GO:0016755 aminoacyltransferase activity: Mechanism, Genes and Research Methods
Research-grade guide for scientists and biopharma professionals
Key Takeaways
• GO:0016755 aminoacyltransferase activity describes enzymes that transfer an amino-acyl group from a donor compound to an acceptor molecule.
• This activity is central to protein synthesis, post-translational arginylation, bacterial cell wall cross-linking, and protein ligation reactions.
• Key human genes include ATE1, which mediates arginyl-tRNA-protein transfer, and TUG, which undergoes insulin-stimulated endoproteolytic cleavage.
• Bacterial aminoacyltransferases such as MprF and MurM are validated drug targets and determinants of resistance to daptomycin and penicillin.
• Directed evolution using yeast display has generated bond-forming enzymes with altered aminoacyltransferase specificity, enabling new bioconjugation tools.
• CRISPR knockout, point-mutation, knock-in, and overexpression models are essential for dissecting the causal roles of aminoacyltransferase genes in disease.
Description
Aminoacyltransferase activity (GO:0016755) is a molecular function defined as the catalysis of the transfer of an amino-acyl group from one compound (donor) to another (acceptor). This activity is fundamental to diverse biological processes, including protein synthesis, post-translational modification, bacterial cell wall biosynthesis, and protein engineering. Enzymes with this activity are found across all domains of life and participate in both housekeeping and specialized functions. For researchers, understanding aminoacyltransferase activity is critical because dysregulation or mutation of these enzymes is linked to metabolic disorders, antibiotic resistance, and cancer. Moreover, the ability to reprogram aminoacyltransferases has enabled the development of novel bond-forming enzymes for bioconjugation and therapeutic applications. This article provides a comprehensive overview of the mechanism, key genes, disease relevance, and research methods for studying aminoacyltransferase activity, with a focus on CRISPR-based models and EDITGENE services.
aminoacyltransferase activity At A Glance
| GO ID | GO:0016755 |
|---|---|
| GO term | aminoacyltransferase activity |
| Ontology | molecular_function |
| Synonym | transferase activity, transferring amino-acyl groups |
| Definition | Catalysis of the transfer of an amino-acyl group from one compound (donor) to another (acceptor). |
| Major function | Transfer of amino-acyl groups in protein synthesis, post-translational modification, and cell wall biosynthesis. |
| EC number | 2.3.2.- |
| Related terms | aminoacyl-tRNA ligase activity, peptidyl transferase activity, arginyltransferase activity. |
What Is GO:0016755?
Aminoacyltransferase activity (GO:0016755) is the catalysis of the transfer of an amino-acyl group from a donor molecule to an acceptor molecule. This definition encompasses enzymes that use aminoacyl-tRNA, aminoacyl-CoA, or other aminoacyl donors to modify proteins, lipids, or cell wall components. The activity is classified under transferases, specifically those transferring amino-acyl groups. Synonyms include transferase activity, transferring amino-acyl groups. This GO term captures a broad range of enzymes, from ribosomal peptidyl transferases to arginyltransferases and bacterial aminoacyltransferases involved in cell wall cross-linking.
Why Is aminoacyltransferase activity Important in Cell Biology?
Aminoacyltransferase activity is essential for fundamental cellular processes such as protein synthesis, where peptidyl transferase forms peptide bonds, and for post-translational modifications like arginylation that regulate protein stability and function. In bacteria, aminoacyltransferases such as MprF and MurM are critical for cell wall integrity and resistance to antibiotics like daptomycin and penicillin. In humans, the TUG protein undergoes insulin-stimulated endoproteolytic cleavage, a process linked to glucose uptake and energy expenditure, highlighting the role of aminoacyltransferase-like activities in metabolic regulation. Furthermore, engineered aminoacyltransferases have become powerful tools for site-specific protein labeling and bioconjugation. Thus, studying this activity has broad implications for basic biology, drug discovery, and biotechnology.
• Central to protein synthesis as peptidyl transferase activity in the ribosome.
• Mediates post-translational arginylation via ATE1, affecting protein degradation and cytoskeletal dynamics.
• Bacterial aminoacyltransferases like MprF confer resistance to daptomycin, a last-resort antibiotic.
• MurM-mediated cell wall cross-linking influences penicillin resistance in Streptococcus pneumoniae.
• TUG cleavage, an aminoacyltransferase-like event, links insulin signaling to glucose uptake.
• Engineered aminoacyltransferases enable site-specific protein labeling and bond formation.
• Sortase A, a transpeptidase with aminoacyltransferase activity, is used for protein ligation.
• Dysregulation of arginylation is implicated in neurodegeneration and cancer.
• Aminoacyltransferase activity is a target for antimicrobial and anticancer drug development.
• Assays for ATE1 and arginylation provide tools for high-throughput screening.
What Happens During aminoacyltransferase activity?
Aminoacyl donor activation and binding
In simple terms: The enzyme grabs an amino acid that is attached to a carrier molecule, getting it ready to be transferred.
The first step in aminoacyltransferase activity involves the binding of an aminoacyl donor, such as aminoacyl-tRNA or aminoacyl-CoA, to the enzyme's active site. For arginyltransferases like ATE1, the donor is arginyl-tRNA, which is recognized by the enzyme through specific interactions. In bacterial systems, MprF utilizes aminoacyl-tRNA to modify phosphatidylglycerol, a key step in daptomycin resistance. The binding is often stabilized by conserved residues that coordinate the aminoacyl moiety and the carrier molecule.
Acceptor recognition and orientation
In simple terms: The enzyme finds the target molecule and positions it correctly so the amino acid can be attached.
The acceptor molecule varies widely depending on the enzyme. For ATE1, the acceptor is the N-terminus of a protein, typically after removal of the initiator methionine. In cell wall biosynthesis, MurM transfers aminoacyl groups to a peptidoglycan precursor, forming cross-links that strengthen the bacterial cell wall. The enzyme ensures specificity by recognizing structural features of the acceptor, such as the N-terminal residue or the peptidoglycan stem peptide.
Catalysis and product release
In simple terms: The amino acid is transferred to the target, and the finished product is released.
The catalytic step involves the nucleophilic attack of the acceptor on the aminoacyl donor, forming a new amide or ester bond. This reaction is often facilitated by general acid-base catalysis. For example, sortase A catalyzes a transpeptidation reaction that ligates proteins with an aminoacyl group. After bond formation, the product is released, and the enzyme is ready for another cycle. In the case of TUG cleavage, the endoproteolytic event releases a fragment that translocates to the nucleus to regulate gene expression.
Post-catalytic regulation and recycling
In simple terms: After the reaction, the enzyme can be turned on or off, and it may be reused.
Aminoacyltransferase activity is tightly regulated. For instance, ATE1 activity can be modulated by cellular stress and arginine availability. In bacteria, MprF expression is induced in response to daptomycin exposure, leading to increased aminoacyltransferase activity and resistance. The enzyme may undergo conformational changes or post-translational modifications that affect its recycling and activity. Understanding these regulatory mechanisms is crucial for targeting these enzymes therapeutically.
Key Genes Involved in GO:0016755 aminoacyltransferase activity
The following genes encode proteins with aminoacyltransferase activity or are directly involved in aminoacyl transfer reactions, as supported by published literature.
| Gene | Major Role | Research Relevance |
|---|---|---|
| ATE1 | Arginyl-tRNA-protein transferase; mediates post-translational arginylation | Studied for roles in protein degradation, cytoskeleton, and neurodegeneration |
| TUG (ASAP1) | Golgi protein that undergoes insulin-stimulated endoproteolytic cleavage | Links insulin signaling to glucose uptake and energy expenditure |
| MprF | Lysylphosphatidylglycerol synthase; transfers lysine to phosphatidylglycerol | Confers daptomycin resistance in Staphylococcus aureus |
| MurM | Aminoacyltransferase involved in peptidoglycan cross-linking | Determines penicillin resistance in Streptococcus pneumoniae |
| Sortase A | Transpeptidase that ligates proteins with an aminoacyl group | Used for protein engineering and bioconjugation |
| MurN | Aminoacyltransferase in cell wall biosynthesis | Potential target for novel antibiotics |
| FemX | Aminoacyltransferase that adds glycine to peptidoglycan | Involved in methicillin resistance in Staphylococcus aureus |
| FemA | Aminoacyltransferase in Staphylococcus aureus | Required for beta-lactam resistance |
| FemB | Aminoacyltransferase in Staphylococcus aureus | Required for beta-lactam resistance |
| Pbp2a | Penicillin-binding protein with transpeptidase activity | Mediates resistance to beta-lactams |
| Arg-tRNA synthetase | Charges tRNA with arginine for use by ATE1 | Essential for arginylation |
| Lys-tRNA synthetase | Charges tRNA with lysine for MprF | Provides substrate for MprF |
| EF-P | Elongation factor P; interacts with aminoacyltransferases | Involved in translation and stress response |
| MurT | Aminoacyltransferase in cell wall synthesis | Potential antibiotic target |
| GatD | Glutaminyltransferase in cell wall | Related to aminoacyl transfer |
| Lgt | Prolipoprotein diacylglyceryl transferase | Not directly aminoacyltransferase but related |
| LspA | Lipoprotein signal peptidase | Not directly aminoacyltransferase but related |
How Is aminoacyltransferase activity Regulated?
Aminoacyltransferase activity is regulated at multiple levels. ATE1 activity is modulated by cellular stress, arginine availability, and post-translational modifications. Insulin stimulates TUG cleavage, which is mediated by an endoprotease that may have aminoacyltransferase-like activity, linking nutrient status to glucose uptake. In bacteria, MprF expression is induced by daptomycin, and MurM activity is regulated by the availability of peptidoglycan precursors. Additionally, engineered aminoacyltransferases can be evolved for altered substrate specificity using yeast display.
aminoacyltransferase activity and Human Disease
| Gene | Disease / Biology | Potential Experimental Model |
|---|---|---|
| ATE1 | Neurodegeneration, cancer | Ate1 knockout mouse; neuronal cell lines with ATE1 KO |
| TUG (ASAP1) | Insulin resistance, type 2 diabetes | TUG knockout adipocytes; insulin-stimulated glucose uptake assays |
| MprF | Daptomycin resistance | MprF knockout Staphylococcus aureus; daptomycin susceptibility testing |
| MurM | Penicillin resistance | MurM mutant Streptococcus pneumoniae; penicillin MIC assays |
| Sortase A | Bacterial virulence, protein engineering | Sortase A knockout Staphylococcus aureus; ligation assays |
Metabolic disorders and insulin resistance
TUG cleavage is stimulated by insulin and is required for glucose uptake in adipocytes and muscle cells. Dysregulation of this process may contribute to insulin resistance and type 2 diabetes. The aminoacyltransferase-like activity that mediates TUG cleavage is thus a potential therapeutic target for metabolic diseases.
Antibiotic resistance
MprF-mediated aminoacyltransferase activity is a major mechanism of daptomycin resistance in Staphylococcus aureus, and MurM-mediated cross-linking contributes to penicillin resistance in Streptococcus pneumoniae. Inhibiting these enzymes could restore antibiotic efficacy.
Neurodegeneration
Arginylation by ATE1 regulates protein stability and degradation. Dysregulation of arginylation has been implicated in neurodegenerative diseases such as Alzheimer's and Parkinson's, where protein aggregation is a hallmark. Modulating ATE1 activity may offer therapeutic strategies.
Cancer
Altered arginylation and aminoacyltransferase activity have been observed in various cancers, affecting cell proliferation and migration. Targeting these enzymes could provide novel anticancer approaches.
From aminoacyltransferase activity-Related Genes to Experimental Models
| Research Question | Suitable Model |
|---|---|
| Does ATE1 mediate arginylation of a specific target? | ATE1 knockout cell line (e.g., HEK293) with arginylation reporter |
| Does TUG cleavage require a specific protease? | TUG knock-in with cleavage site mutation; insulin stimulation |
| Does MprF mutation affect daptomycin resistance? | MprF point mutant in S. aureus; MIC assays |
| Does MurM overexpression increase penicillin resistance? | MurM overexpression in S. pneumoniae; penicillin susceptibility |
| Can sortase A be engineered for new substrates? | Yeast display evolution of sortase A variants |
| Does arginylation regulate protein stability? | ATE1 KO with proteasome inhibitors; pulse-chase assays |
How to Study the aminoacyltransferase activity Process
| Method | What It Measures | Typical Application |
|---|---|---|
| In vitro aminoacyltransferase assay | Enzyme kinetics and substrate specificity | Characterizing ATE1 or MprF activity |
| Yeast display | Enrichment of enzyme variants with desired activity | Directed evolution of sortase A |
| CRISPR knockout screen | Genes required for resistance or activity | Identifying MprF as daptomycin resistance gene |
| Mass spectrometry | Arginylated protein identification | Mapping ATE1 substrates |
| Fluorescent reporter assay | Intracellular arginylation levels | Monitoring ATE1 activity in live cells |
| MIC assays | Antibiotic susceptibility | Testing MprF or MurM mutants |
| Protein ligation assay | Sortase A catalytic efficiency | Engineering sortase A for bioconjugation |
| Ribo-seq | Translation efficiency of aminoacyltransferase genes | Studying regulation under stress |
In vitro activity assays
Recombinant ATE1 or MprF can be assayed using radiolabeled aminoacyl-tRNA or fluorescent substrates. For ATE1, a fluorescent reporter system has been developed to monitor intracellular arginylation. These assays are essential for kinetic characterization and inhibitor screening.
Yeast display for directed evolution
Yeast display enables the evolution of bond-forming enzymes with altered aminoacyltransferase activity. This method has been used to generate sortase A variants with improved ligation efficiency. It allows high-throughput screening of large libraries for novel substrate specificity.
CRISPR-based genetic screens
Genome-wide CRISPR knockout screens can identify genes required for aminoacyltransferase activity or resistance to antibiotics. For example, screening for daptomycin resistance genes identified MprF. These screens are powerful for discovering new components of the pathway.
Proteomics and arginylation detection
Mass spectrometry-based proteomics can identify arginylated proteins by detecting the addition of arginine to protein N-termini. This approach has revealed hundreds of potential ATE1 substrates. Combining with CRISPR knockout validates specific targets.
How CRISPR Can Be Used to Study GO:0016755 aminoacyltransferase activity
Knockout
CRISPR knockout of ATE1, MprF, or MurM can abolish aminoacyltransferase activity, leading to defects in arginylation, daptomycin resistance, or cell wall integrity, respectively. Knockout models are essential for loss-of-function studies.
Point Mutation
Point mutations in the catalytic domain of aminoacyltransferases can dissect specific residues required for activity. For example, mutating the catalytic cysteine of sortase A abolishes ligation. Such models help distinguish catalytic activity from scaffolding functions.
Knock-in
Knock-in of tagged or mutant versions of aminoacyltransferases allows tracking of protein localization and dynamics. A fluorescent knock-in of ATE1 can reveal its subcellular distribution. Knock-in of cleavage-resistant TUG can test the importance of specific cleavage sites.
Overexpression
Overexpression of MprF or MurM can confer increased antibiotic resistance, validating their role in resistance mechanisms. Overexpression of engineered sortase A variants enables efficient protein labeling.
How EDITGENE Supports aminoacyltransferase activity Research
Researchers studying aminoacyltransferase activity-related genes often need to determine whether a candidate gene is causally involved in a specific biological process or disease. This requires precise genetic manipulation, which can be achieved through CRISPR-based knockout, point mutation, knock-in, or overexpression models. EDITGENE provides comprehensive services to generate such models, enabling rigorous functional studies.
Contact EDITGENE today to design your custom CRISPR model for aminoacyltransferase activity research.
Frequently Asked Questions About aminoacyltransferase activity
What is aminoacyltransferase activity?
Aminoacyltransferase activity (GO:0016755) is the catalysis of the transfer of an amino-acyl group from a donor compound to an acceptor molecule, as defined by QuickGO.
What genes are involved in aminoacyltransferase activity?
Key genes include ATE1, TUG (ASAP1), MprF, MurM, and sortase A, which mediate arginylation, insulin-stimulated cleavage, antibiotic resistance, and protein ligation.
How is aminoacyltransferase activity regulated?
It is regulated by cellular stress, nutrient availability, and post-translational modifications; for example, insulin stimulates TUG cleavage, and daptomycin induces MprF expression.
What diseases are associated with aminoacyltransferase activity?
Dysregulation is linked to insulin resistance, antibiotic resistance, neurodegeneration, and cancer.
What methods are used to study aminoacyltransferase activity?
Common methods include in vitro activity assays, yeast display, CRISPR screens, mass spectrometry, and fluorescent reporters.
Can CRISPR be used to study aminoacyltransferase genes?
Yes, CRISPR knockout, point mutation, knock-in, and overexpression models are widely used to dissect gene function.
What is the role of ATE1 in arginylation?
ATE1 is the primary arginyltransferase that transfers arginine to protein N-termini, regulating protein stability and degradation.
How does MprF contribute to daptomycin resistance?
MprF transfers lysine to phosphatidylglycerol, altering the cell membrane charge and reducing daptomycin binding.
What is the function of MurM in bacteria?
MurM is an aminoacyltransferase that cross-links peptidoglycan precursors, affecting cell wall integrity and penicillin resistance.
What services does EDITGENE offer for aminoacyltransferase research?
EDITGENE provides CRISPR knockout, point mutation, knock-in, overexpression cell models, library screening, and bioinformatics services.
Conclusion
Aminoacyltransferase activity (GO:0016755) is a fundamental molecular function with broad biological and clinical significance. From protein synthesis and post-translational arginylation to bacterial cell wall biosynthesis and antibiotic resistance, these enzymes play critical roles in health and disease. The availability of CRISPR-based models and advanced screening technologies has accelerated our understanding of their mechanisms and therapeutic potential. EDITGENE's comprehensive services empower researchers to generate precise genetic models and uncover new insights into aminoacyltransferase biology.
References
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- 3. Chen I et al.. 2011. A general strategy for the evolution of bond-forming enzymes using yeast display.. Proc Natl Acad Sci U S A 108(28):11399-404 PMID: 21697512
- 4. Wang J et al.. 2023. Assaying ATE1 Activity In Vitro.. Methods Mol Biol 2620:113-117 PMID: 37010756
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- 7. Gjennestad RS et al.. 2025. The effect of MurM and a branched cell wall structure on penicillin resistance in Streptococcus pneumoniae.. J Bacteriol 207(11):e0014125 PMID: 41059998
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