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. Induces also a decrease in cell proliferation and angiotensin II-stimulated transcriptional activity (By similarity). Interacts with RACK1, and with the carboxy-terminal region of AGTR1. Present in perinuclear vesicular membranes, Endoplasmic reticulum, Golgi and endocytic vesicles.