GO:0031854 orexigenic neuropeptide QRFP receptor binding: Mechanism, Genes and Research Methods
Research-grade guide for scientists and biopharma professionals
Key Takeaways
• GO:0031854 describes the molecular function of binding to an orexigenic neuropeptide QRFP receptor, a key interaction in hypothalamic feeding circuits.
• QRFP (also known as pyroglutamylated RFamide peptide) acts as a ligand for the QRFP receptor (QRFPR/GPR103), influencing food intake and energy homeostasis.
• Central administration of QRFP-26 increases food intake and fat selection in rodents, highlighting its orexigenic role.
• QRFP signaling regulates the expression of corticotropin-releasing factor (CRF) in hypothalamic cells, linking it to stress and metabolic responses.
• QRFP is also involved in early testicular development and Sertoli cell maturation in prepubertal mice, suggesting broader physiological roles beyond feeding.
• Studying GO:0031854 requires tools like CRISPR knockout, knock-in, and overexpression models to dissect ligand-receptor interactions and downstream effects.
Description
GO:0031854, orexigenic neuropeptide QRFP receptor binding, is a molecular function term that defines the binding of the orexigenic neuropeptide QRFP to its receptor. This interaction is critical for understanding how the brain regulates appetite and energy balance. QRFP, a member of the RFamide peptide family, is produced in the hypothalamus and acts on the QRFP receptor (QRFPR) to stimulate food intake. The term captures the initial step of ligand-receptor recognition that triggers downstream signaling cascades. Researchers study this function to elucidate mechanisms of feeding behavior, metabolic disorders, and potential therapeutic targets. The binding event is specific and saturable, reflecting a classic neuropeptide-receptor interaction. Given the rising interest in central control of metabolism, GO:0031854 provides a precise annotation for functional genomics and drug discovery.
orexigenic neuropeptide QRFP receptor binding At A Glance
| GO ID | GO:0031854 |
|---|---|
| GO term | orexigenic neuropeptide QRFP receptor binding |
| Ontology | molecular_function |
| Synonym | orexigenic neuropeptide QRFP receptor ligand |
| Major function | Binding to the QRFP receptor to modulate feeding and energy homeostasis |
| Related ligand | QRFP (pyroglutamylated RFamide peptide) |
| Related receptor | QRFPR (GPR103) |
| Physiological role | Stimulation of food intake and fat selection |
| Research relevance | Target for obesity and metabolic disorder studies |
What Is GO:0031854?
In our own words, GO:0031854 refers to the molecular function of selectively binding to an orexigenic neuropeptide QRFP receptor. It describes the interaction between the QRFP ligand and its receptor, which is a prerequisite for receptor activation and subsequent intracellular signaling. This term is used to annotate gene products that physically interact with the QRFP receptor, typically the QRFP peptide itself or synthetic analogs.
Why Is orexigenic neuropeptide QRFP receptor binding Important in Cell Biology?
Understanding GO:0031854 is important because the QRFP-QRFPR system is a key regulator of appetite and energy balance. Dysregulation of this binding interaction has been implicated in obesity and metabolic syndrome. Moreover, QRFP signaling influences the hypothalamic-pituitary-adrenal axis by regulating CRF expression, linking metabolism with stress responses. The term also has developmental significance, as QRFP plays a role in testicular development. Thus, GO:0031854 provides a molecular handle to study these diverse physiological processes and to develop targeted therapies.
• Regulates food intake and fat selection in rodents.
• Modulates corticotropin-releasing factor (CRF) gene expression in hypothalamic cells.
• Involved in early testicular development and Sertoli cell maturation.
• Potential target for anti-obesity therapeutics.
• Links central nervous system control of metabolism with reproductive biology.
• Provides a model for studying neuropeptide-receptor interactions.
• Relevant to understanding stress-related eating disorders.
• Enables functional annotation of genes in feeding circuits.
• Supports drug discovery for metabolic diseases.
• Facilitates comparative studies across species.
Molecular Mechanism of orexigenic neuropeptide QRFP receptor binding
Ligand Recognition and Binding
In simple terms: QRFP peptide docks onto its receptor like a key in a lock.
The binding of QRFP to its receptor QRFPR is a specific interaction that initiates signaling. QRFP is a 26-amino acid peptide with a pyroglutamylated N-terminus and an RFamide motif at the C-terminus. This structure is essential for receptor recognition. Studies show that direct administration of QRFP-26 into the medial hypothalamic area increases food intake, confirming the functional relevance of this binding.
Receptor Activation and Signaling
In simple terms: Once bound, the receptor sends signals inside the cell to change its behavior.
QRFPR is a G protein-coupled receptor (GPCR). Upon QRFP binding, it activates Gq/11-mediated signaling, leading to increased intracellular calcium and activation of downstream pathways. This signaling ultimately modulates neuronal activity in hypothalamic feeding centers. The binding event is the first step in a cascade that affects gene expression, such as CRF.
Regulation of Feeding Behavior
In simple terms: This binding tells the brain to eat more and prefer fats.
Central QRFP administration promotes food intake and fat selection in rats. This orexigenic effect is mediated by QRFP receptor binding in the hypothalamus. The binding affinity and receptor availability can influence the magnitude of the feeding response. Thus, GO:0031854 is directly linked to behavioral outcomes.
Role in Neuroendocrine and Developmental Processes
In simple terms: QRFP binding also affects stress hormones and testis development.
Beyond feeding, QRFP binding regulates CRF gene expression in hypothalamic 4B cells, linking to stress responses. Additionally, QRFP is expressed in the testis and may influence Sertoli cell maturation during prepubertal development. These findings expand the functional repertoire of GO:0031854 beyond appetite control.
Key Genes Involved in GO:0031854 orexigenic neuropeptide QRFP receptor binding
The following genes and proteins are central to the study of orexigenic neuropeptide QRFP receptor binding.
| Gene | Major Role | Research Relevance |
|---|---|---|
| QRFP | Encodes the orexigenic neuropeptide QRFP ligand | Ligand for QRFPR; regulates food intake |
| QRFPR (GPR103) | Encodes the QRFP receptor | Mediates QRFP signaling; target for metabolic studies |
| CRH | Encodes corticotropin-releasing factor | Regulated by QRFP in hypothalamic cells |
| GNAQ | G protein alpha q subunit | Mediates QRFPR signaling |
| GNA11 | G protein alpha 11 subunit | Mediates QRFPR signaling |
| POMC | Pro-opiomelanocortin | Anorexigenic peptide; counterbalances QRFP |
| NPY | Neuropeptide Y | Orexigenic peptide; co-regulates feeding |
| AGRP | Agouti-related peptide | Orexigenic peptide; interacts with QRFP pathways |
| LEPR | Leptin receptor | Modulates feeding circuits including QRFP |
| MC4R | Melanocortin 4 receptor | Downstream of leptin; interacts with QRFP |
| SOX9 | Sertoli cell marker | Co-expressed with QRFP in testis |
| AMH | Anti-Mullerian hormone | Sertoli cell function; related to QRFP |
| FSHR | Follicle-stimulating hormone receptor | Sertoli cell maturation; linked to QRFP |
| GNRHR | Gonadotropin-releasing hormone receptor | Reproductive axis; potential crosstalk |
| KISS1R | Kisspeptin receptor | Reproductive neuroendocrine; comparative |
| GPR54 | Kisspeptin receptor | Reproductive neuroendocrine; comparative |
| TAC3 | Tachykinin 3 | Hypothalamic regulator; potential interaction |
| CART | Cocaine- and amphetamine-regulated transcript | Anorexigenic; counterbalances QRFP |
How Is orexigenic neuropeptide QRFP receptor binding Regulated?
The expression and activity of QRFP and its receptor are regulated at multiple levels. In hypothalamic 4B cells, QRFP regulates CRF gene expression, indicating a feedback loop. Nutritional status influences QRFP mRNA levels, with fasting increasing hypothalamic QRFP expression. Hormones such as leptin and insulin may modulate QRFP signaling. Additionally, developmental stage affects QRFP expression in the testis. However, the precise molecular regulators of GO:0031854 remain an active area of research.
orexigenic neuropeptide QRFP receptor binding and Human Disease
| Gene | Disease / Biology | Potential Experimental Model |
|---|---|---|
| QRFP | Obesity | QRFP knockout mouse |
| QRFPR | Metabolic syndrome | QRFPR knockout rat |
| CRH | Stress disorders | CRH promoter reporter in hypothalamic cells |
| SOX9 | Testicular dysgenesis | Sertoli cell-specific QRFP knockout |
| LEPR | Leptin resistance | Leptin-deficient ob/ob mice with QRFP manipulation |
Obesity and Metabolic Syndrome
Dysregulation of QRFP-QRFPR binding may contribute to obesity. Central QRFP administration increases food intake and fat selection, suggesting that overactive signaling could promote weight gain. Conversely, blocking this interaction might reduce appetite. Thus, GO:0031854 is a potential therapeutic target for obesity.
Stress-Related Disorders
QRFP regulates CRF expression in hypothalamic cells, linking it to stress responses. Altered QRFP signaling could affect stress-related eating behaviors and mood disorders. This connection highlights the importance of GO:0031854 in neuroendocrine regulation.
Reproductive Development
QRFP is expressed in the testis and may influence Sertoli cell maturation. Disruption of QRFP signaling could impact male fertility. Therefore, GO:0031854 may have implications for reproductive disorders.
From orexigenic neuropeptide QRFP receptor binding-Related Genes to Experimental Models
| Research Question | Suitable Model |
|---|---|
| Does QRFP binding affect food intake? | QRFP knockout mouse |
| What is the role of QRFPR in energy balance? | QRFPR knockout rat |
| How does QRFP regulate CRF expression? | Hypothalamic 4B cells with QRFP overexpression |
| Does QRFP influence testicular development? | Prepubertal mouse Sertoli cell-specific knockout |
| Can QRFP analogs treat obesity? | Knock-in mouse expressing humanized QRFPR |
| What are downstream signaling events? | Tagged QRFPR knock-in for live imaging |
How to Study the orexigenic neuropeptide QRFP receptor binding Process
| Method | What It Measures | Typical Application |
|---|---|---|
| CRISPR knockout | Loss of gene function | Phenotypic analysis of feeding behavior |
| Knock-in | Tagged protein expression | Live imaging of receptor localization |
| Overexpression | Gain of function | Studying excess ligand effects |
| Radioligand binding | Binding affinity | Characterizing QRFP-QRFPR interaction |
| RNA-seq | Transcriptional changes | Identifying downstream targets like CRF |
| Proteomics | Protein expression changes | Mapping signaling networks |
| Calcium imaging | Intracellular calcium flux | Measuring receptor activation |
CRISPR Knockout Studies
CRISPR-Cas9 knockout of QRFP or QRFPR in rodent models can reveal loss-of-function phenotypes related to feeding and metabolism. These models help establish causality between GO:0031854 and physiological outcomes.
Overexpression and Knock-in Models
Overexpressing QRFP in hypothalamic neurons or knocking in tagged receptors allows researchers to track binding and signaling in vivo. Such models are valuable for studying real-time dynamics.
Biochemical Binding Assays
Radioligand binding assays and surface plasmon resonance can measure the affinity and kinetics of QRFP-QRFPR interaction, providing quantitative data for GO:0031854.
Transcriptomic and Proteomic Profiling
RNA-seq and proteomics after QRFP stimulation can identify downstream targets and pathways, such as CRF regulation. These methods link the binding event to cellular responses.
How CRISPR Can Be Used to Study GO:0031854 orexigenic neuropeptide QRFP receptor binding
Knockout
CRISPR knockout of QRFP or QRFPR in mice or rats can abolish the binding interaction, leading to reduced food intake and altered fat preference. These models are essential for validating the orexigenic role of GO:0031854.
Point Mutation
Introducing point mutations in the QRFP peptide or its receptor can disrupt specific binding residues, allowing structure-function analysis of GO:0031854. Such models help identify critical amino acids for ligand recognition.
Knock-in
Knock-in of a fluorescently tagged QRFPR or QRFP enables real-time tracking of binding and trafficking in vivo. This approach provides spatial and temporal resolution of the interaction.
Overexpression
Overexpressing QRFP in hypothalamic neurons using CRISPR activation or transgenic approaches can mimic hyperphagia and obesity, offering a model to test therapeutics targeting GO:0031854.
How EDITGENE Supports orexigenic neuropeptide QRFP receptor binding Research
Researchers studying orexigenic neuropeptide QRFP receptor binding-related genes often need to determine whether a candidate gene is causally involved in feeding behavior, metabolic regulation, or neuroendocrine function. EDITGENE provides comprehensive CRISPR-based services to accelerate this research.
Contact EDITGENE today to design your custom CRISPR model for orexigenic neuropeptide QRFP receptor binding research.
Frequently Asked Questions About orexigenic neuropeptide QRFP receptor binding
What is GO:0031854?
GO:0031854 is the molecular function of binding to an orexigenic neuropeptide QRFP receptor, as defined by the Gene Ontology.
What genes are involved in orexigenic neuropeptide QRFP receptor binding?
Key genes include QRFP (ligand) and QRFPR (receptor), as well as downstream effectors like CRH.
How does QRFP affect food intake?
QRFP binding to its receptor in the hypothalamus increases food intake and fat selection in rodents.
What is the role of QRFP in testicular development?
QRFP is expressed in the testis and may influence Sertoli cell maturation during prepubertal development.
Can QRFP be targeted for obesity treatment?
Yes, blocking QRFP-QRFPR binding is a potential strategy to reduce appetite and treat obesity.
What cell models are used to study QRFP receptor binding?
Hypothalamic 4B cells and various knockout/knock-in rodent models are commonly used.
How does QRFP regulate CRF expression?
QRFP stimulates CRF gene expression in hypothalamic 4B cells, linking metabolism to stress responses.
What are the downstream signaling pathways of QRFPR?
QRFPR activates Gq/11-mediated calcium signaling and downstream kinases.
Is QRFP conserved across species?
QRFP and its receptor are found in mammals, with similar orexigenic effects observed in rats and mice.
What CRISPR models are available for QRFP research?
EDITGENE offers knockout, point mutation, knock-in, and overexpression models for QRFP and QRFPR.
Conclusion
GO:0031854, orexigenic neuropeptide QRFP receptor binding, is a fundamental molecular function that underlies the regulation of feeding, energy balance, and neuroendocrine processes. Through the interaction of QRFP with its receptor QRFPR, this binding event triggers signaling cascades that influence food intake, fat selection, stress responses, and even testicular development. Continued research using advanced CRISPR models will further elucidate its mechanisms and therapeutic potential.
References
- 1. Ishigame N et al.. 2016. Regulation of the expression of corticotropin-releasing factor gene by pyroglutamylated RFamide peptide in rat hypothalamic 4B cells.. Endocr J 63(10):919-927 PMID: 27452579
- 2. Zagorácz O et al.. 2015. Effects of direct QRFP-26 administration into the medial hypothalamic area on food intake in rats.. Brain Res Bull 118:58-64 PMID: 26385088
- 3. Patel SK et al.. 2022. Pyroglutamylated RFamide peptide (QRFP): Role in early testicular development in relation to Sertoli cell maturation in prepubertal mice.. Neuropeptides 91:102215 PMID: 34883413
- 4. Primeaux SD et al.. 2013. Hypothalamic QRFP: regulation of food intake and fat selection.. Horm Metab Res 45(13):967-74 PMID: 23979792
