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The interaction of β2-microglobulin with gold nanoparticles: impact of coating, charge and size

Cantarutti, C; Bertoncin, P; Posocco, P; Hunashal, Y; Giorgetti, S; Bellotti, V; Fogolari, F; (2018) The interaction of β2-microglobulin with gold nanoparticles: impact of coating, charge and size. Journal of Materials Chemistry B , 6 (37) pp. 5964-5974. 10.1039/c8tb01129j. Green open access

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Abstract

Gold nanoparticles (AuNPs) have been proved to be ideal scaffolds to build nanodevices whose performance can be tuned by changing their coating. In particular, the interaction of AuNPs with proteins was revealed to be highly dependent on the physico-chemical properties of the gold cluster protecting monolayer. In this work we studied the behavior of three different alkanethiolate-coated AuNPs (AT-AuNPs) when they are incubated with a model amyloidogenic protein, β2-microglobulin (β2m), whose clinical relevance in dialysis-related amyloidosis (DRA) and structural properties are well known. To the aim we synthesized 6-mercaptohexanoic acid-coated AuNPs (MHA-AuNPs) and (11-mercaptoundecyl)-N,N,N-trimethylammonium bromide-coated AuNPs (MUTAB-AuNPs) of 7.5 nm diameter and 3-mercaptopropionic acid-coated AuNPs (MPA-AuNPs) of 3.6 nm diameter. To study the effects of the incubation with β2m of these NPs that differ in charge and dimension, we employed NMR, UV-vis and fluorescence spectroscopy, along with transmission electron microscopy (TEM). The three tested AuNP systems gave different results. We found that MHA-AuNPs precipitate with the protein into large agglomerates inducing β2m unfolding, MUTAB-AuNP precipitation is triggered by the protein that remains unchanged in solution, at least at the higher considered protein/NP ratio, and MPA-AuNPs interact preferentially with a localized region of the protein that stays essentially stably dissolved. These results stress the complexity of the bio-nano interface and the relevance and viability of the fine control of NP properties to master protein–NP interactions.

Type: Article
Title: The interaction of β2-microglobulin with gold nanoparticles: impact of coating, charge and size
Open access status: An open access version is available from UCL Discovery
DOI: 10.1039/c8tb01129j
Publisher version: http://dx.doi.org/10.1039/C8TB01129J
Language: English
Additional information: This version is the author accepted manuscript. For information on re-use, please refer to the publisher’s terms and conditions.
Keywords: nanoparticles, protein folding, nanotechnology, surface chemistry
UCL classification: UCL
UCL > Provost and Vice Provost Offices > School of Life and Medical Sciences
UCL > Provost and Vice Provost Offices > School of Life and Medical Sciences > Faculty of Medical Sciences
UCL > Provost and Vice Provost Offices > School of Life and Medical Sciences > Faculty of Medical Sciences > Div of Medicine
UCL > Provost and Vice Provost Offices > School of Life and Medical Sciences > Faculty of Medical Sciences > Div of Medicine > Inflammation
URI: https://discovery.ucl.ac.uk/id/eprint/10061376
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