Enables cAMP-dependent protein kinase inhibitor activity. Acts upstream of or within negative regulation of protein import into nucleus; negative regulation of protein kinase activity; and negative regulation of transcription by RNA polymerase II. Predicted to be active in cytoplasm and nucleus. Is expressed in several structures, including genitourinary system; tongue; and vertebral axis musculature. Orthologous to human PKIG (cAMP-dependent protein kinase inhibitor gamma). [provided by Alliance of Genome Resources, Apr 2022]