Jeff Coleman, PhD
Research Associate Cell BiologyCards
About
Research
Publications
2025
Two successive oligomeric Munc13 assemblies scaffold vesicle docking and SNARE assembly to support neurotransmitter release
Bera M, Grushin K, Kalyana Sundaram R, Hinzen J, Chen J, Chatterjee A, Radhakrishnan A, Lee S, Padmanarayana M, Coleman J, Pincet F, Rothman J, Dittman J. Two successive oligomeric Munc13 assemblies scaffold vesicle docking and SNARE assembly to support neurotransmitter release. Nature Communications 2025, 16: 7222. PMID: 40764329, PMCID: PMC12325603, DOI: 10.1038/s41467-025-62420-7.Peer-Reviewed Original ResearchConceptsVesicle dockingSynaptic vesiclesPriming of synaptic vesiclesPresynaptic plasma membraneFusion in vitroTrans-SNARESNARE assemblyVesicle primingFunction in vivoMunc13Oligomeric assembliesHomo-oligomersInterface mutationsPlasma membraneNeurotransmitter secretionFunctional impactNeurotransmitter releaseVesiclesSnareIn vivoAssemblyIn vitroDockingMutationsSequenceHighly stable planar asymmetric suspended membranes for investigating protein dynamics and membrane fusion
Bera M, Kalyana Sundaram R, Coleman J, Chatterjee A, Thoduvayil S, Pincet F, Ramakrishnan S. Highly stable planar asymmetric suspended membranes for investigating protein dynamics and membrane fusion. Nature Protocols 2025, 1-25. PMID: 40461798, DOI: 10.1038/s41596-025-01192-2.Peer-Reviewed Original ResearchMembrane fusionSingle-vesicle fusion assayMembrane fusion eventsProtein dynamics analysisMembrane fusion mechanismFluorescently labeled proteinsProtein-lipid interactionsSNARE proteinsTotal internal reflection fluorescenceFusion eventsMolecular chaperonesInvestigate protein dynamicsTime-lapse imagingCellular signalingLipid asymmetryFusion assayBiological processesLipid membranesProtein dynamicsMembrane model systemsLiving cellsMembrane environmentNear-native environmentMolecular componentsReflection fluorescenceLithium fine tunes lipid membranes through phospholipid binding
Bunel L, Adrien V, Coleman J, Heo P, Pincet F. Lithium fine tunes lipid membranes through phospholipid binding. Scientific Reports 2025, 15: 13366. PMID: 40246965, PMCID: PMC12006515, DOI: 10.1038/s41598-025-97828-0.Peer-Reviewed Original ResearchConceptsUnrelated pathwaysBipolar disorderIntracellular traffickingPhospholipid bindingMembrane protein activityMembrane reorganizationProtein activityMolecular mechanismsLithium effectsModel membrane systemsLipid bilayerBindingDiverse effectsEffects of lithiumMembraneLipid membranesMembrane systemPhospholipid headgroupsOrganelles
2024
Quantitative single-molecule analysis of assembly and Ca2+-dependent disassembly of synaptotagmin oligomers on lipid bilayers
Li F, Coleman J, Redondo-Morata L, Kalyana Sundaram R, Stroeva E, Rothman J, Pincet F. Quantitative single-molecule analysis of assembly and Ca2+-dependent disassembly of synaptotagmin oligomers on lipid bilayers. Communications Biology 2024, 7: 1608. PMID: 39627539, PMCID: PMC11615320, DOI: 10.1038/s42003-024-07317-9.Peer-Reviewed Original ResearchConceptsSyt-1Lipid bilayerRing-like oligomersCa2+-evoked releaseSynaptotagmin-1Single-molecule imaging methodsSynaptic vesiclesBiochemical evidencePhysiological requirementsOligomerizationAnalysis of assembliesBilayerOligomersCa2+LipidAssemblyCa2Classes of oligomersMutationsVesiclesDisassemblyEvoked release
2023
Synaptophysin chaperones the assembly of 12 SNAREpins under each ready-release vesicle
Bera M, Radhakrishnan A, Coleman J, Sundaram R, Ramakrishnan S, Pincet F, Rothman J. Synaptophysin chaperones the assembly of 12 SNAREpins under each ready-release vesicle. Proceedings Of The National Academy Of Sciences Of The United States Of America 2023, 120: e2311484120. PMID: 37903271, PMCID: PMC10636311, DOI: 10.1073/pnas.2311484120.Peer-Reviewed Original ResearchConceptsSpecific molecular functionsSynaptic vesicle protein synaptophysinTarget membrane bilayerSensor synaptotagminSNARE proteinsMolecular functionsMembrane proteinsSNAREpinsReceptor vesiclesSingle-molecule measurementsGene knockoutMembrane bilayerLipid bilayersProtein synaptophysinVesiclesDetergent extractsHexamer structureSYPMechanism of actionProteinAssemblyChaperonesSynaptotagminExocytosisBilayersDiacylglycerol-dependent hexamers of the SNARE-assembling chaperone Munc13-1 cooperatively bind vesicles
Li F, Grushin K, Coleman J, Pincet F, Rothman J. Diacylglycerol-dependent hexamers of the SNARE-assembling chaperone Munc13-1 cooperatively bind vesicles. Proceedings Of The National Academy Of Sciences Of The United States Of America 2023, 120: e2306086120. PMID: 37883433, PMCID: PMC10623011, DOI: 10.1073/pnas.2306086120.Peer-Reviewed Original ResearchRoles for diacylglycerol in synaptic vesicle priming and release revealed by complete reconstitution of core protein machinery
Sundaram R, Chatterjee A, Bera M, Grushin K, Panda A, Li F, Coleman J, Lee S, Ramakrishnan S, Ernst A, Gupta K, Rothman J, Krishnakumar S. Roles for diacylglycerol in synaptic vesicle priming and release revealed by complete reconstitution of core protein machinery. Proceedings Of The National Academy Of Sciences Of The United States Of America 2023, 120: e2309516120. PMID: 37590407, PMCID: PMC10450444, DOI: 10.1073/pnas.2309516120.Peer-Reviewed Original ResearchConceptsCore protein machineryRelease-ready vesiclesSynaptic vesicle primingVesicle primingProtein machinerySingle-molecule imagingSNAREpin assemblyFunctional intermediatesFunctional reconstitutionMunc13DiacylglycerolCoordinated actionMunc18VesiclesMachineryComplete reconstitutionNew roleSelective effectDetailed characterizationChaperonesRate of caReconstitutionVAMP2ComplexinMutationsRapid Quantification of First and Second Phase Insulin Secretion Dynamics using an In vitro Platform for Improving Insulin Therapy
Thoduvayil S, Weerakkody J, Sundaram R, Topper M, Bera M, Coleman J, Li X, Mariappan M, Ramakrishnan S. Rapid Quantification of First and Second Phase Insulin Secretion Dynamics using an In vitro Platform for Improving Insulin Therapy. Cell Calcium 2023, 113: 102766. PMID: 37295201, PMCID: PMC10450995, DOI: 10.1016/j.ceca.2023.102766.Peer-Reviewed Original ResearchConceptsCellular pathwaysSecretion dynamicsSmall molecule screeningLuciferase reporter systemInsulin secretion dynamicsHigh-throughput compoundInsulin secretionHigh-throughput quantificationReporter systemGenetic studiesLive cellsDistinct rolesInsulin therapyGlucose-stimulated insulin secretionSmall moleculesEffective insulin therapyPathwaySecretionDirect determination of oligomeric organization of integral membrane proteins and lipids from intact customizable bilayer
Panda A, Giska F, Duncan A, Welch A, Brown C, McAllister R, Hariharan P, Goder J, Coleman J, Ramakrishnan S, Pincet F, Guan L, Krishnakumar S, Rothman J, Gupta K. Direct determination of oligomeric organization of integral membrane proteins and lipids from intact customizable bilayer. Nature Methods 2023, 20: 891-897. PMID: 37106230, PMCID: PMC10932606, DOI: 10.1038/s41592-023-01864-5.Peer-Reviewed Original ResearchConceptsIntegral membrane proteinsMembrane proteinsOligomeric organizationOligomeric stateNative mass spectrometry analysisFunctional oligomeric stateKey membrane componentMass spectrometry analysisNMS analysisTarget membraneLipid bindingMembrane componentsProteolipid vesiclesMembrane compositionLipid compositionSpectrometry analysisLipid membranesNeurotransmitter releaseProteinMembraneLipidsMembrane propertiesDirect determinationBilayersTransporters
2022
Native Planar Asymmetric Suspended Membrane for Single‐Molecule Investigations: Plasma Membrane on a Chip (Small 51/2022)
Sundaram R, Bera M, Coleman J, Weerakkody J, Krishnakumar S, Ramakrishnan S. Native Planar Asymmetric Suspended Membrane for Single‐Molecule Investigations: Plasma Membrane on a Chip (Small 51/2022). Small 2022, 18 DOI: 10.1002/smll.202270277.Peer-Reviewed Original ResearchGiant plasma membrane vesiclesTotal internal reflection fluorescence microscopyMembrane protein assemblyPlasma membrane vesiclesReflection fluorescence microscopyDifferent cell typesSingle-molecule investigationsProtein functionProtein assembliesInner leafletPlasma membraneMembrane vesiclesCell typesLipid architectureFluorescence microscopyLipid membranesMolecule investigationsMembraneSilicon-based platformVesiclesAssemblyCellsBilayersLeaflets