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Preparation and Characterization of Nanoliposomes for the Entrapment of Bioactive Hydrophilic Globular Proteins

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A centrifugation-based physicochemical characterization method for the interaction between proteins and

Ahmet Bekdemir¹, Francesco Stellacci^1,2

¹Institute of Materials, Ecole Polytechnique Fédérale de Lausanne (EPFL), CH-1015 Lausanne, Switzerland.

Nature Communications

|October 21, 2016

Summary

This summary is machine-generated.

A new analytical ultracentrifugation method accurately measures interactions between small gold nanoparticles and proteins without labels. This technique determines binding constants and reveals non-spherical complex shapes, advancing nanomedicine research.

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Area of Science:

Biophysics
Nanotechnology
Materials Science

Background:

Nanomedicine relies on understanding nanoparticle-protein interactions.
Current methods are limited to large or labeled nanoparticles, hindering studies on small ones.

Purpose of the Study:

To develop a label-free method for characterizing nanoparticle-protein interactions.
To determine binding constants (K_D), stoichiometry (N_max), and Hill coefficient (n) for gold nanoparticles and bovine serum albumin (BSA).
To assess the shape of nanoparticle-protein complexes.

Main Methods:

Utilizing analytical ultracentrifugation (AUC) with absorbance detection at 520 nm.
Employing AUC for label-free analysis of protein-nanoparticle association.
Applying frictional ratio analysis to assess complex shape.

Main Results:

The AUC method accurately quantifies binding parameters (K_D, N_max, n) for small gold nanoparticles and BSA.
Measurements are insensitive to unbound or aggregated proteins.
Frictional ratio analysis indicates significant deviation from spherical shape in small nanoparticle/protein complexes.

Conclusions:

Analytical ultracentrifugation provides a robust, label-free method for studying small nanoparticle-protein interactions.
This technique overcomes limitations of existing methods, enabling detailed characterization.
The findings suggest potential for AUC to become a standard approach in nanomedicine research.