Zinc uptake system ZnuACB is essential for maintaining pathogenic phenotype of F4ac(+) enterotoxigenic E. coli (ETEC) under a zinc restricted environment.

Zinc uptake system ZnuACB is essential for maintaining pathogenic phenotype of F4ac(+) enterotoxigenic E. coli (ETEC) under a zinc restricted environment.
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锌摄取系统 ZnuACB 对于在锌限制环境下维持 F4ac 产肠毒素大肠杆菌 (ETEC) 的致病表型至关重要

DOI:
10.1186/s13567-020-00854-1
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发表时间:
2020-10-07
影响因子:
4.4
通讯作者:
Zhu G
Zhu G
中科院分区:
农林科学2区
文献类型:
--
作者:
Quan G;Xia P;Lian S;Wu Y;Zhu G

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锌是生物体中仅次于铁的第二种微量元素。鉴于其至关重要的作用,哺乳动物宿主限制了锌离子(Zn 2+)对细菌病原体的生物利用度。作为对策,病原体利用高亲和力Zn 2+转运蛋白,如ZnuACB与宿主竞争锌。细菌必须维持锌稳态,从而维持其生理和致病。为了揭示F4+肠毒素E.大肠杆菌(ETEC)C83902中,我们分析了当应用不同锌处理(限制或丰度)时细菌样品的两个RNA-seq数据集。考虑到数据显示高亲和力锌吸收系统ZnuACB是ETEC C83902抵抗锌缺乏的主要转运蛋白,我们删除了znuACB基因以研究它们在ETEC C83902中的作用。znuACB基因的缺失导致细菌在体外的生长扰动和生物膜形成和粘附能力的急剧下降。综合这些数据,本研究表明,ZnuACB系统是ETEC C83902获得锌所必需的,这也高度有助于ETEC的致病性。
Zinc is the second trace element of living organisms after iron. Given its crucial importance, mammalian hosts restrict the bioavailability of Zinc ions (Zn2+) to bacterial pathogens. As a countermeasure, pathogens utilize high affinity Zn2+ transporters, such as ZnuACB to compete with the host for zinc. It is essential for bacteria to maintain zinc homeostasis and thus maintain their physiology and pathogenesis. In an attempt to uncover the zinc transporter in F4+ enterotoxigenic E. coli (ETEC) C83902, we analyzed two RNA-seq data sets of bacteria samples when different zinc treatments (restriction or abundance) were applied. Considering data revealing that the high affinity zinc uptake system ZnuACB acts as the main transporter in ETEC C83902 to resist zinc deficiency, we deleted znuACB genes to study the role of them in ETEC C83902. The deletion of znuACB genes results in growth perturbation and a sharp decrease in the ability of biofilm formation and adhesion of bacteria in vitro. Taking the data together, this study demonstrates that the ZnuACB system is required for ETEC C83902 to acquire zinc, which highly contributes to ETEC pathogenicity as well.
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