Featured Publications
Legionella pneumophila proteins that regulate Rab1 membrane cycling
Ingmundson A, Delprato A, Lambright DG, Roy CR. Legionella pneumophila proteins that regulate Rab1 membrane cycling. Nature 2007, 450: 365-369. PMID: 17952054, DOI: 10.1038/nature06336.Peer-Reviewed Original ResearchConceptsDrrA proteinRab1 functionMembrane cyclingGTPase-activating protein activityIntracellular pathogen Legionella pneumophilaRecruitment of Rab1Pathogen-occupied vacuolesPathogen Legionella pneumophilaDistinct biochemical reactionsL. pneumophilaLegionella pneumophilaRab1 activityRab1 activationRab proteinsEukaryotic cellsExchange factorGTP hydrolysisProtein activityRab1Membrane functionBacterial replicationProteinBiochemical reactionsPneumophilaVacuolesAsc and Ipaf Inflammasomes Direct Distinct Pathways for Caspase-1 Activation in Response to Legionella pneumophila
Case CL, Shin S, Roy CR. Asc and Ipaf Inflammasomes Direct Distinct Pathways for Caspase-1 Activation in Response to Legionella pneumophila. Infection And Immunity 2009, 77: 1981-1991. PMID: 19237518, PMCID: PMC2681768, DOI: 10.1128/iai.01382-08.Peer-Reviewed Original Research
2024
The T4bSS of Legionella features a two-step secretion pathway with an inner membrane intermediate for secretion of transmembrane effectors.
Malmsheimer S, Grin I, Bohn E, Franz-Wachtel M, Macek B, Sahr T, Smollich F, Chetrit D, Meir A, Roy C, Buchrieser C, Wagner S. The T4bSS of Legionella features a two-step secretion pathway with an inner membrane intermediate for secretion of transmembrane effectors. PLOS Pathogens 2024, 20: e1012118. PMID: 39546547, PMCID: PMC11602083, DOI: 10.1371/journal.ppat.1012118.Peer-Reviewed Original ResearchConceptsEukaryotic host cellsEffector proteinsMembrane intermediatesC-terminal secretion signalHost cellsSoluble effector proteinsCytoplasmic sideBacterial inner membraneMechanism of secretionSecretion systemSecretion signalPeriplasmic loopTransmembrane effectorSecretion pathwayT4BSSInner membraneSubcellular locationIntracellular survivalMembrane targetingProtein complexesEfficient translocationBacterial cellsProteomic analysisL. pneumophilaSecretion process
2010
Inhibition of pathogen-induced apoptosis by a Coxiella burnetii type IV effector protein
Lührmann A, Nogueira CV, Carey KL, Roy CR. Inhibition of pathogen-induced apoptosis by a Coxiella burnetii type IV effector protein. Proceedings Of The National Academy Of Sciences Of The United States Of America 2010, 107: 18997-19001. PMID: 20944063, PMCID: PMC2973885, DOI: 10.1073/pnas.1004380107.Peer-Reviewed Original ResearchConceptsPathogen-induced apoptosisEffector proteinsMammalian hostsL. pneumophila effector proteinsType IV effector proteinsHost cellsType IV secretion systemMammalian host cellsL. pneumophilaGain of functionProtein repertoireOrganelle traffickingRepeat familyDistinct hostsSecretion systemInfection strategiesProtozoan hostsApoptosis pathwayIntracellular bacteriaIntracellular replicationVirulence determinantsProteinLegionella pneumophilaApoptosisPathogens
2001
How the parasitic bacterium Legionella pneumophila modifies its phagosome and transforms it into rough ER: implications for conversion of plasma membrane to the ER membrane.
Tilney L, Harb O, Connelly P, Robinson C, Roy C. How the parasitic bacterium Legionella pneumophila modifies its phagosome and transforms it into rough ER: implications for conversion of plasma membrane to the ER membrane. Journal Of Cell Science 2001, 114: 4637-50. PMID: 11792828, DOI: 10.1242/jcs.114.24.4637.Peer-Reviewed Original ResearchMeSH KeywordsBacterial ProteinsCarrier ProteinsCell FractionationCell MembraneGram-Positive BacteriaHumansIntracellular MembranesLegionella pneumophilaLipid MetabolismLysosomesMembrane ProteinsMicroscopy, ElectronMitochondriaMolecular ChaperonesMutationOrganellesPhagosomesRibosomesTime FactorsU937 CellsConceptsPhagosomal membraneRough endoplasmic reticulumRough ERL. pneumophilaL. pneumophila mutantsBacterium Legionella pneumophilaMinutes of infectionLegionella pneumophilaInfected macrophagesER membraneCellular processesMitochondrial membranePlasma membraneER vesiclesEndoplasmic reticulumMacrophage infectionPhagosomesLack of cholesterolMitochondriaPneumophilaMembraneTiny hairsERMutants
2000
Identification and Subcellular Localization of the Legionella pneumophila IcmX Protein: a Factor Essential for Establishment of a Replicative Organelle in Eukaryotic Host Cells
Matthews M, Roy C. Identification and Subcellular Localization of the Legionella pneumophila IcmX Protein: a Factor Essential for Establishment of a Replicative Organelle in Eukaryotic Host Cells. Infection And Immunity 2000, 68: 3971-3982. PMID: 10858211, PMCID: PMC101675, DOI: 10.1128/iai.68.7.3971-3982.2000.Peer-Reviewed Original ResearchConceptsEukaryotic host cellsReplicative organelleGene productsHost cellsSecretion apparatusDot/Icm proteinsDot/icm genesWild-type L. pneumophilaL. pneumophila chromosomePathogen Legionella pneumophilaHost cell parasitismImmunoblot analysisMurine bone marrow-derived macrophagesL. pneumophilaConjugal transfer systemObvious orthologsBone marrow-derived macrophagesIcm genesBacterial periplasmCell parasitismMammalian macrophagesDeletion mutantsSubcellular localizationPhagosome biogenesisMarrow-derived macrophages
1998
Legionella pneumophila DotA protein is required for early phagosome trafficking decisions that occur within minutes of bacterial uptake
Roy C, Berger K, Isberg R. Legionella pneumophila DotA protein is required for early phagosome trafficking decisions that occur within minutes of bacterial uptake. Molecular Microbiology 1998, 28: 663-674. PMID: 9632267, DOI: 10.1046/j.1365-2958.1998.00841.x.Peer-Reviewed Original ResearchMeSH KeywordsAnimalsAntigens, CDBacterial ProteinsCell LineFluorescent Antibody TechniqueGTP-Binding ProteinsHumansLegionella pneumophilaLysosome-Associated Membrane GlycoproteinsLysosomesMacrophagesMembrane FusionMembrane GlycoproteinsMembrane ProteinsMiceMutationPhagosomesPlasmidsRab GTP-Binding ProteinsRab7 GTP-Binding ProteinsConceptsDotA mutantsL. pneumophila phagosomeLAMP-1DotA proteinL. pneumophilaMembrane-bound compartmentsLysosomal glycoprotein LAMP-1Bacterial pathogensIntracellular bacterial pathogenReplicative phagosomeSmall GTPVacuolar membraneEndocytic pathwayProtein Rab7Fusion eventsMutant bacteriaMolecular basisGenetic studiesBacterial uptakeMutantsPhagosomesTrafficking profilesContinuous expressionIntracellular sitesMacrophage uptake