Structural basis for the adaptation and function of chlorophyll f in photosystem I

Author:

Kato Koji,Shinoda Toshiyuki,Nagao Ryo,Akimoto SeijiORCID,Suzuki Takehiro,Dohmae Naoshi,Chen MinORCID,Allakhverdiev Suleyman I.ORCID,Shen Jian-RenORCID,Akita FusamichiORCID,Miyazaki NaoyukiORCID,Tomo TatsuyaORCID

Abstract

AbstractChlorophylls (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.

Funder

MEXT | Japan Society for the Promotion of Science

Russian Foundation for Basic Research

MEXT | JST | Precursory Research for Embryonic Science and Technology

Japan Agency for Medical Research and Development

Publisher

Springer Science and Business Media LLC

Subject

General Physics and Astronomy,General Biochemistry, Genetics and Molecular Biology,General Chemistry

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