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Mansuy, D. et al.

Formation of complexes between microsomal cytochrome P-450-Fe(II) and nitrosoarenes obtained by oxidation of arylhydroxylamines or reduction of nitroarenes in situ.

A cytochrome P-450 complex exhibiting a Soret peak at 454 nm is formed by direct interaction of nitrosobenzene with NADPH-reduced rat liver microsomes in anaerobic conditions, by reaction of phenylhydroxylamine with aerobic microsomes or during nitrobenzene reduction by NADPH-reduced or dithionite-reduced microsomes. In the latter conditions, the complex formation is only transient as it is unstable to dithionite. Analogous reactions with myoglobin lead to the previously described myoglobin-Fe(II)-nitrosobenzene complex which has similar properties to those of the 454-nm-absorbing cytochrome P-450 complex. This analogy, together with the various conditions of its formation, strongly indicates that it is a cytochrome-P-450-Fe(II)-nitrosobenzene complex. The corresponding complex with the 4-chloro-nitrosobenzene ligand is formed in similar conditions. Cytochrome P-450-Fe(II) complexes with nitrosoarenes seem less stable than the previously described complexes with nitrosoalkanes.[1]

References

Formation of complexes between microsomal cytochrome P-450-Fe(II) and nitrosoarenes obtained by oxidation of arylhydroxylamines or reduction of nitroarenes in situ. Mansuy, D., Beaune, P., Cresteil, T., Bacot, C., Chottard, J.C., Gans, P. Eur. J. Biochem. (1978) [Pubmed]

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