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• W1986202831 endingPage "e33662" @default.
• W1986202831 startingPage "e33662" @default.
• W1986202831 abstract "Background Cortactin is a classical Src kinase substrate that participates in actin cytoskeletal dynamics by activating the Arp2/3 complex and interacting with other regulatory proteins, including FAK. Cortactin has various domains that may contribute to the assembly of different protein platforms to achieve process specificity. Though the protein is known to be regulated by post-translational modifications such as phosphorylation and acetylation, how tyrosine phosphorylation regulates cortactin activity is poorly understood. Since the basal level of tyrosine phosphorylation is low, this question must be studied using stimulated cell cultures, which are physiologically relevant but unreliable and difficult to work with. In fact, their unreliability may be the cause of some contradictory findings about the dynamics of tyrosine phosphorylation of cortactin in different processes. Methodology/Principal Findings In the present study, we try to overcome these problems by using a Functional Interaction Trap (FIT) system, which involves cotransfecting cells with a kinase (Src) and a target protein (cortactin), both of which are fused to complementary leucine-zipper domains. The FIT system allowed us to control precisely the tyrosine phosphorylation of cortactin and explore its relationship with cortactin acetylation. Conclusions/Significance Using this system, we provide definitive evidence that a competition exists between acetylation and tyrosine phosphorylation of cortactin and that phosphorylation inhibits cell spreading. We confirmed the results from the FIT system by examining endogenous cortactin in different cell types. Furthermore, we demonstrate that cell spreading promotes the association of cortactin and FAK and that tyrosine phosphorylation of cortactin disrupts this interaction, which may explain how it inhibits cell spreading." @default.
• W1986202831 created "2016-06-24" @default.
• W1986202831 creator A5009580871 @default.
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• W1986202831 date "2012-03-30" @default.
• W1986202831 modified "2023-10-03" @default.
• W1986202831 title "Cortactin Tyrosine Phosphorylation Promotes Its Deacetylation and Inhibits Cell Spreading" @default.
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• W1986202831 doi "https://doi.org/10.1371/journal.pone.0033662" @default.
• W1986202831 hasPubMedCentralId "https://www.ncbi.nlm.nih.gov/pmc/articles/3316595" @default.
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• W1986202831 hasPublicationYear "2012" @default.
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