Cryo-EM structure of the Hippo signaling integrator human STRIPAK.

Cryo-EM structure of the Hippo signaling integrator human STRIPAK.
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DOI:
10.1038/s41594-021-00564-y
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发表时间:
2021-03
影响因子:
16.8
通讯作者:
Luo X
Luo X
中科院分区:
生物学1区
文献类型:
--
作者:
Jeong BC;Bae SJ;Ni L;Zhang X;Bai XC;Luo X

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纹状体相互作用磷酸酶和激酶(STRIPAK)复合物是一种大的多亚基蛋白磷酸酶2A(PP 2A)组装体,它整合了Hippo通路中的多种细胞信号,以调节细胞增殖和存活。这个关键复合体的结构和组装机制知之甚少。使用cryo-EM,我们以3.2 μ m的分辨率确定了包含PP 2AA、PP 2AC、STRN 3、STRIP 1和MOB 4的人STRIPAK核心的结构。与典型的三聚体PP 2A全酶不同,STRIPAK含有四个拷贝的STRN 3和一个拷贝的PP 2AA-C异源二聚体、STRIP 1和MOB 4。STRN 3卷曲螺旋结构域形成将复合物连接在一起的伸长的同源四聚体支架。肌醇六磷酸(IP 6)被鉴定为STRIP 1的结构辅因子。亚基界面关键残基的突变破坏了STRIPAK的完整性,导致Hippo通路激活异常。因此,STRIPAK被确定为具有四个拷贝的调节STRN 3的非经典PP 2A复合物,用于增强信号整合。
The striatin-interacting phosphatase and kinase (STRIPAK) complex is a large multisubunit protein phosphatase 2A (PP2A) assembly that integrates diverse cellular signals in the Hippo pathway to regulate cell proliferation and survival. The architecture and assembly mechanism of this critical complex are poorly understood. Using cryo-EM, we determine the structure of the human STRIPAK core comprising PP2AA, PP2AC, STRN3, STRIP1, and MOB4 at 3.2 Å resolution. Unlike the canonical trimeric PP2A holoenzyme, STRIPAK contains four copies of STRN3 and one copy of each the PP2AA–C heterodimer, STRIP1, and MOB4. The STRN3 coiled-coil domains form an elongated homotetrameric scaffold that links the complex together. An inositol hexakisphosphate (IP6) is identified as structural cofactor of STRIP1. Mutations of key residues at subunit interfaces disrupt the integrity of STRIPAK, causing aberrant Hippo pathway activation. Thus, STRIPAK is established as a noncanonical PP2A complex with four copies of regulatory STRN3 for enhanced signal integration.
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