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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 Biochem+J
2015 ; 471
(1
): 37-51
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gab.com Text
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English Wikipedia
Akt kinase C-terminal modifications control activation loop dephosphorylation and
enhance insulin response
#MMPMID26201515
Chan TO
; Zhang J
; Tiegs BC
; Blumhof B
; Yan L
; Keny N
; Penny M
; Li X
; Pascal JM
; Armen RS
; Rodeck U
; Penn RB
Biochem J
2015[Oct]; 471
(1
): 37-51
PMID26201515
show ga
The Akt protein kinase, also known as protein kinase B, plays key roles in
insulin receptor signalling and regulates cell growth, survival and metabolism.
Recently, we described a mechanism to enhance Akt phosphorylation that restricts
access of cellular phosphatases to the Akt activation loop (Thr(308) in Akt1 or
protein kinase B isoform alpha) in an ATP-dependent manner. In the present paper,
we describe a distinct mechanism to control Thr(308) dephosphorylation and thus
Akt deactivation that depends on intramolecular interactions of Akt C-terminal
sequences with its kinase domain. Modifications of amino acids surrounding the
Akt1 C-terminal mTORC2 (mammalian target of rapamycin complex 2) phosphorylation
site (Ser(473)) increased phosphatase resistance of the phosphorylated activation
loop (pThr(308)) and amplified Akt phosphorylation. Furthermore, the
phosphatase-resistant Akt was refractory to ceramide-dependent dephosphorylation
and amplified insulin-dependent Thr(308) phosphorylation in a regulated fashion.
Collectively, these results suggest that the Akt C-terminal hydrophobic groove is
a target for the development of agents that enhance Akt phosphorylation by
insulin.