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TitleStructure of the far-red light utilizing photosystem I of Acaryochloris marina.
Journal, issue, pagesNat Commun, Vol. 12, Issue 1, Page 2333, Year 2021
Publish dateApr 20, 2021
AuthorsTasuku Hamaguchi / Keisuke Kawakami / Kyoko Shinzawa-Itoh / Natsuko Inoue-Kashino / Shigeru Itoh / Kentaro Ifuku / Eiki Yamashita / Kou Maeda / Koji Yonekura / Yasuhiro Kashino /
PubMed AbstractAcaryochloris marina is one of the cyanobacterial species that can use far-red light to drive photochemical reactions for oxygenic photosynthesis. Here, we report the structure of A. marina ...Acaryochloris marina is one of the cyanobacterial species that can use far-red light to drive photochemical reactions for oxygenic photosynthesis. Here, we report the structure of A. marina photosystem I (PSI) reaction center, determined by cryo-electron microscopy at 2.58 Å resolution. The structure reveals an arrangement of electron carriers and light-harvesting pigments distinct from other type I reaction centers. The paired chlorophyll, or special pair (also referred to as P740 in this case), is a dimer of chlorophyll d and its epimer chlorophyll d'. The primary electron acceptor is pheophytin a, a metal-less chlorin. We show the architecture of this PSI reaction center is composed of 11 subunits and we identify key components that help explain how the low energy yield from far-red light is efficiently utilized for driving oxygenic photosynthesis.
External linksNat Commun / PubMed:33879791 / PubMed Central
MethodsEM (single particle)
Resolution2.5 Å
Structure data

30420

7coy

EMDB-30420, PDB-7coy:
Structure of the far-red light utilizing photosystem I of Acaryochloris marina
Method: EM (single particle) / Resolution: 2.5 Å

Chemicals

ChemComp-G9R:
CHLOROPHYLL D ISOMER

ChemComp-PHO:
PHEOPHYTIN A / Pheophytin

ChemComp-CL7:
CHLOROPHYLL D / Chlorophyll d


ChemComp, No image

ChemComp-UNL:
Unknown ligand

ChemComp-LHG:
1,2-DIPALMITOYL-PHOSPHATIDYL-GLYCEROLE / phospholipid*YM / Phosphatidylglycerol

ChemComp-PQN:
PHYLLOQUINONE / Phytomenadione

ChemComp-SF4:
IRON/SULFUR CLUSTER / Iron–sulfur cluster

ChemComp-LMG:
1,2-DISTEAROYL-MONOGALACTOSYL-DIGLYCERIDE

ChemComp-HOH:
WATER / Water

Source
  • Acaryochloris marina (bacteria)
  • acaryochloris marina mbic11017 (bacteria)
  • acaryochloris marina mbic110017 (bacteria)
  • acaryochloris marina mbic 11017 (bacteria)
KeywordsPHOTOSYNTHESIS / Photosystem I / Acaryochloris marina / Light-harvesting / Chlorophyll d

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