May regulate a number of protein-protein interactions by competing for PDZ domain binding sites. Binds CTNNB1 and may thereby act as an inhibitor of the Wnt signaling pathway. Competes with LIN7A for KCNJ4 binding, and thereby promotes KCNJ4 internalization. May play a role in the Rho signaling pathway (By similarity). Interacts (via its PDZ domain) with GLS2. Interacts (via its PDZ domain) with RTKN (via the C-terminal region); this interaction facilitates Rho-mediated activation of the FOS serum response element (SRE). Interacts (via PDZ domain) with ARHGEF16. Interacts (via PDZ domain) with KCNJ4 (via C-terminus). Competes with LIN7A for KCNJ4 binding (By similarity). Interacts (via its PDZ domain) with CTNNB1; this interaction inhibits the transcriptional activity of CTNNB1. Interacts with ADGRB2 (By similarity). Recruited to the cell membrane by interaction with membrane proteins.