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 ResearchConceptsCryo-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 ResearchConceptsArp2/3 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
2023
Discovery of the first unconventional myosin: Acanthamoeba myosin-I
Pollard T, Korn E. Discovery of the first unconventional myosin: Acanthamoeba myosin-I. Frontiers In Physiology 2023, 14: 1324623. PMID: 38046947, PMCID: PMC10693453, DOI: 10.3389/fphys.2023.1324623.Peer-Reviewed Original ResearchUnconventional myosinActin filamentsMyosin heavy chain kinaseFirst unconventional myosinsEvolution of eukaryotesClass I MyosinHeavy chain kinaseNovel unconventional myosinPhylogenetic analysisSlime moldMembrane lipidsChain kinaseProteolytic fragmentsHeavy chainMuscle myosinMyosinCofactorEnzymeMg-ATPaseMg-ATPase activityEukaryotesFilamentsCrude enzymeKinaseActin
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 ResearchConceptsATP 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
2015
Three Myosins Contribute Uniquely to the Assembly and Constriction of the Fission Yeast Cytokinetic Contractile Ring
Laplante C, Berro J, Karatekin E, Hernandez-Leyva A, Lee R, Pollard TD. Three Myosins Contribute Uniquely to the Assembly and Constriction of the Fission Yeast Cytokinetic Contractile Ring. Current Biology 2015, 25: 1955-1965. PMID: 26144970, PMCID: PMC4526439, DOI: 10.1016/j.cub.2015.06.018.Peer-Reviewed Original ResearchConceptsContractile ringActin filamentsHeavy chain geneMyosin IIContractile ring assemblyFission yeast cellsMyosin heavy chain geneCytokinetic contractile ringConventional myosin IICytokinetic nodesMyo2Myo51Myp2Ring assemblyYeast cellsMyosin functionCytokinesisDeletion mutationsComplete assemblyMyosin VConstriction rateGenesMutationsCellsFilaments
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 connectionsCellsYeastFungiMechanismMeshwork