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- W2153311435 abstract "ABSTRACT The observed sensitivity of Listeria monocytogenes to the toxic proline analogue l -azetidine-2-carboxylic acid (AZ) suggested that proline synthesis in Listeria may be regulated by feedback inhibition of γ-glutamyl kinase (GK), the first enzyme of the proline biosynthesis pathway, encoded by the proB gene. Taking advantage of the Epicurian coli mutator strain XL1-Red, we performed random mutagenesis of the recently described proBA operon and generated three independent mutations in the listerial proB homologue, leading to proline overproduction and salt tolerance when expressed in an E. coli (Δ proBA ) background. While each of the mutations (located within a conserved 26-amino-acid region of GK) was shown to confer AZ resistance (AZ r ) on an L. monocytogenes proBA mutant, listerial transformants failed to exhibit the salt-tolerant phenotype observed in E. coli . Since proline accumulation has previously been linked to the virulence potential of a number of pathogenic bacteria, we analyzed the effect of proline overproduction on Listeria pathogenesis. However, our results suggest that as previously described for proline auxotrophy, proline hyperproduction has no apparent impact on the virulence potential of Listeria ." @default.
- W2153311435 created "2016-06-24" @default.
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- W2153311435 date "2001-10-01" @default.
- W2153311435 modified "2023-10-04" @default.
- W2153311435 title "Mutations in the Listerial <i>proB</i> Gene Leading to Proline Overproduction: Effects on Salt Tolerance and Murine Infection" @default.
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- W2153311435 doi "https://doi.org/10.1128/aem.67.10.4560-4565.2001" @default.
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