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Ca2+/calmodulin and apo-calmodulin both bind to and enhance the tyrosine kinase activity of c-Src

AutorStateva, Silvia R.; Salas, Valentina; Anguita, Estefanía; Benaim, Gustavo; Villalobo, Antonio
Fecha de publicación2015
EditorPublic Library of Science
CitaciónPLoS ONE 10(6): e0128783 (2015)
ResumenSrc family non-receptor tyrosine kinases play a prominent role in multiple cellular processes, including: cell proliferation, differentiation, cell survival, stress response, and cell adhesion and migration, among others. And when deregulated by mutations, overexpression, and/or the arrival of faulty incoming signals, its hyperactivity contributes to the development of hematological and solid tumors. c-Src is a prototypical member of this family of kinases, which is highly regulated by a set of phosphorylation events. Other factor contributing to the regulation of Src activity appears to be mediated by the Ca2+ signal generated in cells by different effectors, where the Ca2+-receptor protein calmodulin (CaM) plays a key role. In this report we demonstrate that CaM directly interacts with Src in both Ca2+-dependent and Ca2 +-independent manners in vitro and in living cells, and that the CaM antagonist N-(6-aminohexyl)-5-chloro-1-naphthalenesulfonamide (W-7) inhibits the activation of this kinase induced by the upstream activation of the epidermal growth factor receptor (EGFR), in human carcinoma epidermoide A431 cells, and by hydrogen peroxide-induced oxidative stress, in both A431 cells and human breast adenocarcinoma SK-BR-3 cells. Furthermore, we show that the Ca2+/CaM complex strongly activates the auto-phosphorylation and tyrosine kinase activity of c-Src toward exogenous substrates, but most relevantly and for the first time, we demonstrate that Ca2+-free CaM (apo-CaM) exerts a far higher activatory action on Src auto-phosphorylation and kinase activity toward exogenous substrates than the one exerted by the Ca2+/CaM complex. This suggests that a transient increase in the cytosolic concentration of free Ca2+ is not an absolute requirement for CaM-mediated activation of Src in living cells, and that a direct regulation of Src by apo-CaM could be inferred.
DescripciónThis is an open access article distributed under the terms of the Creative Commons Attribution License.
Versión del editorhttp://dx.doi.org/10.1371/journal.pone.0128783
URIhttp://hdl.handle.net/10261/124759
DOI10.1371/journal.pone.0128783
Identificadoresdoi: 10.1371/journal.pone.0128783
issn: 1932-6203
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