人类SLC11蛋白DMT1和NRAMP1的金属离子运输的结构基础
Márton Liziczai1, Ariane Fuchs1, Cristina Manatschal2
1Department of Biochemistry, University of Zurich, Zurich, Switzerland.
Nature communications
|January 17, 2025
概括
研究人员阐明了包括DMT1和NRAMP1在内的人类SLC11蛋白质的结构,揭示了它们对必不可少的金属离子运输和质子共运输的机制,这对于营养吸收和抗感染能力至关重要.
科学领域:
- 结构生物学 结构生物学
- 分子运输分子的运输.
- 人体生理学 人体生理学
背景情况:
- 铁和是重要的营养素,通过SLC11蛋白家族的介导,通过细胞膜进行运输.
- 人类SLC11家族成员,DMT1和NRAMP1,对于金属离子吸收,分布,抗感染和营养回收至关重要.
- 以前对SLC11蛋白结构及其功能相关性的理解仍然有限.
研究的目的:
- 为了确定人体DMT1和NRAMP1.1的冷电子显微镜结构.
- 阐明DMT1和NRAMP1结构及其在金属离子传输中的功能性质之间的关系.
主要方法:
- 使用冷电子显微镜 (cryo-EM) 解析了DMT1和NRAMP1.1的结构.
- 进行了功能性测试,以将结构发现与蛋白质运输能力相关联.
主要成果:
- 这项研究介绍了人类DMT1和NRAMP1.1的冷EM结构.
- 两种蛋白质都被证明可以催化选择性金属离子 (Fe2+,Mn2+) 运输与质子 (H+) 配合运输.
- 此外,发现DMT1和NRAMP1能够调解未合的质子流.
- 与 prokaryotic 同类物不同的结构特征有助于增强过渡金属离子选择性.
结论:
- 确定的结构为人类SLC11蛋白质对金属离子运输机制提供了新的见解.
- 这些发现突出了这些蛋白质在选择性金属运输和质子流动中的双重作用.
- 结构的独特性是人类SLC11转运器对过渡金属的增强选择性的基础.
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