Surface force measurements and simulations of mussel-derived peptide adhesives on wet organic surfaces
- Univ. of California, Santa Barbara, CA (United States). Dept. of Physics. Dept. of Chemistry and Biochemistry
- Univ. of California, Santa Barbara, CA (United States). Dept. of Chemical Engineering
- Univ. of California, Santa Barbara, CA (United States). Materials Research Lab.
- Rowan Univ., Glassboro, NJ (United States). Dept. of Chemistry and Biochemistry
- Lehigh Univ., Bethlehem, PA (United States). Dept. of Chemical and Biomolecular Engineering
- Univ. of California, Santa Barbara, CA (United States). Materials Research Lab. Dept. of Molecular, Cell and Developmental Biology
- Univ. of California, Santa Barbara, CA (United States). Dept. of Chemical Engineering. Materials Research Lab.
Translating sticky biological molecules—such as mussel foot proteins (MFPs)—into synthetic, cost-effective underwater adhesives with adjustable nano- and macroscale characteristics requires an intimate understanding of the glue’s molecular interactions. In this paper, to help facilitate the next generation of aqueous adhesives, we performed a combination of surface forces apparatus (SFA) measurements and replica-exchange molecular dynamics (REMD) simulations on a synthetic, easy to prepare, Dopa-containing peptide (MFP-3s peptide), which adheres to organic surfaces just as effectively as its wild-type protein analog. Experiments and simulations both show significant differences in peptide adsorption on CH3-terminated (hydrophobic) and OH-terminated (hydrophilic) self-assembled monolayers (SAMs), where adsorption is strongest on hydrophobic SAMs because of orientationally specific interactions with Dopa. Finally, additional umbrella-sampling simulations yield free-energy profiles that quantitatively agree with SFA measurements and are used to extract the adhesive properties of individual amino acids within the context of MFP-3s peptide adhesion, revealing a delicate balance between van der Waals, hydrophobic, and electrostatic forces.
- Research Organization:
- Lehigh Univ., Bethlehem, PA (United States); Univ. of California, Santa Barbara, CA (United States)
- Sponsoring Organization:
- USDOE Office of Science (SC), Basic Energy Sciences (BES); National Science Foundation (NSF); National Inst. of Health (NIH) (United States)
- Grant/Contract Number:
- SC0013979; MCB-1158577; DMR 1121053; CNS-0960316; ACI-1053575; R01 DE018468
- OSTI ID:
- 1469313
- Journal Information:
- Proceedings of the National Academy of Sciences of the United States of America, Vol. 113, Issue 16; ISSN 0027-8424
- Publisher:
- National Academy of Sciences, Washington, DC (United States)Copyright Statement
- Country of Publication:
- United States
- Language:
- English
Web of Science
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