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Lipoxygenases: structural principles and spectroscopy

B J Gaffney1

  • 1Chemistry Department, Johns Hopkins University, Baltimore, Maryland 21218-2685, USA.

Annual Review of Biophysics and Biomolecular Structure
|January 1, 1996
PubMed
Summary
This summary is machine-generated.

Lipoxygenases are enzymes crucial for cell function, producing fatty acid hydroperoxides. Structural and spectroscopic studies reveal key iron-binding sites and a novel helix in soybean lipoxygenase-1, aiding mechanism elucidation.

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Area of Science:

  • Biochemistry
  • Structural Biology
  • Enzymology

Background:

  • Lipoxygenases (LOs) are key enzymes in producing fatty acid hydroperoxides.
  • These products play vital roles in normal and pathological cellular processes.
  • Understanding LO mechanisms is crucial for various biological and medical applications.

Purpose of the Study:

  • To elucidate the catalytic mechanism of lipoxygenases.
  • To identify the structural features and ligands of the active iron atom in soybean lipoxygenase-1.
  • To compare lipoxygenases from different sources using various spectroscopic techniques.

Main Methods:

  • X-ray structure analysis of soybean lipoxygenase-1.
  • Spectroscopic studies including electron magnetic resonance (EMR) and X-ray absorption spectroscopy (XAS).
  • Infrared circular dichroism (IRCD) and magnetic circular dichroism (MCD) for comparative analysis.

Main Results:

  • Two X-ray structures revealed three histidine side chains and the carboxy terminus as iron ligands in soybean lipoxygenase-1.
  • A novel three-turn pi-helix was identified near the enzyme's iron center.
  • Spectroscopic data allowed for comparisons between lipoxygenases from different sources and with varying substrate specificities.

Conclusions:

  • The structural and spectroscopic data provide detailed insights into the lipoxygenase active site and mechanism.
  • The identified iron-ligand interactions and the novel pi-helix are important for enzyme function.
  • Comparative spectroscopic analyses contribute to understanding the diversity and specificity of lipoxygenases.