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Annu Rev Cell Dev Biol. 2003;19:91-118.

Regulation of MAP kinase signaling modules by scaffold proteins in mammals.

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1
Regulation of Cell Growth Laboratory, NCI-Frederick, P.O. Box B, Frederick, Maryland 21702, USA. dmorrison@ncifcrf.gov

Abstract

The mitogen-activated protein kinase (MAPK) group of serine/threonine protein kinases mediates the response of cells to many extracellular stimuli such as cytokines and growth factors. These protein kinases include the extracellular signal-regulated protein kinases (ERK) and two stress-activated protein kinases (SAPK), the c-Jun N-terminal kinases (JNK), and the p38 MAPK. The enzymes are evolutionarily conserved and are activated by a common mechanism that involves a protein kinase cascade. Scaffold proteins have been proposed to interact with MAPK pathway components to create a functional signaling module and to control the specificity of signal transduction. Here we critically evaluate the evidence that supports a physiologically relevant role of MAPK scaffold proteins in mammals.

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