title: ENDOR of metalloenzymes.
abstract: This Account examines the role of electron-nuclear double resonance (endor) spectroscopy in furthering our understanding of how metal ions function in biological systems. It briefly describes endor and electron spin-echo envelope modulation (eseem) spectroscopies and then illustrates the uses of endor with several case studies from our own research: cytochrome c peroxidase compound ES; ribonucleotide reductase intermediate X; allylbenzene-inactivated chloroperoxidase; the role of the [4Fe-4S](+) cluster in enzymes of the "radical S-adenosylmethionine" superfamily; dioxygen activation by heme enzymes. Finally, it briefly considers future developments.
authors.affiliation: Department of Chemistry, Northwestern University, 2145 Sheridan Road, Evanston, Illinois 60208-3113, USA. bmh@northwestern.edu
authors.forename: Brian M
authors.initials: BM
authors.lastname: Hoffman
mesh_terms: D004578:Electron Spin Resonance Spectroscopy / Q000379:methods*; D004798:Enzymes / Q000737:chemistry* / Q000378:metabolism; D008667:Metalloproteins / Q000737:chemistry* / Q000378:metabolism; D015394:Molecular Structure
chemical_list: D004798:Enzymes; D008667:Metalloproteins