Riemerella anatipestifer的外膜蛋白OMP76通过与子补充因子维特罗尼克因子结合,有助于补充逃避和毒性
Sen Li1,2,3,4, Yanhua Wang1,2,3,4, Rongkun Yang1,2,3,4
1College of Veterinary Medicine, Huazhong Agricultural University, Wuhan, China.
Virulence
|June 16, 2023
概括
Riemerella anatipestifer使用外膜蛋白 OMP76 结合子维特罗内克丁,避免补充介导的杀死. 这种OMP76对细菌毒性和生存至关重要,为新的家禽疫苗提供了潜在的目标.
科学领域:
- 细菌学 细菌学是一门学科.
- 免疫学 免疫学 免疫学
- 禽类病理学 禽类病理学
背景情况:
- 瑞梅瑞拉 (Riemerella anatipestifer) 是一个重要的家禽病原体.
- 病原性细菌逃避血清补充剂,这是一个关键的免疫防御.
- 维特罗涅 (Vn) 调节补体并抑制膜攻击复合体 (MAC) 的形成.
- 微生物经常使用外膜蛋白 (OMP) 来招募Vn以逃避补体.
研究的目的:
- 为了表征Riemerella anatipestifer外膜蛋白 (OMPs) 与子维特龙菌素 (dVn) 相互作用.
- 阐明R. anatipestifer.使用的补充逃避机制.
- 确定针对R. anatipestifer感染的新型疫苗开发的潜在目标.
主要方法:
- 远西部测试被用来确定与dVn.结合的OMP.
- 在使用dVn和子血清治疗后,野生型和突变R. anatipestifer菌株进行了比较.
- 用于确认的是表达OMP76的大肠杆菌菌株.
- 使用三级结构分析和同质模型,精确确定了OMP76.6中的关键氨基酸.
主要成果:
- 在R. anatipestifer的外膜蛋白76 (OMP76) 显示强烈的结合于子维特罗涅丁 (dVn).
- 在OMP76的细胞外循环中的特定氨基酸集群调解dVn相互作用.
- dVn与OMP76结合抑制了MAC在细菌表面的沉积,提高了子血清中的生存率.
- 一种缺乏OMP76 (ΔOMP76) 的突变菌株表现出显著减弱的毒性,减少的粘附性和入侵能力.
结论:
- OMP76是Riemerella anatipestifer的一个关键毒性因子.
- 通过OMP76招募子维特龙菌素是逃避子天生的免疫力的关键机制.
- OMP76是开发针对R. anatipestifer.的亚单元疫苗的一个有希望的目标.
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