在登革热和寨卡病毒感染期间,STT3A介导的大型蛋白质复合体组装
Tao Liu1, Natasha W Hanners2, Huangheng Tao1
1Center for Immunotherapy & Precision Immuno-Oncology, Lerner Research Institute, Cleveland Clinic, Cleveland, OH 44195, USA.
iScience
|July 4, 2025
概括
寡糖糖转移酶 (OST) 复合物的STT3A亚复合体作为病毒蛋白组合的支架,对登革热病毒 (DENV) 和寨卡病毒 (ZIKV) 复制至关重要. 一种破坏这种复杂的化合物抑制了病毒感染.
科学领域:
- 病毒学 病毒学
- 分子生物学分子生物学
- 细胞生物学 细胞生物学
背景情况:
- 哺乳动物细胞中的弗拉维病毒复制取决于宿主寡糖糖转移酶 (OST) 复合体.
- OST复合体的酶性N-糖化活性对于病毒感染并不重要,这表明它有非正规的作用.
- 在弗拉维病毒感染中OST参与的确切机制尚不清楚.
研究的目的:
- 阐明OST复合体,特别是STT3A亚复合体在病毒复制中的特定作用.
- 为了确定感染期间涉及OST复合体的宿主因素和病毒相互作用.
- 通过准OST复合体,发现可以抑制黄病毒感染的小分子.
主要方法:
- 研究了STT3A亚复合体 (STT3A和DC2) 对登革热病毒 (DENV) 和寨卡病毒 (ZIKV) 感染的要求.
- 分析了STT3A亚复合体在DENV感染期间核化大型蛋白质复合体组件中的作用.
- 利用小分子化合物 (NSC-323241) 破坏STT3A介导的复合物形成并评估其对病毒感染的影响.
主要成果:
- 在DENV和ZIKV感染中,OST的STT3A亚复合体是必不可少的.
- 在DENV感染期间,STT3A作为支架起作用,核化一个涉及OST子单元,转位蛋白和病毒非结构蛋白的超大蛋白质复合体.
- 这种巨型蛋白质复合物的完整性对于支持病毒复制至关重要.
- 化合物NSC-323241有效地破坏STT3A介导的复合组合,并抑制DENV和ZIKV感染.
结论:
- STT3A亚复合体在病毒感染中起着关键的支架作用,独立于其酶性N-糖化活性.
- 对STT3A介导的大型蛋白质复合体组合的破坏代表了对DENV和ZIKV等黄状病毒的潜在治疗策略.
- 这项研究提供了一个全面的分子理解的OST复合的参与,在flavivirus复制.
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