Atomistic Insights into Graphene Oxide Dot Interactions with Integrin α_Vβ₃ from Microsecond Simulations

Area of Science:

• Biomaterials Science
• Nanotechnology
• Computational Biology

Background:

• Graphene oxide (GO) nanomaterials functionalized with targeting ligands offer potential for selective cancer drug delivery.
• Integrin αVβ3 is a key target in cancer therapy, often addressed with cyclic Arg-Gly-Asp (cRGD) peptides.

Purpose of the Study:

• To investigate the molecular interactions between cRGD-functionalized GO nanocarriers and integrin αVβ3 using all-atom molecular dynamics simulations.
• To understand the specific ligand recognition and non-specific interactions governing nanocarrier-receptor binding.

Main Methods:

• All-atom molecular dynamics (MD) simulations.
• Multiple 1 μs simulation replicas were performed.
• Analysis of specific ligand-receptor and non-specific nanocarrier-receptor interactions.

Main Results:

• cRGD peptide binding to the integrin αVβ3 binding pocket was found to be stable, confirming receptor recognition is not impaired.
• Polyethylene glycol (PEG)-cRGD chains and the GO surface engage in additional contacts with the integrin.
• The orientation of the GO plane influences the nature and distribution of these additional interactions.
• Integrin αVβ3 structural dynamics are maintained upon nanocarrier binding.

Conclusions:

• Atomistic insights into the interplay between ligand-mediated and surface-mediated interactions of GO nanocarriers with integrins were provided.
• These findings support the rational design of selective nanocarriers for enhanced cancer therapy.
• The study elucidates the binding mechanisms crucial for developing effective targeted drug delivery systems.