PMID:16597971
| Citation |
Malone, AS, Chung, YK and Yousef, AE (2006) Genes of Escherichia coli O157:H7 that are involved in high-pressure resistance. Appl. Environ. Microbiol. 72:2661-71 |
|---|---|
| Abstract |
Seventeen Escherichia coli O157:H7 strains were treated with ultrahigh pressure at 500 MPa and 23 +/- 2 degrees C for 1 min. This treatment inactivated 0.6 to 3.4 log CFU/ml, depending on the strain. The diversity of these strains was confirmed by pulsed-field gel electrophoresis (PFGE) analysis, and there was no apparent association between PFGE banding patterns and pressure resistance. The pressure-resistant strain E. coli O157:H7 EC-88 (0.6-log decrease) and the pressure-sensitive strain ATCC 35150 (3.4-log decrease) were treated with a sublethal pressure (100 MPa for 15 min at 23 +/- 2 degrees C) and subjected to DNA microarray analysis using an E. coli K-12 antisense gene chip. High pressure affected the transcription of many genes involved in a variety of intracellular mechanisms of EC-88, including the stress response, the thiol-disulfide redox system, Fe-S cluster assembly, and spontaneous mutation. Twenty-four E. coli isogenic pairs with mutations in the genes regulated by the pressure treatment were treated with lethal pressures at 400 MPa and 23 +/- 2 degrees C for 5 min. The barotolerance of the mutants relative to that of the wild-type strains helped to explain the results obtained by DNA microarray analysis. This study is the first report to demonstrate that the expression of Fe-S cluster assembly proteins and the fumarate nitrate reductase regulator decreases the resistance to pressure, while sigma factor (RpoE), lipoprotein (NlpI), thioredoxin (TrxA), thioredoxin reductase (TrxB), a trehalose synthesis protein (OtsA), and a DNA-binding protein (Dps) promote barotolerance. |
| Links |
PubMed PMC1449011 Online version:10.1128/AEM.72.4.2661-2671.2006 |
| Keywords |
Bacterial Proteins/genetics; Bacterial Proteins/metabolism; Electrophoresis, Gel, Pulsed-Field; Escherichia coli O157/genetics; Escherichia coli O157/metabolism; Escherichia coli O157/physiology; Food Preservation/methods; Gene Expression Profiling; Gene Expression Regulation, Bacterial; Heat-Shock Response; Humans; Hydrostatic Pressure; Oligonucleotide Array Sequence Analysis |
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