Enables 2'-5'-oligoadenylate synthetase activity and double-stranded RNA binding activity. Involved in defense response to virus; regulation of lactation; and type I interferon signaling pathway. Acts upstream of or within RNA catabolic process; interleukin-27-mediated signaling pathway; and response to bacterium. Predicted to be located in perinuclear region of cytoplasm. Predicted to be active in cytosol; membrane; and nucleoplasm. Is expressed in embryo. Orthologous to human OAS2 (2'-5'-oligoadenylate synthetase 2). [provided by Alliance of Genome Resources, Apr 2022]