title: 17O ESEEM evidence for exchange of the axial oxo ligand in the molybdenum center of the high pH form of sulfite oxidase.
abstract: 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 ( approximately 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.
authors.affiliation: Department of Chemistry, University of Arizona, Tucson, Arizona 85721-0041, USA.
authors.forename: Andrei V
authors.initials: AV
authors.lastname: Astashkin
authors.forename: Changjian
authors.initials: C
authors.lastname: Feng
authors.forename: Arnold M
authors.initials: AM
authors.lastname: Raitsimring
authors.forename: John H
authors.initials: JH
authors.lastname: Enemark
mesh_terms: D004578:Electron Spin Resonance Spectroscopy / Q000379:methods; D006863:Hydrogen-Ion Concentration; D008024:Ligands; D008958:Models, Molecular; D008982:Molybdenum / Q000737:chemistry* / Q000378:metabolism; D050862:Oxidoreductases Acting on Sulfur Group Donors / Q000737:chemistry* / Q000378:metabolism; D010103:Oxygen Isotopes
chemical_list: D008024:Ligands; D010103:Oxygen Isotopes; D008982:Molybdenum; D050862:Oxidoreductases Acting on Sulfur Group Donors