Enables RNA binding activity and calcium ion binding activity. Acts upstream of or within several processes, including in utero embryonic development; liver development; and negative regulation of neuron projection development. Part of glucosidase II complex. Is expressed in several structures, including brain; cardiovascular system; genitourinary system; gut; and hemolymphoid system gland. Used to study polycystic liver disease. Human ortholog(s) of this gene implicated in liver disease and polycystic liver disease. Orthologous to human PRKCSH (protein kinase C substrate 80K-H). [provided by Alliance of Genome Resources, Apr 2022]