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- W4321481990 abstract "Abstract The foodborne pathogen Listeria monocytogenes can grow in a wide range of environmental conditions. For the study of the physiology of this organism, several chemically defined media have been developed over the past decades. Here, we examined the ability of L. monocytogenes wildtype strains EGD-e and 10403S to grow under salt and pH stress in Listeria synthetic medium (LSM). Furthermore, we determined that a wide range of carbon sources could support growth of both wildtype strains in LSM. However, for hexose phosphate sugars such as glucose-1-phosphate, both L. monocytogenes strains need to be pre-grown under conditions, where the major virulence regulator PrfA is active. In addition, growth of both L. monocytogenes strains was observed when LSM was supplemented with the amino acid sugar N -acetylmannosamine (Man N Ac). We were able to show that some of the proteins encoded in the operon lmo2795 - nanE , such as the Man N Ac-6-phosphate epimerase NanE, are required for growth in presence of Man N Ac. The first gene of the operon, lmo2795, encodes a transcriptional regulator of the RpiR family. Using electrophoretic mobility shift assays and quantitative real time PCR analysis, we were able to show that Lmo2795 binds to the promoter region of the operon lmo2795 - nanE and activates its expression. Originality-Significance Statement Current knowledge of growth and survival of the human pathogen Listeria monocytogenes under diverse stress conditions is mostly generated in complex medium, a condition that is rarely found in the environment or host of the pathogen. Our work contributes to the characterization of the physiology of L. monocytogenes grown under nutrient limiting conditions and its growth requirements with regards to metabolizable carbon sources." @default.
- W4321481990 created "2023-02-23" @default.
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- W4321481990 date "2023-02-22" @default.
- W4321481990 modified "2023-09-30" @default.
- W4321481990 title "Characterization of the growth behavior of<i>Listeria monocytogenes</i>in<i>Listeria</i>synthetic media" @default.
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- W4321481990 doi "https://doi.org/10.1101/2023.02.21.529469" @default.
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