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Issue 3, 2018

Probing fibronectin conformation on a protein corona layer around nanoparticles

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Abstract

Protein unfolding induced by nanoparticles (NPs) can lead to exposure of cryptic epitopes that might dictate biological identity and affect NP biological fate (e.g., blood circulation time, biodistribution, and tumor accumulation). Here, we monitor the conformation of fluorescence resonance energy transfer (FRET)-labelled fibronectin (FN) on corona-coated gold NPs. We found that the labelled FN proteins, which directly accessed the gold NP surface, underwent more pronounced conformational changes than those associated with the protein corona via protein–protein interactions. FRET and liquid chromatography–mass spectrometry analyses demonstrated that NP size/concentration, pH change, and the level of surface coverage by the corona can tune the accessibility of labelled FN to the gold NP surface. Although some subsequently adsorbing proteins accessed the NP surface thanks to incomplete surface coverage and protein exchange (the Vroman effect), most outer-layer proteins could not directly bind to the NP surface, blocked by pre-adsorbed corona layers. This finding was also partially confirmed by isothermal titration calorimetry (ITC) analysis. These results suggest the proof-of-concept that outermost-layer proteins with modestly changed conformation rather than unfolded proteins at the gold NP surface effectively create the NPs’ biological identity, which might have important implications on biological fates of gold NPs.

Graphical abstract: Probing fibronectin conformation on a protein corona layer around nanoparticles

Supplementary files

Article information


Submitted
19 Sep 2017
Accepted
08 Dec 2017
First published
11 Dec 2017

Nanoscale, 2018,10, 1228-1233
Article type
Paper

Probing fibronectin conformation on a protein corona layer around nanoparticles

M. Raoufi, M. J. Hajipour, S. M. Kamali Shahri, I. Schoen, U. Linn and M. Mahmoudi, Nanoscale, 2018, 10, 1228 DOI: 10.1039/C7NR06970G

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