title: Allostery and binding cooperativity of the catalytic subunit of protein kinase A by NMR spectroscopy and molecular dynamics simulations.
abstract: The catalytic subunit of cAMP-dependent protein kinase A (PKA-C) is an exquisite example of a single molecule allosteric enzyme, where classical and modern views of allosteric signaling merge. In this chapter, we describe the mapping of PKA-C conformational dynamics and allosteric signaling in the free and bound states using a combination of NMR spectroscopy and molecular dynamics simulations. We show that ligand binding affects the enzyme's conformational dynamics, shaping the free-energy landscape toward the next stage of the catalytic cycle. While nucleotide and substrate binding enhance the enzyme's conformational entropy and define dynamically committed states, inhibitor binding attenuates the internal dynamics in favor of enthalpic interactions and delineates dynamically quenched states. These studies support a central role of conformational dynamics in many aspects of enzymatic turnover and suggest future avenues for controlling enzymatic function.
authors.affiliation: Department of Biochemistry, Molecular Biology, and Biophysics, University of Minnesota, Minneapolis, Minnesota, USA.
authors.forename: Larry R
authors.initials: LR
authors.lastname: Masterson
authors.forename: Alessandro
authors.initials: A
authors.lastname: Cembran
authors.forename: Lei
authors.initials: L
authors.lastname: Shi
authors.forename: Gianluigi
authors.initials: G
authors.lastname: Veglia
mesh_terms: D000494:Allosteric Regulation; D000495:Allosteric Site; D054751:Cyclic AMP-Dependent Protein Kinase Catalytic Subunits / Q000737:chemistry* / Q000378:metabolism*; D008024:Ligands; D056004:Molecular Dynamics Simulation; D019906:Nuclear Magnetic Resonance, Biomolecular
chemical_list: D008024:Ligands; D054751:Cyclic AMP-Dependent Protein Kinase Catalytic Subunits