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Letter

Nature Cell Biology 9, 1319–1326 (1 November 2007) | doi:10.1038/ncb1652

Spatial regulation of Fus3 MAP kinase activity through a reaction-diffusion mechanism in yeast pheromone signalling

Celine I. Maeder , Mark A. Hink , Ali Kinkhabwala , Reinhard Mayr , Philippe I. H. Bastiaens & Michael Knop

Signal transduction through mitogen-activated protein kinase (MAPK) cascades is thought to occur through the assembly of macromolecular complexes. We quantified the abundance of complexes in the cytoplasm among the MAPKs Ste11, Ste7, Fus3 and the scaffold protein Ste5 in yeast pheromone signalling using fluorescence cross-correlation spectroscopy (FCCS).