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Defense against lethal treatments and de novo protein synthesis induced by NaCl in Enterococcus faecalis ATCC 19433

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Abstract

Enterococcus faecalis was strongly resistant to high osmotic pressure in complex medium; however, when it was subjected to a moderate osmotic stress [6.5% (w/v) NaCl or 52% (w/v) sucrose] for 2 h, it showed cross-protection against ethanol (22%), detergents stresses [bile salts (0.3%) and SDS (0.017%)], hydrogen peroxide challenge (45 mM), and to a minor extent against lethal temperature (62° C). In response to salt stress [6.5% (w/v) NaCl], E. faecalis induced a large number of stress proteins. In addition, NaCl strongly induced the synthesis of many proteins more than tenfold. Although the acquired thermotolerance was inhibited markedly by chloramphenicol, the other NaCl-induced cross-tolerances seemed not to be correlated with de novo protein synthesis. The relationship between the stress protein synthesis and the induction of different types of cross-protection is discussed.

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Received: 7 September 1995 / Accepted: 29 January 1996

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Flahaut, S., Benachour, A., Giard, JC. et al. Defense against lethal treatments and de novo protein synthesis induced by NaCl in Enterococcus faecalis ATCC 19433. Arch Microbiol 165, 317–324 (1996). https://doi.org/10.1007/s002030050333

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  • DOI: https://doi.org/10.1007/s002030050333

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