Article
Electron injection through a specific pathway determines the outcome of oxygen activation at the diiron cluster in the F208Y mutant of Escherichia coli ribonucleotide reductase protein R2.
Biochemistry - 27 Jan 1998
Parkin S E, Chen S, Ley B A, Mangravite L, Edmondson D E, Huynh B H, Bollinger J M
Abstract excerpt
Protein R2 of ribonucleotide reductase from Escherichia coli contains a dinuclear iron cluster, which reductively activates O2 to produce the enzyme's functionally essential tyrosyl radical by one-electron oxidation of residue Y122. A key step in this reaction is the rapid injection of a single electron from an exogenous reductant (Fe2+ or ascorbate) during formation of the radical-generating intermediate,...
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