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천재순,강상순,Taegun Kwon,이은정,Chang Hyun Kim,한연수,홍순광,Sounghee Hyun 한국분자세포생물학회 2004 Molecules and cells Vol.18 No.3
The microtubule-associated protein, tau, is involved in numerous neuronal processes such as vesicle transport, microtubule-plasma membrane interaction and the intracellular localization of proteins. Tau is known to be phosphorylated by several kinases such as mitogen activated protein kinase, microtubule affinity regulating kinase, and protein kinase A. We found a putative serum- and glucocorticoid- induced protein kinase 1 (SGK1) phosphorylation site within the 207GSRSRTPSLP216 tau amino acid sequence. We report here that SGK1 phosphorylates Ser214 of Tau. Using a pull-down assay, we found that 14-3-3θ interacts with SGK1 and tau to form a ternary protein complex that leads to phosphorylation of tau. 14-3-3 and phosphorylated tau were mainly co-localized in the nucleus of COS-1 cells. These results demonstrate that 14-3-3 scaffolds tau with SGK1 to facilitate the phosphorylation of tau at Ser214 and to regulate its subcellular localization.
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