Download MendeleyMolecular Basis of Akap Specificity for Pka Regululatory Subunits
Gold, M.G., Lygren, B., Dokurno, P., Hoshi, N., Mcconnachie, G., Tasken, K., Carlson, C.R., Scott, J.D., Barford, D.(2006) Mol Cell 24: 383
- PubMed: 17081989
- DOI: https://doi.org/10.1016/j.molcel.2006.09.006
- Primary Citation of Related Structures:
2IZX, 2IZY - PubMed Abstract:
Localization of cyclic AMP (cAMP)-dependent protein kinase (PKA) by A kinase-anchoring proteins (AKAPs) restricts the action of this broad specificity kinase. The high-resolution crystal structures of the docking and dimerization (D/D) domain of the RIIalpha regulatory subunit of PKA both in the apo state and in complex with the high-affinity anchoring peptide AKAP-IS explain the molecular basis for AKAP-regulatory subunit recognition. AKAP-IS folds into an amphipathic alpha helix that engages an essentially preformed shallow groove on the surface of the RII dimer D/D domains. Conserved AKAP aliphatic residues dominate interactions to RII at the predominantly hydrophobic interface, whereas polar residues are important in conferring R subunit isoform specificity. Using a peptide screening approach, we have developed SuperAKAP-IS, a peptide that is 10,000-fold more selective for the RII isoform relative to RI and can be used to assess the impact of PKA isoform-selective anchoring on cAMP-responsive events inside cells.
Organizational Affiliation:
Section of Structural Biology, Institute of Cancer Research, Chester Beatty Laboratories, 237 Fulham Road, London SW3 6JB, United Kingdom.
