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Role of Intimin-Tir Interactions and the Tir-Cytoskeleton Coupling Protein in the Colonization of Calves and Lambs by Escherichia coli O157:H7

机译:Intimin-Tir相互作用和Tir-细胞骨架偶联蛋白在大肠杆菌O157:H7对小牛和羔羊定殖中的作用

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Intimin facilitates intestinal colonization by enterohemorrhagic Escherichia coli O157:H7; however, the importance of intimin binding to its translocated receptor (Tir) as opposed to cellular coreceptors is unknown. The intimin-Tir interaction is needed for optimal actin assembly under adherent bacteria in vitro, a process which requires the Tir-cytoskeleton coupling protein (TccP/EspFU) in E. coli O157:H7. Here we report that E.?coli O157:H7 tir mutants are at least as attenuated as isogenic eae mutants in calves and lambs, implying that the role of intimin in the colonization of reservoir hosts can be explained largely by its binding to Tir. Mutation of tccP uncoupled actin assembly from the intimin-Tir-mediated adherence of E. coli O157:H7 in vitro but did not impair intestinal colonization in calves and lambs, implying that pedestal formation may not be necessary for persistence. However, an E. coli O157:H7 tccP mutant induced typical attaching and effacing lesions in a bovine ligated ileal loop model of infection, suggesting that TccP-independent mechanisms of actin assembly may operate in vivo.
机译:内膜蛋白通过肠出血性大肠杆菌O157:H7促进肠道定植;然而,与细胞共受体相反,内膜蛋白与其转位受体(Tir)结合的重要性尚不清楚。在贴壁细菌的体外最佳肌动蛋白组装需要intimin-Tir相互作用,这一过程需要 E中的Tir-细胞骨架偶联蛋白(TccP / EspF U )。大肠杆菌O157:H7。在这里我们报告说,小牛和羔羊中的大肠杆菌 O157:H7 tir 突变体至少与同基因的 eae 突变体衰减程度相同,这表明intimin在储层宿主定殖中的作用主要可以通过与Tir的结合来解释。内膜素-Tir介导的 E的粘附 tccP 肌动蛋白装配的突变。大肠杆菌O157:H7体外,但不损害小牛和羔羊的肠道定植,这表明持久性不一定需要形成基座。但是, E。 O157:H7 tccP 大肠杆菌突变体在牛结扎回肠环感染模型中诱导了典型的附着和脱落损伤,表明肌动蛋白装配的非TccP独立机制可能在体内起作用。

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