Enables protein serine/threonine kinase activity. Acts upstream of or within negative regulation of extrinsic apoptotic signaling pathway in absence of ligand. Located in cytoplasmic vesicle. Is expressed in several structures, including alimentary system; brain; genitourinary system; respiratory system; and sensory organ. Orthologous to several human genes including C8orf44-SGK3 (C8orf44-SGK3 readthrough). [provided by Alliance of Genome Resources, Apr 2022]