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TitleCryo-EM structure of a photosystem I variant containing an unusual plastoquinone derivative in its electron transfer chain.
Journal, issue, pagesSci Adv, Vol. 10, Issue 48, Page eadp4937, Year 2024
Publish dateNov 29, 2024
AuthorsChristopher J Gisriel / Vasily Kurashov / David F Iwig / Brandon P Russell / David J Vinyard / Gary W Brudvig / John H Golbeck / K V Lakshmi /
PubMed AbstractPhotosystem I (PS I) is a light-driven oxidoreductase responsible for converting photons into chemical bond energy. Its application for renewable energy was revolutionized by the creation of the MenB ...Photosystem I (PS I) is a light-driven oxidoreductase responsible for converting photons into chemical bond energy. Its application for renewable energy was revolutionized by the creation of the MenB deletion (Δ) variant in the cyanobacterium sp. PCC 6803, in which phylloquinone is replaced by plastoquinone-9 with a low binding affinity. This permits its exchange with exogenous quinones covalently coupled to dihydrogen catalysts that bind with high affinity, thereby converting PS I into a stable solar fuel catalyst. Here, we reveal the 2.03-Å-resolution cryo-EM structure of a recent MenB variant of PS I. The quinones and their binding environment are analyzed in the context of previous biophysical data, thereby enabling a protocol to solve future PS I hybrids and constructs from this genetically tractable cyanobacterium.
External linksSci Adv / PubMed:39612342 / PubMed Central
MethodsEM (single particle)
Resolution2.03 Å
Structure data

43843

9au4

EMDB-43843, PDB-9au4:
Cryo-EM structure of a photosystem I variant containing an unusual plastoquinone derivative in its electron transfer chain
Method: EM (single particle) / Resolution: 2.03 Å

Chemicals

ChemComp-CLA:
CHLOROPHYLL A

PDB-1agd:
ANTAGONIST HIV-1 GAG PEPTIDES INDUCE STRUCTURAL CHANGES IN HLA B8-HIV-1 GAG PEPTIDE (GGKKKYKL-INDEX PEPTIDE)

ChemComp-SF4:
IRON/SULFUR CLUSTER

ChemComp-BCR:
BETA-CAROTENE

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

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

ChemComp-45D:
beta,beta-carotene-4,4'-dione

ChemComp-CL:
Unknown entry

ChemComp-ECH:
beta,beta-caroten-4-one

ChemComp-CA:
Unknown entry

ChemComp-EQ3:
(3'R)-3'-hydroxy-beta,beta-caroten-4-one

ChemComp-ZEX:
(1R,2S)-4-{(1E,3E,5E,7E,9E,11E,13E,15E,17E)-18-[(4S)-4-hydroxy-2,6,6-trimethylcyclohex-1-en-1-yl]-3,7,12,16-tetramethyloctadeca-1,3,5,7,9,11,13,15,17-nonaen-1-yl}-2,5,5-trimethylcyclohex-3-en-1-ol

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

ChemComp-DGD:
DIGALACTOSYL DIACYL GLYCEROL (DGDG)

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

ChemComp-HOH:
WATER

Source
  • synechocystis sp. pcc 6803 (bacteria)
KeywordsPHOTOSYNTHESIS / cyanobacteria / photosystem I / MenB / phylloquinone / plastoquinone / benzoquinone / naphthoquinone / redox potential

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