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-Structure paper
| タイトル | Structure of a stripped-down and tuned-up far-red phycobilisome. |
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| ジャーナル・号・ページ | Commun Biol, Vol. 8, Issue 1, Page 907, Year 2025 |
| 掲載日 | 2025年6月10日 |
著者 | Giovanni Consoli / Ho Fong Leong / Geoffry A Davis / Tom Richardson / Aiysha McInnes / James W Murray / Andrea Fantuzzi / A William Rutherford / ![]() |
| PubMed 要旨 | A diverse subset of cyanobacteria can transiently modify their photosynthetic machinery during far-red light photoacclimation to drive photosynthesis with less energetic photons (700 nm-800 nm). ...A diverse subset of cyanobacteria can transiently modify their photosynthetic machinery during far-red light photoacclimation to drive photosynthesis with less energetic photons (700 nm-800 nm). To achieve this, all the main light-driven components of the photosynthetic apparatus, including their allophycocyanin antenna, are replaced with red-shifted paralogues. Recent studies based on the structure of an incomplete complex provided some insights into the tuning of the far-red phycobiliproteins. Here, we solved the structure of the intact bicylindrical allophycocyanin complex from the cyanobacterium Chroococcidiopsis thermalis PCC 7203 at a resolution of 2.51 Å determined by Cryo-electron microscopy single particle analysis. A comparison between conserved structural features in far-red and white light allophycocyanin cores provides insight on the evolutionary adaptations needed to optimize excitation energy transfer in the far-red light adapted photosynthetic apparatus. The reduction in antenna size in far-red photosynthesis suggests a need to optimize membrane packing to increase the number of photosystems and tune the ratio between chlorophyll f molecules and bilin pigments, while the wider spread in the absorption range of the bilins suggests faster and more efficient excitation energy transfer to far-red Photosystem II by limiting backflow of excitation from the reaction centres to the far-red bilin pigments. |
リンク | Commun Biol / PubMed:40494956 / PubMed Central |
| 手法 | EM (単粒子) |
| 解像度 | 2.51 Å |
| 構造データ | EMDB-52573, PDB-9i1r: |
| 化合物 | ![]() ChemComp-CYC: ![]() ChemComp-HOH: |
| 由来 |
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キーワード | PHOTOSYNTHESIS / Phycobilisome / Allophycocyanin / Complex |
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Chroococcidiopsis thermalis (バクテリア)
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