Role of sigma B factor in the alkaline tolerance response of Listeria monocytogenes 10403S and cross-protection against subsequent ethanol and osmotic stress

Efstathios S. Giotis, Mudcharee Julotok, Brian J. Wilkinson, Ian S. Blair, D.A. McDowell

    Research output: Contribution to journalArticle

    19 Citations (Scopus)

    Abstract

    Many of the considerable abilities of Listeria monocytogenes to persist and grow in a wide range of adverse environmental conditions are thought to be at least partly under the control of the alternative sigma factor (sigma(B)), encoded by the sigB gene. However, little is known about the role of this master regulon in the impressive ability of Listeria to persist and grow under conditions of alkaline pH. In this study, Northern blot analysis of parent Listeria mRNA revealed that alkali adaptation (pH 9.5 for 1 h) significantly increased the expression of sigB-derived mRNA. The study included a comparison of the relative survival of mid-exponential populations of adapted and nonadapted parent type (sigma(B) expressing) and mutant (not (TB expressing, Delta sigB) Listeria strains during subsequent alkaline (pH 12.0), osmotic (25% NaCl, wt/vol), or ethanol (16.5%) stress. Alkali-adapted parent strains were more resistant to pH 12.0 than were adapted Delta sigB type strains, but both alkali-adapted parent and Delta sigB strains were more resistant to pH 12.0 than were nonadapted strains. Alkali-adapted parent strains were more resistant to osmotic stress than were adapted Delta sigB type strains. No significant differences in viability were observed between alkali-adapted parent and Delta sigB strains after ethanol stress, suggesting that cross-protection against osmotic stress is mediated by sigma(B) whereas cross-protection against ethanol is sigma(B) independent. Overall, alkali-induced cross-protection against osmotic and ethanol challenges may have serious implications for food safety and human health because such stress conditions are routinely used as part of food preservation and surface cleaning processes.
    LanguageEnglish
    Pages1481-1485
    JournalJournal of Food Protection
    Volume71
    Issue number7
    Publication statusPublished - Jul 2008

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    osmotic stress
    Listeria monocytogenes
    ethanol
    alkalis
    Listeria
    food surfaces
    sigma factors
    regulon
    Northern blotting
    cleaning
    food preservation
    food safety
    human health
    viability
    mutants
    environmental factors

    Cite this

    Giotis, Efstathios S. ; Julotok, Mudcharee ; Wilkinson, Brian J. ; Blair, Ian S. ; McDowell, D.A. / Role of sigma B factor in the alkaline tolerance response of Listeria monocytogenes 10403S and cross-protection against subsequent ethanol and osmotic stress. In: Journal of Food Protection. 2008 ; Vol. 71, No. 7. pp. 1481-1485.
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    title = "Role of sigma B factor in the alkaline tolerance response of Listeria monocytogenes 10403S and cross-protection against subsequent ethanol and osmotic stress",
    abstract = "Many of the considerable abilities of Listeria monocytogenes to persist and grow in a wide range of adverse environmental conditions are thought to be at least partly under the control of the alternative sigma factor (sigma(B)), encoded by the sigB gene. However, little is known about the role of this master regulon in the impressive ability of Listeria to persist and grow under conditions of alkaline pH. In this study, Northern blot analysis of parent Listeria mRNA revealed that alkali adaptation (pH 9.5 for 1 h) significantly increased the expression of sigB-derived mRNA. The study included a comparison of the relative survival of mid-exponential populations of adapted and nonadapted parent type (sigma(B) expressing) and mutant (not (TB expressing, Delta sigB) Listeria strains during subsequent alkaline (pH 12.0), osmotic (25{\%} NaCl, wt/vol), or ethanol (16.5{\%}) stress. Alkali-adapted parent strains were more resistant to pH 12.0 than were adapted Delta sigB type strains, but both alkali-adapted parent and Delta sigB strains were more resistant to pH 12.0 than were nonadapted strains. Alkali-adapted parent strains were more resistant to osmotic stress than were adapted Delta sigB type strains. No significant differences in viability were observed between alkali-adapted parent and Delta sigB strains after ethanol stress, suggesting that cross-protection against osmotic stress is mediated by sigma(B) whereas cross-protection against ethanol is sigma(B) independent. Overall, alkali-induced cross-protection against osmotic and ethanol challenges may have serious implications for food safety and human health because such stress conditions are routinely used as part of food preservation and surface cleaning processes.",
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    Role of sigma B factor in the alkaline tolerance response of Listeria monocytogenes 10403S and cross-protection against subsequent ethanol and osmotic stress. / Giotis, Efstathios S.; Julotok, Mudcharee; Wilkinson, Brian J.; Blair, Ian S.; McDowell, D.A.

    In: Journal of Food Protection, Vol. 71, No. 7, 07.2008, p. 1481-1485.

    Research output: Contribution to journalArticle

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    AU - Giotis, Efstathios S.

    AU - Julotok, Mudcharee

    AU - Wilkinson, Brian J.

    AU - Blair, Ian S.

    AU - McDowell, D.A.

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    N2 - Many of the considerable abilities of Listeria monocytogenes to persist and grow in a wide range of adverse environmental conditions are thought to be at least partly under the control of the alternative sigma factor (sigma(B)), encoded by the sigB gene. However, little is known about the role of this master regulon in the impressive ability of Listeria to persist and grow under conditions of alkaline pH. In this study, Northern blot analysis of parent Listeria mRNA revealed that alkali adaptation (pH 9.5 for 1 h) significantly increased the expression of sigB-derived mRNA. The study included a comparison of the relative survival of mid-exponential populations of adapted and nonadapted parent type (sigma(B) expressing) and mutant (not (TB expressing, Delta sigB) Listeria strains during subsequent alkaline (pH 12.0), osmotic (25% NaCl, wt/vol), or ethanol (16.5%) stress. Alkali-adapted parent strains were more resistant to pH 12.0 than were adapted Delta sigB type strains, but both alkali-adapted parent and Delta sigB strains were more resistant to pH 12.0 than were nonadapted strains. Alkali-adapted parent strains were more resistant to osmotic stress than were adapted Delta sigB type strains. No significant differences in viability were observed between alkali-adapted parent and Delta sigB strains after ethanol stress, suggesting that cross-protection against osmotic stress is mediated by sigma(B) whereas cross-protection against ethanol is sigma(B) independent. Overall, alkali-induced cross-protection against osmotic and ethanol challenges may have serious implications for food safety and human health because such stress conditions are routinely used as part of food preservation and surface cleaning processes.

    AB - Many of the considerable abilities of Listeria monocytogenes to persist and grow in a wide range of adverse environmental conditions are thought to be at least partly under the control of the alternative sigma factor (sigma(B)), encoded by the sigB gene. However, little is known about the role of this master regulon in the impressive ability of Listeria to persist and grow under conditions of alkaline pH. In this study, Northern blot analysis of parent Listeria mRNA revealed that alkali adaptation (pH 9.5 for 1 h) significantly increased the expression of sigB-derived mRNA. The study included a comparison of the relative survival of mid-exponential populations of adapted and nonadapted parent type (sigma(B) expressing) and mutant (not (TB expressing, Delta sigB) Listeria strains during subsequent alkaline (pH 12.0), osmotic (25% NaCl, wt/vol), or ethanol (16.5%) stress. Alkali-adapted parent strains were more resistant to pH 12.0 than were adapted Delta sigB type strains, but both alkali-adapted parent and Delta sigB strains were more resistant to pH 12.0 than were nonadapted strains. Alkali-adapted parent strains were more resistant to osmotic stress than were adapted Delta sigB type strains. No significant differences in viability were observed between alkali-adapted parent and Delta sigB strains after ethanol stress, suggesting that cross-protection against osmotic stress is mediated by sigma(B) whereas cross-protection against ethanol is sigma(B) independent. Overall, alkali-induced cross-protection against osmotic and ethanol challenges may have serious implications for food safety and human health because such stress conditions are routinely used as part of food preservation and surface cleaning processes.

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