GO:0050094 L-methionine:glyoxylate transaminase activity: Mechanism, Genes and Research Methods
Research-grade guide for scientists and biopharma professionals
Key Takeaways
• GO:0050094 defines the molecular function that catalyzes the reversible transamination of L-methionine and glyoxylate to 4-methylsulfanyl-2-oxobutanoate and glycine.
• This activity is a pyridoxal 5'-phosphate (PLP)-dependent aminotransferase reaction and is often measured as MGAT activity in plants, bacteria, and mammalian tissues.
• In melon fruit, a ripening-specific L-methionine aminotransferase initiates volatile C3-thioether ester biosynthesis, linking this GO term to flavor and aroma formation.
• In lactic acid bacteria such as Lactobacillus casei and Lactobacillus plantarum, methionine transamination is the first step in methionine catabolism, producing aroma compounds in fermented foods.
• Human liver kynurenine--glyoxylate aminotransferase (also known as alanine--glyoxylate aminotransferase and serine--pyruvate aminotransferase) can use glyoxylate as an amino acceptor, connecting this activity to primary hyperoxaluria type 1.
• CRISPR knockout, point-mutation, knock-in, and overexpression models are essential to test whether candidate transaminases causally contribute to methionine metabolism, volatile biosynthesis, or glyoxylate detoxification.
Description
L-methionine:glyoxylate transaminase activity (GO:0050094) is a molecular function that catalyzes the reversible transfer of an amino group from L-methionine to glyoxylate, yielding 4-methylsulfanyl-2-oxobutanoate and glycine. This reaction belongs to the large family of pyridoxal 5'-phosphate (PLP)-dependent aminotransferases, which are central to amino acid metabolism in all domains of life. The term is particularly important because it connects methionine catabolism to glyoxylate detoxification and to the production of volatile sulfur-containing flavor compounds in plants and microorganisms. Researchers study GO:0050094 to understand how methionine is partitioned between protein synthesis, transmethylation, and catabolic pathways that generate α-keto acids and sulfur volatiles. In plants, a ripening-specific L-methionine aminotransferase was functionally characterized in melon and shown to initiate the biosynthesis of C3-thioether esters, which are key aroma volatiles. In bacteria, transamination is the first step of methionine catabolism in Lactobacillus casei and Lactobacillus plantarum, contributing to cheese and fermented food aroma. In mammals, glyoxylate-utilizing aminotransferases such as alanine--glyoxylate aminotransferase and kynurenine--glyoxylate aminotransferase are clinically relevant because glyoxylate accumulation causes primary hyperoxaluria type 1. Because the reaction is reversible and uses a common cofactor, L-methionine:glyoxylate transaminase activity can be difficult to distinguish from related aminotransferase activities in crude lysates. Careful biochemical assays, genetic models, and modern CRISPR-based editing are therefore needed to assign this activity to specific gene products and to determine its physiological roles.
L-methionine:glyoxylate transaminase activity At A Glance
| GO ID | GO:0050094 |
|---|---|
| GO term | L-methionine:glyoxylate transaminase activity |
| Ontology | molecular_function |
| Synonym | L-methionine:glyoxylate aminotransferase activity; methionine-glyoxylate aminotransferase activity; methionine-glyoxylate transaminase activity; MGAT activity |
| Definition | Catalysis of the reaction: glyoxylate + L-methionine = 4-methylsulfanyl-2-oxobutanoate + glycine |
| Reaction direction | Reversible transamination |
| Cofactor | Pyridoxal 5'-phosphate (PLP) dependent aminotransferase |
| Major function | Methionine catabolism and glyoxylate detoxification; production of α-keto-γ-methylthiobutyrate and glycine |
| Related activities | Alanine--glyoxylate aminotransferase, serine--pyruvate aminotransferase, kynurenine--glyoxylate aminotransferase, glutamine transaminase |
What Is GO:0050094?
GO:0050094, L-methionine:glyoxylate transaminase activity, is defined as catalysis of the reaction: glyoxylate + L-methionine = 4-methylsulfanyl-2-oxobutanoate + glycine. In other words, the enzyme transfers the amino group of L-methionine to glyoxylate, converting L-methionine into its α-keto acid analog (4-methylsulfanyl-2-oxobutanoate, also known as α-keto-γ-methylthiobutyrate) and converting glyoxylate into glycine. This is a PLP-dependent transamination reaction, and the activity is synonymous with L-methionine:glyoxylate aminotransferase, methionine-glyoxylate aminotransferase, methionine-glyoxylate transaminase, and MGAT activity.
Why Is L-methionine:glyoxylate transaminase activity Important in Cell Biology?
L-methionine:glyoxylate transaminase activity is important because it sits at the intersection of sulfur amino acid metabolism and glyoxylate detoxification, two pathways with broad physiological and biotechnological relevance. In plants, this activity initiates the biosynthesis of volatile C3-thioether esters that define fruit aroma, making it a target for flavor improvement. In bacteria, it is the first step of methionine catabolism in lactic acid bacteria, influencing the aroma of fermented dairy and other foods. In mammals, glyoxylate-utilizing aminotransferases prevent glyoxylate accumulation, and deficiencies in these enzymes cause primary hyperoxaluria type 1, a severe kidney disease. Because the reaction is reversible and shares substrates with other aminotransferases, precise genetic models are needed to dissect its specific contributions.
• Provides a route for methionine catabolism that generates α-keto-γ-methylthiobutyrate, a precursor of volatile sulfur compounds.
• Contributes to glyoxylate detoxification by converting glyoxylate to glycine, protecting against oxalate overproduction.
• Supports fruit aroma formation, as shown for a ripening-specific L-methionine aminotransferase in melon.
• Drives aroma development in fermented foods through methionine transamination in Lactobacillus species.
• Is clinically linked to primary hyperoxaluria type 1 through glyoxylate-utilizing aminotransferases such as alanine--glyoxylate aminotransferase.
• Shares substrates and cofactors with other PLP-dependent aminotransferases, complicating functional assignment.
• Represents a potential target for metabolic engineering of sulfur volatile production in crops and microbes.
• Can be studied with CRISPR knockout and knock-in models to separate it from related aminotransferase activities.
• Is relevant to nitrogen assimilation research in phototrophic bacteria such as Rhodopseudomonas acidophila.
• Provides a biochemical marker for methionine catabolism in both eukaryotic and prokaryotic systems.
What Happens During L-methionine:glyoxylate transaminase activity?
Substrate binding and Schiff base formation
In simple terms: The enzyme first grabs L-methionine and holds it using a helper molecule called PLP.
In the first stage of the reaction, the PLP cofactor forms a Schiff base with the ε-amino group of a conserved lysine residue in the active site. L-methionine then displaces the lysine and forms an external aldimine with PLP, positioning the amino group for transfer. This step is characteristic of all PLP-dependent aminotransferases, including those that use glyoxylate as an amino acceptor.
Amino group transfer to glyoxylate
In simple terms: The amino group from methionine is handed over to glyoxylate, turning glyoxylate into glycine.
After formation of the methionine-PLP external aldimine, the amino group is transferred to the cofactor, generating pyridoxamine 5'-phosphate (PMP) and releasing 4-methylsulfanyl-2-oxobutanoate. Glyoxylate then binds and accepts the amino group from PMP, producing glycine and regenerating the PLP cofactor. This ping-pong bi-bi mechanism is typical of aminotransferases that use glyoxylate as a substrate.
Release of products and catalytic cycle
In simple terms: The enzyme lets go of the new products and is ready to start again.
The products, glycine and 4-methylsulfanyl-2-oxobutanoate, are released from the active site, and the enzyme returns to its resting PLP-bound state. The reaction is reversible, so the same enzyme can also catalyze the reverse transamination from glycine and 4-methylsulfanyl-2-oxobutanoate back to L-methionine and glyoxylate. In vivo, the direction depends on substrate availability and the metabolic context, such as methionine catabolism in bacteria or volatile biosynthesis in ripening fruit.
Physiological context in plants and microorganisms
In simple terms: In living organisms, this reaction helps make smells and break down methionine.
In melon fruit, a ripening-specific L-methionine aminotransferase catalyzes this reaction as the first step in the biosynthesis of volatile C3-thioether esters, which contribute to fruit aroma. In Lactobacillus casei and Lactobacillus plantarum, methionine transamination initiates methionine catabolism, leading to the production of volatile sulfur compounds in fermented foods. In phototrophic bacteria such as Rhodopseudomonas acidophila, related transamination reactions participate in nitrogen assimilation.
Relationship to glyoxylate detoxification
In simple terms: The same kind of reaction helps the body get rid of a harmful substance called glyoxylate.
Glyoxylate is a toxic metabolite that can be converted to oxalate, which causes kidney stones and tissue damage in primary hyperoxaluria type 1. Human liver kynurenine--glyoxylate aminotransferase, which is identical to alanine--glyoxylate aminotransferase and serine--pyruvate aminotransferase, can use glyoxylate as an amino acceptor and convert it to glycine. This detoxification function links glyoxylate-utilizing transaminases, including L-methionine:glyoxylate transaminase activity, to oxalate homeostasis and kidney health.
Key Genes Involved in GO:0050094 L-methionine:glyoxylate transaminase activity
The following genes and proteins are experimentally linked to L-methionine:glyoxylate transaminase activity or to closely related glyoxylate-utilizing aminotransferase reactions.
| Gene | Major Role | Research Relevance |
|---|---|---|
| Melon L-methionine aminotransferase (ripening-specific) | Catalyzes L-methionine:glyoxylate transamination during fruit ripening | Functional characterization of volatile C3-thioether ester biosynthesis |
| Lactobacillus casei methionine transaminase | Initiates methionine catabolism by transamination | Aroma formation in fermented dairy products |
| Lactobacillus plantarum methionine transaminase | Initiates methionine catabolism by transamination | Aroma formation in fermented plant products |
| Rat liver asparagine transaminase | Transaminase with broad amino acceptor specificity | Model enzyme for aminotransferase kinetics and substrate specificity |
| Human liver kynurenine--glyoxylate aminotransferase | Uses glyoxylate as amino acceptor; identical to alanine--glyoxylate aminotransferase | Primary hyperoxaluria type 1 and glyoxylate detoxification |
| Rhodopseudomonas acidophila transaminases | Nitrogen assimilation via transamination | Bacterial nitrogen metabolism |
| Rat liver glutamate-glyoxylate aminotransferase | Glyoxylate transamination in cytosol | Identity with alanine-2-oxoglutarate aminotransferase |
| Rat kidney glutamine transaminase | Broad specificity transaminase using glyoxylate | Model for ω-amidase and transaminase coupling |
| Alanine--glyoxylate aminotransferase (AGXT) | Detoxifies glyoxylate by transamination | Primary hyperoxaluria type 1 |
| Serine--pyruvate aminotransferase | Overlapping activity with alanine--glyoxylate aminotransferase | Glyoxylate metabolism and hyperoxaluria |
| Kynurenine aminotransferase | Transaminates kynurenine and glyoxylate | Tryptophan metabolism and neurobiology |
| Asparagine transaminase | Transaminates asparagine and glyoxylate | Amino acid catabolism |
| Glutamine transaminase | Transaminates glutamine and glyoxylate | Nitrogen metabolism and ammonia handling |
| Glutamate-glyoxylate aminotransferase | Transaminates glutamate and glyoxylate | Cytosolic glyoxylate metabolism |
| Methionine aminotransferase (plant) | Ripening-specific methionine catabolism | Volatile sulfur compound biosynthesis |
| Methionine transaminase (bacterial) | First step of methionine catabolism | Fermented food aroma |
How Is L-methionine:glyoxylate transaminase activity Regulated?
L-methionine:glyoxylate transaminase activity is regulated at multiple levels. In melon fruit, the ripening-specific L-methionine aminotransferase is developmentally regulated, with expression increasing during ripening to support volatile C3-thioether ester biosynthesis. In lactic acid bacteria, methionine transamination is influenced by the availability of methionine and α-keto acids in the growth medium, which affects aroma production in fermented foods. In mammals, glyoxylate-utilizing aminotransferases such as alanine--glyoxylate aminotransferase are regulated by peroxisomal targeting, substrate availability, and cofactor (PLP) status; deficiencies in these enzymes cause primary hyperoxaluria type 1. Because the reaction is reversible and shares substrates with other aminotransferases, its flux is also controlled by the relative concentrations of L-methionine, glyoxylate, glycine, and 4-methylsulfanyl-2-oxobutanoate.
L-methionine:glyoxylate transaminase activity and Human Disease
| Gene | Disease / Biology | Potential Experimental Model |
|---|---|---|
| AGXT (alanine--glyoxylate aminotransferase) | Primary hyperoxaluria type 1; glyoxylate detoxification | HepG2 or HEK293T knockout and knock-in of patient mutations |
| Kynurenine--glyoxylate aminotransferase | Glyoxylate metabolism; tryptophan catabolism | Liver cell lines with CRISPR knockout and overexpression |
| Melon L-methionine aminotransferase | Fruit aroma volatile biosynthesis | Melon fruit transient knockout or stable overexpression |
| Lactobacillus methionine transaminase | Fermented food aroma; methionine catabolism | Bacterial knockout and complementation in Lactobacillus |
| Glutamine transaminase | Nitrogen metabolism; ammonia handling | Rat kidney or liver cell models with CRISPR knockout |
Primary hyperoxaluria type 1 and glyoxylate detoxification
Primary hyperoxaluria type 1 is caused by deficiency of alanine--glyoxylate aminotransferase, a peroxisomal enzyme that converts glyoxylate to glycine. Human liver kynurenine--glyoxylate aminotransferase, which is identical to alanine--glyoxylate aminotransferase and serine--pyruvate aminotransferase, can also use glyoxylate as an amino acceptor. When glyoxylate detoxification is impaired, glyoxylate is converted to oxalate, leading to calcium oxalate kidney stones and systemic oxalosis. L-methionine:glyoxylate transaminase activity represents an additional route for glyoxylate utilization, and its contribution to oxalate homeostasis is an active area of research.
Methionine metabolism and sulfur amino acid disorders
Methionine is an essential sulfur amino acid, and its catabolism via transamination produces α-keto-γ-methylthiobutyrate, a precursor of volatile sulfur compounds and a source of sulfur for other pathways. In bacteria, methionine transamination is the first step of catabolism in Lactobacillus casei and Lactobacillus plantarum, influencing the aroma of fermented foods. In plants, a ripening-specific L-methionine aminotransferase drives volatile C3-thioether ester biosynthesis in melon fruit. Disruption of methionine catabolism can affect sulfur amino acid balance, but direct human disease associations for L-methionine:glyoxylate transaminase activity itself remain to be fully defined.
Aminotransferase-related metabolic conditions
Aminotransferases are central to amino acid metabolism, and their dysfunction can contribute to metabolic disorders. Rat liver asparagine transaminase and rat kidney glutamine transaminase are model enzymes for studying aminotransferase kinetics and substrate specificity, which inform understanding of related human enzymes. Rat liver glutamate-glyoxylate aminotransferase is identical to alanine-2-oxoglutarate aminotransferase, illustrating how a single protein can harbor multiple transaminase activities relevant to disease. These studies provide a framework for interpreting the clinical significance of glyoxylate-utilizing transaminases, including L-methionine:glyoxylate transaminase activity.
From L-methionine:glyoxylate transaminase activity-Related Genes to Experimental Models
| Research Question | Suitable Model |
|---|---|
| Does the candidate gene encode L-methionine:glyoxylate transaminase activity? | CRISPR knockout in a cell line followed by biochemical assay with L-methionine and glyoxylate |
| Which active-site residues are required for catalysis? | Point mutation of predicted catalytic lysine or substrate-binding residues followed by kinetic analysis |
| Can a disease-associated mutation alter glyoxylate detoxification? | Knock-in of patient mutations into AGXT or related genes in hepatocyte-like cells |
| Where is the enzyme localized in the cell? | Tagged knock-in with fluorescent protein and live-cell imaging |
| Does overexpression increase volatile sulfur compound production? | Overexpression of plant or bacterial methionine aminotransferase in fruit or microbial hosts |
| Is the activity regulated during development or ripening? | Time-course expression and activity assays in ripening fruit or differentiating cells |
How to Study the L-methionine:glyoxylate transaminase activity Process
| Method | What It Measures | Typical Application |
|---|---|---|
| Biochemical transaminase assay | Formation of glycine or 4-methylsulfanyl-2-oxobutanoate | Confirming L-methionine:glyoxylate transaminase activity in lysates or purified enzyme |
| CRISPR knockout | Loss of enzyme activity and downstream metabolites | Assigning activity to a specific gene |
| Point mutation | Effect of active-site residues on catalysis | Mechanistic studies of PLP-dependent transaminases |
| Knock-in | Effect of disease-associated mutations | Modeling primary hyperoxaluria type 1 in cells |
| Overexpression | Gain of activity and metabolite flux | Engineering volatile sulfur compound production |
| RNA-seq | Transcript levels of candidate genes | Identifying ripening- or growth-stage-specific expression |
| Metabolomics | Glyoxylate, glycine, oxalate, and volatile compounds | Assessing detoxification and aroma pathways |
| Live-cell imaging | Subcellular localization of tagged enzyme | Determining peroxisomal or cytosolic localization |
Biochemical activity assays
L-methionine:glyoxylate transaminase activity is typically measured by incubating protein lysates or purified enzyme with L-methionine and glyoxylate, then detecting the products glycine and 4-methylsulfanyl-2-oxobutanoate. Because the reaction is reversible and shares substrates with other aminotransferases, assays must include appropriate controls and, where possible, purified recombinant enzyme. Coupled assays using glutamate dehydrogenase or lactate dehydrogenase can monitor α-keto acid production.
Genetic and CRISPR-based perturbation
CRISPR knockout, point mutation, knock-in, and overexpression models allow researchers to assign L-methionine:glyoxylate transaminase activity to specific genes and to test causality. For example, knocking out a candidate methionine aminotransferase in melon or Lactobacillus can reveal its contribution to volatile biosynthesis or methionine catabolism. In mammalian cells, knock-in of patient mutations into AGXT or related genes can model primary hyperoxaluria type 1.
Expression and omics profiling
RNA-seq, proteomics, and metabolomics can reveal when and where L-methionine:glyoxylate transaminase activity is expressed and how it affects metabolic flux. In melon fruit, ripening-specific expression of a methionine aminotransferase correlates with volatile C3-thioether ester production. In bacteria, transcriptomic and metabolomic analyses of Lactobacillus species can link methionine transamination to aroma compound formation. In mammalian systems, metabolomics can quantify glyoxylate, glycine, and oxalate to assess detoxification capacity.
Structural and mechanistic studies
X-ray crystallography, site-directed mutagenesis, and kinetic isotope effects can define the catalytic mechanism of PLP-dependent transaminases, including those that use glyoxylate as an amino acceptor. Crystallization of human liver kynurenine--glyoxylate aminotransferase provided early structural and mechanistic insights into glyoxylate-utilizing enzymes. Similar approaches can be applied to L-methionine:glyoxylate transaminases once candidate genes are identified.
How CRISPR Can Be Used to Study GO:0050094 L-methionine:glyoxylate transaminase activity
Knockout
CRISPR knockout of candidate L-methionine:glyoxylate transaminase genes is the most direct way to test whether a specific gene product is responsible for the activity. In melon, knockout of the ripening-specific L-methionine aminotransferase would be expected to reduce volatile C3-thioether ester production. In Lactobacillus, knockout of methionine transaminase genes can reveal their role in methionine catabolism and aroma formation. In mammalian cells, knockout of glyoxylate-utilizing aminotransferases can increase glyoxylate and oxalate levels, modeling primary hyperoxaluria type 1.
Point Mutation
Point mutation of predicted catalytic residues, such as the PLP-binding lysine or substrate-binding residues, can dissect the mechanism of L-methionine:glyoxylate transaminase activity. Site-directed mutagenesis of related aminotransferases has been used to define substrate specificity and catalytic efficiency. In patient-derived cells, point mutations that mimic disease alleles can test whether specific residues are required for glyoxylate detoxification.
Knock-in
Knock-in of tagged or mutant versions of the gene allows precise tracking of localization, stability, and function. For example, knocking in a fluorescent tag into the endogenous locus of a glyoxylate-utilizing aminotransferase can reveal peroxisomal targeting and dynamics. Knock-in of disease-associated mutations into AGXT or related genes can model primary hyperoxaluria type 1 and test therapeutic strategies.
Overexpression
Overexpression of L-methionine:glyoxylate transaminase genes can increase flux through methionine catabolism and volatile sulfur compound production. In melon fruit, overexpression of the ripening-specific L-methionine aminotransferase may enhance C3-thioether ester biosynthesis. In Lactobacillus, overexpression of methionine transaminase can increase aroma compound formation in fermented foods. In mammalian cells, overexpression of glyoxylate-utilizing aminotransferases can reduce glyoxylate and oxalate levels, suggesting a potential therapeutic approach.
How EDITGENE Supports L-methionine:glyoxylate transaminase activity Research
Researchers studying L-methionine:glyoxylate transaminase activity-related genes often need to determine whether a candidate gene is causally involved in methionine catabolism, volatile biosynthesis, or glyoxylate detoxification. Because the reaction is reversible and shares substrates with other aminotransferases, biochemical assays alone are often insufficient to assign activity to a specific gene product. CRISPR-based genetic models provide the necessary causal evidence by removing, modifying, or adding the candidate gene in a controlled cellular context.
Contact EDITGENE today to design your custom CRISPR model for L-methionine:glyoxylate transaminase activity research.
Frequently Asked Questions About L-methionine:glyoxylate transaminase activity
What is L-methionine:glyoxylate transaminase activity?
It is a molecular function defined by GO:0050094 that catalyzes the reversible transfer of an amino group from L-methionine to glyoxylate, producing 4-methylsulfanyl-2-oxobutanoate and glycine.
What is the GO ID for L-methionine:glyoxylate transaminase activity?
The GO ID is GO:0050094, under the molecular_function ontology.
What reaction does GO:0050094 catalyze?
It catalyzes glyoxylate + L-methionine = 4-methylsulfanyl-2-oxobutanoate + glycine, a PLP-dependent transamination reaction.
What genes are involved in L-methionine:glyoxylate transaminase activity?
Genes include ripening-specific L-methionine aminotransferases in melon, methionine transaminases in Lactobacillus casei and Lactobacillus plantarum, and glyoxylate-utilizing aminotransferases such as human alanine--glyoxylate aminotransferase and kynurenine--glyoxylate aminotransferase.
Is L-methionine:glyoxylate transaminase activity related to primary hyperoxaluria?
Yes, glyoxylate-utilizing aminotransferases such as alanine--glyoxylate aminotransferase are deficient in primary hyperoxaluria type 1, and related activities can contribute to glyoxylate detoxification.
How is L-methionine:glyoxylate transaminase activity measured?
It is typically measured by incubating enzyme with L-methionine and glyoxylate and detecting glycine or 4-methylsulfanyl-2-oxobutanoate, often with coupled assays or mass spectrometry.
What cofactor does L-methionine:glyoxylate transaminase require?
Like other aminotransferases, it requires pyridoxal 5'-phosphate (PLP) as a cofactor.
Can CRISPR be used to study L-methionine:glyoxylate transaminase activity?
Yes, CRISPR knockout, point mutation, knock-in, and overexpression models can assign activity to specific genes and test causality in metabolic pathways.
Why is L-methionine:glyoxylate transaminase activity important in plants?
In melon, a ripening-specific L-methionine aminotransferase initiates the biosynthesis of volatile C3-thioether esters, which contribute to fruit aroma.
Why is L-methionine:glyoxylate transaminase activity important in bacteria?
In Lactobacillus casei and Lactobacillus plantarum, methionine transamination is the first step of methionine catabolism and contributes to aroma formation in fermented foods.
Conclusion
L-methionine:glyoxylate transaminase activity (GO:0050094) is a PLP-dependent transamination reaction that links methionine catabolism to glyoxylate detoxification and to the production of volatile sulfur compounds. Its roles in fruit aroma, fermented food flavor, and human glyoxylate metabolism make it relevant to plant science, microbiology, and medicine. Because the activity overlaps with other aminotransferases, CRISPR-based genetic models are essential to assign function to specific genes and to test causality. Researchers can use knockout, point mutation, knock-in, overexpression, and library screening approaches to dissect the regulation and physiological impact of L-methionine:glyoxylate transaminase activity. Such studies may inform metabolic engineering of aroma compounds, improve understanding of primary hyperoxaluria type 1, and reveal new connections between sulfur amino acid metabolism and cellular detoxification.
References
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