Journal: Structure / Year: 2019 Title: The Architecture of Traveling Actin Waves Revealed by Cryo-Electron Tomography. Authors: Marion Jasnin / Florian Beck / Mary Ecke / Yoshiyuki Fukuda / Antonio Martinez-Sanchez / Wolfgang Baumeister / Günther Gerisch / Abstract: Actin waves are dynamic supramolecular structures involved in cell migration, cytokinesis, adhesion, and neurogenesis. Although wave-like propagation of actin networks is a widespread phenomenon, the ...Actin waves are dynamic supramolecular structures involved in cell migration, cytokinesis, adhesion, and neurogenesis. Although wave-like propagation of actin networks is a widespread phenomenon, the actin architecture underlying wave propagation remained unknown. In situ cryo-electron tomography of Dictyostelium cells unveils the wave architecture and provides evidence for wave progression by de novo actin nucleation. Subtomogram averaging reveals the structure of Arp2/3 complex-mediated branch junctions in their native state, and enables quantitative analysis of the 3D organization of branching within the waves. We find an excess of branches directed toward the substrate-attached membrane, and tent-like structures at sites of branch clustering. Fluorescence imaging shows that Arp2/3 clusters follow accumulation of the elongation factor VASP. We propose that filament growth toward the membrane lifts up the actin network as the wave propagates, until depolymerization of oblique filaments at the back causes the collapse of horizontal filaments into a compact layer.
History
Deposition
Apr 10, 2019
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Header (metadata) release
Apr 17, 2019
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Map release
Jul 3, 2019
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Update
Aug 21, 2019
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Current status
Aug 21, 2019
Processing site: PDBe / Status: Released
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