AIRE functions as an E3 ubiquitin ligase.

AIRE functions as an E3 ubiquitin ligase.
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DOI:
10.1084/jem.20031291
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发表时间:
2004-01-19
期刊:
The Journal of experimental medicine
影响因子:
--
通讯作者:
Matsumoto M
Matsumoto M
中科院分区:
其他
文献类型:
--
作者:
Uchida D;Hatakeyama S;Matsushima A;Han H;Ishido S;Hotta H;Kudoh J;Shimizu N;Doucas V;Nakayama KI;Kuroda N;Matsumoto M

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自身免疫调节因子(AIRE)基因突变是导致自身免疫性多内分泌病-念珠菌病外胚层营养不良(autoimmune-polyendocrinopathy-candidiasis ectodermal dystrophy)的重要原因。AIRE主要表达于胸腺的髓质上皮细胞,被认为在自身耐受的建立中起重要作用。AIRE含有两个植物同源域(PHD)结构域,PHD作为E3泛素(Ub)连接酶的新作用刚刚出现。在这里,我们表明,第一个PHD(PHD 1)的AIRE介导E3连接酶活性。这一发现的重要性被以下事实所强调:PHD 1中的致病错义突变(C311 Y和P326 Q)消除了其E3连接酶活性。这些结果为AIRE增加了一种新的酶功能,并表明Ub蛋白酶体途径在AIRE参与的自身耐受性的建立中起着不可或缺的作用。
Autoimmune regulator (AIRE) gene mutation is responsible for the development of autoimmune-polyendocrinopathy-candidiasis ectodermal dystrophy, an organ-specific autoimmune disease with monogenic autosomal recessive inheritance. AIRE is predominantly expressed in medullary epithelial cells of the thymus and is considered to play important roles in the establishment of self-tolerance. AIRE contains two plant homeodomain (PHD) domains, and the novel role of PHD as an E3 ubiquitin (Ub) ligase has just emerged. Here we show that the first PHD (PHD1) of AIRE mediates E3 ligase activity. The significance of this finding was underscored by the fact that disease-causing missense mutations in the PHD1 (C311Y and P326Q) abolished its E3 ligase activity. These results add a novel enzymatic function for AIRE and suggest an indispensable role of the Ub proteasome pathway in the establishment of self-tolerance, in which AIRE is involved.
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