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TitleStructural and functional insights into the tetrameric photosystem I from heterocyst-forming cyanobacteria.
Journal, issue, pagesNat Plants, Vol. 5, Issue 10, Page 1087-1097, Year 2019
Publish dateOct 8, 2019
AuthorsLvqin Zheng / Yanbing Li / Xiying Li / Qinglu Zhong / Ningning Li / Kun Zhang / Yuebin Zhang / Huiying Chu / Chengying Ma / Guohui Li / Jindong Zhao / Ning Gao /
PubMed AbstractTwo large protein-cofactor complexes, photosystem I and photosystem II, are the central components of photosynthesis in the thylakoid membranes. Here, we report the 2.37-Å structure of a tetrameric ...Two large protein-cofactor complexes, photosystem I and photosystem II, are the central components of photosynthesis in the thylakoid membranes. Here, we report the 2.37-Å structure of a tetrameric photosystem I complex from a heterocyst-forming cyanobacterium Anabaena sp. PCC 7120. Four photosystem I monomers, organized in a dimer of dimer, form two distinct interfaces that are largely mediated by specifically orientated polar lipids, such as sulfoquinovosyl diacylglycerol. The structure depicts a more closely connected network of chlorophylls across monomer interfaces than those seen in trimeric PSI from thermophilic cyanobacteria, possibly allowing a more efficient energy transfer between monomers. Our physiological data also revealed a functional link of photosystem I oligomerization to cyclic electron flow and thylakoid membrane organization.
External linksNat Plants / PubMed:31595062
MethodsEM (single particle)
Resolution2.37 Å
Structure data

9918

6k61

EMDB-9918, PDB-6k61:
Cryo-EM structure of the tetrameric photosystem I from a heterocyst-forming cyanobacterium Anabaena sp. PCC7120
Method: EM (single particle) / Resolution: 2.37 Å

Chemicals

ChemComp-CL0:
CHLOROPHYLL A ISOMER

ChemComp-CLA:
CHLOROPHYLL A

ChemComp-PQN:
PHYLLOQUINONE

ChemComp-SF4:
IRON/SULFUR CLUSTER

ChemComp-BCR:
BETA-CAROTENE

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

ChemComp-SQD:
1,2-DI-O-ACYL-3-O-[6-DEOXY-6-SULFO-ALPHA-D-GLUCOPYRANOSYL]-SN-GLYCEROL

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

Source
  • nostoc sp. pcc 7120 (bacteria)
KeywordsPHOTOSYNTHESIS / Photosystem I / PSI / PCC7120

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