1
|
Leclerc JM, Quevillon EL, Houde Y, Paranjape K, Dozois CM, Daigle F. Regulation and production of Tcf, a cable-like fimbriae from Salmonella enterica serovar Typhi. MICROBIOLOGY-SGM 2016; 162:777-788. [PMID: 26944792 DOI: 10.1099/mic.0.000270] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
Abstract
tcf (Typhi colonization factor) is one of the 12 putative chaperone/usher fimbrial clusters present in the Salmonella enterica serovar Typhi genome. We investigated the production, expression and regulation of tcf as well as its role during interaction with human cells. The tcf gene cluster was cloned and induced in Escherichia coli and S. Typhi, and the production of intertwined fibres similar to the Cbl (cable) pili of Burkholderia cepacia was observed on the bacterial surface by electron microscopy. In S. Typhi, tcf was expressed more after growth in M63 minimal medium than in standard Luria-Bertani medium. Analysis of the promoter region identified putative binding sites for the global regulators RcsB, ArgR and Fur. The expression of tcf was measured in isogenic strains lacking these global regulators. Under the conditions tested, the results showed that tcf expression was higher in the fur mutant and was regulated by iron concentration. Fur may regulate these fimbriae indirectly via the small RNAs RyhB1 and RyhB2. An isogenic mutant harbouring a deletion of the tcf cluster did not demonstrate any defect in adhesion or invasion of human epithelial cells, or in phagocytosis or survival in macrophages, when compared to the WT serovar Typhi strain. However, the tcf cluster contributed to adherence to human epithelial cells when introduced into E. coli. Thus, tcf genes encode functional fimbriae that can act as an adhesin and may contribute to colonization during typhoid fever.
Collapse
Affiliation(s)
- Jean-Mathieu Leclerc
- Department of Microbiology, Infectiology and Immunology, Université de Montréal,CP 6128 Succursale Centre-Ville, Montreal, Quebec H3C 3J7,Canada
| | - Eve-Lyne Quevillon
- Department of Microbiology, Infectiology and Immunology, Université de Montréal,CP 6128 Succursale Centre-Ville, Montreal, Quebec H3C 3J7,Canada
| | - Yoan Houde
- Department of Microbiology, Infectiology and Immunology, Université de Montréal,CP 6128 Succursale Centre-Ville, Montreal, Quebec H3C 3J7,Canada
| | - Kiran Paranjape
- Department of Microbiology, Infectiology and Immunology, Université de Montréal,CP 6128 Succursale Centre-Ville, Montreal, Quebec H3C 3J7,Canada
| | - Charles M Dozois
- INRS-Institut Armand-Frappier,531 boulevard des Prairies, Laval, Québec H7V 1B7,Canada
| | - France Daigle
- Department of Microbiology, Infectiology and Immunology, Université de Montréal,CP 6128 Succursale Centre-Ville, Montreal, Quebec H3C 3J7,Canada
| |
Collapse
|
2
|
Yang Y, Kadim MI, Khoo WJ, Zheng Q, Setyawati MI, Shin YJ, Lee SC, Yuk HG. Membrane lipid composition and stress/virulence related gene expression of Salmonella Enteritidis cells adapted to lactic acid and trisodium phosphate and their resistance to lethal heat and acid stress. Int J Food Microbiol 2014; 191:24-31. [DOI: 10.1016/j.ijfoodmicro.2014.08.034] [Citation(s) in RCA: 41] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/29/2014] [Revised: 08/23/2014] [Accepted: 08/26/2014] [Indexed: 01/20/2023]
|
3
|
Scientific Opinion on the public health risks of table eggs due to deterioration and development of pathogens. EFSA J 2014. [DOI: 10.2903/j.efsa.2014.3782] [Citation(s) in RCA: 32] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/15/2023] Open
|
4
|
Growth temperature alters Salmonella Enteritidis heat/acid resistance, membrane lipid composition and stress/virulence related gene expression. Int J Food Microbiol 2014; 172:102-9. [DOI: 10.1016/j.ijfoodmicro.2013.12.006] [Citation(s) in RCA: 73] [Impact Index Per Article: 7.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/26/2013] [Revised: 11/20/2013] [Accepted: 12/04/2013] [Indexed: 11/22/2022]
|
5
|
Abstract
Salmonella Typhimurium has been reported to contaminate egg production across the world, but where Salmonella Enteritidis is endemic it is this latter serovar that dominates egg-borne salmonellosis. However, Salmonella Typhimurium is a major food-borne pathogen so it is important to understand how it can impact the microbiological safety of eggs and what serovar-specific control strategies may be appropriate in the future as control over Salmonella Enteritidis continues to improve. To that end, the present review examines the published literature on Salmonella Typhimurium in laying hens and eggs, with particular reference to comparative studies examining different serovars. Experimentally Salmonella Enteritidis is more often isolated from egg contents and seems to adhere better to reproductive tract mucosa, whilst Salmonella Typhimurium appears to provoke a more intense tissue pathology and immune response, and flock infections are more transient. However, it is observed in many cases that the present body of evidence does not identify clear differences between specific behaviours of the serovars Typhimurium and Enteritidis, whether in laying hens, in their eggs, or in the laying environment. It is concluded that further long-term experimental and natural infection studies are needed in order to generate a clearer picture.
Collapse
Affiliation(s)
- A D Wales
- Department of Bacteriology, Animal Health and Veterinary Laboratories Agency, Woodham Lane, New Haw, Addlestone, Surrey, KT15 3NB, UK
| | | |
Collapse
|
6
|
Scientific Opinion on a quantitative estimation of the public health impact of setting a new target for the reduction of Salmonella in laying hens. EFSA J 2010. [DOI: 10.2903/j.efsa.2010.1546] [Citation(s) in RCA: 32] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022] Open
|