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Inactivation of the gene encoding the cationic antimicrobial peptide resistance factor MprF increases biofilm formation but reduces invasiveness of Listeria monocytogenes

Nowak, Jessika, Visnovsky, Sandra, Cruz, Cristina D., Fletcher, Graham, van Vliet, Arnoud H.M, Hedderley, Duncan, Butler, Ruth, Flint, Steve, Palmer, Jon and Pitman, Andrew (2020) Inactivation of the gene encoding the cationic antimicrobial peptide resistance factor MprF increases biofilm formation but reduces invasiveness of Listeria monocytogenes Journal of Applied Microbiology.

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Abstract

Aims To understand the genetics involved in surface attachment and biofilm formation of Listeria monocytogenes. Methods and Results An in vitro screen of a Himar1 transposon library of L. monocytogenes strain 15G01 identified three transposants that produced significantly different biofilm levels when compared to the wild-type strain; two mutants exhibited enhanced biofilm formation and one produced less biofilm biomass than the wild-type. The mutant 15G01 mprF::Himar1, which had a transposon insertion in the mprF gene, was selected 29 for further analysis. The mutant produced a more densely populated biofilm on solid surfaces such as 30 stainless steel and polystyrene, as determined using scanning electron and light microscopy. The 15G01 31 mprF::Himar1 mutant remained viable in biofilms, but showed an increase in sensitivity to the cationic 32 antimicrobial gallidermin. The mutant also displayed reduced invasiveness in CaCo-2 intestinal cells, 33 suggesting virulence properties are compromised by the inactivation of mprF. 34 Conclusions 35 Biofilm formation and gallidermin resistance of L. monocytogenes is influenced by mprF, but this trait is 36 associated with a compromise in invasiveness. 37 Significance 38 The presence of pathogenic microorganisms in the food processing environment can cause a significant 39 problem, especially when these microorganisms are established as biofilms. This study shows that the 40 inactivation of the mprF gene results in enhanced biofilm formation and abiotic surface attachment of 41 Listeria monocytogenes.

Item Type: Article
Divisions : Faculty of Health and Medical Sciences > School of Veterinary Medicine
Authors :
NameEmailORCID
Nowak, Jessika
Visnovsky, Sandra
Cruz, Cristina D.
Fletcher, Graham
van Vliet, Arnoud H.Ma.vanvliet@surrey.ac.uk
Hedderley, Duncan
Butler, Ruth
Flint, Steve
Palmer, Jon
Pitman, Andrew
Date : 20 July 2020
Funders : New Zealand Ministry of Business, Innovation and Employment, Cawthron Independent Research Organisation
DOI : 10.1111/jam.14790
Grant Title : Cawthron Independent Research Organisation
Copyright Disclaimer : © 2020 Society for Applied Microbiology
Uncontrolled Keywords : Listeria monocytogenes; Mutagenesis library; Biofilm; mprF
Additional Information : Embargo OK Metadata Pending
Depositing User : James Marshall
Date Deposited : 29 Jul 2020 15:21
Last Modified : 29 Jul 2020 15:21
URI: http://epubs.surrey.ac.uk/id/eprint/858323

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