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Related Experiment Videos

Human glutathione-dependent formaldehyde dehydrogenase. Structural changes associated with ternary complex formation.

Paresh C Sanghani1, William F Bosron, Thomas D Hurley

  • 1Center for Structural Biology, Department of Biochemistry and Molecular Biology, Indiana University School of Medicine, Indianapolis, Indiana 46202, USA.

Biochemistry
|December 18, 2002
PubMed
Summary

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Human glutathione-dependent formaldehyde dehydrogenase, crucial for metabolizing glutathione adducts, undergoes domain closure upon substrate binding. This structural change impacts its catalytic mechanism and zinc coordination during the reaction.

Area of Science:

  • Biochemistry
  • Structural Biology
  • Enzymology

Background:

  • Human glutathione-dependent formaldehyde dehydrogenase (GSH-FDH) is vital for detoxifying reactive aldehydes and metabolizing S-(hydroxymethyl)glutathione and S-nitrosoglutathione.
  • Understanding the enzyme's active site and catalytic mechanism is key to elucidating its physiological role.

Purpose of the Study:

  • To investigate the role of active site residues in substrate binding and the structural dynamics of GSH-FDH during its catalytic cycle.
  • To determine the crystal structure of a ternary complex to visualize enzyme-substrate-coenzyme interactions.

Main Methods:

  • X-ray crystallography was employed to determine the structure of the ternary complex of GSH-FDH with S-(hydroxymethyl)glutathione and NADH to 2.6 A resolution.
  • Analysis of the crystal structure focused on domain movements, active site residue interactions, and zinc coordination.

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Main Results:

  • The study observed domain closure in GSH-FDH upon ternary complex formation, with the catalytic domain moving towards the coenzyme-binding domain.
  • A novel proton relay mechanism involving a water molecule and the coenzyme was identified, differing from class I alcohol dehydrogenases.
  • S-(hydroxymethyl)glutathione directly coordinates to the active site zinc, altering its coordination environment compared to the binary coenzyme complex.

Conclusions:

  • The observed domain closure represents a significant conformational change in GSH-FDH in response to substrate binding.
  • The findings reveal a unique catalytic mechanism and zinc coordination strategy employed by GSH-FDH.
  • This structural insight provides a foundation for understanding the enzyme's function in glutathione metabolism and detoxification pathways.