Cross-linker unbinding and self-similarity in bundled cytoskeletal networks.
The macromechanical properties of purely bundled in vitro actin networks are not only determined by the micromechanical properties of individual bundles but also by molecular unbinding events of the actin-binding protein (ABP) fascin. Under high mechanical load the network elasticity depends on the forced unbinding of individual ABPs in a rate dependent manner. Cross-linker unbinding in combination with the structural self-similarity of the network enables the introduction of a concentration-time superposition principle--broadening the mechanically accessible frequency range over 8 orders of magnitude.
Lieleg
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Lehrstuhl für Biophysik E22, Technische Universität München, James-Franck-Strasse 1, 85748 Garching, Germany.
Bausch
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AR
D000199:Actins / Q000737:chemistry; D001696:Biomechanical Phenomena; D002352:Carrier Proteins / Q000737:chemistry; D003432:Cross-Linking Reagents; D003599:Cytoskeleton / Q000648:ultrastructure*; D004548:Elasticity; D007700:Kinetics; D008840:Microfilament Proteins / Q000737:chemistry; D011485:Protein Binding; D014783:Viscosity
D000199:Actins; D002352:Carrier Proteins; D003432:Cross-Linking Reagents; D008840:Microfilament Proteins; C020324:fascin