Structure of the Wilson disease copper transporter ATP7B.

Structure of the Wilson disease copper transporter ATP7B.
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DOI:
10.1126/sciadv.abl5508
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发表时间:
2022-03-04
期刊:
影响因子:
13.6
通讯作者:
Yuan P
Yuan P
中科院分区:
综合性期刊1区
文献类型:
--
作者:
Bitter RM;Oh S;Deng Z;Rahman S;Hite RK;Yuan P

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ATP 7A和ATP 7 B是两种同源的铜转运P1 B型ATP酶,在细胞铜稳态中起关键作用,突变分别引起Menkes病和Wilson病。ATP 7 A/B含有由膜转运结构域和三个胞质结构域(A、P和N结构域)组成的P型ATP酶核心,以及包含六个连续金属结合结构域的独特氨基末端。在这里,我们提出了一个冷冻电子显微镜结构的青蛙ATP 7 B在无铜状态。与A和P结构域相互作用,金属结合结构域准备发挥铜依赖性调节ATP水解耦合跨膜铜转运。一个带负电荷的残基环排列在细胞质铜入口处,推测该入口由位于中心的保守碱性残基门控。在膜内,铜配位配体的网络描绘了一个逐步的铜转运途径。这项工作提供了对ATP 7蛋白的结构和功能的第一次一瞥,并促进了对疾病机制的理解和合理治疗的发展。Cryo-EM揭示了Wilson病铜转运蛋白ATP 7 B的结构。
ATP7A and ATP7B, two homologous copper-transporting P1B-type ATPases, play crucial roles in cellular copper homeostasis, and mutations cause Menkes and Wilson diseases, respectively. ATP7A/B contains a P-type ATPase core consisting of a membrane transport domain and three cytoplasmic domains, the A, P, and N domains, and a unique amino terminus comprising six consecutive metal-binding domains. Here, we present a cryo–electron microscopy structure of frog ATP7B in a copper-free state. Interacting with both the A and P domains, the metal-binding domains are poised to exert copper-dependent regulation of ATP hydrolysis coupled to transmembrane copper transport. A ring of negatively charged residues lines the cytoplasmic copper entrance that is presumably gated by a conserved basic residue sitting at the center. Within the membrane, a network of copper-coordinating ligands delineates a stepwise copper transport pathway. This work provides the first glimpse into the structure and function of ATP7 proteins and facilitates understanding of disease mechanisms and development of rational therapies. Cryo-EM reveals the structure of the Wilson disease copper transporter ATP7B.
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