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Front Biosci (Landmark Ed). 2016 Jan 1;21:374-84.

New insights into the activation, interaction partners and possible functions of MK5/PRAK.

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Department of Medical Biology, UiT-The Arctic University of Norway, N9037 Tromsoe, Norway.
Cancer Research UK Stress Response Laboratory, Medical Research Institute, Division of Cancer Research, Jacqui Wood Cancer Centre, James Arrot Drive, Ninewells Hospital and Medical School, Dundee DD1 9SY, United Kingdom.
Department of Pharmacy, UiT-The Arctic University of Norway, N9037 Tromsoe, Norway,


MAP kinase-activated protein kinase 5 (MK5) was first described as a downstream target of the p38 MAP kinase pathway leading to its alternative acronym of p38-regulated/activated protein kinase (PRAK). However, since the discovery that MK5 is a bona fide interaction partner of the atypical MAP kinases ERK3 and ERK4 and that this interaction leads to both the activation and subcellular relocalisation of MK5, there has been considerable debate as to the relative roles of these MAPK pathways in mediating the activation and biological functions of MK5. Here we discuss recent progress in defining novel upstream components of the ERK3/ERK4 signalling pathway, our increased understanding of the mechanism by which MK5 interacts with and is activated by ERK3 and ERK4, and the discovery of novel interaction partners for MK5. Finally, we review recent literature that suggests novel biological functions for MK5 in a range of physiological and pathophysiological conditions including neuronal function and cancer.

[Indexed for MEDLINE]

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