Binds to type I regulatory subunits of protein kinase A (PKA-RI) and may anchor/target them to the plasma membrane. Interacts with PRKAR1A and PRKAR1B. The GFP-tagged protein has been detected at the plasma membrane, enriched in filopodia and cell-cell junctions. Expressed in heart (at protein level). May be palmitoylated at Cys-3. Belongs to the small membrane AKAP family.