Predicted to enable small GTPase binding activity. Predicted to be involved in several processes, including Golgi ribbon formation; endoplasmic reticulum to Golgi vesicle-mediated transport; and vesicle tethering to Golgi. Predicted to act upstream of or within several processes, including chondrocyte differentiation involved in endochondral bone morphogenesis; inner ear receptor cell stereocilium organization; and ventricular septum development. Located in inner acrosomal membrane and outer acrosomal membrane. Human ortholog(s) of this gene implicated in achondrogenesis type IA. Orthologous to human TRIP11 (thyroid hormone receptor interactor 11); INTERACTS WITH 17beta-estradiol; 2,3,7,8-tetrachlorodibenzodioxine; bisphenol A.