Fig. 3 Underwater adhesion performance of adhesive coatings made of mammalian LC domain proteins. Underwater adhesion performance of adhesive coatings.

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Fig. 3 Underwater adhesion performance of adhesive coatings made of mammalian LC domain proteins. Underwater adhesion performance of adhesive coatings made of mammalian LC domain proteins. (A) Schematic of a colloidal AFM probe used to measure the asymmetric adhesion of adhesive coatings on smooth mica surfaces. (B) Comparison of adhesion forces [normalized force (F/R) and adhesion energies (Ead = F/3πR)] for TLC-M coatings produced at 4 and 25°C (measured with a gold probe tip). Representative adhesion force-distance curves in the right panel were collected on one spot of the coated mica surface using the single force mode (gold probe tip). (C) Comparison of adhesion forces and adhesion energies for the TDP43 LC domain (control), unmodified TLC-M, and DOPA-modified TLC-M coatings produced at 4°C (gold probe tip) (left) and representative adhesion force-distance curves of the control TDP43 LC, unmodified TLC-M, and DOPA-modified TLC-M coatings (right); the curves correspond to three random spots of the coated mica surface (single force mode; gold probe tip). (D) Frequency change comparison in QCM-D experiments showing the different adsorption capacities of unmodified TLC-M and DOPA-modified TLC-M coatings for a gold surface at 4°C. Inset: Plots of ΔD versus ΔF corresponding to the frequency change curve. (E) CR staining of DOPA-modified TLC-M coatings (produced in solution pH 5, 0.05 M NaCl) after a continuous 7-day incubation under harsh conditions (pH 3 and 11 buffers, 1.0 M high NaCl concentration buffer). (F) Adhesion forces and adhesion energies for DOPA-modified TLC-M coatings produced at a range of pH values (3 to 11) at 4°C measured in pH 5 buffer with a gold probe tip. (G) Adhesion forces and adhesion energies for DOPA-modified TLC-M coatings produced at a range of NaCl concentrations (50 to 1000 mM) at 4°C measured in pH 5 buffer with a gold probe tip. **P < 0.01, Student’s t test. Error bars indicate the SD. For each comparison in (B), (C), (E), and (F), n = 25 (five spots per mica plate, with each spot sampled five times using single force mode). In (B) and (D), the adhesion force curves are plotted as force-displacement curves: The x axis labeled as Z snsr (Z sensor) represents the displacement between the sample surface and the resting position of the cantilever (rather than the actual distance between the sample surface and the AFM tip). Note that all the underwater adhesion measurements were performed at 25°C aqueous temperature. Mengkui Cui et al. Sci Adv 2019;5:eaax3155 Copyright © 2019 The Authors, some rights reserved; exclusive licensee American Association for the Advancement of Science. No claim to original U.S. Government Works. Distributed under a Creative Commons Attribution NonCommercial License 4.0 (CC BY-NC).