免疫规避的结构演变决定性形状病原体宿主热带性宿主热带性
Ashley L Marcinkiewicz1, Kalvis Brangulis2,3, Alan P Dupuis1
1New York State Department of Health, Division of Infectious Diseases, Wadsworth Center, Albany, NY 12208.
概括
在Borrelia burgdorferi外表面蛋白CspZ中微小的变异通过改变补充因子H结合来驱动宿主热带. 这种蛋白质图案调节了细菌在不同储库宿主中的感染性和传播,揭示了病原体适应的进化机制.
科学领域:
- 微生物学 微生物学
- 免疫学 免疫学 免疫学
- 进化生物学 进化生物学
背景情况:
- 病原体宿主热带性或宿主偏好在传染病动态中至关重要.
- 莱姆病细菌Borrelia burgdorferi (Bb) 呈现出与动物或鸟类宿主适应的独特变体,使其成为研究宿主热带的模型.
- Bb的外表面蛋白CspZ与补充因子H (FH) 结合,以逃避免疫清除并促进传播.
研究的目的:
- 研究Borrelia burgdorferi CspZ变种实现宿主特定感染性的分子机制.
- 确定CspZ的序列变化如何影响其与宿主H因子的结合以及随后的细菌传播.
- 为了阐明Borrelia burgdorferi宿主热带的进化基础.
主要方法:
- 确定了CspZ-人因子H复合物的晶体结构.
- 在CspZ FH绑定接口内识别了序列变化.
- 通过交换CspZ变体之间的分离区域并评估动物和鸟类模型中的传染性,进行了功能性测试.
- 对CspZ变体和相关宿主特异性表型的家族遗传学分析.
主要成果:
- 在CspZ FH结合接口中的微小序列变化赋予了对动物和鸟类H因子的差异性结合.
- 在CspZ变异之间交换这些变量区域改变了各自宿主中的细菌传播.
- 独特的CspZ遗传系系与特定的宿主相关的补充依赖表型相关.
结论:
- 在CspZ中,单个短的蛋白质基因可以显著调节病原体宿主热带.
- 通过CspZ对宿主特定的FH结合是推动Borrelia burgdorferi适应不同水库宿主的一个关键机制.
- 了解这些分子和进化机制为病原体的出现和宿主特异性提供了洞察力.
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