Modeling of full-length Piezo1 suggests importance of the proximal N-terminus for dome structure.

Modeling of full-length Piezo1 suggests importance of the proximal N-terminus for dome structure.
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DOI:
10.1016/j.bpj.2021.02.003
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发表时间:
2021-04-20
影响因子:
3.4
通讯作者:
Kalli AC
Kalli AC
中科院分区:
生物学3区
文献类型:
--
作者:
Chong J;De Vecchis D;Hyman AJ;Povstyan OV;Ludlow MJ;Shi J;Beech DJ;Kalli AC

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Piezo 1形成机械激活的钙渗透性非选择性阳离子通道,在许多细胞类型中具有重要功能。存在C-末端区域的结构数据,但我们缺乏关于N-末端区域以及整个通道如何与脂质双层相互作用的信息。在这里,我们使用计算方法来预测全长Piezo 1的三维结构,并在非对称膜中进行模拟。该模型提出了许多新的见解:1)Piezo 1在膜中创建了一个延伸到蛋白质半径之外的三叶圆顶,2)Piezo 1通过与胆固醇和磷脂酰肌醇4,5-二磷酸(PIP 2)分子的优先相互作用改变了其附近的脂质环境,3)胆固醇改变了圆顶的深度和PIP 2结合偏好。在体外改变胆固醇浓度抑制Piezo 1活性的方式补充我们的一些计算结果。这些数据表明Piezo 1的N-末端区域对于圆顶结构和膜胆固醇与PIP 2相互作用的重要性。
Piezo1 forms a mechanically activated calcium-permeable nonselective cation channel that is functionally important in many cell types. Structural data exist for C-terminal regions, but we lack information about N-terminal regions and how the entire channel interacts with the lipid bilayer. Here, we use computational approaches to predict the three-dimensional structure of the full-length Piezo1 and simulate it in an asymmetric membrane. A number of novel insights are suggested by the model: 1) Piezo1 creates a trilobed dome in the membrane that extends beyond the radius of the protein, 2) Piezo1 changes the lipid environment in its vicinity via preferential interactions with cholesterol and phosphatidylinositol 4,5-bisphosphate (PIP2) molecules, and 3) cholesterol changes the depth of the dome and PIP2 binding preference. In vitro alteration of cholesterol concentration inhibits Piezo1 activity in a manner complementing some of our computational findings. The data suggest the importance of N-terminal regions of Piezo1 for dome structure and membrane cholesterol and PIP2 interactions.
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