ISSN:
1432-072X
Keywords:
Key wordsEnterococcus faecalis
;
NaCl
;
Sucrose
;
Osmoadaptation
;
Osmotic shock
;
Cross-protection
Source:
Springer Online Journal Archives 1860-2000
Topics:
Biology
Notes:
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.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1007/s002030050333
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