Enables identical protein binding activity and protein dimerization activity. Involved in several processes, including actomyosin contractile ring assembly; bicellular tight junction assembly; and maintenance of epithelial cell apical/basal polarity. Located in actomyosin; cytosol; and extracellular exosome. Is expressed in hindgut; midgut; rectum; and thymus primordium. Orthologous to human PDCD6IP (programmed cell death 6 interacting protein). [provided by Alliance of Genome Resources, Apr 2022]