Journal
CHEMISTRY-A EUROPEAN JOURNAL
Volume 14, Issue 28, Pages 8674-8681Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/chem.200800906
Keywords
catalysis; density functional calculations; enzymes; oxidation; selenocysteine
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Funding
- University of Calabria and Regione Calabria [POR 2000/2006]
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Formate dehydrogenase is a molybdoenzyme of the anaerobic formate hydrogen lyase complex of the Escherichia coli microrganism that catalyzes the oxidation of formate to carbon dioxide. The two proposed mechanisms of reaction, which differ in the occurrence of a direct coordination or not of a SeCys residue to the molybdenum metal during catalysis were analyzed at the density functional level both vacuum and protein environments. Some DF functionals, in addition to the very popular B3LYP one, were employed to compute barrier heights. Results revealed the role played by the SeCys residue in per-forming the abstraction of the proton from the formate substrate. The computation of the energetic profiles for both mechanisms indicated that the reaction barriers are higher when the selenium is directly coordinated to the metal, whereas less energy is required when SeCys is not a ligand at the molybdenum site,
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