2. Signaling Pathways
  3. GPCR/G Protein
  4. Orphan GPCR

Orphan GPCR

Rrphan G protein-coupled receptor

Orphan GPCRs (orphan G protein-coupled receptors) are receptors lacking endogenous ligands. GPCRs are th largest family of transmembrane receptors and have over the past decades developed into highly successful drug targets. However, many GPCRs are still orphans and the function is enigmatic. Orphan GPCRs account for ∼30% of the ∼400 non-olfactory human GPCRs. In terms of orphan GPCR ligands, initial efforts focused on identifying novel neuropeptides since orphan GPCR expression was located primarily in the brain. G protein coupling of unliganded orphan GPCRs—GPR22, GPR137b, GPR88, GPR156, GPR158, GPR179, GPRC5D and GPRC6A—with pathophysiological association were accurately detected using luciferase reporter assays[1][2].

Orphan GPCR Related Products (23):

Cat. No. Product Name Effect Purity Chemical Structure
  • HY-182270
    GPR61 Inverse agonist 2
    		Antagonist
    GPR61 Inverse agonist 2 is a selective GPR61 inverse agonist with human IC50 of 6.2 nM and mouse IC50 of 20 nM, human Ki of 0.21 nM, and mouse Ki of 0.72 nM. GPR61 Inverse agonist 2 binds to an induced intracellular allosteric pocket of GPR61, disrupts receptor-Gαs interactions, and abolishes GPR61 constitutive activity. GPR61 Inverse agonist 2 does not alter food intake or body weight in healthy mice. GPR61 Inverse agonist 2 can be used for the research of cachexia/sarcopenia.
    GPR61 Inverse agonist 2
  • HY-P991587
    SAR-446523
    		Inhibitor
    SAR-446523 is a humanized IgG1 monoclonal antibody inhibitor targeting GPRC5D. SAR-446523 significantly induces antibody-dependent cell-mediated cytotoxicity (ADCC). SAR-446523 has potent antitumor activity with improvement of mouse survival in NK humanized NOG huIL15 transgenic mice model bearing MM cells. SAR-446523 can be used for multiple myeloma (MM) research.
    SAR-446523
  • HY-159161
    PSB-CB-27
    		Inhibitor
    PSB-CB-27 is a potent and selective GPR18 inhibitor with an IC50 of 0.65 μM. PSB-CB-27 shows selectivity over Human GPR55, Human CB1 receptor, and Human CB2 receptor. PSB-CB-27 leads to a complete blockade of Δ9-Tetrahydrocannabinol (THC)-induced GPR18 activation. PSB-CB-27 can be used for inflammatory diseases and cancer immunotherapy research.
    PSB-CB-27