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標題: Rad23蛋白類泛素區域磷酸化對其與26S proteasome之結合及紫外光逆境下之生存力具負調控之作用
Phosphorylation of S47 within UbL domain of Rad23 down-regulated association with 26S proteasome and survival rate with UV light stress.
作者: 李彥德
Li, Yen-Te
關鍵字: Rad23 phosphorylation;磷酸化
出版社: 生命科學系所
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Rad23為在物種間具有高度保留之蛋白,其具有多種功能,主要參與在核酸修補機制及蛋白質降解過程中。然而Rad23訊息傳導所調控之功能仍未清楚。在我們實驗室之前已知Rad23能在活體內被磷酸化。為了研究Rad23磷酸化所調控為何,我們利用了活體外激酶分析及免疫沈澱法證明了Rad23上多個位置能被Kin28及Rad53磷酸化。我們所突變之Rad23蛋白並不影響Rad23的雙體結合,然而我們發現當Rad23之Serine47位置模擬磷酸化 (S47E) 時,此時Rad23與26S proteasome之結合及泛素鍵 (ubiquitin chain) 結合能力均有下降之情形。此外,S47E及S94A的突變也會減低Rad23與Rad4之結合性。我們也發現S47E會降低Rad23對26S proteasome活性之貢獻。而在生理功能上,S47E增加了酵母菌對紫外光及化學物質之感受性。由結果我們推測,Rad23之Serine 47位置磷酸化時,可能對Rad23與26S proteasome之結合及紫外光逆境生存力進行負調控。然而,S47磷酸化之機制能需進一步研究。

Rad23 was involved in multiple functions, such as DNA repair system and ubiquitin-proteasome system. Although Rad23 was highly conserved in various species, the function regulated by signaling of Rad23 was unclear. In our lab previous data, we determined Rad23 was phosphorylated in vivo. To investigate the regulation was controlled with phosphorylated Rad23, in vitro kinase assay and immunoprepicitations were used to examine multiple positions of Rad23 were phosphrylated by Rad53 or Kin28. Rad23 mutants did not affect homo-dimerization of Rad23 itself. However, S47E mutant significantly reduced interaction with 26S subunits and multi-ubiquitin chain binding ability. In addition, S94A decreased association with Rad4 slightly. S47E also reduced contribution of Rad23 on 26S proteasome activity. In bio-function analysis, S47E increased UV light sensitivity. Based on results showed, we suggested phosphorylation of S47 within UbL domain of Rad23 might down-regulate association with 26S proteasome and survival rate with UV light stress. However, the mechanism of phosphorylated S47 would still be investigated.
其他識別: U0005-1701200904291600
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