胆酸载体和HBV受体NTCP的结构
Jinta Asami1, Kanako Terakado Kimura2, Yoko Fujita-Fujiharu3,4,5
1Graduate School of Pharmaceutical Sciences, The University of Tokyo, Tokyo, Japan.
Nature
|May 17, 2022
概括
乙型肝炎病毒 (HBV) 使用大包膜糖蛋白 (LHBs) 结合宿主细胞受体. 这项研究揭示了通过NTCP进入HBV的结构基础,为了解病毒与宿主相互作用提供了一个框架.
科学领域:
- 结构生物学
- 病毒学
- 肝病学
背景情况:
- 慢性乙型肝炎病毒 (HBV) 感染全球超过2.9亿人,导致肝硬化和肝癌.
- 乙型肝炎病毒进入肝细胞需要病毒大包膜糖蛋白 (LHBs) 和宿主受体甲酸共运输聚 (NTCP) 之间的相互作用.
- 在HBV与NTCP相互作用的确切分子机制尚不清楚.
研究的目的:
- 阐明HBV与其宿主细胞进入受体NTCP之间的相互作用的结构基础.
- 通过NTCP了解依赖于的胆酸运输机制.
- 为开发针对HBV的新型抗病毒策略提供结构框架.
主要方法:
- 使用冷电子显微镜 (cryo-EM) 来确定人类,牛和老鼠NTCP在apo和preS1结合状态中的结构.
- 进行了突变和运输测定以验证拟议的结合方式和功能影响.
- 结构分析与生化数据相结合,以解释NTCP中的HBV不敏感突变.
主要成果:
- 在NTCP中发现一个覆盖膜的道,
- 人类NTCP与LHBs preS1域结合的结构表明,preS1和NTCP基质在道的细胞外开口上竞争着相同的结合点.
- 对前S1-NTCP相互作用的分析提供了对自然发生的HBV耐药性突变的机制性见解.
结论:
- 该研究提供了NTCP的高分辨率结构,详细介绍了其传输机制和与HBV的相互作用.
- 通过NTCP建立了HBV识别的结构框架,阐明了病毒进入的分子基础.
- 这些发现提供了对胆汁酸传输的机制理解,并为针对性HBV治疗铺平了道路.
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