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Updated: Jun 26, 2025

In Vitro Assay of Bacterial Adhesion onto Mammalian Epithelial Cells

In Vitro Assay of Bacterial Adhesion onto Mammalian Epithelial Cells

Published on: May 16, 2011

重复模块和N链 glycans 定义了一个关键的 enterotoxigenic E. 的结构和抗原性. 大肠杆菌粘附素

Zachary T Berndsen¹, Marjahan Akhtar², Mahima Thapa³

¹Department of Integrative Structural and Computational Biology, Scripps Research, La Jolla, CA, USA.

bioRxiv : the preprint server for biology

|May 20, 2024

概括

肠毒性大肠杆菌 (ETEC) 的严重程度在A血型个体中增加. 在EtpA的粘附中.

科学领域:

微生物学和免疫学
葡萄糖生物学葡萄糖生物学
疫苗开发疫苗开发

背景情况:

肠毒性大肠杆菌 (ETEC) 在全球范围内引起严重的传染性腹,特别是在儿童中.
腹的严重程度在患有A血型 (bgA) 个体中明显较高,这是由于特定的病原体与宿主相互作用.
EtpA粘合素是ETEC与肠道细胞上的bgA甘氨酸相互作用的关键因素.

研究的目的:

阐明EtpA调解ETEC-bgA相互作用的分子机制.
了解EtpA如何刺激自适应性免疫反应,为疫苗设计提供信息.

主要方法:

EtpA.的局部导向突变发生.
质谱学 (MS) 用于糖基化映射.
分离多克隆抗体 (pAbs) 和单克隆抗体 (mAbs).
电子显微镜 (cryo-EM) 用于抗体-EtpA复合物的结构确定.
基于电子显微镜的表位图绘制.

主要成果:

bgA和抑制的mAbs都与EtpA的C端重复域结合,这对粘附至关重要.
多发性硬化症显示出EtpA的广泛和异质的N链 glycosylation.
低温EM结构显示mAbs与EtpA上的含有甘氨酸的表位物相互作用.
位图绘制表明抗体向不同的区域,包括中和诱位.

结论:

EtpA的C端重复域对于ETEC-bgA相互作用和粘附至关重要.
埃特帕的广泛糖基化为抗体识别提供了独特的表位.
了解这些相互作用和免疫反应对于开发有效的ETEC疫苗至关重要.

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