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Plant glutathione transferases.

David P Dixon1, Adrian Lapthorn, Robert Edwards

  • 1School of Biological and Biomedical Sciences, University of Durham, Durham DH1 3LE, UK. Robert.Edwards@durham.ac.uk

Genome Biology
|March 19, 2002
PubMed
Summary

Plant glutathione transferases (GSTs) are a diverse gene family with crucial roles in detoxification and stress response. Despite sequence evolution for multiple functions, their protein structure remains highly conserved.

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Area of Science:

  • Plant molecular biology
  • Biochemistry
  • Genetics

Background:

  • Soluble glutathione transferases (GSTs) form a large, diverse gene family in plants.
  • GSTs are classified into phi, tau, theta, zeta, and lambda classes, with theta and zeta having animal counterparts.

Purpose of the Study:

  • To explore plant-specific GST classes (phi, tau, lambda).
  • To investigate the functional diversification and conserved structure of GSTs in plants.

Main Methods:

  • Bioinformatic analysis of the Arabidopsis thaliana genome for GST gene identification.
  • Review of existing literature on GST functions and protein structure.

Main Results:

  • Arabidopsis thaliana possesses 48 GST genes, predominantly in the tau and phi classes.
  • GSTs catalyze crucial reactions like herbicide detoxification, oxidative stress reduction, and tyrosine catabolism.
  • GSTs also perform non-catalytic roles, including binding flavonoids and participating in cell signaling pathways.

Conclusions:

  • Plant GSTs have diversified through gene duplication to perform various catalytic and non-catalytic functions.
  • Despite functional diversification, the protein structure of GSTs has remained highly conserved.
  • GSTs exemplify protein family evolution, balancing functional adaptation with structural conservation.

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