对影响H5血凝素受体结合偏好的点突变的理论研究
Quoc Bao Ngo1, André H Juffer2
1Faculty of Biochemistry and Molecular Medicine, University of Oulu, PO Box 5400, Oulu 90014, Finland.
Computational biology and chemistry
|August 31, 2024
概括
在H5N1流感血凝素 (HA) 蛋白中,单个突变 (D94N) 可以将其结合偏好从鸟类转移到人类受体. 这项分子动力学研究解释了这种突变如何影响病毒受体相互作用和传播潜力.
科学领域:
- 病毒学 病毒学
- 分子生物学分子生物学
- 生物物理学的生物物理.
背景情况:
- 禽流感A H5N1病毒导致鸟类严重的呼吸系统疾病,导致严重的经济损失.
- 病毒表面的Hemagglutinin (HA) 糖蛋白通过与酸受体结合,调解宿主细胞的进入.
- 虽然H5N1目前缺乏有效的人与人之间的传播,但HA中的突变可以改变受体特异性.
研究的目的:
- 阐明H5 HA蛋白中的特定突变 (D94N) 改变其糖受体结合偏好的分子机制.
- 了解这种突变如何影响H5N1 HA与禽类 (SAα2,3Gal) 和人类 (SAα2,6Gal) 酸受体之间的相互作用.
主要方法:
- 用分子动力学 (MD) 模拟来研究与H5 HA中的D94N突变相关的结构和能量变化.
- 分析的重点是HA受体结合口袋中的静电相互作用和HA-甘氨酸复合物的稳定性.
主要成果:
- 发现D94N突变改变了HA受体结合口袋周围的静电相互作用模式.
- 这种改变导致H5 HA和禽类SAα2,3Gal受体之间的复合物的稳定性下降.
- 对人类类型的SAα2,6Gal受体没有观察到D94N突变对复合体稳定性的负面影响,这归因于其拓适应性.
结论:
- 在H5N1 HA中D94N突变可以促进从鸟类类型转向人类类型的受体结合偏好.
- 这种开关是由改变的静电相互作用和与各种酸受体的差异复合体稳定性介导的.
- 了解这种突变对于评估禽流感病毒的流行病潜力至关重要.
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