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Formation of iron(II)-nitrosoalkane complexes: a new activity of microperoxidase 8

R Ricoux1, J L Boucher, D Mansuy

  • 1Laboratoire de Chimie et Biochimie Pharmacologiques et Toxicologiques, UMR 8601 CNRS, Université Paris V, 45 rue des Saints-Pères, 75270, Paris cedex 06, France.

Biochemical and Biophysical Research Communications
|November 10, 2000
PubMed

Insights

Microperoxidase 8 (MP8) demonstrates a new catalytic activity, forming iron(II)-metabolite complexes by oxidizing hydroxylamines or reducing nitroalkanes. These complexes serve as valuable models for cytochrome P450 interactions in toxicology and pharmacology.

Area of Science:

  • Biochemistry
  • Enzymology
  • Toxicology

Background:

  • Microperoxidase 8 (MP8) is a heme octapeptide derived from cytochrome c.
  • MP8 exhibits both peroxidase-like and cytochrome P450-like activities.
  • Heme iron's fifth ligand is typically histidine in MP8.

Purpose of the Study:

  • To investigate novel catalytic activities of MP8.
  • To characterize the formation and properties of MP8-iron(II)-metabolite complexes.
  • To establish MP8 as a model for hemoproteins in toxicology and pharmacology.

Main Methods:

  • Enzymatic hydrolysis of heart cytochrome c to obtain MP8.
  • Oxidation of aliphatic and aromatic hydroxylamines using MP8.
  • Reduction of nitroalkanes using MP8.
  • Spectroscopic analysis (UV-Vis) of resulting complexes.

Main Results:

  • MP8 oxidizes hydroxylamines to form MP8-Fe(II)-nitrosoalkane/arene complexes (λmax ≈ 414 nm).
  • These complexes can also be synthesized via reduction of nitroalkanes.
  • This represents the first fully characterized iron(II)-metabolite complexes of MP8.
  • The complexes serve as models for amphetamine or macrolide oxidation by cytochromes P450.

Conclusions:

  • MP8 exhibits a new catalytic activity involving iron(II)-metabolite complex formation.
  • MP8 is a valuable and convenient model for studying hemoproteins like cytochromes P450 and peroxidases.
  • This research advances understanding in toxicology and pharmacology by modeling drug metabolism.

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