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-Structure paper
| タイトル | Locating the missing chlorophylls f in far-red photosystem I. |
|---|---|
| ジャーナル・号・ページ | Science, Vol. 390, Issue 6778, Page eado6830, Year 2025 |
| 掲載日 | 2025年12月11日 |
著者 | Giovanni Consoli / Fiazall Tufail / Ho Fong Leong / Stefania Viola / Geoffry A Davis / Nicholas Rew / Daniel Medranda / Michael Hofer / Paul Simpson / Marco Sandrin / Benoit Chachuat / Jenny Nelson / Thomas Renger / James W Murray / Andrea Fantuzzi / A William Rutherford / ![]() |
| PubMed 要旨 | The discovery of chlorophyll f-containing photosystems, with their long-wavelength photochemistry, represented a distinct, low-energy paradigm for oxygenic photosynthesis. Structural studies on ...The discovery of chlorophyll f-containing photosystems, with their long-wavelength photochemistry, represented a distinct, low-energy paradigm for oxygenic photosynthesis. Structural studies on chlorophyll f-containing photosystem I could identify some chlorophyll f sites, but none among the photochemically active pigments, and thus concluded that chlorophyll f plays no photochemical role. Here, we report two cryo-electron microscopy structures of far-red photosystem I from PCC 7203, allowing the assignment of eight chlorophyll f molecules, including the redox active A. Simulations of absorption difference spectra induced by charge separation indicated that the experimental spectra can be reproduced only by considering the presence of a chlorophyll f at the A site. The chlorophyll f locations, wavelength assignments, and conserved far-red-specific residues provide functional insights for efficient use of long-wavelength photons. |
リンク | Science / PubMed:41066538 |
| 手法 | EM (単粒子) |
| 解像度 | 1.89 - 2.01 Å |
| 構造データ | EMDB-50063, PDB-9eys: EMDB-52762, PDB-9i9l: |
| 化合物 | ![]() ChemComp-CL0: ![]()
ChemComp-F6C: ![]() ChemComp-CLA: ![]() ChemComp-PQN: ![]() ChemComp-SF4: ![]() ChemComp-BCR: ![]() ChemComp-LHG: ![]() ChemComp-LMT: ![]() ChemComp-LMG: ![]() ChemComp-LFA: ![]() ChemComp-CA: ![]() ChemComp-HOH: |
| 由来 |
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キーワード | PHOTOSYNTHESIS / Chlorophyll f / Photosystem I / Far-red / cyanobacteria |
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C. thermalis (バクテリア)
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