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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 Nat+Struct+Mol+Biol
2014 ; 21
(12
): 1082-90
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Caspase-activated phosphoinositide binding by CNT-1 promotes apoptosis by
inhibiting the AKT pathway
#MMPMID25383666
Nakagawa A
; Sullivan KD
; Xue D
Nat Struct Mol Biol
2014[Dec]; 21
(12
): 1082-90
PMID25383666
show ga
Inactivation of cell-survival factors is a crucial step in apoptosis. The
phosphoinositide 3-kinase (PI3K)-AKT signaling pathway promotes cell growth,
proliferation and survival, and its deregulation causes cancer. How this pathway
is suppressed to promote apoptosis is poorly understood. Here we report the
identification of a CED-3 caspase substrate in Caenorhabditis elegans, CNT-1,
that is cleaved during apoptosis to generate an N-terminal
phosphoinositide-binding fragment (tCNT-1). tCNT-1 translocates from the
cytoplasm to the plasma membrane and blocks AKT binding to phosphatidylinositol
(3,4,5)-trisphosphate, thereby disabling AKT activation and its prosurvival
activity. Our findings reveal a new mechanism that negatively regulates AKT cell
signaling to promote apoptosis and that may restrict cell growth and
proliferation in normal cells.