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Related Experiment Videos

Non-heme Fe(IV)-oxo intermediates.

Carsten Krebs1, Danica Galonić Fujimori, Christopher T Walsh

  • 1Department of Biochemistry and Molecular Biology, The Pennsylvania State University, University Park, Pennsylvania 16802, USA. ckrebs@psu.edu

Accounts of Chemical Research
|June 5, 2007
PubMed
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High-valent iron-oxo intermediates are crucial in biological oxidations. Recent studies directly characterized these non-heme iron-oxo species in alpha-ketoglutarate-dependent enzymes, revealing conserved hydroxylation mechanisms and distinct pathways for halogenation.

Area of Science:

  • Biochemistry
  • Bioinorganic Chemistry
  • Enzymology

Background:

  • High-valent non-heme iron-oxo intermediates are long-proposed key players in biological oxidation.
  • Recent advances have enabled direct characterization of these intermediates.

Purpose of the Study:

  • To investigate the mechanistic roles of non-heme iron-oxo intermediates in alpha-ketoglutarate-dependent oxygenases.
  • To compare the reaction pathways of hydroxylation and halogenation catalyzed by these enzymes.

Main Methods:

  • Direct characterization of iron intermediates using spectroscopic methods.
  • Studies on alpha-ketoglutarate-dependent hydroxylases and the halogenase CytC3.

Main Results:

  • Fe(IV)-oxo intermediates were directly characterized in both hydroxylation and halogenation reactions.

Related Experiment Videos

  • A conserved mechanism involving Fe(IV)-oxo intermediates was observed for hydroxylases.
  • Two distinct Fe(IV) complexes in rapid equilibrium were identified for the halogenase CytC3, suggesting divergent reactivity.

    • Conclusions:

    • Non-heme Fe(IV)-oxo complexes are central to C-H bond cleavage in alpha-ketoglutarate-dependent oxygenases.
    • Distinct Fe(IV) site conformations may explain the divergence between hydroxylation and halogenation pathways.
    • These findings provide insights into the mechanisms of mononuclear non-heme iron enzymes.