TGFα shedding assay: an accurate and versatile method for detecting GPCR activation

A G protein–coupled receptor (GPCR) signaling assay based on ectodomain shedding of a membrane-bound proform of alkaline phosphatase-tagged TGFα provides a platform for studying poorly characterized Gα12/13-coupled GPCRs. The assay allowed identification of three orphan GPCRs as Gα12/13-coupled lysophosphatidylserine receptors.