AIMS: The aim of this study was to examine the contribution of a five-gene islet (lmo0444 - lmo0448) to the growth of Listeria monocytogenes under suboptimal conditions. METHODS AND RESULTS: Bioinformatics and PCR analyses revealed that a five-gene islet is present in c. half of all L. monocytogenes strains examined (66 in total). A deletion mutant that lacks the entire c. 8·7-kb islet was created in L. monocytogenes strain LO28. This mutant was impaired in growth at low pH and at high salt concentrations and demonstrated a decreased ability to survive and grow in a model food system (frankfurters). Transcriptional analysis revealed that the islet is self-regulated in that the product of lmo0445 regulates the expression of the other four genes. A role of the alternative stress sigma factor SigB in regulating the islet was also uncovered. CONCLUSIONS: The five-gene islet (herein designated as SSI-1; stress survival islet 1) contributes to the growth of L. monocytogenes under suboptimal conditions. SIGNIFICANCE AND IMPACT OF THE STUDY: SSI-1 may contribute to the survival of certain strains of L. monocytogenes in food environments.
AIMS: The aim of this study was to examine the contribution of a five-gene islet (lmo0444 - lmo0448) to the growth of Listeria monocytogenes under suboptimal conditions. METHODS AND RESULTS: Bioinformatics and PCR analyses revealed that a five-gene islet is present in c. half of all L. monocytogenes strains examined (66 in total). A deletion mutant that lacks the entire c. 8·7-kb islet was created in L. monocytogenes strain LO28. This mutant was impaired in growth at low pH and at high salt concentrations and demonstrated a decreased ability to survive and grow in a model food system (frankfurters). Transcriptional analysis revealed that the islet is self-regulated in that the product of lmo0445 regulates the expression of the other four genes. A role of the alternative stress sigma factor SigB in regulating the islet was also uncovered. CONCLUSIONS: The five-gene islet (herein designated as SSI-1; stress survival islet 1) contributes to the growth of L. monocytogenes under suboptimal conditions. SIGNIFICANCE AND IMPACT OF THE STUDY: SSI-1 may contribute to the survival of certain strains of L. monocytogenes in food environments.
Authors: Anne Holch; Kristen Webb; Oksana Lukjancenko; David Ussery; Benjamin M Rosenthal; Lone Gram Journal: Appl Environ Microbiol Date: 2013-02-22 Impact factor: 4.792
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Authors: Tong Chen; Renato H Orsi; Ruixi Chen; Maureen Gunderson; Sherry Roof; Martin Wiedmann; Sara E Childs-Sanford; Kevin J Cummings Journal: Vet Med Sci Date: 2022-02-03