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Iron-Containing Ureases.

Denis A Proshlyakov1,2, Mark A Farrugia3, Yegor D Proshlyakov2

  • 1Department of Physiology, Michigan State University, Michigan State University, East Lansing, Michigan 48824, United States.

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|March 7, 2022
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Summary
This summary is machine-generated.

Oxygen-labile ureases utilize dual ferrous ions in their active sites, differing from conventional nickel-dependent ureases. These iron-based enzymes do not require accessory proteins for maturation, simplifying their biosynthesis.

Keywords:
Dinuclear ironResonance Raman spectroscopyUrease

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Area of Science:

  • Biochemistry
  • Enzymology
  • Structural Biology

Background:

  • Conventional ureases feature dinuclear nickel active sites, are oxygen-stable, and require accessory proteins for maturation.
  • Oxygen-labile ureases present an alternative catalytic mechanism with dual ferrous ions and no need for maturation proteins.

Purpose of the Study:

  • To elucidate the structural and electronic properties of oxygen-labile ureases.
  • To compare the active site architecture of oxygen-labile and conventional ureases.

Main Methods:

  • X-ray crystallography for structural determination.
  • Electronic spectroscopy to analyze the diferric form.
  • Resonance Raman spectroscopy to identify active site ligands.

Main Results:

  • The active site architecture of oxygen-labile ureases is similar to conventional ureases, featuring specific imidazole, carboxylate, and carbamylated lysine ligands.
  • The electronic spectrum of the diferric form is comparable to methemerythrin.
  • Resonance Raman spectroscopy confirmed a μ-oxo ligand and suggested terminal solvent ligands.

Conclusions:

  • Oxygen-labile ureases represent a distinct class of ureolytic enzymes with a simplified maturation pathway.
  • The conserved active site structure suggests convergent evolution of urease function despite differing metal cofactors.