GO:0051499 D-aminoacyl-tRNA deacylase activity: Mechanism, Genes and Research Methods
Research-grade guide for scientists and biopharma professionals
Key Takeaways
• GO:0051499 D-aminoacyl-tRNA deacylase activity is a molecular_function that hydrolyzes D-aminoacyl-tRNA to release a D-alpha-amino acid, tRNA and H+, thereby removing D-amino acids from charged tRNA.
• D-aminoacyl-tRNA deacylases (DTDs) act as chiral proofreaders that prevent D-amino acids from being incorporated into proteins during translation.
• The enzyme is conserved from bacteria to humans and includes D-Tyr-tRNA(Tyr) deacylase and related D-aminoacyl-tRNA deacylases in Escherichia coli, Saccharomyces cerevisiae, archaea, plants and mammals.
• Beyond chiral proofreading, DTD defends the cell against glycine mischarging by alanyl-tRNA synthetase (AlaRS), linking GO:0051499 to translational quality control.
• Elongation factor Tu (EF-Tu) modulates DTD activity by preventing misediting of Gly-tRNA(Gly), revealing a functional interaction between translation factors and chiral proofreading.
• D-aminoacyl-tRNA deacylase activity can be studied with CRISPR knockout, point-mutation, knock-in, overexpression models, and with Ribo-seq, RNA-seq, proteomics and biochemical deacylation assays.
Description
GO:0051499 D-aminoacyl-tRNA deacylase activity is a molecular_function that catalyzes the reaction: a D-aminoacyl-tRNA + H2O = a D-alpha-amino acid + a tRNA + H+. In other words, it removes a D-amino acid from a charged tRNA. This activity is part of the broader machinery that maintains the fidelity of protein biosynthesis, because standard ribosomal translation uses L-amino acids, and D-aminoacyl-tRNAs can otherwise interfere with or be misincorporated into proteins. The existence of dedicated D-aminoacyl-tRNA deacylases (DTDs) was established through biochemical and structural studies of D-Tyr-tRNA(Tyr) deacylase, a tRNA-dependent hydrolase that defines a distinct enzyme class. Subsequent work identified D-aminoacyl-tRNA deacylases in bacteria, yeast, archaea and plants, showing that GO:0051499 is an evolutionarily conserved activity. For researchers, GO:0051499 matters because it connects aminoacyl-tRNA synthetase editing, chiral proofreading, and cellular defense against mischarging, all of which influence translational accuracy and stress responses. The term is therefore central to studies of translation quality control, D-amino acid metabolism, and the design of experiments that test how cells cope with non-canonical amino acids.
D-aminoacyl-tRNA deacylase activity At A Glance
| GO ID | GO:0051499 |
|---|---|
| GO term | D-aminoacyl-tRNA deacylase activity |
| Ontology | molecular_function |
| Synonym | (none) |
| Definition | Catalysis of the reaction: a D-aminoacyl-tRNA + H2O = a D-alpha-amino acid + a tRNA + H+. Removal of a D-amino acid from a charged tRNA. |
| Major function | Chiral proofreading and removal of D-amino acids from charged tRNA during translation |
| Representative enzymes | D-Tyr-tRNA(Tyr) deacylase and related D-aminoacyl-tRNA deacylases (DTDs) |
| Cellular context | Cytoplasm, associated with aminoacyl-tRNA synthetase editing and translation quality control |
| Research relevance | Translational fidelity, D-amino acid metabolism, stress tolerance and synthetic biology |
What Is GO:0051499?
In my own words, GO:0051499 D-aminoacyl-tRNA deacylase activity describes the catalytic removal of a D-amino acid from a charged tRNA molecule. The reaction consumes water and releases the free D-alpha-amino acid, the uncharged tRNA and a proton. This is a hydrolytic editing activity that acts on D-aminoacyl-tRNAs rather than on L-aminoacyl-tRNAs, and it therefore serves as a chiral proofreading step during protein synthesis.
Why Is D-aminoacyl-tRNA deacylase activity Important in Cell Biology?
GO:0051499 is important because it protects the translation machinery from D-amino acids, which are not the standard substrates for ribosomal protein synthesis. Without this deacylase activity, D-aminoacyl-tRNAs can accumulate and potentially cause mistranslation or cellular toxicity. The activity also intersects with aminoacyl-tRNA synthetase editing pathways, as shown by evidence that D-amino acids can be activated and edited by synthetases. In addition, DTD provides a defense against glycine mischarging by AlaRS, expanding its role beyond simple chiral proofreading. Because D-aminoacyl-tRNA deacylases are conserved across bacteria, yeast, archaea and plants, findings in model organisms can inform understanding of human translation quality control.
• Maintains chiral fidelity of protein synthesis by removing D-amino acids from charged tRNA.
• Prevents D-aminoacyl-tRNA accumulation that could interfere with ribosomal translation.
• Acts as a cellular defense against glycine mischarging by alanyl-tRNA synthetase (AlaRS).
• Interacts functionally with elongation factor Tu (EF-Tu), which prevents misediting of Gly-tRNA(Gly).
• Is conserved from bacteria to plants and archaea, making it a model for evolutionary studies of chiral proofreading.
• Connects to aminoacyl-tRNA synthetase editing, a major source of translational errors.
• Provides a biochemical handle for studying D-amino acid metabolism in cells.
• Can be targeted by CRISPR knockout or point mutation to test its role in stress responses and translation fidelity.
• Relevant to biotechnology and synthetic biology when non-canonical amino acids are used.
• Offers a potential quality-control node for understanding diseases linked to mistranslation.
Molecular Mechanism of D-aminoacyl-tRNA deacylase activity
Substrate recognition and binding of D-aminoacyl-tRNA
In simple terms: The enzyme first grabs a tRNA that carries a D-amino acid instead of the normal L-amino acid.
D-aminoacyl-tRNA deacylases recognize the D-stereochemistry of the aminoacyl moiety on a charged tRNA. Structural work on D-Tyr-tRNA(Tyr) deacylase established that this enzyme belongs to a new class of tRNA-dependent hydrolases that bind D-aminoacyl-tRNA substrates. The enzyme must discriminate D-aminoacyl-tRNA from L-aminoacyl-tRNA, which is the basis of chiral proofreading during protein biosynthesis.
Hydrolytic cleavage of the ester bond
In simple terms: Once bound, the enzyme uses water to cut the bond between the D-amino acid and the tRNA.
The catalytic reaction follows the GO definition: a D-aminoacyl-tRNA + H2O = a D-alpha-amino acid + a tRNA + H+. This hydrolysis releases the free D-amino acid and uncharged tRNA, preventing the D-amino acid from entering the ribosome. The reaction is stereospecific, as shown by studies of D-aminoacyl-tRNA metabolism in Escherichia coli and Saccharomyces cerevisiae.
Chiral proofreading and editing by aminoacyl-tRNA synthetases
In simple terms: Some synthetases can mistakenly attach D-amino acids, and deacylases clean up these errors.
D-amino acids can be activated by aminoacyl-tRNA synthetases, and editing pathways exist to remove them. D-aminoacyl-tRNA deacylase activity provides an additional layer of chiral proofreading beyond synthetase editing, ensuring that D-aminoacyl-tRNAs do not accumulate. This proofreading is especially important because the chiral proofreading site of DTD is designed to reject L-amino acids while accepting D-amino acids.
Interaction with elongation factor Tu and the ribosome
In simple terms: A translation factor called EF-Tu can influence whether the deacylase acts on certain tRNAs.
Elongation factor Tu (EF-Tu) prevents misediting of Gly-tRNA(Gly) caused by the design of the chiral proofreading site of D-aminoacyl-tRNA deacylase. This indicates that the deacylase does not act in isolation but is integrated with the translational apparatus. The interplay between EF-Tu and DTD helps balance proofreading with the need to deliver correctly charged tRNAs to the ribosome.
Cellular defense against glycine mischarging by AlaRS
In simple terms: The deacylase also protects cells when the wrong amino acid, glycine, is attached to tRNA by AlaRS.
Beyond chiral proofreading, D-aminoacyl-tRNA deacylase functions as a cellular defense against glycine mischarging by alanyl-tRNA synthetase (AlaRS). This expands the biological role of GO:0051499 from a purely chiral filter to a broader translational quality-control activity. The finding links DTD to the same error pathways that are monitored by synthetase editing domains.
Key Genes Involved in GO:0051499 D-aminoacyl-tRNA deacylase activity
The genes and proteins below are directly associated with D-aminoacyl-tRNA deacylase activity or with the editing and translation machinery that produces its substrates.
| Gene | Major Role | Research Relevance |
|---|---|---|
| DTD1 (human D-aminoacyl-tRNA deacylase 1) | Catalyzes removal of D-amino acids from charged tRNA | Core enzyme for GO:0051499 studies in human cells |
| DTD2 (human D-aminoacyl-tRNA deacylase 2) | Related D-aminoacyl-tRNA deacylase | Potential redundancy and substrate specificity studies |
| dtd (E. coli D-aminoacyl-tRNA deacylase) | Bacterial chiral proofreading enzyme | Model for biochemical and structural assays |
| DTD1 (S. cerevisiae) | Yeast D-aminoacyl-tRNA deacylase | Genetic studies of D-aminoacyl-tRNA metabolism |
| GEK1 (Arabidopsis thaliana) | Plant D-aminoacyl-tRNA deacylase involved in ethanol tolerance | Links GO:0051499 to stress tolerance in plants |
| D-Tyr-tRNA(Tyr) deacylase (archaeal) | Archaeal representative of the enzyme class | Evolutionary and structural comparisons |
| AARS1 (AlaRS) | Alanyl-tRNA synthetase that can mischarge tRNA with glycine | Source of substrates for DTD defense |
| AARS2 (mitochondrial AlaRS) | Mitochondrial alanyl-tRNA synthetase | Potential mitochondrial quality control |
| TUFM (EF-Tu, mitochondrial) | Elongation factor that interacts with DTD proofreading | Modulates misediting of Gly-tRNA(Gly) |
| tufA (E. coli EF-Tu) | Bacterial elongation factor | Prevents misediting by DTD |
| GARS1 (GlyRS) | Glycyl-tRNA synthetase | Produces Gly-tRNA(Gly) relevant to DTD editing |
| YARS1 (TyrRS) | Tyrosyl-tRNA synthetase | Produces D-Tyr-tRNA(Tyr) substrates |
| LARS1 (LeuRS) | Leucyl-tRNA synthetase with editing domain | Comparison of editing mechanisms |
| IARS1 (IleRS) | Isoleucyl-tRNA synthetase with editing domain | Comparison of editing mechanisms |
| VARS1 (ValRS) | Valyl-tRNA synthetase with editing domain | Comparison of editing mechanisms |
| ThrRS (TARS1) | Threonyl-tRNA synthetase | Editing and D-amino acid activation studies |
| ProRS (PARS1) | Prolyl-tRNA synthetase | Editing and mistranslation studies |
| AlaX (E. coli) | tRNA-Ala species | Substrate for AlaRS mischarging and DTD defense |
How Is D-aminoacyl-tRNA deacylase activity Regulated?
D-aminoacyl-tRNA deacylase activity is regulated at multiple levels. Its substrate availability depends on aminoacyl-tRNA synthetase editing and on the presence of D-amino acids, which can be activated by synthetases. The activity is also modulated by elongation factor Tu, which prevents misediting of Gly-tRNA(Gly) by the chiral proofreading site of DTD. In addition, DTD expression and function respond to cellular stress, as shown by the role of the plant D-aminoacyl-tRNA deacylase GEK1 in ethanol tolerance. These layers of regulation ensure that chiral proofreading is balanced with the demands of translation.
D-aminoacyl-tRNA deacylase activity and Human Disease
| Gene | Disease / Biology | Potential Experimental Model |
|---|---|---|
| DTD1 | Translational fidelity and mistranslation stress | Human cell line knockout and rescue |
| AARS1 | Glycine mischarging and proteotoxic stress | Point-mutation knock-in of AlaRS editing domain |
| GEK1 | Ethanol tolerance in plants | Arabidopsis knockout and overexpression |
| TUFM | Mitochondrial translation quality control | Mitochondria-targeted knockout |
| DTD1 (yeast) | D-aminoacyl-tRNA metabolism | Yeast deletion and growth assays |
Translational fidelity and mistranslation-related disease
Defects in translational quality control can lead to mistranslation and protein aggregation, which are linked to neurodegenerative and metabolic diseases. Because GO:0051499 removes D-amino acids from charged tRNA, its dysfunction could contribute to an increased burden of D-aminoacyl-tRNAs and mistranslation. Studies of aminoacyl-tRNA synthetase editing provide evidence that D-amino acids can be activated and edited, highlighting the importance of these pathways for cellular health.
AlaRS mischarging and cellular stress
D-aminoacyl-tRNA deacylase acts as a defense against glycine mischarging by AlaRS, a pathway that can produce aberrant proteins. When this defense is compromised, cells may experience proteotoxic stress. This connection places GO:0051499 in the broader context of aminoacyl-tRNA synthetase-related stress responses.
Plant stress tolerance and agricultural relevance
The Arabidopsis thaliana D-aminoacyl-tRNA deacylase GEK1 is involved in ethanol tolerance, showing that GO:0051499 can influence stress responses beyond translation. This finding suggests that D-aminoacyl-tRNA deacylases may be relevant to crop stress biology and to understanding how plants cope with environmental challenges.
Evolutionary and mitochondrial implications
D-aminoacyl-tRNA deacylases are found in archaea, bacteria, yeast and plants, indicating deep evolutionary conservation. In eukaryotes, mitochondrial translation may also require chiral proofreading, although direct evidence for mitochondrial DTD function remains an active area of research.
From D-aminoacyl-tRNA deacylase activity-Related Genes to Experimental Models
| Research Question | Suitable Model |
|---|---|
| Does loss of DTD cause D-aminoacyl-tRNA accumulation? | CRISPR knockout of DTD1 in human cells |
| Does a catalytic point mutation abolish deacylase activity? | Point-mutation knock-in of catalytic residues |
| Can tagged DTD be used to study localization? | Knock-in of an epitope tag at the endogenous locus |
| Does DTD overexpression protect against D-amino acid stress? | Overexpression cell model |
| Does DTD interact with EF-Tu or the ribosome? | Co-immunoprecipitation and proteomics in knockout background |
| Is DTD required for plant stress tolerance? | Arabidopsis GEK1 knockout and overexpression |
How to Study the D-aminoacyl-tRNA deacylase activity Process
| Method | What It Measures | Typical Application |
|---|---|---|
| In vitro deacylation assay | Release of D-amino acid from D-aminoacyl-tRNA | Confirming enzyme activity |
| Crystal structure determination | Three-dimensional fold and active site | Mechanistic and evolutionary studies |
| Site-directed mutagenesis | Role of catalytic residues | Testing chiral proofreading residues |
| Ribo-seq | Ribosome occupancy and translation fidelity | Global effects of DTD loss |
| RNA-seq | Transcriptional changes | Stress-response gene expression |
| Co-immunoprecipitation / mass spectrometry | Protein-protein interactions | Identifying EF-Tu and synthetase partners |
| Growth assays with D-amino acids | Cellular sensitivity to D-amino acids | Phenotypic validation of DTD function |
| Fluorescence microscopy | Subcellular localization of tagged DTD | Knock-in tagged cell lines |
Biochemical deacylation assays
Direct measurement of GO:0051499 uses D-aminoacyl-tRNA substrates and monitors the release of free D-amino acids or uncharged tRNA. Such assays were used to identify D-Tyr-tRNA(Tyr) deacylase and to characterize its catalytic activity. These experiments are essential for confirming that a candidate enzyme has D-aminoacyl-tRNA deacylase activity rather than a related hydrolase activity.
Structural biology and mutagenesis
Crystal structures of D-Tyr-tRNA(Tyr) deacylase revealed a new class of tRNA-dependent hydrolases and identified key catalytic residues. Site-directed mutagenesis of these residues can test their role in catalysis and in chiral discrimination. Structural comparisons across archaea and bacteria help explain the evolutionary conservation of GO:0051499.
Ribo-seq and RNA-seq
Ribosome profiling (Ribo-seq) can detect changes in translation fidelity and codon-specific stalling when DTD is lost or overexpressed. RNA-seq complements this by measuring changes in tRNA synthetase and stress-response gene expression. Together, these methods link GO:0051499 to global translation outcomes.
Proteomics and interactomics
Affinity purification followed by mass spectrometry can identify proteins that interact with DTD, such as elongation factors or synthetases. Proteomics can also detect D-amino acid incorporation into proteins when proofreading is compromised. These approaches help place GO:0051499 within the wider translation network.
How CRISPR Can Be Used to Study GO:0051499 D-aminoacyl-tRNA deacylase activity
Knockout
CRISPR knockout of DTD1 or its orthologs can test whether GO:0051499 is required for survival in the presence of D-amino acids or for general translation fidelity. Knockout cells can be challenged with D-amino acids and monitored by growth assays and Ribo-seq.
Point Mutation
Point-mutation knock-in of catalytic residues identified in the D-Tyr-tRNA(Tyr) deacylase structure can separate deacylase activity from other functions. Such mutants are valuable for testing whether chiral proofreading is essential for cellular defense against glycine mischarging.
Knock-in
Knock-in of an epitope tag or fluorescent protein at the endogenous DTD locus allows localization and interaction studies under native expression levels. Tagged knock-in models avoid artifacts from overexpression and are useful for imaging and proteomics.
Overexpression
Overexpression of DTD or GEK1 can test whether increased deacylase activity protects cells from D-amino acid stress or ethanol stress. Overexpression models are also useful for biochemical purification of the enzyme for in vitro assays.
How EDITGENE Supports D-aminoacyl-tRNA deacylase activity Research
Researchers studying D-aminoacyl-tRNA deacylase activity-related genes often need to determine whether a candidate gene is causally involved in chiral proofreading, translation fidelity, or stress responses. EDITGENE provides CRISPR-based cell models and screening services that allow direct testing of these hypotheses in relevant cell types.
Contact EDITGENE today to design your custom CRISPR model for D-aminoacyl-tRNA deacylase activity research.
Frequently Asked Questions About D-aminoacyl-tRNA deacylase activity
What is D-aminoacyl-tRNA deacylase activity?
It is a molecular_function (GO:0051499) that catalyzes the removal of a D-amino acid from a charged tRNA, releasing the free D-amino acid, tRNA and H+.
What genes are involved in D-aminoacyl-tRNA deacylase activity?
Key genes include DTD1 and DTD2 in humans, dtd in E. coli, DTD1 in yeast, GEK1 in Arabidopsis, and archaeal D-Tyr-tRNA(Tyr) deacylase, along with synthetases such as AARS1 and translation factors like EF-Tu.
Why is D-aminoacyl-tRNA deacylase important for translation?
It prevents D-amino acids from being incorporated into proteins by removing them from charged tRNA, thereby maintaining chiral fidelity during protein synthesis.
How does D-aminoacyl-tRNA deacylase defend against glycine mischarging?
It removes D-aminoacyl-tRNAs and helps counter glycine mischarging by alanyl-tRNA synthetase (AlaRS), acting as a cellular defense beyond chiral proofreading.
What is the relationship between D-aminoacyl-tRNA deacylase and EF-Tu?
Elongation factor Tu prevents misediting of Gly-tRNA(Gly) caused by the chiral proofreading site of D-aminoacyl-tRNA deacylase, showing that the two proteins functionally interact.
Which organisms have D-aminoacyl-tRNA deacylase activity?
The activity is found in bacteria such as Escherichia coli, yeast such as Saccharomyces cerevisiae, archaea, and plants such as Arabidopsis thaliana.
How can I study D-aminoacyl-tRNA deacylase activity in the lab?
Common methods include in vitro deacylation assays, crystal structure determination, site-directed mutagenesis, Ribo-seq, RNA-seq, proteomics and CRISPR knockout or overexpression models.
What diseases are linked to D-aminoacyl-tRNA deacylase activity?
Dysfunction of translational quality control is linked to mistranslation and proteotoxic stress, and plant DTD (GEK1) is linked to ethanol tolerance; direct human disease associations remain an active research area.
Can CRISPR be used to study D-aminoacyl-tRNA deacylase activity?
Yes, CRISPR knockout, point-mutation knock-in, tagged knock-in and overexpression models can test the role of DTD genes in translation fidelity and stress responses.
What is the GO ID for D-aminoacyl-tRNA deacylase activity?
The GO ID is GO:0051499, and the ontology aspect is molecular_function.
Conclusion
GO:0051499 D-aminoacyl-tRNA deacylase activity is a conserved molecular function that removes D-amino acids from charged tRNA, protecting translation from chiral errors and contributing to cellular defense against mischarging. Its study spans biochemistry, structural biology, genetics and genomics, with model organisms from bacteria to plants providing mechanistic insights. CRISPR-based cell models and multi-omics approaches now make it feasible to dissect how this activity influences translation fidelity and stress responses in human cells.
References
- 1. Pawar KI et al.. 2017. Role of D-aminoacyl-tRNA deacylase beyond chiral proofreading as a cellular defense against glycine mischarging by AlaRS.. Elife 6 PMID: 28362257
- 2. Rybak MY et al.. 2019. Stereospecificity control in aminoacyl-tRNA-synthetases: new evidence of d-amino acids activation and editing.. Nucleic Acids Res 47(18):9777-9788 PMID: 31504788
- 3. Wydau S et al.. 2007. GEK1, a gene product of Arabidopsis thaliana involved in ethanol tolerance, is a D-aminoacyl-tRNA deacylase.. Nucleic Acids Res 35(3):930-8 PMID: 17251192
- 4. Kumar P et al.. 2022. Chiral proofreading during protein biosynthesis and its evolutionary implications.. FEBS Lett 596(13):1615-1627 PMID: 35662005
- 5. Routh SB et al.. 2016. Elongation Factor Tu Prevents Misediting of Gly-tRNA(Gly) Caused by the Design Behind the Chiral Proofreading Site of D-Aminoacyl-tRNA Deacylase.. PLoS Biol 14(5):e1002465 PMID: 27224426
- 6. Ferri-Fioni ML et al.. 2001. Structure of crystalline D-Tyr-tRNA(Tyr) deacylase. A representative of a new class of tRNA-dependent hydrolases.. J Biol Chem 276(50):47285-90 PMID: 11568181
- 7. Soutourina J et al.. 2000. Metabolism of D-aminoacyl-tRNAs in Escherichia coli and Saccharomyces cerevisiae cells.. J Biol Chem 275(42):32535-42 PMID: 10918062
- 8. Ferri-Fioni ML et al.. 2006. Identification in archaea of a novel D-Tyr-tRNATyr deacylase.. J Biol Chem 281(37):27575-85 PMID: 16844682
