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-Structure paper
タイトル | The structure of photosystem I from a high-light-tolerant cyanobacteria. |
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ジャーナル・号・ページ | Elife, Vol. 10, Year 2021 |
掲載日 | 2021年8月26日 |
著者 | Zachary Dobson / Safa Ahad / Jackson Vanlandingham / Hila Toporik / Natalie Vaughn / Michael Vaughn / Dewight Williams / Michael Reppert / Petra Fromme / Yuval Mazor / |
PubMed 要旨 | Photosynthetic organisms have adapted to survive a myriad of extreme environments from the earth's deserts to its poles, yet the proteins that carry out the light reactions of photosynthesis are ...Photosynthetic organisms have adapted to survive a myriad of extreme environments from the earth's deserts to its poles, yet the proteins that carry out the light reactions of photosynthesis are highly conserved from the cyanobacteria to modern day crops. To investigate adaptations of the photosynthetic machinery in cyanobacteria to excessive light stress, we isolated a new strain of cyanobacteria, 0216, from the extreme light environment of the Sonoran Desert. Here we report the biochemical characterization and the 2.7 Å resolution structure of trimeric photosystem I from this high-light-tolerant cyanobacterium. The structure shows a new conformation of the PsaL C-terminus that supports trimer formation of cyanobacterial photosystem I. The spectroscopic analysis of this photosystem I revealed a decrease in far-red absorption, which is attributed to a decrease in the number of long- wavelength chlorophylls. Using these findings, we constructed two chimeric PSIs in sp. PCC 6803 demonstrating how unique structural features in photosynthetic complexes can change spectroscopic properties, allowing organisms to thrive under different environmental stresses. |
リンク | Elife / PubMed:34435952 / PubMed Central |
手法 | EM (単粒子) |
解像度 | 2.7 Å |
構造データ | EMDB-21320, PDB-6vpv: |
化合物 | ChemComp-CL0: ChemComp-CLA: ChemComp-PQN: ChemComp-SF4: ChemComp-BCR: ChemComp-LHG: ChemComp-LMG: ChemComp-SQD: |
由来 |
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キーワード | PHOTOSYNTHESIS / Photosystem I / Membrane Protein / PSI |