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Human serum and glucocorticoid-inducible kinase-like kinase (SGKL) phosphorylates glycogen syntheses kinase 3 beta (GSK-3beta) at serine-9 through direct interaction.

Serum and glucocorticoid-inducible kinase-like kinase (SGKL) has been identified as a new integrator that decodes lipid signals produced by the activation of phosphoinositide 3-kinase (PI3K). SGKL is activated via its lipid-binding domain (phox homology domain) in response to PI3K signaling. However, downstream targets of SGKL as well as the role of SGKL as a mediator in PI3K signaling in human tissues remain to be established. In this study, we identified human glycogen synthase kinase 3 beta (GSK-3beta) as a specific interacting partner with SGKL in a yeast two-hybrid screening of human brain cDNA library. The association between these two proteins is confirmed independently in human embryonic kidney (HEK293) cells by co-immunoprecipitation. Furthermore, the kinase activity of wild-type SGKL was required for the in vitro phosphorylation of a GSK-3 crosstide fusion protein at serine-21/9 as demonstrated with a Phospho-GSK-3alpha/beta (Ser21/9) specific antibody. The present results provide strong evidences that SGKL could utilize GSK-3beta as a direct downstream target by phosphorylating GSK-3beta at serine-9.

Pubmed ID: 12054501 RIS Download

Mesh terms: Brain | Calcium-Calmodulin-Dependent Protein Kinases | DNA, Complementary | Gene Library | Glycogen Synthase Kinase 3 | Glycogen Synthase Kinases | Humans | Phosphatidylinositol 3-Kinases | Phosphorylation | Plasmids | Precipitin Tests | Protein Binding | Protein Structure, Tertiary | Protein-Serine-Threonine Kinases | Serine | Signal Transduction | Two-Hybrid System Techniques

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