The siderophore-interacting protein is involved in iron acquisition and virulence of Riemerella anatipestifer strain CH3

文献类型： 外文期刊

第一作者： Tu, Jing

作者： Tu, Jing;Lu, Fengying;Miao, Shuang;Ni, Xintao;Jiang, Pan;Yu, Hui;Xing, Linlin;Yu, Shengqing;Ding, Chan;Hu, Qinghai

作者机构：

关键词： Riemerella anatipestifer;Siderophore-interacting protein (SIP);Iron acquisition;Virulence;Deletion mutant

期刊名称：VETERINARY MICROBIOLOGY （ 影响因子：3.293； 五年影响因子：3.599 ）

ISSN：

年卷期：

页码：

收录情况： SCI

摘要： Riemerella anatipestifer causes epizootic infectious disease in poultry and serious economic losses especially to the duck industry. However, little is known regarding the molecular basis of its pathogenesis. The ability to acquire iron under low-iron conditions is related to the virulence of a variety of bacterial pathogens. In this study, a sip (Riean_1281) deletion mutant CH3 Delta sip was constructed and characterized for iron-limited growth, biofilm formation, and pathogenicity to ducklings. Results showed that siderophore-interacting protein (SIP) was involved in iron utilization and the sip deletion significantly reduced biofilm formation and adherence to and invasion of Vero cells. In addition, the sip gene was absent in 1 of 24 (4.17%) virulent strains and 2 of 3 (66.7%) avirulent strains of R. anatipestifer, and the sip gene from six R. anatipestifer strains, which belong to serotypes 1, 2, and 10, respectively, shared 100% amino acid identities to those of R. anatipestifer strains DSM15868 and RA-GD. These results suggested that siderophore-mediated iron acquisition may be an important iron-uptake pathway in R. anatipestifer. Animal experiments indicated that the median lethal dose of the CH3 Delta sip mutant in ducklings was about 35-fold higher than that of the wild-type CH3 strain. Thus, our results demonstrated that R. anatipestifer SIP was involved in iron acquisition and necessary for its optimal virulence

分类号： S8

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