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Hoffmann, R. A wiki for the life sciences where authorship matters. Nature Genetics (2008)

Accleration of autooxidation of human oxyhemoglobin by aniline and its relation to hemoglobin-catalyzed aniline hydroxylation.

Changes in the ultraviolet/visible spectrum of human oxyferrohemoglobin upon addition of aniline were indicative of a concentration-dependent interaction of aniline with hemoglobin, resulting in accelerated autooxidation of the hemoprotein. Oxygen was found to markedly inhibit this interaction of aniline with oxyhemoglobin. The dependence of the rate of autooxidation on aniline concentration followed saturation kinetics and showed a half-maximal response at 8 mM aniline. This value is equal to the value of Km for aniline as substrate for the O2-dependent, hemoglobin-catalyzed hydroxylation reaction which yields p-aminophenol (Mieyal, J. J., Ackerman, R.S., Blumer, J.L., and Freeman, L.S. (1976) J. Biol. Chem. 241, 3436-3441). Thus, an aniline-oxyhemoglobin complex is implicated in the overall catalytic reaction. No detectable p-aminophenol was formed when aniline was combined with oxyhemoglobin in the absence of an electron donor, but hydroxylation of aniline does occur when NADPH, NADPH plus P-450 reductase, or Na2S2O4 are also added.[1]


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