Peptide-Protein Coassemblies into Hierarchical and Bioactive Tubular Membranes

Area of Science:

• Biomaterials Science
• Supramolecular Chemistry
• Chemical Engineering

Background:

• Multicomponent self-assembly is a powerful strategy for creating functional biomaterials.
• Peptide amphiphiles (PAs) and elastin-like recombinamers (ELs) are versatile building blocks for self-assembled structures.
• Controlling the self-assembly process is key to tailoring biomaterial properties.

Purpose of the Study:

• To investigate how minor molecular modifications in PAs and ELs influence coassembly into tubular membranes.
• To demonstrate the ability to tune the structure, properties, and bioactivity of these membranes.
• To explore the use of cell-adhesive peptides to impart specific bioactivities.

Main Methods:

• Synthesizing modified peptide amphiphiles (PAs) with varying charge densities (PAK2, PAK3, PAK4).
• Coassembling PAs with elastin-like recombinamers (ELs) under controlled conditions.
• Introducing the RGDS cell-adhesive peptide into either PA or EL components.
• Characterizing the resulting tubular membrane microstructures, properties, and bioactivities.

Main Results:

• Modifications in PA charge density triggered distinct diffusion-reaction processes, leading to varied membrane microstructures.
• Combinations of different PAs with ELs allowed further tuning of membrane structure and properties.
• Incorporation of RGDS peptide resulted in tubular membranes with distinct, tunable bioactivities.
• Demonstrated precise control over coassembly processes through subtle molecular design.

Conclusions:

• Minor molecular modifications in PAs and ELs are sufficient to significantly alter coassembly pathways and resulting biomaterial characteristics.
• This approach offers a versatile platform for designing functional tubular membranes with tailored structures and bioactivities.
• The findings provide a foundation for developing advanced, responsive biomaterials for various applications.