Color-Discriminating Retinal Configurations of Sensory RhodopsinI by Photo-Irradiation Solid-State NMR Spectroscopy

SRI (sensory rhodopsinI) can discriminate multiple colors for the attractant and repellent phototaxis. Studies aimed at revealing the color-dependent mechanism show that SRI is a challenging system not only in photobiology but also in photochemistry. During the photoreaction of SRI, an M-intermediat...

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Veröffentlicht in:Angewandte Chemie International Edition 2014-07, Vol.53 (27), p.6960-6964
Hauptverfasser: Yomoda, Hiroki, Makino, Yoshiteru, Tomonaga, Yuya, Hidaka, Tetsurou, Kawamura, Izuru, Okitsu, Takashi, Wada, Akimori, Sudo, Yuki, Naito, Akira
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container_end_page 6964
container_issue 27
container_start_page 6960
container_title Angewandte Chemie International Edition
container_volume 53
creator Yomoda, Hiroki
Makino, Yoshiteru
Tomonaga, Yuya
Hidaka, Tetsurou
Kawamura, Izuru
Okitsu, Takashi
Wada, Akimori
Sudo, Yuki
Naito, Akira
description SRI (sensory rhodopsinI) can discriminate multiple colors for the attractant and repellent phototaxis. Studies aimed at revealing the color-dependent mechanism show that SRI is a challenging system not only in photobiology but also in photochemistry. During the photoreaction of SRI, an M-intermediate (attractant) transforms into a P-intermediate (repellent) by absorbing blue light. Consequently, SRI then cycles back to the G-state. The photoreactions were monitored with the 13CNMR signals of [20-13C]retnal-SrSRI using insitu photo-irradiation solid-state NMR spectroscopy. The M-intermediate was trapped at -40°C by illumination at 520nm. It was transformed into the P-intermediate by subsequent illumination at 365nm. These results reveal that the G-state could be directly transformed to the P-intermediate by illumination at 365nm. Thus, the stationary trapped M- and P-intermediates are responsible for positive and negative phototaxis, respectively.
doi_str_mv 10.1002/anie.201309258
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subjects Absorption
Illumination
Irradiation
NMR spectroscopy
Photochemistry
Repellents
Switches
Transforms
title Color-Discriminating Retinal Configurations of Sensory RhodopsinI by Photo-Irradiation Solid-State NMR Spectroscopy
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