![]() Thus, more realistic models are needed to understand the role of scaffolds in mammalian signal transduction, which opens a big opportunity for systems biology. For example, these models predicted narrow optimal scaffold concentrations, but when revisiting these models by assuming typical concentrations, rather a range of scaffold levels optimally supports signaling. For scaffolds in mammalian signaling, however, models have been rather generic and sketchy. For the yeast scaffold Ste5, detailed mechanistic models have been valuable for the understanding of its function. Here we review experimental and theoretical approaches that address the function of two MAPK scaffolds, Ste5, a scaffold of the yeast mating pathway and KSR1/2, a scaffold of the classical mammalian MAPK signaling pathway. Above their basic function to bring several components of a signaling pathway together, recent experimental research has found that scaffolds influence signaling in a much more complex way: scaffolds can exert some catalytic function, influence signaling by allosteric mechanisms, are feedback-regulated, localize signaling activity to distinct regions of the cell or increase pathway fidelity. Scaffolding proteins add a new layer of complexity to the dynamics of cell signaling. ![]() 3Manchester Institute of Biotechnology, University of Manchester, Manchester, UK.2Institute for Theoretical Biology, Humboldt University Berlin, Berlin, Germany.1Institute of Pathology, Charité–Universitätsmedizin Berlin, Berlin, Germany.Franziska Witzel 1,2† Louise Maddison 3† Nils Blüthgen 1,2* ![]()
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