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
2008
Involvement of serotonin transporter extracellular loop 1 in serotonin binding and transport
Mao Y, Mao Y, Mathewson L, Mao Y, Mathewson L, Gesmonde J, Sato Y, Mao Y, Mathewson L, Gesmonde J, Sato Y, Holy M, Sitte H, Rudnick G. Involvement of serotonin transporter extracellular loop 1 in serotonin binding and transport. Molecular Membrane Biology 2008, 25: 115-127. PMID: 18307099, PMCID: PMC4510095, DOI: 10.1080/09687680701633257.Peer-Reviewed Original ResearchMeSH KeywordsAmino Acid SequenceAnimalsBiological TransportCell MembraneHeLa CellsHumansIndicators and ReagentsKineticsLigandsMesylatesMolecular Sequence DataMutant ProteinsProtein Structure, TertiaryRatsSequence DeletionSerotoninSerotonin Plasma Membrane Transport ProteinsStructure-Activity Relationship
2000
Functional Role of Critical Stripe Residues in Transmembrane Span 7 of the Serotonin Transporter EFFECTS OF Na+, Li+, AND METHANETHIOSULFONATE REAGENTS*
Kamdar G, Penado K, Rudnick G, Stephan M. Functional Role of Critical Stripe Residues in Transmembrane Span 7 of the Serotonin Transporter EFFECTS OF Na+, Li+, AND METHANETHIOSULFONATE REAGENTS*. Journal Of Biological Chemistry 2000, 276: 4038-4045. PMID: 11058600, DOI: 10.1074/jbc.m008483200.Peer-Reviewed Original ResearchConceptsCys-109Methanethiosulfonate reagentsWater-filled poresNative cysteine residuesCysteine-containing mutantsExtracellular loop 1Close-contact regionThree-dimensional structureCysteine residuesTranslocation mechanismControl mutantsAlpha-helixMTSEA-biotinResidue positionsCysteine substitutionsLoop 1Conformational changesMTS reagentsFunctional roleMutantsIon bindingResiduesTransportersIon dependenceSerotonin transporter
1998
[16] Ion-coupled neurotransmitter transport: Thermodynamic vs. kinetic determinations of stoichiometry
Rudnick G. [16] Ion-coupled neurotransmitter transport: Thermodynamic vs. kinetic determinations of stoichiometry. Methods In Enzymology 1998, 296: 233-247. PMID: 9779452, DOI: 10.1016/s0076-6879(98)96018-9.Peer-Reviewed Reviews, Practice Guidelines, Standards, and Consensus StatementsConceptsNumber of ionsKinetic determinationMolecular machinesCharge movesIonsLipid bilayersNeurotransmitter moleculesMoleculesInput of energySteady-state distributionLow concentrationsChargeElectrical potentialMembraneIon gradientsStoichiometryHigh concentrationsUltimate concentrationNaConcentrationEnergyBilayersNeurotransmitter transportersNumber of NaNeurotransmitter transport
1997
The Third Transmembrane Domain of the Serotonin Transporter Contains Residues Associated with Substrate and Cocaine Binding*
Chen J, Sachpatzidis A, Rudnick G. The Third Transmembrane Domain of the Serotonin Transporter Contains Residues Associated with Substrate and Cocaine Binding*. Journal Of Biological Chemistry 1997, 272: 28321-28327. PMID: 9353288, DOI: 10.1074/jbc.272.45.28321.Peer-Reviewed Original ResearchAsparagineBinding SitesCarrier ProteinsCell LineCell MembraneCocaineCysteineEthyl MethanesulfonateHumansIndicators and ReagentsIsoleucineLigandsMembrane GlycoproteinsMembrane Transport ProteinsMesylatesMutagenesis, Site-DirectedNerve Tissue ProteinsProtein Structure, SecondarySerotoninSerotonin Plasma Membrane Transport ProteinsStructure-Activity RelationshipTyrosinePlacental biogenic amine transporters: cloning and expression
Padbury J, Tseng Y, McGonnigal B, Penado K, Stephan M, Rudnick G. Placental biogenic amine transporters: cloning and expression. Brain Research 1997, 45: 163-168. PMID: 9105686, DOI: 10.1016/s0169-328x(96)00309-9.Peer-Reviewed Original ResearchMeSH KeywordsAmino Acid SequenceAnimalsBase SequenceBrainCarrier ProteinsCell MembraneCloning, MolecularFemaleHumansMembrane GlycoproteinsMembrane Transport ProteinsMolecular Sequence DataNerve Tissue ProteinsNeuronsPlacentaPregnancyProtein BiosynthesisRecombinant ProteinsSequence Homology, Amino AcidSequence Homology, Nucleic AcidSerotoninSerotonin Plasma Membrane Transport ProteinsSheep
1996
Cell-specific Sorting of Biogenic Amine Transporters Expressed in Epithelial Cells*
Gu H, Ahn J, Caplan M, Blakely R, Levey A, Rudnick G. Cell-specific Sorting of Biogenic Amine Transporters Expressed in Epithelial Cells*. Journal Of Biological Chemistry 1996, 271: 18100-18106. PMID: 8663573, DOI: 10.1074/jbc.271.30.18100.Peer-Reviewed Original ResearchMeSH KeywordsAnimalsBiogenic AminesBiological TransportCarrier ProteinsCell CompartmentationCell MembraneCell PolarityCells, CulturedDogsDopamineDopamine Plasma Membrane Transport ProteinsEpithelial CellsHumansImmunohistochemistryMembrane GlycoproteinsMembrane Transport ProteinsNerve Tissue ProteinsNorepinephrineNorepinephrine Plasma Membrane Transport ProteinsRatsRecombinant ProteinsSerotoninSerotonin Plasma Membrane Transport ProteinsSymportersConceptsMadin-Darby canine kidneyMDCK cellsLLC-PK1 cellsNeurotransmitter transportersCell surface biotinylationConfocal immunofluorescence microscopyBasolateral membraneCell-specific mechanismsEpithelial cellsBiogenic amine transportersMembrane proteinsSurface biotinylationCDNA encodingHuman DA transporterAmine transportersImmunofluorescence microscopyBiotinylating reagentTransportersPermeable filter supportsApical surfaceImmunocytochemistry resultsBasolateral mediumSurface expressionApical sideDA transporterIon Coupling Stoichiometry for the Norepinephrine Transporter in Membrane Vesicles from Stably Transfected Cells (∗)
Gu H, Wall S, Rudnick G. Ion Coupling Stoichiometry for the Norepinephrine Transporter in Membrane Vesicles from Stably Transfected Cells (∗). Journal Of Biological Chemistry 1996, 271: 6911-6916. PMID: 8636118, DOI: 10.1074/jbc.271.12.6911.Peer-Reviewed Original ResearchConceptsMembrane vesiclesTransmembrane ion gradientsLLC-PK1 cellsMajor substrateTransport substratesTransfected CellsStably Transfected CellsIon gradientsCoupling stoichiometryNet positive chargeDA accumulationVesiclesSubstrate moleculesTransportersNorepinephrine transporterAccumulationCellsGamma-aminobutyric acidCotransportDAGradientStoichiometrySubstrateAbsenceTransport processes
1995
Biogenic amine flux mediated by cloned transporters stably expressed in cultured cell lines: amphetamine specificity for inhibition and efflux.
Wall S, Gu H, Rudnick G. Biogenic amine flux mediated by cloned transporters stably expressed in cultured cell lines: amphetamine specificity for inhibition and efflux. Molecular Pharmacology 1995, 47: 544-50. PMID: 7700252.Peer-Reviewed Original ResearchMeSH Keywords1-Methyl-4-phenylpyridiniumAmphetaminesBiogenic MonoaminesBiological TransportCarrier ProteinsCell MembraneCells, CulturedCloning, MolecularCocaineDNA, ComplementaryDopamineDopamine Plasma Membrane Transport ProteinsHumansMazindolMembrane GlycoproteinsMembrane Transport ProteinsNerve Tissue ProteinsNeurotransmitter Uptake InhibitorsNorepinephrineNorepinephrine Plasma Membrane Transport ProteinsSerotoninSerotonin Plasma Membrane Transport ProteinsStimulation, ChemicalSubstrate SpecificitySymportersTransfectionConceptsBiogenic amine transportersCell linesAmine transportersRat serotonin transporterCultured cell linesInhibitor of transportRat dopamine transporterHuman norepinephrine transporterPlasma membraneLLC-PK1 cellsSubstrate effluxSubstrate influxDopamine transporterNorepinephrine transporterAmphetamine derivativesTransportersSerotonin transporterEffluxDistinct patternsP-chloroamphetamineAmine substratesCellsInhibited transportCDNAInhibitors
1993
Amphetamine derivatives interact with both plasma membrane and secretory vesicle biogenic amine transporters.
Schuldiner S, Steiner-Mordoch S, Yelin R, Wall S, Rudnick G. Amphetamine derivatives interact with both plasma membrane and secretory vesicle biogenic amine transporters. Molecular Pharmacology 1993, 44: 1227-31. PMID: 7903417.Peer-Reviewed Original ResearchMeSH Keywords3,4-MethylenedioxyamphetamineAnimalsBlood PlateletsCarrier ProteinsCattleCell MembraneChromaffin GranulesFenfluramineHumansIn Vitro TechniquesMembrane GlycoproteinsMembrane Transport ProteinsNerve Tissue ProteinsN-Methyl-3,4-methylenedioxyamphetamineP-ChloroamphetamineReserpineSerotoninSerotonin Plasma Membrane Transport ProteinsConceptsVesicular amine transporterVesicular amine transportAmine transportersAmine transportSerotonin transportChromaffin granule membrane vesiclesPlasma membrane transportersBiogenic amine transportersPlasma membraneMembrane transportersMembrane vesiclesSubstrate siteVesicular transportersTransportersDelta pHNon-neurotoxic amphetamine derivatives release serotonin through serotonin transporters.
Rudnick G, Wall S. Non-neurotoxic amphetamine derivatives release serotonin through serotonin transporters. Molecular Pharmacology 1993, 43: 271-6. PMID: 8429828.Peer-Reviewed Original ResearchMeSH KeywordsAmphetaminesBlood PlateletsCarrier ProteinsCell MembraneChromaffin GranulesHumansImipramineIn Vitro TechniquesIndansMembrane GlycoproteinsMembrane Transport ProteinsMethamphetamineModels, BiologicalNerve EndingsNerve Tissue ProteinsRadioligand AssaySerotoninSerotonin Plasma Membrane Transport ProteinsConceptsChromaffin granule membrane vesiclesPlasma membrane vesiclesMembrane vesiclesPlatelet plasma membrane vesiclesPlasma membrane transportersSerotonin transportBiogenic amine transportersMembrane transportersAmine transportersTransportersVesiclesDopamine transporterSerotonin transporterModel systemHalf-maximal concentrationNerve terminalsTransmembraneCocaine analogBindingSimilar concentrationsHigh concentrationsCellsTransport
1992
p-Chloroamphetamine induces serotonin release through serotonin transporters.
Rudnick G, Wall S. p-Chloroamphetamine induces serotonin release through serotonin transporters. Biochemistry 1992, 31: 6710-8. PMID: 1322169, DOI: 10.1021/bi00144a010.Peer-Reviewed Original ResearchMeSH KeywordsBinding, CompetitiveBiological TransportBlood PlateletsCarrier ProteinsCell MembraneChloridesHumansHydrogen-Ion ConcentrationImipramineKineticsLithiumLithium ChlorideMembrane GlycoproteinsMembrane Transport ProteinsNerve Tissue ProteinsP-ChloroamphetamineRadioisotope Dilution TechniqueSerotoninSerotonin Plasma Membrane Transport ProteinsTritiumConceptsPlasma membrane vesiclesMembrane vesiclesChromaffin granule membrane vesiclesVesicular amine transporterATP hydrolysisBovine adrenal chromaffin granulesSerotonin transporterAdrenal chromaffin granulesPrevents accumulationAmine transportersPresence of Mg2TransportersVesiclesChromaffin granulesModel systemDelta pHHuman plateletsATPEffluxManner characteristicAccumulationTransmembraneNaCl gradientPCA's abilityP-chloroamphetamineThe molecular mechanism of "ecstasy" [3,4-methylenedioxy-methamphetamine (MDMA)]: serotonin transporters are targets for MDMA-induced serotonin release.
Rudnick G, Wall S. The molecular mechanism of "ecstasy" [3,4-methylenedioxy-methamphetamine (MDMA)]: serotonin transporters are targets for MDMA-induced serotonin release. Proceedings Of The National Academy Of Sciences Of The United States Of America 1992, 89: 1817-1821. PMID: 1347426, PMCID: PMC48544, DOI: 10.1073/pnas.89.5.1817.Peer-Reviewed Original ResearchConceptsPlasma membrane vesiclesMembrane vesiclesAmine transportersVesicular amine transporterBiogenic amine transportersSecretory vesiclesPlasma membraneATP hydrolysisMolecular mechanismsBovine adrenal chromaffin granulesSerotonin transporterAdrenal chromaffin granulesTransportersDirect interactionVesiclesChromaffin granulesHuman plateletsManner characteristicEffluxTransmembraneATPMDMA actionMechanismBindingMembranePlatelet serotonin transporter
Rudnick G, Humphreys C. Platelet serotonin transporter. Methods In Enzymology 1992, 215: 213-224. PMID: 1435323, DOI: 10.1016/0076-6879(92)15065-k.Peer-Reviewed Reviews, Practice Guidelines, Standards, and Consensus StatementsAdenosine TriphosphateAnimalsBiological TransportBlood PlateletsCarrier ProteinsCell FractionationCell MembraneCell SeparationCentrifugationHumansImipramineIndicators and ReagentsMembrane GlycoproteinsMembrane Transport ProteinsNerve Tissue ProteinsRadioligand AssaySerotoninSerotonin Plasma Membrane Transport ProteinsSwineTritium
1991
Vaccinia-T7 RNA polymerase expression system: Evaluation for the expression cloning of plasma membrane transporters
Blakely R, Clark J, Rudnick G, Amara S. Vaccinia-T7 RNA polymerase expression system: Evaluation for the expression cloning of plasma membrane transporters. Analytical Biochemistry 1991, 194: 302-308. PMID: 1862934, DOI: 10.1016/0003-2697(91)90233-j.Peer-Reviewed Original ResearchSubstrate and inhibitor binding and translocation by the platelet plasma membrane serotonin transporter
Humphreys C, Beidler D, Rudnick G. Substrate and inhibitor binding and translocation by the platelet plasma membrane serotonin transporter. Biochemical Society Transactions 1991, 19: 95-98. PMID: 2037207, DOI: 10.1042/bst0190095.Peer-Reviewed Original Research
1989
2-Iodoimipramine, a novel ligand for the serotonin transporter.
Humphreys C, Cassel D, Rudnick G. 2-Iodoimipramine, a novel ligand for the serotonin transporter. Molecular Pharmacology 1989, 36: 620-6. PMID: 2811859.Peer-Reviewed Original ResearchZwitterionic and Anionic Forms of a Serotonin Analog as Transport Substrates
Rudnick G, Kirk K, Fishkes H, Schuldiner S. Zwitterionic and Anionic Forms of a Serotonin Analog as Transport Substrates. Journal Of Biological Chemistry 1989, 264: 14865-14868. PMID: 2549040, DOI: 10.1016/s0021-9258(18)63781-0.Peer-Reviewed Original ResearchConceptsBiogenic amine transportersAmine transportersPlasma membrane serotonin transporterSubstrate translocationBovine chromaffin granulesTransport substratesHuman blood plateletsSerotonin transportChromaffin granulesTransportersBlood plateletsSerotonin transporterKmIdentical ratesTranslocationSubstrateTransport
1985
Serotonin Transport by Platelet Plasma and Granule Membranes
RUDNICK G, HUMPHREYS C, DEAN G. Serotonin Transport by Platelet Plasma and Granule Membranes. Annals Of The New York Academy Of Sciences 1985, 456: 277-278. PMID: 2418730, DOI: 10.1111/j.1749-6632.1985.tb14876.x.Peer-Reviewed Reviews, Practice Guidelines, Standards, and Consensus Statements
1983
The serotonin transporter-imipramine "receptor".
Talvenheimo J, Fishkes H, Nelson P, Rudnick G. The serotonin transporter-imipramine "receptor". Journal Of Biological Chemistry 1983, 258: 6115-6119. PMID: 6853478, DOI: 10.1016/s0021-9258(18)32380-9.Peer-Reviewed Original Research