Structures of a Complete Human V-ATPase Reveal Mechanisms of Its Assembly.

Structures of a Complete Human V-ATPase Reveal Mechanisms of Its Assembly.
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一个完整的人类v - atp酶的结构揭示其组装机制。

DOI:
10.1016/j.molcel.2020.09.029
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发表时间:
2020-11-05
期刊:
影响因子:
16
通讯作者:
Fu TM
Fu TM
中科院分区:
生物学1区
文献类型:
--
作者:
Wang L;Wu D;Robinson CV;Wu H;Fu TM

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囊泡型或空泡型腺苷三磷酸酶(V-ATP酶)是ATP驱动的质子泵,由用于ATP水解的细胞质V1复合物和用于质子转移的膜包埋的Vo复合物组成。它们在真核生物细胞内囊泡、细胞器和细胞外环境的酸化中起重要作用。在这里,我们报告的冷冻电子显微镜结构的人V-ATP酶在三个旋转状态,分辨率高达2.9 μ m。借助质谱,我们建立了所有已知的蛋白质亚基与相关的N-连接的聚糖,并确定在Vo复合物中的糖脂和磷脂。我们将ATP 6AP 1定义为Vo复合物组装的结构中心,因为它连接到C环内的多个Vo亚基和磷脂。糖脂和糖基化的Vo亚基形成对V-ATP酶折叠、定位和稳定性至关重要的腔聚糖涂层。总的来说,我们的研究提供了依赖于ATP 6AP 1,聚糖和脂质的综合作用的V-ATP酶组装和生物合成的机制。Wang等人报道了人V-ATP酶组装的机制。冷冻电镜结合质谱分析表明,蛋白质亚基、聚糖、糖脂和磷脂是V-ATP酶的基本组成部分。值得注意的是,亚基ATP 6AP 1、聚糖和脂质在V-ATP酶组装和生物发生中起重要作用。
Vesicular- or vacuolar-type adenosine triphosphatases (V-ATPases) are ATP-driven proton pumps comprised of a cytoplasmic V1 complex for ATP hydrolysis and a membrane embedded Vo complex for proton transfer. They play important roles in the acidification of intracellular vesicles, organelles, and extracellular milieu in eukaryotes. Here we report cryo-electron microscopy structures of human V-ATPase in three rotational states at up to 2.9 Å resolution. Aided by mass spectrometry, we build all known protein subunits with associated N-linked glycans, and identify glycolipids and phospholipids in the Vo complex. We define ATP6AP1 as a structural hub for Vo complex assembly as it connects to multiple Vo subunits and phospholipids inside the c-ring. The glycolipids and the glycosylated Vo subunits form a luminal glycan coat critical for V-ATPase folding, localization and stability. Collectively, our studies provide mechanisms of V-ATPase assembly and biogenesis that rely on the integrated roles of ATP6AP1, glycans and lipids. Wang et al. report the mechanisms of human V-ATPase assembly. Cryo-EM structures of human V-ATPase combined with mass spectrometry analysis reveal that the protein subunits, glycans, glycolipids, and phospholipids are essential components of V-ATPase. Of note, subunit ATP6AP1, glycans, and lipids play important roles in V-ATPase assembly and biogenesis.
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