Primary Citation of Related Structures: 6KMW, 6KMX
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 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.
Organizational Affiliation:
Research Institute for Interdisciplinary Science and Graduate School of Natural Science and Technology, Okayama University, Okayama, 700-8530, Japan.
Faculty of Science, Tokyo University of Science, Tokyo, 162-8601, Japan.
Graduate School of Science, Kobe University, Kobe, 657-8501, Japan.
Biomolecular Characterization Unit, RIKEN Center for Sustainable Resource Science, Wako, Japan.
School of Life and Environmental Sciences, University of Sydney, Sydney, Australia.
K.A. Timiryazev Institute of Plant Physiology RAS, Moscow, Russia.
Institute of Basic Biological Problems RAS, Pushchino, Moscow Region, Russia.
M.V. Lomonosov Moscow State University, Moscow, Russia.
Moscow Institute of Physics and Technology, Dolgoprudny, Moscow region, Russia.
Institute of Molecular Biology and Biotechnology ANAS, -Baku, Azerbaijan.
Research Institute for Interdisciplinary Science and Graduate School of Natural Science and Technology, Okayama University, Okayama, 700-8530, Japan. shen@okayama-u.ac.jp.
Research Institute for Interdisciplinary Science and Graduate School of Natural Science and Technology, Okayama University, Okayama, 700-8530, Japan. fusamichi_a@okayama-u.ac.jp.
Japan Science and Technology Agency, PRESTO, Saitama, 332-0012, Japan. fusamichi_a@okayama-u.ac.jp.
Institute for Protein Research, Laboratory of Protein Synthesis and Expression, Osaka University, Osaka, 565-0871, Japan. naomiyazaki@tara.tsukuba.ac.jp.
Life Science Center for Survival Dynamics, Tsukuba Advanced Research Alliance, University of Tsukuba, Ibaraki, 305-8577, Japan. naomiyazaki@tara.tsukuba.ac.jp.
Faculty of Science, Tokyo University of Science, Tokyo, 162-8601, Japan. tomo@rs.tus.ac.jp.
BE [auth aI] FE [auth aL] FJ [auth bL] GJ [auth bL] HJ [auth bL]
BE [auth aI], FE [auth aL], FJ [auth bL], GJ [auth bL], HJ [auth bL], IN [auth cI], JN [auth cI], OE [auth aL], ON [auth cL], PE [auth aL], QE [auth aL], SI [auth bI], WI [auth bL], XN [auth cL], YN [auth cL]
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