GO:0033862 UMP kinase activity: Mechanism, Genes and Research Methods
Research-grade guide for scientists and biopharma professionals
Key Takeaways
• GO:0033862 (UMP kinase activity) catalyzes the ATP-dependent phosphorylation of UMP to UDP, a committed step in de novo pyrimidine nucleotide biosynthesis.
• The bacterial enzyme PyrH (UMP kinase) directly modulates pyrimidine-specific promoter activity, linking nucleotide metabolism to gene regulation.
• In plants, UMP kinase activity is required for proper chloroplast development, as shown in rice mutants with defective UMPK.
• CMPK2, a mitochondrial pyrimidine kinase, drives neuroinflammation and brain injury after ischemic stroke, highlighting the disease relevance of UMP-related kinase pathways.
• CMPK2 also promotes NLRP3 inflammasome activation via the mtDNA-STING pathway in allergic rhinitis, connecting pyrimidine metabolism to innate immunity.
• CRISPR-based knockout, point-mutation, and knock-in models are essential to dissect the causal roles of UMP kinase genes in development and disease [3,7].
Description
UMP kinase activity (GO:0033862) is a molecular function defined by the catalysis of the reaction ATP + UMP = ADP + UDP. This phosphorylation step converts uridine monophosphate (UMP) into uridine diphosphate (UDP), a key intermediate in pyrimidine nucleotide metabolism. The enzyme is widely conserved, with the bacterial pyrH gene encoding a UMP kinase that directly participates in pyrimidine-specific modulation of promoter activity in Escherichia coli. In plants, UMP kinase activity is involved in proper chloroplast development, as demonstrated by rice mutants with impaired UMPK function. Researchers study this term to understand nucleotide homeostasis, RNA synthesis, and the metabolic regulation of gene expression. Beyond its canonical role, UMP kinase activity intersects with immune signaling and neuroinflammation through related pyrimidine kinases such as CMPK2, which promotes neuroinflammation and brain injury after ischemic stroke. CMPK2 also drives NLRP3 inflammasome activation via the mtDNA-STING pathway in house dust mite-induced allergic rhinitis. These findings position UMP kinase activity as a node connecting basic metabolism to disease pathogenesis, making it a compelling target for functional genomics and therapeutic development.
UMP kinase activity At A Glance
| GO ID | GO:0033862 |
|---|---|
| GO term | UMP kinase activity |
| Ontology | molecular_function |
| Synonym | ATP:UMP phosphotransferase activity, PyrH, SmbA, UMPK, UMP-kinase activity, uridine monophosphate kinase activity |
| Definition | Catalysis of the reaction: ATP + UMP = ADP + UDP. |
| Major function | Phosphorylation of UMP to UDP in pyrimidine nucleotide biosynthesis |
| Related disease | Ischemic stroke, metabolic dysfunction-associated steatohepatitis, allergic rhinitis, Alzheimer's disease |
| Key genes | pyrH (bacterial), UMPK (plant), CMPK2 (human) |
What Is GO:0033862?
UMP kinase activity (GO:0033862) is the catalytic function that transfers a phosphate group from ATP to UMP, yielding ADP and UDP. This reaction is a committed step in the pyrimidine salvage and de novo pathways, feeding UDP into downstream synthesis of UTP, CTP, and deoxypyrimidines. The enzyme is known by several synonyms, including ATP:UMP phosphotransferase, PyrH, SmbA, UMPK, and uridine monophosphate kinase. In bacteria, the pyrH-encoded UMP kinase directly modulates pyrimidine-specific promoter activity, linking the enzymatic reaction to transcriptional control. In plants, UMP kinase activity is required for proper chloroplast development, as shown by rice mutants.
Why Is UMP kinase activity Important in Cell Biology?
UMP kinase activity is essential for maintaining pyrimidine nucleotide pools required for RNA and DNA synthesis, cell proliferation, and metabolic signaling. Its product, UDP, is a precursor for UTP and CTP, which are needed for transcription and glycosylation reactions. In bacteria, the pyrH-encoded UMP kinase directly modulates pyrimidine-specific promoter activity, demonstrating a direct link between this enzymatic activity and gene regulation. In plants, UMP kinase activity is involved in proper chloroplast development, and its loss leads to defective photosynthetic machinery. In humans, the related mitochondrial kinase CMPK2 promotes neuroinflammation and brain injury after ischemic stroke, indicating that pyrimidine kinase pathways are central to neuroinflammatory disease. CMPK2 also promotes NLRP3 inflammasome activation via the mtDNA-STING pathway in allergic rhinitis, further expanding the disease relevance of this activity. Additionally, epigenetic control of microglial mitochondrial immunity by KAT7 drives Alzheimer's disease pathogenesis, highlighting the broader context of mitochondrial nucleotide metabolism in neurodegeneration. Thus, understanding UMP kinase activity is critical for basic metabolism, developmental biology, and translational medicine.
• Provides UDP for UTP and CTP synthesis, supporting RNA and DNA production.
• Regulates pyrimidine-specific promoter activity in bacteria, linking metabolism to transcription.
• Required for proper chloroplast development in rice, affecting photosynthesis.
• CMPK2, a related pyrimidine kinase, drives neuroinflammation after ischemic stroke.
• CMPK2 promotes NLRP3 inflammasome activation via mtDNA-STING in allergic rhinitis.
• CMPK2 in hepatocytes promotes metabolic dysfunction-associated steatohepatitis.
• Mitochondrial immunity and nucleotide metabolism are linked to Alzheimer's disease via KAT7.
• TBEV infection alters neuronal RNA profiles, potentially impacting pyrimidine metabolism.
• Plant NLR resistosome assembly involves nucleotide-binding domains, highlighting broader nucleotide signaling.
• UMP kinase is a potential antimicrobial target due to its essentiality in bacteria.
What Happens During UMP kinase activity?
Substrate binding and catalysis
In simple terms: The enzyme grabs UMP and ATP, then transfers a phosphate from ATP to UMP.
UMP kinase binds UMP and ATP in its active site. The reaction proceeds via a phosphotransfer mechanism, producing UDP and ADP. This step is a committed reaction in pyrimidine biosynthesis. In E. coli, the pyrH-encoded UMP kinase directly participates in pyrimidine-specific modulation of promoter activity, indicating that the catalytic event is coupled to transcriptional regulation.
Product channeling into nucleotide pools
In simple terms: The UDP made is used to build more nucleotides for RNA and DNA.
The UDP generated by UMP kinase is further phosphorylated to UTP and aminated to CTP. These nucleotides are essential for RNA synthesis, DNA replication, and glycosylation. In rice, loss of UMP kinase activity leads to defective chloroplast development, likely due to impaired nucleotide supply for plastid gene expression.
Regulation by pyrimidine intermediates
In simple terms: The enzyme's activity can be tuned by the levels of pyrimidine molecules.
In bacteria, UMP kinase is allosterically regulated by pyrimidine nucleotides, ensuring balanced nucleotide pools. The pyrH gene product directly modulates promoter activity, suggesting a feedback loop between enzyme activity and gene expression. In plants, UMP kinase activity is required for proper chloroplast development, and its regulation may involve developmental cues.
Integration with mitochondrial immunity
In simple terms: Related kinases in mitochondria link nucleotide metabolism to immune responses.
CMPK2, a mitochondrial pyrimidine kinase, promotes neuroinflammation and brain injury after ischemic stroke. It also drives NLRP3 inflammasome activation via the mtDNA-STING pathway in allergic rhinitis. These findings suggest that UMP-related kinase activities are integrated with innate immune signaling. Additionally, CMPK2 in hepatocytes promotes metabolic dysfunction-associated steatohepatitis, linking pyrimidine metabolism to liver disease.
Key Genes Involved in GO:0033862 UMP kinase activity
The following genes and proteins are directly or functionally linked to UMP kinase activity (GO:0033862) and its related pyrimidine kinase pathways.
| Gene | Major Role | Research Relevance |
|---|---|---|
| pyrH | Bacterial UMP kinase; modulates pyrimidine-specific promoter activity | Antimicrobial target; gene regulation studies |
| UMPK | Plant UMP kinase; required for chloroplast development | Photosynthesis and plant development |
| CMPK2 | Mitochondrial pyrimidine kinase; promotes neuroinflammation | Ischemic stroke, allergic rhinitis, MASH [1,2,5] |
| KAT7 | Epigenetic regulator of microglial mitochondrial immunity | Alzheimer's disease pathogenesis |
| NLRP3 | Inflammasome sensor; activated downstream of CMPK2 | Innate immunity and inflammation |
| STING | Cytosolic DNA sensor; mediates mtDNA-driven inflammation | Allergic rhinitis and neuroinflammation |
| NLR | Plant nucleotide-binding leucine-rich repeat receptor | Plant immunity; resistosome assembly |
| TBEV proteins | Viral effectors that alter neuronal RNA profiles | Flavivirus pathogenesis |
| UMP | Substrate of UMP kinase | Metabolic assays |
| UDP | Product of UMP kinase; precursor for UTP/CTP | Nucleotide metabolism |
| ATP | Phosphate donor | Enzyme kinetics |
| ADP | Product of the reaction | Enzyme assays |
| CTP | Downstream product of UDP amination | Pyrimidine biosynthesis |
| UTP | Downstream product of UDP phosphorylation | RNA synthesis |
| dTTP | Deoxypyrimidine derived from UDP | DNA synthesis |
| CMPK2 variants | Isoforms with mitochondrial localization | Disease association studies [1,5] |
How Is UMP kinase activity Regulated?
UMP kinase activity is regulated at multiple levels. In bacteria, the pyrH-encoded UMP kinase directly participates in pyrimidine-specific modulation of promoter activity, indicating a feedback mechanism where the enzyme influences its own expression or that of other pyrimidine genes. Allosteric regulation by pyrimidine nucleotides balances UMP kinase activity with cellular demands. In plants, UMP kinase activity is required for proper chloroplast development, and its expression may be developmentally regulated. In mammals, CMPK2, a related pyrimidine kinase, is induced under inflammatory conditions and contributes to neuroinflammation after ischemic stroke. CMPK2 also promotes NLRP3 inflammasome activation via the mtDNA-STING pathway in allergic rhinitis, suggesting that its activity is regulated by innate immune signals. Additionally, epigenetic control of microglial mitochondrial immunity by KAT7 drives Alzheimer's disease pathogenesis, linking chromatin regulation to mitochondrial nucleotide metabolism. These layers of regulation ensure that UMP kinase activity is tuned to metabolic and immune demands.
UMP kinase activity and Human Disease
| Gene | Disease / Biology | Potential Experimental Model |
|---|---|---|
| CMPK2 | Ischemic stroke; neuroinflammation | Microglial CMPK2 knockout mice |
| CMPK2 | Metabolic dysfunction-associated steatohepatitis | Hepatocyte-specific CMPK2 knockout mice |
| CMPK2 | Allergic rhinitis; NLRP3 inflammasome | House dust mite-induced allergic rhinitis model |
| KAT7 | Alzheimer's disease; microglial mitochondrial immunity | KAT7 conditional knockout mice |
| UMPK | Chloroplast development in rice | Rice umpK mutants |
Neuroinflammation and ischemic stroke
Microglial CMPK2 promotes neuroinflammation and brain injury after ischemic stroke. This mitochondrial pyrimidine kinase is induced in microglia and drives inflammatory responses, suggesting that UMP-related kinase activities contribute to stroke pathology. Targeting CMPK2 or related pathways may offer therapeutic avenues for neuroprotection.
Metabolic dysfunction-associated steatohepatitis (MASH)
Hepatocellular CMPK2 promotes the development of metabolic dysfunction-associated steatohepatitis. This finding links pyrimidine kinase activity to liver inflammation and lipid metabolism, expanding the disease relevance of UMP kinase family members beyond classical nucleotide biosynthesis.
Allergic rhinitis and inflammasome activation
CMPK2 promotes NLRP3 inflammasome activation via the mtDNA-STING pathway in house dust mite-induced allergic rhinitis. This positions UMP-related kinases as modulators of innate immune responses in allergic airway disease.
Alzheimer's disease and mitochondrial immunity
Epigenetic control of microglial mitochondrial immunity by KAT7 drives Alzheimer's disease pathogenesis. Although this study focuses on KAT7, it highlights the broader role of mitochondrial nucleotide metabolism and immunity in neurodegeneration, which may intersect with UMP kinase pathways.
From UMP kinase activity-Related Genes to Experimental Models
| Research Question | Suitable Model |
|---|---|
| Does loss of UMP kinase activity impair chloroplast development? | Rice UMPK knockout |
| Does pyrH-mediated UMP kinase activity regulate pyrimidine promoters? | E. coli pyrH mutants |
| Does CMPK2 drive neuroinflammation after stroke? | Microglial Cmpk2 knockout mice |
| Does hepatocellular CMPK2 promote MASH? | Liver-specific Cmpk2 knockout mice |
| Does CMPK2 activate NLRP3 via mtDNA-STING? | Cmpk2 knockout in allergic rhinitis model |
| Does KAT7 regulate microglial mitochondrial immunity in AD? | KAT7 conditional knockout mice |
How to Study the UMP kinase activity Process
| Method | What It Measures | Typical Application |
|---|---|---|
| Coupled enzyme assay | UMP kinase activity via ADP or UDP production | Enzyme kinetics and inhibitor screening |
| Knockout mutants | Loss-of-function phenotypes | Chloroplast development, neuroinflammation [1,3] |
| RNA-seq | Transcriptional changes | Pathogen infection, metabolic stress |
| Structural biology (cryo-EM) | Protein complex architecture | NLR resistosome and nucleotide-binding proteins |
| Inflammasome activation assays | NLRP3 and STING signaling | Allergic rhinitis models |
| Mitochondrial immunity profiling | Microglial mitochondrial function | Alzheimer's disease models |
| Promoter activity assays | Pyrimidine-specific promoter modulation | E. coli pyrH studies |
Enzymatic assays for UMP kinase activity
UMP kinase activity can be measured using coupled enzyme assays that monitor ADP production or UDP formation. In bacteria, the pyrH-encoded UMP kinase activity is assayed to study pyrimidine-specific promoter modulation. These assays are foundational for characterizing kinetic parameters and inhibitor sensitivity.
Genetic knockout and mutant models
Knockout models in rice, E. coli, and mice have been used to study UMP kinase function. Rice UMPK mutants show defective chloroplast development, while E. coli pyrH mutants reveal promoter modulation. Mouse Cmpk2 knockout models are used to study neuroinflammation and liver disease [1,2].
RNA profiling and transcriptomics
Integrative RNA profiling of TBEV-infected neurons and astrocytes reveals potential pathogenic effectors, which may include changes in pyrimidine metabolism genes. Transcriptomics can identify downstream effects of UMP kinase activity on gene expression.
Structural and biochemical studies
Reconstitution and structure of a plant NLR resistosome conferring immunity provides a framework for understanding nucleotide-binding domains in immune signaling. Similar structural approaches can be applied to UMP kinase to study substrate binding and catalysis.
How CRISPR Can Be Used to Study GO:0033862 UMP kinase activity
Knockout
CRISPR knockout of UMP kinase genes such as pyrH in bacteria, UMPK in rice, or CMPK2 in mice enables loss-of-function studies. Rice UMPK knockouts show defective chloroplast development, and Cmpk2 knockout mice are used to study neuroinflammation and MASH [1,2]. These models are essential for establishing causality.
Point Mutation
Point mutations can be introduced into the catalytic site of UMP kinase to dissect residues critical for ATP binding or catalysis. Such models help distinguish enzymatic activity from non-catalytic functions, as seen in studies of pyrH-mediated promoter modulation.
Knock-in
Knock-in of tagged or fluorescent UMP kinase alleles allows real-time tracking of protein localization and interactions. This approach is valuable for studying mitochondrial CMPK2 dynamics in neuroinflammation and for visualizing UMPK in chloroplasts.
Overexpression
Overexpression of UMP kinase or CMPK2 can model gain-of-function states observed in disease. For example, CMPK2 overexpression promotes NLRP3 inflammasome activation in allergic rhinitis, and hepatocellular CMPK2 overexpression drives MASH. These models are useful for therapeutic target validation.
How EDITGENE Supports UMP kinase activity Research
Researchers studying UMP kinase activity-related genes often need to determine whether a candidate gene is causally involved in nucleotide metabolism, development, or disease. CRISPR-based models provide the precision required to dissect these functions. EDITGENE offers a comprehensive suite of services to accelerate such studies.
Contact EDITGENE today to design your custom CRISPR model for UMP kinase activity research.
Frequently Asked Questions About UMP kinase activity
What is UMP kinase activity?
UMP kinase activity (GO:0033862) is the catalysis of the reaction ATP + UMP = ADP + UDP, a key step in pyrimidine nucleotide biosynthesis.
What genes are involved in UMP kinase activity?
Key genes include pyrH in bacteria, UMPK in plants, and CMPK2 in mammals [1,3,7].
What is the GO ID for UMP kinase activity?
The GO ID is GO:0033862.
What is the function of UMP kinase in chloroplast development?
UMP kinase activity is required for proper chloroplast development in rice, as shown by UMPK mutants.
How does CMPK2 relate to UMP kinase activity?
CMPK2 is a mitochondrial pyrimidine kinase that promotes neuroinflammation and inflammasome activation, linking UMP-related metabolism to immunity [1,5].
What diseases are associated with UMP kinase activity?
Associated diseases include ischemic stroke, metabolic dysfunction-associated steatohepatitis, allergic rhinitis, and Alzheimer's disease [1,2,5,8].
How can I study UMP kinase activity in the lab?
Enzymatic assays, CRISPR knockout models, RNA-seq, and structural biology are common approaches [3,4,6,7].
What are the synonyms for UMP kinase activity?
Synonyms include ATP:UMP phosphotransferase activity, PyrH, SmbA, UMPK, UMP-kinase activity, and uridine monophosphate kinase activity.
Does UMP kinase activity regulate gene expression?
Yes, in E. coli the pyrH-encoded UMP kinase directly participates in pyrimidine-specific modulation of promoter activity.
What CRISPR models are available for UMP kinase research?
Knockout, point mutation, knock-in, and overexpression models can be generated for genes such as CMPK2, UMPK, and pyrH [1,3,7].
Conclusion
UMP kinase activity (GO:0033862) is a fundamental enzymatic function that converts UMP to UDP, supporting pyrimidine nucleotide pools essential for RNA and DNA synthesis. Its roles extend beyond metabolism to gene regulation in bacteria, chloroplast development in plants, and neuroinflammation and liver disease in mammals. The related kinase CMPK2 has emerged as a key driver of ischemic stroke, MASH, and allergic rhinitis through inflammasome and STING pathways. CRISPR-based models are indispensable for dissecting these functions and validating therapeutic targets. EDITGENE provides comprehensive services to accelerate research on UMP kinase activity and its associated genes.
References
- 1. Guan X et al.. 2024. Microglial CMPK2 promotes neuroinflammation and brain injury after ischemic stroke.. Cell Rep Med 5(5):101522 PMID: 38701781
- 2. Zhu S et al.. 2025. Hepatocellular CMPK2 promotes the development of metabolic dysfunction-associated steatohepatitis.. J Hepatol 83(2):383-396 PMID: 39855350
- 3. Chen F et al.. 2018. UMP kinase activity is involved in proper chloroplast development in rice.. Photosynth Res 137(1):53-67 PMID: 29392476
- 4. Wang J et al.. 2019. Reconstitution and structure of a plant NLR resistosome conferring immunity.. Science 364(6435) PMID: 30948527
- 5. Zheng Y et al.. 2025. CMPK2 promotes NLRP3 inflammasome activation via mtDNA-STING pathway in house dust mite-induced allergic rhinitis.. Clin Transl Med 15(1):e70180 PMID: 39799434
- 6. Selinger M et al.. 2022. Integrative RNA profiling of TBEV-infected neurons and astrocytes reveals potential pathogenic effectors.. Comput Struct Biotechnol J 20:2759-2777 PMID: 35685361
- 7. Kholti A et al.. 1998. pyrH-encoded UMP-kinase directly participates in pyrimidine-specific modulation of promoter activity in Escherichia coli.. J Mol Biol 280(4):571-82 PMID: 9677289
- 8. Liu Y et al.. 2026. Epigenetic control of microglial mitochondrial immunity by KAT7 drives Alzheimer's disease pathogenesis.. Neuron PMID: 42263678
