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Competition in biofilms between cystic fibrosis isolates of Pseudomonas aeruginosa is driven by R-pyocins

Olubukola Oluyombo, Stephen P. Diggle, Christopher N. Penfold
doi: https://doi.org/10.1101/264580
Olubukola Oluyombo
School of Life Sciences, University of Nottingham, University Park, Nottingham, NG7 2RD, UK
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Stephen P. Diggle
School of Biological Sciences, Georgia Institute of Technology, Atlanta, GA 30332, USA
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Christopher N. Penfold
School of Life Sciences, University of Nottingham, University Park, Nottingham, NG7 2RD, UK
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ABSTRACT

Pseudomonas aeruginosa is an opportunistic pathogen responsible for a number of different human infections and is the leading cause of morbidity and mortality in cystic fibrosis (CF) patients. P. aeruginosa infections are difficult to treat due to a number of antibiotic resistance mechanisms and the organisms propensity to form multicellular biofilms. Epidemic strains of P. aeruginosa often dominate within the lungs of individual CF patients, but how they achieve this is poorly understood. One of the ways strains of P. aeruginosa can compete, is by producing chromosomally encoded bacteriocins, called pyocins. Three major classes of pyocin have been identified in P. aeruginosa: soluble pyocins (S-types) and tailocins (R- and F-types). In this study, we investigated the distribution of S- and R-type pyocins in 24 clinical strains isolated from individual CF patients and then focused on understanding their roles on inter-strain competition. We found that (i) each strain produced only one R-pyocin type, but the number of S-pyocins varied between strains; (ii) R-pyocins were crucial for strain dominance during competition assays in planktonic cultures and within biofilms; (iii) purified R-pyocins demonstrated significant antimicrobial activity against established biofilms. Our work provides clear support for a key role played by R-pyocins in the competition between P. aeruginosa strains, and may help explain why certain strains and lineages of P. aeruginosa dominate and displace others during CF lung infection. Furthermore, we demonstrate the potential of exploiting R-pyocins for therapeutic gains in an era when antibiotic resistance is a global concern.

IMPORTANCE A major clinical problem caused by Pseudomonas aeruginosa, is chronic biofilm infection of the lungs in individuals with cystic fibrosis (CF). Epidemic P. aeruginosa strains dominate and displace others during CF infection, but these intra-species interactions remain poorly understood. Here we demonstrate that R-pyocins (bacterocins) are important factors in driving competitive interactions in biofilms between P. aeruginosa strains isolated from different CF patients. In addition, we found that these phage-like pyocins are inhibitory against mature biofilms of susceptible strains. This highlights the potential of R-pyocins as antimicrobial and antibiofilm agents, at a time when new antimicrobial therapies are desperately needed.

Footnotes

  • Author contributions: O.O., C.N.P. and S.P.D. conceived the study, analyzed data and wrote the paper; O.O. performed the experimental work

Copyright 
The copyright holder for this preprint is the author/funder, who has granted bioRxiv a license to display the preprint in perpetuity. It is made available under a CC-BY-NC-ND 4.0 International license.
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Posted August 21, 2018.
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Competition in biofilms between cystic fibrosis isolates of Pseudomonas aeruginosa is driven by R-pyocins
Olubukola Oluyombo, Stephen P. Diggle, Christopher N. Penfold
bioRxiv 264580; doi: https://doi.org/10.1101/264580
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Competition in biofilms between cystic fibrosis isolates of Pseudomonas aeruginosa is driven by R-pyocins
Olubukola Oluyombo, Stephen P. Diggle, Christopher N. Penfold
bioRxiv 264580; doi: https://doi.org/10.1101/264580

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