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-Structure paper
Title | Structural basis for the adaptation and function of chlorophyll f in photosystem I. |
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Journal, issue, pages | Nat Commun, Vol. 11, Issue 1, Page 238, Year 2020 |
Publish date | Jan 13, 2020 |
Authors | Koji Kato / Toshiyuki Shinoda / Ryo Nagao / Seiji Akimoto / Takehiro Suzuki / Naoshi Dohmae / Min Chen / Suleyman I Allakhverdiev / Jian-Ren Shen / Fusamichi Akita / Naoyuki Miyazaki / Tatsuya Tomo / |
PubMed Abstract | Chlorophylls (Chl) play pivotal roles in energy capture, transfer and charge separation in photosynthesis. Among Chls functioning in oxygenic photosynthesis, Chl f is the most red-shifted type first ...Chlorophylls (Chl) play pivotal roles in energy capture, transfer and charge separation in photosynthesis. Among Chls functioning in oxygenic photosynthesis, Chl f is the most red-shifted type first found in a cyanobacterium Halomicronema hongdechloris. The location and function of Chl f in photosystems are not clear. Here we analyzed the high-resolution structures of photosystem I (PSI) core from H. hongdechloris grown under white or far-red light by cryo-electron microscopy. The structure showed that, far-red PSI binds 83 Chl a and 7 Chl f, and Chl f are associated at the periphery of PSI but not in the electron transfer chain. The appearance of Chl f is well correlated with the expression of PSI genes induced under far-red light. These results indicate that Chl f functions to harvest the far-red light and enhance uphill energy transfer, and changes in the gene sequences are essential for the binding of Chl f. |
External links | Nat Commun / PubMed:31932639 / PubMed Central |
Methods | EM (single particle) |
Resolution | 2.35 - 2.41 Å |
Structure data | |
Chemicals | ChemComp-CL0: ChemComp-CLA: ChemComp-PQN: ChemComp-SF4: ChemComp-BCR: ChemComp-LHG: ChemComp-LMT: ChemComp-LMG:
ChemComp-UNL: ChemComp-CA: ChemComp-HOH:
ChemComp-F6C: |
Source |
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Keywords | ELECTRON TRANSPORT / Photosystem I |