May be involved in G protein-linked signaling. Interacts with SDC4/syndecan-4 and SEMA4C/semaphorin-4C (By similarity). Interacts with RGS19 (C-terminus), GLUT1 (C-terminus), ACTN1, KIF1B, MYO6 and PLEKHG5. Widely expressed. Belongs to the GIPC family.