title: Mutation of a kinase allosteric node uncouples dynamics linked to phosphotransfer.
abstract: The expertise of protein kinases lies in their dynamic structure, wherein they are able to modulate cellular signaling by their phosphotransferase activity. Only a few hundreds of protein kinases regulate key processes in human cells, and protein kinases play a pivotal role in health and disease. The present study dwells on understanding the working of the protein kinase-molecular switch as an allosteric network of "communities" composed of congruently dynamic residues that make up the protein kinase core. Girvan-Newman algorithm-based community maps of the kinase domain of cAMP-dependent protein kinase A allow for a molecular explanation for the role of protein conformational entropy in its catalytic cycle. The community map of a mutant, Y204A, is analyzed vis-à-vis the wild-type protein to study the perturbations in its dynamic profile such that it interferes with transfer of the γ-phosphate to a protein substrate. Conventional biochemical measurements are used to ascertain the effect of these dynamic perturbations on the kinetic profiles of both proteins. These studies pave the way for understanding how mutations far from the kinase active site can alter its dynamic properties and catalytic function even when major structural perturbations are not obvious from static crystal structures.
authors.affiliation: Department of Pharmacology, University of California, San Diego, La Jolla, CA 92093.
authors.forename: Lalima G
authors.initials: LG
authors.lastname: Ahuja
authors.affiliation: Department of Pharmacology, University of California, San Diego, La Jolla, CA 92093.
authors.forename: Alexandr P
authors.initials: AP
authors.lastname: Kornev
authors.affiliation: Cardiovascular and Metabolic Diseases, Medicinal Chemistry, Pfizer Biomedical Institute, Pfizer, Inc., Cambridge, MA 02139.
authors.forename: Christopher L
authors.initials: CL
authors.lastname: McClendon
authors.affiliation: Department of Chemistry, University of Minnesota, Minneapolis, MN 55455.|Department of Biochemistry, Molecular Biology, and Biophysics, University of Minnesota, Minneapolis, MN 55455.
authors.forename: Gianluigi
authors.initials: G
authors.lastname: Veglia
authors.affiliation: Department of Pharmacology, University of California, San Diego, La Jolla, CA 92093; staylor@ucsd.edu.|Department of Chemistry and Biochemistry, University of California, San Diego, La Jolla, CA 92093.
authors.forename: Susan S
authors.initials: SS
authors.lastname: Taylor
mesh_terms: D000465:Algorithms; D000494:Allosteric Regulation; D000495:Allosteric Site; D000818:Animals; D055162:Biocatalysis; D020134:Catalytic Domain; D018360:Crystallography, X-Ray; D017868:Cyclic AMP-Dependent Protein Kinases / Q000737:chemistry* / Q000235:genetics* / Q000378:metabolism; D019277:Entropy; D007700:Kinetics; D051379:Mice; D008958:Models, Molecular; D009154:Mutation; D010766:Phosphorylation; D011487:Protein Conformation
chemical_list: D017868:Cyclic AMP-Dependent Protein Kinases
keywords: allostery; catalytic cycle; community maps; protein dynamics; protein kinases