Appears to be a negative regulator of type-1 angiotensin II receptor-mediated signaling by regulating receptor internalization as well as mechanism of receptor desensitization such as phosphorylation. May play a role of negative regulator in cardiomyocyte hypertrophy induced by angiotensin II through an inhibition of p38 mitogen-activated protein kinase pathway. Attenuates type-1 angiotensin II receptor growth promoting effect and angiotensin II-induced phosphorylation of protein kinase AKT and of STAT3. Interacts with RACK1, and with the carboxy-terminal region of AGTR1. Present in perinuclear vesicular membranes, Endoplasmic reticulum, Golgi and endocytic vesicles.