Differences in Solution Behavior among Four Semiconductor-Binding Peptides

TL;DR

This study uses all-atom Monte Carlo simulations to analyze the structural behavior of four peptides with semiconductor-binding affinity, revealing differences in flexibility that may explain their adhesion properties.

Contribution

It provides the first computational analysis of peptide structures related to semiconductor binding, highlighting structural variability as a key factor.

Findings

One peptide is more flexible and structurally distinct.

All peptides are largely unstructured at room temperature.

Structural differences may influence adhesion properties.

Abstract

Recent experiments have identified peptides with adhesion affinity for GaAs and Si surfaces. Here we use all-atom Monte Carlo (MC) simulations with implicit solvent to investigate the behavior in aqueous solution of four such peptides, all with 12 residues. At room temperature, we find that all the four peptides are largely unstructured, which is consistent with experimental data. At the same time, we find that one of the peptides is structurally different and more flexible, compared to the others. This finding points at structural differences as a possible explanation for differences in adhesion properties between these peptides. By also analyzing designed mutants of two of the peptides, an experimental test of this hypothesis is proposed.