尼塞里亚粘附素A (NadA) 结合人类的Siglec-5和Siglec-14具有很高的亲和力,并促进细菌的粘附/入侵
Barbara Benucci1, Zaira Spinello1, Valeria Calvaresi1,2
1GSK, Siena, Italy.
mBio
|July 23, 2024
概括
尼塞里亚粘附素A (NadA) 与Siglec-5和Siglec-14受体结合,对于脑膜炎球菌的粘附和入侵至关重要. 这一发现有助于人们更好地了解Neisseria meningitidis在感染期间如何向免疫细胞.
科学领域:
- 微生物学和免疫学
- 分子生物学分子生物学
- 疫苗开发 疫苗开发
背景情况:
- 尼塞里亚粘附蛋白A (NadA) 是Neisseria meningitidis*血清组B (MenB) 的一个关键的表面蛋白.
- 纳达被包括在4CMenB疫苗中,并调解细菌的粘附和入侵宿主细胞.
- 特定的细胞受体和nadA在脑膜炎球菌致病的生理作用在很大程度上仍未被定义.
研究的目的:
- 为了识别Neisserial adhesin A (NadA) 的宿主细胞受体.
- 阐明NadA受体相互作用在*Neisseria meningitidis*粘附和入侵中的作用.
- 了解纳达对脑膜炎球菌病原和宿主免疫逃避策略的贡献.
主要方法:
- 在2846个人类和297个小鼠表面/分泌蛋白质的蛋白质微阵列查中,使用了复合NADA.
- 纳达受体相互作用的生物化学特征,包括结合亲和力 (Kd) 的确定.
- -交换质谱 (HDX-MS) 用于绘制Siglec-5上的Nada结合点.
主要成果:
- 纳达证明有效地与Siglec-5和Siglec-14结合,被确定为其主要受体.
- 负责酸识别的Siglec-5的N终端域被确定为NADA结合部位.
- 西格莱克-5和西格莱克-14的表达增强了N. meningitidis的粘附和宿主细胞的入侵,而西格莱克-9没有.
结论:
- 西格莱克-5和西格莱克-14作为Neisserial粘附蛋白A (NadA) 的细胞受体起作用.
- NadA-Siglec-5/14相互作用在 *Neisseria meningitidis* 粘附和入侵宿主细胞中起着重要的作用.
- 这些发现揭示了 *N. meningitidis* 针对免疫细胞的新机制,强调了 NadA 在急性感染中的重要性.
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