Regulation of lymphoid tyrosine phosphatase activity: inhibition of the catalytic domain by the proximal interdomain.

Regulation of lymphoid tyrosine phosphatase activity: inhibition of the catalytic domain by the proximal interdomain.
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DOI:
10.1021/bi900332f
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发表时间:
2009-08-11
期刊:
影响因子:
2.9
通讯作者:
Bottini, Nunzio
Bottini, Nunzio
中科院分区:
生物学3区
文献类型:
--
作者:
Liu, Yingge;Stanford, Stephanie M.;Jog, Sonali P.;Fiorillo, Edoardo;Orru, Valeria;Comai, Lucio;Bottini, Nunzio

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由PTPN 22基因编码的淋巴酪氨酸磷酸酶LYP最近成为人类自身免疫的主要参与者和候选药物靶标。该酶包括一个经典的N-末端蛋白酪氨酸磷酸酶催化结构域和一个C-末端PEST富集结构域,由一个约300个氨基酸的结构域间隔开。对LYP的调控知之甚少。在这里,通过分析系列截断突变体的LYP,我们表明,磷酸酶活性强烈抑制蛋白质区域的C-末端的催化结构域。我们将最小抑制区域映射到域间的近端部分。我们发现,LYP的活性被抑制的分子内机制,其中近端部分的interdomain直接与催化结构域相互作用,并降低其活性。
The lymphoid tyrosine phosphatase LYP, encoded by the PTPN22 gene, recently emerged as a major player and candidate drug target for human autoimmunity. The enzyme includes a classical N-terminal protein tyrosine phosphatase catalytic domain and a C-terminal PEST-enriched domain, separated by an ∼300-amino acid interdomain. Little is known about the regulation of LYP. Herein, by analysis of serial truncation mutants of LYP, we show that the phosphatase activity is strongly inhibited by protein regions C-terminal to the catalytic domain. We mapped the minimal inhibitory region to the proximal portion of the interdomain. We show that the activity of LYP is inhibited by an intramolecular mechanism, whereby the proximal portion of the interdomain directly interacts with the catalytic domain and reduces its activity.
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