8UEM image
Deposition Date 2023-10-02
Release Date 2024-10-16
Last Version Date 2025-07-09
Entry Detail
PDB ID:
8UEM
Keywords:
Title:
The CryoEM structure of the high affinity Carbon monoxide dehydrogenase from Mycobacterium smegmatis
Biological Source:
Source Organism:
Method Details:
Experimental Method:
Resolution:
1.85 Å
Aggregation State:
PARTICLE
Reconstruction Method:
SINGLE PARTICLE
Macromolecular Entities
Polymer Type:polypeptide(L)
Molecule:Carbon monoxide dehydrogenase (Large chain), CoxL
Chain IDs:A, D
Chain Length:799
Number of Molecules:2
Biological Source:Mycolicibacterium smegmatis MC2 155
Polymer Type:polypeptide(L)
Molecule:Carbon monoxide dehydrogenase medium chain
Chain IDs:B, E
Chain Length:296
Number of Molecules:2
Biological Source:Mycolicibacterium smegmatis MC2 155
Polymer Type:polypeptide(L)
Molecule:[2Fe-2S] binding domain protein
Chain IDs:C, F
Chain Length:158
Number of Molecules:2
Biological Source:Mycolicibacterium smegmatis MC2 155
Primary Citation
Quinone extraction drives atmospheric carbon monoxide oxidation in bacteria.
Nat.Chem.Biol. 21 1058 1068 (2025)
PMID: 39881213 DOI: 10.1038/s41589-025-01836-0

Abstact

Diverse bacteria and archaea use atmospheric CO as an energy source for long-term survival. Bacteria use [MoCu]-CO dehydrogenases (Mo-CODH) to convert atmospheric CO to carbon dioxide, transferring the obtained electrons to the aerobic respiratory chain. However, it is unknown how these enzymes oxidize CO at low concentrations and interact with the respiratory chain. Here, we use cryo-electron microscopy and structural modeling to show how Mo-CODHMs (CoxSML) from Mycobacterium smegmatis interacts with its partner, the membrane-bound menaquinone-binding protein CoxG. We provide electrochemical, biochemical and genetic evidence that Mo-CODH transfers CO-derived electrons to the aerobic respiratory chain through CoxG. Lastly, we show that Mo-CODH and CoxG genetically and structurally associate in diverse bacteria and archaea. These findings reveal the basis of the biogeochemically and ecologically important process of atmospheric CO oxidation, while demonstrating that long-range quinone transport is a general mechanism of energy conservation, which convergently evolved on multiple occasions.

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