Structure of a protein phosphatase 2A holoenzyme: insights into B55-mediated Tau dephosphorylation.

Structure of a protein phosphatase 2A holoenzyme: insights into B55-mediated Tau dephosphorylation.
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DOI:
10.1016/j.molcel.2008.08.006
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发表时间:
2008-09-26
期刊:
影响因子:
16
通讯作者:
Shi, Yigong
Shi, Yigong
中科院分区:
生物学1区
文献类型:
--
作者:
Xu, Yanhui;Chen, Yu;Zhang, Ping;Jeffrey, Philip D.;Shi, Yigong

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蛋白磷酸酶2A(PP 2A)调节细胞生理学的许多重要方面。调节B/B55/PR 55家族的成员被认为在Tau的去磷酸化中起关键作用,Tau的过度磷酸化导致阿尔茨海默病。PP 2A-Tau连接的潜在机制在很大程度上仍然是谜。在这里,我们报告了Tau去磷酸化测定的完全重建和涉及调节亚基Bα的异源三聚体PP 2A全酶的晶体结构。我们表明,Bα特异性和显着促进磷酸化的Tau在我们的重建测定的去磷酸化。Bα亚基包含一个七叶β螺旋桨,螺旋桨中心有一个酸性底物结合沟。β螺旋桨在一个突出的β发夹臂的帮助下锁定在PP 2A支架亚基的脊上。结构导向突变研究揭示了PP 2A介导的Tau去磷酸化的基础。
Protein phosphatase 2A (PP2A) regulates many essential aspects of cellular physiology. Members of the regulatory B/B55/PR55 family are thought to play a key role in the dephosphorylation of Tau, whose hyperphosphorylation contributes to Alzheimer's disease. The underlying mechanisms of the PP2A-Tau connection remain largely enigmatic. Here, we report the complete reconstitution of a Tau dephosphorylation assay and the crystal structure of a heterotrimeric PP2A holoenzyme involving the regulatory subunit Bα. We show that Bα specifically and markedly facilitates dephosphorylation of the phosphorylated Tau in our reconstituted assay. The Bα subunit comprises a seven-bladed β propeller, with an acidic, substrate-binding groove located in the center of the propeller. The β propeller latches onto the ridge of the PP2A scaffold subunit with the help of a protruding β hairpin arm. Structure-guided mutagenesis studies revealed the underpinnings of PP2A-mediated dephosphorylation of Tau.
DOI: 10.1038/nsmb1254
发表时间: 2007-06-01
影响因子: 16.8
作者:
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