| Adhesion of Enteroaggregative E. coli Strains to HEK293 Cells
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Author:
Date:
2018-04-20
[Abstract] Enteroaggregative Escherichia coli (EAEC) is a recognized cause of acute diarrhea among both children and adults worldwide. EAEC strains are characterized by the presence of aggregative adherence fimbriae (AAF), which play a key role in pathogenesis by mediating attachment to the intestinal mucosa and by triggering host inflammatory responses. The aggregative adherence fimbria II (AAF/II) is the most important adherence factor of EAEC prototype strain 042 (EAEC042) to intestinal cells. Multiple receptors for AAF/II on epithelial cells have been identified including the transmembrane signaling mucin Muc1. This protocol describes a method to measure adherence of EAEC strains to HEK293 cells expressing the Muc1 glycoprotein.
[摘要] 肠道集聚性大肠杆菌（EAEC）是全球儿童和成人急性腹泻的公认原因。 EAEC菌株的特征在于存在聚集粘附菌毛（AAF），其通过介导与肠粘膜的附着和通过引发宿主炎症反应而在发病机制中起关键作用。 聚合粘附菌毛II（AAF / II）是EAEC原型菌株042（EAEC042）对肠细胞最重要的粘附因子。 已经鉴定了上皮细胞上AAF / II的多种受体，包括跨膜信号传导粘蛋白Muc1。 该协议描述了测量EAEC菌株对表达Muc1糖蛋白的HEK293细胞的依从性的方法。
【背景】EAEC是世界范围内地方性和流行性腹泻病的重要原因。尽管发展中国家儿童腹泻最常见，但EAEC还与免疫受损成人腹泻，旅行者和工业化国家的食源性疾病有关，例如由志贺毒素（Stx）2a型产生的大致致命爆发2011年在北欧的血清型O104：H4的EAEC菌株（Harrington等人，2006; Rasko等人，2011）。 EAEC发病机制由生物体粘附肠细胞，产生肠毒素和细胞毒素并最终诱导炎症的能力决定（Harrington等，2006）。 EAEC对肠细胞的依从性由AAF菌毛粘附素介导（Czeczulin等人，1997）。迄今为止，已经描述了至少5种AAF菌毛的变体，全部编码在范围为55至65MDa的毒力质粒中（Jonsson等人，2015）。 ...
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| Trimolecular Fluorescence Complementation (TriFC) Assay for Direct Visualization of RNA-Protein Interaction in planta
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Author:
Date:
2017-10-20
[Abstract] RNA-Protein interactions play important roles in various eukaryotic biological processes. Molecular imaging of subcellular localization of RNA/protein complexes in plants is critical for understanding these interactions. However, methods to image RNA-Protein interactions in living plants have not yet been developed until now. Recently, we have developed a trimolecular fluorescence complementation (TriFC) system for in vivo visualization of RNA-Protein interaction by transient expression in tobacco leaves. In this method, we combined conventional bimolecular fluorescence complementation (BiFC) system with MS2 system (phage MS2 coat protein [MCP] and its binding RNA sequence [MS2 sequence]) (Schonberger et al., 2012). Target RNA is tagged with 6xMS2 and MCP and RNA binding ...
[摘要] RNA-蛋白质相互作用在各种真核生物过程中起重要作用。 RNA /蛋白质复合物在植物中亚细胞定位的分子成像对于理解这些相互作用至关重要。然而，到目前为止，尚未开发在活植物中形成RNA-蛋白质相互作用的方法。最近，我们开发了一种三分子荧光互补（TriFC）系统，用于在烟草叶中瞬时表达的RNA-蛋白质相互作用的体内可视化。在这种方法中，我们将传统的双分子荧光互补（BiFC）系统与MS2系统（噬菌体MS2外壳蛋白[MCP]及其结合RNA序列[MS2序列]）（Schonberger等人，2012）相结合， 。目标RNA用6xMS2标记，MCP和RNA结合蛋白与YFP片段融合。编码这种融合RNA和蛋白质的DNA构建体用土壤杆菌悬浮液渗入烟草叶中。通过共焦显微镜观察体内的RNA-蛋白质相互作用
【背景】近来，多种类型的长非编码RNA（lncRNA）已经被鉴定并显示出在转录调节和染色质修饰中起重要作用（St Laurent等人，2015）。到目前为止，lncRNA介导的功能的大多数分子机制与RNA-蛋白质相互作用密切相关（St ...
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