Regulation mechanism of direction of the proton translocation in proteorhodopsin
Project/Area Number |
16K18519
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Research Category |
Grant-in-Aid for Young Scientists (B)
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Allocation Type | Multi-year Fund |
Research Field |
Functional biochemistry
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Research Institution | Matsuyama University |
Principal Investigator |
TAMOGAMI JUN 松山大学, 薬学部, 助教 (30580089)
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Project Period (FY) |
2016-04-01 – 2019-03-31
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Project Status |
Completed (Fiscal Year 2018)
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Budget Amount *help |
¥4,160,000 (Direct Cost: ¥3,200,000、Indirect Cost: ¥960,000)
Fiscal Year 2018: ¥1,170,000 (Direct Cost: ¥900,000、Indirect Cost: ¥270,000)
Fiscal Year 2017: ¥1,560,000 (Direct Cost: ¥1,200,000、Indirect Cost: ¥360,000)
Fiscal Year 2016: ¥1,430,000 (Direct Cost: ¥1,100,000、Indirect Cost: ¥330,000)
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Keywords | 生体エネルギー変換 / 微生物型ロドプシン / レチナール / フォトサイクル / プロトン移動 |
Outline of Final Research Achievements |
The purpose of this study is to clarify the molecular mechanism of reverse of direction of the proton translocation under alkaline conditions in proteorhodopsin (PR), a light-driven proton pump from marine eubacteria. From the analysis of the photocycle and accompanying proton transfer under alkaline conditions, a parallel photocycle, during which a M-like photointermediate (Ma) is formed, was observed in addition to a photocycle at neutral pH. The photocycle via Ma at alkali pH was accompanied by the sequence and direction of the photoinduced proton transfer opposite to neutral pH. Moreover, we observed that the cytoplasmic transmembrane region in PR is already hydrophilic at the dark state through the bleach reaction by hydroxylamine.
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Academic Significance and Societal Importance of the Research Achievements |
本研究による結果から、微生物型ロドプシンのプロトン輸送の方向を決める機構は何かという本質的な問題を考える上での1つの役立つ情報が得られたものと考える。さらに、海洋でのエネルギー合成が主な役割であるとこれまで考えられてきたPRに別の機能も存在する可能性があるという問題も提起し、近年見つかってきている内向きプロトンポンプ型の微生物型ロドプシンの生理的な機能を考える上でも重要な情報を提供するものと考えている
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Report
(4 results)
Research Products
(20 results)
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[Journal Article] Interhelical interactions between D92 and C218 in the cytoplasmic domain regulate proton uptake upon N-decay in the proton transport of Acetabularia rhodopsin II2018
Author(s)
Tamogami Jun, Kikukawa Takashi, Ohkawa Keisuke, Ohsawa Noboru, Nara Toshifumi, Demura Makoto, Miyauchi Seiji, Kimura-Someya Tomomi, Shirouzu Mikako, Yokoyama Shigeyuki, Shimono Kazumi, Kamo Naoki
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Journal Title
Journal of Photochemistry and Photobiology B: Biology
Volume: 183
Pages: 35-45
DOI
Related Report
Peer Reviewed
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[Journal Article] Existence of two O-like intermediates in the photocycle of <i>Acetabularia</i> rhodopsin II, a light-driven proton pump from a marine alga2017
Author(s)
Tamogami, J., T. Kikukawa, T. Nara, M. Demura, T. Kimura-Someya, M. Shirouzu, S. Yokoyama, S. Miyauchi, K. Shimono and N. Kamo
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Journal Title
Biophysics and Physicobiology
Volume: 14
Issue: 0
Pages: 49-55
DOI
NAID
ISSN
2189-4779
Related Report
Peer Reviewed / Open Access / Int'l Joint Research
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[Journal Article] Photochemical characterization of actinorhodopsin and its functional existence in the natural host2016
Author(s)
Nakamura, S., Kikukawa, T., Tamogami, J., Kamiya, M., Aizawa, T., Hahn, M., Ihara, K., Kamo, N., Demura, M.
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Journal Title
BBA-BIOENERGETICS
Volume: 1857
Issue: 12
Pages: 1900-1908
DOI
NAID
Related Report
Peer Reviewed / Open Access / Int'l Joint Research / Acknowledgement Compliant
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[Presentation] Existence of two O intermediates in the photocycle of Acetabularia rhodopsin II, a light-driven algal proton pump2017
Author(s)
Jun Tamogami, Takashi Kikukawa, Toshifumi Nara, Makoto Demura, Tomomi Kimura-Someya, Mikako Shirouzu, Shigeyuki Yokoyama, Seiji Miyauchi, Kazumi Shimono, Naoki Kamo
Organizer
日本生物物理学会第55回年会
Related Report
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[Presentation] Role of the interaction between D92 and C218 in the proton transfer reaction in Acetabularia rhodopsin II2016
Author(s)
Jun Tamogami, Takashi Kikukawa, Keisuke Okawa, Noboru Ohsawa, Kohei Date, Toshifumi Nara, Makoto Demura, Tomomi Kimura-Someya, Mikako Shirouzu, Shigeyuki Yokoyama, Seiji Miyauchi, Kazumi Shimono, Naoki Kamo
Organizer
日本生物物理学会第54回年会
Place of Presentation
つくば国際会議場(茨城県つくば市)
Year and Date
2016-11-25
Related Report
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