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Molecular and Cellular Biology, February 2001, p. 893-901, Vol. 21, No. 3
Molecular Neurobiology Program, Skirball
Institute for Biomolecular Medicine, New York University School of
Medicine, New York, New York 10016,1 and
Department of Pharmacology, Columbia University, New York,
New York 100322
Received 28 July 2000/Returned for modification 20 September
2000/Accepted 7 November 2000
The Akt family of serine/threonine-directed kinases promotes
cellular survival in part by phosphorylating and inhibiting
death-inducing proteins. Here we describe a novel functional
interaction between Akt and apoptosis signal-regulating kinase 1 (ASK1), a mitogen-activated protein kinase kinase kinase. Akt decreased
ASK1 kinase activity stimulated by both oxidative stress and
overexpression in 293 cells by phosphorylating a consensus Akt site at
serine 83 of ASK1. Activation of the phosphoinositide 3-kinase
(PI3-K)/Akt pathway also inhibited the serum deprivation-induced
activity of endogenous ASK1 in L929 cells. An association between Akt
and ASK1 was detected in cells by coimmunoprecipitation.
Phosphorylation by Akt inhibited ASK1-mediated c-Jun N-terminal kinase
and activating transcription factor 2 activities in intact cells.
Finally, activation of the PI3-K/Akt pathway reduced apoptosis induced
by ASK1 in a manner dependent on phosphorylation of serine 83 of ASK1.
These results provide the first direct link between Akt and the family of stress-activated kinases.
0270-7306/01/$04.00+0 DOI: 10.1128/MCB.21.3.893-901.2001
Copyright © 2001, American Society for Microbiology. All rights reserved.
Akt Phosphorylates and Negatively Regulates
Apoptosis Signal-Regulating Kinase 1
*
Corresponding author. Mailing address: Skirball
Institute, NYU Medical Center, 540 First Ave., Rm. 5-15, New York, NY
10016. Phone: (212) 263-0721. Fax: (212) 263-0723. E-mail:
chao{at}saturn.med.nyu.edu.
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