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Related Experiment Videos

Atomic resolution crystallography reveals how changes in pH shape the protein microenvironment.

Artem Y Lyubimov1, Paula I Lario, Ibrahim Moustafa

  • 1Department of Molecular, Cell and Developmental Biology, 1156 High Street, University of California, Santa Cruz, California 95064, USA.

Nature Chemical Biology
|April 11, 2006
PubMed
Summary

Atomic resolution crystallography reveals how pH affects cholesterol oxidase activity. A unique hydrogen bond at high pH explains cofactor stabilization and pH-dependent activity loss in this flavoenzyme oxidoreductase.

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Area of Science:

  • Biochemistry
  • Structural Biology
  • Enzymology

Background:

  • Hydrogen atoms are crucial for enzyme structure and catalytic function.
  • Atomic resolution crystallography (≥1.2 Å) is a key technique for studying hydrogen atom roles in enzymatic catalysis.

Purpose of the Study:

  • To investigate the impact of pH on cholesterol oxidase from Streptomyces sp., a flavoenzyme oxidoreductase, using atomic resolution crystallography.
  • To elucidate the mechanism behind the pH-dependent loss of enzyme activity.

Main Methods:

  • Atomic resolution crystallography was employed to study cholesterol oxidase at different pH levels.
  • UV-visible absorption spectroscopy was used to analyze the flavin cofactor's properties.

Main Results:

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  • Crystallographic data at basic pH showed an anionic oxidized flavin cofactor, correlating with observed UV-visible absorption profiles.
  • A reversible, pH-dependent loss of oxidation activity was explained by these observations.
  • An unusually short hydrogen bond was identified between a hydrogen atom and the Met122 carbonyl oxygen at high pH, suggesting a novel cofactor stabilization mechanism.

Conclusions:

  • The study demonstrates how environmental changes, specifically pH, influence the redox-active site of cholesterol oxidase.
  • These environmental factors significantly affect the enzyme's catalytic mechanism.
  • A new mechanism for flavin cofactor stabilization in cholesterol oxidase has been proposed.