Overview
Orexin receptors (OX1R and OX2R) are G protein-coupled receptors activated by neuropeptides orexin-A and orexin-B. Discovered in 1998, they are primarily expressed in the central nervous system and modulate arousal, feeding behavior, and reward pathways. Dysregulation is linked to narcolepsy and metabolic disorders. These receptors are targets for pharmaceuticals, particularly sleep aids like suvorexant (Belsomra), which block OX1R/OX2R to induce sleep. Research also explores their role in addiction and obesity, making them significant in neuroscience and drug development.
Physical and Chemical Properties
Orexin receptors are integral membrane proteins with seven transmembrane domains. They exhibit high affinity for orexin peptides (Kd ~1-10 nM) and signal via Gq, Gi/o, or β-arrestin pathways. The receptors are water-soluble when extracted with detergents but require lipid membranes for native functionality. Stability varies: OX1R degrades faster than OX2R at room temperature. For lab use, lyophilized forms are stable at -20°C but reconstituted samples should be used immediately or stored short-term at 4°C with protease inhibitors.
Main Applications
1. **Sleep Disorder Therapeutics**: Dual orexin receptor antagonists (DORAs) treat insomnia by selectively blocking OX1R/OX2R. 2. **Neurological Research**: Studies explore orexin's role in Parkinson’s disease and epilepsy. 3. **Metabolic Studies**: Receptor knockout models help investigate obesity mechanisms. Biotech firms supply recombinant orexin receptors for high-throughput screening of drug candidates. Diagnostic kits using receptor-binding assays are under development for narcolepsy biomarkers.
Safety and Storage
Recombinant orexin receptors require handling in BSL-1 labs. Use PPE to prevent endotoxin contamination. Lyophilized powder is stable for 2 years at -20°C; avoid freeze-thaw cycles for liquid samples. For functional assays, maintain pH 7.4 and include 0.1% BSA to prevent adhesion. Dispose of waste via autoclaving or chemical inactivation (e.g., 1% SDS solution).
B2B Procurement Guide
When sourcing orexin receptors, prioritize suppliers with: 1. **Certification**: ISO 13485 for diagnostic-grade materials. 2. **Documentation**: COA detailing purity (SDS-PAGE/Coomassie), endotoxin levels (<1 EU/μg), and functional activity (e.g., calcium flux assay data). Bulk orders (10+ mg) may reduce costs by 15-30%. Consider contract research organizations (CROs) for custom receptor mutagenesis or labeling services. Lead times average 4-6 weeks for GMP-grade products.
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