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Issue 10, 2015

Assembly of a photosynthetic reaction center with ABA tri-block polymersomes: highlights on protein localization

Author affiliations

Abstract

The reconstitution of the integral membrane protein photosynthetic reaction center (RC) in polymersomes, i.e. artificial closed vesicles, was achieved by the micelle-to-vesicle transition technique, a very mild protocol based on size exclusion chromatography often used to drive the incorporation of proteins contemporarily to liposome formation. An optimized protocol was used to successfully reconstitute the protein in a fully active state in polymersomes formed by the tri-block copolymers PMOXA22–PDMS61–PMOXA22. The RC is very sensitive to its solubilizing environment and was used to probe the positioning of the protein in the vesicles. According to charge-recombination experiments and to the enzymatic activity assay, the RC is found to accommodate in the PMOXA22 region of the polymersome, facing the water bulk solution, rather than in the PDMS61 transmembrane-like region. Furthermore, polymersomes were found to preserve protein integrity efficiently as the biomimetic lipid bilayers but show a much longer temporal stability than lipid based vesicles.

Graphical abstract: Assembly of a photosynthetic reaction center with ABA tri-block polymersomes: highlights on protein localization

Supplementary files

Article information


Submitted
03 May 2015
Accepted
06 Jul 2015
First published
07 Jul 2015

Photochem. Photobiol. Sci., 2015,14, 1844-1852
Article type
Paper
Author version available

Assembly of a photosynthetic reaction center with ABA tri-block polymersomes: highlights on protein localization

R. R. Tangorra, A. Operamolla, F. Milano, O. H. Omar, J. Henrard, R. Comparelli, F. Italiano, A. Agostiano, V. De Leo, R. Marotta, A. Falqui, G. M. Farinola and M. Trotta, Photochem. Photobiol. Sci., 2015, 14, 1844 DOI: 10.1039/C5PP00189G

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