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A simple route to highly active single-enzyme nanogels

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Abstract

We have established a simple one-step synthesis of single-enzyme nanogels (SENs), i.e., nanobiocatalysts consisting of an enzyme molecule embedded in a hydrophilic, polymeric crosslinked nanostructure, as a most attractive approach to enhance the stability of enzymes. In contrast to earlier protocols, we demonstrate here that the addition of a small amount of sucrose makes the nanogel formation equally effective as earlier two-step protocols requiring enzyme pre-modification. This provides the dual advantage of skipping a synthetic step and preserving the surface chemistry of the enzymes, hence their native structure. Enzymes encapsulated in this way exhibit a high catalytic activity, similar to that of the free enzymes, in a markedly widened pH range. With our method, the thickness of the hydrogel layer can be finely tuned by careful adjustment of reaction parameters. This is most important because the shell thickness strongly affects both enzyme activity and stability, as we observe for a wide selection of proteins. Finally, a single-molecule analysis by means of two-color confocal fluorescence coincidence analysis confirms that our encapsulation method is highly efficient and suppresses the occurrence of nanoparticles lacking an enzyme molecule. The proposed method is therefore highly attractive for biocatalysis applications, ensuring a high activity and stability of the enzymes.

Graphical abstract: A simple route to highly active single-enzyme nanogels

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Publication details

The article was received on 13 Oct 2017, accepted on 30 Nov 2017 and first published on 01 Dec 2017


Article type: Edge Article
DOI: 10.1039/C7SC04438K
Citation: Chem. Sci., 2018, Advance Article
  • Open access: Creative Commons BY-NC license
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    A simple route to highly active single-enzyme nanogels

    A. Beloqui, A. Y. Kobitski, G. U. Nienhaus and G. Delaittre, Chem. Sci., 2018, Advance Article , DOI: 10.1039/C7SC04438K

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