Research ArticleCOMPUTATIONAL BIOLOGY

Dynamic Signaling in the Hog1 MAPK Pathway Relies on High Basal Signal Transduction

Science Signaling  24 Mar 2009:
Vol. 2, Issue 63, pp. ra13
DOI: 10.1126/scisignal.2000056

You are currently viewing the abstract.

View Full Text

Log in


Abstract

Appropriate regulation of the Hog1 mitogen-activated protein kinase (MAPK) pathway is essential for cells to survive osmotic stress. Here, we show that the two sensing mechanisms upstream of Hog1 display different signaling properties. The Sho1 branch is an inducible nonbasal system, whereas the Sln1 branch shows high basal signaling that is restricted by a MAPK-mediated feedback mechanism. A two-dimensional mathematical model of the Snl1 branch, including high basal signaling and a Hog1-regulated negative feedback, shows that a system with basal signaling exhibits higher efficiency, with faster response times and higher sensitivity to variations in external signals, than would systems without basal signaling. Analysis of two other yeast MAPK pathways, the Fus3 and Kss1 signaling pathways, indicates that high intrinsic basal signaling may be a general property of MAPK pathways allowing rapid and sensitive responses to environmental changes.

View Full Text