PXD030337-1

PXD030337 is an original dataset announced via ProteomeXchange.

Title	Migration of Acanthamoeba through Legionella biofilms is regulated by bacterial quorum sensing, effectors and the flagellum
Description	Legionella pneumophila is a Gram-negative, environmental bacterium, which causes the life-threatening pneumonia Legionnaires’ disease. The facultative intracellular bacterium forms biofilms and employs the Icm/Dot type IV secretion system (T4SS) to replicate in amoebae and macrophages. The Legionella quorum sensing (Lqs) system and the transcription factor LvbR form a regulatory network controlling various traits, including bacterial motility, virulence and biofilm architecture. Here we show by comparative proteomics that in biofilms formed by L. pneumophila mutant strains lacking LvbR or the response regulator LqsR, proteins encoded by the 133 kb fitness island and components of the flagellum (FlaA) are downregulated. Confocal microscopy revealed that the ∆lqsR or ∆flaA mutant strains formed biofilms of the same patchy morphology as the parental strain JR32, while the ∆lvbR mutant forms a mat-like biofilm as previously shown. Acanthamoeba castellanii amoebae migrated more slowly through biofilms formed by the ∆lvbR, ∆lqsR or ∆flaA mutant strains, and amoebae migration was impaired in biofilms formed by L. pneumophila lacking a functional Icm/Dot T4SS (∆icmT) or the secreted effector proteins LegG1 and PpgA. Amoebae migrating through biofilms formed by JR32, ∆lvbR or ∆icmT were decorated by clusters of bacteria, while amoebae in ∆lqsR or ∆flaA biofilms were not. Taken together, the Lqs system, LvbR, FlaA and the Icm/Dot T4SS regulate migration of A. castellanii through L. pneumophila biofilms, and – with the exception of the T4SS – also regulate bacterial cluster formation on the amoeba. Hence, amoebae migration through L. pneumophila biofilms is regulated by bacterial quorum sensing, virulence and motility.
HostingRepository	PRIDE
AnnounceDate	2022-06-08
AnnouncementXML	Submission_2022-06-08_07:11:56.338.xml
DigitalObjectIdentifier
ReviewLevel	Peer-reviewed dataset
DatasetOrigin	Original dataset
RepositorySupport	Unsupported dataset by repository
PrimarySubmitter	Sandra Maass
SpeciesList	scientific name: Legionella pneumophila subsp. pneumophila str. Philadelphia 1; NCBI TaxID: 272624;
ModificationList	acetylated residue; monohydroxylated residue; iodoacetamide derivatized residue
Instrument	Q Exactive

Revision	Datetime	Status	ChangeLog Entry
0	2021-12-12 14:16:08	ID requested
⏵ 1	2022-06-08 07:11:56	announced

Dataset with its publication pending

submitter keyword: Amoeba, Acanthamoeba, cell migration, bacterial adherence, biofilm, cell-cell communication, flagellum, Legionella, response regulator, sensor kinase, transcription factor, quorum sensing

Dörte Becher
contact affiliation	Institute of Microbiology, University of Greifswald, Felix-Hausdorff-Strasse 8, 17489 Greifswald, Germany
contact email	dbecher@uni-greifswald.de
lab head
Sandra Maass
contact affiliation	University of Greifswald, Department for Microbial Proteomics
contact email	sandra.maass@uni-greifswald.de
dataset submitter

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PRIDE project URI

• PRIDE
  1. PXD030337
     1. Label: PRIDE project
     2. Name: Migration of Acanthamoeba through Legionella biofilms is regulated by bacterial quorum sensing, effectors and the flagellum