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TitleRedox-coupled proton pumping drives carbon concentration in the photosynthetic complex I.
Journal, issue, pagesNat Commun, Vol. 11, Issue 1, Page 494, Year 2020
Publish dateJan 24, 2020
AuthorsJan M Schuller / Patricia Saura / Jacqueline Thiemann / Sandra K Schuller / Ana P Gamiz-Hernandez / Genji Kurisu / Marc M Nowaczyk / Ville R I Kaila /
PubMed AbstractPhotosynthetic organisms capture light energy to drive their energy metabolism, and employ the chemical reducing power to convert carbon dioxide (CO) into organic molecules. Photorespiration, ...Photosynthetic organisms capture light energy to drive their energy metabolism, and employ the chemical reducing power to convert carbon dioxide (CO) into organic molecules. Photorespiration, however, significantly reduces the photosynthetic yields. To survive under low CO concentrations, cyanobacteria evolved unique carbon-concentration mechanisms that enhance the efficiency of photosynthetic CO fixation, for which the molecular principles have remained unknown. We show here how modular adaptations enabled the cyanobacterial photosynthetic complex I to concentrate CO using a redox-driven proton-pumping machinery. Our cryo-electron microscopy structure at 3.2 Å resolution shows a catalytic carbonic anhydrase module that harbours a Zn active site, with connectivity to proton-pumping subunits that are activated by electron transfer from photosystem I. Our findings illustrate molecular principles in the photosynthetic complex I machinery that enabled cyanobacteria to survive in drastically changing CO conditions.
External linksNat Commun / PubMed:31980611 / PubMed Central
MethodsEM (single particle)
Resolution3.2 Å
Structure data

10513

6tjv

EMDB-10513, PDB-6tjv:
Structure of the NDH-1MS complex from Thermosynechococcus elongatus
Method: EM (single particle) / Resolution: 3.2 Å

Chemicals

ChemComp-DGD:
DIGALACTOSYL DIACYL GLYCEROL (DGDG)

ChemComp-PGT:
(1S)-2-{[{[(2R)-2,3-DIHYDROXYPROPYL]OXY}(HYDROXY)PHOSPHORYL]OXY}-1-[(PALMITOYLOXY)METHYL]ETHYL STEARATE / phospholipid*YM / Phosphatidylglycerol

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

ChemComp-BCR:
BETA-CAROTENE / Β-Carotene

ChemComp-CLA:
CHLOROPHYLL A / Chlorophyll a

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

ChemComp-ZN:
Unknown entry

ChemComp-HOH:
WATER / Water

Source
  • Thermosynechococcus elongatus BP-1 (bacteria)
  • thermosynechococcus elongatus (strain bp-1) (bacteria)
KeywordsMEMBRANE PROTEIN / carbon concentrating photosynthetic complex I / proton pump

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