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Hfq Regulates Efflux Pump Expression and Purine Metabolic Pathway to Increase the Trimethoprim Resistance in Aeromonas veronii

ABSTRACT:

Aeromonas veronii (A. veronii) is a zoonotic pathogen. It causes clinically a variety of diseases such as dysentery, bacteremia, and meningitis. And it also brings huge losses to aquaculture. A. veronii has been documented as a multiple antibiotic resistant bacterium. Hfq (host factor for RNA bacteriophage Qβ replication) plays vital regulation roles in a variety of cell programs. The deletion of hfq in A. veronii showed an increased sensitivity to the trimethoprim, accompanying by the down regulation of the efflux pump related genes acrA and acrB in transcriptomic data. Coherently, the complementation of acrA and acrB in ∆hfq recovered the trimethoprim resistance. Besides, the productions of adenosine and guanosine were revealed to augment in ∆hfq in metabonomic data. Both wild type and ∆hfq conferred more sensitive to trimethoprim after appending 1 mM adenosine or guanosine to M9 medium. These results demonstrated that Hfq mediated trimethoprim resistance by elevating efflux pump expression and degrading adenosine, and guanosine metabolites. Collectively, Hfq is a potential target to tackle trimethoprim resistance in A. veronii infection.

INSTRUMENT(S): Liquid Chromatography MS - positive - hilic, Liquid Chromatography MS - negative - hilic

SUBMITTER: Dan Wang

PROVIDER: MTBLS1411 | MetaboLights | 2020-02-19

REPOSITORIES: MetaboLights

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			Action	DRS
	MTBLS1411	Other
	FILES	Other
	a_MTBLS1411_LC-MS_negative_hilic_metabolite_profiling.txt	Txt
	a_MTBLS1411_LC-MS_positive_hilic_metabolite_profiling.txt	Txt
	i_Investigation.txt	Txt

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MetaboLights MTBLS1411 - GNPS Hfq Regulates Efflux Pump Expression and Purine Metabolic Pathway to Increase the Trimethoprim Resistance in Aeromonas veronii

Project description:<p>Aeromonas veronii (A. veronii) is a zoonotic pathogen. It causes clinically a variety of diseases such as dysentery, bacteremia, and meningitis. And it also brings huge losses to aquaculture. A. veronii has been documented as a multiple antibiotic resistant bacterium. Hfq (host factor for RNA bacteriophage Q? replication) plays vital regulation roles in a variety of cell programs. The deletion of hfq in A. veronii showed an increased sensitivity to the trimethoprim, accompanying by the down regulation of the efflux pump related genes acrA and acrB in transcriptomic data. Coherently, the complementation of acrA and acrB in ?hfq recovered the trimethoprim resistance. Besides, the productions of adenosine and guanosine were revealed to augment in ?hfq in metabonomic data. Both wild type and ?hfq conferred more sensitive to trimethoprim after appending 1 mM adenosine or guanosine to M9 medium. These results demonstrated that Hfq mediated trimethoprim resistance by elevating efflux pump expression and degrading adenosine, and guanosine metabolites. Collectively, Hfq is a potential target to tackle trimethoprim resistance in A. veronii infection.</p>

2020-07-20 | MSV000085794 | GNPS

MpeR regulation in Neisseria gonorrhoeae (F19) through an iron-responsive mechanism

Project description:Previous studies have shown that the MpeR transcriptional regulator produced by Neisseria gonorrhoeae represses expression of mtrF, which encodes a putative inner membrane protein that works with the MtrC-MtrD-MtrE efflux pump to allow gonococci to resist high levels of multiple hydrophobic antimicrobials. Regulation of mpeR has been reported to occur by an iron-dependent mechanism involving Fur (Ferric uptake regulator). Collectively, these observations suggest the presence of an interconnected regulatory system in gonococci that modulates expression of drug efflux pump protein-encoding genes in an iron-responsive manner. Herein, we describe this connection and report that levels of gonococcal resistance to a substrate of the mtrCDE-encoded efflux pump can be modulated by MpeR and the availability of free iron. Using microarray analysis, we found that the mtrR gene, which encodes the direct transcriptional repressor (MtrR) of mtrCDE, is an MpeR-repressed determinant in the late-logarithmic phase of growth when free iron levels would be reduced due to bacterial consumption. MpeR-mediated repression of mtrR appeared to be direct, as judged by DNA-binding analyses, and was enhanced by conditions of iron-limitation, which resulted in increased expression of the mtrCDE efflux pump operon. Taken together, our results indicate that both genetic and physiologic parameters can influence expression of the mtr efflux system and that these can modulate levels of gonococcal susceptibility to efflux pump substrates. two strains, two growth phases, three replicates each.

2012-04-03 | E-GEOD-32717 | biostudies-arrayexpress

MpeR regulation in Neisseria gonorrhoeae (F19) through an iron-responsive mechanism

2012-04-04 | GSE32717 | GEO

Uncovering a new role for MexMN-OprM in efflux of β-lactams and a novel regulatory circuit (MmnRS) controlling MexMN expression

Project description:Target (MexB) and efflux based mechanisms decreasing the effectiveness of the efflux pump inhibitor D13-9001 in P. aeruginosa PAO1: uncovering a new role for MexMN-OprM in efflux of β-lactams and a novel regulatory circuit (MmnRS) controlling MexMN expression Efflux pumps contribute to antibiotic resistance in Gram-negative pathogens. Correspondingly, efflux pump inhibitors (EPIs) may reverse this resistance. D13-9001 specifically inhibits MexAB-OprM in P. aeruginosa. Mutants with decreased susceptibility to MexAB-OprM inhibition by D13-9001 were identified and these fell into two categories; those having alterations in the target MexB (F628L and ΔV177) and those with mutations in PA1438 (L172P substitution) which encoded a putative sensor kinase of unknown function. The alterations in MexB were consistent with reported structural studies of D13-9001 interaction with MexB. The PA1438L172P alteration mediated a >150-fold upregulation of MexMN pump gene expression and >50-fold upregulation of PA1438 and the neighboring response regulator gene PA1437. We propose that these be renamed as mmnR/mmnS for MexMN Regulator and Sensor. MexMN was shown to partner with the outer membrane channel protein OprM and to pump several β-lactams, monobactams and tazobactam. Upregulated MexMN functionally replaced MexAB-OprM to efflux these compounds but was insusceptible to inhibition by D13-9001. MmnSL172P also mediated a decrease in susceptibility to imipenem / biapenem that was independent of MexMN-OprM. Expression of oprD, encoding the uptake channel for these compounds was downregulated, suggesting that this channel is also part of the MmnSR regulon. RNA-seq of cells encoding MmnSL172P revealed among other things an interrelationships between regulation of mexMN and genes involved in heavy metal resistance.

2018-12-07 | GSE123403 | GEO

Identification of the EmrR regulon in Chromobacterium violaceum

Project description:Antibiotic resistance can arise by several mechanisms, including mutation in transcription factors that regulate drug efflux pumps. In this work, we identified EmrR as a MarR family transcription factor involved in antibiotic resistance in Chromobacterium violaceum, a Gram-negative bacterium that occurs in soil and water and can act as a human opportunistic pathogen. Antibiogram and minimum inhibitory concentration (MIC) assays showed that the ΔemrR mutant presented increased resistance to the antibiotic nalidixic acid in respect to the wild-type strain. The emrR gene is near to a putative operon emrCAB, which encode the efflux pump EmrCAB. DNA Microarray analysis showed that EmrR represses the emrCAB operon and some other putative transporters. Northern blot assays validated that EmrR represses the emrCAB operon and this repression can be released by salicylate, but not other compounds such as nalidixic acid or ethidium bromide. Electrophoretic mobility shift assays (EMSA) showed that EmrR binds directly to the promoter regions of emrR, emrCAB and other genes to exert negative regulation. Therefore, in response to compounds as salicylate, EmrR derepresses the operon emrCAB causing overexpression of the efflux pump EmrCAB and increased resistance to nalidixic acid in C. violaceum.

2018-11-01 | GSE112521 | GEO

Mutations in Multidrug Efflux Pumps of Eshcerichia coli

Project description:The number and overlapping substrate repertoire of multidrug efflux pumps in the E. coli genome suggest a physiological role apart from multidrug resistance. This role was investigated using transcriptomic analyses of cDNAs labeled from E. coli AG102 mRNA (hyper drug resistant, marR1) and its isogenic major efflux pump mutants. Keywords: Mutation Analysis

2008-03-11 | GSE10757 | GEO

The cyclic-AMP binding domain of the efflux pump Rv3728 acts as a regulator of phosphatidyl-myo-inositol mannosides composition in Mycobacterium tuberculosis

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2024-06-10 | GSE268977 | GEO

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The impaired quorum sensing response of MexAB-OprM efflux pump overexpressing mutants is not due to non-physiological efflux of 3-oxo-C12-HSL

Project description:Multidrug (MDR) efflux pumps are ancient and conserved molecular machineries with relevant roles in different aspects of the bacterial physiology, besides antibiotic resistance. In the case of the environmental opportunistic pathogen Pseudomonas aeruginosa, it has been shown that overexpression of different efflux pumps is linked to the impairment of the quorum sensing (QS) response. Nevertheless, the causes of such impairment are different for each analyzed efflux pump. Herein, we performed an in-depth analysis of the QS-mediated response of a P. aeruginosa antibiotic resistant mutant that overexpresses MexAB-OprM. Although previous work claimed that this efflux pump extrudes the QS signal 3-oxo-C12-HSL, we show otherwise. Our results evidence that the observed attenuation in the QS response when overexpressing this pump is related to an impaired production of alkyl quinolone QS signals, likely prompted by the reduced availability of one of their precursors, the octanoate. Together with previous studies, this indicates that, although the consequences of overexpressing efflux pumps are similar (impaired QS response), the underlying mechanisms are different. This ‘apparent redundancy' of MDR efflux systems can be understood as a P. aeruginosa strategy to keep the robustness of the QS regulatory network and modulate its output in response to different signals.

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