GO:0102757 NADPH phosphatase activity: Mechanism, Genes and Research Methods
Research-grade guide for scientists and biopharma professionals
Key Takeaways
• GO:0102757 (NADPH phosphatase activity) catalyzes the hydrolysis of NADPH to NADH and hydrogenphosphate, directly converting the primary cellular reducing agent into a different redox cofactor.
• The reaction is chemically distinct from NADPH oxidase activity, which transfers electrons to oxygen to produce reactive oxygen species rather than hydrolyzing the phosphate.
• NADPH phosphatase activity is embedded in metabolic networks that include riboneogenesis, one-carbon metabolism, and redox homeostasis, as shown by flux studies in yeast.
• Enzymes that act on NADPH or its close derivatives include pyrimidine reductases and methionine monooxygenases, highlighting the broader family of NAD(P)H-processing catalysts.
• Dysregulation of NADPH-consuming and NADPH-producing pathways is linked to colorectal tumorigenesis and oxidative-stress-related diseases.
• CRISPR knockout, point-mutation, knock-in, and overexpression models are essential to test whether candidate NADPH phosphatase genes are causally involved in these phenotypes.
Description
NADPH phosphatase activity (GO:0102757) is a molecular function defined by the reaction NADPH + H2O = NADH + hydrogenphosphate. This activity sits at the intersection of redox biology and phosphate metabolism because it consumes NADPH, the major electron donor for reductive biosynthesis and antioxidant defense, and produces NADH, a central electron carrier for oxidative phosphorylation. Understanding this activity is therefore important for researchers studying how cells balance reducing equivalents and how metabolic flux is rerouted under stress or during tumorigenesis. The QuickGO definition provides a precise chemical equation, but the biological context comes from studies of NADPH-dependent enzymes and pathways, including riboneogenesis in yeast and NADPH oxidase regulation in mammalian cells. Because NADPH phosphatase activity is not simply the reverse of a kinase reaction, it represents a distinct node that can be targeted with genetic and pharmacological tools. This article summarizes the authoritative definition, the genes and proteins that participate in related NADPH-processing reactions, and the experimental models used to study this function.
NADPH phosphatase activity At A Glance
| GO ID | GO:0102757 |
|---|---|
| GO term | NADPH phosphatase activity |
| Ontology | molecular_function |
| Synonym | none |
| Definition | Catalysis of the reaction: NADPH + H2O = NADH + hydrogenphosphate. |
| Major function | Hydrolytic removal of the 2'-phosphate from NADPH to yield NADH and phosphate. |
| Substrate | NADPH (reduced nicotinamide adenine dinucleotide phosphate) |
| Products | NADH and hydrogenphosphate (inorganic phosphate) |
| Related activity | NADPH oxidase activity, which transfers electrons from NADPH to oxygen |
| Pathway context | Redox cofactor interconversion, riboneogenesis, and one-carbon metabolism |
What Is GO:0102757?
According to the Gene Ontology, NADPH phosphatase activity (GO:0102757) is the catalysis of the reaction NADPH + H2O = NADH + hydrogenphosphate. In other words, the enzyme removes the 2'-phosphate group from NADPH by hydrolysis, converting it to NADH and releasing inorganic phosphate. This is a molecular_function term, meaning it describes what a gene product does at the biochemical level rather than where it acts or what pathway it belongs to. The reaction is distinct from NADPH oxidase activity, which uses NADPH to reduce molecular oxygen and generate reactive oxygen species. It is also distinct from NADP+ phosphatase activity, because the substrate here is the reduced cofactor NADPH. The term does not specify a particular protein family or organism; instead, it captures a catalytic capability that can be annotated to any gene product that performs this chemistry.
Why Is NADPH phosphatase activity Important in Cell Biology?
NADPH phosphatase activity matters because it directly alters the cellular pool of NADPH, a cofactor required for reductive biosynthesis, glutathione recycling, and oxidative stress defense. By converting NADPH to NADH, this activity can shift the balance between biosynthetic reducing power and respiratory electron supply, with consequences for metabolic flux and cell survival. In cancer, NADPH-consuming pathways support tumor growth and antioxidant capacity, and enzymes such as ME1 regulate NADPH homeostasis to affect lipid metabolism and colorectal tumorigenesis. In immune and inflammatory settings, NADPH oxidase activity and its regulation by phosphatases influence reactive oxygen species production and signaling. Therefore, understanding NADPH phosphatase activity provides a mechanistic handle on redox balance, metabolic reprogramming, and disease-associated pathways.
• Controls the interconversion of NADPH and NADH, two central redox cofactors.
• Impacts reductive biosynthesis, including lipid and nucleotide precursor production.
• Modulates oxidative stress defense by altering NADPH availability for antioxidant systems.
• Contributes to metabolic reprogramming in colorectal tumorigenesis through NADPH-dependent enzymes such as ME1.
• Intersects with NADPH oxidase signaling, which is regulated by phosphatase activity.
• Relevant to riboneogenesis and one-carbon metabolism in yeast and likely other organisms.
• Provides a potential target for probing redox homeostasis in immune cells and inflammation.
• Can be studied with CRISPR knockout and point-mutation models to test causality.
• Links to pyrimidine and riboflavin biosynthesis through NAD(P)H-dependent reductases.
• Offers a biochemical node for understanding phosphate and redox crosstalk.
What Happens During NADPH phosphatase activity?
Substrate recognition and binding
In simple terms: The enzyme first grabs NADPH, the reduced form of the cofactor.
NADPH phosphatase activity begins with the binding of NADPH to the active site of the enzyme. NADPH is distinguished from NADH by the presence of a 2'-phosphate group on the adenosine ribose. The enzyme must recognize this phosphate to position the substrate for hydrolysis. Studies of NADPH-dependent enzymes show that substrate specificity is often achieved through dedicated phosphate-binding pockets. In the context of GO:0102757, the binding step ensures that NADPH, rather than NADH or NADP+, is selected for catalysis.
Hydrolytic cleavage of the 2'-phosphate
In simple terms: Water is used to cut off the phosphate group from NADPH.
The catalytic step involves nucleophilic attack by water on the phosphorus atom of the 2'-phosphate, releasing inorganic phosphate (hydrogenphosphate) and converting NADPH to NADH. This is a hydrolysis reaction, not a redox reaction, so the nicotinamide ring remains reduced. The reaction is chemically analogous to other phosphatase activities that remove phosphate monoesters. The QuickGO definition specifies the products as NADH and hydrogenphosphate, which means the enzyme does not generate NADP+.
Product release and cofactor pool changes
In simple terms: The products NADH and phosphate are released, changing the cell's redox balance.
After catalysis, NADH and hydrogenphosphate are released from the active site. The conversion of NADPH to NADH alters the ratio of these two cofactors, which can affect pathways that depend on NADPH, such as glutathione reduction and lipid synthesis, as well as pathways that depend on NADH, such as oxidative phosphorylation. In yeast, flux through NADPH-dependent pathways is tightly connected to riboneogenesis, and changes in cofactor balance can redirect metabolic flux. Thus, the product release step is not merely the end of the reaction but the beginning of a metabolic shift.
Integration with cellular redox networks
In simple terms: The reaction feeds into larger networks that control oxidative stress and biosynthesis.
NADPH phosphatase activity is embedded in redox networks that include NADPH oxidases, which produce reactive oxygen species, and thioredoxin systems, which reduce oxidized proteins. For example, NADPH oxidase activity is regulated by protein phosphatase 2A, and inhibition of prolyl oligopeptidase can reduce oxidative stress via this mechanism. Additionally, thioredoxin 1 reactivates oxidized PTP1B and PTEN, linking NADPH-dependent reducing systems to phosphatase signaling. These connections show that NADPH phosphatase activity can influence multiple redox-sensitive processes beyond its immediate products.
Key Genes Involved in GO:0102757 NADPH phosphatase activity
The following genes and proteins are involved in NADPH-dependent reactions, redox regulation, or related metabolic pathways that provide context for studying NADPH phosphatase activity.
| Gene | Major Role | Research Relevance |
|---|---|---|
| ME1 | Malic enzyme 1, produces NADPH for lipid synthesis and redox balance | Phosphorylation and acetylation of ME1 affect lipid metabolism and colorectal tumorigenesis |
| NOX family | NADPH oxidases generate reactive oxygen species from NADPH | NADPH oxidase activity is a distinct but related NADPH-consuming process |
| PREP | Prolyl oligopeptidase, regulates oxidative stress via phosphatase 2A | Inhibition reduces NADPH oxidase activity and oxidative stress |
| MTO1 | Monooxygenase involved in methionine oxidation | Regulated methionine oxidation by monooxygenases links to NADPH metabolism |
| PYRR | Pyrimidine reductase in plant riboflavin biosynthesis | Uses NAD(P)H and illustrates NADPH-dependent reductase chemistry |
| CD38 | NAD+ glycohydrolase involved in calcium signaling | CD38-mediated NAADP-Ca2+ signaling requires LRRK2 and relates to NADPH metabolism |
| LRRK2 | Leucine-rich repeat kinase 2, regulates immune cell autophagy | Required for CD38-mediated NAADP-Ca2+ signaling and TFEB activation |
| PTP1B | Protein tyrosine phosphatase 1B, redox-regulated | Reactivation by thioredoxin 1 depends on NADPH-dependent reducing systems |
| PTEN | Phosphatase and tensin homolog, redox-regulated tumor suppressor | Reactivation by thioredoxin 1 links NADPH metabolism to tumor suppression |
| TXN | Thioredoxin, reduces oxidized proteins using NADPH | Thioredoxin 1 reactivates oxidized PTP1B and PTEN |
| G6PD | Glucose-6-phosphate dehydrogenase, major NADPH producer | Provides NADPH for reductive biosynthesis and antioxidant defense |
| 6PGD | 6-phosphogluconate dehydrogenase, NADPH producer | Part of the pentose phosphate pathway that supplies NADPH |
| IDH1/2 | Isocitrate dehydrogenases, produce NADPH | Contribute to cellular NADPH pools and redox balance |
| MTHFD1 | Methylenetetrahydrofolate dehydrogenase, NADPH-linked | Connects one-carbon metabolism to NADPH |
| SHMT | Serine hydroxymethyltransferase, links serine metabolism to NADPH | Part of the riboneogenesis and one-carbon network |
| NOX1 | NADPH oxidase 1, produces superoxide | Localization of NADPH oxidase-derived ROS is important for signaling |
| NOX4 | NADPH oxidase 4, produces hydrogen peroxide | Distinct from NADPH phosphatase activity but shares substrate NADPH |
How Is NADPH phosphatase activity Regulated?
NADPH phosphatase activity is likely regulated at multiple levels, although direct evidence for specific regulators of GO:0102757 is limited. Related NADPH-consuming processes are regulated by phosphorylation and acetylation, as shown for ME1, where dynamic modification affects lipid metabolism and tumorigenesis. NADPH oxidase activity, which also consumes NADPH, is regulated by protein phosphatase 2A, and inhibition of prolyl oligopeptidase reduces oxidative stress through this pathway. Additionally, redox-regulated phosphatases such as PTP1B and PTEN are reactivated by thioredoxin 1 in an NADPH-dependent manner, indicating that the NADPH pool itself is under feedback control. These examples suggest that NADPH phosphatase activity may be influenced by cellular redox state, post-translational modifications, and metabolic demand, but further studies are needed to define the precise regulatory mechanisms.
NADPH phosphatase activity and Human Disease
| Gene | Disease / Biology | Potential Experimental Model |
|---|---|---|
| ME1 | Colorectal tumorigenesis and lipid metabolism | Knockout and point-mutation models in colorectal cancer cell lines |
| NOX family | Oxidative stress and inflammation | Overexpression and knockout models to measure ROS production |
| LRRK2 | Immune cell autophagy and NAADP-Ca2+ signaling | Knockout and knock-in models in immune cells |
| PTP1B | Redox regulation and metabolic signaling | Point-mutation models to test redox sensitivity |
| PTEN | Tumor suppression and redox regulation | Knock-in models with tagged PTEN for oxidation studies |
Cancer metabolism and colorectal tumorigenesis
NADPH-dependent enzymes are critical for cancer cell metabolism. ME1, which produces NADPH, is dynamically regulated by phosphorylation and acetylation, and these modifications affect lipid metabolism and colorectal tumorigenesis. Because NADPH phosphatase activity consumes NADPH, it could influence the same pathways by reducing NADPH availability. However, direct evidence linking GO:0102757 to cancer remains to be established, and current understanding is based on the broader network of NADPH-consuming and producing enzymes.
Oxidative stress and inflammatory signaling
NADPH oxidase activity generates reactive oxygen species that contribute to oxidative stress and inflammation. Prolyl oligopeptidase inhibition reduces oxidative stress by activating protein phosphatase 2A and reducing NADPH oxidase activity. Since NADPH phosphatase activity also acts on NADPH, it may indirectly modulate oxidative stress by altering substrate availability for NADPH oxidases. Additionally, LRRK2 is required for CD38-mediated NAADP-Ca2+ signaling and TFEB activation in immune cells, linking NADPH-related metabolism to autophagy and immune function.
Redox regulation of tumor suppressors and phosphatases
Thioredoxin 1 reactivates oxidized PTP1B and PTEN, two phosphatases with roles in cancer and metabolism. This reactivation depends on the NADPH/thioredoxin reducing system, which is closely tied to NADPH availability. Therefore, changes in NADPH phosphatase activity could affect the redox state of these phosphatases and their downstream signaling. However, no direct study has yet demonstrated a causal role for GO:0102757 in these diseases, so this remains a hypothesis for future research.
From NADPH phosphatase activity-Related Genes to Experimental Models
| Research Question | Suitable Model |
|---|---|
| Is the candidate gene essential for NADPH phosphatase activity? | CRISPR knockout cell line |
| Does a specific residue mediate substrate binding? | Point-mutation knock-in |
| Where is the enzyme localized in the cell? | Tagged knock-in (e.g., GFP or HA tag) |
| Does overexpression alter NADPH/NADH ratios? | Overexpression cell model |
| Which pathways depend on the enzyme under stress? | CRISPR knockout followed by RNA-seq or metabolomics |
| Can the enzyme be targeted pharmacologically? | Knockout plus small-molecule inhibitor treatment |
How to Study the NADPH phosphatase activity Process
| Method | What It Measures | Typical Application |
|---|---|---|
| Targeted metabolomics | NADPH, NADH, and phosphate levels | Quantify reaction products in cell lysates |
| Enzymatic cycling assay | NADPH/NADH ratio | Assess redox balance after genetic perturbation |
| CRISPR knockout screen | Gene essentiality under oxidative stress | Identify novel NADPH phosphatases |
| Phosphoproteomics | Phosphorylation of metabolic enzymes | Map regulatory modifications on ME1 and related proteins |
| Acetylome profiling | Acetylation of metabolic enzymes | Study dynamic regulation of NADPH enzymes |
| Fluorescence microscopy | Subcellular localization of tagged proteins | Determine organelle-specific activity |
| RNA-seq | Transcriptional changes after knockout | Identify pathways affected by loss of NADPH phosphatase |
Metabolomics and cofactor measurement
To study NADPH phosphatase activity, researchers can measure NADPH and NADH levels using targeted metabolomics or enzymatic cycling assays. These methods quantify the substrate and product of the reaction and can reveal changes in redox balance. In yeast, flux studies have been used to dissect riboneogenesis and NADPH-dependent pathways. In mammalian cells, similar approaches can be applied to cancer cell lines to test how genetic perturbations affect cofactor pools.
Genetic screens and CRISPR knockout
CRISPR knockout screens can identify genes required for NADPH homeostasis or for resistance to oxidative stress. By comparing wild-type and knockout cells, researchers can determine whether a candidate NADPH phosphatase is essential under specific conditions. This approach is supported by the availability of genome-wide libraries and has been used to study metabolic vulnerabilities in cancer. However, direct screens for GO:0102757 have not been reported, so this is a promising area for future work.
Proteomics and post-translational modification analysis
Proteomic methods can detect phosphorylation and acetylation of NADPH-related enzymes. For example, ME1 phosphorylation and acetylation were shown to affect lipid metabolism and tumorigenesis. Mass spectrometry-based proteomics can be used to identify modifications on candidate NADPH phosphatases and to map interaction partners. These approaches help link the enzyme's activity to signaling pathways.
Imaging and subcellular localization
Fluorescence microscopy with tagged proteins can reveal where NADPH phosphatase activity occurs in the cell. Localization of NADPH oxidase-derived ROS has been studied using imaging techniques. Similar strategies can be applied to candidate NADPH phosphatases by tagging them with fluorescent proteins and co-staining with organelle markers. This provides spatial context for the reaction.
How CRISPR Can Be Used to Study GO:0102757 NADPH phosphatase activity
Knockout
CRISPR knockout of a candidate NADPH phosphatase gene can abolish its activity and reveal its contribution to NADPH/NADH balance. By comparing knockout and wild-type cells, researchers can measure changes in cofactor levels, oxidative stress sensitivity, and metabolic flux. This approach is widely used to study metabolic enzymes such as ME1. For GO:0102757, knockout models would help determine whether the enzyme is essential under normal or stress conditions.
Point Mutation
Point mutations can be introduced into the active site of a candidate NADPH phosphatase to test which residues are required for catalysis. For example, mutating a predicted phosphate-binding residue can distinguish substrate binding from catalysis. Similar strategies have been used to study redox-regulated phosphatases such as PTP1B and PTEN. These models provide mechanistic insight into the enzyme's function.
Knock-in
Knock-in of a tagged version of the enzyme (e.g., GFP or HA) allows for localization and interaction studies. Tagged knock-in models can also be used to immunoprecipitate the enzyme and identify binding partners. This approach is valuable for understanding where NADPH phosphatase activity occurs and how it is regulated. It complements knockout and point-mutation studies.
Overexpression
Overexpression of a candidate NADPH phosphatase can increase its activity and drive changes in NADPH/NADH ratios. This can be used to test whether excess activity is sufficient to alter redox balance, lipid metabolism, or cell proliferation. Overexpression models are particularly useful for studying gain-of-function effects and for validating drug targets. They can be combined with metabolomics to measure flux changes.
How EDITGENE Supports NADPH phosphatase activity Research
Researchers studying NADPH phosphatase activity-related genes often need to determine whether a candidate gene is causally involved in redox regulation, metabolic reprogramming, or disease phenotypes. This requires precise genetic models that can knockout, mutate, tag, or overexpress the gene of interest in relevant cell types. EDITGENE provides a comprehensive suite of CRISPR services to support these studies, from single-gene knockout to genome-wide library screening.
Contact EDITGENE today to design your custom CRISPR model for NADPH phosphatase activity research.
Frequently Asked Questions About NADPH phosphatase activity
What is NADPH phosphatase activity?
NADPH phosphatase activity (GO:0102757) is a molecular function that catalyzes the reaction NADPH + H2O = NADH + hydrogenphosphate, removing the 2'-phosphate from NADPH to produce NADH and inorganic phosphate.
What genes are involved in NADPH phosphatase activity?
No specific gene has been definitively assigned to GO:0102757 in the provided literature, but related NADPH-dependent enzymes include ME1, NOX family members, and pyrimidine reductases.
How is NADPH phosphatase activity different from NADPH oxidase activity?
NADPH oxidase activity transfers electrons from NADPH to oxygen to produce reactive oxygen species, whereas NADPH phosphatase activity hydrolyzes the phosphate group of NADPH to yield NADH and phosphate.
What is the reaction catalyzed by NADPH phosphatase?
The reaction is NADPH + H2O = NADH + hydrogenphosphate, as defined by the Gene Ontology.
Why is NADPH phosphatase activity important in cancer?
It may influence NADPH availability for reductive biosynthesis and antioxidant defense, pathways that are critical in cancer metabolism, as shown for ME1 in colorectal tumorigenesis.
How can I study NADPH phosphatase activity in the lab?
You can use metabolomics to measure NADPH/NADH ratios, CRISPR knockout to test gene function, and proteomics to detect post-translational modifications.
What model systems are used to study NADPH phosphatase activity?
Yeast is a powerful model for riboneogenesis and NADPH flux, while mammalian cell lines are used for cancer and redox studies.
Is NADPH phosphatase activity related to oxidative stress?
Yes, by consuming NADPH, it can affect the reducing power available to antioxidant systems, and related pathways are linked to oxidative stress regulation.
What are the products of NADPH phosphatase activity?
The products are NADH and hydrogenphosphate (inorganic phosphate).
Can CRISPR be used to study NADPH phosphatase activity?
Yes, CRISPR knockout, point mutation, knock-in, and overexpression models can be used to test the function of candidate genes in NADPH metabolism.
Conclusion
NADPH phosphatase activity (GO:0102757) is a distinct molecular function that converts NADPH to NADH and phosphate, thereby influencing cellular redox balance and metabolic flux. Although direct studies of this specific activity are limited, the surrounding literature on NADPH-dependent enzymes, including ME1, NADPH oxidases, and thioredoxin systems, provides a strong foundation for understanding its potential roles in cancer, oxidative stress, and immune signaling. Researchers can leverage CRISPR-based models to test causality and to identify the genes responsible for this activity. As the field advances, precise genetic tools will be essential to unravel the physiological and pathological significance of NADPH phosphatase activity.
References
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- 5. Nabar NR et al.. 2022. LRRK2 is required for CD38-mediated NAADP-Ca(2+) signaling and the downstream activation of TFEB (transcription factor EB) in immune cells.. Autophagy 18(1):204-222 PMID: 34313548
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