14-3-3 Isotypes facilitate coupling of protein kinase C-ζ to Raf-1: negative regulation by 14-3-3 phosphorylation
نویسندگان
چکیده
منابع مشابه
14-3-3 isotypes facilitate coupling of protein kinase C-zeta to Raf-1: negative regulation by 14-3-3 phosphorylation.
14-3-3 Proteins may function as adapters or scaffold in signal-transduction pathways. We found previously that protein kinase C-zeta (PKC-zeta) can phosphorylate and activate Raf-1 in a signalling complex [van Dijk, Hilkmann and van Blitterswijk (1997) Biochem. J. 325, 303-307]. We report now that PKC-zeta-Raf-1 interaction is mediated by 14-3-3 proteins in vitro and in vivo. Co-immunoprecipita...
متن کاملRegulation of the Raf-1 kinase domain by phosphorylation and 14-3-3 association.
The Raf-1 kinase domain is kept in an inactive state by the N-terminal regulatory domain. Activation of the kinase domain occurs following release from the N-terminal repression and possible catalytic upregulation. To distinguish the regulatory mechanisms that directly influence the catalytic activity of the enzyme from those which act through the inhibitory domain, the catalytic domain of Raf-...
متن کامل14-3-3 proteins are required for maintenance of Raf-1 phosphorylation and kinase activity.
By binding to serine-phosphorylated proteins, 14-3-3 proteins function as effectors of serine phosphorylation. The exact mechanism of their action is, however, still largely unknown. Here we demonstrate a requirement for 14-3-3 for Raf-1 kinase activity and phosphorylation. Expression of dominant negative forms of 14-3-3 resulted in the loss of a critical Raf-1 phosphorylation, while overexpres...
متن کاملNegative regulation of Raf activity by binding of 14-3-3 to the amino terminus of Raf in vivo
In the developing eye of Drosophila the protein kinase D-Raf controls the specification of the R7 photoreceptor cells. We show that overexpression of wild-type D-Raf inhibits the formation of R7 cells in a dose-dependent manner. Conversely, overexpression of mutant D-Raf proteins in which the conserved S388 is replaced by A or by D promotes the formation of supernumerary R7 cells, indicating in...
متن کاملRegulation of RAF activity by 14-3-3 proteins: RAF kinases associate functionally with both homo- and heterodimeric forms of 14-3-3 proteins.
Mammalian 14-3-3 proteins play a crucial role in the activation process of RAF kinases. However, little is known about the selectivity of the mammalian 14-3-3 isoforms with respect to RAF association and activation. Using mass spectrometry, we analyzed the composition of the 14-3-3 isoforms attached to RAF kinases and found that B-RAF associates in vivo with 14-3-3 at much higher diversity than...
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ژورنال
عنوان ژورنال: Biochemical Journal
سال: 2000
ISSN: 0264-6021
DOI: 10.1042/0264-6021:3450297