Saccharomyces_A

A cells secrete a pheromone and cells secrete

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Unformatted text preview: become a/ cells. During mating a and cells communicate with one another through pheromones: hormones that play a role in eliciting sexual behavior. a cells secrete a pheromone and cells secrete pheromone. Each haploid cell type carries receptors for the pheromone of the opposite cell type; a cells carry receptors for pheromone, and cells carry receptors for a pheromone (Fig. A.13). When bound to pheromone, the receptors activate a signal transduction system whose cascade of protein interactions ultimately promotes transcription of a specific set of genes. The yeast pheromones provide an example of how small molecules produced in one cell type and secreted into the extracellular environment can influence the behavior of a neighboring cell. Through the isolation of mutants, it has been possible to dissect genetically the processes by which cells produce and respond to pheromones. Researchers discovered many of the genes responsible for the pheromone response system by the isolation of sterile mutants. Some mutants are sterile because the...
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