Rhodopsins are photoreceptive proteins using light to drive a plethora of biological functions such as vision, proton and ion pumping, cation and anion channeling, gene and enzyme regulation. Here we combine organic synthesis, NMR structural studies and photochemical characterization to show that it is possible to prepare a fully synthetic mimic of rhodopsin photoreceptors. More specifically, we conjugate a bile acid binding protein with a synthetic mimic of the rhodopsin protonated Schiff base chromophore, to achieve a covalent complex featuring an unnatural protein host, photoswitch and photoswitch-protein linkage with a reverse orientation. We show that, in spite of its molecular-level diversity, light irradiation of the prepared mimic fuels a photochromic cycle driven by sequential photochemical and thermal Z/E isomerizations reminiscent of the photocycles of microbial rhodopsins.

Pagano, K., Paolino, M., Fusi, S., Zanirato, V., Trapella, C., Giuliani, G., et al. (2019). Bile Acid Binding Protein Functionalization Leads to a Fully Synthetic Rhodopsin Mimic. THE JOURNAL OF PHYSICAL CHEMISTRY LETTERS, 10(9), 2235-2243 [10.1021/acs.jpclett.9b00210].

Bile Acid Binding Protein Functionalization Leads to a Fully Synthetic Rhodopsin Mimic

Paolino, Marco;Fusi, Stefania;Giuliani, Germano;Cappelli, Andrea;Olivucci, Massimo
2019-01-01

Abstract

Rhodopsins are photoreceptive proteins using light to drive a plethora of biological functions such as vision, proton and ion pumping, cation and anion channeling, gene and enzyme regulation. Here we combine organic synthesis, NMR structural studies and photochemical characterization to show that it is possible to prepare a fully synthetic mimic of rhodopsin photoreceptors. More specifically, we conjugate a bile acid binding protein with a synthetic mimic of the rhodopsin protonated Schiff base chromophore, to achieve a covalent complex featuring an unnatural protein host, photoswitch and photoswitch-protein linkage with a reverse orientation. We show that, in spite of its molecular-level diversity, light irradiation of the prepared mimic fuels a photochromic cycle driven by sequential photochemical and thermal Z/E isomerizations reminiscent of the photocycles of microbial rhodopsins.
Pagano, K., Paolino, M., Fusi, S., Zanirato, V., Trapella, C., Giuliani, G., et al. (2019). Bile Acid Binding Protein Functionalization Leads to a Fully Synthetic Rhodopsin Mimic. THE JOURNAL OF PHYSICAL CHEMISTRY LETTERS, 10(9), 2235-2243 [10.1021/acs.jpclett.9b00210].
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11365/1071968