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PLoS One

Title:		Signal response sensitivity in the yeast mitogen-activated protein kinase cascade
Author(s):		Thalhauser CJ; Komarova NL;
Address:		"Department of Mathematics, University of California Irvine, Irvine, California, United States of America"
Journal Title:		PLoS One
Year:		2010
Volume:		20100723
Issue:		7
Page Number:		e11568 -
DOI:		10.1371/journal.pone.0011568
ISSN/ISBN:		1932-6203 (Electronic) 1932-6203 (Linking)
Abstract:		"The yeast pheromone response pathway is a canonical three-step mitogen activated protein kinase (MAPK) cascade which requires a scaffold protein for proper signal transduction. Recent experimental studies into the role the scaffold plays in modulating the character of the transduced signal, show that the presence of the scaffold increases the biphasic nature of the signal response. This runs contrary to prior theoretical investigations into how scaffolds function. We describe a mathematical model of the yeast MAPK cascade specifically designed to capture the experimental conditions and results of these empirical studies. We demonstrate how the system can exhibit either graded or ultrasensitive (biphasic) response dynamics based on the binding kinetics of enzymes to the scaffold. At the basis of our theory is an analytical result that weak interactions make the response biphasic while tight interactions lead to a graded response. We then show via an analysis of the kinetic binding rate constants how the results of experimental manipulations, modeled as changes to certain of these binding constants, lead to predictions of pathway output consistent with experimental observations. We demonstrate how the results of these experimental manipulations are consistent within the framework of our theoretical treatment of this scaffold-dependent MAPK cascades, and how future efforts in this style of systems biology can be used to interpret the results of other signal transduction observations"
Keywords:		"Mitogen-Activated Protein Kinases/*metabolism Models, Theoretical Yeasts/enzymology/*metabolism;"
Notes:		"MedlineThalhauser, Craig J Komarova, Natalia L eng P50 GM076516/GM/NIGMS NIH HHS/ R01 GM075309/GM/NIGMS NIH HHS/ GM75309/GM/NIGMS NIH HHS/ 1P50GM076516-01A1/GM/NIGMS NIH HHS/ Research Support, N.I.H., Extramural 2010/07/30 PLoS One. 2010 Jul 23; 5(7):e11568. doi: 10.1371/journal.pone.0011568"