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10.1074/jbc.M114.575571

http://scihub22266oqcxt.onion/10.1074/jbc.M114.575571
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suck abstract from ncbi


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pmid25124033
      J+Biol+Chem 2014 ; 289 (40 ): 27400-9
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  • Degradation of Tiam1 by casein kinase 1 and the SCF?TrCP ubiquitin ligase controls the duration of mTOR-S6K signaling #MMPMID25124033
  • Magliozzi R ; Kim J ; Low TY ; Heck AJ ; Guardavaccaro D
  • J Biol Chem 2014[Oct]; 289 (40 ): 27400-9 PMID25124033 show ga
  • Tiam1 (T-cell lymphoma invasion and metastasis 1) is a guanine nucleotide exchange factor that specifically controls the activity of the small GTPase Rac, a key regulator of cell adhesion, proliferation, and survival. Here, we report that in response to mitogens, Tiam1 is degraded by the ubiquitin-proteasome system via the SCF(?TrCP) ubiquitin ligase. Mitogenic stimulation triggers the binding of Tiam1 to the F-box protein ?TrCP via its degron sequence and subsequent Tiam1 ubiquitylation and proteasomal degradation. The proteolysis of Tiam1 is prevented by ?TrCP silencing, inhibition of CK1 and MEK, or mutation of the Tiam1 degron site. Expression of a stable Tiam1 mutant that is unable to interact with ?TrCP results in sustained activation of the mTOR/S6K signaling and increased apoptotic cell death. We propose that the SCF(?TrCP)-mediated degradation of Tiam1 controls the duration of the mTOR-S6K signaling pathway in response to mitogenic stimuli.
  • |*Signal Transduction [MESH]
  • |Casein Kinase I/genetics/*metabolism [MESH]
  • |Guanine Nucleotide Exchange Factors/genetics/*metabolism [MESH]
  • |Humans [MESH]
  • |Phosphorylation [MESH]
  • |Protein Binding [MESH]
  • |Proteolysis [MESH]
  • |Ribosomal Protein S6 Kinases, 70-kDa/genetics/*metabolism [MESH]
  • |SKP Cullin F-Box Protein Ligases/genetics/*metabolism [MESH]
  • |T-Lymphoma Invasion and Metastasis-inducing Protein 1 [MESH]
  • |TOR Serine-Threonine Kinases/genetics/*metabolism [MESH]


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