Journal
CELLULAR SIGNALLING
Volume 16, Issue 12, Pages 1345-1354Publisher
ELSEVIER SCIENCE INC
DOI: 10.1016/j.cellsig.2004.05.004
Keywords
extracellular signal regulated protein kinases; activation loop sequences; MAPK cascades; upstream activators; substrate phosphorylation; subcellular localisation
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Signal transduction pathways in eukaryotic cells integrate diverse extracellular signals, and regulate complex biological responses such as growth, differentiation and death. One group of proline-directed Ser/Thr protein kinases, the mitogen-activated protein kinases (MAPKs), plays a central role in these signalling pathways. Much attention has focused in recent years on three subfamilies of MAPKs, the extracellular signal regulated kinases (ERKs), c-Jun N-terminal kinases (JNKs) and the p38 MAPKs. However, the ERK family is broader than the ERK I and ERK2 proteins that have been the subject of most studies in this area. Here we overview the work on ERKs 3 to 8, emphasising where possible their biological activities as well as distinctive biochemical properties. It is clear from these studies that these additional ERKs show similarities to ERK1 and ERK2, but with some interesting differences that challenge the paradigm of the archetypical ERK1/2 MAPK pathway. (C) 2004 Elsevier Inc. All rights reserved.
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