G protein-coupled receptor 37 (endothelin receptor type B-like) (GPR37) is an Orphan-A GPCR with an unknown ligand. GPR37 was recently identified as the PAEL receptor, a Parkin substrate involved in autosomal recessive juvenile Parkinson's (PDJ) disease. The PAEL receptor becomes unfolded, insoluble, and ubiquitinated when overexpressed, leading to unfolded protein-induced cell death. GPR37 is ubiquitinated by Parkin, it gets degraded, resulting in the suppression of cell death. The insoluble form of the PAEL receptor accumulates in the brains of PDJ patients and may cause selective neuronal death. References: Journal of Cell Science 2016 129: 1366-1377; doi: 10.1242/jcs.176115