title: Characterization and stability of hydrogenase from Chromatium.
abstract: The absorption spectrum of the hydrogenase from Chromatium, which contains four iron atoms and four atoms of acid-labile sulfide, in 80% dimethylsulfoxide or hexamethylphosphoramide suggests the presence of a single [4Fe-4S] cluster. The EPR spectra of the oxidized enzyme in air, argon or carbon monoxide are the same with signals centered at g = 2.01. The enzyme reduced by hydrogen is EPR silent. The EPR spectrum is consistent with a [4Fe-4S] cluster. Chromatium hydrogenase and the hydrogenase from Proteus vulgaris show relative stability towards denaturation by sodium dodecyl sulfate (SDS), urea, guanidine and organic solvents.
mesh_terms: D002844:Chromatium / Q000201:enzymology*; D004578:Electron Spin Resonance Spectroscopy; D006864:Hydrogenase; D007506:Iron-Sulfur Proteins / Q000032:analysis*; D008667:Metalloproteins / Q000032:analysis*; D010088:Oxidoreductases / Q000378:metabolism*; D011489:Protein Denaturation / Q000187:drug effects
chemical_list: D007506:Iron-Sulfur Proteins; D008667:Metalloproteins; D010088:Oxidoreductases; D006864:Hydrogenase