Probable G-protein coupled receptor 133 is a protein that in humans is encoded by the GPR133 gene.[5][6]

AliasesADGRD1, PGR25, GPR133, adhesion G protein-coupled receptor D1 Quick facts ADGRD1, Identifiers ...
Close
This gene encodes a member of the adhesion-GPCR family of receptors. Family members are characterized by an extended extracellular region with a variable number of protein domains coupled to a TM7 domain via a domain known as the GPCR-Autoproteolysis INducing (GAIN) domain.[7][8]
GPR133 binds androgens, specifically the androgen 5α-dihydrotestosterone (5α-DHT).[9] GPR133 is an adhesion G protein-coupled receptor that functions as a membrane receptor for androgens. When activated by 5α-DHT, GPR133 increases intracellular cyclic AMP (cAMP) levels in muscle cells, leading to enhanced muscle strength.[9]
Agonists of GPR133 such as GL64 and AP503 have potential applications in the treatment of osteoporosis.[10][11]