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Direct, activating interaction between glycogen synthase kinase-3β and p53 after DNA damage
Piyajit Watcharasit*,
Gautam N. Bijur*,
Jaroslaw W. Zmijewski*,
Ling Song*,
Anna Zmijewska*,
Xinbin Chen,
Gail V. W. Johnson*,, and
Richard S. Jope*,,
Departments of *Psychiatry and Behavioral Neurobiology and Cell Biology, University of Alabama, Birmingham, AL 35294-0017
Received for publication February 2, 2002.
Abstract:
Glycogen synthase kinase-3β (GSK3β) is a central figurein Wnt signaling, in which its activity is controlled by regulatorybinding proteins. Here we show that binding proteins outsidethe Wnt pathway also control the activity of GSK3β. DNAdamage induced by camptothecin, which activates the tumor suppressorp53, was found to activate GSK3β. This activation occurredby a phosphorylation-independent mechanism involving directbinding of GSK3β to p53, which was confined to the nucleuswhere p53 is localized, and mutated p53 (R175H) bound but didnot activate GSK3β. Activation of GSK3 promoted responsesto p53 including increases in p21 levels and caspase-3 activity.Thus, after DNA damage there is a direct interaction betweenp53 and GSK3β, and these proteins act in concert to regulatecellular responses to DNA damage.
To whom reprint requests should be addressed at: Departmentof Psychiatry, Sparks Center 1057, University of Alabama, Birmingham,AL 35294-0017. E-mail: jope{at}uab.edu.
Edited by Joseph A. Beavo, University of Washington School ofMedicine, Seattle, WA, and approved April 19, 2002
This paper was submitted directly (Track II) to the PNAS office.
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