GO:0080042 ADP-glucose pyrophosphatase activity: Mechanism, Genes and Research Methods
Research-grade guide for scientists and biopharma professionals
Key Takeaways
• GO:0080042 (ADP-glucose pyrophosphatase activity) catalyzes the hydrolysis of ADP-glucose to AMP and glucose-1-phosphate, a reaction that helps regulate cellular levels of ADP-glucose and pyrophosphate.
• The enzyme belongs to the Nudix hydrolase superfamily and acts on ADP-sugar substrates, with homologs found in bacteria, archaea, and eukaryotes [3,4,7].
• ADP-glucose pyrophosphatase activity is linked to pyrophosphate metabolism, which is critical for energy homeostasis and thermogenesis in mammals.
• In bacteria such as Escherichia coli, ADP-sugar pyrophosphatase (NudE) binds to membranes in response to cell density signals, suggesting a role in stress adaptation.
• Dysregulation of ADP-sugar hydrolases has been implicated in metabolic disorders and cancer, making this activity a potential therapeutic target [2,5].
• CRISPR-based knockout, knock-in, and overexpression models are essential to dissect the physiological roles of genes encoding ADP-glucose pyrophosphatase activity [1,2].
Description
ADP-glucose pyrophosphatase activity (GO:0080042) is a molecular function that catalyzes the hydrolysis of ADP-glucose into AMP and glucose-1-phosphate. This reaction is part of the broader family of Nudix hydrolase activities that cleanse cells of potentially harmful nucleotide-sugar metabolites and regulate pyrophosphate (PPi) pools [3,4]. The enzyme is widely distributed across prokaryotes and eukaryotes, and its activity has been detected in organisms ranging from Clostridium thermocellum to humans [1,5]. Researchers study this activity because it sits at the intersection of carbohydrate metabolism, nucleotide homeostasis, and stress responses [2,7]. In Clostridium thermocellum, ADP-glucose synthase and pyrophosphate sources are critical for cellulose degradation and biofuel production, highlighting the biotechnological relevance of this activity. In mammals, hepatic ENTPD5, which generates PPi and influences ADP-glucose pyrophosphatase activity indirectly, is essential for metabolic homeostasis and brown adipose tissue thermogenesis. Thus, understanding GO:0080042 provides insights into fundamental metabolic regulation and potential disease interventions.
ADP-glucose pyrophosphatase activity At A Glance
| GO ID | GO:0080042 |
|---|---|
| GO term | ADP-glucose pyrophosphatase activity |
| Ontology | molecular_function |
| Synonym | ADP-glucose pyrophosphohydrolase activity |
| Major function | Catalyzes the hydrolysis of ADP-glucose to AMP and glucose-1-phosphate |
| Reaction | ADP-glucose + H2O = AMP + glucose-1-phosphate |
| Enzyme family | Nudix hydrolase superfamily (ADP-sugar pyrophosphatases) |
| Subcellular location | Cytoplasm; membrane-associated under certain conditions |
| Organisms | Bacteria, archaea, and eukaryotes including humans [1,3,5] |
What Is GO:0080042?
According to the Gene Ontology, GO:0080042 (ADP-glucose pyrophosphatase activity) is defined as the catalysis of the reaction: ADP-glucose + H2O = AMP + glucose-1-phosphate. This activity is synonymous with ADP-glucose pyrophosphohydrolase activity and belongs to the molecular_function ontology aspect. It is a type of pyrophosphatase that specifically targets ADP-glucose, releasing AMP and glucose-1-phosphate, thereby regulating the cellular levels of these metabolites and influencing pyrophosphate metabolism [1,3].
Why Is ADP-glucose pyrophosphatase activity Important in Cell Biology?
ADP-glucose pyrophosphatase activity is important because it regulates the intracellular levels of ADP-glucose, a key intermediate in starch and glycogen biosynthesis, and controls pyrophosphate (PPi) homeostasis [1,2]. By hydrolyzing ADP-glucose, this enzyme prevents the accumulation of this metabolite, which can be toxic at high concentrations. In bacteria, it contributes to stress tolerance and membrane adaptation. In mammals, related Nudix hydrolases influence metabolic pathways and thermogenesis, and their dysfunction has been linked to metabolic disorders and cancer [2,5]. Therefore, studying GO:0080042 is essential for understanding energy metabolism, stress responses, and disease mechanisms.
• Regulates ADP-glucose levels, impacting starch and glycogen synthesis.
• Controls pyrophosphate (PPi) pools, which are critical for energy metabolism.
• Contributes to abiotic stress tolerance in bacteria.
• Plays a role in membrane adaptation in response to cell density signals.
• Involved in NAD+ metabolism and thermal degradation in hyperthermophiles.
• Dysregulation may contribute to metabolic disorders such as obesity and diabetes.
• Potential target for cancer therapy due to altered nucleotide metabolism.
• Biotechnological relevance in biofuel production from cellulose.
• Provides a model for studying Nudix hydrolase family evolution and function.
• Enables CRISPR-based functional genomics to dissect metabolic networks [1,2].
Molecular Mechanism of ADP-glucose pyrophosphatase activity
Substrate Recognition and Binding
In simple terms: The enzyme grabs ADP-glucose and holds it in place to break it apart.
ADP-glucose pyrophosphatase specifically binds ADP-glucose, a nucleotide-sugar composed of adenine, ribose, and glucose linked via a pyrophosphate bond. The enzyme's active site recognizes the ADP moiety and the glucose ring, positioning the pyrophosphate bond for hydrolysis. In Escherichia coli, the ADP-sugar pyrophosphatase NudE exhibits high specificity for ADP-glucose and ADP-ribose, with structural studies revealing a conserved Nudix fold that accommodates these substrates. The binding is facilitated by divalent metal ions, typically Mg2+ or Mn2+, which coordinate the phosphate groups and stabilize the transition state.
Catalytic Hydrolysis
In simple terms: Water is used to split ADP-glucose into AMP and glucose-1-phosphate.
The catalytic mechanism involves the nucleophilic attack of a water molecule on the pyrophosphate bond of ADP-glucose, resulting in the release of AMP and glucose-1-phosphate. This hydrolysis reaction is energetically favorable and is driven by the cleavage of the high-energy phosphoanhydride bond. The reaction is dependent on divalent cations, which activate the water molecule and stabilize the leaving group. In Clostridium thermocellum, ADP-glucose pyrophosphatase activity contributes to pyrophosphate production, which is essential for cellulose degradation.
Cofactors and Metal Ion Requirement
In simple terms: The enzyme needs metal helpers like magnesium to work.
ADP-glucose pyrophosphatase activity requires divalent metal ions such as Mg2+ or Mn2+ for catalysis. These ions are coordinated by conserved glutamate and aspartate residues in the active site, and they facilitate the orientation of the substrate and the water molecule. In the absence of metal ions, the enzyme exhibits negligible activity. The metal ion dependence is a hallmark of Nudix hydrolases, which use a common catalytic motif.
Regulation by Cellular Signals
In simple terms: The enzyme can be turned on or off by signals from the cell.
ADP-glucose pyrophosphatase activity is regulated by cellular signals, including extracellular cues that trigger membrane binding. In Escherichia coli, the enzyme binds to cell membranes as cell population density increases, suggesting a role in quorum sensing or stress response. Additionally, the activity can be modulated by the availability of substrates and metal ions, as well as by post-translational modifications. In mammals, hepatic ENTPD5 indirectly influences ADP-glucose pyrophosphatase activity by regulating pyrophosphate levels, which are critical for metabolic homeostasis.
Physiological Role in Pyrophosphate Metabolism
In simple terms: The enzyme helps control the amount of pyrophosphate in cells.
By hydrolyzing ADP-glucose, the enzyme produces AMP and glucose-1-phosphate, and it also contributes to the regulation of pyrophosphate (PPi) pools. PPi is a byproduct of many biosynthetic reactions and must be kept at low concentrations to drive metabolic pathways forward. In Clostridium thermocellum, pyrophosphate generated by ADP-glucose pyrophosphatase is used by pyruvate phosphate dikinase and membrane-bound pyrophosphatase for energy conservation. In mammals, ENTPD5 hydrolyzes UDP-glucose to generate PPi, which is then used for protein folding in the endoplasmic reticulum, linking this activity to metabolic homeostasis.
Key Genes Involved in GO:0080042 ADP-glucose pyrophosphatase activity
The following genes and proteins are directly or indirectly associated with ADP-glucose pyrophosphatase activity (GO:0080042), based on published literature.
| Gene | Major Role | Research Relevance |
|---|---|---|
| NudE (E. coli) | ADP-sugar pyrophosphatase that hydrolyzes ADP-glucose and ADP-ribose | Model for studying substrate specificity and membrane binding |
| Nudt14 (mouse) | UDP-glucose pyrophosphatase, a Nudix hydrolase | Homolog of ADP-glucose pyrophosphatase; links to metabolic disorders |
| ENTPD5 (human) | Endoplasmic reticulum UDPase that generates pyrophosphate | Regulates metabolic homeostasis and thermogenesis |
| Alr2954 (Anabaena) | ADP-ribose pyrophosphatase with stress tolerance function | Provides insights into abiotic stress adaptation |
| ADP-sugar pyrophosphatase (human placenta) | Hydrolyzes ADP-ribose and ADP-glucose | Enzyme purification and characterization |
| H+-PPase (C. thermocellum) | Membrane-bound pyrophosphatase that consumes PPi | Pyrophosphate source for cellulose degradation |
| ADP-glucose synthase (C. thermocellum) | Synthesizes ADP-glucose, substrate for pyrophosphatase | Pyrophosphate metabolism in biofuel production |
| Pyruvate phosphate dikinase (C. thermocellum) | Generates PPi from pyruvate | Energy metabolism in thermophiles |
| Ureaplasma urealyticum pyrophosphatase | Inorganic pyrophosphatase activity | Comparative studies of pyrophosphate metabolism |
| Thermococcus kodakarensis Nudix hydrolases | Deal with NAD+ thermal degradation | Thermostable enzyme mechanisms |
| Nudix hydrolase family (general) | Diverse substrates including ADP-sugars | Evolutionary and functional studies [3,4] |
| ADP-ribose pyrophosphatase (human) | Specific for ADP-ribose | Substrate specificity and disease links |
| Nudt14 (human) | UDP-glucose pyrophosphatase | Metabolic regulation and potential drug target |
| ENTPD5 (mouse) | UDPase in ER | Brown adipose tissue thermogenesis |
| Alr2954 (E. coli expression) | Confers stress tolerance | Biotechnological applications |
| NudE (E. coli) membrane-bound form | Membrane-associated under high cell density | Quorum sensing and stress response |
| ADP-glucose pyrophosphatase (plant homologs) | Regulates starch synthesis | Crop improvement |
| Pyrophosphatase (Ureaplasma) | Inorganic PPi hydrolysis | Minimal genome studies |
How Is ADP-glucose pyrophosphatase activity Regulated?
ADP-glucose pyrophosphatase activity is regulated at multiple levels. In Escherichia coli, the enzyme NudE binds to cell membranes in response to extracellular signals as cell population density increases, suggesting regulation by quorum sensing or stress pathways. The activity is also dependent on divalent metal ions such as Mg2+ and Mn2+, which are required for catalysis. In mammals, hepatic ENTPD5, which generates pyrophosphate, is regulated by metabolic status and influences brown adipose tissue thermogenesis, indirectly affecting ADP-glucose pyrophosphatase activity. Additionally, substrate availability and post-translational modifications may modulate enzyme activity.
ADP-glucose pyrophosphatase activity and Human Disease
| Gene | Disease / Biology | Potential Experimental Model |
|---|---|---|
| ENTPD5 | Metabolic disorders, obesity, impaired thermogenesis | Liver-specific knockout mouse |
| Nudt14 | Cancer, metabolic reprogramming | Cancer cell line knockout |
| ADP-sugar pyrophosphatase (human) | Cancer, placental disorders | Overexpression in HeLa cells |
| Alr2954 | Stress tolerance, bacterial survival | E. coli heterologous expression |
| NudE | Biofilm formation, quorum sensing | E. coli membrane binding assays |
Metabolic Disorders and Obesity
Hepatic ENTPD5, which is critical for maintaining metabolic homeostasis and promoting brown adipose tissue thermogenesis, is linked to energy balance. Dysregulation of pyrophosphate metabolism, in which ADP-glucose pyrophosphatase activity participates, may contribute to obesity and insulin resistance. Mouse models with altered ENTPD5 expression show defects in thermogenesis and metabolic rate, highlighting the importance of this pathway in metabolic diseases.
Cancer and Nucleotide Metabolism
Altered nucleotide-sugar metabolism is a hallmark of cancer. Human placenta hydrolases active on free ADP-ribose, including ADP-sugar pyrophosphatases, have been implicated in tumor progression. The Nudix hydrolase Nudt14, which hydrolyzes UDP-glucose, is overexpressed in some cancers and may support the high metabolic demands of tumor cells. Targeting ADP-glucose pyrophosphatase activity could therefore be a therapeutic strategy.
Stress Tolerance and Infectious Diseases
In bacteria such as Anabaena sp. PCC 7120, the ADP-ribose pyrophosphatase Alr2954 confers abiotic stress tolerance, suggesting a role in survival under harsh conditions. In Ureaplasma urealyticum, inorganic pyrophosphatase activity is present, and these enzymes may be important for pathogenicity. Understanding these activities could lead to new antimicrobial strategies [3,6].
From ADP-glucose pyrophosphatase activity-Related Genes to Experimental Models
| Research Question | Suitable Model |
|---|---|
| What is the catalytic mechanism of ADP-glucose hydrolysis? | Point mutations in NudE active site residues |
| How does ADP-glucose pyrophosphatase affect starch synthesis? | Knockout of ADP-glucose pyrophosphatase in plants |
| Does ENTPD5 regulate thermogenesis? | Liver-specific ENTPD5 knockout mouse |
| Can Alr2954 confer stress tolerance? | Overexpression in E. coli |
| How is NudE localized during quorum sensing? | Tagged knock-in of NudE with GFP |
| What is the role of Nudt14 in cancer metabolism? | CRISPR knockout in cancer cell lines |
How to Study the ADP-glucose pyrophosphatase activity Process
| Method | What It Measures | Typical Application |
|---|---|---|
| Coupled enzyme assay | ADP-glucose hydrolysis rate | Enzyme kinetics |
| Radioactive substrate assay | Enzyme activity in cell extracts | Tissue distribution |
| CRISPR knockout screen | Gene essentiality and fitness | Cancer metabolism |
| AP-MS | Protein-protein interactions | Regulatory complex identification |
| BioID | Proximity-dependent biotinylation | Membrane interactome |
| LC-MS metabolomics | Metabolite levels | Pathway flux |
| Isotope tracing | Metabolic flux | Pyrophosphate metabolism |
| Western blot | Protein expression | Knockout validation |
Enzymatic Activity Assays
ADP-glucose pyrophosphatase activity can be measured using coupled enzyme assays that detect the release of AMP or glucose-1-phosphate. For example, the hydrolysis of ADP-glucose can be monitored spectrophotometrically by coupling to NADH oxidation. Radioactive substrate assays using [32P]ADP-glucose are also used to quantify activity in cell extracts. These methods are essential for characterizing enzyme kinetics and substrate specificity.
CRISPR-Cas9 Knockout Screening
CRISPR-Cas9 knockout screens can identify genes required for ADP-glucose pyrophosphatase activity and its downstream effects. Libraries targeting Nudix hydrolase genes can be introduced into cells, followed by selection under stress conditions to identify essential genes. This approach has been used to study metabolic vulnerabilities in cancer cells.
Proteomics and Interactomics
Affinity purification coupled with mass spectrometry (AP-MS) can identify proteins that interact with ADP-glucose pyrophosphatase, revealing regulatory complexes. Proximity labeling techniques such as BioID can map the interactome in live cells, providing insights into membrane association and signaling.
Metabolomics and Flux Analysis
Metabolomic profiling by liquid chromatography-mass spectrometry (LC-MS) can quantify ADP-glucose, AMP, and glucose-1-phosphate levels in cells with altered enzyme activity. Isotope tracing can measure flux through pyrophosphate-dependent pathways, linking enzyme activity to central carbon metabolism.
How CRISPR Can Be Used to Study GO:0080042 ADP-glucose pyrophosphatase activity
Knockout
CRISPR-Cas9 knockout of genes encoding ADP-glucose pyrophosphatase activity, such as NudE or Nudt14, can reveal their physiological roles. For example, knockout of ENTPD5 in mouse liver impairs thermogenesis and metabolic homeostasis. In bacteria, knockout of Alr2954 reduces stress tolerance. These models are valuable for studying loss-of-function phenotypes.
Point Mutation
Point mutations in catalytic residues of ADP-glucose pyrophosphatase can dissect the mechanism. For instance, mutating the Nudix motif glutamate to glutamine abolishes hydrolase activity. Such knock-in models allow precise structure-function studies without altering protein levels.
Knock-in
Knock-in of tagged versions (e.g., GFP or FLAG) of ADP-glucose pyrophosphatase genes enables live-cell imaging and proteomics. Tagged NudE in E. coli has been used to track membrane localization during quorum sensing. Knock-in of disease-associated variants can model human disorders.
Overexpression
Overexpression of ADP-glucose pyrophosphatase genes can test gain-of-function effects. Overexpressing Alr2954 in E. coli enhances abiotic stress tolerance. In mammalian cells, overexpression of Nudt14 alters UDP-glucose levels and metabolic flux. These models are useful for drug screening and pathway analysis.
How EDITGENE Supports ADP-glucose pyrophosphatase activity Research
Researchers studying ADP-glucose pyrophosphatase activity-related genes often need to determine whether a candidate gene is causally involved in metabolic regulation, stress responses, or disease. EDITGENE provides comprehensive CRISPR services to generate precisely engineered cell models, enabling functional validation and mechanistic studies.
Contact EDITGENE today to design your custom CRISPR model for ADP-glucose pyrophosphatase activity research.
Frequently Asked Questions About ADP-glucose pyrophosphatase activity
What is ADP-glucose pyrophosphatase activity?
ADP-glucose pyrophosphatase activity (GO:0080042) is a molecular function that catalyzes the hydrolysis of ADP-glucose to AMP and glucose-1-phosphate, regulating pyrophosphate metabolism.
What genes are involved in ADP-glucose pyrophosphatase activity?
Genes include NudE in E. coli, Nudt14 in mouse, ENTPD5 in human, and Alr2954 in Anabaena, among others [2,3,4,7].
What is the reaction catalyzed by ADP-glucose pyrophosphatase?
The reaction is: ADP-glucose + H2O = AMP + glucose-1-phosphate.
How is ADP-glucose pyrophosphatase activity regulated?
It is regulated by divalent metal ions, substrate availability, and cellular signals such as quorum sensing in bacteria [4,7].
What diseases are associated with ADP-glucose pyrophosphatase dysfunction?
Dysfunction is linked to metabolic disorders, obesity, cancer, and impaired stress tolerance [2,4,5].
What model organisms are used to study ADP-glucose pyrophosphatase?
Escherichia coli, Clostridium thermocellum, Anabaena sp. PCC 7120, mouse, and human cell lines are commonly used [1,2,3,4].
How can CRISPR be used to study ADP-glucose pyrophosphatase activity?
CRISPR knockout, knock-in, point mutation, and overexpression models allow functional dissection of genes encoding this activity [2,7].
What methods measure ADP-glucose pyrophosphatase activity?
Coupled enzyme assays, radioactive substrate assays, and LC-MS metabolomics are standard methods [1,4].
Is ADP-glucose pyrophosphatase activity important for biofuel production?
Yes, in Clostridium thermocellum, it contributes to pyrophosphate metabolism essential for cellulose degradation and biofuel production.
What is the difference between ADP-glucose pyrophosphatase and UDP-glucose pyrophosphatase?
ADP-glucose pyrophosphatase hydrolyzes ADP-glucose, while UDP-glucose pyrophosphatase acts on UDP-glucose; both are Nudix hydrolases but have different substrate specificities [4,7].
Conclusion
ADP-glucose pyrophosphatase activity (GO:0080042) is a critical molecular function that regulates ADP-glucose and pyrophosphate levels, impacting carbohydrate metabolism, stress responses, and energy homeostasis. Its roles in metabolic disorders, cancer, and microbial physiology make it a compelling target for basic and translational research. By leveraging CRISPR-based models and advanced omics, researchers can uncover new therapeutic opportunities and biotechnological applications.
References
- 1. Kuil T et al.. 2022. Functional Analysis of H(+)-Pumping Membrane-Bound Pyrophosphatase, ADP-Glucose Synthase, and Pyruvate Phosphate Dikinase as Pyrophosphate Sources in Clostridium thermocellum.. Appl Environ Microbiol 88(4):e0185721 PMID: 34936842
- 2. Ma R et al.. 2025. Hepatic ENTPD5 Is Critical for Maintaining Metabolic Homeostasis and Promoting Brown Adipose Tissue Thermogenesis.. Adv Sci (Weinh) 12(40):e03603 PMID: 40788055
- 3. Singh PK et al.. 2017. Alr2954 of Anabaena sp. PCC 7120 with ADP-ribose pyrophosphatase activity bestows abiotic stress tolerance in Escherichia coli.. Funct Integr Genomics 17(1):39-52 PMID: 27778111
- 4. Heyen CA et al.. 2009. Characterization of mouse UDP-glucose pyrophosphatase, a Nudix hydrolase encoded by the Nudt14 gene.. Biochem Biophys Res Commun 390(4):1414-8 PMID: 19896456
- 5. Ribeiro JM et al.. 2001. Human placenta hydrolases active on free ADP-ribose: an ADP-sugar pyrophosphatase and a specific ADP-ribose pyrophosphatase.. Biochim Biophys Acta 1526(1):86-94 PMID: 11287126
- 6. Davis JW Jr et al.. 1987. Inorganic pyrophosphatase activity in cell-free extracts of Ureaplasma urealyticum.. J Gen Microbiol 133(6):1453-9 PMID: 2822838
- 7. Morán-Zorzano MT et al.. 2008. Cytoplasmic Escherichia coli ADP sugar pyrophosphatase binds to cell membranes in response to extracellular signals as the cell population density increases.. FEMS Microbiol Lett 288(1):25-32 PMID: 18778276
- 8. Hachisuka SI et al.. 2017. Metabolism Dealing with Thermal Degradation of NAD(+) in the Hyperthermophilic Archaeon Thermococcus kodakarensis.. J Bacteriol 199(19) PMID: 28652302
