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• W2024486172 abstract "Metal-containing polymer networks are widespread in biology, particularly for load-bearing exoskeletal biomaterials. Mytilus byssal cuticle is an especially interesting case containing moderate levels of Fe 3+ and cuticle protein—mussel foot protein-1 (mfp-1), which has a peculiar combination of high hardness and high extensibility. Mfp-1, containing 13 mol % of dopa (3, 4-dihydroxyphenylalanine) side-chains, is highly positively charged polyelectrolyte (pI ∼ 10) and didn’t show any cohesive tendencies in previous surface forces apparatus (SFA) studies. Here, we show that Fe 3+ ions can mediate unusually strong interactions between the positively charged proteins. Using an SFA, Fe 3+ was observed to impart robust bridging ( W ad ≈ 4.3 mJ/m 2 ) between two noninteracting mfp-1 films in aqueous buffer approaching the ionic strength of seawater. The Fe 3+ bridging between the mfp-1-coated surfaces is fully reversible in water, increasing with contact time and iron concentration up to 10 μM; at 100 μM, Fe 3+ bridging adhesion is abolished. Bridging is apparently due to the formation of multivalent dopa-iron complexes. Similar Fe-mediated bridging ( W ad ≈ 5.7 mJ/m 2 ) by a smaller recombinant dopa-containing analogue indicates that bridging is largely independent of molecular weight and posttranslational modifications other than dopa. The results suggest that dopa-metal interactions may provide an energetic new paradigm for engineering strong, self-healing interactions between polymers under water." @default.
• W2024486172 created "2016-06-24" @default.
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• W2024486172 date "2010-07-06" @default.
• W2024486172 modified "2023-09-30" @default.
• W2024486172 title "Strong reversible Fe ³⁺ -mediated bridging between dopa-containing protein films in water" @default.
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• W2024486172 doi "https://doi.org/10.1073/pnas.1007416107" @default.
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