Abstract
Many natural underwater adhesives harness hierarchically assembled amyloid nanostructures to achieve strong and robust interfacial adhesion under dynamic and turbulent environments. Despite recent advances, our understanding of the molecular design, self-assembly and structure–function relationships of these natural amyloid fibres remains limited. Thus, designing biomimetic amyloid-based adhesives remains challenging. Here, we report strong and multi-functional underwater adhesives obtained from fusing mussel foot proteins (Mfps) of Mytilus galloprovincialis with CsgA proteins, the major subunit of Escherichia coli amyloid curli fibres. These hybrid molecular materials hierarchically self-assemble into higher-order structures, in which, according to molecular dynamics simulations, disordered adhesive Mfp domains are exposed on the exterior of amyloid cores formed by CsgA. Our fibres have an underwater adhesion energy approaching 20.9 mJ m−2, which is 1.5 times greater than the maximum of bio-inspired and bio-derived protein-based underwater adhesives reported thus far. Moreover, they outperform Mfps or curli fibres taken on their own and exhibit better tolerance to auto-oxidation than Mfps at pH ≥ 7.0.
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Acknowledgements
The authors thank A. Schwartzman for help in applying AFM colloid nanoparticle technology for measuring adhesive forces and H. Tavakoli Nia (Ortiz group, MIT) for initial discussions regarding this technology. The authors acknowledge help from the NERCE Biomolecule Production Laboratory (Harvard University) for producing part of the cell pellets for protein purification. The authors also thank the Whitehead Institute and the Biopolymers Laboratory in the David H. Koch Institute for Integrated Cancer Research and the Institute for Soldier Nanotechnologies for access to characterization equipment. This research was primarily supported by the Office of Naval Research (N000141310647). This work was also supported in part by the MRSEC Program of the National Science Foundation under award no. DMR-0819762. T.K.L. acknowledges support from the NIH New Innovator Award (1DP2OD008435). The molecular dynamics modelling used the computer cluster and corresponding materials based upon work supported by the National Science Foundation under award no. 0821391.
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T.K.L. directed the research. C.Z. conceived the technical details and designed the experiments. C.Z. performed or participated in all the experiments. J.D. performed experiments in protein expression and purification. Z.D. assisted in collecting and analysing the fluorescence emission and excitation spectra. A.C. constructed the genes. C.M.S. and T.G. designed the simulations. T.G. performed the simulations. C.Z. and T.K.L. wrote the manuscript with help from all authors. All authors contributed to revising the manuscript.
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T.K.L. and C.Z. have filed a patent disclosure with the MIT Technology Licensing Office on this work.
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Zhong, C., Gurry, T., Cheng, A. et al. Strong underwater adhesives made by self-assembling multi-protein nanofibres. Nature Nanotech 9, 858–866 (2014). https://doi.org/10.1038/nnano.2014.199
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DOI: https://doi.org/10.1038/nnano.2014.199
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