G-protein coupled receptor family C group 5 member D is a protein that in humans is encoded by the GPRC5Dgene.[5] GPRC5D is a class C orphan Gprotein-coupled receptor predominantly expressed in multiple myeloma cells and hard keratinized tissues, with low expression in normal human tissues, rendering it an appealing target for multiple myeloma cells.[6][7][8]
Structural analysis of the complex between GPRC5D and Talquetamab, a bispecific antibody for the treatment of multiple myeloma, has revealed that GPRC5D exists as a dimer. GPRC5D forms a symmetric dimer via TM4 and TM4/TM5 interactions. The study further demonstrated that only one Talquetamab molecule can bind to the dimeric form of GPRC5D. Talquetamab Fab recognizes ECLs and TM3/5/7 of one GPRC5D protomer via six CDRs. [9]
The protein encoded by this gene is a member of the G protein-coupled receptor family; however, the specific function of this gene has not yet been determined.[5]
Bräuner-Osborne H, Jensen AA, Sheppard PO, Brodin B, Krogsgaard-Larsen P, O'Hara P (April 2001). "Cloning and characterization of a human orphan family C G-protein coupled receptor GPRC5D". Biochimica et Biophysica Acta (BBA) - Gene Structure and Expression. 1518 (3): 237–248. doi:10.1016/s0167-4781(01)00197-x. PMID11311935.