Binds to actin filaments (F-actin) and shows cross-linking activity. Binds along the sides of the F-actin. May be involved in neurite formation. Inhibits protein phosphatase 1-alpha activity (By similarity). Possibly exists as a homodimer, homotrimer or a homotetramer. Interacts with F-actin, protein phosphatase 1 (PP1), neurabin-2 and p70-S6K (By similarity). Interacts with p70-S6K via its PDZ domain. The PP1 binding region is natively unstructured, upon PP1 binding, it acquires structure, blocks a substrate-binding site, and restricts PP1 phosphatase specificity to a subset of substrates.