Carbon-monoxide dehydrogenase (cytochrome b-561)

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carbon-monoxide oxygenase
EC number1.2.2.4
CAS number64972-88-9
IntEnzIntEnz view
ExPASyNiceZyme view
MetaCycmetabolic pathway
PDB structuresRCSB PDB PDBe PDBsum
Gene OntologyAmiGO / QuickGO

In enzymology, a carbon-monoxide dehydrogenase (cytochrome b-561) (EC is an enzyme that catalyzes the chemical reaction

CO + H2O + 2 ferricytochrome b-561 CO2 + 2 H+ + 2 ferrocytochrome b-561

The 3 substrates of this enzyme are CO, H2O, and ferricytochrome b-561, whereas its 3 products are CO2, H+, and ferrocytochrome b-561.

This enzyme belongs to the family of oxidoreductases, specifically those acting on the aldehyde or oxo group of donor with a cytochrome as acceptor. The systematic name of this enzyme class is carbon monoxide,water:cytochrome b-561 oxidoreductase. Other names in common use include carbon monoxide oxidase, carbon monoxide oxygenase (cytochrome b-561), carbon monoxide:methylene blue oxidoreductase, CO dehydrogenase, and carbon-monoxide dehydrogenase.


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  • Dobbek H, Gremer L, Meyer O, Huber R (1999). "Crystal structure and mechanism of CO dehydrogenase, a molybdo iron-sulfur flavoprotein containing S-selanylcysteine". Proc. Natl. Acad. Sci. U.S.A. 96: 8884–9. doi:10.1073/pnas.96.16.8884. PMC 17702. PMID 10430865.
  • Hanzelmann P, Dobbek H, Gremer L, Huber R, Meyer O (2000). "The effect of intracellular molybdenum in Hydrogenophaga pseudoflava on the crystallographic structure of the seleno-molybdo-iron-sulfur flavoenzyme carbon monoxide dehydrogenase". J. Mol. Biol. 301: 1221–35. doi:10.1006/jmbi.2000.4023. PMID 10966817.