Architectural and structural optimization of the protective polymer layer for enhanced targeting

Area of Science:

• Polymer Chemistry
• Biophysics
• Computational Chemistry

Background:

• Polymer layers are crucial for modifying surfaces and controlling interactions.
• Ligand architecture and polymer structure significantly impact functional group accessibility and binding.
• Optimizing receptor targeting is essential for applications in diagnostics and therapeutics.

Purpose of the Study:

• To investigate how ligand valence, branching, and polymer layer polydispersity affect functional group accessibility and receptor targeting efficiency.
• To compare the performance of multivalent and monovalent ligands.
• To evaluate the impact of bidisperse polymer layers on targeting capabilities.

Main Methods:

• Monte Carlo simulations were employed to model polymer layers and receptor interactions.
• Two receptor surface types were simulated: homogeneous and finite receptor sites.
• Ligand architecture (valence, branching) and polymer structure (polydispersity) were systematically varied.

Main Results:

• Multivalent ligands offer higher peripheral density and binding efficiency due to cooperativity.
• Short-branched divalent ligands excel with closely packed receptors but struggle with spaced receptors.
• Bidisperse polymer layers significantly increase peripheral functional groups and improve targeting through enhanced compressibility and reach.

Conclusions:

• Ligand valence and polymer layer bidispersity are key factors for efficient receptor targeting.
• Multivalent ligands and bidisperse layers provide complementary advantages.
• Combining multivalent ligands with bidisperse polymer layers offers a synergistic approach for enhanced targeting effects.