Interaction of apo cytochrome c with sulfonated polystyrene nanoparticles

Area of Science:

• Polymer Science
• Materials Science
• Biophysics

Background:

• Stable nanoparticle dispersions are crucial for various applications.
• Controlling nanoparticle properties through chemical modification is key.
• Understanding nanoparticle-protein interactions is vital for biomaterials and drug delivery.

Purpose of the Study:

• To synthesize and characterize stable sulfonated polystyrene nanoparticles in aqueous solution.
• To investigate the formation and properties of complexes between sulfonated polystyrene nanoparticles and apo cytochrome c.
• To elucidate the factors influencing the size, morphology, and hydrophobicity of these complexes.

Main Methods:

• Dynamic laser light-scattering for size distribution analysis.
• Fluorescence microscopy for structural and morphological characterization.
• Atomic force microscopy for detailed particle imaging and complex analysis.

Main Results:

• Stable, well-dispersed sulfonated polystyrene nanoparticles were achieved.
• Complex formation with apo cytochrome c was observed, influenced by component ratios.
• Nanoparticle excess led to stable complexes with peripheral binding, while protein excess resulted in larger, linked structures.
• Hydrophobicity/hydrophilicity of complexes varied with component ratio, sulfonation degree, and pH.
• Apo cytochrome c interactions included charge neutralization and potential core disruption.

Conclusions:

• Partially sulfonated polystyrene provides a versatile platform for stable nanoparticle synthesis.
• The interaction with apo cytochrome c offers tunable control over complex size and properties.
• These findings have implications for developing novel nanomaterials and understanding protein-nanoparticle interactions.