Active conformation of the p97-p47 unfoldase complex.

Active conformation of the p97-p47 unfoldase complex.
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DOI:
10.1038/s41467-022-30318-3
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发表时间:
2022-05-12
影响因子:
16.6
通讯作者:
--
中科院分区:
综合性期刊1区
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--
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p97 AAA+ ATP酶是蛋白质稳态的重要且丰富的调节剂,其在解折叠泛素化底物中起核心作用。在这里,我们报告了两个冷冻电镜结构的人p97在复杂的p47适配器。其中一种构象是六重对称的,对应于先前报道的p97结构,并且缺乏结合底物。另一种结构采用螺旋构象,显示底物通过p97六聚体的孔以延伸构象运行,并且类似于其他AAA解折叠酶报道的结构。这些发现支持了p97利用“手-手”机制的模型,其中底物的两个残基被移位用于水解两个ATP,两个p97 AAA ATP酶环中的每一个中的一个。蛋白质组学分析支持这样的模型,即一个p97复合物可以结合多个底物衔接子或结合配偶体,并且可以处理具有多种类型的泛素修饰的底物。p97解折叠酶是一种必需的和丰富的酶,其将其底物从大分子复合物和细胞器膜分离。在这里,作者确定了人类p97在展开真实底物时的结构。
The p97 AAA+ATPase is an essential and abundant regulator of protein homeostasis that plays a central role in unfolding ubiquitylated substrates. Here we report two cryo-EM structures of human p97 in complex with its p47 adaptor. One of the conformations is six-fold symmetric, corresponds to previously reported structures of p97, and lacks bound substrate. The other structure adopts a helical conformation, displays substrate running in an extended conformation through the pore of the p97 hexamer, and resembles structures reported for other AAA unfoldases. These findings support the model that p97 utilizes a “hand-over-hand” mechanism in which two residues of the substrate are translocated for hydrolysis of two ATPs, one in each of the two p97 AAA ATPase rings. Proteomics analysis supports the model that one p97 complex can bind multiple substrate adaptors or binding partners, and can process substrates with multiple types of ubiquitin modification. The p97 unfoldase is an essential and abundant enzyme that segregates its substrates from macromolecular complexes and organelle membranes. Here, authors determined the structure of human p97 in the act of unfolding an authentic substrate.
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