Download MendeleyThe Ste5 scaffold allosterically modulates signaling output of the yeast mating pathway.
Bhattacharyya, R.P., Remenyi, A., Good, M.C., Bashor, C.J., Falick, A.M., Lim, W.A.(2006) Science 311: 822-826
- PubMed: 16424299
- DOI: https://doi.org/10.1126/science.1120941
- Primary Citation of Related Structures:
2F49, 2F9G, 2FA2 - PubMed Abstract:
Scaffold proteins organize signaling proteins into pathways and are often viewed as passive assembly platforms. We found that the Ste5 scaffold has a more active role in the yeast mating pathway: A fragment of Ste5 allosterically activated autophosphorylation of the mitogen-activated protein kinase Fus3. The resulting form of Fus3 is partially active-it is phosphorylated on only one of two key residues in the activation loop. Unexpectedly, at a systems level, autoactivated Fus3 appears to have a negative regulatory role, promoting Ste5 phosphorylation and a decrease in pathway transcriptional output. Thus, scaffolds not only direct basic pathway connectivity but can precisely tune quantitative pathway input-output properties.
Organizational Affiliation:
Department of Cellular and Molecular Pharmacology, University of California-San Francisco, 600 16th Street, San Francisco, CA 94143-2240, USA.
