AKAP7_RIRII_bdg is the C-terminal domain of the cyclic AMP-dependent protein kinase A, PKA, anchor protein AKAP7. This protein anchors PKA, for its role in regulating PKA-mediated gene transcription in both somatic cells and oocytes, by binding to its regulatory subunits, RI and RII, hence being known as a dual-specific AKAP [1]. The 25 crucial amino acids of RII-binding domains in general form structurally conserved amphipathic helices with unrelated sequences; hydrophobic amino acid residues form the backbone of the interaction and hydrogen bond- and salt-bridge-forming amino acid residues increase the affinity of the interaction [2]. The N-terminus, of family AKAP7_NLS, carries the nuclear localisation signal.

1: AKAP7gamma is a nuclear RI-binding AKAP. Brown RL, August SL, Williams CJ, Moss SB; Biochem Biophys Res Commun. 2003;306:394-401. PMID:12804576

2: High-affinity AKAP7delta-protein kinase A interaction yields novel protein kinase A-anchoring disruptor peptides. Hundsrucker C, Krause G, Beyermann M, Prinz A, Zimmermann B, Diekmann O, Lorenz D, Stefan E, Nedvetsky P, Dathe M, Christian F, McSorley T, Krause E, McConnachie G, Herberg FW, Scott JD, Rosenthal W, Klussmann E; Biochem J. 2006;396:297-306. PMID:16483255