Binds to type I and II regulatory subunits of protein kinase A and anchors them to the cytoplasmic face of the mitochondrial outer membrane (By similarity). Involved in mitochondrial-mediated antiviral innate immunity (By similarity). Promotes translocation of NDUFS1 into mitochondria to regulate mitochondrial membrane respiratory chain NADH dehydrogenase (Complex I) activity (By similarity). Interacts with SLC8A3. Interacts with CFAP91. Interacts with CLPB (By similarity). Interacts with NDUFS1 (By similarity). Testis specific. By thyroid stimulating hormone (TSH) and cAMP or cAMP-analog. RII-alpha binding site, predicted to form an amphipathic helix, could participate in protein-protein interactions with a complementary surface on the R-subunit dimer.