Kinetics and Spectroscopic Evidence That the Cu(I)-Semiquinone Intermediate Reduces Molecular Oxygen in the Oxidative Half-Reaction of Arthrobacter globiformis Amine Oxidase

The role of copper during the reoxidation of substrate-reduced amine oxidases by O-2 has not yet been definitively established. Both outer-sphere and inner-sphere pathways for the reduction of O-2 to H2O2 have been proposed. A key step in the inner-sphere mechanism is the reaction of O-2 directly with the Cu(I) center of a Cu(I)-semiquinone intermediate. To thoroughly examine this possibility, we have measured the spectral changes associated with single-turnover reoxidation by O-2 of substrate-reduced Arthrobacter globiformis amine oxidase (AGAO) under a wide range of conditions. We have previously demonstrated that the internal electron-transfer reaction [Cu(II)-TPQ(AMQ) -> Cu(I) -TPQ(SQ)] (where TPQ(AMQ) is the aminoquinol form of reduced TPQ and TPQ(SQ) Is the semiquinone form) occurs at a rate that could permit the reaction Of O-2 with both species to be observed on the stopped-flow time scale [Shepard, E. M., and Dooley, D. M. (2006) J. Biol. Inorg. Chem. 11, 1039-1048]. The transient absorption spectra observed for the reaction of O-2 with substrate-reduced AGAO provide compelling support for the reaction of the Cu(I)-TPQ(SQ) form. Further, global analysis of the kinetics and the transient absorption spectra are fully consistent with an inner-sphere reaction of the Cu(I)-semiquinone intermediate with O-2 and are nconsistent with an outer-sphere mechanism for the reaction of the reduced enzyme with O-2.