2024
Identification of the potassium-binding site in serotonin transporter
Hellsberg E, Boytsov D, Chen Q, Niello M, Freissmuth M, Rudnick G, Zhang Y, Sandtner W, Forrest L. Identification of the potassium-binding site in serotonin transporter. Proceedings Of The National Academy Of Sciences Of The United States Of America 2024, 121: e2319384121. PMID: 38652746, PMCID: PMC11067047, DOI: 10.1073/pnas.2319384121.Peer-Reviewed Original ResearchConceptsSerotonin transporterSite-directed mutagenesis of residuesMutagenesis of residuesSite-directed mutagenesisHeterologous expression systemStudy of vesiclesNa2 siteClearance of serotoninPatch-clamp recordingsExpression systemBinding residuesSequential bindingMolecular dynamics simulationsBinding sitesPotassium binding siteSubstrate accumulationClamp recordingsVesiclesResiduesTurnover rateBindingStructural studiesChemical gradientsBinding configurationsSynaptic cleft
2018
Structural elements required for coupling ion and substrate transport in the neurotransmitter transporter homolog LeuT
Zhang YW, Tavoulari S, Sinning S, Aleksandrova AA, Forrest LR, Rudnick G. Structural elements required for coupling ion and substrate transport in the neurotransmitter transporter homolog LeuT. Proceedings Of The National Academy Of Sciences Of The United States Of America 2018, 115: e8854-e8862. PMID: 30181291, PMCID: PMC6156673, DOI: 10.1073/pnas.1716870115.Peer-Reviewed Original ResearchConceptsTransporter domainConformational changesOpen stateSodium symporter familyIon-substrate couplingTransmembrane ion gradientsSymporter familyNSS transportersSubstrate bindingLeuTIntracellular substratesCysteine accessibilitySubstrate transportAccessibility of substrateTyrosine residuesConformational responseNa2 siteUncoupled movementIon gradientsExtracellular pathwaysMechanistic componentsTransportersProteinTransport of ionsBinding
2015
Two Na+ Sites Control Conformational Change in a Neurotransmitter Transporter Homolog*
Tavoulari S, Margheritis E, Nagarajan A, DeWitt DC, Zhang YW, Rosado E, Ravera S, Rhoades E, Forrest LR, Rudnick G. Two Na+ Sites Control Conformational Change in a Neurotransmitter Transporter Homolog*. Journal Of Biological Chemistry 2015, 291: 1456-1471. PMID: 26582198, PMCID: PMC4714228, DOI: 10.1074/jbc.m115.692012.Peer-Reviewed Original ResearchMeSH KeywordsAmino Acid SubstitutionAmino Acid Transport SystemsAquatic OrganismsBacterial ProteinsBinding SitesCysteineGram-Negative BacteriaLigandsLiposomesModels, MolecularMolecular Dynamics SimulationMutagenesis, Site-DirectedMutationPlasma Membrane Neurotransmitter Transport ProteinsProtein ConformationProtein FoldingProtein StabilityProteolipidsRecombinant ProteinsSodiumConceptsConformational changesTransmembrane helix 1Open conformational stateDependent conformational changesTransporter homologExtracellular gateProkaryotic homologCytoplasmic pathwayHelix 1Interaction networksIntermediary interactionsBiophysical assaysNeurotransmitter transportersSubstrate pathwayNa2 siteConformational statesHelix motionsLeuTDirect interactionDependent closureHomologMutantsDistinct stepsResiduesComputational analysis