GO:0008796 bis(5'-nucleosyl)-tetraphosphatase activity: Mechanism, Genes and Research Methods
Research-grade guide for scientists and biopharma professionals
Key Takeaways
• GO:0008796 describes the molecular function of hydrolyzing P(1),P(4)-bis(5'-nucleosyl)tetraphosphate into two nucleotides, a reaction that controls dinucleoside polyphosphate pools.
• The enzyme is also known as asymmetrical dinucleoside tetraphosphatase and has been purified and characterized from rat tissues, Drosophila melanogaster, human blood cells, higher plants, and Escherichia coli.
• Substrate specificity studies show that the enzyme prefers dinucleoside tetraphosphates such as diadenosine tetraphosphate (Ap4A) and bis(5'-guanosyl) tetraphosphate (Gp4G), while 2',3'-dideoxynucleoside tetraphosphates behave differently from their NTP and Np4N counterparts.
• The activity is developmentally regulated in Drosophila embryos, indicating a role in developmental transitions.
• Loss or dysregulation of dinucleoside tetraphosphatase activity can alter nucleotide signaling and has been linked to cellular stress responses and disease-relevant pathways.
• CRISPR-based knockout, point-mutation, knock-in, and overexpression models enable causal testing of GO:0008796-related genes in human cell lines and animal models.
Description
GO:0008796, bis(5'-nucleosyl)-tetraphosphatase activity, is a molecular function that catalyzes the hydrolysis of P(1),P(4)-bis(5'-nucleosyl)tetraphosphate into two nucleotides. This activity controls the intracellular concentration of dinucleoside polyphosphates, which are signaling molecules implicated in stress responses, cell proliferation, and developmental regulation. The enzyme has been studied for decades, with early purification from rat tissues and later characterization in Drosophila, human blood cells, plants, and bacteria. Researchers care about this activity because dinucleoside tetraphosphates such as diadenosine tetraphosphate (Ap4A) and bis(5'-guanosyl) tetraphosphate (Gp4G) participate in diverse cellular processes, and their hydrolysis by bis(5'-nucleosyl)-tetraphosphatase is a key regulatory step. The enzyme's substrate specificity and kinetic properties have been defined using purified preparations and comparative studies with related phosphodiesterases. Understanding GO:0008796 is relevant for gene function annotation, metabolic pathway reconstruction, and drug discovery targeting nucleotide signaling. The availability of CRISPR tools now allows precise perturbation of genes encoding this activity, enabling causal studies in human cells and model organisms.
bis(5'-nucleosyl)-tetraphosphatase activity At A Glance
| GO ID | GO:0008796 |
|---|---|
| GO term | bis(5'-nucleosyl)-tetraphosphatase activity |
| Ontology | molecular_function |
| Synonym | None listed in QuickGO |
| Major function | Hydrolysis of P(1),P(4)-bis(5'-nucleosyl)tetraphosphate into two nucleotides |
| Substrates | Dinucleoside tetraphosphates such as Ap4A and Gp4G |
| Enzyme class | Hydrolase acting on phosphoric diester bonds |
| Tissue distribution | Detected in rat tissues, Drosophila embryos, human blood cells, and plants |
| Developmental role | Developmentally regulated in Drosophila embryos |
What Is GO:0008796?
In simple terms, GO:0008796 describes an enzyme activity that cuts a specific type of molecule containing two nucleosides joined by four phosphates, splitting it into two separate nucleotides. The official definition is: Catalysis of the hydrolysis of P(1),P(4)-bis(5'-nucleosyl)tetraphosphate into two nucleotides. This activity is also referred to as asymmetrical dinucleoside tetraphosphatase, reflecting its ability to cleave asymmetrically at the tetraphosphate linkage.
Why Is bis(5'-nucleosyl)-tetraphosphatase activity Important in Cell Biology?
GO:0008796 is important because it governs the catabolism of dinucleoside polyphosphates, which are conserved signaling molecules involved in cellular stress responses, proliferation, and development. By controlling the levels of Ap4A and related compounds, this activity influences nucleotide homeostasis and downstream signaling pathways. Its presence across bacteria, plants, insects, and mammals underscores its fundamental biological role.
• Regulates intracellular levels of dinucleoside tetraphosphates such as Ap4A and Gp4G.
• Participates in stress response pathways triggered by heat shock, oxidative stress, and other insults.
• Shows developmental regulation in Drosophila embryos, suggesting roles in embryogenesis.
• Provides a metabolic counterbalance to dinucleoside polyphosphate synthetases.
• Enzyme activity is conserved from bacteria to humans, making it a model for evolutionary studies.
• Altered activity may affect nucleotide pools and impact cell proliferation.
• Substrate specificity studies inform drug design targeting nucleotide hydrolases.
• Human blood cell enzyme is recognized by anti-rat tetraphosphatase antibodies, indicating structural conservation.
• Plant enzymes hydrolyzing ApppA and AppppA highlight roles in plant nucleotide metabolism.
• CRISPR models enable functional dissection of genes encoding this activity in disease contexts.
What Happens During bis(5'-nucleosyl)-tetraphosphatase activity?
Substrate recognition and binding
In simple terms: The enzyme first grabs the target molecule, a dinucleoside tetraphosphate, in a way that positions the phosphate chain for cleavage.
Bis(5'-nucleosyl)-tetraphosphatase binds dinucleoside tetraphosphates such as Ap4A and Gp4G with high affinity, as demonstrated by purification and kinetic studies from rat tissues and Drosophila. The enzyme recognizes the tetraphosphate backbone and the two nucleoside moieties, with specificity influenced by the nature of the bases.
Hydrolysis of the tetraphosphate linkage
In simple terms: The enzyme cuts the phosphate chain, breaking the molecule into two separate nucleotides.
The catalytic step involves hydrolysis of the P(1),P(4)-bis(5'-nucleosyl)tetraphosphate into two nucleotides, as defined by GO:0008796. This asymmetrical cleavage has been characterized using purified enzyme preparations from rat liver and human blood cells. The reaction products are two nucleoside monophosphates or related nucleotides, depending on the substrate.
Substrate specificity and kinetics
In simple terms: The enzyme prefers certain dinucleoside tetraphosphates over others, and its speed depends on the substrate.
Comparative studies show that the enzyme hydrolyzes Ap4A and Gp4G efficiently, while 2',3'-dideoxynucleoside tetraphosphates behave differently from their NTP and Np4N counterparts. Two low Km hydrolytic activities on dinucleoside tetraphosphates were identified in rat liver, one being the specific dinucleoside tetraphosphatase and the other a phosphodiesterase I-like enzyme. Plant enzymes hydrolyzing ApppA and AppppA further illustrate substrate diversity.
Developmental and tissue regulation
In simple terms: The amount and activity of this enzyme change with development and differ between tissues.
In Drosophila embryos, diadenosine tetraphosphatase activity is developmentally regulated, with changes in activity levels during embryogenesis. In rat tissues, bis(5'-guanosyl) tetraphosphatase activity varies among organs. Human blood cells contain a high specific activity enzyme recognized by an anti-rat tetraphosphatase antibody, indicating tissue-specific expression.
Key Genes Involved in GO:0008796 bis(5'-nucleosyl)-tetraphosphatase activity
The following genes and proteins are associated with bis(5'-nucleosyl)-tetraphosphatase activity or its substrates, based on published biochemical and genetic studies.
| Gene | Major Role | Research Relevance |
|---|---|---|
| Drosophila bis(5'-nucleosyl)-tetraphosphatase (asymmetrical) | Encodes an asymmetrical dinucleoside tetraphosphatase in Drosophila melanogaster | Model for developmental regulation and enzyme characterization |
| Rat bis(5'-guanosyl) tetraphosphatase | Hydrolyzes Gp4G in rat tissues | Tissue distribution and kinetic studies |
| Rat liver dinucleoside tetraphosphatase | Specific low Km enzyme hydrolyzing dinucleoside tetraphosphates | Distinguishes specific enzyme from phosphodiesterase I-like activity |
| E. coli diadenosine tetraphosphate pyrophosphohydrolase | Bacterial enzyme hydrolyzing Ap4A | Genetic and molecular cloning studies |
| Lupinus luteus diadenosine tetraphosphatase | Plant enzyme hydrolyzing ApppA and AppppA | Plant nucleotide metabolism |
| Human blood cell dinucleoside tetraphosphatase | High specific activity enzyme in human blood cells | Human enzyme purification and immunological cross-reactivity |
| Firefly luciferase (as tool) | Used to study ddNTP and ddNp4ddN as substrates | Substrate specificity comparisons |
| Phosphodiesterase I-like enzyme | Low Km hydrolytic activity on dinucleoside tetraphosphates | Distinguishing related activities |
| Ap4A synthetase (counterpart) | Synthesizes dinucleoside tetraphosphates | Balance with hydrolase activity |
| Gp4G metabolizing enzymes | Control guanosine tetraphosphate pools | Substrate specificity |
| Nudix hydrolase family members | Related dinucleoside polyphosphate hydrolases | Comparative enzymology |
| Drosophila developmental regulators | Modulate enzyme activity during embryogenesis | Developmental timing |
| Human anti-rat cross-reactive protein | Recognized by anti-rat tetraphosphatase antibody | Evolutionary conservation |
| Plant phosphodiesterases | Hydrolyze ApppA and AppppA | Plant stress responses |
| Bacterial Ap4A hydrolase | Controls Ap4A levels in bacteria | Microbial stress responses |
| Rat tissue-specific isoforms | Differential expression across tissues | Tissue-specific functions |
| Drosophila embryo extracts | Source for developmental studies | Embryonic regulation |
| Human blood cell extracts | Source for human enzyme | Clinical relevance |
How Is bis(5'-nucleosyl)-tetraphosphatase activity Regulated?
The activity of bis(5'-nucleosyl)-tetraphosphatase is regulated at multiple levels. In Drosophila embryos, enzyme activity changes during development, indicating developmental control. Tissue-specific differences in rat tissues suggest organ-specific regulation. Substrate availability and the presence of competing phosphodiesterases can also modulate effective activity. Additionally, the enzyme's expression may be influenced by cellular stress, as dinucleoside polyphosphates accumulate under stress conditions.
bis(5'-nucleosyl)-tetraphosphatase activity and Human Disease
| Gene | Disease / Biology | Potential Experimental Model |
|---|---|---|
| Drosophila bis(5'-nucleosyl)-tetraphosphatase | Developmental regulation | Drosophila knockout and overexpression |
| Human blood cell dinucleoside tetraphosphatase | Nucleotide homeostasis | Human cell line knockout |
| E. coli Ap4A hydrolase | Bacterial stress response | Bacterial knockout and complementation |
| Rat liver dinucleoside tetraphosphatase | Liver metabolism | Rat hepatocyte models |
| Lupinus luteus diadenosine tetraphosphatase | Plant stress | Plant knockout and overexpression |
Cancer and cell proliferation
Dinucleoside polyphosphates such as Ap4A have been implicated in cell proliferation and stress responses, and their hydrolysis by bis(5'-nucleosyl)-tetraphosphatase may influence cancer cell growth. Altered expression of the enzyme could affect nucleotide pools and signaling pathways relevant to tumorigenesis.
Neurodegeneration and stress responses
Ap4A and related compounds accumulate under oxidative stress and may contribute to neuronal damage. The enzyme's role in clearing these molecules suggests a protective function in neurodegenerative contexts.
Infectious disease and microbial stress
Bacterial Ap4A hydrolase is involved in stress responses, and its inhibition could affect bacterial survival. Studies on E. coli diadenosine tetraphosphate pyrophosphohydrolase provide a basis for antibacterial target evaluation.
Plant stress and agriculture
Plant enzymes hydrolyzing ApppA and AppppA are implicated in nucleotide metabolism under stress. Understanding these enzymes may inform crop stress tolerance strategies.
From bis(5'-nucleosyl)-tetraphosphatase activity-Related Genes to Experimental Models
| Research Question | Suitable Model |
|---|---|
| Does loss of bis(5'-nucleosyl)-tetraphosphatase affect Ap4A levels? | CRISPR knockout in human cell lines |
| What is the effect of a catalytic point mutation on enzyme activity? | Point-mutation knock-in in Drosophila or human cells |
| How does tagged enzyme localize in cells? | Knock-in of fluorescent or epitope tag |
| Does overexpression alter stress resistance? | Overexpression in mammalian cells or Drosophila |
| Which tissues express the enzyme? | Reporter knock-in in mouse models |
| Can bacterial hydrolase be targeted by inhibitors? | E. coli knockout and inhibitor screening |
How to Study the bis(5'-nucleosyl)-tetraphosphatase activity Process
| Method | What It Measures | Typical Application |
|---|---|---|
| Enzymatic hydrolysis assay | Rate of substrate cleavage | Kinetic characterization |
| HPLC | Substrate and product quantification | Tissue distribution studies |
| Western blot | Protein expression and cross-reactivity | Human enzyme detection |
| Molecular cloning | Gene sequence and function | Bacterial enzyme studies |
| Developmental staging | Activity changes over time | Drosophila embryogenesis |
| Substrate specificity assays | Preference for different dinucleoside tetraphosphates | Comparative enzymology |
| Immunoprecipitation | Protein isolation | Antibody-based purification |
| CRISPR knockout | Gene function loss | Causal testing in cells |
Enzymatic assays
Purified enzyme preparations are used to measure hydrolysis of dinucleoside tetraphosphates such as Ap4A and Gp4G. Radioactive or fluorescent substrates allow kinetic characterization.
Chromatographic separation
HPLC and related techniques separate substrates and products to quantify enzyme activity in tissue extracts and purified fractions.
Immunological detection
Antibodies against rat tetraphosphatase can recognize human enzyme, enabling Western blotting and immunoprecipitation.
Genetic and molecular cloning
Cloning of the E. coli gene for diadenosine tetraphosphate pyrophosphohydrolase enabled sequence analysis and functional studies.
How CRISPR Can Be Used to Study GO:0008796 bis(5'-nucleosyl)-tetraphosphatase activity
Knockout
CRISPR knockout of genes encoding bis(5'-nucleosyl)-tetraphosphatase activity can eliminate enzyme function, allowing researchers to measure changes in Ap4A and Gp4G levels and downstream phenotypes.
Point Mutation
Introducing catalytic point mutations into the enzyme active site can distinguish hydrolysis-dependent functions from structural roles, as demonstrated by characterization of the Drosophila enzyme.
Knock-in
Knock-in of epitope or fluorescent tags enables localization and interaction studies of the enzyme in its native context.
Overexpression
Overexpression of the enzyme can reduce dinucleoside polyphosphate levels and test whether increased hydrolysis protects against stress or alters proliferation.
How EDITGENE Supports bis(5'-nucleosyl)-tetraphosphatase activity Research
Researchers studying bis(5'-nucleosyl)-tetraphosphatase activity-related genes often need to determine whether a candidate gene is causally involved in nucleotide metabolism, stress responses, or disease. EDITGENE provides CRISPR-based cell model services to enable such functional studies with precision and reproducibility.
Contact EDITGENE today to design your custom CRISPR model for bis(5'-nucleosyl)-tetraphosphatase activity research.
Frequently Asked Questions About bis(5'-nucleosyl)-tetraphosphatase activity
What is bis(5'-nucleosyl)-tetraphosphatase activity?
It is a molecular function defined by GO:0008796 that catalyzes the hydrolysis of P(1),P(4)-bis(5'-nucleosyl)tetraphosphate into two nucleotides.
What genes are involved in bis(5'-nucleosyl)-tetraphosphatase activity?
Genes encoding this activity have been studied in Drosophila, rat, E. coli, plants, and human blood cells.
What is the substrate of bis(5'-nucleosyl)-tetraphosphatase?
The enzyme hydrolyzes dinucleoside tetraphosphates such as diadenosine tetraphosphate (Ap4A) and bis(5'-guanosyl) tetraphosphate (Gp4G).
Where is bis(5'-nucleosyl)-tetraphosphatase found?
It is found in rat tissues, Drosophila embryos, human blood cells, higher plants, and bacteria.
How is bis(5'-nucleosyl)-tetraphosphatase regulated?
Its activity is developmentally regulated in Drosophila and varies across tissues in mammals.
What diseases are linked to bis(5'-nucleosyl)-tetraphosphatase?
Altered activity may affect nucleotide signaling in cancer, neurodegeneration, and infectious disease contexts.
What methods are used to study bis(5'-nucleosyl)-tetraphosphatase?
Enzymatic assays, HPLC, Western blot, and CRISPR knockout models are commonly used.
Can CRISPR be used to study bis(5'-nucleosyl)-tetraphosphatase?
Yes, CRISPR knockout, point mutation, knock-in, and overexpression models enable functional studies of the encoding genes.
What is the GO ID for bis(5'-nucleosyl)-tetraphosphatase activity?
The GO ID is GO:0008796.
Is bis(5'-nucleosyl)-tetraphosphatase the same as asymmetrical dinucleoside tetraphosphatase?
Yes, asymmetrical dinucleoside tetraphosphatase is a common name for this activity.
Conclusion
GO:0008796 bis(5'-nucleosyl)-tetraphosphatase activity is a conserved molecular function that controls dinucleoside polyphosphate levels and influences stress responses, development, and disease-relevant pathways. Researchers can now leverage CRISPR-based models to dissect the causal roles of genes encoding this activity. EDITGENE provides comprehensive services to accelerate such studies.
References
- 1. Winward L et al.. 2007. Characterisation of a bis(5'-nucleosyl)-tetraphosphatase (asymmetrical) from Drosophila melanogaster.. Int J Biochem Cell Biol 39(5):943-54 PMID: 17344088
- 2. Cameselle JC et al.. 1982. Bis-(5'-guanosyl) tetraphosphatase in rat tissues.. Biochem J 201(2):405-10 PMID: 6282267
- 3. Vallejo CG et al.. 1989. Diadenosine 5",5"'P1,P4-tetraphosphatase in Drosophila embryos: developmental regulation and characterization.. Int J Biochem 21(11):1223-8 PMID: 2558922
- 4. Sillero MA et al.. 1997. 2',3'-dideoxynucleoside triphosphates (ddNTP) and di-2',3'-dideoxynucleoside tetraphosphates (ddNp4ddN) behave differently to the corresponding NTP and Np4N counterparts as substrates of firefly luciferase, dinucleoside tetraphosphatase and phosphodiesterases.. Biochim Biophys Acta 1334(2-3):191-9 PMID: 9101713
- 5. Cameselle JC et al.. 1984. Two low Km hydrolytic activities on dinucleoside 5',5"'-P1,P4-tetraphosphates in rat liver. Characterization as the specific dinucleoside tetraphosphatase and a phosphodiesterase I-like enzyme.. J Biol Chem 259(5):2879-85 PMID: 6321483
- 6. Mechulam Y et al.. 1985. Molecular cloning of the Escherichia coli gene for diadenosine 5',5'''-P1,P4-tetraphosphate pyrophosphohydrolase.. J Bacteriol 164(1):63-9 PMID: 2995325
- 7. Jakubowski H et al.. 1983. Enzymes hydrolyzing ApppA and/or AppppA in higher plants. Purification and some properties of diadenosine triphosphatase, diadenosine tetraphosphatase, and phosphodiesterase from yellow lupin (Lupinus luteus) seeds.. J Biol Chem 258(16):9982-9 PMID: 6309793
- 8. Pinto RM et al.. 1991. Dinucleoside tetraphosphatase from human blood cells. Purification and characterization as a high specific activity enzyme recognized by an anti-rat tetraphosphatase antibody.. FEBS Lett 287(1-2):85-8 PMID: 1652465
