Role of C-terminal cytoplasmic domain of the AT2 receptor in ligand binding and signaling

Abstract

A stop codon at position 322 was introduced to generate a truncated, C-terminal-deleted AT2 receptor. Expression studies in Xenopus oocytes showed that C-terminal-deleted AT2 had reduced affinity to [125I]angiotensin II (Kd=1.7 nM) and enhanced binding of the AT2-specific peptidic ligand [125I]CGP42112A (Kd=0.097 nM). AT2 activation by angiotensin II resulted in reduction of cGMP levels in oocytes and this reduction was further enhanced by C-terminal deletion, implying that the C-terminus may have a negative effect on the AT2-mediated cGMP reduction. Moreover, interaction of the AT2 with the ATP-binding domain of the human ErbB3 receptor in yeast two-hybrid assay was abolished by C-terminal deletion. In summary, the C-terminal cytoplasmic tail of AT2 modulates its ligand binding and signaling properties. © 2002 Federation of European Biochemical Societies. Published by Elsevier Science B.V. All rights reserved.