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TitleThe structure of a red-shifted photosystem I reveals a red site in the core antenna.
Journal, issue, pagesNat Commun, Vol. 11, Issue 1, Page 5279, Year 2020
Publish dateOct 19, 2020
AuthorsHila Toporik / Anton Khmelnitskiy / Zachary Dobson / Reece Riddle / Dewight Williams / Su Lin / Ryszard Jankowiak / Yuval Mazor /
PubMed AbstractPhotosystem I coordinates more than 90 chlorophylls in its core antenna while achieving near perfect quantum efficiency. Low energy chlorophylls (also known as red chlorophylls) residing in the ...Photosystem I coordinates more than 90 chlorophylls in its core antenna while achieving near perfect quantum efficiency. Low energy chlorophylls (also known as red chlorophylls) residing in the antenna are important for energy transfer dynamics and yield, however, their precise location remained elusive. Here, we construct a chimeric Photosystem I complex in Synechocystis PCC 6803 that shows enhanced absorption in the red spectral region. We combine Cryo-EM and spectroscopy to determine the structurefunction relationship in this red-shifted Photosystem I complex. Determining the structure of this complex reveals the precise architecture of the low energy site as well as large scale structural heterogeneity which is probably universal to all trimeric Photosystem I complexes. Identifying the structural elements that constitute red sites can expand the absorption spectrum of oxygenic photosynthetic and potentially modulate light harvesting efficiency.
External linksNat Commun / PubMed:33077842 / PubMed Central
MethodsEM (single particle)
Resolution3.1 Å
Structure data

20963

6uzv

EMDB-20963, PDB-6uzv:
The structure of a red shifted photosystem I complex
Method: EM (single particle) / Resolution: 3.1 Å

Chemicals

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

ChemComp-CL0:
CHLOROPHYLL A ISOMER / Chlorophyll a

ChemComp-CLA:
CHLOROPHYLL A / Chlorophyll a

ChemComp-PQN:
PHYLLOQUINONE / Phytomenadione

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

ChemComp-BCR:
BETA-CAROTENE / Β-Carotene

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

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

ChemComp-CA:
Unknown entry

Source
  • Synechocystis sp. PCC 6803 (bacteria)
  • synechocystis sp. (strain pcc 6803 / kazusa) (bacteria)
  • synechocystis sp. pcc 6803 substr. kazusa (bacteria)
KeywordsPHOTOSYNTHESIS / Photosystem / Antenna / Chlorophyll / Membrane

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