The Ste5 scaffold directs mating signaling by catalytically unlocking the Fus3 MAP kinase for activation.
Good, M., Tang, G., Singleton, J., Remenyi, A., Lim, W.A.(2009) Cell 136: 1085-1097
- PubMed: 19303851 
- DOI: 10.1016/j.cell.2009.01.049
- Primary Citation of Related Structures:  
3FZE - PubMed Abstract: 
The scaffold protein Ste5 is required to properly direct signaling through the yeast mating pathway to the mitogen-activated protein kinase (MAPK), Fus3. Scaffolds are thought to function by tethering kinase and substrate in proximity. We find, however, that the previously identified Fus3-binding site on Ste5 is not required for signaling, suggesting an alternative mechanism controls Fus3's activation by the MAPKK Ste7 ...