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17O ESEEM Evidence for Exchange of the Axial Oxo Ligand in the Molybdenum Center of the High pH Form of Sulfite Oxidase

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journal contribution
posted on 2005-01-19, 00:00 authored by Andrei V. Astashkin, Feng, Arnold M. Raitsimring, John H. Enemark
A 17O ESEEM investigation of the high pH form of chicken sulfite oxidase using hyperfine sublevel correlation (HYSCORE) spectroscopy at 29.25 GHz has revealed a new type of exchangeable 17O ligand that is characterized by a significantly smaller hyperfine interaction (∼5 MHz) than that previously detected by CW EPR. This new type of exchangeable oxygen ligand is assigned to the axial oxo group of the Mo(V) center.