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TitleCryo-EM structure of a functional monomeric Photosystem I from Thermosynechococcus elongatus reveals red chlorophyll cluster.
Journal, issue, pagesCommun Biol, Vol. 4, Issue 1, Page 304, Year 2021
Publish dateMar 8, 2021
AuthorsOrkun Çoruh / Anna Frank / Hideaki Tanaka / Akihiro Kawamoto / Eithar El-Mohsnawy / Takayuki Kato / Keiichi Namba / Christoph Gerle / Marc M Nowaczyk / Genji Kurisu /
PubMed AbstractA high-resolution structure of trimeric cyanobacterial Photosystem I (PSI) from Thermosynechococcus elongatus was reported as the first atomic model of PSI almost 20 years ago. However, the monomeric ...A high-resolution structure of trimeric cyanobacterial Photosystem I (PSI) from Thermosynechococcus elongatus was reported as the first atomic model of PSI almost 20 years ago. However, the monomeric PSI structure has not yet been reported despite long-standing interest in its structure and extensive spectroscopic characterization of the loss of red chlorophylls upon monomerization. Here, we describe the structure of monomeric PSI from Thermosynechococcus elongatus BP-1. Comparison with the trimer structure gave detailed insights into monomerization-induced changes in both the central trimerization domain and the peripheral regions of the complex. Monomerization-induced loss of red chlorophylls is assigned to a cluster of chlorophylls adjacent to PsaX. Based on our findings, we propose a role of PsaX in the stabilization of red chlorophylls and that lipids of the surrounding membrane present a major source of thermal energy for uphill excitation energy transfer from red chlorophylls to P700.
External linksCommun Biol / PubMed:33686186 / PubMed Central
MethodsEM (single particle) / X-ray diffraction
Resolution3.2 - 6.5 Å
Structure data

0977

6lu1

EMDB-0977, PDB-6lu1:
Cyanobacterial PSI Monomer from T. elongatus by Single Particle CRYO-EM at 3.2 A Resolution
Method: EM (single particle) / Resolution: 3.2 Å

PDB-7bw2:
Crystal Structure of Cyanobacterial PSI Monomer from T.elongatus at 6.5 A Resolution
Method: X-RAY DIFFRACTION / Resolution: 6.5 Å

Chemicals

ChemComp-CLA:
CHLOROPHYLL A

ChemComp-PQN:
PHYLLOQUINONE

ChemComp-BCR:
BETA-CAROTENE

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

ChemComp-SF4:
IRON/SULFUR CLUSTER

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

ChemComp-HOH:
WATER

Source
  • thermosynechococcus elongatus bp-1 (bacteria)
  • thermosynechococcus elongatus (strain bp-1) (bacteria)
KeywordsMEMBRANE PROTEIN / monomer / complex / photosystem / photosynthesis

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