Is predicted to encode a protein with the following domains: EF-hand domain pair; Cytoskeletal-regulatory complex EF hand; EH domain; SH3-like domain superfamily; Variant SH3 domain; and SH3 domain. Is an ortholog of C. elegans itsn-1. In C. elegans, itsn-1 is involved in positive regulation of synaptic vesicle endocytosis.