Acts as a regulator of endocytic traffic by participating in membrane delivery. Required for the abcission step in cytokinesis, possibly by acting as an 'address tag' delivering recycling endosome membranes to the cleavage furrow during late cytokinesis. In case of infection by HCMV (human cytomegalovirus), may participate in egress of the virus out of nucleus; this function is independent of ARF6. Homodimer. Forms a complex with Rab11 (RAB11A or RAB11B) and ARF6. Interacts with RAB11A; the interaction is direct. Forms a heterooligomeric complex with RAB11FIP2, RAB11FIP3 and RAB11FIP5. Interacts with ECPAS. (Microbial infection) Interacts with human cytomegalovirus/HHV-5 protein gM/UL100. Recruited to the cleavage furrow and the midbody during cytokinesis. Present at high level in testis (at protein level). Weakly expressed in other tissues. The RBD-FIP domain mediates the interaction with Rab11 (RAB11A or RAB11B).