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-Structure paper
| タイトル | Mapping the absorption landscape of far-red Photosystem II. |
|---|---|
| ジャーナル・号・ページ | Nat Commun, Vol. 17, Issue 1, Year 2026 |
| 掲載日 | 2026年6月6日 |
著者 | Ho Fong Leong / Giovanni Consoli / Geoffry A Davis / Ben Hancox-Lachman / Kenta Renard / Fiazall Tufail / Lauren E Lee / Lucas Gautier / James W Murray / Andrea Fantuzzi / A William Rutherford / ![]() |
| PubMed 要旨 | Far-red light photoacclimation enables some cyanobacteria to survive in white-light-depleted environments by extending the red limit of photosynthesis. In far-red Photosystem II, paralogous subunits ...Far-red light photoacclimation enables some cyanobacteria to survive in white-light-depleted environments by extending the red limit of photosynthesis. In far-red Photosystem II, paralogous subunits replace their canonical counterparts, allowing the incorporation of some chlorophyll f molecules and one chlorophyll d that are red-shifted and spectrally distinct from the chlorophyll a manifold, and from each other. Here, we present a comparative study of far-red Photosystem II from Chroococcidiopsis thermalis PCC 7203 and Calothrix sp. NIES-3974. In C. thermalis, the cryo-electron microscopy structure reveals the far-red-exclusive subunit, PsbH2', which forms part of a chlorophyll f binding site. We also assign four chlorophyll f sites using sequence comparisons and electrostatic potential analyses. In Calothrix, psbH2' is absent, and the same analyses show that only two of these chlorophyll f sites are present. Comparative phylogenetic, structural, and spectroscopic analyses allow the assignment of specific wavelengths to all the red-shifted chlorophylls. This provides the framework needed to model excitation energy transfer in far-red Photosystem II, and to understand the conserved features that allow survival under far-red light. |
リンク | Nat Commun / PubMed:42248907 / PubMed Central |
| 手法 | EM (単粒子) |
| 解像度 | 2.17 - 2.33 Å |
| 構造データ | EMDB-55593, PDB-9t5t: EMDB-55594, PDB-9t5u: |
| 化合物 | ![]() ChemComp-OEX: ![]() ChemComp-FE2: ![]() ChemComp-CL: ![]() ChemComp-CLA: ![]() ChemComp-CL7: ![]() ChemComp-PHO: ![]() ChemComp-BCR: ![]() ChemComp-SQD: ![]() ChemComp-PL9: ![]() ChemComp-LMG: ![]() ChemComp-LMT: ![]() ChemComp-LHG: ![]()
ChemComp-F6C: ![]() ChemComp-DGD: ![]() ChemComp-BCT: ![]() ChemComp-HEM: ![]() ChemComp-HEC: ![]() ChemComp-HOH: |
| 由来 |
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キーワード | ELECTRON TRANSPORT / Chlorophyll f / photosystem II / FaRLiP |
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chroococcidiopsis thermalis pcc 7203 (バクテリア)
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