2023
Advancing evolution: Bacteria break down gene silencer to express horizontally acquired genes
Groisman E, Choi J. Advancing evolution: Bacteria break down gene silencer to express horizontally acquired genes. BioEssays 2023, 45: e2300062. PMID: 37533411, PMCID: PMC10530229, DOI: 10.1002/bies.202300062.Peer-Reviewed Original ResearchConceptsH-NSAT-rich DNAHeat-stable nucleoid-structuring (H-NS) proteinConserved amino acid sequencesNucleoid structuring proteinHorizontal gene transferAmino acid sequenceSalmonella enterica serovar TyphimuriumBacterial evolutionLon proteaseProtease LonDiverse bacteriaEnterica serovar TyphimuriumRNA polymeraseAlternative promotersAcid sequenceStructuring proteinGene silencersGenesCleavage siteEnteric bacteriaEscherichia coliGene transferCommensal Escherichia coliSerovar TyphimuriumHow Bacterial Pathogens Coordinate Appetite with Virulence
Pokorzynski N, Groisman E. How Bacterial Pathogens Coordinate Appetite with Virulence. Microbiology And Molecular Biology Reviews 2023, 87: e00198-22. PMID: 37358444, PMCID: PMC10521370, DOI: 10.1128/mmbr.00198-22.Peer-Reviewed Original ResearchConceptsVirulence factorsTyphoid-like diseaseIntestinal inflammationFacultative intracellular pathogenImmunocompetent humansGut microbiotaPathogenic outcomesUtilization determinantsIntracellular pathogensSpecific nutrientsAntimicrobial agentsInfectionBacterial pathogensSerovar TyphimuriumBacterial virulencePathogensPathogenic traitsAnimal hostsPathwaySuch pathwaysCertain pathwaysMetabolic pathwaysVirulence programInflammationVirulence
2022
Differential synthesis of novel small protein times Salmonella virulence program
Salvail H, Choi J, Groisman EA. Differential synthesis of novel small protein times Salmonella virulence program. PLOS Genetics 2022, 18: e1010074. PMID: 35245279, PMCID: PMC8896665, DOI: 10.1371/journal.pgen.1010074.Peer-Reviewed Original ResearchConceptsVirulence programPhoP/PhoQCold-blooded animalsSalmonella enterica serovar TyphimuriumAncestral regulatorGene organizationBicistronic operonEnterica serovar TyphimuriumPolycistronic mRNACellular processesGene controlCorresponding proteinMRNA speciesOperonPhoP phosphorylationGenesSerovar TyphimuriumDifferential synthesisPremature activationS. entericaMRNATranslationUgtLPhoQRibosomes
2021
RNA chaperone activates Salmonella virulence program during infection
Choi J, Salvail H, Groisman EA. RNA chaperone activates Salmonella virulence program during infection. Nucleic Acids Research 2021, 49: 11614-11628. PMID: 34751407, PMCID: PMC8599858, DOI: 10.1093/nar/gkab992.Peer-Reviewed Original ResearchConceptsPhoP activationVirulence regulator PhoPWild-type virulenceBacterium Salmonella enterica serovar TyphimuriumWild-type S. typhimuriumSalmonella enterica serovar TyphimuriumRNA chaperonesEnterica serovar TyphimuriumRegulator PhoPRedundant proteinsMutant behavesVirulence programVirulence roleS. typhimuriumInside macrophagesSecondary structureSerovar TyphimuriumCritical functionsVirulence genesChaperonesPhoPMutantsRibosomesOrganismsCSPCHow the PhoP/PhoQ System Controls Virulence and Mg2+ Homeostasis: Lessons in Signal Transduction, Pathogenesis, Physiology, and Evolution
Groisman EA, Duprey A, Choi J. How the PhoP/PhoQ System Controls Virulence and Mg2+ Homeostasis: Lessons in Signal Transduction, Pathogenesis, Physiology, and Evolution. Microbiology And Molecular Biology Reviews 2021, 85: 10.1128/mmbr.00176-20. PMID: 34191587, PMCID: PMC8483708, DOI: 10.1128/mmbr.00176-20.Peer-Reviewed Original ResearchConceptsPhoP/PhoQ systemPhoP/PhoQSignal transductionAbundance of hundredsGram-negative bacterial speciesTwo-component systemSalmonella enterica serovar TyphimuriumRegulatory RNAsEnterica serovar TyphimuriumTranscription factorsProtease regulatorsTranscriptional effectsCationic antimicrobial peptidesInducing conditionsBacterial speciesSerovar TyphimuriumPhysiological consequencesAntimicrobial peptidesPhoQTransductionVirulenceHomeostasisAbundanceNovel formPhoPLow Cytoplasmic Magnesium Increases the Specificity of the Lon and ClpAP Proteases
Yeom J, Groisman EA. Low Cytoplasmic Magnesium Increases the Specificity of the Lon and ClpAP Proteases. Journal Of Bacteriology 2021, 203: 10.1128/jb.00143-21. PMID: 33941609, PMCID: PMC8223949, DOI: 10.1128/jb.00143-21.Peer-Reviewed Original ResearchConceptsBacterium Salmonella enterica serovar TyphimuriumCytoplasmic MgSalmonella enterica serovar TyphimuriumLon substratesClpAP proteaseEnterica serovar TyphimuriumAntibiotic persistenceEnteric bacteriaSerovar TyphimuriumSpectrum of substratesPhoP proteinProtease LonAcetyl coenzyme ATranscriptional regulatorsProtein bindsPhoP boxRegulatory proteinsProtease specificityPromoter regionCritical regulatorProtein synthesisLiving cellsLonPhoPEscherichia coliReduced ATP-dependent proteolysis of functional proteins during nutrient limitation speeds the return of microbes to a growth state
Yeom J, Groisman EA. Reduced ATP-dependent proteolysis of functional proteins during nutrient limitation speeds the return of microbes to a growth state. Science Signaling 2021, 14 PMID: 33500334, PMCID: PMC8378506, DOI: 10.1126/scisignal.abc4235.Peer-Reviewed Original ResearchConceptsATP-dependent proteolysisSlow-growth stateFunctional proteinsGrowth stateATP-dependent proteaseTranscriptional regulator PhoPProtein preservationNutrient limitation conditionsRapid growth statesRegulator PhoPMicrobial strategiesNonfunctional proteinNutrient limitationProtein degradationNitrogen conditionsSame proteaseMagnesium starvationSerovar TyphimuriumProteinLimitation conditionsProteolysisIntracellular ATPParticular nutrientsStationary phaseIntracellular concentration
2020
DNA supercoiling differences in bacteria result from disparate DNA gyrase activation by polyamines
Duprey A, Groisman EA. DNA supercoiling differences in bacteria result from disparate DNA gyrase activation by polyamines. PLOS Genetics 2020, 16: e1009085. PMID: 33125364, PMCID: PMC7598504, DOI: 10.1371/journal.pgen.1009085.Peer-Reviewed Original ResearchConceptsE. coli enzymeDNA supercoilingColi enzymeDNA supercoiling resultsGlobal DNA supercoilingDNA gyraseSignal transduction pathwaysAmino acid identityDNA gyrase activityE. coliSpecies Escherichia coliSalmonella enterica serovar TyphimuriumEnterica serovar TyphimuriumAcid identityTransduction pathwaysPrecursor putrescineGyrase activitySupercoilingHigh extracellular Mg2DNA gyrasesPolyamines spermidineEscherichia coliTopoisomerase ISerovar TyphimuriumDisparate activationHorizontally acquired regulatory gene activates ancestral regulatory system to promote Salmonella virulence
Choi J, Groisman EA. Horizontally acquired regulatory gene activates ancestral regulatory system to promote Salmonella virulence. Nucleic Acids Research 2020, 48: 10832-10847. PMID: 33045730, PMCID: PMC7641745, DOI: 10.1093/nar/gkaa813.Peer-Reviewed Original ResearchConceptsPhoP/PhoQAncestral regulatorNucleoid structuring protein H-NSProtein H-NSS. bongoriSalmonella enterica serovar TyphimuriumAncestral genomesH-NSTarget promotersEnterica serovar TyphimuriumRegulatory genesBacterial virulenceSalmonella virulencePromoter regionSsrBOpposite regulationGenesS. typhimuriumPhoQRegulatory systemSerovar TyphimuriumVirulenceTranscriptionPromoterRegulatorHow Pathogens Feel and Overcome Magnesium Limitation When in Host Tissues
Blanc-Potard AB, Groisman EA. How Pathogens Feel and Overcome Magnesium Limitation When in Host Tissues. Trends In Microbiology 2020, 29: 98-106. PMID: 32807623, PMCID: PMC7855738, DOI: 10.1016/j.tim.2020.07.003.Peer-Reviewed Original ResearchConceptsNutritional immunityHost cell compartmentsAbundant divalent cationHost tissuesSalmonella enterica serovar TyphimuriumAvailability of nutrientsPathogen responseEnterica serovar TyphimuriumMacrophage proteinHost organismLiving cellsMagnesium limitationAmino acidsIntracellular pathogensSerovar TyphimuriumNutrient concentrationsCell compartmentPathogensDivalent cationsNutrientsMagnesium deprivationEssentialityOrganismsCytoplasmProteinSmall proteins regulate Salmonella survival inside macrophages by controlling degradation of a magnesium transporter
Yeom J, Shao Y, Groisman EA. Small proteins regulate Salmonella survival inside macrophages by controlling degradation of a magnesium transporter. Proceedings Of The National Academy Of Sciences Of The United States Of America 2020, 117: 20235-20243. PMID: 32753384, PMCID: PMC7443967, DOI: 10.1073/pnas.2006116117.Peer-Reviewed Original ResearchConceptsSmall proteinsAmino acid identityFacultative intracellular pathogenTransporter MgtAProtease FtsHMagnesium transportersAcid identityMacrophage proteinRelated transportersSame transcriptPathogen survivalMgtBIntracellular pathogensSerovar TyphimuriumProteinLimitation conditionsHost tissuesMgtROxidative stressTransportersSalmonella survivalSingular exampleFtsHMacrophagesMgtAThe phosphorelay BarA/SirA activates the non-cognate regulator RcsB in Salmonella enterica
Salvail H, Groisman EA. The phosphorelay BarA/SirA activates the non-cognate regulator RcsB in Salmonella enterica. PLOS Genetics 2020, 16: e1008722. PMID: 32392214, PMCID: PMC7241856, DOI: 10.1371/journal.pgen.1008722.Peer-Reviewed Original ResearchConceptsBarA/SirACell wall perturbationSet of genesBacterium Salmonella enterica serovar TyphimuriumOuter-membrane stressSalmonella enterica serovar TyphimuriumPhosphorelay proteinsPhosphorelay systemLuria-Bertani mediumEnterica serovar TyphimuriumRcsBEnvironmental stressGene transcriptionGene expressionWall perturbationDifferent regulatorsSpectrum of environmentsPhosphorelaySerovar TyphimuriumRegulatorRcsCProteinTranscriptionSalmonella entericaGenesSalmonella expresses foreign genes during infection by degrading their silencer
Choi J, Groisman EA. Salmonella expresses foreign genes during infection by degrading their silencer. Proceedings Of The National Academy Of Sciences Of The United States Of America 2020, 117: 8074-8082. PMID: 32209674, PMCID: PMC7149492, DOI: 10.1073/pnas.1912808117.Peer-Reviewed Original ResearchConceptsForeign genesH-NSForeign DNAHeat-stable nucleoid-structuring (H-NS) proteinH-NS bindingNucleoid structuring proteinGram-negative bacterial speciesFacultative intracellular pathogenPhoP proteinLon proteaseProtease LonRegulatory sequencesVirulence regulatorGene silencingIntramacrophage survivalStructuring proteinBacterial speciesGenesInside macrophagesIntracellular pathogensSerovar TyphimuriumUncovered mechanismProteinVirulence genesDNA
2018
A protein that controls the onset of a Salmonella virulence program
Yeom J, Pontes MH, Choi J, Groisman EA. A protein that controls the onset of a Salmonella virulence program. The EMBO Journal 2018, 37: embj201796977. PMID: 29858228, PMCID: PMC6043847, DOI: 10.15252/embj.201796977.Peer-Reviewed Original ResearchConceptsVirulence programBacterial inner membraneMaster virulence regulatorC-terminal domainHost tissuesAnti-virulence factorMgtC proteinInner membraneGenetic programVirulence regulatorConstitutive promoterGene transcriptionIntramacrophage survivalSame mRNAAntibiotic toleranceATP synthesisPathogen survivalGenesMetabolic adaptationCytoplasmic pHSerovar TyphimuriumPathogen persistenceVirulence genesProteinMechanism of actionProtein synthesis controls phosphate homeostasis
Pontes MH, Groisman EA. Protein synthesis controls phosphate homeostasis. Genes & Development 2018, 32: 79-92. PMID: 29437726, PMCID: PMC5828397, DOI: 10.1101/gad.309245.117.Peer-Reviewed Original ResearchConceptsPi starvation responsesStarvation responseProtein synthesisPi transporter genesProtein synthesis controlATP consumptionPi starvationRegulatory connectionsPi homeostasisTransporter geneExtracellular milieuCytoplasmic MgCytoplasmic PiSerovar TyphimuriumPharmacological inhibitionATP levelsRibosomesCytoplasmic magnesiumBacteriumHomeostasisSynthesis controlPhoBSaccharomycesTranscriptionYeast
2015
The Bacterial Transcription Termination Factor Rho Coordinates Mg2+ Homeostasis with Translational Signals
Kriner MA, Groisman EA. The Bacterial Transcription Termination Factor Rho Coordinates Mg2+ Homeostasis with Translational Signals. Journal Of Molecular Biology 2015, 427: 3834-3849. PMID: 26523680, PMCID: PMC4964609, DOI: 10.1016/j.jmb.2015.10.020.Peer-Reviewed Original ResearchMeSH Keywords5' Untranslated RegionsAmino Acid SequenceBacterial ProteinsBase SequenceCation Transport ProteinsGene Expression Regulation, BacterialHomeostasisInverted Repeat SequencesMagnesiumMolecular Sequence DataNucleic Acid ConformationProtein BiosynthesisRho FactorSalmonella typhimuriumTranscription Initiation SiteConceptsLeader regionTranslational signalsGenome-wide activityShort open reading framesRho utilization siteRho-dependent terminationRho-dependent terminatorsOpen reading frameSalmonella enterica serovar TyphimuriumNascent RNATranscription terminationEnterica serovar TyphimuriumTransport genesProtein RhoRNA polymeraseReading frameLeader mRNASpecific genesRNA conformationEfficient translationExclusive conformationsTranscriptionSerovar TyphimuriumGenesRhoSalmonella promotes virulence by repressing cellulose production
Pontes MH, Lee EJ, Choi J, Groisman EA. Salmonella promotes virulence by repressing cellulose production. Proceedings Of The National Academy Of Sciences Of The United States Of America 2015, 112: 5183-5188. PMID: 25848006, PMCID: PMC4413311, DOI: 10.1073/pnas.1500989112.Peer-Reviewed Original ResearchConceptsCellulose synthesisWild-type phenotypeWild-type virulenceSalmonella enterica serovar TyphimuriumCyclic diguanylateEnterica serovar TyphimuriumPathogen fitnessAbundant organic polymerMgtC geneAcute virulenceAllosteric activatorAbiotic surfacesMgtC mutantInside macrophagesMutantsVirulence determinantsSerovar TyphimuriumVirulenceCellulose productionEnvironmental insultsCellulose levelsBCSAAttenuated mutantsTraitsDiguanylateFlagella-independent surface motility in Salmonella enterica serovar Typhimurium
Park SY, Pontes MH, Groisman EA. Flagella-independent surface motility in Salmonella enterica serovar Typhimurium. Proceedings Of The National Academy Of Sciences Of The United States Of America 2015, 112: 1850-1855. PMID: 25624475, PMCID: PMC4330729, DOI: 10.1073/pnas.1422938112.Peer-Reviewed Original ResearchMeSH KeywordsAdenosine TriphosphatasesAmino Acid SequenceBacterial ProteinsBase SequenceCation Transport ProteinsComputational BiologyFlagellaGene Expression Regulation, BacterialMagnesiumMembrane Transport ProteinsMitochondrial Proton-Translocating ATPasesMolecular Sequence DataMovementMutagenesisSalmonella typhimuriumSequence AlignmentSequence Analysis, DNAConceptsSalmonella enterica serovar TyphimuriumEnterica serovar TyphimuriumPhoP/PhoQ regulatory systemMgtC mutantFlagellum-independent mannerFlagella-mediated motilitySerovar TyphimuriumForm of motilityWild-type SalmonellaNull mutantsMultiprotein complexesMgtC proteinF1Fo-ATPaseHeterologous promoterSmall proteinsUnknown functionProteinase K treatmentSurface motilityMgtAMutantsGroup motilityAllelic formsRegulatory systemBacterial replicationGenes
2013
Signal‐specific temporal response by the Salmonella PhoP/PhoQ regulatory system
Park S, Groisman EA. Signal‐specific temporal response by the Salmonella PhoP/PhoQ regulatory system. Molecular Microbiology 2013, 91: 135-144. PMID: 24256574, PMCID: PMC3890429, DOI: 10.1111/mmi.12449.Peer-Reviewed Original ResearchConceptsTransporter MgtATwo-component systems PhoP/PhoQPhoP-dependent genesAntimicrobial peptide C18G.PhoP/PhoQSalmonella enterica serovar TyphimuriumSensor PhoQEnterica serovar TyphimuriumVirulence functionsRepressing signalsGene setsPhoQMgtAGenesSerovar TyphimuriumElicit expressionPeriplasmPhoPActive formFull transcriptionExpressionPhoQ.TranscriptionCytoplasmicProteinThe lipopolysaccharide modification regulator PmrA limits Salmonella virulence by repressing the type three-secretion system Spi/Ssa
Choi J, Groisman EA. The lipopolysaccharide modification regulator PmrA limits Salmonella virulence by repressing the type three-secretion system Spi/Ssa. Proceedings Of The National Academy Of Sciences Of The United States Of America 2013, 110: 9499-9504. PMID: 23690578, PMCID: PMC3677452, DOI: 10.1073/pnas.1303420110.Peer-Reviewed Original ResearchConceptsPmrA proteinNull mutantsSalmonella virulenceThree secretion systemVirulence regulatory genesSalmonella enterica serovar TyphimuriumWild-type SalmonellaEnterica serovar TyphimuriumPmrA mutantRegulatory genesProtein bindsModification genesMurine typhoid feverControl expressionLPS modificationsPmrA geneMutantsGenesSerovar TyphimuriumPathogen persistenceAntimicrobial peptidesHost tissuesPromoterVirulenceProtein