroblasts |
| TYW3 | Developmental delay | CRISPR knock-in mouse models |
| TRM12 | Mitochondrial myopathy | Skeletal muscle-specific knockout mice |
Neurological Disorders
Defects in tRNA-4-demethylwyosine synthase activity lead to impaired wybutosine modification, which has been associated with severe neurological phenotypes including intellectual disability, developmental delay, and encephalopathy. These conditions often arise from mitochondrial dysfunction due to impaired translation of mitochondrial-encoded proteins.
Mitochondrial Dysfunction
Loss of wybutosine modification destabilizes tRNAPhe and impairs mitochondrial translation, leading to reduced oxidative phosphorylation and increased reactive oxygen species production. This can contribute to a range of metabolic and degenerative diseases.
Cancer
Altered tRNA modification patterns, including changes in wybutosine levels, have been observed in various cancers. The dysregulation of tRNA-4-demethylwyosine synthase activity may affect translational reprogramming that supports tumor growth and survival.
From tRNA-4-demethylwyosine synthase activity-Related Genes to Experimental Models
| Research Question | Suitable Model |
|---|---|
| What is the catalytic mechanism of TYW1? | Recombinant TYW1 with site-directed mutagenesis |
| How does loss of TYW1 affect translation? | TYW1 knockout cell lines and ribosome profiling |
| What are the downstream effects on mitochondrial function? | TYW1 knockout iPSC-derived neurons |
| Can wybutosine modification be restored? | Knock-in of wild-type TYW1 in patient cells |
| How is TYW1 regulated under stress? | Overexpression and reporter assays |
| What proteins interact with TYW1? | Tagged knock-in and affinity purification |
How to Study the tRNA-4-demethylwyosine synthase activity Process
| Method | What It Measures | Typical Application |
|---|---|---|
| Ribo-seq | Translation efficiency and frameshifting | Global effects of tRNA modification |
| LC-MS/MS | tRNA modification levels | Quantification of 4-demethylwyosine |
| CRISPR-Cas9 KO | Gene function | Loss-of-function studies |
| Site-directed mutagenesis | Enzyme activity | Mechanistic studies |
| Western blot | Protein expression | Validation of knockout/overexpression |
| Immunofluorescence | Subcellular localization | Imaging of TYW1 |
| RNA-seq | Transcriptome changes | Downstream effects |
| Co-immunoprecipitation | Protein interactions | Identification of complex components |
Ribosome Profiling
Ribosome profiling (Ribo-seq) allows researchers to monitor translation efficiency and frameshifting at phenylalanine codons in cells with altered tRNA-4-demethylwyosine synthase activity. This method provides a global view of how the modification affects protein synthesis.
Mass Spectrometry of tRNA Modifications
Liquid chromatography-tandem mass spectrometry (LC-MS/MS) can quantify the levels of 4-demethylwyosine and wybutosine in purified tRNA samples, directly assessing enzyme activity.
CRISPR-Cas9 Genome Editing
Knockout, point mutation, and knock-in models generated by CRISPR-Cas9 enable precise interrogation of TYW1 function and its role in disease.
Fluorescence Imaging
Tagged TYW1 with fluorescent proteins allows visualization of its subcellular localization and dynamics in live cells.
How CRISPR Can Be Used to Study GO:0102521 tRNA-4-demethylwyosine synthase activity
Knockout
CRISPR-Cas9 knockout of TYW1 eliminates tRNA-4-demethylwyosine synthase activity, allowing researchers to study the consequences of wybutosine deficiency on translation and cellular physiology.
Point Mutation
Introducing specific point mutations in TYW1 via CRISPR can dissect the catalytic residues required for radical SAM chemistry and substrate binding.
Knock-in
Knock-in of tagged or mutant TYW1 alleles enables precise tracking of the enzyme and rescue experiments in patient-derived cells.
Overexpression
CRISPR activation or cDNA overexpression of TYW1 can increase enzyme levels to study gain-of-function effects and pathway saturation.
How EDITGENE Supports tRNA-4-demethylwyosine synthase activity Research
Researchers studying tRNA-4-demethylwyosine synthase activity-related genes often need to determine whether a candidate gene is causally involved in tRNA modification, translation fidelity, or disease. EDITGENE provides a comprehensive suite of CRISPR-based services to accelerate this research.
Contact EDITGENE today to design your custom CRISPR model for tRNA-4-demethylwyosine synthase activity research.
Frequently Asked Questions About tRNA-4-demethylwyosine synthase activity
What is tRNA-4-demethylwyosine synthase activity?
It is the enzyme activity that catalyzes the formation of 4-demethylwyosine37 in tRNAPhe, a step in wybutosine biosynthesis.
What genes are involved in tRNA-4-demethylwyosine synthase activity?
The primary gene is TYW1, along with other wybutosine biosynthesis genes such as TYW2, TYW3, TYW4, and TRM12.
What is the GO ID for tRNA-4-demethylwyosine synthase activity?
GO:0102521.
What reaction does tRNA-4-demethylwyosine synthase catalyze?
It converts pyruvate, SAM, and N1-methylguanine37 in tRNAPhe into L-methionine, 5'-deoxyadenosine, CO2, H2O, and 4-demethylwyosine37.
Why is tRNA-4-demethylwyosine synthase activity important?
It ensures accurate translation by preventing frameshifting at phenylalanine codons and is linked to mitochondrial function and neurological health.
What diseases are associated with defects in this activity?
Neurological disorders, mitochondrial dysfunction, and certain cancers.
How can I study tRNA-4-demethylwyosine synthase activity?
Using CRISPR knockout models, Ribo-seq, mass spectrometry, and biochemical assays.
What are the substrates of tRNA-4-demethylwyosine synthase?
Pyruvate, S-adenosyl-L-methionine, and N1-methylguanine37 in tRNAPhe.
What cofactors are required?
An iron-sulfur cluster and S-adenosyl-L-methionine.
Can EDITGENE help create models for this pathway?
Yes, EDITGENE offers knockout, point mutation, knock-in, overexpression, and screening services.
Conclusion
GO:0102521, tRNA-4-demethylwyosine synthase activity, is a critical enzymatic function in tRNA modification and translational fidelity. Its role in wybutosine biosynthesis and association with human diseases make it a compelling target for research. By leveraging advanced CRISPR models and analytical methods, scientists can further unravel its mechanisms and therapeutic potential.
References
- 1. Sun S et al.. 2025. Exercise-induced histone lactylation in monocyte-derived macrophages restores cardiac immune homeostasis and function in sepsis-induced cardiomyopathy.. Nat Commun 17(1):756 PMID: 41398160
