title: A mixed valence form of the iron cluster in the B2 protein of ribonucleotide reductase from Escherichia coli.
abstract: A mixed valent form of the iron cluster (Fe(II)Fe(III) in the B2 protein of ribonucleotide reductase has been isolated and characterized. The irons in this state of the protein are ferromagnetically coupled as indicated by the observation of a novel S = 9/2 EPR spectrum. This is the first ferromagnetically coupled Fe(II)Fe(III) cluster reported for a protein and the first observation of the mixed valence form of ribonucleotide reductase.
authors.affiliation: Department of Chemistry, University of Minnesota, Minneapolis 55455.
authors.forename: M P
authors.initials: MP
authors.lastname: Hendrich
authors.forename: T E
authors.initials: TE
authors.lastname: Elgren
authors.forename: L
authors.initials: L
authors.lastname: Que
mesh_terms: D004578:Electron Spin Resonance Spectroscopy; D004926:Escherichia coli / Q000201:enzymology*; D005290:Ferric Compounds / Q000737:chemistry*; D005296:Ferrous Compounds / Q000737:chemistry*; D012264:Ribonucleotide Reductases / Q000737:chemistry*
chemical_list: D005290:Ferric Compounds; D005296:Ferrous Compounds; D012264:Ribonucleotide Reductases