Promotes actin polymerization mediated by SNX9 and WASL. Homodimer. Interacts (via F-BAR domain) with SNX9 (via SH3 domain). Interacts (via F-BAR domain) with SNX18 and SNX33. Interacts (via SH3 domain 1) with WASL (By similarity). Interacts (via SH3 domain 2) with ITSN1 (PubMed:29887380). Detected on neuronal cell bodies and cell projections, in part on cytoplasmic vesicles. The F-BAR domain has an atypical, flat shape and binds preferentially to flat membranes (By similarity). Upon heterologous expression, the isolated F-BAR domain is localized at the cell membrane, and causes the formation of cellular protrusions (By similarity).