2EZW

Solution structure of the docking and dimerization domain of the type I alpha regulatory subunit of protein kinase A (RIalpha D/D)

Summary for 2EZW

• Entry DOI: 10.2210/pdb2ezw/pdb
• Related: 1R2A
• Descriptor: cAMP-dependent protein kinase type I-alpha regulatory subunit (1 entity in total)
• Functional Keywords: regulatory subunit, anchoring, four-helix bundle, transferase
• Biological source: Bos taurus (cattle)
• Cellular location: Cell membrane : P00514
• Total number of polymer chains: 2
• Total formula weight: 12011.96

Authors

Banky, P. (deposition date: 2005-11-10, release date: 2006-02-14, Last modification date: 2024-11-13)

Primary citation

Banky, P.,Roy, M.,Newlon, M.G.,Morikis, D.,Haste, N.M.,Taylor, S.S.,Jennings, P.A.
Related Protein-Protein Interaction Modules Present Drastically Different Surface Topographies Despite A Conserved Helical Platform
J.Mol.Biol., 330:1117-1129, 2003

PubMed Abstract: The subcellular localization of cAMP-dependent protein kinase (PKA) occurs through interaction with A-Kinase Anchoring Proteins (AKAPs). AKAPs bind to the PKA regulatory subunit dimer of both type Ialpha and type IIalpha (RIalpha and RIIalpha). RIalpha and RIIalpha display characteristic localization within different cell types, which is maintained by interaction of AKAPs with the N-terminal dimerization and docking domain (D/D) of the respective regulatory subunit. Previously, we reported the solution structure of RIIa D/D module, both free and bound to AKAPs. We have now solved the solution structure of the dimerization and docking domain of the type Ialpha regulatory dimer subunit (RIalpha D/D). RIalpha D/D is a compact docking module, with unusual interchain disulfide bonds that help maintain the AKAP interaction surface. In contrast to the shallow hydrophobic groove for AKAP binding across the surface of the RIIalpha D/D dimeric interface, the RIalpha D/D module presents a deep cleft for proposed AKAP binding. RIalpha and RIIalpha D/D interaction modules present drastically differing dimeric topographies, despite a conserved X-type four-helix bundle structure.

PubMed: 12860132
DOI: 10.1016/S0022-2836(03)00552-7

Experimental method

SOLUTION NMR