2020
Crystal structure of a guanine nucleotide exchange factor encoded by the scrub typhus pathogen Orientia tsutsugamushi
Lim C, Berk JM, Blaise A, Bircher J, Koleske AJ, Hochstrasser M, Xiong Y. Crystal structure of a guanine nucleotide exchange factor encoded by the scrub typhus pathogen Orientia tsutsugamushi. Proceedings Of The National Academy Of Sciences Of The United States Of America 2020, 117: 30380-30390. PMID: 33184172, PMCID: PMC7720168, DOI: 10.1073/pnas.2018163117.Peer-Reviewed Original ResearchConceptsBacterial GEFStructure-guided mutational analysisExchange factor domainRho family GTPasesObvious sequence similarityRho GTPases Rac1Pathogen Orientia tsutsugamushiAlters cell morphologyInteraction screenConvergent evolutionGEF domainHost interactorsExchange factorNucleotide displacementGEF activityCellular processesSequence similarityCytoskeletal structuresGTPases Rac1Ectopic expressionMutational analysisGEFRac1Factor domainPathogenic bacterium
2017
Neurodevelopmental disease-associated de novo mutations and rare sequence variants affect TRIO GDP/GTP exchange factor activity
Katrancha SM, Wu Y, Zhu M, Eipper BA, Koleske AJ, Mains RE. Neurodevelopmental disease-associated de novo mutations and rare sequence variants affect TRIO GDP/GTP exchange factor activity. Human Molecular Genetics 2017, 26: 4728-4740. PMID: 28973398, PMCID: PMC5886096, DOI: 10.1093/hmg/ddx355.Peer-Reviewed Original ResearchMeSH KeywordsAmino Acid SequenceAnimalsDatabases, Nucleic AcidGuanine Nucleotide Exchange FactorsGuanosine DiphosphateGuanosine TriphosphateHEK293 CellsHumansMiceMice, KnockoutMutationNeurodevelopmental DisordersProtein DomainsProtein Serine-Threonine KinasesRac1 GTP-Binding ProteinRho GTP-Binding ProteinsRhoA GTP-Binding ProteinConceptsDe novo mutationsNeurodevelopmental disordersRare sequence variantsTriple functional domain proteinNovo mutationsComplex neurodevelopmental disorderBipolar disorderTherapeutic progressSequence variantsImpaired inhibitionProtein levelsDisordersMolecular pathwaysMillions of peopleIntellectual disabilityRare variantsNeurite outgrowthGenetic damageFactor activityMutationsExchange factor activityDistinct specificitiesPoor understandingRac1ActivityBrain Region and Isoform-Specific Phosphorylation Alters Kalirin SH2 Domain Interaction Sites and Calpain Sensitivity
Miller MB, Yan Y, Machida K, Kiraly DD, Levy AD, Wu YI, Lam TT, Abbott T, Koleske AJ, Eipper BA, Mains RE. Brain Region and Isoform-Specific Phosphorylation Alters Kalirin SH2 Domain Interaction Sites and Calpain Sensitivity. ACS Chemical Neuroscience 2017, 8: 1554-1569. PMID: 28418645, PMCID: PMC5517348, DOI: 10.1021/acschemneuro.7b00076.Peer-Reviewed Original ResearchConceptsLong-term potentiationCalpain sensitivityEffects of cocaineRat nucleus accumbensAdult rat nucleus accumbensRho GDP/GTP exchange factorRegion-specific effectsChronic cocaineNucleus accumbensSynaptic functionBrain regionsKALRN geneSpine morphologyPrefrontal cortexKal7CocainePotentiationFunctional significanceCalpainPhosphorylation
2006
Shigella IpgB1 promotes bacterial entry through the ELMO–Dock180 machinery
Handa Y, Suzuki M, Ohya K, Iwai H, Ishijima N, Koleske AJ, Fukui Y, Sasakawa C. Shigella IpgB1 promotes bacterial entry through the ELMO–Dock180 machinery. Nature Cell Biology 2006, 9: 121-128. PMID: 17173036, DOI: 10.1038/ncb1526.Peer-Reviewed Original ResearchMeSH KeywordsAdaptor Proteins, Signal TransducingAnimalsBacterial AdhesionCell LineCell MembraneDogsHeLa CellsHumansImmunoprecipitationMiceModels, BiologicalNIH 3T3 CellsProtein TransportRac GTP-Binding ProteinsRac1 GTP-Binding ProteinRNA InterferenceShigellaSignal TransductionTransduction, GeneticTransfectionConceptsMembrane rufflesCell motility proteinsRole of RhoGEpithelial cellsType III secretionWild-type cellsMembrane associationMotility proteinsPulldown assaysBinding partnerDock180 pathwayBacterial entryRufflesRac1 activityIpgB1EffectorsPivotal roleCellsELMODock180RhoGSpecial mechanismShigellaMachineryEngulfment