Abstract:
:Glycogen synthase kinase 3 (GSK-3) is implicated in multiple biological processes including metabolism, gene expression, cell fate determination, proliferation, and survival. GSK-3 activity is inhibited through phosphorylation of serine 21 in GSK-3 alpha and serine 9 in GSK-3 beta. These serine residues of GSK-3 have been previously identified as targets of protein kinase B (PKB/Akt), a serine/threonine kinase located downstream of phosphatidylinositol 3-kinase. Here, we show that serine 21 in GSK-3 alpha and serine 9 in GSK-3 beta are also physiological substrates of cAMP-dependent protein kinase A. Protein kinase A physically associates with, phosphorylates, and inactivates both isoforms of GSK-3. The results indicate that depending on the stimulatory context, the activity of GSK-3 can be modulated either by growth factors that work through the phosphatidylinositol 3-kinase-protein kinase B cascade or by hormonal stimulation of G protein-coupled receptors that link to changes in intracellular cAMP levels.
journal_name
Proc Natl Acad Sci U S Aauthors
Fang X,Yu SX,Lu Y,Bast RC Jr,Woodgett JR,Mills GBdoi
10.1073/pnas.220413597keywords:
subject
Has Abstractpub_date
2000-10-24 00:00:00pages
11960-5issue
22eissn
0027-8424issn
1091-6490pii
220413597journal_volume
97pub_type
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