May play a role in membrane trafficking, specifically in membrane budding reactions. Binds STRN4 (By similarity). Interacts with DNM1 and EPS15 (By similarity). Interacts with nucleoside diphosphate kinase (By similarity). Binds STRN and STRN3. Part of a ternary complex containing MOB4/PHOCN, STRN and/or STRN3 and PPA2. Interacts with CTTNBP2 (By similarity). Interacts with CTTNBP2NL. In a perinuclear punctate pattern. Associated with membranes and the Golgi stacks. Phosphorylated on serine residues. Belongs to the MOB1/phocein family. Truncated N-terminus.