Promotes actin polymerization mediated by SNX9 and WASL. Homodimer (Probable). Interacts (via F-BAR domain) with SNX9 (via SH3 domain) (PubMed:23437151, PubMed:26567222). Interacts (via F-BAR domain) with SNX18 and SNX33 (PubMed:26567222). Interacts (via SH3 domain 1) with WASL (PubMed:29887380). Interacts (via SH3 domain 2) with ITSN1 (PubMed:29887380). Detected on neuronal cell bodies and cell projections, in part on cytoplasmic vesicles. Detected in inner ear vestibula and in the cuticular plate of cochlear hair cells (at protein level). Ubiquitous. Detected in testis, liver, brain cortex, cerebellum, spiral ganglion and tongue, and at lower levels in the organ of Corti and utricle in the inner ear. Detected in brain cortex at 15.5 dpc. Highly expressed in brain cortex from young and adult animals (at protein level). 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 (PubMed:23761074, PubMed:26567222).