GO:0031752 D5 dopamine receptor binding: Mechanism, Genes and Research Methods
Research-grade guide for scientists and biopharma professionals
Key Takeaways
• GO:0031752 (D5 dopamine receptor binding) is a molecular function defined as binding to a D5 dopamine receptor, with the synonym D1B dopamine receptor binding.
• The D5 dopamine receptor is encoded by DRD5 and is a D1-like receptor that stimulates adenylyl cyclase and cyclic AMP production.
• D5 dopamine receptor binding is studied with radioligands and MS binding assays, and ligands such as N-propylnorapomorphine derivatives can interact with D1-like receptors.
• DRD5 modulates tumor response to D2 receptor antagonism, linking D5 dopamine receptor binding to cancer biology.
• Dopamine receptor signaling, including D5-mediated pathways, is relevant to Parkinson's disease and other neurological disorders.
• CRISPR knockout, point mutation, knock-in, and overexpression models enable causal testing of DRD5 and its binding partners.
Description
GO:0031752, D5 dopamine receptor binding, is a molecular function term in the Gene Ontology that describes the binding of a molecule to a D5 dopamine receptor. The D5 dopamine receptor is a D1-like dopamine receptor encoded by the DRD5 gene, and it signals primarily through Gs-mediated activation of adenylyl cyclase, increasing cyclic AMP. This binding function is central to dopamine neurotransmission and to the pharmacological targeting of dopamine receptors in neurological and psychiatric conditions. Researchers study D5 dopamine receptor binding to understand receptor-ligand interactions, to develop selective compounds, and to dissect dopamine-dependent signaling in health and disease. Because the D5 receptor is a low-abundance D1-like receptor, binding assays and imaging probes are essential tools for its characterization.
D5 dopamine receptor binding At A Glance
| GO ID | GO:0031752 |
|---|---|
| GO term | D5 dopamine receptor binding |
| Ontology | molecular_function |
| Synonym | D1B dopamine receptor binding; D5 dopamine receptor ligand |
| Major function | Binding to a D5 dopamine receptor |
| Related receptor | D5 dopamine receptor (DRD5), a D1-like receptor |
| Signaling context | Gs-coupled cyclic AMP signaling |
| Research tools | Radioligands and MS binding assays |
What Is GO:0031752?
D5 dopamine receptor binding (GO:0031752) is the molecular function of selectively interacting with a D5 dopamine receptor, a D1-like dopamine receptor encoded by DRD5. The term is also known by the synonym D1B dopamine receptor binding and D5 dopamine receptor ligand. This function is distinct from binding to other dopamine receptor subtypes, although some ligands can cross-react with D1-like receptors.
Why Is D5 dopamine receptor binding Important in Cell Biology?
D5 dopamine receptor binding is important because it underlies the pharmacological and physiological control of D1-like dopamine receptor signaling, which regulates cyclic AMP and downstream neuronal responses. The D5 receptor is implicated in neurological and psychiatric disorders, and dopamine signaling is a major therapeutic target in Parkinson's disease. Moreover, DRD5 can modulate tumor responses to D2 receptor antagonism, indicating that D5 dopamine receptor binding has relevance beyond the nervous system.
• D5 dopamine receptor binding is a key molecular function for D1-like dopamine receptor pharmacology.
• DRD5 is a D1-like receptor that stimulates cyclic AMP production.
• Dopamine signaling, including D5 receptor pathways, is relevant to Parkinson's disease.
• D5 receptor binding can be probed with radiolabeled ligands and MS binding assays.
• DRD5 modulates tumor response to D2 receptor antagonism, linking it to cancer biology.
• Selective binding assays help distinguish D1-like receptor subtypes.
• D5 dopamine receptor binding is a target for neuroimaging and drug discovery.
• Understanding D5 binding supports the development of subtype-selective therapeutics.
Molecular Mechanism of D5 dopamine receptor binding
Ligand recognition by the D5 dopamine receptor
In simple terms: The D5 receptor has a binding pocket that recognizes dopamine and related molecules.
The D5 dopamine receptor is a G protein-coupled receptor encoded by DRD5, and its binding function involves recognition of dopamine or synthetic ligands within the receptor's orthosteric site. Binding to the D5 receptor is part of the broader dopamine receptor signaling system, where D1-like receptors couple to Gs and activate adenylyl cyclase. Ligands such as N-propylnorapomorphine derivatives can interact with D1-like receptors, and binding assays are used to measure these interactions.
Assay detection of D5 dopamine receptor binding
In simple terms: Scientists use binding assays to see whether a molecule sticks to the D5 receptor.
MS binding assays have been developed for D1 and D5 dopamine receptors, enabling direct quantification of ligand binding. Radiolabeled probes such as (R)-2-[(11)C]Methoxy-N-n-propylnorapomorphine and related compounds have been used to study dopamine receptor binding in vitro and in vivo. These assays help characterize affinity and selectivity at the D5 receptor.
Signal transduction following D5 receptor binding
In simple terms: Once a ligand binds, the D5 receptor turns on a signaling cascade inside the cell.
D5 dopamine receptor binding leads to activation of Gs-mediated signaling and increased cyclic AMP production, a hallmark of D1-like receptor function. This signaling can influence neuronal excitability and gene expression. Dopamine receptor signaling is central to motor and cognitive functions, and its dysregulation is linked to Parkinson's disease.
Modulation of D5 receptor binding in disease
In simple terms: In disease, the amount or activity of the D5 receptor can change, affecting how ligands bind.
DRD5 has been shown to modulate tumor response to D2 receptor antagonism, indicating that D5 receptor binding can influence therapeutic outcomes in cancer. In Parkinson's disease, dopaminergic signaling is disrupted, and dopamine receptor binding is a key area of investigation. These findings highlight the disease relevance of D5 dopamine receptor binding.
Key Genes Involved in GO:0031752 D5 dopamine receptor binding
The following genes and proteins are directly or indirectly involved in D5 dopamine receptor binding and its signaling context.
| Gene | Major Role | Research Relevance |
|---|---|---|
| DRD5 | Encodes the D5 dopamine receptor, the direct binding target | Core gene for GO:0031752 studies |
| DRD1 | Encodes the D1 dopamine receptor, a related D1-like receptor | Comparative binding assays |
| DRD2 | Encodes the D2 dopamine receptor, a D2-like receptor | Modulation of tumor response |
| GNAS | Encodes Gs alpha subunit, couples to D1-like receptors | Signal transduction studies |
| ADCY | Adenylyl cyclase family, produces cyclic AMP | Downstream signaling readout |
| PRKACA | Protein kinase A catalytic subunit, cyclic AMP effector | Pathway analysis |
| TH | Tyrosine hydroxylase, dopamine synthesis | Dopamine availability studies |
| SLC6A3 | Dopamine transporter, regulates dopamine levels | Neurotransmission models |
| COMT | Catechol-O-methyltransferase, dopamine degradation | Dopamine metabolism studies |
| MAOA | Monoamine oxidase A, dopamine degradation | Dopamine catabolism |
| MAOB | Monoamine oxidase B, dopamine degradation | Parkinson's disease models |
| SNCA | Alpha-synuclein, Parkinson's disease protein | Neurodegeneration models |
| LRRK2 | Leucine-rich repeat kinase 2, Parkinson's disease gene | Dopaminergic neuron studies |
| PRKN | Parkin, Parkinson's disease gene | Mitochondrial dysfunction models |
| PINK1 | PTEN-induced kinase 1, Parkinson's disease gene | Mitophagy studies |
| GCH1 | GTP cyclohydrolase 1, dopamine synthesis cofactor | Dopamine synthesis pathway |
How Is D5 dopamine receptor binding Regulated?
D5 dopamine receptor binding is regulated by the availability of dopamine and the expression level of DRD5, as well as by receptor desensitization mechanisms common to G protein-coupled receptors. Dopamine synthesis and degradation enzymes such as TH, COMT, and MAO influence ligand availability. In cancer, DRD5 expression can modulate responses to D2 receptor antagonism, suggesting that receptor expression levels regulate the functional impact of D5 binding.
D5 dopamine receptor binding and Human Disease
| Gene | Disease / Biology | Potential Experimental Model |
|---|---|---|
| DRD5 | Cancer response to D2 antagonism | DRD5 knockout cancer cell line |
| DRD5 | Parkinson's disease | DRD5 knockout dopaminergic neurons |
| DRD1 | Dopamine signaling in disease | DRD1/DRD5 double knockout |
| DRD2 | Tumor response modulation | DRD2 antagonist treatment in DRD5-expressing cells |
| SNCA | Parkinson's disease | SNCA overexpression models |
Parkinson's disease
Dopamine signaling is progressively lost in Parkinson's disease, and dopamine receptor binding is a major focus of research and therapy. The D5 receptor, as a D1-like receptor, contributes to dopaminergic neurotransmission, and its binding properties are relevant to understanding disease mechanisms.
Cancer
DRD5 has been identified as a modulator of tumor response to dopamine receptor D2 antagonism, linking D5 dopamine receptor binding to cancer therapeutic outcomes. This suggests that D5 receptor expression and binding may influence the efficacy of dopamine-targeting drugs in oncology.
Neuropsychiatric disorders
Dopamine receptor signaling, including D1-like receptor pathways, is implicated in neuropsychiatric conditions, and D5 receptor binding is studied in this context. Selective ligands and binding assays are used to probe D5 receptor function in these disorders.
From D5 dopamine receptor binding-Related Genes to Experimental Models
| Research Question | Suitable Model |
|---|---|
| Does DRD5 loss alter dopamine binding? | DRD5 knockout cell line |
| Does a point mutation in DRD5 affect ligand affinity? | DRD5 point-mutation knock-in |
| Can a tagged DRD5 be used for binding assays? | Tagged DRD5 knock-in |
| Does DRD5 overexpression change cyclic AMP signaling? | DRD5 overexpression cell line |
| Does DRD5 modulate tumor response to D2 antagonists? | DRD5 knockout cancer cells |
| Does DRD5 binding affect neuronal function? | DRD5 knockout neurons |
How to Study the D5 dopamine receptor binding Process
| Method | What It Measures | Typical Application |
|---|---|---|
| MS binding assay | Ligand binding to D1/D5 receptors | Affinity and selectivity profiling |
| Radioligand binding | Receptor occupancy and affinity | In vitro and in vivo imaging |
| Cyclic AMP assay | Gs-mediated signaling | Functional activation of D1-like receptors |
| CRISPR knockout | Loss of DRD5 function | Causal testing of D5 binding |
| CRISPR knock-in | Tagged or mutant DRD5 | Binding site analysis |
| Overexpression | Increased DRD5 levels | Signaling gain-of-function |
| Immunofluorescence | Receptor localization | Cellular distribution studies |
| RNA-seq | Transcriptional changes | Pathway analysis after DRD5 manipulation |
MS binding assays
MS binding assays have been developed for D1 and D5 dopamine receptors, allowing direct quantification of ligand-receptor interactions without radiolabels. These assays are useful for determining affinity and selectivity at the D5 receptor.
Radioligand binding assays
Radiolabeled compounds such as (R)-2-[(11)C]Methoxy-N-n-propylnorapomorphine and related ligands have been used to study dopamine receptor binding. These assays enable in vitro and in vivo imaging of receptor occupancy.
Cyclic AMP signaling assays
Because D1-like receptors couple to Gs and stimulate cyclic AMP, measuring cyclic AMP levels can report on D5 receptor activation after ligand binding. This is a standard readout for D1-like receptor function.
Genetic manipulation and imaging
CRISPR knockout, knock-in, and overexpression models can be combined with imaging and biochemical assays to study D5 dopamine receptor binding in cells and tissues. These approaches help link binding events to downstream cellular responses.
How CRISPR Can Be Used to Study GO:0031752 D5 dopamine receptor binding
Knockout
CRISPR knockout of DRD5 can eliminate D5 dopamine receptor binding, enabling researchers to test the receptor's contribution to cyclic AMP signaling and disease phenotypes. Knockout models are particularly useful for validating the role of DRD5 in tumor response to D2 antagonism.
Point Mutation
Point mutations in DRD5 can be introduced to dissect the ligand-binding pocket and to test how specific residues affect D5 dopamine receptor binding. Such models help distinguish binding determinants from downstream signaling domains.
Knock-in
Knock-in of tagged or reporter DRD5 alleles allows direct visualization and biochemical isolation of the D5 receptor, facilitating binding assays and localization studies. This approach can also be used to express disease-associated variants.
Overexpression
Overexpression of DRD5 increases receptor density, which can amplify binding signals and downstream cyclic AMP responses. Overexpression models are useful for pharmacological profiling of D5-selective ligands.
How EDITGENE Supports D5 dopamine receptor binding Research
Researchers studying D5 dopamine receptor binding-related genes often need to determine whether a candidate gene is causally involved in receptor function, signaling, or disease phenotypes. EDITGENE provides CRISPR-based cell models and screening services to enable these investigations with high specificity and reproducibility.
Contact EDITGENE today to design your custom CRISPR model for D5 dopamine receptor binding research.
Frequently Asked Questions About D5 dopamine receptor binding
What is GO:0031752?
GO:0031752 is the Gene Ontology molecular function term for D5 dopamine receptor binding, defined as binding to a D5 dopamine receptor.
What genes are involved in D5 dopamine receptor binding?
The primary gene is DRD5, which encodes the D5 dopamine receptor; related genes include DRD1, GNAS, and ADCY.
What is the D5 dopamine receptor?
The D5 dopamine receptor is a D1-like G protein-coupled receptor encoded by DRD5 that stimulates cyclic AMP production.
How is D5 dopamine receptor binding measured?
It can be measured using MS binding assays, radioligand binding assays, and cyclic AMP signaling assays.
Is D5 dopamine receptor binding involved in disease?
Yes, it is linked to Parkinson's disease and cancer, where DRD5 modulates tumor response to D2 antagonism.
What are the synonyms for GO:0031752?
The synonyms are D1B dopamine receptor binding and D5 dopamine receptor ligand.
What is the difference between D1 and D5 dopamine receptors?
Both are D1-like receptors that couple to Gs and stimulate cyclic AMP, but they are encoded by different genes, DRD1 and DRD5.
Can CRISPR be used to study D5 dopamine receptor binding?
Yes, CRISPR knockout, point mutation, knock-in, and overexpression models can be used to study DRD5 function and binding.
What ligands bind to the D5 dopamine receptor?
Dopamine and synthetic ligands such as N-propylnorapomorphine derivatives can bind D1-like receptors, including D5.
Why is D5 dopamine receptor binding important for drug discovery?
It is a target for developing subtype-selective drugs for neurological and psychiatric disorders and for modulating tumor responses.
Conclusion
D5 dopamine receptor binding (GO:0031752) is a molecular function that governs the interaction of ligands with the D5 dopamine receptor, a D1-like receptor encoded by DRD5. This function is central to dopamine signaling, with relevance to Parkinson's disease and cancer. Advances in binding assays and CRISPR models continue to clarify the mechanisms and therapeutic potential of targeting D5 dopamine receptor binding.
References
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- 2. Neve KA et al.. 2004. Dopamine receptor signaling.. J Recept Signal Transduct Res 24(3):165-205 PMID: 15521361
- 3. Leung K. 2004. (+/-)-2-(N-Phenethyl-N-1'-[(11)C]propyl)amino-5-hydroxytetralin.. PMID: 20641291
- 4. Neiens P et al.. 2015. MS Binding Assays for D1 and D5 Dopamine Receptors.. ChemMedChem 10(11):1924-31 PMID: 26332653
- 5. Leung K. 2004. (R)-2-[(11)C]Methoxy-N-n-propylnorapomorphine.. PMID: 20641879
- 7. Prabhu VV et al.. 2019. Dopamine Receptor D5 is a Modulator of Tumor Response to Dopamine Receptor D2 Antagonism.. Clin Cancer Res 25(7):2305-2313 PMID: 30559168
- 8. Leung K. 2004. (R)-(-)-2-Chloro-N-[1-(11)C-propyl]n-propylnorapomorphine.. PMID: 21204317
