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Nickel-containing carbon monoxide dehydrogenases, acetyl-CoA synthases, nickel–iron hydrogenases, and diron hydrogenases are distinct metalloenzymes yet they share a number of important characteristics. All are O 2 -sensitive, with active-sites composed of iron and/or nickel ions coordinated primarily by sulfur ligands. In each case, two metals are juxtaposed at the “heart” of the active site,...
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