Plays an important role in regulating intracellular signaling events associated with erythroid terminal differentiation. Interacts (via ankyrin repeat region) with LYN (via SH3-domain) in an activation-independent status of LYN. Forms a multiprotein complex with LYN and HCLS1. Interacts with TSN2, VAV1, DBNL AND LASP1. Shuttles between nucleus and cytoplasm during the cell cycle.