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Heterogeneous expression of Pil3 pilus is critical for Streptococcus gallolyticus translocation across polarized colonic epithelial monolayers

Abstract : Streptococcus gallolyticus is an opportunistic pathogen responsible for septicemia and endocarditis. We report that S. gallolyticus UCN34 adheres and crosses epithelial monolayers in a Pil3 dependent manner. Confocal images revealed a paracellular passage. Both the Δpil3 mutant and the Pil3+ overexpressing variant were unable to cross Caco-2 and T84 barriers. However, combining live Δpil3 mutant with fixed Pil3+ variant in a 9:1 ratio allowed efficient translocation of the Δpil3 mutant. These results demonstrate that heterogeneous expression of Pil3 plays a key role for UCN34 translocation across the intestinal barrier. Through this skilful strategy, S. gallolyticus probably evade host immune responses.
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https://hal-pasteur.archives-ouvertes.fr/pasteur-03262258
Contributor : Shaynoor Dramsi <>
Submitted on : Wednesday, June 16, 2021 - 1:51:15 PM
Last modification on : Friday, June 18, 2021 - 3:42:54 AM

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Mariana Martins, Laurence Du Merle, Patrick Trieu-Cuot, Shaynoor Dramsi. Heterogeneous expression of Pil3 pilus is critical for Streptococcus gallolyticus translocation across polarized colonic epithelial monolayers. Microbes and Infection, Elsevier, 2020, 22 (1), pp.55-59. ⟨10.1016/j.micinf.2019.12.001⟩. ⟨pasteur-03262258⟩

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