通过病毒受体同类体限制乙型肝炎病毒的结构基础
Kaho Shionoya1,2,3, Jae-Hyun Park4,5, Toru Ekimoto6
1Department of Virology II, National Institute of Infectious Diseases, Tokyo, Japan.
Nature communications
|October 25, 2024
概括
NTCP通过Arg158的固体碰撞和Asn86.6的动态表面相互作用来阻止病毒preS1结合,从而限制乙型肝炎病毒 (HBV). 胆汁酸进一步阻止病毒的进入.
科学领域:
- 结构生物学 结构生物学
- 病毒学 病毒学
- 生物化学 生化学
背景情况:
- 乙型肝炎病毒 (HBV) 通过陶酸共运输多 (NTCP) 受体感染人类.
- 的NTCP (mNTCP) 对HBV感染具有抗性,这表明受体与病毒相互作用的差异.
- 了解这些差异对于开发抗病毒策略至关重要.
研究的目的:
- 阐明mNTCP限制HBV感染的结构机制.
- 与人类NTCP (hNTCP) 相比,确定对mNTCP病毒受体功能的丧失负责的特定分子决定因素.
主要方法:
- 低温电子显微镜 (cryo-EM) 用于确定mNTCP的结构.
- 结构上的叠加与hNTCP-preS1复合体.
- 基于细胞的突变分析,以评估特定氨基酸残留物的功能影响.
主要成果:
- 在mNTCP中的Arg158会产生固体碰撞,防止HBV preS1蛋白嵌入胆酸结合道.
- 在mNTCP的细胞外表面上的Asn86对preS1动态的限制比hNTCP中的Lys86要小,导致结合不稳定.
- 在mNTCP道内的长链结合胆酸通过它们的尾链,在固体上阻碍了preS1的结合.
结论:
- 在mNTCP内的多个位点起到分子屏障的作用,严格限制HBV的进入.
- 在残留158和86的结构差异,以及胆酸的影响,解释了mNTCP对HBV的耐药性.
- 这为了解HBV易感性中的特定物种差异提供了结构基础.
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