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Structure paper

TitleStructural basis for assembly and function of a diatom photosystem I-light-harvesting supercomplex.
Journal, issue, pagesNat Commun, Vol. 11, Issue 1, Page 2481, Year 2020
Publish dateMay 18, 2020
AuthorsRyo Nagao / Koji Kato / Kentaro Ifuku / Takehiro Suzuki / Minoru Kumazawa / Ikuo Uchiyama / Yasuhiro Kashino / Naoshi Dohmae / Seiji Akimoto / Jian-Ren Shen / Naoyuki Miyazaki / Fusamichi Akita /
PubMed AbstractPhotosynthetic light-harvesting complexes (LHCs) play a pivotal role in collecting solar energy for photochemical reactions in photosynthesis. One of the major LHCs are fucoxanthin chlorophyll a/c- ...Photosynthetic light-harvesting complexes (LHCs) play a pivotal role in collecting solar energy for photochemical reactions in photosynthesis. One of the major LHCs are fucoxanthin chlorophyll a/c-binding proteins (FCPs) present in diatoms, a group of organisms having important contribution to the global carbon cycle. Here, we report a 2.40-Å resolution structure of the diatom photosystem I (PSI)-FCPI supercomplex by cryo-electron microscopy. The supercomplex is composed of 16 different FCPI subunits surrounding a monomeric PSI core. Each FCPI subunit showed different protein structures with different pigment contents and binding sites, and they form a complicated pigment-protein network together with the PSI core to harvest and transfer the light energy efficiently. In addition, two unique, previously unidentified subunits were found in the PSI core. The structure provides numerous insights into not only the light-harvesting strategy in diatom PSI-FCPI but also evolutionary dynamics of light harvesters among oxyphototrophs.
External linksNat Commun / PubMed:32424145 / PubMed Central
MethodsEM (single particle)
Resolution2.4 - 2.6 Å
Structure data

0834

6l4t

EMDB-0834, PDB-6l4t:
Structure of the peripheral FCPI from diatom
Method: EM (single particle) / Resolution: 2.6 Å

0835

6l4u

EMDB-0835, PDB-6l4u:
Structure of the PSI-FCPI supercomplex from diatom
Method: EM (single particle) / Resolution: 2.4 Å

Chemicals

ChemComp-CLA:
CHLOROPHYLL A / Chlorophyll a

ChemComp-KC1:
Chlorophyll c1 / Chlorophyll c

ChemComp-DD6:
(3S,3'R,5R,6S,7cis)-7',8'-didehydro-5,6-dihydro-5,6-epoxy-beta,beta-carotene-3,3'-diol / Diadinoxanthin

ChemComp-A86:
(3S,3'S,5R,5'R,6S,6'R,8'R)-3,5'-dihydroxy-8-oxo-6',7'-didehydro-5,5',6,6',7,8-hexahydro-5,6-epoxy-beta,beta-caroten-3'- / Fucoxanthin

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

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

ChemComp-LMT:
DODECYL-BETA-D-MALTOSIDE / detergent*YM

ChemComp-HOH:
WATER / Water

ChemComp-CL0:
CHLOROPHYLL A ISOMER / Chlorophyll a

ChemComp-PQN:
PHYLLOQUINONE / Phytomenadione

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

ChemComp-BCR:
BETA-CAROTENE / Β-Carotene

Source
  • chaetoceros gracilis (Diatom)
KeywordsELECTRON TRANSPORT / Photosystem I

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