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Prevalence of Iron Transport Gene on Pathogenicity-Associated Island of Uropathogenic Escherichia coli in E. coli O157:H7 Containing Shiga Toxin Gene

机译:铁转运基因在含有志贺毒素基因的大肠杆菌O157:H7中在致病性大肠埃希氏菌相关岛上的流行

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摘要

Uropathogenc Escherichia coli (UPEC) CFT073 has a pathogenicity-associated island (PAICFT073), which causes pyelonephritis and cystitis. Using PCR method, we found the prrA gene of PAICFT073 in E. coli O157:H7 EDL933. Further detailed PCR screening of 38 open reading frames, the right and left junction sequences of PAICFT073, revealed that it is the prrA-modD-yc73-fepC gene cluster but not the PAICFT073 present in E. coli O157:H7 EDL933. A rapid preliminary analysis suggested that the prrA-modD-yc73-fepC gene cluster of the PAICFT073, is present in 43 strains of E. coli O157:H7 containing Shiga toxin (Stx) gene but absent in 19 strains of E. coli O157:H7 without Stx gene. A strict co-occurrence of the prrA-modD-yc73-fepC gene cluster and Stx genes was observed, regardless of their origin. The prrA-modD-yc73-fepC gene cluster encode proteins probably involved in iron uptake system, which strongly suggests the importance of iron metabolism in the Stx-mediated virulence. In addition, the prrA-modD-yc73-fepC gene cluster may be used as a diagnostic marker to distinguish E. coli O157:H7 strains containing Stx gene from that without Stx gene, and possibly to quickly detect other pathogenic gram-negative bacteria containing the Stx gene.
机译:尿毒症性大肠杆菌(UPEC)CFT073具有致病性相关岛(PAICFT073),可引起肾盂肾炎和膀胱炎。使用PCR方法,我们在大肠杆菌O157:H7 EDL933中发现了PAICFT073的prrA基因。对38个开放阅读框(PAICFT073的左右连接序列)的进一步详细PCR筛选显示,它是prrA-modD-yc73-fepC基因簇,而不是大肠杆菌O157:H7 EDL933中存在的PAICFT073。快速的初步分析表明,PAICFT073的prrA-modD-yc73-fepC基因簇存在于43株含有志贺毒素(Stx)基因的O157:H7大肠杆菌中,但在19株O157大肠杆菌中却不存在:没有Stx基因的H7。不论其来源如何,均观察到prrA-modD-yc73-fepC基因簇和Stx基因严格共存。 prrA-modD-yc73-fepC基因簇编码可能与铁吸收系统有关的蛋白质,这强烈表明铁代谢在Stx介导的毒力中的重要性。此外,prrA-modD-yc73-fepC基因簇可以用作诊断标记,以区分含有Stx基因的大肠杆菌O157:H7菌株和不含Stx基因的大肠杆菌,并可能快速检测出其他含有Stx基因的致病革兰氏阴性细菌Stx基因。

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    Ye, Changyun; Xu, Jianguo;

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  • 年度 2001
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