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Ultrasmall Gold Nanoparticles Coated with Zwitterionic Glutathione Monoethyl Ester: A Model Platform for the Incorporation of Functional Peptides
journal contribution
posted on 2020-04-30, 17:03 authored by Luiza
L. Knittel, Huaying Zhao, Ai Nguyen, Antônio Miranda, Peter Schuck, Alioscka A. SousaUltrasmall gold nanoparticles (AuNPs)
are an emerging class of
nanomaterials exhibiting distinctive physicochemical, molecular, and in vivo properties. Recently, we showed that ultrasmall
AuNPs encompassing a zwitterionic glutathione monoethyl ester surface
coating (AuGSHzwt) were highly resistant to aggregation
and serum protein interactions. Herein, we performed a new set of
biointeraction studies to gain a more fundamental understanding into
the behavior of both pristine and peptide-functionalized AuGSHzwt in complex media. Using the model Strep-tag peptide (WSHPQFEK)
as an integrated functional group, we established that AuGSHzwt could be conjugated with increasing numbers of Strep-tags by simple
ligand exchange, which provides a generic approach for AuGSHzwt functionalization. It was found that the strep-tagged AuGSHzwt particles were highly resistant to nonspecific protein
interactions and retained their targeting capability in biological
fluid, displaying efficient binding to Streptactin receptors in nearly
undiluted serum. However, AuGSHzwt functionalized with
multiple Strep-tags displayed somewhat lower resistance to protein
interactions and lower levels of binding to Streptactin than monofunctionalized
AuGSHzwt under given conditions. These results underscore
the need for optimizing ligand density onto the surface of ultrasmall
AuNPs for improved performance. Collectively, our findings support
ultrasmall AuGSHzwt as an attractive platform for engineering
functional, protein-mimetic nanostructures capable of specific protein
recognition within the complex biological milieu.
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Keywords
protein interactionsWSHPQFEKfindings support ultrasmall AuGSH zwtAuGSH zwt functionalizationmodel Strep-tag peptidezwitterionic glutathione monoethyl ester surface coatingAuGSH zwt functionalizedmonofunctionalized AuGSH zwtserum protein interactionsAuGSH zwtZwitterionic Glutathione Monoethyl EsterFunctional Peptides Ultrasmall gold nanoparticlesultrasmall AuNPsUltrasmall Gold Nanoparticles Coatedstrep-tagged AuGSH zwt particlespeptide-functionalized AuGSH zwt
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