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• W1958657858 abstract "A putative PEST sequence was recently identified close to the N-terminus of listeriolysin O (LLO), a major virulence factor secreted by the pathogenic Listeria monocytogenes. The deletion of this motif did not affect the secretion and haemolytic activity of LLO, but abolished bacterial virulence. Here, we first tested whether the replacement of the PEST motif of LLO by two different sequences, with either a very high or no PEST score, would affect phagosomal escape, protein stability and, ultimately, the virulence of L. monocytogenes. Then, we constructed LLO mutants with an intact PEST sequence but carrying mutations on either side, or on both sides, of the PEST motif. The properties of these mutants prompted us to construct three LLO mutants carrying single amino acid substitutions in the distal portion of the PEST region (P49A, K50A and P52A; preprotein numbering). Our data demonstrate that the susceptibility of LLO to intracellular proteolytic degradation is not related to the presence of a high PEST score sequence and that the insertion of two residues immediately downstream of the intact PEST sequence is sufficient to impair phagosomal escape and abolish bacterial virulence. Furthermore, we show that single amino acid substitutions in the distal portion of the PEST motif are sufficient to attenuate bacterial ­virulence significantly, unravelling the critical role of this region of LLO in the pathogenesis of L. ­monocytogenes." @default.
• W1958657858 created "2016-06-24" @default.
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• W1958657858 date "2002-10-01" @default.
• W1958657858 modified "2023-10-10" @default.
• W1958657858 title "Critical role of the N-terminal residues of listeriolysin O in phagosomal escape and virulence of<i>Listeria monocytogenes</i>" @default.
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• W1958657858 doi "https://doi.org/10.1046/j.1365-2958.2002.03176.x" @default.
• W1958657858 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/12406215" @default.
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