2019
Structural basis for the clamping and Ca2+ activation of SNARE-mediated fusion by synaptotagmin
Grushin K, Wang J, Coleman J, Rothman JE, Sindelar CV, Krishnakumar SS. Structural basis for the clamping and Ca2+ activation of SNARE-mediated fusion by synaptotagmin. Nature Communications 2019, 10: 2413. PMID: 31160571, PMCID: PMC6546687, DOI: 10.1038/s41467-019-10391-x.Peer-Reviewed Original ResearchConceptsCryo-electron microscopy structureActivation of SNAREsDependent membrane interactionsAnionic lipid headgroupsFusion clampActivator functionSNARE bundleSNARE proteinsMicroscopy structureC2B domainStructural basisSynaptotagmin-1SNAREpinsAliphatic loopsMembrane interactionsComplete assemblyLipid headgroupsLipid membranesNeurotransmitter releaseMembraneKey determinantSynaptotagminSyt1Calcium influxPartial insertion
2017
Kv1.1 channelopathy abolishes presynaptic spike width modulation by subthreshold somatic depolarization
Vivekananda U, Novak P, Bello OD, Korchev YE, Krishnakumar SS, Volynski KE, Kullmann DM. Kv1.1 channelopathy abolishes presynaptic spike width modulation by subthreshold somatic depolarization. Proceedings Of The National Academy Of Sciences Of The United States Of America 2017, 114: 2395-2400. PMID: 28193892, PMCID: PMC5338558, DOI: 10.1073/pnas.1608763114.Peer-Reviewed Original ResearchConceptsSomatic depolarizationPotassium channelsAction potentialsPresynaptic potassium channelsPrimary hippocampal culturesSubthreshold membrane potential fluctuationsHeterozygous mouse modelEpisodic ataxia type 1Distinct potassium channelsSubthreshold modulationAxon transectionSmall boutonsCalcium influxHippocampal culturesMouse modelSynaptic boutonsKv1.1 subunitsMembrane potential fluctuationsNeurotransmitter releaseIntact axonsType 1Genetic deletionAtaxia type 1Further prolongationPresynaptic spikes
2014
Calcium sensitive ring-like oligomers formed by synaptotagmin
Wang J, Bello O, Auclair SM, Wang J, Coleman J, Pincet F, Krishnakumar SS, Sindelar CV, Rothman JE. Calcium sensitive ring-like oligomers formed by synaptotagmin. Proceedings Of The National Academy Of Sciences Of The United States Of America 2014, 111: 13966-13971. PMID: 25201968, PMCID: PMC4183308, DOI: 10.1073/pnas.1415849111.Peer-Reviewed Original ResearchConceptsSynaptic vesicle protein Synaptotagmin 1Cytosolic domainSoluble N-ethylmaleimide-sensitive factorN-ethylmaleimide-sensitive factorMembrane fusion machineryReceptor complex assemblyRing-like oligomersFusion machineryC2 domainComplex assemblySynaptotagmin-1Helical reconstructionFusion proceedsNovel mechanismStructural mechanismsLipid monolayersNeurotransmitter releaseAbsence of calciumPhysiological concentrationsRing formationPresence of calciumFree calcium ionsSynaptotagminCalcium influxCircular arrangement