The role of Escherichia coli type III secretion system 2 chaperone protein ygeG in pathogenesis of avian pathogenic Escherichia coli
文献类型： 外文期刊
作者： Yin, Lei 1 ; Li, Qianwen 2 ; Wang, Zeping 1 ; Tu, Jian 2 ; Shao, Ying 2 ; Song, Xiangjun 2 ; Pan, Xiaocheng 1 ; Qi, Kezon 1 ;
作者机构： 1.Anhui Acad Agr Sci, Inst Anim Husb & Vet Sci, Livestock & Poultry Epidem Dis Res Ctr Anhui Prov, Hefei 230031, Anhui, Peoples R China
2.Anhui Agr Univ, Coll Anim Sci & Technol, Anhui Prov Key Lab Vet Pathobiol & Dis Control, Hefei 230036, Peoples R China
关键词： Avian pathogenic Escherichia coli; ETT2; Chaperone protein; ygeG; Pathogenesis; Virulence
期刊名称：RESEARCH IN VETERINARY SCIENCE （ 影响因子：2.534； 五年影响因子：2.382 ）
ISSN： 0034-5288
年卷期： 2021 年 140 卷
页码：
收录情况： SCI
摘要： The Escherichia coli type III secretion system 2 (ETT2) is present in most E. coli strains, carries a 29.9-kb ETT2 pathogenicity island (PAI) and is involved in the virulence of avian pathogenic Escherichia coli (APEC). A chaperone protein is essential for the bacterial secretion system, but the function of the ETT2 chaperone protein has not been determined. This study showed that ygeG had sequence homology with the identified bacterial chaperone protein and it possessed tetratri-copeptide repeats (TPR) containing protein. To investigate the role of ygeG in the ETT2 of APEC, ygeG mutant and complemented strains were constructed and characterized. Inactivation of ygeG had no effect on APEC growth, but significantly promoted biofilm formation, and the adherence to and invasion of DF-1 cells, especially the survival abilities in specific-pathogen-free (SPF) chicken sera serum. Analysis of the role of ygeG in chicken infection models revealed that the deletion of ygeG increased bacterial virulence. RNA Sequencing (RNA-Seq) analyses comparing the APEC wild type and the ygeG mutant indicated that multiple genes encoding biofilm formation, outer membrane proteins, fimbrial genes and virulence effector protein genes were regulated by ygeG. These results revealed the role of ygeG as a chaperone protein that affected the virulence and pathogenicity of APEC.
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