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Protein-protein Interfaces

Protein-protein Interfaces

Many proteins form complexes to carry out their functions, making protein-protein interactions (PPIs) essential for an organism's survival. Most PPIs are stabilized by numerous weak noncovalent chemical forces. The physical shape of the interfaces determines the way two proteins interact. Many globular proteins have closely-matching shapes on their surfaces, which form a large number of weak bonds. Additionally, many PPIs occur between two helices or between a surface cleft and a...

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

Chun L Yeung¹, Xingyong Wang², Minhaj Lashkor¹

¹School of Chemical Engineering, University of Birmingham Edgbaston, Birmingham, B15 2TT, UK

Advanced Materials Interfaces

|March 21, 2015

Summary

Switchable surfaces using oligopeptides can control biomolecular interactions. Conformational changes between extended and collapsed states regulate protein binding, enabling dynamic surface material design.

Keywords:

electrochemistry molecular dynamic simulations self-assembled monolayers surface plasmon resonance switchable surfaces

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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.