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Hoffmann, R. A wiki for the life sciences where authorship matters. Nature Genetics (2008)

Intracellular interaction of myosin light chain kinase with macrophage migration inhibition factor ( MIF) in endothelium.

The endothelial cell Ca2+/calmodulin (CaM)-dependent myosin light chain kinase isoform (EC MLCK) is a multifunctional contractile effector involved in vascular barrier regulation, leukocyte diapedesis, apoptosis, and angiogenesis. The EC MLCK isoform and its splice variants contain a unique N-terminal sequence not present in the smooth muscle MLCK isoform (SM MLCK), which allows novel upregulation of MLCK activation by signaling cascades including p60src. The yeast two-hybrid assay system using the entire EC MLCK1 N-terminus (922 aa) as bait, identified additional stable MLCK binding partners including the 12 KDa macrophage migration inhibitory factor ( MIF). This finding was confirmed by cross immunoprecipitation assays under non-denaturing conditions and by GST pull down experiments using GST-N-terminal MLCK (#1-923) and MLCK N-terminal deletion mutants in TNFalpha- and thrombin-stimulated endothelium. This EC MLCK- MIF interaction was shown biochemically and by immunofluorescent microscopy to be enhanced in TNFalpha- and thrombin-stimulated endothelium, both of which induce increased MLCK activity. Thrombin induced the colocalization of an epitope-tagged, full-length MIF fusion protein with phosphorylated MLC along peripheral actin stress fibers. Together these studies suggest that the novel interaction between MIF and MLCK may have important implications for the regulation of both non-muscle cytoskeletal dynamics as well as pathobiologic vascular events that involve MLCK.[1]


  1. Intracellular interaction of myosin light chain kinase with macrophage migration inhibition factor (MIF) in endothelium. Wadgaonkar, R., Dudek, S.M., Zaiman, A.L., Linz-McGillem, L., Verin, A.D., Nurmukhambetova, S., Romer, L.H., Garcia, J.G. J. Cell. Biochem. (2005) [Pubmed]
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