Polymerizable biomimetic vesicles with controlled local presentation of adhesive functional DOPA groups

Area of Science:

• Biomaterials Science
• Polymer Chemistry
• Surface Science

Background:

• Mussel footprint proteins exhibit strong adhesion due to dihydroxyphenylalanine (DOPA) residues.
• Controlled presentation of DOPA is key to modulating adhesion at artificial interfaces.

Purpose of the Study:

• To develop a novel method for presenting DOPA groups in a defined manner to control adhesion between artificial interfaces.
• To synthesize peptide amphiphiles with DOPA and polymerizable tails for creating adhesive nanostructures.

Main Methods:

• Synthesis of linear peptide amphiphiles with DOPA and diacetylenic tails.
• Coassembly of amphiphiles into vesicles with matrix amphiphiles.
• UV-light-induced solid-state polymerization for vesicle stabilization.
• Macroscopic shear tests to evaluate adhesive properties of surface-adsorbed vesicles.

Main Results:

• Vesicles self-assembled into spherical, fibrilar, or planar nanostructures based on amphiphile ratios.
• Surface-confined vesicles significantly enhanced substrate adhesion.
• Adhesion strongly depended on DOPA group presentation (mono- or multilayer).

Conclusions:

• The developed DOPA-presenting vesicles offer a tunable approach to nanoscale adhesion.
• These structures can be transferred from aqueous solutions, enabling applications as nanoscale gluing pads.
• This method overcomes limitations of traditional polymer glues in forming controlled nanoscale adhesion.