Predicted to enable tRNA binding activity. Predicted to be involved in selenocysteine incorporation. Is expressed in embryonic brain; larval ventral nerve cord; organism; and ventral nerve cord primordium. Human ortholog(s) of this gene implicated in pontocerebellar hypoplasia type 2D. Orthologous to human SEPSECS (Sep (O-phosphoserine) tRNA:Sec (selenocysteine) tRNA synthase).