Insertional mutagenesis of Listeria monocytogenes 568 reveals genes that contribute to enhanced thermotolerance

Timothy C. Ells, R.A. Speers, Lisbeth Truelstrup Hansen

    Research output: Contribution to journalArticle

    Abstract

    The objectives of this study were to identify molecular mechanisms of thermotolerance using transposon mutants of Listeria monocytogenes 568, serotype 1/2a, and to compare their thermal death kinetics at 52, 56 and 60 degrees C. Sixteen Tn917 transposon mutants with enhanced heat resistance were acquired from a library of 4300 mutants following a multi-step screening process. Genetic regions with Tn917 insertions encompassed a broad range of functionalities including; transport, metabolism, replication and repair, general stress, and structural properties. Modeling of the heat inactivation data using the Geeraerd et al. and Whiting (Fermi) models showed that the mutants' enhanced thermal resistance was manifested mostly through a significant (p <= 0.05) extension of the lag period on the thermal death curve. This new knowledge impacts our understanding of molecular mechanisms affecting the kinetics of thermally induced cell death and enables the development of safer thermal processes. (C) 2009 Elsevier B.V. All rights reserved.

    Original languageEnglish
    Pages (from-to)1-9
    Number of pages9
    JournalInternational Journal of Food Microbiology
    Volume136
    Issue number1
    DOIs
    Publication statusPublished - 30 Nov 2009

    Cite this

    Ells, Timothy C. ; Speers, R.A. ; Hansen, Lisbeth Truelstrup. / Insertional mutagenesis of Listeria monocytogenes 568 reveals genes that contribute to enhanced thermotolerance. In: International Journal of Food Microbiology. 2009 ; Vol. 136, No. 1. pp. 1-9.
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    abstract = "The objectives of this study were to identify molecular mechanisms of thermotolerance using transposon mutants of Listeria monocytogenes 568, serotype 1/2a, and to compare their thermal death kinetics at 52, 56 and 60 degrees C. Sixteen Tn917 transposon mutants with enhanced heat resistance were acquired from a library of 4300 mutants following a multi-step screening process. Genetic regions with Tn917 insertions encompassed a broad range of functionalities including; transport, metabolism, replication and repair, general stress, and structural properties. Modeling of the heat inactivation data using the Geeraerd et al. and Whiting (Fermi) models showed that the mutants' enhanced thermal resistance was manifested mostly through a significant (p <= 0.05) extension of the lag period on the thermal death curve. This new knowledge impacts our understanding of molecular mechanisms affecting the kinetics of thermally induced cell death and enables the development of safer thermal processes. (C) 2009 Elsevier B.V. All rights reserved.",
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    Insertional mutagenesis of Listeria monocytogenes 568 reveals genes that contribute to enhanced thermotolerance. / Ells, Timothy C.; Speers, R.A.; Hansen, Lisbeth Truelstrup.

    In: International Journal of Food Microbiology, Vol. 136, No. 1, 30.11.2009, p. 1-9.

    Research output: Contribution to journalArticle

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    AB - The objectives of this study were to identify molecular mechanisms of thermotolerance using transposon mutants of Listeria monocytogenes 568, serotype 1/2a, and to compare their thermal death kinetics at 52, 56 and 60 degrees C. Sixteen Tn917 transposon mutants with enhanced heat resistance were acquired from a library of 4300 mutants following a multi-step screening process. Genetic regions with Tn917 insertions encompassed a broad range of functionalities including; transport, metabolism, replication and repair, general stress, and structural properties. Modeling of the heat inactivation data using the Geeraerd et al. and Whiting (Fermi) models showed that the mutants' enhanced thermal resistance was manifested mostly through a significant (p <= 0.05) extension of the lag period on the thermal death curve. This new knowledge impacts our understanding of molecular mechanisms affecting the kinetics of thermally induced cell death and enables the development of safer thermal processes. (C) 2009 Elsevier B.V. All rights reserved.

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