Modulation of Biointeractions by Electrically Switchable Oligopeptide Surfaces: Structural Requirements and Mechanism

Area of Science:

• Surface Science
• Biomolecular Engineering
• Materials Science

Background:

• Controllable surface materials are crucial for advanced applications.
• Understanding dynamic surface behavior is key to developing tailor-made materials.
• Self-assembled monolayers (SAMs) offer a platform for surface functionalization.

Purpose of the Study:

• To investigate the conformational mechanism of electrically switchable mixed SAMs based on oligopeptides.
• To elucidate structural requirements for regulating biomolecular interactions on surfaces.
• To understand how oligopeptide conformation controls protein-ligand binding.

Main Methods:

• Experimental investigation of mixed SAMs composed of oligopeptides.
• Utilized a model system: neutravidin protein interacting with surface-tethered biotin ligands.
• Integrated computational modeling with experimental data analysis.

Main Results:

• A switching mechanism was identified, controlled by conformational changes between extended ('ON') and collapsed ('OFF') oligopeptide states.
• Extended conformation allows efficient biotin-neutravidin binding; collapsed conformation sterically hinders binding.
• Oligopeptide length and steric hindrances from neighboring chains significantly influence switching efficiency.

Conclusions:

• Biomolecular interactions can be dynamically regulated by controlling oligopeptide conformation on switchable surfaces.
• This study provides a foundation for designing dynamic surface materials with tunable biological functions.
• Potential applications in various biological and medical fields due to controllable binding capabilities.