Modeling of peptide adsorption interactions with a poly(lactic acid) surface

Area of Science:

• Biomaterials Science
• Computational Chemistry
• Surface Chemistry

Background:

• Biocompatibility of implants depends on protein adsorption.
• Understanding protein-surface interactions is crucial for biomaterial design.

Purpose of the Study:

• To elucidate mechanisms governing peptide adsorption to polylactide (PLA) surfaces.
• To quantify peptide-PLA interactions using molecular dynamics.

Main Methods:

• Employed biased replica exchange molecular dynamics (B-REMD).
• Addressed spatial and conformational sampling problems.
• Simulated adsorption of a nine-residue peptide (GGGG-K-GGGG) to a crystalline PLA surface.

Main Results:

• Predicted strong peptide adsorption with a free energy of -2.5 ± 0.6 kcal/mol.
• Identified hydrophobic interactions as the primary driving force.
• Characterized atomic-level interactions between the peptide and PLA surface.

Conclusions:

• Hydrophobic interactions significantly influence peptide adsorption on PLA.
• Molecular simulations provide atomic-level insights for biomaterial design.
• This work advances biomaterial engineering from trial-and-error to an atomistic understanding.