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PXD042287

PXD042287 is an original dataset announced via ProteomeXchange.

Dataset Summary
TitleTranscriptomics and mutagenesis analysis uncover key mechanisms involved in polymyxin B resistance and heteroresistance of the neonatal sepsis pathogen Enterobacter bugandensis
DescriptionEnterobacter bugandensis is one of species from the E. cloacae complex (ECC) that has been predominantly associated to neonatal sepsis. A major concern with E. bugandensis and ECC bacteria in general is the frequent appearance of multidrug resistant isolates including those resistant to last-resort antibiotics, such as polymyxins, for which these microbes are in the ESKAPE list of global threat pathogens. Here, we investigated polymyxin B (PmB) resistance and heteroresistance in E. bugandensis by transcriptomics and a gene deletion approach using two clinical isolates. Genes encoded in the CrrAB-regulated operon including crrC and kexD were highly upregulated in both strains in the presence of PmB. We show in one of these isolates that ∆crrC and ∆kexD mutants exhibited lower levels of PmB resistance and heteroresistance than the parental strain. Moreover, the heterologous expression of CrrC and KexD proteins increased PmB resistance in a sensitive E. ludwigii clinical isolate and in the Escherichia coli K12 strain W3110. We also showed that the efflux pump AcrAB and TolC contribute to PmB resistance and heteroresistance. Deletion of the regulatory genes phoPQ and crrAB cause reduced PmB resistance and heteroresistance, while deletion of pmrAB did not have any effect. Our results also reveal that the addition of L-Ara4N into the lipid A, mediated by the arnBCADTEF operon, is critical to determine PmB resistance, while the deletion of eptA, encoding a PEtN transferase had no effect. Finally, PmB resistance did not correlate with pathogenicity in the Galleria mellonella infection model.
HostingRepositoryPRIDE
AnnounceDate2024-10-22
AnnouncementXMLSubmission_2024-10-22_06:35:11.280.xml
DigitalObjectIdentifier
ReviewLevelPeer-reviewed dataset
DatasetOriginOriginal dataset
RepositorySupportUnsupported dataset by repository
PrimarySubmitterNichollas Scott
SpeciesList scientific name: Enterobacter bugandensis; NCBI TaxID: 881260;
ModificationListNo PTMs are included in the dataset
InstrumentOrbitrap Fusion Lumos
Dataset History
RevisionDatetimeStatusChangeLog Entry
02023-05-17 05:56:14ID requested
12024-04-04 17:25:36announced
22024-10-22 06:35:12announced2024-10-22: Updated project metadata.
Publication List
Garc, í, a-Romero I, Srivastava M, Monjar, á, s-Feria J, Korankye SO, MacDonald L, Scott NE, Valvano MA, Drug efflux and lipid A modification by 4-L-aminoarabinose are key mechanisms of polymyxin B resistance in the sepsis pathogen Enterobacter bugandensis. J Glob Antimicrob Resist, 37():108-121(2024) [pubmed]
10.1016/j.jgar.2024.03.012;
Keyword List
submitter keyword: Enterobacter bugandensis, polymyxin B resistance
Contact List
Miguel A. Valvano
contact affiliationWellcome-Wolfson Institute for Experimental Medicine, Queen's University Belfast, BT9 7BL
contact emailm.valvano@qub.ac.uk
lab head
Nichollas Scott
contact affiliationUniversity of Melbourne
contact emailnichollas.scott@unimelb.edu.au
dataset submitter
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Dataset FTP location
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