Animal cells and systems

The Korean Society for Integrative Biology (한국통합생물학회)
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Phosphorylation of $Ser^{246}$ Residue in Integrin-linked Kinase 1 by Serum- and Glucocorticoid-induced Kinase 1 is Required to Form a Protein-protein Complex with 14-3-3

  • Chun, Jae-Sun (Department of Biology Education, Korea National University of Education) ;
  • Kang, Sang-Sun (School of Science Education Chungbuk National University)
  • Published : 2005.09.01
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Abstract

Integrin-linked kinase 1 (ILK1) regulates several protein kinases, including PKB/Akt kinase and glycogen synthase kinase ${\beta}$. ILK1 is also involved distinctively in the cell morphological and structural functions by interacting with the components of the extracellular matrix or integrin. According to the information of serum- and glucocorticoid-induced kinase 1 (SGK1) substrate specificity (R-X-R-X-X(S/T)-${\phi};{\phi}$ indicates a hydrophobic amino acid), two putative phosphorylation sites, $Thr^{181}\;and\;Ser^{246}$, were found in ILK1. We showed that ILK1 fusion protein and two fluorescein-labeled ILK1 peptides, $FITC-^{174}RTRPRNGTLN^{183}$ and $FITC-^{239}CPRLRIFSHP^{248}$, were phosphorylated by SGK1 in vitro. We also identified that 14-3-3 ${\theta}\;{\varepsilon}\;and\;{\xi}$, among several 143-3 isotypes $({\beta},\;{\gamma},\;{\varepsilon},\;{\eta},\;{\sigma},\;{\theta},\;{\tau}\;and\;{\xi})$ formed protein complex with ILK1 in COS-1 cells. Furthermore, the phosphorylation of $Ser^{246}$ by SGK1 induced the binding with 14-3-3. It was also demonstrated that 14-3-3-bound ILK1 has reduced kinase activity. Thus, these data suggest that SGK1 phosphorylates $Thr^{181}\;and\;Ser^{246}$ of ILK1 and the phosphorylation of its $Ser^{246}$ makes ILK1 bind to 14-3-3, resulting in the inhibition of ILK1 kinase activity.

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References

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