Heterodimer with MPP1. Interacts with MPP7. Forms a complex with CRB1 and MPP4. Component of a complex whose core is composed of ARHGAP17, AMOT, MPP5/PALS1, INADL/PATJ and PARD3/PAR3 (By similarity). Interacts with CRB3, EZR, INADL, LIN7C, MPDZ, PARD6B and SC6A1.