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Research Article
Keisuke Kawakami
RIKEN SPring-8 Center
Corresponding Author
ORCiD: https://orcid.org/0000-0002-1689-1819
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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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- HamaguchiSIRev.docx
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This is a preprint, a preliminary version of a manuscript that has not completed peer review at a journal. Research Square does not conduct peer review prior to posting preprints. The posting of a preprint on this server should not be interpreted as an endorsement of its validity or suitability for dissemination as established information or for guiding clinical practice.
Research Article
Keisuke Kawakami
RIKEN SPring-8 Center
Corresponding Author
ORCiD: https://orcid.org/0000-0002-1689-1819
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
This is a list of supplementary files associated with this preprint. Click to download.
- HamaguchiSIRev.docx
Supplementary Information
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