Application of isothermal titration calorimetry in evaluation of protein-nanoparticle interactions

作者：Omanovic Miklicanin Enisa^*; Manfield Iain; Wilkins Terry

来源：Journal of Thermal Analysis and Calorimetry, 2017, 127(1): 605-613.

DOI：10.1007/s10973-016-5764-4

• Isothermal titration calorimetry
• Nanoparticles
• Proteins
• Interactions
• Gold nanoparticles
• Protein-nanoparticle interaction

Nanoparticles (NPs) offer a number of advantages over small organic molecules for controlling protein behaviour inside the cell. Protein binding to the surface of NPs depends on their surface characteristics, composition and method of preparation (Mandal et al. in J Hazard Mater 248-249:238-245, 2013). It is important to understand the binding affinities, stoichiometries and thermodynamical parameters of NP-protein interactions in order to see which interaction will have toxic and hazardous consequences and thus to prevent it. On the other side, because proteins are on the brink of stability, they may experience interactions with some types of NPs that are strong enough to cause denaturation or significantly change their conformations with concomitant loss of their biological function. Structural changes in the protein may cause exposure of new antigenic sites, "cryptic" peptide epitopes, potentially triggering an immune response which can promote autoimmune disease (Treuel et al. in ACS Nano 8(1):503-513, 2014). Mechanistic details of protein structural changes at NP surface have still remained elusive. Understanding the formation and persistence of the protein corona is critical issue; however, there are no many analytical methods which could provide detailed information about the NP-protein interaction characteristics and about protein structural changes caused by interactions with nanoparticles. The article reviews recent studies in NP-protein interactions research and application of isothermal titration calorimetry (ITC) in this research. The study of protein structural changes upon adsorption on nanoparticle surface and application of ITC in these studies is emphasized. The data illustrate that ITC is a versatile tool for evaluation of interactions between NPs and proteins. When coupled with other analytical methods, it is important analytical tool for monitoring conformational changes in proteins.

• 出版日期2017-1