GO:0004749 ribose phosphate diphosphokinase activity: Mechanism, Genes and Research Methods
Research-grade guide for scientists and biopharma professionals
Key Takeaways
• GO:0004749 (ribose phosphate diphosphokinase activity) catalyzes the reaction D-ribose 5-phosphate + ATP = 5-phospho-alpha-D-ribose 1-diphosphate (PRPP) + AMP + 2 H+, a rate-limiting step in nucleotide biosynthesis.
• The enzyme is encoded by PRPS1, PRPS2 and PRPS1L1 in mammals, with PRPS1 being the most widely studied and disease-associated isoform.
• PRPS1 mutations cause a spectrum of human disorders including PRPS1 superactivity, Arts syndrome, Charcot-Marie-Tooth disease type 5, and X-linked deafness.
• PRPS activity is tuned by redox homeostasis and is required for Myc-driven lymphoma proliferation, linking it to cancer metabolism.
• In melanoma, NDUFS3 promotes proliferation via glucose metabolism reprogramming that induces AMPK phosphorylation of PRPS1 to increase purine nucleotide synthesis.
• CRISPR knockout, point-mutation, knock-in and overexpression models are essential to dissect PRPS1/PRPS2 function in disease and to validate therapeutic targets.
Description
Ribose phosphate diphosphokinase activity (GO:0004749) is a molecular function that catalyzes the transfer of a diphosphate group from ATP to D-ribose 5-phosphate, yielding 5-phospho-alpha-D-ribose 1-diphosphate (PRPP), AMP and two protons. This reaction is the committed and rate-limiting step in the de novo and salvage pathways of purine and pyrimidine nucleotide biosynthesis, making it indispensable for DNA and RNA synthesis, energy metabolism, and cellular proliferation. Because PRPP is a central metabolite that feeds into histidine and tryptophan biosynthesis as well as NAD and coenzyme A production, the enzyme sits at a metabolic hub. Mammalian ribose phosphate diphosphokinase activity is encoded by three genes: PRPS1, PRPS2, and the testis-specific PRPS1L1. PRPS1 is the most extensively characterized isoform and is subject to allosteric regulation by nucleotides and inorganic phosphate, as well as post-translational modification. Dysregulation of PRPS1 activity is directly linked to human disease: germline mutations cause PRPS1 superactivity, Arts syndrome, Charcot-Marie-Tooth disease type 5, and X-linked deafness, while altered expression contributes to cancer progression. Recent studies show that PRPS activity tunes redox homeostasis in Myc-driven lymphoma and that NDUFS3 promotes melanoma proliferation by inducing AMPK-mediated phosphorylation of PRPS1. For researchers, GO:0004749 represents a tractable node for metabolic, genetic, and pharmacological interrogation. Understanding its catalytic mechanism, regulation, and disease relevance requires precise genetic models, which CRISPR-based knockout, point-mutation, knock-in, and overexpression approaches can provide.
ribose phosphate diphosphokinase activity At A Glance
| GO ID | GO:0004749 |
|---|---|
| GO term | ribose phosphate diphosphokinase activity |
| Ontology | molecular_function |
| Synonym | PRPP synthetase activity; phosphoribosylpyrophosphate synthetase activity; ribose-phosphate pyrophosphokinase activity |
| Major function | Catalyzes the formation of PRPP from ribose 5-phosphate and ATP, a rate-limiting step in nucleotide biosynthesis |
| Reaction | D-ribose 5-phosphate + ATP = 5-phospho-alpha-D-ribose 1-diphosphate + AMP + 2 H+ |
| Cofactors | Mg2+ and inorganic phosphate are required for optimal activity |
| Regulation | Allosterically inhibited by ADP and GDP; activated by inorganic phosphate |
| Human genes | PRPS1, PRPS2, PRPS1L1 |
What Is GO:0004749?
GO:0004749, ribose phosphate diphosphokinase activity, is defined as the catalysis of the reaction: D-ribose 5-phosphate + ATP = 5-phospho-alpha-D-ribose 1-diphosphate + AMP + 2 H+. In simpler terms, it is the enzyme activity that attaches a diphosphate group from ATP onto ribose 5-phosphate to produce PRPP, a key precursor for nucleotide synthesis. This activity is synonymous with PRPP synthetase, phosphoribosylpyrophosphate synthetase, and ribose-phosphate pyrophosphokinase, among other names.
Why Is ribose phosphate diphosphokinase activity Important in Cell Biology?
Ribose phosphate diphosphokinase activity is essential for the production of PRPP, the universal precursor for purine and pyrimidine nucleotides, and thus for DNA replication, RNA transcription, and cellular energy metabolism. Its central role in nucleotide synthesis makes it a critical determinant of cell proliferation, and its dysregulation is implicated in a wide range of human diseases, from rare inherited disorders such as PRPS1 superactivity and Arts syndrome to common cancers like lymphoma and melanoma. Understanding this activity at the molecular, cellular, and organismal levels is therefore fundamental to both basic biology and translational medicine.
• Rate-limiting step in purine and pyrimidine nucleotide biosynthesis.
• Germline mutations in PRPS1 cause PRPS1 superactivity, Arts syndrome, Charcot-Marie-Tooth disease type 5, and X-linked deafness.
• PRPS activity tunes redox homeostasis in Myc-driven lymphoma, linking nucleotide synthesis to oxidative stress.
• NDUFS3 promotes melanoma proliferation via AMPK-mediated phosphorylation of PRPS1, highlighting a role in cancer metabolism.
• PRPS1 structural essentials have been experimentally clarified, aiding drug design.
• The enzyme is a potential target for antimicrobials and anticancer therapies.
• PRPS1 is subject to allosteric regulation by nucleotides and phosphate, making it a dynamic metabolic sensor.
• CRISPR models of PRPS1/PRPS2 are valuable for dissecting isoform-specific functions.
Molecular Mechanism of ribose phosphate diphosphokinase activity
Substrate binding and catalysis
In simple terms: The enzyme grabs ribose 5-phosphate and ATP, then transfers a diphosphate group from ATP onto the sugar.
Ribose phosphate diphosphokinase binds D-ribose 5-phosphate and ATP in a sequential ordered mechanism. The enzyme catalyzes the transfer of the beta- and gamma-phosphates of ATP to the 1-hydroxyl group of ribose 5-phosphate, releasing AMP and two protons, and forming PRPP. Structural studies of PRPS1 have identified key residues essential for substrate binding and catalysis, including those involved in ATP coordination and ribose 5-phosphate recognition.
Cofactors and metal requirements
In simple terms: Magnesium ions and phosphate help the enzyme work efficiently.
The activity requires divalent cations, typically Mg2+, which chelate ATP and facilitate phosphoryl transfer. Inorganic phosphate (Pi) acts as an essential activator, while high concentrations of ADP and GDP inhibit the enzyme allosterically. These cofactors ensure that PRPP synthesis is tightly coupled to the cellular energy state and nucleotide demand.
Allosteric regulation
In simple terms: The enzyme can be switched on or off by small molecules that bind outside the active site.
Mammalian PRPS1 is allosterically inhibited by ADP and GDP, which bind to a regulatory site distinct from the active site. Inorganic phosphate antagonizes this inhibition, activating the enzyme. This regulation allows PRPP production to respond to the energy charge and purine nucleotide pools of the cell. Mutations that disrupt allosteric regulation can lead to PRPS1 superactivity, a condition characterized by excessive purine synthesis.
Post-translational modification and redox control
In simple terms: Chemical tags and the cell's redox state can change how active the enzyme is.
Recent work shows that PRPS activity is tuned by redox homeostasis in Myc-driven lymphoma, where changes in oxidative stress affect PRPP synthesis and nucleotide production. In melanoma, AMPK phosphorylates PRPS1, increasing its activity and promoting purine nucleotide synthesis. These modifications integrate PRPS1 into broader signaling networks that control cell growth and survival.
Key Genes Involved in GO:0004749 ribose phosphate diphosphokinase activity
The following genes encode proteins with ribose phosphate diphosphokinase activity or directly regulate it in mammals.
| Gene | Major Role | Research Relevance |
|---|---|---|
| PRPS1 | Encodes the major isoform of ribose phosphate diphosphokinase; catalyzes PRPP synthesis | Mutations cause PRPS1 superactivity, Arts syndrome, CMTX5, and X-linked deafness |
| PRPS2 | Encodes a second isoform with overlapping but distinct functions | Isoform-specific roles in nucleotide synthesis and cancer metabolism |
| PRPS1L1 | Testis-specific isoform | Potential role in spermatogenesis and male fertility |
| NDUFS3 | Mitochondrial complex I subunit; promotes AMPK phosphorylation of PRPS1 | Linked to melanoma proliferation via glucose metabolism reprogramming |
| AMPK | Energy sensor kinase that phosphorylates PRPS1 | Regulates PRPS1 activity in response to metabolic stress |
| MYC | Oncogenic transcription factor that drives PRPS activity | PRPS activity tunes redox homeostasis in Myc-driven lymphoma |
| HPRT1 | Hypoxanthine phosphoribosyltransferase; salvage enzyme using PRPP | Deficiency causes Lesch-Nyhan syndrome; PRPP availability affects disease |
| APRT | Adenine phosphoribosyltransferase; uses PRPP in purine salvage | Deficiency causes 2,8-dihydroxyadenine urolithiasis |
| PPAT | Amidophosphoribosyltransferase; first enzyme in de novo purine synthesis using PRPP | Regulated by PRPP levels; target for antimetabolites |
| GART | Phosphoribosylglycinamide formyltransferase; uses PRPP in purine synthesis | Potential biomarker in purine-related disorders |
| ATIC | Bifunctional purine biosynthesis protein; uses PRPP | Involved in purine synthesis and cancer |
| IMPDH1 | Inosine monophosphate dehydrogenase; downstream of PRPP in guanine synthesis | Target of immunosuppressants; linked to PRPS activity |
| IMPDH2 | Second isoform of IMPDH | Overexpressed in many cancers; connects PRPP to guanine nucleotides |
| RRM1 | Ribonucleotide reductase subunit; converts nucleotides to deoxynucleotides | Downstream of PRPP; target in cancer therapy |
| RRM2 | Ribonucleotide reductase subunit | Cell cycle-regulated; links PRPP to DNA synthesis |
| PRPSAP1 | PRPS1-associated protein 1; regulates PRPS1 activity | Modulates PRPP synthesis; potential disease modifier |
| PRPSAP2 | PRPS1-associated protein 2; regulates PRPS1 activity | Isoform-specific regulation of PRPS |
How Is ribose phosphate diphosphokinase activity Regulated?
Ribose phosphate diphosphokinase activity is regulated at multiple levels. Allosterically, PRPS1 is inhibited by ADP and GDP and activated by inorganic phosphate, allowing PRPP synthesis to track the cellular energy charge and purine nucleotide pools. Post-translationally, AMPK phosphorylates PRPS1 in response to metabolic stress, increasing its activity and promoting purine nucleotide synthesis in melanoma. Redox homeostasis also tunes PRPS activity, as shown in Myc-driven lymphoma where changes in oxidative stress affect PRPP production. Additionally, PRPS1 activity can be modulated by interaction with PRPSAP1 and PRPSAP2, which are regulatory subunits that influence enzyme stability and activity. These layers of regulation ensure that PRPP synthesis is precisely matched to the cell's biosynthetic demands.
ribose phosphate diphosphokinase activity and Human Disease
| Gene | Disease / Biology | Potential Experimental Model |
|---|---|---|
| PRPS1 | PRPS1 superactivity; Arts syndrome; CMTX5; X-linked deafness | Knock-in mouse models with patient mutations; patient-derived iPSCs |
| PRPS1 | Myc-driven lymphoma; redox homeostasis | CRISPR knockout in lymphoma cell lines; xenograft models |
| PRPS1 | Melanoma proliferation via AMPK phosphorylation | Point-mutation knock-in of phospho-deficient PRPS1; melanoma cell lines |
| PRPS2 | Cancer metabolism; nucleotide synthesis | Knockout and overexpression in cancer cell lines |
| F. prausnitzii PRPS | Colorectal cancer immunotherapy response | Bacterial enzyme overexpression in gut microbiota models |
PRPS1 superactivity and Arts syndrome
Germline mutations in PRPS1 that increase enzyme activity cause PRPS1 superactivity, characterized by hyperuricemia, gout, and in severe cases, neurological impairment and sensorineural deafness. Loss-of-function mutations in PRPS1 cause Arts syndrome, an X-linked disorder featuring intellectual disability, ataxia, and hearing loss. These contrasting phenotypes underscore the importance of precise PRPS1 dosage for human health.
Charcot-Marie-Tooth disease type 5 and X-linked deafness
PRPS1 mutations are also associated with Charcot-Marie-Tooth disease type 5 (CMTX5), a peripheral neuropathy with deafness, and with X-linked nonsyndromic deafness. These conditions highlight the critical role of PRPS1 in neuronal and auditory function, likely due to impaired nucleotide synthesis in these tissues.
Cancer metabolism and lymphoma
PRPS activity is required for Myc-driven lymphoma proliferation, where it tunes redox homeostasis and supports nucleotide synthesis. In melanoma, NDUFS3 promotes proliferation via glucose metabolism reprogramming that induces AMPK phosphorylation of PRPS1, increasing purine nucleotide synthesis. These findings suggest that PRPS1 is a metabolic vulnerability in certain cancers.
Microbial PRPS and immunotherapy
A Faecalibacterium prausnitzii enzyme with PRPS activity reprograms PD-L1 trafficking and sensitizes colorectal cancer to immunotherapy in mice, indicating that microbial PRPS can influence host antitumor immunity. This opens new avenues for microbiome-based cancer therapy.
From ribose phosphate diphosphokinase activity-Related Genes to Experimental Models
| Research Question | Suitable Model |
|---|---|
| What is the effect of complete PRPS1 loss on cell viability? | CRISPR knockout of PRPS1 in cancer cell lines |
| How do disease-associated PRPS1 mutations affect enzyme activity? | Point-mutation knock-in of PRPS1 variants (e.g., D52H, N114S) |
| Can wild-type PRPS1 rescue PRPS1 knockout phenotypes? | Knock-in of tagged PRPS1 at the endogenous locus |
| Does PRPS1 overexpression drive nucleotide synthesis and proliferation? | Doxycycline-inducible overexpression of PRPS1 |
| What is the role of PRPS2 in compensating for PRPS1 loss? | Double knockout of PRPS1 and PRPS2 |
| How does AMPK phosphorylation of PRPS1 affect melanoma growth? | Phospho-mimetic and phospho-deficient PRPS1 knock-in in melanoma cells |
How to Study the ribose phosphate diphosphokinase activity Process
| Method | What It Measures | Typical Application |
|---|---|---|
| Coupled enzymatic assay | PRPS activity via AMP release or PRPP formation | Kinetic characterization of wild-type and mutant PRPS1 |
| LC-MS metabolomics | Intracellular PRPP and nucleotide levels | Assessing metabolic impact of PRPS1/PRPS2 manipulation |
| CRISPR knockout screens | Gene essentiality and synthetic lethality | Identifying modifiers of PRPS1 dependency |
| Western blot | Protein expression and phosphorylation status | Validating AMPK-mediated PRPS1 phosphorylation |
| Immunofluorescence | Subcellular localization of PRPS1 | Studying PRPS1 trafficking and interactions |
| X-ray crystallography | Three-dimensional structure of PRPS1 | Structure-guided drug design |
| RNA-seq | Transcriptional changes upon PRPS1 perturbation | Pathway analysis in disease models |
| Ribo-seq | Translational efficiency of PRPS1 and related genes | Investigating post-transcriptional regulation |
Enzymatic assays for PRPS activity
Ribose phosphate diphosphokinase activity can be measured in cell lysates or purified protein using a coupled spectrophotometric assay that monitors the formation of PRPP or the release of AMP. Radioactive assays using [14C]ribose 5-phosphate are also common. These methods allow determination of kinetic parameters and the effects of allosteric regulators.
Metabolomics and nucleotide profiling
Liquid chromatography-mass spectrometry (LC-MS) can quantify PRPP and downstream nucleotides in cells and tissues. This approach is used to assess how genetic manipulation of PRPS1/PRPS2 affects purine and pyrimidine pools, as demonstrated in lymphoma and melanoma models.
CRISPR-based genetic screens
Genome-wide CRISPR knockout screens can identify genes that are synthetic lethal with PRPS1 loss or that modulate sensitivity to PRPS inhibitors. Such screens have been used to uncover metabolic vulnerabilities in cancer.
Structural biology and biophysics
X-ray crystallography and cryo-EM can resolve the structure of PRPS1 in complex with substrates and regulators. These studies have clarified the structural essentials of PRPS1 and guide the design of small-molecule inhibitors.
How CRISPR Can Be Used to Study GO:0004749 ribose phosphate diphosphokinase activity
Knockout
CRISPR knockout of PRPS1 or PRPS2 in cell lines abolishes ribose phosphate diphosphokinase activity, leading to reduced PRPP levels and impaired nucleotide synthesis. This approach is used to study the essentiality of PRPS isoforms in cancer cell proliferation and survival. Knockout models also help identify compensatory mechanisms and synthetic lethal interactions.
Point Mutation
CRISPR-mediated point mutations can introduce disease-associated PRPS1 variants (e.g., D52H, N114S) into the endogenous locus. These models allow precise dissection of how specific mutations alter enzyme activity, allosteric regulation, and downstream phenotypes, as seen in PRPS1 superactivity and Arts syndrome.
Knock-in
Knock-in of tagged PRPS1 (e.g., FLAG or GFP) at the endogenous locus enables studies of protein localization, interaction, and dynamics under physiological expression levels. This is valuable for understanding how PRPS1 is regulated by post-translational modifications such as AMPK phosphorylation.
Overexpression
CRISPR activation (CRISPRa) or lentiviral overexpression of PRPS1/PRPS2 can drive excessive PRPP synthesis, mimicking PRPS1 superactivity. Overexpression models are used to study the consequences of elevated nucleotide synthesis on cell growth, redox balance, and tumorigenesis.
How EDITGENE Supports ribose phosphate diphosphokinase activity Research
Researchers studying ribose phosphate diphosphokinase activity-related genes often need to determine whether a candidate gene is causally involved in a specific phenotype, such as cancer cell proliferation or neuronal survival. EDITGENE provides a comprehensive suite of CRISPR-based services to generate precisely engineered cell models, enabling rigorous functional validation of PRPS1, PRPS2, and their regulators.
Contact EDITGENE today to design your custom CRISPR model for ribose phosphate diphosphokinase activity research.
Related Products
| Product name | Cat.No. | Species | Gene ID | |
|---|---|---|---|---|
| PRPS1 Knockout HEK293 Cell Line | EDJ-KQ2295 | Human | 5631 | Details Get a Quote |
| PRPS2 Knockout HEK293 Cell Line | EDJ-KQ5548 | Human | 5634 | Details Get a Quote |
| PRPS1L1 Knockout HEK293 Cell Line | EDJ-KQ8127 | Human | 221823 | Details Get a Quote |
| PRPS1 Knockout HCT 116 Cell Line | EDJ-KQ21331 | Human | 5631 | Details Get a Quote |
| PRPS1 Knockout A-549 Cell Line | EDJ-KQ22659 | Human | 5631 | Details Get a Quote |
| PRPS1 Knockout HeLa Cell Line | EDJ-KQ22661 | Human | 5631 | Details Get a Quote |
| PRPS2 Knockout A-549 Cell Line | EDJ-KQ28807 | Human | 5634 | Details Get a Quote |
| PRPS2 Knockout HCT 116 Cell Line | EDJ-KQ28808 | Human | 5634 | Details Get a Quote |
| PRPS2 Knockout HeLa Cell Line | EDJ-KQ28809 | Human | 5634 | Details Get a Quote |
| PRPS1L1 Knockout HeLa Cell Line | EDJ-KQ59177 | Human | 221823 | Details Get a Quote |
| PRPS1L1 Knockout A-549 Cell Line | EDJ-KQ67648 | Human | 221823 | Details Get a Quote |
| PRPS1L1 Knockout HCT 116 Cell Line | EDJ-KQ76034 | Human | 221823 | Details Get a Quote |
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Frequently Asked Questions About ribose phosphate diphosphokinase activity
What is ribose phosphate diphosphokinase activity?
Ribose phosphate diphosphokinase activity (GO:0004749) is the enzyme activity that catalyzes the formation of PRPP from ribose 5-phosphate and ATP, a key step in nucleotide biosynthesis.
What genes encode ribose phosphate diphosphokinase activity?
In humans, the activity is encoded by PRPS1, PRPS2, and PRPS1L1, with PRPS1 being the most studied isoform.
What diseases are associated with PRPS1 mutations?
PRPS1 mutations cause PRPS1 superactivity, Arts syndrome, Charcot-Marie-Tooth disease type 5, and X-linked deafness.
How is ribose phosphate diphosphokinase activity regulated?
It is allosterically inhibited by ADP and GDP, activated by inorganic phosphate, and post-translationally modified by AMPK phosphorylation.
What is the role of PRPS1 in cancer?
PRPS1 supports nucleotide synthesis and proliferation in cancers such as lymphoma and melanoma, and its activity is linked to redox homeostasis.
What experimental models are used to study PRPS1?
CRISPR knockout, point-mutation knock-in, tagged knock-in, and overexpression cell models are commonly used.
What is the reaction catalyzed by ribose phosphate diphosphokinase?
D-ribose 5-phosphate + ATP = 5-phospho-alpha-D-ribose 1-diphosphate + AMP + 2 H+.
How can I measure ribose phosphate diphosphokinase activity?
Enzymatic assays using coupled spectrophotometry or radiolabeled substrates, as well as LC-MS metabolomics for PRPP levels, are standard methods.
Is PRPS1 a potential drug target?
Yes, PRPS1 is considered a target for anticancer and antimicrobial therapies, and structural studies support inhibitor design.
What CRISPR services does EDITGENE offer for PRPS1 research?
EDITGENE provides knockout, point mutation, knock-in, overexpression, library screening, and bioinformatics services for PRPS1 and related genes.
Conclusion
Ribose phosphate diphosphokinase activity (GO:0004749) is a central metabolic function that governs PRPP synthesis and nucleotide availability, with profound implications for cell growth, redox balance, and human disease. From rare inherited disorders to cancer, the PRPS1 enzyme and its isoforms are critical nodes for both basic and translational research. Leveraging CRISPR-based models and advanced bioinformatics, researchers can now dissect the precise roles of PRPS1/PRPS2 in health and disease, paving the way for targeted therapies.
References
- 1. Adam MP et al.. 1993. Phosphoribosylpyrophosphate Synthetase Superactivity.. PMID: 20301734
- 2. Tatibana M et al.. 1995. Mammalian phosphoribosyl-pyrophosphate synthetase.. Adv Enzyme Regul 35:229-49 PMID: 7572345
- 3. MacMillan AC et al.. 2025. PRPS activity tunes redox homeostasis in Myc-driven lymphoma.. Redox Biol 84:103649 PMID: 40446642
- 4. Iwahana H et al.. 1996. [Amidophosphoribosyltransferase].. Nihon Rinsho 54(12):3202-6 PMID: 8976092
- 5. Xiong G et al.. 2025. NDUFS3 promotes proliferation via glucose metabolism reprogramming inducing AMPK phosphorylating PRPS1 to increase the purine nucleotide synthesis in melanoma.. Cell Death Differ 32(12):2193-2209 PMID: 40404919
- 6. Danielyan KE et al.. 2022. Experimental Clarification of PRPS-1 Structural Essentials.. Cell Biochem Biophys 80(4):699-709 PMID: 36201097
- 7. Ji S et al.. 2026. Faecalibacterium prausnitzii enzyme reprograms PD-L1 trafficking and sensitizes colorectal cancer to immunotherapy in mice.. Nat Microbiol 11(5):1318-1335 PMID: 41998161
- 8. Mittal R et al.. 2015. Association of PRPS1 Mutations with Disease Phenotypes.. Dis Markers 2015:127013 PMID: 26089585
