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Effect of gamma radiation on heat shock protein expression of four foodborne pathogens
Author(s) -
Caillet S.,
Millette M.,
Dussault D.,
Shareck F.,
Lacroix M.
Publication year - 2008
Publication title -
journal of applied microbiology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.889
H-Index - 156
eISSN - 1365-2672
pISSN - 1364-5072
DOI - 10.1111/j.1365-2672.2008.03891.x
Subject(s) - groel , groes , listeria monocytogenes , viable but nonculturable , heat shock protein , microbiology and biotechnology , bacteria , escherichia coli , biology , pathogenic bacteria , heat shock , chaperonin , hsp60 , hsp70 , biochemistry , genetics , gene
Aims: The effects of gamma radiation on three heat shock proteins (Hsps) (GroEL, DnaK and GroES) synthesis in two Gram‐negative ( Escherichia coli and Salmonella serotype Typhimurium) and two Gram‐positive ( Staphylococcus aureus and Listeria monocytogenes ) bacteria were investigated. Methods and Results: The bacterial strains were treated with three radiation doses to induce cell damage, to obtain a viable but nonculturable state, and to cause cell death. Western blot analysis and quantification of Hsps in bacteria were performed immediately after irradiation treatment. In the four foodborne pathogens, GroEL was strongly induced by gamma rays in a dose‐dependent manner, confirming the involvement of this protein in the cellular response to the stress generated by ionizing radiation. In addition, it was found that E. coli exposed to gamma radiation showed a significantly induction of DnaK and GroES proteins when compared with nonirradiated bacteria, whereas a GroES slight induction and a DnaK inhibition were observed in Salm. Typhimurium. Conclusions: The gamma rays influence the synthesis of Hsps in foodborne pathogen in a way that critically depends on the radiation dose. Significance and Impact of the Study: The study of stress response to several radiation doses was undertaken to elucidate how bacteria can survive in harsh conditions and cope with gamma radiation used to control foodborne pathogens and to characterize their adaptative response to this treatment.