X Ray Absorption Spectroscopic Studies Of The Dinuclear Iron Center In Methane Monooxygenase And The Sulfure And Chlorine Centers In Photographic Materials
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X-ray Absorption Spectroscopic Studies of the Dinuclear Iron Center in Methane Monooxygenase and the Sulfure and Chlorine Centers in Photographic Materials
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Total Pages | : 284 |
Release | : 1992 |
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The dinuclear iron center of the hydroxylase component of soluble methane monooxygenase (MMO) from Methylococcus capsulatus and Methylosinus trichosporiwn has been studied by X-ray absorption spectroscopy. Analysis of the Fe K-edge EXAFS revealed that the first shell coordination of the Fe(HI)Fe(IH) oxidized state of the hydroxylase from M. capsulatus consists of approximately 6 N and 0 atoms at an average distance of 2.04 [Angstrom]. The Fe-Fe distance was determined to be 3.4 [Angstrom]. No evidence for the presence of a short oxo bridge in the iron center of the oxidized hydroxylase was found, suggesting that the active site of MMO is significantly different from the active sites of the dinuclear iron proteins hemery and ribonucleotide reductase. In addition, the results of the first shell fits suggest that there are more oxygen than nitrogen donor ligands.
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