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Effect of gamma irradiation on the expressed proteins in the foodborne pathogen Staphylococcus aureus

Trudeau, Karine; Vu, Khanh Dang; Shareck, François et Lacroix, Monique ORCID logoORCID: https://orcid.org/0000-0002-2042-4033 (2012). Effect of gamma irradiation on the expressed proteins in the foodborne pathogen Staphylococcus aureus Radiation Physics and Chemistry , vol. 81 , nº 8. pp. 1181-1184. DOI: 10.1016/j.radphyschem.2012.02.034.

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Résumé


A capillary electrophoresis method with UV detection was developed to analyze protein composition of the foodborne pathogen Staphylococcus aureus. Bacterial samples containing 10(9) CFU/ml, obtained after two cycles of incubations of 24 h, were gamma irradiated at different doses of 1.2, 3.5 and 2.9 kGy to respectively create damage cells, to kill cells and to provoke viable but non cultivable cells (VBNC). It was observed that an irradiation at a sensitive dose of 1.2 kGy caused a significantly increase in the protein with molecular weight (MW) of 17.7 kDa (from 0.61% to 1.2%). This treatment also caused decreases in the expressed proteins with the MWs of 16.3 kDa (from 6.2% to 5.3%) and of 23.4 kDa (from 4.0% to 2.30%). Irradiation at a VBCN dose of 2.9 kGy caused increases in expressed proteins with the MWs of 17.7 kDa (from 0.61% to 3.43%), 18.7 kDa (from 1.04% to 4.30%), 19.5 kDa (from 0.71% to 2.30%), 21.1 kDa (from 1.20% to 3.80%). Moreover, this treatment (2.9 kGy) also caused significantly decreases (P <= 0.05) in the expressed proteins with the MW of 30.7 kDa (from 8.6% to 5.15%), 36.3 kDa (from 3.1% to 2.7%) and 40.5 kDa (from 11.3% to 8.5%). Finally, for the irradiation at a lethal dose of 3.5 kGy, it can be found that the expressed proteins with the MW of 17.7 kDa, 18.7 kDa and 19.5 kDa were increased less than that of expressed proteins at the VCNC dose (2.9 kGy) and these might be the very important proteins which are responsible for the survival of the S. aureus. Further, there were also the decreases in expressed proteins with the MW of 30.7 kDa, 36.3 kDa and 75.1 kDa at this dose of treatment (3.5 kGy) which can be expected that these proteins are seriously affected at high dose of gamma-irradiation treatment.

Type de document: Article
Mots-clés libres: Capillary electrophoresis; Staphylococcus aureus; Protein composition; Gamma irradiation
Centre: Centre INRS-Institut Armand Frappier
Date de dépôt: 09 mars 2024 21:31
Dernière modification: 09 mars 2024 21:31
URI: https://espace.inrs.ca/id/eprint/14097

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