Fine regulation of Saccharomyces cerevisiae MAPK pathways by post-translational modifications.

Saccharomyces cerevisiae has been widely used as a model eukaryotic organism to elucidate the molecular mechanisms that operate upon activation of signalling pathways. For over two decades, many clues to the regulation of mitogen-activated protein kinase (MAPK) pathways have derived from basic research in yeast. Here we review aspects of MAPK pathway fine-tuning, such as the functional implication of feedback loops or regulatory inputs from other pathways, mediated by post-transcriptional modifications on their components. The impact of recent phosphoproteomic approaches in this particular field is also discussed.