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The three-dimensional structure of catalase from Enterococcus faecalis.

Kjell O Håkansson1, Myriam Brugna, Lena Tasse

  • 1August Krogh Institute, Copenhagen University, Universitetsparken 13, DK-2100 Kbh O, Denmark. kohakansson@aki.ku.dk

Acta Crystallographica. Section D, Biological Crystallography
|July 24, 2004
PubMed
Summary

Researchers crystallized Enterococcus faecalis haem catalase, revealing a homotetrameric structure similar to Proteus mirabilis catalase. The active site solvent structure is unique among catalases.

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Area of Science:

  • Biochemistry
  • Structural Biology
  • Crystallography

Background:

  • Catalases are essential enzymes that protect cells from oxidative damage by decomposing hydrogen peroxide.
  • Enterococcus faecalis is a common bacterium, and understanding its catalase structure can provide insights into its virulence and potential drug targets.

Purpose of the Study:

  • To determine the three-dimensional structure of Enterococcus faecalis haem catalase.
  • To compare the structure of E. faecalis catalase with other known catalases, particularly its closest relative, Proteus mirabilis.

Main Methods:

  • Crystallization of Enterococcus faecalis haem catalase using lithium sulfate at neutral pH.
  • X-ray diffraction data collection at 2.3 A resolution using synchrotron radiation.
  • Structure determination by molecular replacement and refinement.

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Main Results:

  • The E. faecalis catalase was crystallized in space group R3 with specific unit-cell parameters.
  • The three-dimensional structure revealed a homotetrameric quaternary structure.
  • The overall fold and structure are similar to Proteus mirabilis catalase, but the active site solvent structure is unique.

Conclusions:

  • The determined structure provides a high-resolution model of Enterococcus faecalis haem catalase.
  • Structural comparison highlights conserved features and unique adaptations in the active site.
  • Further studies can explore the functional implications of the unique solvent structure for enzyme activity and inhibition.