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-Structure paper
タイトル | Structural adaptations of photosynthetic complex I enable ferredoxin-dependent electron transfer. |
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ジャーナル・号・ページ | Science, Vol. 363, Issue 6424, Page 257-260, Year 2019 |
掲載日 | 2019年1月18日 |
著者 | Jan M Schuller / James A Birrell / Hideaki Tanaka / Tsuyoshi Konuma / Hannes Wulfhorst / Nicholas Cox / Sandra K Schuller / Jacqueline Thiemann / Wolfgang Lubitz / Pierre Sétif / Takahisa Ikegami / Benjamin D Engel / Genji Kurisu / Marc M Nowaczyk / |
PubMed 要旨 | Photosynthetic complex I enables cyclic electron flow around photosystem I, a regulatory mechanism for photosynthetic energy conversion. We report a 3.3-angstrom-resolution cryo-electron microscopy ...Photosynthetic complex I enables cyclic electron flow around photosystem I, a regulatory mechanism for photosynthetic energy conversion. We report a 3.3-angstrom-resolution cryo-electron microscopy structure of photosynthetic complex I from the cyanobacterium The model reveals structural adaptations that facilitate binding and electron transfer from the photosynthetic electron carrier ferredoxin. By mimicking cyclic electron flow with isolated components in vitro, we demonstrate that ferredoxin directly mediates electron transfer between photosystem I and complex I, instead of using intermediates such as NADPH (the reduced form of nicotinamide adenine dinucleotide phosphate). A large rate constant for association of ferredoxin to complex I indicates efficient recognition, with the protein subunit NdhS being the key component in this process. |
リンク | Science / PubMed:30573545 |
手法 | EM (単粒子) / X線回折 |
解像度 | 1.9 - 3.34 Å |
構造データ | EMDB-0281, PDB-6hum: PDB-6a7k: |
化合物 | ChemComp-ACY: ChemComp-HOH: ChemComp-BCR: ChemComp-LMG: ChemComp-SF4: |
由来 |
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キーワード | ELECTRON TRANSPORT / NADH dehydrogenase-like complex / NDH-1 / cyclic electron flow (CEF) / Ferredoxin / PROTON TRANSPORT / Respiratory Complex / Cyclic electron flow / Complex I / Membrane protein complex |