Dynamin is required for the activation of mitogen-activated protein (MAP) kinase by MAP kinase kinase - PubMed (original) (raw)
. 1999 Dec 10;274(50):35301-4.
doi: 10.1074/jbc.274.50.35301.
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- PMID: 10585393
- DOI: 10.1074/jbc.274.50.35301
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Dynamin is required for the activation of mitogen-activated protein (MAP) kinase by MAP kinase kinase
O Kranenburg et al. J Biol Chem. 1999.
Free article
Abstract
Internalization of activated receptors from the plasma membrane has been implicated in the activation of mitogen-activated protein (MAP) kinase. However, the mechanism whereby membrane trafficking may regulate mitogenic signaling remains unclear. Here we report that dominant-negative dynamin (K44A), an inhibitor of endocytic vesicle formation, abrogates MAP kinase activation in response to epidermal growth factor, lysophosphatidic acid, and protein kinase C-activating phorbol ester. In contrast, dynamin-K44A does not affect the activation of Ras, Raf, and MAP kinase kinase (MEK) by either agonist. Through immunofluorescence and subcellular fractionation studies, we find that activated MEK is present both at the plasma membrane and in intracellular vesicles but not in the cytosol. Our findings suggest that dynamin-regulated endocytosis of activated MEK, rather than activated receptors, is a critical event in the MAP kinase activation cascade.
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