关键的NLS氨基酸中的自然突变调节了PRRSV中核等离子体的穿和复制效率
Xianchang Zhu1, Yang Xia2, Qian Lei1
1Institute of Zoonosis, College of Public Health, Zunyi Medical University, Zunyi, Guizhou, China.
Frontiers in microbiology
|July 21, 2025
概括
高致病性猪生殖和呼吸系统综合征病毒 (HP-PRRSV) 由于其N.蛋白的核进口增加,其复制性增加. 在N蛋白中发生突变.
科学领域:
- 病毒学 病毒学
- 分子生物学分子生物学
- 动物健康 动物健康
背景情况:
- 高致病性猪生殖和呼吸系统综合征病毒 (HP-PRRSV) 导致严重的猪发病率和死亡率.
- 与经典的PRRSV相比,HP-PRRSV在N蛋白的核定位信号 (NLS) 中表现出一种特定的突变 (氨基酸46).
研究的目的:
- 调查HP-PRRSV.增强复制背后的分子机制.
- 确定N蛋白核等离子体穿的作用及其与HP-PRRSV病毒性中核运输受体的相互作用.
主要方法:
- 在HP-PRRSV和经典PRRSV之间对N蛋白核等离子体穿效率的比较分析.
- 在N蛋白进口中涉及的核载体受体的鉴定 (KPNB1,KPNA1,KPNA2,KPNA6,KPNA7).
- 评估KPNB1和KPNA1表达的调节后的病毒复制;蛋白质结合模拟和动力分析.
主要成果:
- 惠普-PRRSV N蛋白比经典的PRRSV N蛋白更有效地表现出核等离子体穿.
- 感染细胞中的KPNB1和KPNA1mRNA表达水平因菌株而异.
- 减少KPNA1和/或KPNB1的表达减少了HP-PRRSV的复制.
- 氨基酸46突变改变了N蛋白结合动力学和与KPNA1和KPNB1.1结合的模式.
结论:
- 由NLS突变驱动的HP-PRRSV N蛋白的增强核等离子体穿,显著提高了病毒复制效率.
- 这项研究通过专注于核进口机制,为HP-PRRSV病原体提供了新的见解.
- 调查结果为制定控制PRRSV的战略提供了基础.
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