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Research Article
Structure of the far-red light utilizing photosystem I of Acaryochloris marina
Keisuke Kawakami
RIKEN SPring-8 Center
Corresponding Author
ORCiD: https://orcid.org/0000-0002-1689-1819
Koji Yonekura
RIKEN SPring-8 Center
Corresponding Author
ORCiD: https://orcid.org/0000-0001-5520-4391
Yasuhiro Kashino
University of Hyogo
Corresponding Author
ORCiD: https://orcid.org/0000-0002-4278-9359
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- The author has confirmed that a statement listing potential conflicts of interest or lack thereof is included in the text.
Acaryochloris marina is one of the cyanobacteria that can use far-red light to drive photochemical reactions for oxygenic photosynthesis. Here, we report the structure of the photosystem I reaction center of A. marina determined by cryo-electron microscopy at 2.5 Å resolution. The structure reveals an arrangement of electron carriers and light-harvesting pigments different from other type I reaction centers. The paired chlorophyll, so-called special pair, of P740 is a dimer of chlorophyll d/d′ and the primary electron acceptor is pheophytin a, a metal-less chlorin different from the chlorophyll a common to all other type I reaction centers. Here we show the architecture of the photosystem I reaction center is composed of 11 subunits and identify key components that help explain how the low energy yield from far-red light is efficiently utilized for driving oxygenic photosynthesis.
Keywords
Acaryochloris marina, photosystem I, cryo-electron microscopy, pheophytin
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This is a preprint. It has not completed peer review.
Research Article
Structure of the far-red light utilizing photosystem I of Acaryochloris marina
Keisuke Kawakami
RIKEN SPring-8 Center
Corresponding Author
ORCiD: https://orcid.org/0000-0002-1689-1819
Koji Yonekura
RIKEN SPring-8 Center
Corresponding Author
ORCiD: https://orcid.org/0000-0001-5520-4391
Yasuhiro Kashino
University of Hyogo
Corresponding Author
ORCiD: https://orcid.org/0000-0002-4278-9359
Badges
Prescreen
This manuscript passed our Prescreen assessment
Complete author information
Appropriate declaration statements
Potential risks to human health
Prescreen
History
CURRENT STATUS: Posted
Version 2
Posted 21 Jan, 2021
No community comments so far
No comments provided
Metrics
Comments: 0
PDF Downloads: ...
HTML Views: ...
Subject Areas
Structural Biology
License:
This work is licensed under a CC BY 4.0 License. Read Full License
Declarations:
Declarations
- The author has confirmed that a statement listing potential conflicts of interest or lack thereof is included in the text.
Acaryochloris marina is one of the cyanobacteria that can use far-red light to drive photochemical reactions for oxygenic photosynthesis. Here, we report the structure of the photosystem I reaction center of A. marina determined by cryo-electron microscopy at 2.5 Å resolution. The structure reveals an arrangement of electron carriers and light-harvesting pigments different from other type I reaction centers. The paired chlorophyll, so-called special pair, of P740 is a dimer of chlorophyll d/d′ and the primary electron acceptor is pheophytin a, a metal-less chlorin different from the chlorophyll a common to all other type I reaction centers. Here we show the architecture of the photosystem I reaction center is composed of 11 subunits and identify key components that help explain how the low energy yield from far-red light is efficiently utilized for driving oxygenic photosynthesis.
Figure 1
Figure 2
Figure 3
Figure 4
Figure 5