Enables protein domain specific binding activity. Predicted to be involved in several processes, including positive regulation of intracellular signal transduction; positive regulation of protein phosphorylation; and regulation of actin cytoskeleton organization. Located in apical plasma membrane; clathrin-coated vesicle; and sarcoplasmic reticulum. Human ortholog(s) of this gene implicated in severe congenital neutropenia 3. Orthologous to human HAX1 (HCLS1 associated protein X-1). [provided by Alliance of Genome Resources, Apr 2022]