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Adhesive barnacle peptides exhibit a steric-driven design rule to enhance adhesion between asymmetric surfaces

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Raman,  Sangeetha
Interaction Forces and Functional Materials, Interface Chemistry and Surface Engineering, Max-Planck-Institut für Eisenforschung GmbH, Max Planck Society;

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Utzig,  Thomas
Interaction Forces and Functional Materials, Interface Chemistry and Surface Engineering, Max-Planck-Institut für Eisenforschung GmbH, Max Planck Society;

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Stock,  Philipp
Institut für Physikalische Chemie, der TU Bergakademie Freiberg, Leipziger Straße 29, Freiberg, Germany;
Interaction Forces and Functional Materials, Interface Chemistry and Surface Engineering, Max-Planck-Institut für Eisenforschung GmbH, Max Planck Society;

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Valtiner,  Markus
Interaction Forces and Functional Materials, Interface Chemistry and Surface Engineering, Max-Planck-Institut für Eisenforschung GmbH, Max Planck Society;
Institute for physical chemistry II, Technische Universität Bergakademie Freiberg, Leipzigerstraße 29, 09599 Freiberg, Germany ;

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Citation

Raman, S., Malms, L., Utzig, T., Shrestha, B. R., Stock, P., Krishnan, S., et al. (2017). Adhesive barnacle peptides exhibit a steric-driven design rule to enhance adhesion between asymmetric surfaces. Colloids and Surfaces B, 152, 42-48. doi:10.1016/j.colsurfb.2016.12.038.


Cite as: http://hdl.handle.net/11858/00-001M-0000-002D-AE5A-4
Abstract
Barnacles exhibit superior underwater adhesion simply through sequencing of the 21 proteinogenic amino acids, without post processing or using special amino acids. Here, we measure and discuss the molecular interaction of two distinct and recurring short peptide sequences (Bp1 and Bp2) inspired from the surface binding 19 kDa protein from the barnacle attachment interface. Using self-assembled mono layer (SAMs) of known physical and chemical properties on molecularly smooth gold substrates in 5 mM NaCl at pH 7.3, (1) the adsorption mechanisms of the barnacle inspired peptides are explored using quartz crystal microbalance, and (2) adhesion mediating properties are measured using the surface force apparatus. The hydrophobic Bp1 peptide with a cysteine residue adsorbs irreversibly onto Au surfaces due to thiol bond formation, while on hydrophobic CH3 SAM surface, the interactions are hydrophobic in nature. Interestingly, Bp2 that contains both hydrophobic and protonated amine units exhibits asymmetric bridging with an exceptionally high adhesion energy up to 100 mJ/m(2) between mica and both gold and CH3 SAM. Surprisingly on hydrophilic surfaces such as COOH- or OH-SAMs both peptides fail to show any interactions, implying the necessity of surface charge to promote bridging. Our results provide insights into the molecular aspects of manipulating and utilizing barnacle-mediated peptides to promote or inhibit underwater adhesion. (C) 2016 Elsevier B.V. All rights reserved.