Phosphorylation of nicastrin by SGK1 leads to its degradation through lysosomal and proteasomal pathways.

Phosphorylation of nicastrin by SGK1 leads to its degradation through lysosomal and proteasomal pathways.
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DOI:
10.1371/journal.pone.0037111
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发表时间:
2012
期刊:
影响因子:
3.7
通讯作者:
Park HS
Park HS
中科院分区:
综合性期刊3区
文献类型:
--
作者:
Mo JS;Yoon JH;Hong JA;Kim MY;Ann EJ;Ahn JS;Kim SM;Baek HJ;Lang F;Choi EJ;Park HS

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γ-分泌酶复合物参与多种底物的膜内蛋白水解,包括淀粉样前体蛋白和Notch受体。Nicastrin(NCT)是γ-分泌酶复合物的重要组分,并作为γ-分泌酶底物的受体发挥作用。在这项研究中,我们确定血清和糖皮质激素诱导的蛋白激酶1(SGK 1)显着降低NCT的蛋白质稳定性。SGK 1激酶活性对NCT降解具有决定性作用,而内源性SGK 1抑制γ-分泌酶活性。SGK 1通过蛋白酶体和溶酶体途径下调NCT蛋白水平。此外,SGK 1直接结合并磷酸化Ser 437上的NCT,从而促进蛋白质降解。总的来说,我们的研究结果表明,SGK 1是一种γ-分泌酶调节剂,可能通过磷酸化和NCT降解有效。
The gamma-secretase complex is involved in the intramembranous proteolysis of a variety of substrates, including the amyloid precursor protein and the Notch receptor. Nicastrin (NCT) is an essential component of the gamma-secretase complex and functions as a receptor for gamma-secretase substrates. In this study, we determined that serum- and glucocorticoid-induced protein kinase 1 (SGK1) markedly reduced the protein stability of NCT. The SGK1 kinase activity was decisive for NCT degradation and endogenous SGK1 inhibited gamma-secretase activity. SGK1 downregulates NCT protein levels via proteasomal and lysosomal pathways. Furthermore, SGK1 directly bound to and phosphorylated NCT on Ser437, thereby promoting protein degradation. Collectively, our findings indicate that SGK1 is a gamma-secretase regulator presumably effective through phosphorylation and degradation of NCT.
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