Enables Ser-tRNA(Ala) hydrolase activity. Acts upstream of or within regulation of translational fidelity. Predicted to be located in cytoplasm. Is expressed in submandibular gland primordium. Orthologous to several human genes including PTGES3L-AARSD1 (PTGES3L-AARSD1 readthrough). [provided by Alliance of Genome Resources, Apr 2022]