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.jpg): Failed to open stream: No such file or directory in C:\Inetpub\vhosts\kidney.de\httpdocs\pget.php on line 117 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.