Flagellar and twitching motility are necessary for Pseudomonas aeruginosa biofilm development
Abstract
The formation of complex bacterial communities known as biofilms begins with the interaction of planktonic cells with a surface in response to appropriate environmental signals. We report the isolation and characterization of mutants of Pseudomonas aeruginosa PA14 defective in the initiation of biofilm formation on an abiotic surface, polyvinylchloride (PVC) plastic. These mutants are designated surface attachment defective (sad ). Two classes of sad mutants were analysed: (i) mutants defective in flagellar-mediated motility and (ii) mutants defective in biogenesis of the polar-localized type IV pili. We followed the development of the biofilm formed by the wild type over 8 h using phase-contrast microscopy. The wild-type strain first formed a monolayer of cells on the abiotic surface, followed by the appearance of microcolonies that were dispersed throughout the monolayer of cells. Using time-lapse microscopy, we present evidence that microcolonies form by aggregation of cells present in the monolayer. As observed with the wild type, strains with mutations in genes required for the synthesis of type IV pili formed a monolayer of cells on the PVC plastic. However, in contrast to the wild-type strain, the type IV pili mutants did not develop microcolonies over the course of the experiments, suggesting that these structures play an important role in microcolony formation. Very few cells of a non-motile strain (carrying a mutation in flgK) attached to PVC even after 8 h of incubation, suggesting a role for flagella and/or motility in the initial cell-to-surface interactions. The phenotype of these mutants thus allows us to initiate the dissection of the developmental pathway leading to biofilm formation.
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Proteinaceous autoagglutinins include pili and fimbriae, flagella, large adhesin proteins such as M proteins and MSCRAMMs, and small β-barrel proteins.
“Proteinaceous autoagglutinins include pili and fimbriae [30],[46], flagella [28],[29], large adhesin proteins such as M proteins and MSCRAMMs (for microbial surface components recognising adhesive matrix molecules) [49],[52], and small β-barrel proteins [36],[56].”
From Bacterial autoaggregation (2018) · cites this paper as [46]
Autoaggregation can lead to microcolony formation and biofilm in two ways: single planktonic cells attach to the substrate and recruit other cells from suspension via autoagglutinins, or cells autoaggregate in solution and the aggregates settle on the substrate to initiate biofilm formation.
“Autoaggregation can lead to microcolony formation and biofilm in two ways (Figure 3). In the first, single planktonic cells attach to the substrate. This depends on expression of surface adhesins and possibly also motility factors [46]. Following this, these cells recruit other cells from suspension via autoagglutinins, leading to microcolony formation [75],[94].”
From Bacterial autoaggregation (2018) · cites this paper as [46]
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- Authors
- O'Toole, G. A., & Kolter, R.
- Affiliations
- Harvard University (US)
- Corresponding author
- Kolter, Roberto
- ORCID
- Kolter, Roberto
- Venue
- Molecular Microbiology
- Publisher
- Wiley
- Published
- 1998-10
- Volume
- 30
- Issue
- 2
- Pages
- 295-304
- ISSN
- 0950-382X (ISSN-L)
- 1365-2958
- OpenAlex
- W2016158447
- Cited by
- 2,697
- References
- 54
- Citations by year
- 2026: 50 · 2025: 77 · 2024: 82 · 2023: 90 · 2022: 125 · 2021: 131 · 2020: 115 · 2019: 117 · 2018: 89 · 2017: 109 · 2016: 136 · 2015: 140 · 2014: 155 · 2013: 125 · 2012: 133
- FWCI
- 13.28
- Type
- journal article
- Language
- en
- Open access
- closed
- Locations
- Molecular Microbiology (publishedVersion)
- PubMed (publishedVersion)
- Funders
- Damon Runyon Cancer Research Foundation
- National Institutes of Health
- National Institute of General Medical Sciences (R01GM058213, GM58213)
- Topics
- Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Bacterial biofilms and quorum sensing
- Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Biochemical and Structural Characterization
- Life Sciences › Biochemistry, Genetics and Molecular Biology › Genetics › Bacterial Genetics and Biotechnology
- Keywords
- Pseudomonas aeruginosa, biofilm formation, flagellar motility, twitching motility, type IV pili, surface adhesion, microcolony formation, cell aggregation, abiotic surfaces, polyvinyl chloride, biofilm growth
- MeSH terms
- Flagella, Microscopy, Phase-Contrast, Mutation, Fimbriae, Bacterial, Pseudomonas aeruginosa, Biofilms
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