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Cooperative behavior of a sacrificial bond network and elastic framework in providing self-healing capacity in mussel byssal threads

MPG-Autoren
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Reinecke,  Antje
Matthew Harrington, Biomaterialien, Max Planck Institute of Colloids and Interfaces, Max Planck Society;

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Bertinetti,  Luca
Luca Bertinetti (Indep. Res.), Biomaterialien, Max Planck Institute of Colloids and Interfaces, Max Planck Society;

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Fratzl,  Peter
Peter Fratzl, Biomaterialien, Max Planck Institute of Colloids and Interfaces, Max Planck Society;

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Harrington,  Matthew J.
Matthew Harrington, Biomaterialien, Max Planck Institute of Colloids and Interfaces, Max Planck Society;

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Zitation

Reinecke, A., Bertinetti, L., Fratzl, P., & Harrington, M. J. (2016). Cooperative behavior of a sacrificial bond network and elastic framework in providing self-healing capacity in mussel byssal threads. Journal of Structural Biology, 196(3), 329-339. doi:10.1016/j.jsb.2016.07.020.


Zitierlink: https://hdl.handle.net/11858/00-001M-0000-002B-19EB-6
Zusammenfassung
The dissipative and self-healing properties of mussel byssal threads are critical for their function as anchoring fibers in wave-battered habitats and central to their emergence as an exciting model system for bio-inspired polymers. Much is now understood about the structure-function relationships defining this remarkable proteinaceous bio-fiber; however, the molecular mechanisms underlying the distinctive tough, viscoelastic and self-healing behavior are still unclear. Here, we investigate elastic and dissipative contributions from the primary load-bearing proteins in the distal region of byssal threads (the preCols) using X-ray diffraction (XRD) combined with in situ tensile testing. Specifically, we identified cross β-sheet structure in the preCol flanking domains that functions as an elastic framework, providing hidden length. Dissipative behavior was associated with a strain-rate dependent phase transition of a sacrificial network stabilized by strong, reversible cross-links. Based on these findings, we posit a new model for byssal thread deformation and self-healing.