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.
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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