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TitleTalin-activated vinculin interacts with branched actin networks to initiate bundles.
Journal, issue, pagesElife, Vol. 9, Year 2020
Publish dateNov 13, 2020
AuthorsRajaa Boujemaa-Paterski / Bruno Martins / Matthias Eibauer / Charlie T Beales / Benjamin Geiger / Ohad Medalia /
PubMed AbstractVinculin plays a fundamental role in integrin-mediated cell adhesion. Activated by talin, it interacts with diverse adhesome components, enabling mechanical coupling between the actin cytoskeleton ...Vinculin plays a fundamental role in integrin-mediated cell adhesion. Activated by talin, it interacts with diverse adhesome components, enabling mechanical coupling between the actin cytoskeleton and the extracellular matrix. Here we studied the interactions of activated full-length vinculin with actin and the way it regulates the organization and dynamics of the Arp2/3 complex-mediated branched actin network. Through a combination of surface patterning and light microscopy experiments we show that vinculin can bundle dendritic actin networks through rapid binding and filament crosslinking. We show that vinculin promotes stable but flexible actin bundles having a mixed-polarity organization, as confirmed by cryo-electron tomography. Adhesion-like synthetic design of vinculin activation by surface-bound talin revealed that clustered vinculin can initiate and immobilize bundles from mobile Arp2/3-branched networks. Our results provide a molecular basis for coordinate actin bundle formation at nascent adhesions.
External linksElife / PubMed:33185186 / PubMed Central
MethodsEM (helical sym.)
Resolution14.2 Å
Structure data

EMDB-10737:
Actin filament structure from vinculin-induced bundles
Method: EM (helical sym.) / Resolution: 14.2 Å

Source
  • Oryctolagus cuniculus (rabbit)

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