在SARS-CoV-2尖端蛋白的多基分裂部位的序列糖基化调节病毒活性
Shengjun Wang1,2, Wei Ran3, Lingyu Sun1
1School of Pharmaceutical Sciences, Sun Yat-sen University, Guangzhou, China.
Nature communications
|May 16, 2024
概括
由GalNAc-T3和T7启动的宿主细胞糖化,抑制了SARS-CoV-2尖端蛋白处理和病毒感染. 病毒变种进化了对这种宿主防御机制的耐药性和易感性.
科学领域:
- 病毒学 病毒学
- 葡萄糖生物学 葡萄糖生物学
- 分子生物学分子生物学
背景情况:
- 严重急性呼吸道综合征冠状病毒2 (SARS-CoV-2) 尖端蛋白的多基素分裂部位对于病毒的进入和感染至关重要.
- 在这个部位调节氨酸激活的精确机制在很大程度上是未知的.
研究的目的:
- 调查O-糖化在调节SARS-CoV-2furin裂变部位中的作用.
- 阐明宿主病毒相互作用,包括糖化和病毒变异演变.
主要方法:
- 研究了GalNAc-T3和T7酶对SARS-CoV-2尖端蛋白质糖化中的作用.
- 分析了将尖端蛋白纳入病毒样颗粒 (VLP) 的情况.
- 在SARS-CoV-2变种 (alpha,delta,omicron) 中检查了糖化模式.
主要成果:
- GalNAc-T3和T7共同在尖端蛋白的素裂解部位诱导O-糖化,抑制了素的加工.
- 糖化抑制了尖端蛋白质在VLP中融入,并影响病毒感染.
- SARS-CoV-2 变种对 GalNAc-T3 / T7 介导的糖化酶具有差异性抵抗/敏感性,Omicron 显示恢复了敏感性.
- 尖蛋白组装到VLP取决于furin分裂的尖和病毒膜蛋白之间的相互作用.
结论:
- 糖化作为宿主细胞防御机制,通过阻碍氨酸介导的裂变和病毒感染性来对抗SARS-CoV-2.
- SARS-CoV-2 变种的进化表明与宿主糖化机制的适应性相互作用.
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