||This prokaryotic enzyme catalyses the reversible reduction of CO2 to CO. The electrons are transferred to redox proteins such as ferredoxin. In purple sulfur bacteria and methanogenic archaea it catalyses the oxidation of CO to CO2, which is incorporated by the Calvin-Benson-Basham cycle or released, respectively. In acetogenic and sulfate-reducing microbes it catalyses the reduction of CO2 to CO, which is incorporated into acetyl CoA by EC 184.108.40.206, CO-methylating acetyl CoA synthase, with which the enzyme forms a tight complex in those organisms. The enzyme contains five metal clusters per homodimeric enzyme: two nickel-iron-sulfur clusters called the C-Clusters, one [4Fe-4S] D-cluster; and two [4Fe-4S] B-clusters. In methanogenic archaea additional [4Fe-4S] clusters exist, presumably as part of the electron transfer chain. In purple sulfur bacteria the enzyme forms complexes with the Ni-Fe-S protein EC 220.127.116.11, ferredoxin hydrogenase, which catalyse the overall reaction: CO + H2O = CO2 + H2. cf. EC 18.104.22.168, aerobic carbon monoxide dehydrogenase.
||Ragsdale, S.W., Clark, J.E., Ljungdahl, L.G., Lundie, L.L. and Drake, H.L. Properties of purified carbon monoxide dehydrogenase from Clostridium thermoaceticum, a nickel, iron-sulfur protein. J. Biol. Chem. 258 (1983) 2364–2369. [PMID: 6687389]
||Diekert, G. and Ritter, M. Purification of the nickel protein carbon monoxide dehydrogenase of Clostridium thermoaceticum. FEBS Lett. 151 (1983) 41–44. [DOI] [PMID: 6687458]
||Bonam, D. and Ludden, P.W. Purification and characterization of carbon monoxide dehydrogenase, a nickel, zinc, iron-sulfur protein, from Rhodospirillum rubrum. J. Biol. Chem. 262 (1987) 2980–2987. [PMID: 3029096]
||Drennan, C.L., Heo, J., Sintchak, M.D., Schreiter, E. and Ludden, P.W. Life on carbon monoxide: X-ray structure of Rhodospirillum rubrum Ni-Fe-S carbon monoxide dehydrogenase. Proc. Natl. Acad. Sci. USA 98 (2001) 11973–11978. [DOI] [PMID: 11593006]
||Dobbek, H., Svetlitchnyi, V., Gremer, L., Huber, R. and Meyer, O. Crystal structure of a carbon monoxide dehydrogenase reveals a [Ni-4Fe-5S] cluster. Science 293 (2001) 1281–1285. [DOI] [PMID: 11509720]
||Doukov, T.I., Iverson, T., Seravalli, J., Ragsdale, S.W. and Drennan, C.L. A Ni-Fe-Cu center in a bifunctional carbon monoxide dehydrogenase/acetyl-CoA synthase. Science 298 (2002) 567–572. [DOI] [PMID: 12386327]
||Can, M., Armstrong, F.A. and Ragsdale, S.W. Structure, function, and mechanism of the nickel metalloenzymes, CO dehydrogenase, and acetyl-CoA synthase. Chem. Rev. 114 (2014) 4149–4174. [DOI] [PMID: 24521136]