Enables neurexin family protein binding activity. Involved in exocytosis and positive regulation of mucus secretion. Acts upstream of or within protein localization to plasma membrane. Located in melanosome and plasma membrane. Is extrinsic component of plasma membrane. Is expressed in several structures, including genitourinary system; heart; liver; lung; and spleen. Orthologous to human SYTL2 (synaptotagmin like 2). [provided by Alliance of Genome Resources, Apr 2022]