Anchoring protein that binds preferentially to the type I regulatory subunit of c-AMP-dependent protein kinase (PKA type I) and targets it to distinct subcellular compartments. May act as a converging factor linking cAMP and sphingosine signaling pathways. Plays a regulatory role in the modulation of SPHK1 (By similarity). Interacts (via the PKA-RII subunit binding domain) with the RI subunit of PKA. Interacts with SPHK1; the interaction greatly reduces SPHK1 activity (By similarity). Colocalizes with SPHK1 in the cytoplasm. RII-binding site, predicted to form an amphipathic helix, could participate in protein-protein interactions with a complementary surface on the R-subunit dimer. Belongs to the AKAP110 family.