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Pré-Publication, Document De Travail Année : 2022

Substrate stiffness impacts early biofilm formation by modulating Pseudomonas aeruginosa twitching motility

Sofia Gomez Ho
  • Fonction : Auteur
Karin John
  • Fonction : Auteur
Sigolène Lecuyer

Résumé

Surface-associated lifestyles dominate in the bacterial world. Large multicellular assemblies, called biofilms, are essential to the survival of bacteria in harsh environments, and are closely linked to antibiotic resistance in pathogenic strains. Biofilms stem from the surface colonization of a wide variety of substrates encountered by bacteria, from living tissues to inert materials. Here, we demonstrate experimentally that the promiscuous opportunistic pathogen Pseudomonas aeruginosa explores substrates differently based on their rigidity, leading to striking variations in biofilm structure, exopolysaccharides (EPS) distribution, strain mixing during co-colonization and phenotypic expression. Using simple kinetic models, we show that these phenotypes arise through a mechanical interaction between the elasticity of the substrate and the type IV pilus (T4P) machinery, that mediates the surface-based motility called twitching. Together, our findings reveal a new role for substrate softness in the spatial organization of bacteria in complex microenvironments, with far-reaching consequences on efficient biofilm formation.
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Dates et versions

hal-03798581 , version 1 (05-10-2022)
hal-03798581 , version 2 (10-05-2023)

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Sofia Gomez Ho, Lionel Bureau, Karin John, Delphine Débarre, Sigolène Lecuyer. Substrate stiffness impacts early biofilm formation by modulating Pseudomonas aeruginosa twitching motility. 2022. ⟨hal-03798581v1⟩
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