Enables cAMP-dependent protein kinase inhibitor activity and protein kinase A catalytic subunit binding activity. Acts upstream of or within negative regulation of nitrogen compound metabolic process; negative regulation of protein import into nucleus; and regulation of G2/M transition of mitotic cell cycle. Located in cytoplasm and nucleus. Is expressed in several structures, including alimentary system; central nervous system; genitourinary system; integumental system; and sensory organ. Orthologous to human PKIA (cAMP-dependent protein kinase inhibitor alpha). [provided by Alliance of Genome Resources, Apr 2022]