Abstract
An understanding of how an extracellular stimulus causes changes in cell growth is emerging from the study of four signal transduction pathways in Saccharomyces cerevisiae: the pheromone-response, pseudohyphal differentiation, osmolarity-response, and protein kinase C activated pathways. Each of these pathways contains at its core a distinct mitogen-activated protein kinase cascade. Biochemical and molecular studies have determined the functional order of the kinases in the pheromone-response pathway and have suggested that they are organized into a complex by a protein scaffold. The cell surface sensor system for the osmolarity-response pathway has been identified. It shows striking similarity to bacterial two-component sensor-responder systems. Finally, components that integrate information from these pathways and communicate it to cell growth regulators have been revealed.
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