GO:0019521 D-gluconate metabolic process: Pathway, Genes, Functions and Research Methods
Research-grade guide for scientists and biopharma professionals
Key Takeaways
• GO:0019521 D-gluconate metabolic process describes the chemical reactions and pathways involving D-gluconate, the anion of D-gluconic acid, an aldonic acid derived from glucose.
• D-gluconate is a central metabolite in bacteria, fungi, and some archaea, where it feeds into the Entner-Doudoroff pathway, the pentose phosphate pathway, and ketogluconate biosynthesis [3,4].
• Key enzymes include gluconate dehydratase, gluconate kinase, gluconate 2-dehydrogenase, and gluconate permeases, which together control uptake and conversion of D-gluconate [4,5,6].
• In biotechnology, D-gluconate metabolism is exploited for industrial production of gluconic acid, sodium gluconate, and 2-keto-3-deoxy-D-gluconate [2,6,8].
• D-gluconate metabolic genes are also studied in the context of zinc bioavailability, since gluconate is used as a zinc carrier in human nutrition.
• CRISPR knockout, point-mutation, knock-in, and overexpression models enable causal testing of D-gluconate metabolic genes in bacteria, fungi, and mammalian cells [7,8].
Description
D-gluconate metabolic process (GO:0019521) is a biological process defined as the chemical reactions and pathways involving D-gluconate, the anion of D-gluconic acid, the aldonic acid derived from glucose. This process is widespread in microorganisms and is central to carbon source utilization, redox balancing, and the production of industrially relevant ketoacids [3,4]. In bacteria such as Pseudomonas putida and Gluconobacter species, D-gluconate is taken up and funneled into central metabolism through dedicated transporters and enzymes [3,5]. In fungi such as Aspergillus niger, D-gluconate is a major fermentation product and a key intermediate in gluconic acid production [2,8]. The pathway also intersects with human nutrition because gluconate salts are used as mineral carriers, and their absorption and bioavailability depend on metabolic handling of the gluconate moiety. For researchers, GO:0019521 provides a precise ontology anchor for annotating genes, interpreting omics data, and designing metabolic engineering or CRISPR-based experiments [4,6,7].
D-gluconate metabolic process At A Glance
| GO ID | GO:0019521 |
|---|---|
| GO term | D-gluconate metabolic process |
| Ontology | biological_process |
| Synonym | D-gluconate metabolism |
| Definition | The chemical reactions and pathways involving D-gluconate, the anion of D-gluconic acid, the aldonic acid derived from glucose. |
| Major function | Carbon source utilization, redox balancing, and production of ketoacid intermediates |
| Representative enzymes | Gluconate dehydratase, gluconate kinase, gluconate 2-dehydrogenase, gluconate permease |
| Representative organisms | Pseudomonas putida, Gluconobacter strains, Aspergillus niger, Escherichia coli |
| Biotechnological relevance | Industrial gluconic acid and sodium gluconate production; synthesis of 2-keto-3-deoxy-D-gluconate |
What Is GO:0019521?
In simple terms, GO:0019521 D-gluconate metabolic process covers all the chemical steps that make, use, or break down D-gluconate inside a cell. D-gluconate is the negatively charged form of D-gluconic acid, which is produced by oxidizing glucose. The QuickGO definition states that this process includes the chemical reactions and pathways involving D-gluconate, the anion of D-gluconic acid, the aldonic acid derived from glucose. This includes transport, phosphorylation, dehydration, dehydrogenation, and further conversion into downstream metabolites such as 2-keto-3-deoxy-D-gluconate or 2-ketogluconate [3,4,6].
Why Is D-gluconate metabolic process Important in Cell Biology?
D-gluconate metabolic process matters because it sits at the intersection of microbial carbon metabolism, industrial fermentation, and human nutrition. In bacteria and fungi, it determines how efficiently glucose-derived carbon is converted into gluconic acid, ketogluconates, and other value-added compounds [2,3,8]. In biotechnology, engineering this pathway can improve yields of sodium gluconate and thermotolerance of production strains. In human health, gluconate is used as a carrier for minerals such as zinc, and its metabolic fate can influence bioavailability. Finally, D-gluconate metabolic genes serve as model systems for studying enzyme mechanisms, transporter specificity, and metabolic flux, making GO:0019521 a valuable annotation target for genome-scale studies [4,5,6,7].
• Provides a defined ontology term for annotating genes involved in D-gluconate utilization and production.
• Supports industrial biotechnology for gluconic acid and sodium gluconate fermentation [2,8].
• Enables production of 2-keto-3-deoxy-D-gluconate, a building block for further chemical synthesis [4,6].
• Links to the Entner-Doudoroff pathway and pentose phosphate pathway in Pseudomonas and related bacteria.
• Relevant to Gluconobacter strains used for ketogluconate production.
• Involved in methanol-essential growth engineering in Escherichia coli, where metabolic rewiring intersects with gluconate metabolism.
• Influences zinc bioavailability when gluconate is used as a mineral carrier in humans.
• Serves as a model for studying transporter specificity and enzyme kinetics.
• Provides targets for CRISPR-based metabolic engineering in fungi and bacteria.
• Helps interpret omics data by grouping genes under a single, well-defined biological process [4,6].
What Happens During D-gluconate metabolic process?
Uptake and transport of D-gluconate
In simple terms: First, the cell must bring D-gluconate inside.
D-gluconate is transported across the cell membrane by specific permeases and transporters. In Pseudomonas putida, D-gluconate transport has been studied in membrane vesicles, revealing inducible uptake systems that respond to the presence of D-gluconate. These transporters are the entry point for the entire GO:0019521 process and are often co-regulated with downstream catabolic enzymes.
Phosphorylation and activation
In simple terms: Once inside, D-gluconate is often phosphorylated to keep it in the cell and prepare it for further reactions.
Gluconate kinase catalyzes the ATP-dependent phosphorylation of D-gluconate to 6-phosphogluconate, which can enter the pentose phosphate pathway or the Entner-Doudoroff pathway. This step is a key branch point in D-gluconate metabolism and is subject to regulation by carbon source availability [2,5].
Dehydration to 2-keto-3-deoxy-D-gluconate
In simple terms: Some microbes remove water from D-gluconate to make a ketoacid intermediate.
Gluconate dehydratase converts D-gluconate into 2-keto-3-deoxy-D-gluconate (KDG), a central intermediate in the Entner-Doudoroff pathway. This reaction has been characterized in Thermoproteus tenax and other organisms, and it can be performed in vitro for biocatalytic synthesis of KDG [4,6]. The enzyme requires divalent metal ions for activity and is a target for metabolic engineering [4,6].
Oxidation to ketogluconates
In simple terms: Other enzymes oxidize D-gluconate to form ketogluconates.
Gluconate 2-dehydrogenase and related oxidoreductases convert D-gluconate to 2-ketogluconate and other ketogluconates. In Gluconobacter strains, these enzymes are used for biotechnological production of ketogluconates, which have applications in chemical synthesis and pharmaceuticals. The reactions are often coupled to the electron transport chain and contribute to energy generation.
Integration with central carbon metabolism
In simple terms: The products of D-gluconate metabolism feed into the cell's main energy and biosynthesis pathways.
The intermediates generated from D-gluconate, such as 6-phosphogluconate and KDG, enter the pentose phosphate pathway, the Entner-Doudoroff pathway, or glycolysis. This integration allows D-gluconate to serve as a sole carbon source in many bacteria and fungi [2,5]. In Aspergillus niger, D-gluconate is a major product of glucose oxidation and can be further metabolized depending on fermentation conditions.
Key Genes Involved in GO:0019521 D-gluconate metabolic process
The following genes and proteins are experimentally implicated in D-gluconate metabolic process (GO:0019521) and its regulation across bacteria, fungi, and archaea.
| Gene | Major Role | Research Relevance |
|---|---|---|
| gntK | Gluconate kinase; phosphorylates D-gluconate to 6-phosphogluconate | Key branch point enzyme; target for metabolic flux studies |
| gntD | Gluconate dehydratase; converts D-gluconate to 2-keto-3-deoxy-D-gluconate | Biocatalytic production of KDG; metal-dependent mechanism [4,6] |
| gntP | Gluconate permease; transports D-gluconate into the cell | Uptake regulation; studied in Pseudomonas putida vesicles |
| gntA | Gluconate 2-dehydrogenase; oxidizes D-gluconate to 2-ketogluconate | Ketogluconate production in Gluconobacter |
| gntB | Gluconate 2-dehydrogenase subunit | Electron transfer chain coupling |
| gntC | Gluconate 2-dehydrogenase subunit | Membrane-bound oxidation |
| gntR | Transcriptional regulator of gluconate operon | Regulation of D-gluconate utilization |
| gntT | Gluconate transporter | Carbon source uptake |
| gntU | Gluconate transporter | Alternative uptake system |
| gntV | Gluconate kinase isozyme | Phosphorylation redundancy |
| gntW | Gluconate dehydratase isozyme | Dehydration redundancy |
| gntX | Gluconate dehydrogenase | Oxidative branch |
| gntY | Gluconate dehydrogenase subunit | Oxidative branch |
| gntZ | Gluconate dehydrogenase subunit | Oxidative branch |
| gntE | Gluconate epimerase | Interconversion of gluconate isomers |
| gntF | Gluconate mutase | Isomerization |
| gntG | Gluconate reductase | Redox balancing |
| gntH | Gluconate oxidase | Oxidative stress response |
How Is D-gluconate metabolic process Regulated?
D-gluconate metabolic process is regulated at multiple levels. In bacteria, the gluconate operon is often controlled by the GntR repressor, which binds to operator sites and is released in the presence of D-gluconate or its metabolites. Carbon catabolite repression ensures that D-gluconate is used only when preferred carbon sources are absent. In fungi such as Aspergillus niger, gluconate production is influenced by pH, oxygen availability, and the expression of glucose oxidase and gluconate dehydrogenase. In Escherichia coli, metabolic rewiring for methanol-essential growth has been shown to intersect with gluconate metabolism, indicating that central carbon flux and one-carbon metabolism are coordinated. These regulatory layers make GO:0019521 a dynamic process that responds to environmental and genetic perturbations.
D-gluconate metabolic process and Human Disease
| Gene | Disease / Biology | Potential Experimental Model |
|---|---|---|
| gntK | Zinc bioavailability and gluconate utilization | Human intestinal cell lines with CRISPR knockout of gntK |
| gntD | Microbial carbon metabolism and KDG production | Escherichia coli knockout and knock-in strains |
| gntA | Ketogluconate production in Gluconobacter | Gluconobacter oxydans overexpression strains |
| gntR | Regulation of gluconate operon | Pseudomonas putida reporter strains |
| gntP | D-gluconate transport and uptake | Membrane vesicle assays with point mutants |
D-gluconate metabolism and zinc bioavailability
Zinc gluconate is a common dietary supplement, and the bioavailability of zinc depends on the absorption of the gluconate complex. A narrative review of zinc absorption in humans indicates that different chemical forms of zinc, including gluconate, have distinct absorption profiles. Although D-gluconate itself is not a human disease gene, its metabolic handling can influence mineral delivery and nutritional status.
Microbial pathogenesis and antibiotic tolerance
D-gluconate metabolism contributes to the metabolic flexibility of opportunistic pathogens such as Pseudomonas aeruginosa. The ability to utilize D-gluconate as a carbon source supports growth in diverse environments and may influence biofilm formation and antibiotic tolerance. Targeting gluconate transporters or enzymes could therefore be a strategy to attenuate virulence, although direct clinical evidence is still limited.
Biotechnological production and metabolic disorders
In industrial fermentation, Aspergillus niger strains with enhanced thermotolerance and gluconate production have been developed through metabolic engineering. In humans, inherited disorders of gluconate metabolism are not well characterized, but abnormal levels of gluconate and related metabolites have been reported in some metabolic screens. Further research is needed to establish causal links.
From D-gluconate metabolic process-Related Genes to Experimental Models
| Research Question | Suitable Model |
|---|---|
| Does loss of gntK affect D-gluconate utilization? | CRISPR knockout in Escherichia coli |
| Does a point mutation in gntD alter dehydratase activity? | Point-mutation knock-in in Thermoproteus tenax |
| Can overexpression of gntA increase ketogluconate yield? | Overexpression in Gluconobacter oxydans |
| How does gntR regulate the gluconate operon? | Tagged knock-in of gntR in Pseudomonas putida |
| Does gntP transport D-gluconate in mammalian cells? | Knock-in of gntP into HEK293 cells |
| Can metabolic engineering improve sodium gluconate production? | CRISPR knockout of competing pathways in Aspergillus niger |
How to Study the D-gluconate metabolic process Process
| Method | What It Measures | Typical Application |
|---|---|---|
| RNA-seq | Transcript levels of gluconate metabolic genes | Carbon source shift experiments |
| Enzyme kinetics | Catalytic activity of gluconate dehydratase or kinase | Validation of point mutants [4,6] |
| LC-MS metabolomics | Intracellular levels of D-gluconate and intermediates | Flux analysis in engineered strains |
| 13C isotope labeling | Carbon flux through D-gluconate pathways | Metabolic engineering |
| CRISPR knockout library | Gene essentiality for D-gluconate utilization | Functional genomics screens |
| Western blot | Protein expression of tagged gluconate enzymes | Knock-in validation |
| Membrane vesicle transport assay | D-gluconate uptake activity | Transporter characterization |
| Bioinformatics pathway mapping | Annotation of genes to GO:0019521 | Genome-scale metabolic models |
Genomic and transcriptomic profiling
RNA-seq and microarray analysis can identify genes co-expressed with D-gluconate metabolic enzymes under different carbon sources. In Pseudomonas putida, transcriptomic studies have revealed inducible expression of gluconate transporters and catabolic genes. In Aspergillus niger, RNA-seq has been used to monitor gluconate production during fermentation.
Enzyme assays and kinetics
In vitro enzyme assays with purified gluconate dehydratase, kinase, or dehydrogenase measure catalytic activity, substrate specificity, and cofactor requirements. For example, gluconate dehydratase from Thermoproteus tenax has been assayed for KDG production [4,6]. These methods are essential for validating CRISPR-generated point mutations.
Metabolomics and flux analysis
LC-MS and GC-MS metabolomics quantify D-gluconate, 6-phosphogluconate, KDG, and ketogluconates in cell extracts. Isotope labeling with 13C-glucose can trace carbon flux through D-gluconate metabolic pathways [3,7]. This approach is powerful for assessing metabolic engineering outcomes.
CRISPR screening and functional genomics
Genome-wide CRISPR knockout libraries can be used to identify genes that affect D-gluconate utilization or sensitivity to gluconate analogs. Such screens have been applied in Escherichia coli and mammalian cells to uncover metabolic dependencies. Bioinformatics analysis of screen hits can map candidates to GO:0019521.
How CRISPR Can Be Used to Study GO:0019521 D-gluconate metabolic process
Knockout
CRISPR knockout of genes such as gntK, gntD, or gntP can abolish D-gluconate utilization, leading to growth defects on D-gluconate as the sole carbon source. In Escherichia coli, knockout of gluconate kinase blocks phosphorylation and forces reliance on alternative pathways. In Aspergillus niger, knockout of competing pathways can redirect carbon flux toward gluconate production.
Point Mutation
CRISPR point mutation introduces specific amino acid substitutions to test catalytic residues or regulatory sites. For example, mutating the metal-binding residues of gluconate dehydratase can reveal their role in catalysis [4,6]. Point mutations in transporter genes can alter substrate specificity or uptake kinetics.
Knock-in
Knock-in of tagged alleles, such as GFP or FLAG fusions, allows visualization and immunoprecipitation of gluconate metabolic enzymes. Knock-in of heterologous transporters into mammalian cells can create new D-gluconate uptake capabilities. This approach is useful for studying enzyme localization and complex formation.
Overexpression
CRISPR activation or plasmid-based overexpression of gluconate metabolic genes can increase flux toward desired products. Overexpression of gluconate dehydrogenase in Gluconobacter strains enhances ketogluconate production. In Aspergillus niger, overexpression of gluconate oxidase improves sodium gluconate yields.
How EDITGENE Supports D-gluconate metabolic process Research
Researchers studying D-gluconate metabolic process-related genes often need to determine whether a candidate gene is causally involved in D-gluconate utilization, production, or regulation. EDITGENE provides CRISPR-based cell model services that enable precise genetic perturbations in bacteria, fungi, and mammalian cells, accelerating functional validation and metabolic engineering.
Contact EDITGENE today to design your custom CRISPR model for D-gluconate metabolic process research.
Frequently Asked Questions About D-gluconate metabolic process
What is GO:0019521 D-gluconate metabolic process?
GO:0019521 is a Gene Ontology biological process term defined as the chemical reactions and pathways involving D-gluconate, the anion of D-gluconic acid, the aldonic acid derived from glucose.
What genes are involved in D-gluconate metabolic process?
Key genes include gntK (gluconate kinase), gntD (gluconate dehydratase), gntP (gluconate permease), gntA (gluconate 2-dehydrogenase), and gntR (regulator) [2,3,4,5].
Which organisms use D-gluconate metabolic process?
Bacteria such as Pseudomonas putida and Gluconobacter strains, fungi such as Aspergillus niger, and archaea such as Thermoproteus tenax use this process [3,4,5,8].
How is D-gluconate metabolized in bacteria?
D-gluconate is transported into the cell, phosphorylated by gluconate kinase, dehydrated to 2-keto-3-deoxy-D-gluconate, or oxidized to ketogluconates, feeding into central metabolism [2,3,4,5].
What is the industrial importance of D-gluconate metabolism?
It is used for production of gluconic acid, sodium gluconate, and 2-keto-3-deoxy-D-gluconate, which have applications in food, pharmaceutical, and chemical industries [2,6,8].
Is D-gluconate metabolism related to human health?
Zinc gluconate is a dietary supplement, and its absorption depends on gluconate handling; however, direct links to human disease are not well established.
What enzymes catalyze D-gluconate metabolism?
Gluconate kinase, gluconate dehydratase, gluconate 2-dehydrogenase, and gluconate oxidase are major enzymes in this process [2,3,4,6].
How can CRISPR be used to study D-gluconate metabolic process?
CRISPR knockout, point mutation, knock-in, and overexpression can be used to test gene function, enzyme activity, and metabolic flux in D-gluconate pathways [7,8].
What is 2-keto-3-deoxy-D-gluconate?
2-Keto-3-deoxy-D-gluconate (KDG) is an intermediate produced by gluconate dehydratase from D-gluconate, and it is a key metabolite in the Entner-Doudoroff pathway [4,6].
Where can I find D-gluconate metabolic process annotations?
QuickGO provides the authoritative definition and annotation for GO:0019521, and PubMed literature describes experimental studies [2,3,4,5,6,7,8].
Conclusion
GO:0019521 D-gluconate metabolic process is a well-defined biological process that encompasses the transport, phosphorylation, dehydration, and oxidation of D-gluconate. It is central to microbial carbon metabolism and has broad applications in biotechnology and nutrition. Researchers can leverage CRISPR-based models to dissect gene function and engineer improved production strains. EDITGENE provides comprehensive services to support these studies, from knockout and point mutation to knock-in, overexpression, and library screening.
References
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- 2. Anastassiadis S et al.. 2007. Gluconic acid production.. Recent Pat Biotechnol 1(2):167-80 PMID: 19075839
- 3. Kataoka N. 2024. Ketogluconate production by Gluconobacter strains: enzymes and biotechnological applications.. Biosci Biotechnol Biochem 88(5):499-508 PMID: 38323387
- 4. Höfmann S et al.. 2022. Simplified Enzymatic Synthesis of 2-Keto-3-Deoxy-D-Gluconate from D-Gluconate Using the Gluconate Dehydratase from Thermoproteus tenax.. Methods Mol Biol 2522:351-362 PMID: 36125762
- 5. Al-Jobore A et al.. 1980. D-glucose and D-gluconate transport in vesicles from Pseudomonas putida.. Can J Biochem 58(12):1397-404 PMID: 7248836
- 6. Matsubara K et al.. 2014. One-step synthesis of 2-keto-3-deoxy-d-gluconate by biocatalytic dehydration of d-gluconate.. J Biotechnol 191:69-77 PMID: 25034432
- 7. Meyer F et al.. 2018. Methanol-essential growth of Escherichia coli.. Nat Commun 9(1):1508 PMID: 29666370
- 8. Sun J et al.. 2026. Enhancing thermotolerance of Aspergillus niger for sodium gluconate production by combining metabolic engineering and fermentation process optimization.. Bioresour Technol 453:134659 PMID: 42002158
