CELL:颜宁组发现儿童遗传神经疾病的结构基础

2020-06-16 MedSci原创 MedSci原创

溶酶体胆固醇的排出需要两种蛋白质,NPC1和NPC2,它们的缺陷是导致Niemann-Pick病C型(NPC)的原因。

溶酶体胆固醇的排出需要两种蛋白质,NPC1和NPC2,它们的缺陷是导致Niemann-Pick病C型(NPC)的原因。

最近,颜宁课题组提出了NPC1和NPC2系统的结构表征,揭示了胆固醇从NPC2传递到NPC1的低pH依赖性的跨膜(TM)域的分子基础。

在pH值8.0时,在纳米盘和洗涤剂中分别获得了分辨率为3.6 Å和3.0 Å的NPC1的结构,两者十分类似,揭示了连接N端域(NTD)和跨膜甾醇感应域(SSD)的隧道。

在pH值5.5时,NTD表现出两种构象,表明胆固醇传递到隧道的运动。在隧道的膜边界发现了一个假定的胆固醇分子,TM2向SSD上的表面口袋的形成移动。

最后,在pH5.5的条件下,研究人员获得了4.0 Å分辨率的NPC1-NPC2复合物结构,阐明了胆固醇从NPC2向NPC1(NTD)递送的分子基础。

 

原始出处:

Hongwu Qian et al. Structural Basis of Low-pH-Dependent Lysosomal Cholesterol Egress by NPC1 and NPC2, CELL (2020). DOI:https://doi.org/10.1016/j.cell.2020.05.020

 

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    2020-07-09 维他命
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    2020-06-18 syscxl
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