MAP kinase dynamics in response to pheromones in budding yeast - PubMed (original) (raw)
MAP kinase dynamics in response to pheromones in budding yeast
F van Drogen et al. Nat Cell Biol. 2001 Dec.
Abstract
Although scaffolding is a major regulator of mitogen-activated protein kinase (MAPK) pathways, scaffolding proteins are poorly understood. During yeast mating, MAPK Fus3p is phosphorylated by MAPKK Ste7p, which is activated by MAPKKK Ste11p. This MAPK module interacts with the scaffold molecule Ste5p. Here we show that Ste11p and Ste7p were predominantly cytoplasmic proteins, while Ste5p and Fus3p were found in the nucleus and the cytoplasm. Ste5p, Ste7p and Fus3p also localized to tips of mating projections in pheromone-treated cells. Using fluorescence recovery after photobleaching (FRAP), we demonstrate that Fus3p rapidly shuttles between the nucleus and the cytoplasm independently of pheromones, Fus3p phosphorylation and Ste5p. Membrane-bound Ste5p can specifically recruit Fus3p and Ste7p to the cell cortex. Ste5p remains stably bound at the plasma membrane, unlike activated Fus3p, which dissociates from Ste5p and translocates to the nucleus.
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