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Oxygen activating nonheme iron enzymes

S J Lange1, L Que

  • 1Department of Chemistry Center for Metals in Biocatalysis, University of Minnesota, 207 Pleasant Street SE, Minneapolis, MN 55455, USA.

Current Opinion in Chemical Biology
|July 17, 1998
PubMed
Summary

Recent advances in oxygen-activating nonheme iron enzymes include new crystal structures and insights into catalytic mechanisms. Research highlights key structural motifs and high-valent intermediates, expanding our understanding of these vital biological catalysts.

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Area of Science:

  • Biochemistry
  • Enzymology
  • Structural Biology

Background:

  • Nonheme iron enzymes play crucial roles in biological oxygen activation.
  • Understanding their structure-function relationships is essential for various biochemical processes.

Purpose of the Study:

  • To summarize recent significant advances in the study of oxygen-activating nonheme iron enzymes.
  • To highlight new structural and mechanistic insights.

Main Methods:

  • X-ray crystallography of enzyme-substrate complexes.
  • Characterization of high-valent catalytic intermediates.
  • Biophysical and biochemical studies of enzyme activity.
  • Synthesis and characterization of model complexes.

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Main Results:

  • Thirteen crystal structures of protocatechuate 3,4-dioxygenase revealed active site dynamics.
  • A conserved 2-His-1-carboxylate facial triad motif was identified in mononuclear nonheme iron enzymes.
  • Metrical data for high-valent intermediates Q and X were obtained for methane monooxygenase and ribonucleotide reductase.
  • Nonheme diiron sites were identified in alkene monooxygenase and alkane hydroxylase (AlkB).
  • Synthetic complexes successfully mimicked enzymatic activities of various nonheme iron enzymes.

Conclusions:

  • Significant progress has been made in understanding the structure, mechanism, and diversity of nonheme iron enzymes.
  • Structural and mechanistic insights are advancing the fields of biochemistry and enzymology.
  • Mimicry studies provide further validation of proposed catalytic pathways.