GO:0016706 2-oxoglutarate-dependent dioxygenase activity: Mechanism, Genes and Research Methods
Research-grade guide for scientists and biopharma professionals
Key Takeaways
• GO:0016706 describes a dioxygenase reaction that consumes 2-oxoglutarate (2-OG), O2, and a primary substrate, producing succinate, CO2, and a hydroxylated product.
• The reaction is Fe(II)-dependent and proceeds via a reactive Fe(IV)-oxo intermediate, making these enzymes sensitive to oxygen and metabolic status.
• The superfamily includes prolyl hydroxylases, JmjC-domain histone demethylases, and plant 2-OG dioxygenases such as F3H, FNS I, FLS, and LDOX/ANS.
• In plants, 2-OG dioxygenases control flavonoid, glucosinolate, and triterpenoid saponin biosynthesis, with direct relevance to crop quality [2,6,7].
• In humans, 2-OG dioxygenases act as oxygen sensors and epigenetic regulators, linking them to cancer, leukemia, and hypoxia adaptation [1,3,5].
• CRISPR knockout, point-mutation, knock-in, and overexpression models are essential to dissect the causal roles of these enzymes in disease and metabolism [3,4].
Description
2-oxoglutarate-dependent dioxygenases (2-OGDDs) are a large superfamily of enzymes that catalyze oxidation-reduction reactions using 2-oxoglutarate (2-OG) as a co-substrate and Fe(II) as a cofactor. They are defined by GO:0016706, which captures the reaction A + 2-oxoglutarate + O2 = B + succinate + CO2, where one atom of oxygen is incorporated into each donor. This chemistry enables hydroxylation, demethylation, and oxidative rearrangement of diverse substrates, from proteins and nucleic acids to plant secondary metabolites [5,6]. Because the reaction consumes oxygen and 2-OG, these enzymes are positioned at the interface of cellular metabolism and gene regulation [1,5]. In cancer, hypoxia and metabolic reprogramming alter 2-OG availability, directly impacting 2-OGDD activity and downstream epigenetic marks. In plants, 2-OGDDs are key biosynthetic enzymes for flavonoids, glucosinolates, and triterpenoid saponins, making them targets for crop improvement [2,6,7]. The breadth of functions explains why GO:0016706 is a recurring annotation in genomics, proteomics, and functional studies [3,4]. Researchers studying this term need robust experimental systems to test causality, and CRISPR-based models provide that precision [3,4].
2-oxoglutarate-dependent dioxygenase activity At A Glance
| GO ID | GO:0016706 |
|---|---|
| GO term | 2-oxoglutarate-dependent dioxygenase activity |
| Ontology | molecular_function |
| Synonym | 2-oxoglutarate dioxygenase activity; oxidoreductase activity, acting on paired donors, with incorporation or reduction of molecular oxygen, 2-oxoglutarate as one donor, and incorporation of one atom each of oxygen into both donors |
| Major function | Catalyzes oxidation-reduction using 2-oxoglutarate and O2, producing succinate, CO2, and a hydroxylated/oxidized substrate |
| Cofactors | Fe(II) and ascorbate are typically required for catalytic activity |
| Substrates | 2-oxoglutarate, O2, and a primary substrate such as a protein, histone, or plant secondary metabolite [5,6] |
| Products | Succinate, CO2, and a modified (often hydroxylated) substrate |
| Representative families | Prolyl hydroxylases, JmjC histone demethylases, plant flavonoid and glucosinolate dioxygenases [5,6,7] |
What Is GO:0016706?
GO:0016706 describes the catalysis of a reaction in which 2-oxoglutarate and O2 are consumed, and succinate, CO2, and a modified substrate are produced. It is an oxidation-reduction reaction where one atom of oxygen from O2 is incorporated into each of two donors: 2-oxoglutarate (which becomes succinate and CO2) and the primary substrate (which becomes hydroxylated or otherwise oxidized). The term is synonymous with 2-oxoglutarate dioxygenase activity and with oxidoreductase activity acting on paired donors with incorporation or reduction of molecular oxygen, using 2-oxoglutarate as one donor and incorporating one atom of oxygen into each donor.
Why Is 2-oxoglutarate-dependent dioxygenase activity Important in Cell Biology?
GO:0016706 is important because it defines a reaction that couples central metabolism to a wide range of biological outputs, including oxygen sensing, epigenetic regulation, and biosynthesis of plant natural products [1,5,6]. In humans, 2-OGDDs such as prolyl hydroxylases and JmjC demethylases are directly implicated in cancer, hypoxia adaptation, and leukemia [1,3,5]. In plants, these enzymes determine the accumulation of flavonoids, glucosinolates, and triterpenoid saponins, which affect nutritional quality and medicinal value [2,6,7]. Because the reaction depends on Fe(II), 2-OG, and oxygen, it is also a sensitive node for metabolic and redox regulation. Functional annotation of GO:0016706 therefore helps researchers prioritize genes for mechanistic studies and therapeutic or agricultural intervention [3,4].
• Links oxygen and 2-oxoglutarate availability to cellular signaling and gene expression [1,5].
• Controls epigenetic marks through JmjC-domain histone demethylases.
• Regulates hypoxia-inducible factor (HIF) stability via prolyl hydroxylation [1,5].
• Drives plant flavonoid and anthocyanin biosynthesis through F3H, FNS I, FLS, and LDOX/ANS.
• Determines glucosinolate profiles in Brassica crops via GRS1.
• Contributes to triterpenoid saponin biosynthesis in medicinal plants.
• Is recurrently annotated in cancer proteogenomic datasets, including acute myeloid leukemia.
• Provides a colorimetric assay target for inhibitor and activator screening.
• Serves as a model for Fe(II)/2-OG enzyme family evolution in plants.
• Enables CRISPR-based causal testing of metabolic and epigenetic hypotheses [3,4].
What Happens During 2-oxoglutarate-dependent dioxygenase activity?
Substrate binding and Fe(II) coordination
In simple terms: The enzyme first grabs its tools: iron, 2-oxoglutarate, and the target molecule.
The catalytic cycle begins with the binding of Fe(II) in the active site, where it is coordinated by a conserved His-X-Asp/His motif. 2-oxoglutarate then binds in a bidentate fashion to the iron, and the primary substrate occupies a nearby pocket. This ternary complex positions the substrate for oxidation and is a prerequisite for subsequent chemistry. In plant 2-OGDDs such as F3H and FLS, substrate binding is similarly ordered and determines product specificity.
Oxidative decarboxylation of 2-oxoglutarate
In simple terms: Oxygen splits 2-oxoglutarate, releasing CO2 and creating a highly reactive iron-oxygen species.
Upon binding of O2, the Fe(II) center is oxidized and 2-oxoglutarate undergoes oxidative decarboxylation to succinate and CO2. This step generates a high-valent Fe(IV)-oxo intermediate, which is the species responsible for substrate oxidation. The reaction stoichiometry matches the GO definition: one atom of oxygen is incorporated into succinate/CO2, and one atom is incorporated into the substrate.
Substrate hydroxylation or demethylation
In simple terms: The reactive iron-oxygen species modifies the target molecule, often by adding an oxygen atom.
The Fe(IV)-oxo intermediate abstracts a hydrogen atom from the substrate, followed by oxygen rebound to yield a hydroxylated product. In histone demethylases, this chemistry leads to demethylation of methylated lysine residues, while in prolyl hydroxylases it hydroxylates proline residues on HIF-alpha. In plants, the same mechanism hydroxylates flavonoid precursors, driving the formation of dihydroflavonols and anthocyanidins.
Product release and enzyme reset
In simple terms: The modified product leaves, and the enzyme returns to its starting state.
After substrate oxidation, succinate, CO2, and the modified substrate are released, and the Fe(II) center is restored for another round of catalysis. Ascorbate is often required to maintain iron in the reduced state and to prevent oxidative inactivation. This catalytic cycle is conserved across the 2-OGDD superfamily, including plant enzymes involved in glucosinolate and saponin biosynthesis [2,7].
Key Genes Involved in GO:0016706 2-oxoglutarate-dependent dioxygenase activity
The following genes encode representative 2-oxoglutarate-dependent dioxygenases and related proteins that are experimentally tractable for functional studies.
| Gene | Major Role | Research Relevance |
|---|---|---|
| EGLN1 (PHD2) | Prolyl hydroxylase that targets HIF-alpha for degradation | Oxygen sensing and cancer hypoxia studies [1,5] |
| EGLN2 (PHD1) | Prolyl hydroxylase regulating HIF stability | Metabolic adaptation in hypoxia |
| EGLN3 (PHD3) | Prolyl hydroxylase involved in cell survival | Cancer and metabolic stress responses |
| KDM4A (JMJD2A) | JmjC histone demethylase acting on H3K9me3/H3K36me3 | Epigenetic regulation and cancer |
| KDM5A (JARID1A) | Histone demethylase targeting H3K4me3 | Leukemia and stem cell biology |
| KDM6A (UTX) | Histone demethylase for H3K27me3 | Developmental and cancer epigenetics |
| F3H | Flavonoid 3-hydroxylase in flavonoid biosynthesis | Plant flavonoid pathway engineering |
| FNS I | Flavone synthase I converting flavanones to flavones | Plant secondary metabolism |
| FLS | Flavonol synthase producing flavonols | Antioxidant and crop quality studies |
| LDOX/ANS | Leucoanthocyanidin dioxygenase/anthocyanidin synthase | Anthocyanin biosynthesis and color traits |
| GRS1 | Glucoraphasatin synthase 1 for aliphatic glucosinolates | Brassica crop quality |
| CYP716A subfamily | Cytochrome P450s in triterpenoid saponin biosynthesis | Medicinal plant metabolic engineering |
| TTS (triterpene synthase) | Triterpene scaffold formation in astragalosides | Saponin biosynthesis |
| 2-OGDD family members in chickpea | Diverse roles in plant development and stress | Functional characterization of plant 2-OGDDs |
| TET1 | DNA demethylase (5mC to 5hmC) | Epigenetic regulation and cancer |
| TET2 | DNA demethylase mutated in myeloid malignancies | Leukemia and clonal hematopoiesis |
| ALKBH5 | RNA demethylase (m6A) | RNA modification and cancer |
How Is 2-oxoglutarate-dependent dioxygenase activity Regulated?
2-OGDD activity is regulated by the availability of its co-substrates and cofactors. Oxygen tension directly controls the reaction rate, making these enzymes molecular sensors of cellular oxygen and metabolic status. 2-oxoglutarate levels, which are influenced by the TCA cycle and glutaminolysis, modulate enzyme activity and can be altered in cancer. Fe(II) and ascorbate availability also affect catalysis, and oxidative stress can inactivate the enzymes. In plants, developmental and environmental cues regulate the expression of 2-OGDD genes, as shown for flavonoid and glucosinolate pathways [6,7]. Post-translational modifications and protein-protein interactions further tune activity, although the precise mechanisms vary by family member.
2-oxoglutarate-dependent dioxygenase activity and Human Disease
| Gene | Disease / Biology | Potential Experimental Model |
|---|---|---|
| EGLN1 (PHD2) | Hypoxia adaptation and cancer | Knockout in cancer cell lines followed by HIF reporter assay |
| TET2 | Myeloid leukemia and clonal hematopoiesis | Point mutation knock-in in hematopoietic cells [3,5] |
| KDM5A | Leukemia stem cell maintenance | CRISPR knockout in AML cell lines |
| GRS1 | Glucosinolate profile in Brassica crops | Knockout in radish or Chinese cabbage |
| F3H | Flavonoid and anthocyanin content | Overexpression in plant callus or transient assays |
Cancer and hypoxia adaptation
In cancer, hypoxia and metabolic reprogramming reduce oxygen and 2-oxoglutarate availability, which inhibits prolyl hydroxylases and stabilizes HIF-alpha, promoting angiogenesis and survival. JmjC histone demethylases and TET enzymes are also 2-OGDDs, and their dysregulation alters epigenetic landscapes in tumors. Proteogenomic studies of acute myeloid leukemia have identified 2-OGDD-related proteins and phosphosites, highlighting their relevance to leukemia biology.
Leukemia and epigenetic dysregulation
Mutations in TET2, a 2-OGDD that oxidizes 5-methylcytosine, are common in myeloid malignancies and lead to DNA hypermethylation and altered gene expression [3,5]. KDM5A and other JmjC demethylases contribute to leukemic stem cell maintenance, making them potential therapeutic targets. The dependence of these enzymes on 2-OG and oxygen links leukemia metabolism to epigenetic state [1,3].
Plant metabolism and crop quality
In plants, 2-OGDDs such as F3H, FNS I, FLS, and LDOX/ANS control flavonoid and anthocyanin accumulation, affecting nutritional and visual traits. GRS1 determines aliphatic glucosinolate profiles in radish and Chinese cabbage, which influence flavor and health-promoting properties. Triterpenoid saponin biosynthesis in medicinal plants also involves 2-OGDD-like chemistry, as shown for astragalosides.
From 2-oxoglutarate-dependent dioxygenase activity-Related Genes to Experimental Models
| Research Question | Suitable Model |
|---|---|
| Does loss of a 2-OGDD alter HIF target genes? | CRISPR knockout of EGLN1 in cancer cell lines |
| Does a point mutation in TET2 affect DNA methylation? | Point-mutation knock-in in leukemia cell lines [3,5] |
| Can a plant 2-OGDD be tagged for localization? | Tagged knock-in of F3H or FLS in plant cells |
| Does overexpression of GRS1 change glucosinolate levels? | Overexpression in Brassica species |
| Can a 2-OGDD inhibitor be screened? | Colorimetric assay with recombinant enzyme |
| Is a chickpea 2-OGDD involved in stress response? | Knockout or overexpression in chickpea hairy roots |
How to Study the 2-oxoglutarate-dependent dioxygenase activity Process
| Method | What It Measures | Typical Application |
|---|---|---|
| Colorimetric assay | Succinate or formaldehyde production | Inhibitor screening and kinetics |
| Proteomics | Protein abundance and modifications | Cancer and leukemia profiling |
| Phosphoproteomics | Phosphorylation sites on 2-OGDDs | Signaling studies in AML |
| RNA-seq | Transcript levels of 2-OGDD genes | Plant stress and development [4,6] |
| Metabolic labeling | Flux through 2-OGDD reactions | Hypoxia and cancer metabolism |
| Enzyme activity assay | Catalytic rate with varying substrates | Mechanistic characterization |
| CRISPR screening | Gene essentiality and pathway dependencies | Cancer and plant functional genomics [3,4] |
Colorimetric and enzymatic assays
A colorimetric assay for Fe(II)/2-OG-dependent dioxygenases has been developed to measure activity by detecting succinate or formaldehyde release, enabling inhibitor screening and kinetic characterization. Such assays are typically performed with recombinant enzyme and saturating cofactors.
Proteomics and phosphoproteomics
Large-scale proteomic and phosphoproteomic profiling of acute myeloid leukemia has revealed expression and phosphorylation patterns of 2-OGDD-related proteins, providing a resource for hypothesis generation. These datasets can be mined to identify candidate enzymes for functional follow-up.
Plant functional genomics
In chickpea, functional characterization of the 2-OGDD gene family has been performed using expression profiling and heterologous expression, establishing roles in development and stress. Similar approaches in Brassica have linked GRS1 to glucosinolate variation.
Metabolic and isotopic labeling
Tracing of 2-oxoglutarate and oxygen consumption using isotopic labels can quantify flux through 2-OGDD reactions. This approach has been used to study metabolic adaptation in hypoxia and cancer and to dissect plant secondary metabolism [2,6].
How CRISPR Can Be Used to Study GO:0016706 2-oxoglutarate-dependent dioxygenase activity
Knockout
CRISPR knockout of 2-OGDD genes such as EGLN1 or KDM5A allows researchers to test loss-of-function phenotypes, including HIF stabilization or changes in histone methylation [1,3]. In plants, knockout of F3H or GRS1 can reveal their contribution to flavonoid or glucosinolate profiles [6,7].
Point Mutation
Point mutations in catalytic residues or substrate-binding pockets of TET2 or other 2-OGDDs can mimic disease-associated variants and dissect their impact on DNA methylation and gene expression [3,5]. This approach is valuable for separating catalytic from non-catalytic functions.
Knock-in
Tagged knock-in of endogenous 2-OGDD genes enables localization and interaction studies under native regulation. For example, tagging FLS or F3H in plant cells can reveal subcellular trafficking and complex formation.
Overexpression
Overexpression of plant 2-OGDDs such as GRS1 or F3H can increase flux through specific biosynthetic pathways, providing a strategy for metabolic engineering [6,7]. In human cells, overexpression of prolyl hydroxylases can suppress HIF signaling and reduce tumor growth in models.
How EDITGENE Supports 2-oxoglutarate-dependent dioxygenase activity Research
Researchers studying 2-oxoglutarate-dependent dioxygenase activity-related genes often need to determine whether a candidate gene is causally involved in a metabolic, epigenetic, or disease phenotype. EDITGENE provides a comprehensive suite of CRISPR-based services to generate precisely engineered cell and plant models, enabling rigorous functional validation of GO:0016706-associated genes.
Contact EDITGENE today to design your custom CRISPR model for 2-oxoglutarate-dependent dioxygenase activity research.
Related Products
| Product name | Cat.No. | Species | Gene ID | |
|---|---|---|---|---|
| Tet1 Knockout Kupffer Cell Line | EDJ-KQ88 | Mouse | 52463 | Details Get a Quote |
| ALKBH5 Knockout HEK293 Cell Line | EDJ-KQ186 | Human | 54890 | Details Get a Quote |
| FTO Knockout HEK293 Cell Line | EDJ-KQ187 | Human | 79068 | Details Get a Quote |
| EGLN1 Knockout HEK293 Cell Line | EDJ-KQ1495 | Human | 54583 | Details Get a Quote |
| EGLN3 Knockout HEK293 Cell Line | EDJ-KQ1497 | Human | 112399 | Details Get a Quote |
| EGLN2 Knockout HEK293 Cell Line | EDJ-KQ1498 | Human | 112398 | Details Get a Quote |
| TET1 Knockout HEK293 Cell Line | EDJ-KQ3116 | Human | 80312 | Details Get a Quote |
| ALKBH2 Knockout HEK293 Cell Line | EDJ-KQ8103 | Human | 121642 | Details Get a Quote |
| KDM7A Knockout HEK293 Cell Line | EDJ-KQ8844 | Human | 80853 | Details Get a Quote |
| ALKBH7 Knockout HEK293 Cell Line | EDJ-KQ9243 | Human | 84266 | Details Get a Quote |
| ALKBH6 Knockout HEK293 Cell Line | EDJ-KQ10286 | Human | 84964 | Details Get a Quote |
| ALKBH8 Knockout HEK293 Cell Line | EDJ-KQ10786 | Human | 91801 | Details Get a Quote |
| P4HTM Knockout HEK293 Cell Line | EDJ-KQ11483 | Human | 54681 | Details Get a Quote |
| ALKBH4 Knockout HEK293 Cell Line | EDJ-KQ11586 | Human | 54784 | Details Get a Quote |
| PHYHD1 Knockout HEK293 Cell Line | EDJ-KQ11765 | Human | 254295 | Details Get a Quote |
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Frequently Asked Questions About 2-oxoglutarate-dependent dioxygenase activity
What is 2-oxoglutarate-dependent dioxygenase activity?
It is a molecular function defined by GO:0016706, where an enzyme uses 2-oxoglutarate, O2, and Fe(II) to oxidize a substrate, producing succinate, CO2, and a modified product.
What genes are involved in 2-oxoglutarate-dependent dioxygenase activity?
Key genes include EGLN1-3 (prolyl hydroxylases), KDM4A, KDM5A, KDM6A (histone demethylases), TET1/2 (DNA demethylases), and plant genes such as F3H, FNS I, FLS, LDOX/ANS, and GRS1 [1,3,5,6,7].
What is the role of 2-oxoglutarate in this reaction?
2-oxoglutarate acts as a co-substrate that is decarboxylated to succinate and CO2, providing electrons for the oxidation of the primary substrate.
How is 2-oxoglutarate-dependent dioxygenase activity measured?
It can be measured using colorimetric assays that detect succinate or formaldehyde, or by monitoring substrate hydroxylation with mass spectrometry or fluorescence.
Why is 2-oxoglutarate-dependent dioxygenase important in cancer?
These enzymes sense oxygen and metabolites, and their dysregulation affects HIF signaling, epigenetic marks, and leukemia development [1,3,5].
What are examples of 2-oxoglutarate-dependent dioxygenases in plants?
F3H, FNS I, FLS, and LDOX/ANS are involved in flavonoid biosynthesis, while GRS1 controls glucosinolate profiles in Brassica crops [6,7].
How can CRISPR be used to study 2-oxoglutarate-dependent dioxygenases?
CRISPR knockout, point mutation, knock-in, and overexpression allow causal testing of gene function in cancer, metabolism, and plant biology [3,4].
What cofactors are required for 2-oxoglutarate-dependent dioxygenase activity?
Fe(II) and ascorbate are typically required, in addition to 2-oxoglutarate and molecular oxygen.
Are 2-oxoglutarate-dependent dioxygenases involved in epigenetics?
Yes, JmjC histone demethylases and TET DNA demethylases are 2-OGDDs that remove methyl marks and regulate gene expression.
What diseases are linked to 2-oxoglutarate-dependent dioxygenase mutations?
Mutations in TET2 are linked to myeloid leukemia, and dysregulation of prolyl hydroxylases contributes to cancer hypoxia adaptation [1,3,5].
Conclusion
GO:0016706 defines a versatile and biologically central enzyme activity that connects oxygen and 2-oxoglutarate metabolism to epigenetic regulation, cancer biology, and plant natural product biosynthesis [1,5,6]. The superfamily includes clinically relevant prolyl hydroxylases and demethylases as well as crop-improving plant enzymes [3,6,7]. Functional studies using CRISPR knockout, point mutation, knock-in, and overexpression are essential to establish causality and to translate these findings into therapeutics or improved crops [3,4]. EDITGENE provides the tools and expertise to accelerate this research.
References
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- 3. Kramer MH et al.. 2022. Proteomic and phosphoproteomic landscapes of acute myeloid leukemia.. Blood 140(13):1533-1548 PMID: 35895896
- 4. Saxena S et al.. 2023. Functional characterization of 2-oxoglutarate-dependent dioxygenase gene family in chickpea.. Plant Sci 336:111836 PMID: 37619866
- 5. Nakayama K et al.. 2025. [2-oxoglutarate-dependent dioxygenase family as a molecular sensor for cellular oxygen and metabolic sensing].. Nihon Yakurigaku Zasshi 160(4):251-255 PMID: 40603030
- 6. Wang Y et al.. 2021. Roles of the 2-Oxoglutarate-Dependent Dioxygenase Superfamily in the Flavonoid Pathway: A Review of the Functional Diversity of F3H, FNS I, FLS, and LDOX/ANS.. Molecules 26(21) PMID: 34771153
- 7. Choi P et al.. 2024. A 2-oxoglutarate-dependent dioxygenase, GLUCORAPHASATIN SYNTHASE 1 (GRS1) is a major determinant for different aliphatic glucosinolates between radish and Chinese cabbage.. Plant Mol Biol 115(1):1 PMID: 39656296
- 8. Guo C et al.. 2018. Developing a colorimetric assay for Fe(II)/2-oxoglutarate-dependent dioxygenase.. Anal Biochem 548:109-114 PMID: 29499175
