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Article Dans Une Revue European Physical Journal E: Soft matter and biological physics Année : 2001

Amphiphilic block copolymer nanocontainers as bioreactors

Résumé

Self-assembly of an amphiphilic triblock copolymer carrying polymerizable end-groups is used to prepare nanometer-sized vesicular structures in aqueous solution. The triblock copolymer shells of the vesicles can be regarded as a mimetic of biological membranes although they are 2 to 3 times thicker than a conventional lipid bilayer. Nevertheless, they can serve as a matrix for membrane-spanning proteins. Surprisingly, the proteins remain functional despite the extreme thickness of the membranes and that even after polymerization of the reactive triblock copolymers. This opens a new field to create mechanically stable protein/polymer hybrid membranes. As a representative example we functionalize (polymerized) triblock copolymer vesicles by reconstituting a channel-forming protein from the outer cell wall of Gram-negative bacteria. The protein used (OmpF) acts as a size-selective filter, which allows only for passage of molecules with a molecular weight below 400 g mol-1. Therefore substrates may still have access to enzymes encapsulated in such protein/polymer hybrid nanocontainers. We demonstrate this using the enzyme β-lactamase which is able to hydrolyze the antibiotic ampicillin. In addition, a transmembrane voltage above a given threshold causes a reversible gating transition of OmpF. This can be used to reversibly activate or deactivate the resulting nanoreactors.

Dates et versions

hal-01564182 , version 1 (18-07-2017)

Identifiants

Citer

Corinne Nardin, J. Widmer, M. Winterhalter, W. Meier. Amphiphilic block copolymer nanocontainers as bioreactors. European Physical Journal E: Soft matter and biological physics, 2001, 4 (4), pp.403-410. ⟨10.1007/s101890170095⟩. ⟨hal-01564182⟩
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