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Plant glutathione transferases.

Robert Edwards1, David P Dixon

  • 1Centre for Bioactive Chemistry, School of Biological and Biomedical Sciences, Durham University, United Kingdom.

Methods in Enzymology
|January 10, 2006
PubMed
Summary

Plant glutathione transferases (GSTs) are crucial enzymes with diverse roles. This study details the specific plant functions of different GST classes, including their roles in herbicide selectivity and oxidative stress response.

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Area of Science:

  • Biochemistry
  • Plant Science
  • Enzymology

Background:

  • Soluble plant glutathione transferases (GSTs) encompass seven classes, with six functionally characterized.
  • Phi and tau GSTs are plant-specific, abundant, and involved in xenobiotic conjugation, influencing herbicide selectivity.
  • Zeta and theta GSTs are conserved across species, with theta acting as glutathione peroxidases and zeta as isomerases.

Purpose of the Study:

  • To elucidate the diverse, plant-specific functions of the different glutathione transferase (GST) classes.
  • To characterize the enzymatic activities and biological roles of plant GSTs beyond xenobiotic conjugation.

Main Methods:

  • Comparative analysis of GST sequences and structures.
  • Enzymatic assays to determine substrate specificities and catalytic activities.
  • Functional characterization of plant-specific GST classes (DHARs and lambda GSTs).

Main Results:

  • Phi and tau GSTs exhibit broad xenobiotic conjugating activities, impacting herbicide selectivity in crops and weeds.
  • Theta GSTs function as glutathione peroxidases, mitigating oxidative stress by reducing organic hydroperoxides.
  • Zeta GSTs act as glutathione-dependent isomerases in tyrosine degradation.
  • DHARs and lambda GSTs, distinct monomers with catalytic cysteines, function as thioltransferases, with DHARs specifically reducing dehydroascorbate.

Conclusions:

  • Plant GSTs possess a wide array of specialized functions beyond simple xenobiotic detoxification.
  • Understanding these diverse roles is critical for plant physiology, stress response, and agricultural applications.
  • The distinct structural and catalytic properties of different GST classes underpin their varied biological roles.

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