2024
Mechanism of phosphate release from actin filaments
Wang Y, Wu J, Zsolnay V, Pollard T, Voth G. Mechanism of phosphate release from actin filaments. Proceedings Of The National Academy Of Sciences Of The United States Of America 2024, 121: e2408156121. PMID: 38980907, PMCID: PMC11260136, DOI: 10.1073/pnas.2408156121.Peer-Reviewed Original ResearchMeSH KeywordsActin CytoskeletonActinsAdenosine TriphosphateCryoelectron MicroscopyHydrogen BondingMagnesiumMolecular Dynamics SimulationPhosphatesConceptsCryo-EM structureAll-atom molecular dynamics simulationsATP-actinRate of phosphate releaseActin filamentsMechanism of phosphate releaseMolecular dynamics simulationsPhosphate releaseDissociation of phosphateR177Salt bridgesHydrogen bondsEnergy barrierDynamics simulationsComputational studyRelease of phosphateFilamentsRelease pathwayInternal cavityResiduesStudy residuesOccluding interactionsGatePrimary eventD179Cryo-EM structures reveal how phosphate release from Arp3 weakens actin filament branches formed by Arp2/3 complex
Chavali S, Chou S, Cao W, Pollard T, De La Cruz E, Sindelar C. Cryo-EM structures reveal how phosphate release from Arp3 weakens actin filament branches formed by Arp2/3 complex. Nature Communications 2024, 15: 2059. PMID: 38448439, PMCID: PMC10918085, DOI: 10.1038/s41467-024-46179-x.Peer-Reviewed Original ResearchMeSH KeywordsActin CytoskeletonActin-Related Protein 2-3 ComplexActinsCryoelectron MicroscopyCytoskeletonPhosphatesConceptsArp2/3 complexActin filamentsCryo-EM structureMother filamentDaughter filamentArp2/3 complex nucleates branched actin filamentsActin filament branchingBranched actin filamentsDissociation of PiADP-PiFilament branchingOrganelle movementADP stateBranch junctionsArp3A-resolutionActinArp2/3ADP-BeFxFilamentsADPPhosphate releaseFilament mechanismArp2Organelles
2019
Mechanism of actin polymerization revealed by cryo-EM structures of actin filaments with three different bound nucleotides
Chou SZ, Pollard TD. Mechanism of actin polymerization revealed by cryo-EM structures of actin filaments with three different bound nucleotides. Proceedings Of The National Academy Of Sciences Of The United States Of America 2019, 116: 4265-4274. PMID: 30760599, PMCID: PMC6410863, DOI: 10.1073/pnas.1807028115.Peer-Reviewed Original ResearchMeSH KeywordsActin CytoskeletonActinsAdenylyl ImidodiphosphateAnimalsAvian ProteinsCatalytic DomainChickensCryoelectron MicroscopyPolymerizationConceptsATP hydrolysisActin filamentsBarbed endsMultiple favorable interactionsCryo-electron microscopyNetwork of interactionsShort-pitch helixActin polymerizationC-terminusAdjacent subunitsSubdomain 2Conformational changesEM structuresBinding loopSubdomain 3SubunitsPhosphate dissociationPointed endRelease sitesFilamentsActive siteConformationADPBackbone conformationSide chains
2018
Conformational changes in Arp2/3 complex induced by ATP, WASp-VCA, and actin filaments
Espinoza-Sanchez S, Metskas LA, Chou SZ, Rhoades E, Pollard TD. Conformational changes in Arp2/3 complex induced by ATP, WASp-VCA, and actin filaments. Proceedings Of The National Academy Of Sciences Of The United States Of America 2018, 115: e8642-e8651. PMID: 30150414, PMCID: PMC6140485, DOI: 10.1073/pnas.1717594115.Peer-Reviewed Original Research
2016
Molecular organization of cytokinesis nodes and contractile rings by super-resolution fluorescence microscopy of live fission yeast
Laplante C, Huang F, Tebbs IR, Bewersdorf J, Pollard TD. Molecular organization of cytokinesis nodes and contractile rings by super-resolution fluorescence microscopy of live fission yeast. Proceedings Of The National Academy Of Sciences Of The United States Of America 2016, 113: e5876-e5885. PMID: 27647921, PMCID: PMC5056082, DOI: 10.1073/pnas.1608252113.Peer-Reviewed Original ResearchConceptsFluorescence photoactivation localization microscopyContractile ringLive fission yeast cellsLive fission yeastFission yeast cellsCytokinetic contractile ringSuper-resolution fluorescence microscopyCytokinesis nodesPhotoactivation localization microscopyFission yeastFormin Cdc12pActin networkIQ motifPlasma membraneCytokinesisConstituent proteinsMyosin-II tailYeast cellsActin ringsActin strandsAssembly precursorsDiscrete structural unitsFluorescence microscopyMolecular organizationProteinAvoiding artefacts when counting polymerized actin in live cells with LifeAct fused to fluorescent proteins
Courtemanche N, Pollard TD, Chen Q. Avoiding artefacts when counting polymerized actin in live cells with LifeAct fused to fluorescent proteins. Nature Cell Biology 2016, 18: 676-683. PMID: 27159499, PMCID: PMC5509211, DOI: 10.1038/ncb3351.Peer-Reviewed Original Research
2014
Local and global analysis of endocytic patch dynamics in fission yeast using a new “temporal superresolution” realignment method
Berro J, Pollard TD. Local and global analysis of endocytic patch dynamics in fission yeast using a new “temporal superresolution” realignment method. Molecular Biology Of The Cell 2014, 25: 3501-3514. PMID: 25143395, PMCID: PMC4230612, DOI: 10.1091/mbc.e13-01-0004.Peer-Reviewed Original ResearchConceptsFission yeastEndocytic actin patchesWild-type cellsEndocytic patchesActin patchesQuantitative microscopyActin assemblyCellular processesVesicle movementEndocytic vesiclesInterphase cellsVesicle formationMolecular mechanismsPatch dynamicsYeastCell lengthGlobal analysisNumber of patchesMicroscopy moviesCellsClathrinEndocytosisNew toolValuable toolPatchesMechanism of Cytokinetic Contractile Ring Constriction in Fission Yeast
Stachowiak MR, Laplante C, Chin HF, Guirao B, Karatekin E, Pollard TD, O’Shaughnessy B. Mechanism of Cytokinetic Contractile Ring Constriction in Fission Yeast. Developmental Cell 2014, 29: 547-561. PMID: 24914559, PMCID: PMC4137230, DOI: 10.1016/j.devcel.2014.04.021.Peer-Reviewed Original ResearchMeSH KeywordsActin CytoskeletonActomyosinComputer SimulationCytokinesisMyosin Type IIPolymerizationSchizosaccharomycesSchizosaccharomyces pombe Proteins
2013
Actin Filament Severing by Cofilin Dismantles Actin Patches and Produces Mother Filaments for New Patches
Chen Q, Pollard TD. Actin Filament Severing by Cofilin Dismantles Actin Patches and Produces Mother Filaments for New Patches. Current Biology 2013, 23: 1154-1162. PMID: 23727096, PMCID: PMC4131202, DOI: 10.1016/j.cub.2013.05.005.Peer-Reviewed Original ResearchConceptsSites of endocytosisActin patchesWild-type cellsArp2/3 complexMother filamentActin filamentsAdaptor proteinActin polymerizationYeast cellsBranched actin filament networksEndocytic adaptor proteinActivators of Arp2/3Fission yeast cellsActin filament severingActin filament networkNew patchesEndocytic sitesQuantitative fluorescence microscopyMutant cofilinsMutant cellsNascent sitesFilament severingCofilinFilament networkEndocytosis
2007
Assembly Mechanism of the Contractile Ring for Cytokinesis by Fission Yeast
Vavylonis D, Wu JQ, Hao S, O'Shaughnessy B, Pollard TD. Assembly Mechanism of the Contractile Ring for Cytokinesis by Fission Yeast. Science 2007, 319: 97-100. PMID: 18079366, DOI: 10.1126/science.1151086.Peer-Reviewed Original ResearchConceptsContractile ringActin filamentsLive fission yeast cellsIndividual daughter cellsFission yeast cellsDynamic actin filamentsFission yeastMotor protein myosinCell equatorDaughter cellsYeast cellsAssembly mechanismProtein myosinFluorescence microscopyCytokinesisMyosinFilamentsTransient connectionsCellsYeastFungiMechanismMeshworkInsights into the Influence of Nucleotides on Actin Family Proteins from Seven Structures of Arp2/3 Complex
Nolen BJ, Pollard TD. Insights into the Influence of Nucleotides on Actin Family Proteins from Seven Structures of Arp2/3 Complex. Molecular Cell 2007, 26: 449-457. PMID: 17499050, PMCID: PMC1997283, DOI: 10.1016/j.molcel.2007.04.017.Peer-Reviewed Original ResearchMeSH KeywordsActin CytoskeletonActin-Related Protein 2-3 ComplexActinsAdenosine DiphosphateAdenosine TriphosphatasesAdenosine TriphosphateAnimalsBinding SitesCattleCross-Linking ReagentsGlutaralHumansKineticsMacromolecular SubstancesModels, MolecularNucleotidesProtein ConformationProtein Interaction MappingProtein Structure, TertiaryConceptsArp2/3 complexATP bindingSubdomain 1Actin-family proteinsConformational changesLarge-scale conformational changesActin filament branchesNetwork of interactionsInfluence of nucleotidesActin familyFamily proteinsActin structuresFilament branchesIntrinsic disorderArp3ATPase cycleSteric clashesArp2/3Arp2NucleotidesResiduesComplexesBindingAdenine nucleotidesNew electron density