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NiFe H 2 ases catalyze the oxidation and formation of H 2 . Recent crystallographic data on the D. gigas enzyme reveals a 5-coordinate Ni site, bridged through sulfur ligands to an unusual Fe species with CO and CN - ligands. A key issue for H 2 ase is the oxidation states involved in different forms of the enzyme. Redox schemes involving Ni(III) -> Ni(II) ->...
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