GO:0045030 G protein-coupled UTP receptor activity: Mechanism, Genes and Research Methods
Research-grade guide for scientists and biopharma professionals
Key Takeaways
• GO:0045030 defines a molecular function: binding of UTP to a receptor that activates a heterotrimeric G-protein to initiate intracellular signaling.
• The prototypical gene encoding this activity is P2RY2 (P2Y2 receptor), a Gq-coupled receptor that responds to both UTP and ATP.
• P2Y2 receptors form homodimers via disulfide bridges, which can influence receptor trafficking and signaling.
• P2Y2 can physically associate with other G protein-coupled receptors such as B2 bradykinin receptors, enabling receptor crosstalk.
• UTP-evoked signaling is commonly measured by GTPgammaS binding, calcium mobilization, or downstream second messenger assays.
• Dysregulated UTP receptor activity is implicated in airway inflammation, cancer progression, and tissue remodeling, making it a target for pharmacological and CRISPR-based studies.
Description
G protein-coupled UTP receptor activity (GO:0045030) is a molecular function that describes the binding of uridine triphosphate (UTP) to a cell-surface receptor, which then activates a heterotrimeric G-protein to trigger intracellular signaling cascades. This activity is distinct from other purinergic receptor functions because it is specifically activated by UTP, although some receptors, such as P2Y2, can also respond to ATP. The receptor responsible for this activity, P2Y2, was cloned and characterized as a uridine nucleotide receptor, establishing the molecular basis for UTP-mediated G protein signaling. Researchers study this term to understand how extracellular nucleotides act as signaling molecules in processes ranging from calcium mobilization to cell proliferation and inflammation. The importance of GO:0045030 extends to pharmacology and disease biology, as UTP-responsive receptors are expressed in lung, immune, and epithelial tissues, where they regulate ion transport, mucus secretion, and inflammatory responses. Because UTP signaling is implicated in airway diseases and cancer, the receptor and its downstream effectors are attractive targets for therapeutic intervention and for functional genomics studies using CRISPR.
G protein-coupled UTP receptor activity At A Glance
| GO ID | GO:0045030 |
|---|---|
| GO term | G protein-coupled UTP receptor activity |
| Ontology | molecular_function |
| Synonym | purinoceptor type U; uridine nucleotide receptor activity; UTP-activated nucleotide receptor activity |
| Major function | Binding of UTP and activation of heterotrimeric G-protein signaling |
| Prototypical gene | P2RY2 (P2Y2 receptor) |
| Endogenous ligand | UTP (uridine triphosphate); also ATP for P2Y2 |
| G-protein coupling | Gq/11, leading to phospholipase C activation and calcium release |
| Tissue expression | Lung, epithelial cells, immune cells, and other tissues |
What Is GO:0045030?
According to the Gene Ontology, GO:0045030 (G protein-coupled UTP receptor activity) is defined as the function of combining with a nucleotide and transmitting the signal to a heterotrimeric G-protein complex to initiate a change in cell activity, activated by UTP. In other words, it is the specific molecular activity of a receptor that detects extracellular UTP and couples this detection to G-protein activation, leading to downstream cellular responses. This activity is synonymous with purinoceptor type U, uridine nucleotide receptor activity, and UTP-activated nucleotide receptor activity.
Why Is G protein-coupled UTP receptor activity Important in Cell Biology?
GO:0045030 is important because UTP-mediated G protein signaling regulates fundamental cellular processes such as calcium mobilization, secretion, and proliferation, and its dysregulation contributes to human diseases including chronic airway inflammation and cancer. The receptor P2Y2, which carries this activity, is a validated pharmacological target, and understanding its function at the molecular level informs drug discovery and functional genomics.
• UTP is a ubiquitous extracellular signaling molecule that activates G protein-coupled receptors to mobilize calcium and modulate cell behavior.
• The P2Y2 receptor (P2RY2) is the primary gene product responsible for GO:0045030, and its cloning established the molecular identity of the uridine nucleotide receptor.
• P2Y2 receptors form homodimers via disulfide bridges, which may affect receptor maturation and signaling efficiency.
• P2Y2 can heteromerize or closely associate with other GPCRs such as B2 bradykinin receptors, providing a mechanism for signal integration.
• GTPgammaS binding assays in lung membranes have been used to pharmacologically characterize G protein-coupled dinucleotide receptors, including UTP-responsive receptors.
• UTP receptor activity is implicated in airway diseases, where it stimulates chloride secretion and mucus production.
• Alkynyl chain modifications of nucleotides can modulate purinergic receptor activity, highlighting the potential for selective pharmacological targeting.
• CRISPR-based knockout of P2RY2 enables causal testing of UTP receptor function in disease models.
• Point mutations in the ligand-binding pocket can dissect UTP versus ATP selectivity.
• Reporter and calcium imaging assays allow real-time measurement of GO:0045030 activity in live cells.
Molecular Mechanism of G protein-coupled UTP receptor activity
Ligand binding and receptor activation
In simple terms: UTP binds to the receptor like a key in a lock, changing the receptor's shape so it can activate a G protein inside the cell.
The P2Y2 receptor (encoded by P2RY2) binds extracellular UTP with high affinity, and this binding induces conformational changes that enable the receptor to act as a guanine nucleotide exchange factor for heterotrimeric G proteins. Although UTP is the defining agonist for GO:0045030, P2Y2 is also activated by ATP, making it a dual-specificity receptor. The binding site involves positively charged residues that interact with the phosphate groups of UTP, and mutations in these residues can alter agonist potency.
G-protein coupling and downstream signaling
In simple terms: Once activated, the receptor turns on a G protein, which then triggers calcium release and other signals inside the cell.
Activated P2Y2 couples primarily to Gq/11 proteins, leading to activation of phospholipase C, production of inositol trisphosphate, and release of calcium from intracellular stores. This calcium mobilization is a hallmark of UTP receptor activity and is often used as a functional readout. In lung membranes, UTP-stimulated GTPgammaS binding confirms direct G-protein activation by dinucleotide receptors.
Receptor dimerization and crosstalk
In simple terms: Receptors can pair up with each other, which may change how they signal.
P2Y2 receptors form homodimers through disulfide bridges, and this dimerization may influence receptor trafficking and signaling. Furthermore, P2Y2 can closely associate with B2 bradykinin receptors, suggesting that heteromeric interactions modulate UTP responses. These findings indicate that GO:0045030 activity is not isolated but part of a larger signaling network.
Pharmacological modulation
In simple terms: Drugs or modified nucleotides can block or enhance the receptor's activity.
The presence of an alkynyl chain in adenine nucleosides/nucleotides affects their activity on purinergic receptors, including UTP-sensitive subtypes. This structure-activity relationship provides a basis for designing selective agonists or antagonists for GO:0045030. GTPgammaS binding assays have been used to characterize such compounds in native tissues.
Key Genes Involved in GO:0045030 G protein-coupled UTP receptor activity
The following genes and proteins are directly or indirectly involved in G protein-coupled UTP receptor activity (GO:0045030), based on published literature.
| Gene | Major Role | Research Relevance |
|---|---|---|
| P2RY2 | Encodes the P2Y2 receptor, the prototypical UTP-activated G protein-coupled receptor | Primary gene for GO:0045030; knockout and point mutation studies |
| GNAQ | Gq alpha subunit that couples to P2Y2 | Mediates downstream calcium signaling |
| GNA11 | G11 alpha subunit, alternative Gq family member | Potential compensatory G-protein in P2Y2 signaling |
| PLCB1 | Phospholipase C beta 1, effector enzyme activated by Gq | Produces IP3 and DAG, leading to calcium release |
| PLCB2 | Phospholipase C beta 2, another effector | May contribute to UTP-induced signaling in specific tissues |
| ITPR1 | Inositol 1,4,5-trisphosphate receptor, calcium channel | Mediates calcium release from ER upon UTP stimulation |
| BDKRB2 | B2 bradykinin receptor, associates with P2Y2 | Modulates UTP responses via receptor crosstalk |
| P2RY1 | ADP receptor, related purinergic GPCR | Can be studied comparatively for nucleotide selectivity |
| P2RY4 | UTP-preferring receptor in some species | Alternative UTP receptor, useful for comparative studies |
| P2RY6 | UDP-preferring receptor | Distinguishes UTP versus UDP pharmacology |
| P2RY11 | ATP/UTP receptor | Another UTP-responsive receptor, potential redundancy |
| P2RY12 | ADP receptor | Negative control for UTP specificity |
| P2RY13 | ADP receptor | Negative control for UTP specificity |
| P2RY14 | UDP-glucose receptor | Distinct ligand specificity |
| GNAI1 | Gi alpha subunit | May be activated by P2Y2 under certain conditions |
| GNA12 | G12 alpha subunit | Potential coupling to Rho signaling |
| GNA13 | G13 alpha subunit | Potential coupling to cytoskeletal changes |
| ARRB1 | Beta-arrestin 1 | Regulates receptor desensitization and internalization |
How Is G protein-coupled UTP receptor activity Regulated?
G protein-coupled UTP receptor activity is regulated at multiple levels. Receptor desensitization and internalization are controlled by phosphorylation and beta-arrestin recruitment, which terminate G-protein signaling. Dimerization of P2Y2 via disulfide bridges can modulate receptor function and trafficking. Additionally, heteromeric association with other GPCRs such as B2 bradykinin receptors can alter ligand sensitivity and downstream signaling. Pharmacological regulation by nucleotides with modified chains further highlights the potential to tune receptor activity.
G protein-coupled UTP receptor activity and Human Disease
| Gene | Disease / Biology | Potential Experimental Model |
|---|---|---|
| P2RY2 | Airway inflammation, mucus hypersecretion | Knockout mouse or human airway epithelial cell KO |
| P2RY2 | Cancer cell proliferation and migration | Cancer cell line overexpression or KO |
| BDKRB2 | Inflammatory pain and edema | Double KO with P2RY2 to study crosstalk |
| GNAQ | Uveal melanoma, other cancers | Point mutation knock-in to study constitutive signaling |
| PLCB1 | Developmental disorders, cancer | KO or knockdown to block UTP-induced calcium signaling |
Airway inflammation and chronic lung diseases
UTP receptor activity is implicated in airway epithelial ion transport and mucus secretion, and excessive UTP signaling contributes to chronic inflammatory lung diseases such as asthma and chronic obstructive pulmonary disease. P2Y2 receptors in lung membranes have been characterized using GTPgammaS binding, supporting their role in pulmonary pathophysiology.
Cancer progression
Purinergic signaling, including UTP-mediated activation of P2Y2, has been linked to cancer cell proliferation, migration, and metastasis in various tumor types. The receptor's ability to mobilize calcium and activate MAPK pathways provides a mechanistic link to oncogenesis.
Cardiovascular and renal disorders
UTP receptors are expressed in vascular smooth muscle and kidney, where they regulate vascular tone and ion transport. Dysregulation of these receptors may contribute to hypertension and renal dysfunction, although direct evidence from the cited literature is limited.
From G protein-coupled UTP receptor activity-Related Genes to Experimental Models
| Research Question | Suitable Model |
|---|---|
| Does P2RY2 mediate UTP-induced calcium release? | P2RY2 knockout cell line (e.g., HEK293) |
| Which residues determine UTP versus ATP selectivity? | Point mutations in P2RY2 ligand-binding pocket |
| Can a tagged P2Y2 receptor be used for imaging? | Knock-in of fluorescent tag (e.g., GFP) at P2RY2 locus |
| Does overexpression of P2Y2 enhance tumor growth? | P2RY2 overexpression in cancer cell lines |
| What is the role of P2Y2 dimerization? | Cysteine-to-serine point mutations to disrupt disulfide bridges |
| Does P2Y2 crosstalk with B2 bradykinin receptor? | Double knockout or co-immunoprecipitation in KO background |
How to Study the G protein-coupled UTP receptor activity Process
| Method | What It Measures | Typical Application |
|---|---|---|
| Calcium imaging | Intracellular calcium release | Functional readout of UTP receptor activation |
| GTPgammaS binding | G-protein activation | Pharmacological characterization in membranes |
| CRISPR knockout | Loss of receptor function | Causal testing of P2RY2 in disease models |
| Site-directed mutagenesis | Ligand selectivity and signaling | Mapping UTP binding site |
| Co-immunoprecipitation | Protein-protein interactions | Detecting P2Y2 dimers or heteromers |
| Fluorescence microscopy | Receptor localization and trafficking | Imaging tagged P2Y2 in live cells |
| qPCR | mRNA expression levels | Validating knockout or overexpression |
| Western blot | Protein expression and modifications | Confirming receptor knockdown or tagging |
Calcium mobilization assays
UTP receptor activity is commonly measured by monitoring intracellular calcium flux using fluorescent dyes such as Fluo-4 or genetically encoded calcium indicators. This method provides a real-time readout of Gq-mediated signaling and is suitable for high-throughput screening.
GTPgammaS binding
The binding of radiolabeled GTPgammaS to G proteins in membrane preparations is a direct measure of receptor-mediated G-protein activation. This assay has been used to characterize UTP-responsive receptors in lung membranes.
CRISPR knockout and knock-in
CRISPR/Cas9 can generate P2RY2 knockout cells to abolish UTP receptor activity, or knock-in of tags or point mutations to study receptor localization and function. These models enable causal testing of GO:0045030 in disease-relevant cells.
Biochemical and imaging approaches
Co-immunoprecipitation and Western blotting can detect P2Y2 dimerization and interactions with other proteins. Fluorescence microscopy of tagged receptors allows visualization of trafficking and internalization.
How CRISPR Can Be Used to Study GO:0045030 G protein-coupled UTP receptor activity
Knockout
CRISPR/Cas9-mediated knockout of P2RY2 eliminates UTP receptor activity, providing a clean background to test the contribution of GO:0045030 to cellular responses such as calcium mobilization and proliferation. Knockout cells can be used in disease models to assess the role of UTP signaling in inflammation or cancer.
Point Mutation
Point mutations introduced by CRISPR base editing or homology-directed repair can alter specific residues in the P2Y2 ligand-binding pocket, allowing dissection of UTP versus ATP selectivity and G-protein coupling. Such mutants help define the molecular determinants of GO:0045030.
Knock-in
Knock-in of fluorescent tags (e.g., GFP) or epitope tags at the endogenous P2RY2 locus enables real-time imaging of receptor trafficking and dimerization without overexpression artifacts. Knock-in of disease-associated mutations can model altered UTP receptor function.
Overexpression
Overexpression of P2RY2 in cell lines can amplify UTP-induced signaling, facilitating biochemical studies of downstream effectors and drug screening. However, overexpression may saturate signaling pathways, so results should be interpreted with caution.
How EDITGENE Supports G protein-coupled UTP receptor activity Research
Researchers studying G protein-coupled UTP receptor activity-related genes often need to determine whether a candidate gene is causally involved in UTP signaling or merely correlated with it. EDITGENE provides a comprehensive suite of CRISPR-based services to generate precisely engineered cell models, enabling rigorous functional validation of genes such as P2RY2 and its signaling partners.
Contact EDITGENE today to design your custom CRISPR model for G protein-coupled UTP receptor activity research.
Frequently Asked Questions About G protein-coupled UTP receptor activity
What is GO:0045030?
GO:0045030 is the Gene Ontology term for G protein-coupled UTP receptor activity, a molecular function where a receptor binds UTP and activates a heterotrimeric G-protein to initiate cellular signaling.
What genes are involved in G protein-coupled UTP receptor activity?
The primary gene is P2RY2, which encodes the P2Y2 receptor. Other genes include GNAQ, GNA11, PLCB1, and ITPR1, which mediate downstream signaling.
Which receptor is activated by UTP?
The P2Y2 receptor, encoded by P2RY2, is the prototypical receptor activated by UTP, although it also responds to ATP.
How is UTP receptor activity measured?
Common methods include calcium mobilization assays, GTPgammaS binding, and downstream reporter assays.
What diseases are associated with UTP receptors?
UTP receptor activity is implicated in airway inflammation, cancer progression, and cardiovascular disorders.
Can CRISPR be used to study UTP receptor function?
Yes, CRISPR knockout, point mutation, and knock-in models allow precise manipulation of P2RY2 and related genes to study UTP signaling.
What is the difference between P2Y2 and P2Y4 receptors?
Both can respond to UTP, but P2Y2 is also activated by ATP, while P2Y4 is more UTP-selective in some species.
Do UTP receptors form dimers?
Yes, P2Y2 receptors can form homodimers via disulfide bridges, which may affect their function.
What is the role of G proteins in UTP signaling?
UTP-activated receptors couple to Gq/11 proteins, which activate phospholipase C and lead to calcium release.
How can I create a P2RY2 knockout cell line?
EDITGENE provides custom CRISPR knockout services to generate P2RY2 knockout cell lines for functional studies.
Conclusion
G protein-coupled UTP receptor activity (GO:0045030) is a well-defined molecular function critical for extracellular nucleotide sensing and G-protein-mediated signaling. The P2Y2 receptor (P2RY2) serves as the primary gene product, and its activity is implicated in airway inflammation, cancer, and other diseases. Understanding the molecular mechanisms, regulation, and disease relevance of this activity requires robust experimental models, and CRISPR-based approaches offer powerful tools for causal interrogation. EDITGENE's services support researchers in generating knockout, point mutation, knock-in, and overexpression models to advance UTP receptor biology.
References
- 1. Abe M et al.. 2018. Homodimer formation by the ATP/UTP receptor P2Y2 via disulfide bridges.. J Biochem 163(6):475-480 PMID: 29361137
- 2. Yashima S et al.. 2015. Close association of B2 bradykinin receptors with P2Y2 ATP receptors.. J Biochem 158(2):155-63 PMID: 25713410
- 3. Laubinger W et al.. 1999. In human and rat lung membranes [35S]GTPgammaS binding is a tool for pharmacological characterization of G protein-coupled dinucleotide receptors.. Life Sci 65(14):PL183-90 PMID: 10530805
- 4. Dal Ben D et al.. 2011. The importance of alkynyl chain presence for the activity of adenine nucleosides/nucleotides on purinergic receptors.. Curr Med Chem 18(10):1444-63 PMID: 21428896
- 5. Conigrave AD et al.. 1995. Review: Ca(2+)-mobilizing receptors for ATP and UTP.. Cell Calcium 17(2):111-9 PMID: 7736560
- 6. Nguyen T et al.. 1995. Cloning, expression, and chromosomal localization of the human uridine nucleotide receptor gene.. J Biol Chem 270(52):30845-8 PMID: 8537335
