2023
Oligomeric organization of membrane proteins from native membranes at nanoscale spatial and single-molecule resolution
Walker G, Brown C, Ge X, Kumar S, Muzumdar M, Gupta K, Bhattacharyya M. Oligomeric organization of membrane proteins from native membranes at nanoscale spatial and single-molecule resolution. Nature Nanotechnology 2023, 19: 85-94. PMID: 38012273, PMCID: PMC10981947, DOI: 10.1038/s41565-023-01547-4.Peer-Reviewed Original ResearchMembrane proteinsNative membranesOligomeric organizationDiverse membrane proteinsMembrane protein biologyNative cell membranesTarget membrane proteinsNative membrane environmentSingle-molecule resolutionSingle-molecule platformReceptor tyrosine kinasesOligomeric distributionNative nanodiscsOligomerization statusProtein biologySmall GTPaseGrowth factor bindingMembrane environmentOligomeric assembliesTyrosine kinaseCritical regulatorOncogenic mutationsCell membraneProteinMembraneStudying Membrane Protein–Lipid Specificity through Direct Native Mass Spectrometric Analysis from Tunable Proteoliposomes
Panda A, Brown C, Gupta K. Studying Membrane Protein–Lipid Specificity through Direct Native Mass Spectrometric Analysis from Tunable Proteoliposomes. Journal Of The American Society For Mass Spectrometry 2023, 34: 1917-1927. PMID: 37432128, PMCID: PMC10932607, DOI: 10.1021/jasms.3c00110.Peer-Reviewed Original ResearchConceptsIntegral membrane proteinsMembrane proteinsNative mass spectrometryTrafficking pathwaysPlasma membraneEukaryotic integral membrane proteinsEndoplasmic reticulumBiophysical propertiesMembrane protein assemblySynaptic vesiclesCellular trafficking pathwaysOrganellar membranesLipid specificityTransmembrane proteinProtein assembliesMembrane contextMass spectrometric analysisProteinNative mass spectrometric analysesVAMP2Lipid compositionExogenous ligandsLipid membranesIndividual lipidsMembraneATG9 vesicles comprise the seed membrane of mammalian autophagosomes
Olivas T, Wu Y, Yu S, Luan L, Choi P, Guinn E, Nag S, De Camilli P, Gupta K, Melia T. ATG9 vesicles comprise the seed membrane of mammalian autophagosomes. Journal Of Cell Biology 2023, 222: e202208088. PMID: 37115958, PMCID: PMC10148236, DOI: 10.1083/jcb.202208088.Peer-Reviewed Original ResearchConceptsAtg9 vesiclesMammalian autophagosomesStyrene maleic acid lipid particlesLipid scramblase activityLC3-IIAutophagosomes formAutophagosome membraneMature autophagosomesScramblase activityAutophagosome formationAtg9Lipid transportMembrane growthAutophagosomesNanoscale organizationProtein-mediated transferProteinMembrane surface areaOrganellesVesiclesSeed membraneMembraneLipid particlesLipidsDifferent stagesDirect 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
Mitoguardin-2–mediated lipid transfer preserves mitochondrial morphology and lipid droplet formation
Hong Z, Adlakha J, Wan N, Guinn E, Giska F, Gupta K, Melia TJ, Reinisch KM. Mitoguardin-2–mediated lipid transfer preserves mitochondrial morphology and lipid droplet formation. Journal Of Cell Biology 2022, 221: e202207022. PMID: 36282247, PMCID: PMC9597353, DOI: 10.1083/jcb.202207022.Peer-Reviewed Original ResearchConceptsEndoplasmic reticulumLipid dropletsProtein-mediated transferLipid transport proteinsLipid droplet formationLD biologyMitochondrial proteinsSecretory pathwayMass spectrometry analysisTerminal domainMitochondrial morphologyTransport proteinsLipid transportersCellular membranesLD metabolismMembrane contactX-ray structureSpectrometry analysisOrganellesGlycerophospholipidsProteinHydrophobic cavityFatty acidsLipidsMembrane