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TitleStructural adaptations of photosynthetic complex I enable ferredoxin-dependent electron transfer.
Journal, issue, pagesScience, Vol. 363, Issue 6424, Page 257-260, Year 2019
Publish dateJan 18, 2019
AuthorsJan M Schuller / James A Birrell / Hideaki Tanaka / Tsuyoshi Konuma / Hannes Wulfhorst / Nicholas Cox / Sandra K Schuller / Jacqueline Thiemann / Wolfgang Lubitz / Pierre Sétif / Takahisa Ikegami / Benjamin D Engel / Genji Kurisu / Marc M Nowaczyk /
PubMed AbstractPhotosynthetic complex I enables cyclic electron flow around photosystem I, a regulatory mechanism for photosynthetic energy conversion. We report a 3.3-angstrom-resolution cryo-electron microscopy ...Photosynthetic complex I enables cyclic electron flow around photosystem I, a regulatory mechanism for photosynthetic energy conversion. We report a 3.3-angstrom-resolution cryo-electron microscopy structure of photosynthetic complex I from the cyanobacterium The model reveals structural adaptations that facilitate binding and electron transfer from the photosynthetic electron carrier ferredoxin. By mimicking cyclic electron flow with isolated components in vitro, we demonstrate that ferredoxin directly mediates electron transfer between photosystem I and complex I, instead of using intermediates such as NADPH (the reduced form of nicotinamide adenine dinucleotide phosphate). A large rate constant for association of ferredoxin to complex I indicates efficient recognition, with the protein subunit NdhS being the key component in this process.
External linksScience / PubMed:30573545
MethodsEM (single particle) / X-ray diffraction
Resolution1.9 - 3.34 Å
Structure data

0281

6hum

EMDB-0281, PDB-6hum:
Structure of the photosynthetic complex I from Thermosynechococcus elongatus
Method: EM (single particle) / Resolution: 3.34 Å

PDB-6a7k:
X-ray structure of NdhS from T. elongatus
Method: X-RAY DIFFRACTION / Resolution: 1.9 Å

Chemicals

ChemComp-ACY:
ACETIC ACID

ChemComp-HOH:
WATER

ChemComp-BCR:
BETA-CAROTENE

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

ChemComp-SF4:
IRON/SULFUR CLUSTER

Source
  • thermosynechococcus elongatus (strain bp-1) (bacteria)
  • thermosynechococcus elongatus bp-1 (bacteria)
KeywordsELECTRON TRANSPORT / NADH dehydrogenase-like complex / NDH-1 / cyclic electron flow (CEF) / Ferredoxin / PROTON TRANSPORT / Respiratory Complex / Cyclic electron flow / Complex I / Membrane protein complex

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