GO:0046857 oxidoreductase activity, acting on other nitrogenous compounds as donors, with NAD or NADP as acceptor: Mechanism, Genes and Research Methods
Research-grade guide for scientists and biopharma professionals
Key Takeaways
• GO:0046857 describes a molecular function: redox catalysis where a nitrogenous donor (excluding NH and NH2 groups) reduces NAD+ or NADP+.
• The term is mechanistically linked to NAD(P)(H) homeostasis, because the reduced pyridine nucleotides generated feed biosynthetic and antioxidant pathways.
• Key enzymes and regulators include NADK, NADK2, NRK1, CCR4C, and mitochondrial NADPH-consuming systems.
• NAD(P)(H) balance controlled by these reactions supports proline biosynthesis, fatty acid synthesis, lipoylation, folate-dependent nucleotide synthesis, and T cell survival.
• Dysregulation is implicated in cancer, metabolic stress, and inflammatory disease, making the pathway a therapeutic target.
• CRISPR knockout, point-mutation, knock-in, and overexpression models enable causal testing of GO:0046857-related genes.
Description
GO:0046857 is a Gene Ontology molecular function term defined as catalysis of an oxidation-reduction reaction in which a nitrogenous group, excluding NH and NH2 groups, acts as a hydrogen or electron donor and reduces NAD or NADP. This places the term at the intersection of nitrogen metabolism and pyridine nucleotide biochemistry, where NAD(P)+ is converted to NAD(P)H to support reductive biosynthesis and redox defense. The function is not a single enzyme but a catalytic capability shared by diverse proteins that use nitrogen-containing donors such as amino acids, amines, or other nitrogenous compounds. Researchers study GO:0046857 because NAD(P)H generated by these reactions fuels pathways ranging from proline synthesis to mitochondrial fatty acid synthesis and lipoylation. In parallel, the same redox chemistry influences inflammatory capacity and survival of CD4+ T cells through cytoplasmic NAD/H synthesis. Understanding which enzymes carry GO:0046857 activity, how they are regulated, and how they contribute to disease provides a mechanistic basis for therapeutic targeting.
oxidoreductase activity, acting on other nitrogenous compounds as donors, with NAD or NADP as acceptor At A Glance
| GO ID | GO:0046857 |
|---|---|
| GO term | oxidoreductase activity, acting on other nitrogenous compounds as donors, with NAD or NADP as acceptor |
| Ontology | molecular_function |
| Synonym | none |
| Major function | Catalysis of redox reactions using nitrogenous donors (excluding NH/NH2) to reduce NAD+ or NADP+ |
| Donor specificity | Nitrogenous groups other than NH and NH2 |
| Acceptor specificity | NAD or NADP |
| Biological context | NAD(P)(H) homeostasis, reductive biosynthesis, redox defense |
| Representative regulators | NADK, NADK2, NRK1, CCR4C |
What Is GO:0046857?
In plain terms, GO:0046857 is the activity of an enzyme that takes electrons from a nitrogen-containing molecule (but not from free ammonia or an NH2 group) and hands them to NAD+ or NADP+, producing NADH or NADPH. The definition emphasizes two constraints: the donor must be a nitrogenous compound other than NH/NH2, and the acceptor must be NAD or NADP. This distinguishes the term from dehydrogenases that act on carbon donors or from NAD(P)H oxidases that run in the opposite direction. Because the reaction produces reduced pyridine nucleotides, GO:0046857 is functionally coupled to cellular redox balance and to biosynthetic pathways that consume NADPH.
Why Is oxidoreductase activity, acting on other nitrogenous compounds as donors, with NAD or NADP as acceptor Important in Cell Biology?
GO:0046857 matters because it defines a catalytic route that feeds NAD(P)H into essential biosynthetic and protective pathways. Mitochondrial NADP(H) generation is required for proline biosynthesis, and mitochondrial NADPH fuels fatty acid synthesis and lipoylation to power oxidative metabolism. Cytoplasmic NAD/H synthesis via NRK1 regulates inflammatory capacity and survival of CD4+ T cells, showing that the same redox logic controls immune cell fate. Cytosolic NADK is conditionally essential for folate-dependent nucleotide synthesis, linking GO:0046857-related NADP(H) supply to proliferation. NAD+ kinase is also a recognized therapeutic target in cancer, underscoring the translational relevance of this activity.
• Supports proline biosynthesis through mitochondrial NADP(H) generation.
• Fuels mitochondrial fatty acid synthesis and lipoylation for oxidative metabolism.
• Regulates inflammatory capacity and survival of CD4+ T cells via cytoplasmic NAD/H synthesis.
• Provides NADPH for folate-dependent nucleotide synthesis in proliferating cells.
• Contributes to NAD(P)(H) balance through NAD kinase and NADP(H) phosphatase regulation.
• Is a therapeutic target in cancer through NAD+ kinase inhibition.
• Connects nitrogen metabolism to redox homeostasis and antioxidant defense.
• Enables metabolic adaptation under stress by maintaining NADPH pools.
• Provides a mechanistic entry point for CRISPR screens of metabolic genes.
• Links mitochondrial and cytoplasmic NAD(P)(H) systems to immune function.
Molecular Mechanism of oxidoreductase activity, acting on other nitrogenous compounds as donors, with NAD or NADP as acceptor
Substrate recognition and donor specificity
In simple terms: The enzyme first binds a nitrogen-containing molecule that will donate electrons.
GO:0046857 enzymes recognize nitrogenous donors other than NH and NH2, which distinguishes them from ammonia-utilizing dehydrogenases. The donor can be an amino acid or another nitrogenous metabolite, and the enzyme positions it for hydride or electron transfer to NAD(P)+. This substrate selectivity is a defining feature of the term and determines which metabolic pools are linked to NAD(P)H production.
Hydride transfer to NAD or NADP
In simple terms: Electrons are transferred from the donor to NAD+ or NADP+, making NADH or NADPH.
The catalytic step reduces NAD+ or NADP+ to NADH or NADPH, generating the reduced pyridine nucleotide that drives downstream biosynthesis. NADP(H) is particularly important for reductive biosynthesis and antioxidant defense, while NAD(H) is more associated with catabolic and signaling roles. The balance between NAD and NADP pools is maintained by enzymes such as NAD kinase and NADP(H) phosphatases.
NAD(P)(H) homeostasis and compartmentalization
In simple terms: Cells keep separate NAD and NADP pools in different compartments to match local needs.
Mitochondrial NADP(H) generation is essential for proline biosynthesis, and mitochondrial NADPH fuels fatty acid synthesis and lipoylation. Cytoplasmic NAD/H synthesis via NRK1 regulates inflammatory capacity and promotes survival of CD4+ T cells. Cytosolic NADK is conditionally essential for folate-dependent nucleotide synthesis, showing compartment-specific roles for NADP(H) supply. CCR4C is a chloroplast-localized NADP(H) phosphatase that regulates NAD(P)(H) balance in Arabidopsis, illustrating conservation of these control mechanisms.
Coupling to biosynthetic and redox pathways
In simple terms: The NADPH made by these reactions is used to build molecules and fight oxidative stress.
NADPH produced through GO:0046857-related activities supports proline biosynthesis, fatty acid synthesis, and lipoylation. It also supports folate-dependent nucleotide synthesis, linking redox supply to proliferation. In immune cells, cytoplasmic NAD/H synthesis via NRK1 regulates inflammatory capacity and survival, connecting redox balance to cell fate.
Regulation by NAD kinase and NADP(H) phosphatases
In simple terms: Enzymes that make or break NADP control how much NADPH is available.
NAD+ kinase catalyzes the phosphorylation of NAD+ to NADP+ and is a key regulator of NADP(H) pools. Human NAD kinase structure and regulation have been resolved by cryo-EM, revealing mechanistic details of its control. CCR4C acts as a chloroplast-localized NADP(H) phosphatase regulating NAD(P)(H) balance, providing a counterbalancing activity. NAD+ kinase is also a therapeutic target in cancer, highlighting the importance of this regulatory node.
Key Genes Involved in GO:0046857 oxidoreductase activity, acting on other nitrogenous compounds as donors, with NAD or NADP as acceptor
The following genes and proteins are experimentally linked to NAD(P)(H) metabolism and GO:0046857-related redox chemistry.
| Gene | Major Role | Research Relevance |
|---|---|---|
| NADK | Phosphorylates NAD+ to NADP+ | Regulates NADP(H) pools; cancer target |
| NADK2 | Mitochondrial NAD kinase | Supports mitochondrial NADP(H) for proline synthesis |
| NRK1 | Cytoplasmic NAD/H synthesis | Regulates T cell inflammation and survival |
| CCR4C | Chloroplast NADP(H) phosphatase | Controls NAD(P)(H) balance in plants |
| NADSYN1 | NAD biosynthesis | Maintains NAD supply for redox reactions |
| NMNAT1 | NAD biosynthesis | Nuclear NAD+ production |
| NMNAT2 | NAD biosynthesis | Cytoplasmic NAD+ production |
| NMNAT3 | NAD biosynthesis | Mitochondrial NAD+ production |
| IDH1 | NADPH production | Cytosolic NADPH supply |
| IDH2 | NADPH production | Mitochondrial NADPH supply |
| ME1 | NADPH production | Malic enzyme, cytosolic NADPH |
| ME2 | NADPH production | Malic enzyme, mitochondrial NADPH |
| G6PD | NADPH production | Pentose phosphate pathway |
| PGD | NADPH production | Pentose phosphate pathway |
| MTHFD2 | Folate metabolism | Links NADPH to nucleotide synthesis |
| ALDH1L2 | Folate metabolism | Mitochondrial NADPH production |
| PRODH | Proline metabolism | Consumes NAD(P)+ in proline catabolism |
How Is oxidoreductase activity, acting on other nitrogenous compounds as donors, with NAD or NADP as acceptor Regulated?
GO:0046857-related activity is regulated at multiple levels. NAD+ kinase controls the conversion of NAD+ to NADP+, thereby setting the size of the NADP(H) pool available for reduction. Human NAD kinase is regulated structurally, as revealed by cryo-EM studies. CCR4C provides a counterbalancing NADP(H) phosphatase activity that adjusts NAD(P)(H) balance. Compartmentalization further regulates the function: mitochondrial NADP(H) generation is essential for proline biosynthesis, while cytoplasmic NAD/H synthesis via NRK1 controls inflammatory capacity in CD4+ T cells. Cytosolic NADK is conditionally essential for folate-dependent nucleotide synthesis, indicating that nutrient status and proliferation signals influence this regulatory node. Finally, NAD+ kinase is considered a therapeutic target in cancer, suggesting that its regulation is clinically relevant.
oxidoreductase activity, acting on other nitrogenous compounds as donors, with NAD or NADP as acceptor and Human Disease
| Gene | Disease / Biology | Potential Experimental Model |
|---|---|---|
| NADK | Cancer metabolism | Knockout and point-mutation cell lines |
| NADK2 | Mitochondrial proline biosynthesis | Knockout cells with proline rescue |
| NRK1 | T cell inflammation and survival | Knockout CD4+ T cells |
| CCR4C | Plant NAD(P)(H) balance | Arabidopsis knockout |
| MTHFD2 | Folate-dependent nucleotide synthesis | Knockout cancer cells |
Cancer metabolism and NAD+ kinase targeting
NAD+ kinase is a therapeutic target in cancer, and its activity influences NADP(H) pools that support biosynthetic and antioxidant pathways. Cytosolic NADK is conditionally essential for folate-dependent nucleotide synthesis, which is required for proliferation. These findings link GO:0046857-related redox supply to tumor growth and suggest that inhibiting NADP(H) production may be a therapeutic strategy.
Inflammatory and immune cell function
Cytoplasmic NAD/H synthesis via NRK1 regulates inflammatory capacity and promotes survival of CD4+ T cells. This connects NAD(P)(H) balance to immune cell fate and suggests that GO:0046857-related reactions may influence inflammatory disease.
Mitochondrial metabolic disorders
Mitochondrial NADP(H) generation is essential for proline biosynthesis, and mitochondrial NADPH fuels fatty acid synthesis and lipoylation to power oxidative metabolism. Disruption of these pathways could impair mitochondrial function and contribute to metabolic disease.
Plant and chloroplast NAD(P)(H) balance
CCR4C is a chloroplast-localized NADP(H) phosphatase regulating NAD(P)(H) balance in Arabidopsis, showing that GO:0046857-related redox control is conserved and relevant to plant biology.
From oxidoreductase activity, acting on other nitrogenous compounds as donors, with NAD or NADP as acceptor-Related Genes to Experimental Models
| Research Question | Suitable Model |
|---|---|
| Is NADK required for NADP(H) supply? | NADK knockout cell line |
| Does NADK2 support proline synthesis? | NADK2 knockout with proline measurement |
| How does NRK1 affect T cell survival? | NRK1 knockout CD4+ T cells |
| What is the role of CCR4C in NAD(P)(H) balance? | CCR4C knockout Arabidopsis |
| Is cytosolic NADK essential for nucleotide synthesis? | NADK knockout with folate labeling |
| Can NADK inhibition target cancer? | NADK point-mutation and inhibitor models |
How to Study the oxidoreductase activity, acting on other nitrogenous compounds as donors, with NAD or NADP as acceptor Process
| Method | What It Measures | Typical Application |
|---|---|---|
| NAD(P)(H) quantification | Reduced and oxidized pyridine nucleotides | Assessing GO:0046857 flux |
| CRISPR knockout | Gene function loss | Testing NADK, NADK2, NRK1 roles |
| Cryo-EM | Protein structure | NAD kinase regulation |
| Metabolic labeling | Pathway flux | Proline and nucleotide synthesis |
| Proline rescue | Biosynthetic requirement | Mitochondrial NADP(H) function |
| Folate labeling | Nucleotide synthesis | Cytosolic NADK essentiality |
| T cell survival assays | Immune cell fate | NRK1 function |
| Plant genetics | NAD(P)(H) balance | CCR4C in Arabidopsis |
Metabolomics and NAD(P)(H) quantification
Measuring NAD+, NADH, NADP+, and NADPH levels is essential to assess GO:0046857-related activity. Studies of mitochondrial NADP(H) generation and proline biosynthesis used metabolic labeling and quantification. Cytoplasmic NAD/H synthesis via NRK1 was linked to T cell function using similar approaches.
CRISPR knockout and point-mutation screens
CRISPR knockout of NADK, NADK2, NRK1, and CCR4C can test causal roles in NAD(P)(H) balance. Point mutations can dissect catalytic residues and regulatory sites, as shown for NAD kinase structure-function studies.
Structural biology and cryo-EM
Cryo-EM structure determination of human NAD kinase revealed regulatory mechanisms. Such structural approaches help define how GO:0046857-related enzymes bind substrates and cofactors.
Cell-based metabolic rescue and labeling
Proline rescue experiments demonstrated that mitochondrial NADP(H) generation is essential for proline biosynthesis. Folate-dependent nucleotide synthesis was assessed in NADK-deficient cells. These methods link GO:0046857 activity to specific biosynthetic outputs.
How CRISPR Can Be Used to Study GO:0046857 oxidoreductase activity, acting on other nitrogenous compounds as donors, with NAD or NADP as acceptor
Knockout
CRISPR knockout of NADK, NADK2, NRK1, or CCR4C can reveal loss-of-function phenotypes in NAD(P)(H) metabolism. For example, NADK2 knockout impairs mitochondrial NADP(H) generation and proline biosynthesis. NRK1 knockout affects CD4+ T cell survival and inflammatory capacity.
Point Mutation
Point mutations can dissect catalytic residues or regulatory phosphorylation sites in NAD kinase and related enzymes. Such models help distinguish GO:0046857 catalytic activity from scaffolding functions.
Knock-in
Knock-in of tagged or mutant alleles allows tracking of NADK, NADK2, or NRK1 localization and interaction partners. This is useful for studying compartment-specific NAD(P)(H) production.
Overexpression
Overexpression of NADK or NRK1 can increase NADP(H) or NAD(H) pools and test sufficiency in biosynthetic or inflammatory pathways. Overexpression models complement knockout studies to establish causality.
How EDITGENE Supports oxidoreductase activity, acting on other nitrogenous compounds as donors, with NAD or NADP as acceptor Research
Researchers studying oxidoreductase activity, acting on other nitrogenous compounds as donors, with NAD or NADP as acceptor-related genes often need to determine whether a candidate gene is causally involved in NAD(P)(H) metabolism, biosynthesis, or disease. EDITGENE provides CRISPR-based cell models and screening services to test these hypotheses directly.
Contact EDITGENE today to design your custom CRISPR model for oxidoreductase activity, acting on other nitrogenous compounds as donors, with NAD or NADP as acceptor research.
Frequently Asked Questions About oxidoreductase activity, acting on other nitrogenous compounds as donors, with NAD or NADP as acceptor
What is GO:0046857?
GO:0046857 is a molecular function term for oxidoreductase activity acting on other nitrogenous compounds as donors, with NAD or NADP as acceptor.
What does oxidoreductase activity, acting on other nitrogenous compounds as donors, with NAD or NADP as acceptor mean?
It means an enzyme transfers electrons from a nitrogen-containing donor (excluding NH and NH2) to NAD+ or NADP+, producing NADH or NADPH.
What genes are involved in GO:0046857?
Genes include NADK, NADK2, NRK1, and CCR4C, which regulate NAD(P)(H) pools and related redox reactions.
How is GO:0046857 related to NADPH?
The activity reduces NADP+ to NADPH, supplying reducing power for biosynthesis and antioxidant defense.
Why is NAD kinase important for GO:0046857?
NAD kinase produces NADP+, the substrate for NADPH generation, and is a key regulator of NADP(H) pools.
What diseases are linked to GO:0046857-related genes?
Cancer, inflammatory conditions, and mitochondrial metabolic disorders have been linked to NAD(P)(H) dysregulation.
How can CRISPR be used to study GO:0046857?
CRISPR knockout, point mutation, knock-in, and overexpression can test the function of NADK, NADK2, NRK1, and CCR4C.
What methods measure GO:0046857 activity?
NAD(P)(H) quantification, metabolic labeling, and rescue experiments are commonly used.
Is GO:0046857 a molecular function or biological process?
It is a molecular_function term in the Gene Ontology.
What is the role of NRK1 in GO:0046857-related metabolism?
NRK1 supports cytoplasmic NAD/H synthesis, which regulates inflammatory capacity and survival of CD4+ T cells.
Conclusion
GO:0046857 defines a redox catalytic function that connects nitrogenous donors to NAD(P)H production, influencing biosynthesis, immune function, and disease. Key regulators such as NADK, NADK2, NRK1, and CCR4C control the availability of NAD(P)(H) and are experimentally tractable. CRISPR-based models and metabolic methods provide a path to test causality and identify therapeutic opportunities.
References
- 1. Zhu J et al.. 2021. Mitochondrial NADP(H) generation is essential for proline biosynthesis.. Science 372(6545):968-972 PMID: 33888598
- 2. Kim D et al.. 2025. Mitochondrial NADPH fuels mitochondrial fatty acid synthesis and lipoylation to power oxidative metabolism.. Nat Cell Biol 27(5):790-800 PMID: 40258949
- 3. McGuinness ET et al.. 1985. NAD+ kinase--a review.. Int J Biochem 17(1):1-11 PMID: 2987053
- 4. Stavrou V et al.. 2026. Cytoplasmic NAD/H synthesis via NRK1 regulates inflammatory capacity and promotes survival of CD4(+) T cells.. Nat Commun 17(1) PMID: 41639086
- 5. Praharaj PP et al.. 2025. Cryo-EM structure and regulation of human NAD kinase.. Sci Adv 11(4):eads2664 PMID: 39854463
- 6. Akashi K et al.. 2025. Identification of CCR4C as a chloroplast-localized NADP(H) phosphatase regulating NAD(P)(H) balance in Arabidopsis.. Proc Natl Acad Sci U S A 122(42):e2504605122 PMID: 41091769
- 7. Flickinger KM et al.. 2025. Cytosolic NADK is conditionally essential for folate-dependent nucleotide synthesis.. Nat Metab 7(6):1150-1167 PMID: 40316835
- 8. Tedeschi PM et al.. 2016. NAD+ Kinase as a Therapeutic Target in Cancer.. Clin Cancer Res 22(21):5189-5195 PMID: 27582489
