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Structure paper

TitleStructural basis for energy and electron transfer of the photosystem I-IsiA-flavodoxin supercomplex.
Journal, issue, pagesNat Plants, Vol. 6, Issue 2, Page 167-176, Year 2020
Publish dateFeb 10, 2020
AuthorsPeng Cao / Duanfang Cao / Long Si / Xiaodong Su / Lijin Tian / Wenrui Chang / Zhenfeng Liu / Xinzheng Zhang / Mei Li /
PubMed AbstractUnder iron-deficiency stress, which occurs frequently in natural aquatic environments, cyanobacteria reduce the amount of iron-enriched proteins, including photosystem I (PSI) and ferredoxin (Fd), ...Under iron-deficiency stress, which occurs frequently in natural aquatic environments, cyanobacteria reduce the amount of iron-enriched proteins, including photosystem I (PSI) and ferredoxin (Fd), and upregulate the expression of iron-stress-induced proteins A and B (IsiA and flavodoxin (Fld)). Multiple IsiAs function as the peripheral antennae that encircle the PSI core, whereas Fld replaces Fd as the electron receptor of PSI. Here, we report the structures of the PSI-IsiA-Fld and PSI-IsiA supercomplexes from Synechococcus sp. PCC 7942, revealing features that are different from the previously reported PSI structures, and a sophisticated pigment network that involves previously unobserved pigment molecules. Spectroscopic results demonstrated that IsiAs are efficient light harvesters for PSI. Three Flds bind symmetrically to the trimeric PSI core-we reveal the detailed interaction and the electron transport path between PSI and Fld. Our results provide a structural basis for understanding the mechanisms of light harvesting, energy transfer and electron transport of cyanobacterial PSI under stressed conditions.
External linksNat Plants / PubMed:32042157
MethodsEM (single particle)
Resolution2.9 - 3.3 Å
Structure data

9994

6kif

EMDB-9994, PDB-6kif:
Structure of cyanobacterial photosystem I-IsiA-flavodoxin supercomplex
Method: EM (single particle) / Resolution: 3.3 Å

9995

6kig

EMDB-9995, PDB-6kig:
Structure of cyanobacterial photosystem I-IsiA supercomplex
Method: EM (single particle) / Resolution: 2.9 Å

Chemicals

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

ChemComp-LMU:
DODECYL-ALPHA-D-MALTOSIDE / detergent*YM

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

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

ChemComp-FMN:
FLAVIN MONONUCLEOTIDE / Flavin mononucleotide

ChemComp-HOH:
WATER / Water

Source
  • Synechococcus elongatus PCC 7942 (bacteria)
  • synechococcus elongatus (strain pcc 7942) (bacteria)
KeywordsPHOTOSYNTHESIS / Photosystem / Antenna / Chlorophyll-binding protein / Membrane protein / iron stress-induced protein A / Flavodoxin

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