GO:0019135 deoxyhypusine monooxygenase activity: Mechanism, Genes and Research Methods
Research-grade guide for scientists and biopharma professionals
Key Takeaways
• GO:0019135 deoxyhypusine monooxygenase activity is the dioxygenase reaction that converts deoxyhypusine to hypusine on eIF5A, using O2 and a hydrogen donor.
• The reaction is the second and final step of eIF5A hypusination, a unique polyamine-dependent post-translational modification essential for eukaryotic translation.
• DOHH, the enzyme responsible for this activity, is a HEAT-repeat-containing Fe(II)/2-oxoglutarate-dependent dioxygenase that hydroxylates the deoxyhypusine residue.
• Hypusinated eIF5A supports translation elongation of specific mRNAs, mitochondrial respiration, macrophage activation, and fatty acid oxidation.
• Dysregulation of hypusination is linked to cancer progression, metabolic disease, neurodevelopmental disorders, and polyaminopathies.
• CRISPR knockout, point-mutation, knock-in, and overexpression models enable causal dissection of DOHH and eIF5A hypusination in disease and translation control.
Description
GO:0019135 deoxyhypusine monooxygenase activity is a molecular function that catalyzes the final step in the biosynthesis of hypusine, a rare amino acid found in the eukaryotic translation initiation factor 5A (eIF5A). This activity is essential for converting the intermediate deoxyhypusine into hypusine, a modification required for eIF5A to function in translation elongation. The reaction consumes oxygen and a hydrogen donor, and it is carried out by the enzyme deoxyhypusine hydroxylase (DOHH). Because hypusination is the only known post-translational modification of eIF5A and is highly conserved across eukaryotes, researchers study this activity to understand fundamental translation control and its roles in health and disease. The importance of GO:0019135 extends beyond basic biochemistry. Hypusinated eIF5A is required for the translation of mRNAs encoding proteins with consecutive proline residues, and it modulates mitochondrial respiration, immune cell activation, and lipid metabolism. In cancer, aspartate signaling can drive lung metastasis through alternative translation that depends on hypusination. In metabolic disease, spermidine-mediated hypusination improves mitochondrial fatty acid oxidation and prevents non-alcoholic steatohepatitis progression. Genetic defects in the hypusination pathway are associated with neurodevelopmental disorders and polyaminopathies. Thus, deoxyhypusine monooxygenase activity sits at the crossroads of polyamine metabolism, translation, and human disease. For researchers, GO:0019135 provides a precise functional annotation for studies of DOHH and eIF5A biology. Assays for deoxyhypusine hydroxylase activity have been developed to measure this reaction directly, and structural studies have revealed how deoxyhypusination complexes assemble. This article summarizes the mechanism, key genes, disease links, and experimental models relevant to GO:0019135, with an emphasis on CRISPR-based approaches for causal interrogation.
deoxyhypusine monooxygenase activity At A Glance
| GO ID | GO:0019135 |
|---|---|
| GO term | deoxyhypusine monooxygenase activity |
| Ontology | molecular_function |
| Synonym | deoxyhypusine dioxygenase activity; deoxyhypusine hydroxylase activity; DOHH activity |
| Major function | Catalyzes the hydroxylation of deoxyhypusine to hypusine on eIF5A, the final step of hypusination |
| Cofactors | Fe(II) and 2-oxoglutarate (or a hydrogen donor) are required for dioxygenase activity |
| Substrate | Protein N6-(4-aminobutyl)-L-lysine (deoxyhypusine residue) |
| Product | Protein N6-((R)-4-amino-2-hydroxybutyl)-L-lysine (hypusine residue) |
| Pathway | Polyamine metabolism and eIF5A hypusination |
What Is GO:0019135?
GO:0019135 deoxyhypusine monooxygenase activity is defined as the catalysis of the reaction: protein N6-(4-aminobutyl)-L-lysine + donor-H2 + O2 = protein N6-((R)-4-amino-2-hydroxybutyl)-L-lysine + acceptor + H2O. In simpler terms, it is the oxygen-dependent hydroxylation of a deoxyhypusine residue on a protein to form hypusine, using a hydrogen donor as a co-substrate. This activity is synonymous with deoxyhypusine dioxygenase activity, deoxyhypusine hydroxylase activity, and DOHH activity.
Why Is deoxyhypusine monooxygenase activity Important in Cell Biology?
GO:0019135 is important because it represents the committed step that produces hypusine, a modification essential for eIF5A function in translation elongation. Without this activity, eIF5A remains in its deoxyhypusine form and cannot support the translation of specific mRNAs, leading to defects in mitochondrial respiration, immune activation, and metabolic homeostasis. The reaction is also a potential therapeutic target: inhibiting hypusination has been explored in cancer and immune contexts. Understanding this activity at molecular, cellular, and organismal levels is therefore critical for both basic biology and translational research.
• Required for eIF5A hypusination, a unique post-translational modification conserved in eukaryotes.
• Supports translation elongation of mRNAs encoding proline-rich proteins.
• Modulates mitochondrial respiration and macrophage activation.
• Improves mitochondrial fatty acid oxidation and protects against non-alcoholic steatohepatitis.
• Drives alternative translation that promotes lung metastasis in cancer.
• Linked to neurodevelopmental disorders and polyaminopathies.
• Provides a druggable node in polyamine and translation pathways.
• Enables mechanistic studies using deoxyhypusine hydroxylase activity assays.
• Structural insights into deoxyhypusination complexes inform inhibitor design.
• Serves as a biomarker for hypusination status in disease models.
Molecular Mechanism of deoxyhypusine monooxygenase activity
Substrate recognition and binding
In simple terms: The enzyme finds and grabs the deoxyhypusine residue on eIF5A.
Deoxyhypusine hydroxylase (DOHH) recognizes the deoxyhypusine residue, which is formed on eIF5A by deoxyhypusine synthase (DHS) using spermidine as an aminobutyl donor. The substrate is a protein N6-(4-aminobutyl)-L-lysine residue, and DOHH binds this modified lysine within the eIF5A context. Structural studies of deoxyhypusination complexes have revealed how DOHH interacts with eIF5A to position the deoxyhypusine side chain for catalysis.
Catalytic hydroxylation
In simple terms: The enzyme adds an oxygen atom to deoxyhypusine to make hypusine.
DOHH catalyzes the hydroxylation of the deoxyhypusine residue using molecular oxygen and a hydrogen donor, producing hypusine and water. This reaction is a dioxygenase-type oxidation, and the enzyme belongs to the Fe(II)/2-oxoglutarate-dependent dioxygenase family. The catalytic cycle involves activation of oxygen at a non-heme iron center, followed by hydroxylation of the substrate.
Cofactor requirements and metal center
In simple terms: The enzyme needs iron and a small molecule helper to work.
DOHH requires Fe(II) as a cofactor, and the reaction is dependent on 2-oxoglutarate or a suitable hydrogen donor. The enzyme contains a dinuclear iron center coordinated by conserved histidine and glutamate residues within HEAT-repeat domains. This metal center is essential for catalytic activity, as chelation of iron abolishes deoxyhypusine hydroxylase activity.
Product formation and eIF5A maturation
In simple terms: The final product, hypusine, makes eIF5A ready to do its job.
The hydroxylation of deoxyhypusine to hypusine completes the hypusination of eIF5A, converting it to its active form. Hypusinated eIF5A is then able to participate in translation elongation, particularly at ribosomes stalled on proline-rich sequences. This maturation step is critical for eIF5A function in mitochondrial respiration, immune cell activation, and metabolic regulation.
Regulation by polyamine availability
In simple terms: The amount of polyamines in the cell controls how much hypusine is made.
Hypusination is dependent on the polyamine spermidine, which provides the aminobutyl group for the first step catalyzed by DHS. Consequently, deoxyhypusine monooxygenase activity is indirectly regulated by polyamine levels, and spermidine supplementation can enhance hypusination. In cancer, aspartate signaling can influence polyamine metabolism and alternative translation in a hypusination-dependent manner.
Key Genes Involved in GO:0019135 deoxyhypusine monooxygenase activity
The following genes and proteins are central to deoxyhypusine monooxygenase activity, its regulation, and its downstream effects.
| Gene | Major Role | Research Relevance |
|---|---|---|
| DOHH | Enzyme catalyzing deoxyhypusine hydroxylation (GO:0019135) | Direct target for knockout, point mutation, and activity assays |
| EIF5A | Substrate protein that receives hypusine modification | Key effector of hypusination in translation and disease |
| DHPS | Deoxyhypusine synthase, first step of hypusination | Upstream regulator of DOHH substrate availability |
| ODC1 | Ornithine decarboxylase, polyamine biosynthesis | Controls spermidine levels for hypusination |
| AMD1 | S-adenosylmethionine decarboxylase, polyamine biosynthesis | Regulates polyamine flux and hypusination |
| SAT1 | Spermidine/spermine N1-acetyltransferase, polyamine catabolism | Modulates polyamine pools and hypusination |
| SLC3A2 | Amino acid transporter, aspartate signaling | Linked to hypusination-dependent lung metastasis |
| SLC7A11 | Cystine/glutamate transporter, redox and metabolism | May influence polyamine and hypusination pathways |
| MTOR | mTOR kinase, translation regulator | Coordinates translation and hypusination demand |
| ATF4 | Stress-responsive transcription factor | Regulates amino acid metabolism and hypusination |
| MYC | Oncogene, drives polyamine metabolism | Links hypusination to cancer proliferation |
| HIF1A | Hypoxia-inducible factor, oxygen sensing | May affect dioxygenase activity under hypoxia |
| PPARGC1A | PGC-1alpha, mitochondrial biogenesis | Downstream of hypusination in fatty acid oxidation |
| CPT1A | Carnitine palmitoyltransferase 1A, fatty acid oxidation | Effector of hypusination in NASH protection |
| SDHA | Succinate dehydrogenase, mitochondrial respiration | Hypusination supports mitochondrial respiration |
| NDUFA9 | Complex I subunit, mitochondrial respiration | Hypusination-dependent translation of mitochondrial proteins |
| RPLP0 | Ribosomal protein, translation | Context for proline-rich translation requiring eIF5A |
How Is deoxyhypusine monooxygenase activity Regulated?
Deoxyhypusine monooxygenase activity is regulated at multiple levels. Polyamine availability, particularly spermidine, controls the supply of deoxyhypusine substrate for DOHH. The expression and activity of DOHH itself can be modulated by cellular iron status and oxygen tension, given its dependence on Fe(II) and O2. In immune cells, hypusination is regulated during macrophage activation and is required for mitochondrial respiration. In metabolic tissues, spermidine-mediated hypusination is responsive to nutrient status and improves fatty acid oxidation. In cancer, aspartate signaling and alternative translation can drive hypusination-dependent metastasis. These layers of regulation ensure that eIF5A hypusination is coupled to cellular metabolic and translational demands.
deoxyhypusine monooxygenase activity and Human Disease
| Gene | Disease / Biology | Potential Experimental Model |
|---|---|---|
| DOHH | Neurodevelopmental disorder, polyaminopathy | Knockout and point-mutation cell models |
| EIF5A | Neurodevelopmental disorder, translation defect | Knock-in of patient variants |
| DHPS | Polyaminopathy, hypusination deficiency | Knockout and rescue models |
| ODC1 | Cancer, polyamine-driven proliferation | Overexpression and knockout models |
| SAT1 | Metabolic disease, polyamine imbalance | Knockout and overexpression models |
Cancer and metastasis
Hypusination and deoxyhypusine monooxygenase activity are implicated in cancer progression. Aspartate signaling drives lung metastasis via alternative translation that depends on eIF5A hypusination. Inhibiting hypusination has been proposed as a therapeutic strategy to block metastatic translation programs. The dependency on polyamine metabolism also links DOHH activity to oncogenic MYC signaling.
Metabolic and liver disease
Spermidine-mediated hypusination improves mitochondrial fatty acid oxidation and prevents non-alcoholic steatohepatitis progression. This suggests that deoxyhypusine monooxygenase activity supports metabolic homeostasis in the liver. Dysregulation of this pathway may contribute to steatosis and inflammation.
Neurodevelopmental disorders and polyaminopathies
Genetic defects in the hypusination pathway, including eIF5A and DOHH, are associated with neurodevelopmental disorders and polyaminopathies. These rare diseases highlight the critical role of deoxyhypusine monooxygenase activity in human development. Mutations affecting hypusine formation can lead to severe clinical phenotypes.
Immune and mitochondrial dysfunction
Hypusination modulates mitochondrial respiration and macrophage activation, linking deoxyhypusine monooxygenase activity to immune responses. Loss of hypusination impairs mitochondrial function and inflammatory capacity. This connection suggests roles in infectious and inflammatory diseases.
From deoxyhypusine monooxygenase activity-Related Genes to Experimental Models
| Research Question | Suitable Model |
|---|---|
| Does DOHH loss abolish hypusine formation? | DOHH knockout cell line |
| Which residues are required for catalytic activity? | Point-mutation knock-in of DOHH |
| How does hypusination affect translation? | Tagged EIF5A knock-in for Ribo-seq |
| Does DOHH overexpression enhance hypusination? | DOHH overexpression cell model |
| Can hypusination be targeted in cancer? | DOHH knockout in cancer cell lines |
| What is the role of DOHH in immune cells? | Conditional knockout in macrophages |
How to Study the deoxyhypusine monooxygenase activity Process
| Method | What It Measures | Typical Application |
|---|---|---|
| Deoxyhypusine hydroxylase activity assay | Enzymatic conversion of deoxyhypusine to hypusine | Validation of DOHH activity |
| Ribo-seq | Translation efficiency at codon resolution | Identification of hypusination-dependent mRNAs |
| Mass spectrometry | Hypusine modification on eIF5A | Quantification of hypusination status |
| Immunoblotting | Protein levels and hypusine modification | Validation of knockout/knock-in |
| Seahorse respirometry | Mitochondrial respiration | Metabolic impact of hypusination |
| Fatty acid oxidation assay | Beta-oxidation flux | Liver and metabolic disease models |
| RNA-seq | Transcriptome changes | Pathway analysis after DOHH perturbation |
| CRISPR screening | Gene dependencies and modifiers | Discovery of hypusination regulators |
Deoxyhypusine hydroxylase activity assay
Direct measurement of GO:0019135 can be performed using assays that monitor the conversion of deoxyhypusine to hypusine, as described in published protocols. These assays typically use radiolabeled or fluorescent substrates and require Fe(II) and a hydrogen donor. They are useful for validating enzyme activity in knockout or mutant backgrounds.
Ribosome profiling (Ribo-seq)
Ribo-seq measures translation at codon resolution and can reveal eIF5A-dependent translation of proline-rich sequences. Comparing wild-type and DOHH-knockout cells by Ribo-seq identifies mRNAs whose translation depends on hypusination. This method links deoxyhypusine monooxygenase activity to specific translation programs.
Proteomics and hypusine detection
Mass spectrometry-based proteomics can detect hypusine modification on eIF5A and quantify changes upon DOHH perturbation. Immunoblotting with anti-hypusine antibodies is a common validation method. These approaches confirm the functional impact of deoxyhypusine monooxygenase activity.
Metabolic and mitochondrial assays
Seahorse respirometry and fatty acid oxidation assays measure mitochondrial function downstream of hypusination. These methods are used to assess how deoxyhypusine monooxygenase activity affects cellular metabolism. They are particularly relevant in macrophage and hepatocyte models.
How CRISPR Can Be Used to Study GO:0019135 deoxyhypusine monooxygenase activity
Knockout
CRISPR knockout of DOHH or EIF5A eliminates deoxyhypusine monooxygenase activity and hypusination, respectively, providing a clean background to study loss-of-function phenotypes. Knockout models have been used to demonstrate the requirement for hypusination in mitochondrial respiration and macrophage activation. They are also valuable for validating inhibitor specificity.
Point Mutation
Point mutations in DOHH can be introduced to dissect catalytic residues and cofactor-binding sites identified by structural studies. Such mutants allow separation of enzymatic activity from protein-protein interactions. They are useful for modeling patient variants in neurodevelopmental disorders.
Knock-in
Knock-in of tagged EIF5A or DOHH enables affinity purification and localization studies. Tagged knock-in models can be used for Ribo-seq and proteomics to track hypusination in vivo. Knock-in of disease-associated variants helps establish causality.
Overexpression
Overexpression of DOHH or EIF5A can enhance hypusination and downstream translation. This approach is used to test sufficiency of hypusination in metabolic and immune phenotypes. Overexpression models also facilitate biochemical purification of the enzyme complex.
How EDITGENE Supports deoxyhypusine monooxygenase activity Research
Researchers studying deoxyhypusine monooxygenase activity-related genes often need to determine whether a candidate gene is causally involved in hypusination, translation control, or disease phenotypes. EDITGENE provides a comprehensive suite of CRISPR services to generate precisely engineered cell models for such investigations.
Contact EDITGENE today to design your custom CRISPR model for deoxyhypusine monooxygenase activity research.
Frequently Asked Questions About deoxyhypusine monooxygenase activity
What is deoxyhypusine monooxygenase activity?
It is the enzymatic activity (GO:0019135) that hydroxylates deoxyhypusine to hypusine on eIF5A, using oxygen and a hydrogen donor.
What genes are involved in deoxyhypusine monooxygenase activity?
The main gene is DOHH, which encodes deoxyhypusine hydroxylase; EIF5A is the substrate, and DHPS provides the deoxyhypusine intermediate.
What is the role of DOHH in hypusination?
DOHH catalyzes the final step of hypusination, converting deoxyhypusine to hypusine on eIF5A.
How is deoxyhypusine monooxygenase activity measured?
It can be measured using deoxyhypusine hydroxylase activity assays that monitor substrate conversion.
What diseases are linked to hypusination?
Cancer metastasis, metabolic liver disease, neurodevelopmental disorders, and polyaminopathies have been linked to hypusination.
Does hypusination affect mitochondrial function?
Yes, hypusination supports mitochondrial respiration and fatty acid oxidation.
What is the substrate of deoxyhypusine monooxygenase?
The substrate is a protein N6-(4-aminobutyl)-L-lysine residue, known as deoxyhypusine, on eIF5A.
What cofactors are required for DOHH activity?
Fe(II) and 2-oxoglutarate or a hydrogen donor are required.
Can CRISPR knockout DOHH?
Yes, CRISPR knockout of DOHH is a standard approach to eliminate deoxyhypusine monooxygenase activity.
Why is eIF5A hypusination important for translation?
Hypusinated eIF5A is required for translation elongation of proline-rich sequences and specific mRNAs.
Conclusion
GO:0019135 deoxyhypusine monooxygenase activity is a critical enzymatic function that completes the hypusination of eIF5A, a modification essential for translation, metabolism, and immune function. Its dysregulation is linked to cancer, metabolic disease, and neurodevelopmental disorders. Understanding this activity through biochemical assays, structural studies, and CRISPR models will continue to reveal therapeutic opportunities. EDITGENE offers the tools to interrogate this pathway with precision, from knockout to knock-in and screening services. By combining rigorous experimental models with bioinformatics, researchers can accelerate discoveries in hypusination biology.
References
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- 3. Zhou J et al.. 2022. Spermidine-mediated hypusination of translation factor EIF5A improves mitochondrial fatty acid oxidation and prevents non-alcoholic steatohepatitis progression.. Nat Commun 13(1):5202 PMID: 36057633
- 4. Park JH et al.. 2011. Assay of deoxyhypusine hydroxylase activity.. Methods Mol Biol 720:207-16 PMID: 21318876
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- 6. VanSickle EA et al.. 2026. Genetic and Phenotypic Features of the Five Known Polyaminopathies: A Critical Narrative Review.. Am J Med Genet A 200(5):993-1003 PMID: 41410504
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