A structurally-diverse family of intracellular-signaling adaptor proteins that selectively tether specific protein kinase A subtypes to distinct subcellular sites. They play a role in focusing the PROTEIN KINASE A activity toward relevant substrates. Over fifty members of this family exist, most of which bind specifically to regulatory subunits of cyclic amp-dependent protein kinase type ii such as CAMP PROTEIN KINASE RIIALPHA or CAMP PROTEIN KINASE RIIBETA.