Nickel clusters catalytic reactions involving

Two clusters in CO dehydrogenase are required for oxidation of CO or reduction of CO 2 (Figure 1). The catalytic site is a nickel iron sulfur cluster called Cluster C. The two electrons involved in this redox reaction are transferred to or from a ferredoxin-like [4Fe64S] cluster called Cluster B. Cluster C is a NiFeS center whereas. Cluster B is most certainly a typical [4Fe64S] cluster (Ragsdale et ah, 1982 Lindahl et al., 1990 Lindahl et ah, 1990). 

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