The Salmonella enterica serovar Typhimurium virulence factor STM3169 is a hexuronic acid binding protein component of a TRAP transporter.

The Salmonella enterica serovar Typhimurium virulence factor STM3169 is a hexuronic acid binding protein component of a TRAP transporter.
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DOI:
10.1099/mic.0.000967
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发表时间:
2020-10
期刊:
Microbiology (Reading, England)
影响因子:
--
通讯作者:
Thomas GH
Thomas GH
中科院分区:
其他
文献类型:
--
作者:
Herman R;Bennett-Ness C;Maqbool A;Afzal A;Leech A;Thomas GH

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细胞内病原体鼠伤寒沙门氏菌是世界各地食源性疾病的主要原因,众所周知,依靠一系列毒力因素来定植人类宿主并引起疾病。编码一个这样一个因素的基因STM3169被确定为巨噬细胞进入时被上调,其破坏会降低巨噬细胞中的存活率。在这项研究中,我们表征了STM3169蛋白,该蛋白形成了未表征的三方非依赖性周期蛋白(TRAP)转运蛋白的底物结合蛋白(SBP)。在相关细菌中编码该系统的基因的基因组上下文分析表明糖酸的运输功能。我们证明纯化的STM3169结合具有高亲和力和特异性的D-葡萄糖酸。 Typhimurium lt2可以将这种糖酸用作唯一的碳源,并且基因组中存在可能的分解代谢途径的基因。由于该基因以前与巨噬细胞的生存有关,因此在这种环境下,它表明了D-葡萄糖酸盐作为鼠伤伤小链球菌的重要碳源的作用。
The intracellular pathogen S. Typhimurium is a leading cause of foodborne illness across the world and is known to rely on a range of virulence factors to colonize the human host and cause disease. The gene coding for one such factor, stm3169, was determined to be upregulated upon macrophage entry and its disruption reduces survival in the macrophage. In this study we characterize the STM3169 protein, which forms the substrate binding protein (SBP) of an uncharacterized tripartite ATP-independent periplasmic (TRAP) transporter. Genome context analysis of the genes encoding this system in related bacteria suggests a function in sugar acid transport. We demonstrate that purified STM3169 binds d-glucuronic acid with high affinity and specificity. S. Typhimurium LT2 can use this sugar acid as a sole carbon source and the genes for a probable catabolic pathway are present in the genome. As this gene was previously implicated in macrophage survival, it suggests a role for d-glucuronate as an important carbon source for S. Typhimurium in this environment.
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