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CesD2 of Enteropathogenic Escherichia coli Is a Second Chaperone for the Type III Secretion Translocator Protein EspD

机译:肠致病性大肠杆菌的CesD2是III型分泌转运蛋白EspD的第二个伴侣。

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Enteropathogenic Escherichia coli (EPEC) and enterohemorrhagic E. coli are extracellular pathogens that employ a type III secretion system to export translocator and effector proteins, proteins which facilitates colonization of the mucosal surface of the intestine via formation of attaching and effacing (A/E) lesions. The genes encoding the proteins for A/E lesion formation are located on a pathogenicity island, termed the locus of enterocyte effacement (LEE), which contains eae encoding intimin as well as the type III secretion system and effector genes. Many type III secreted proteins are stabilized and maintained in a secretion-competent conformation in the bacterial cytosol by specific chaperone proteins. Three type III chaperones have been described thus far within the EPEC LEE region: CesD, for the translocator proteins EspB and EspD; CesT, for the effector proteins Tir and Map; and CesF, for EspF. In this study we report the characterization of CesD2 (previously Orf27), a second LEE-encoded chaperone for EspD. We show specific CesD2-EspD protein interaction which appears to be necessary for proper EspD secretion in vitro and pathogenesis in vivo as demonstrated in the A/E-lesion-forming mouse pathogen Citrobacter rodentium.
机译:肠致病性大肠埃希菌(EPEC)和肠出血性大肠埃希菌。大肠杆菌是一种细胞外病原体,它利用III型分泌系统输出易位蛋白和效应蛋白,这些蛋白通过附着和消融(A / E)病变的形成促进肠道粘膜表面的定殖。编码A / E病变形成蛋白的基因位于一个致病岛上,称为肠上皮细胞侵染(LEE)的基因座,其中包含编码内膜素的 eae 以及III型分泌系统和效应子基因。许多III型分泌蛋白可以通过特定的伴侣蛋白稳定并维持在细菌细胞溶胶中的分泌型构象中。迄今为止,已经在EPEC LEE区域内描述了三种III型分子伴侣:用于转运蛋白EspB和EspD的CesD;用于转位蛋白EspB和EspD的蛋白。 CesT,用于效应蛋白Tir和Map;和CesF,用于EspF。在这项研究中,我们报告了EsD的第二个LEE编码伴侣分子CesD2(以前是Orf27)的表征。我们展示了特定的CesD2-EspD蛋白相互作用,这似乎是在体外形成适当的EspD和在体内发病机理所必需的,正如在形成A / E病变的小鼠病原体 Centrobacter rodentium 中所证明的那样。

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