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Heme ferrous-hydroperoxo complexes: some theoretical considerations.

Radu Silaghi-Dumitrescu1

  • 1Department of Chemistry and Center for Metalloenzyme Studies, University of Georgia, Athens, GA 30602, USA. silaghi@chem.uga.edu

Archives of Biochemistry and Biophysics
|March 30, 2004
PubMed
Summary

Density functional calculations reveal ferrous heme-hydroperoxide complexes exhibit similar structures and charge distributions to ferric counterparts. This supports ferrous hemoproteins

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Area of Science:

  • Computational chemistry
  • Biochemistry
  • Inorganic chemistry

Background:

  • Hemoproteins play crucial roles in biological catalysis.
  • Understanding heme redox states is vital for elucidating enzyme mechanisms.
  • Hydroperoxide interactions with heme are key in oxidative processes.

Purpose of the Study:

  • To investigate the electronic and geometric properties of ferrous heme-hydroperoxide complexes.
  • To compare ferrous complexes with previously studied ferric counterparts.
  • To provide theoretical support for experimental observations of ferrous hemoprotein activity.

Main Methods:

  • Density functional theory (DFT) calculations.
  • Analysis of geometrical parameters.
  • Charge distribution analysis.

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Main Results:

  • Ferrous heme-hydroperoxide complexes show identical Fe-O-O-H moiety geometry and charge distribution to ferric analogs.
  • The additional negative charge in ferrous complexes is localized on the porphyrin ring.
  • Diamagnetic ferrous complexes display similar reactivity to paramagnetic ferric complexes.

Conclusions:

  • The ferrous state of hemoproteins can catalytically cleave the peroxide O-O bond.
  • Reactivity is similar to ferric-peroxo complexes, challenging Fenton-based mechanisms.
  • Findings support experimental evidence for ferrous hemoprotein-peroxide interactions.