Absence of ZnuABC-mediated zinc uptake affects virulence-associated phenotypes of uropathogenic Escherichia coli CFT073 under Zn(II)-depleted conditions.

Absence of ZnuABC-mediated zinc uptake affects virulence-associated phenotypes of uropathogenic Escherichia coli CFT073 under Zn(II)-depleted conditions.
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DOI:
10.1111/j.1574-6968.2009.01762.x
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发表时间:
2009-11
影响因子:
2.1
通讯作者:
Crowder MW
Crowder MW
中科院分区:
生物学4区
文献类型:
--
作者:
Gunasekera TS;Herre AH;Crowder MW

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为了揭示高亲和力Zn(II)吸收系统在尿路致病性大肠杆菌CFT 073中的作用,我们删除了ZnuB基因,该基因编码ZnuABC转运系统的跨膜组分。znuB的无效突变体在基本培养基上不生长,除非补充过量的Zn(II)(50 μM ZnCl 2)。相比之下,E. coli K-12 ΔznuB细胞株在不添加Zn(II)的基本培养基上生长良好。ΔznuB突变体在静态条件下明显缺乏生物膜的形成,并且还显示出群细胞的迁移前沿显著减少。由于运动性和生物膜的形成对大肠杆菌很重要。coliCFT 073致病性的研究表明,高亲和性的Zn(II)摄取系统可能与该病原体在泌尿道中的致病性有关。
In an effort to uncover the role of the high affinity Zn(II) uptake system in uropathogenic Escherichia coli CFT073, we deleted the znuB gene, which encodes for the transmembrane component of the ZnuABC transporter system. The null mutant for znuB did not grow on minimal medium unless supplemented with excess Zn(II) (50 µM ZnCl2). In contrast, the E. coli K-12 ΔznuB cell line grew well on minimal medium that was not supplemented with Zn(II). The ΔznuB mutant was significantly deficient in formation of biofilm under static conditions and also showed a substantially-reduced migration front of swarm cells. Because motility and biofilm formation are important for E. coli CFT073 pathogenicity, we propose that the high affinity Zn(II) uptake system may contribute to the virulence of this pathogen in the urinary tract.
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