Subtype-specific sorting of the ETA endothelin receptor by a novel endocytic recycling signal for G protein-coupled receptors.

We have previously reported that endocytic sorting of ET(A) endothelin receptors to the recycling pathway is dependent on a signal residing in the cytoplasmic carboxyl-terminal region. The aim of the present work was to characterize the carboxyl-terminal recycling motif of the ET(A) receptor. Assay of truncation mutants of the ET(A) receptor with increasing deletions of the carboxyl-terminal tail revealed that amino acids 390 to 406 contained information critical for the ability of the receptor to recycle.