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Plant Molecular Biology

, Volume 52, Issue 3, pp 591–603 | Cite as

Cloning, characterization and regulation of a family of phi class glutathione transferases from wheat

  • Ian Cummins
  • David O'Hagan
  • Istvan Jablonkai
  • David J. Cole
  • Alain Hehn
  • Danièle Werck-Reichhart
  • Robert EdwardsEmail author
Article

Abstract

Six phi (F) class glutathione transferases (GSTs) were cloned from bread wheat (Triticum aestivum L.) treated with the herbicide safener fenchlorazole ethyl and named TaGSTF1–6. Recombinant TaGSTFs were assayed for glutathione conjugating activity towards xenobiotics including herbicides and for glutathione peroxidase (GPOX) activity. TaGSTF1, which resembled ZmGSTF1, the dominant GST in maize (Zea mays), was highly active in conjugating 1-chloro-2,4-dinitrobenezene (CDNB) but had low activities towards chloroacetanilide, diphenyl ether and aryloxphenoxypropionate herbicides. TaGSTF2, TaGSTF3 and TaGSTF4 all resembled the safener-inducible ZmGSTF2, with TaGSTF2 and TaGSTF3 being highly active GPOXs and rapidly detoxifying chloroacetanilides. TaGSTF5 resembled ZmGSTF3, having limited conjugating and GPOX activity. TaGSTF6 contained both ZmGSTF1- and ZmGSTF2-like sequences but was most similar to ZmGSTF1 in detoxifying activity. The expression of TaGSTFs in wheat seedlings was enhanced upon exposure to fenchlorazole ethyl, herbicides or other chemical inducing treatments. TaGSTFs were also enhanced by treatment with the natural products caffeic acid, 7,4-dihydroxyflavone and naringenin. The CDNB-conjugating activity of TaGSTF1, and to a lesser extent TaGSTF6, was highly sensitive to inhibition by flavonoids, particularly the chalcone isoliquiritigenin. The other TaGSTFs were much less sensitive to such inhibition. It was subsequently determined that isoliquiritigenin underwent glutathione conjugation, though this reversible reaction did not require the intervention of any TaGSTF. The potential importance of GSTFs and glutathione conjugation in flavonoid metabolism is discussed.

chalcones flavonoids glutathione transferases herbicides ligandin S-isoliquirtigenin-glutathione Triticum aestivum xenobiotics Zea mays 

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Copyright information

© Kluwer Academic Publishers 2003

Authors and Affiliations

  • Ian Cummins
    • 1
  • David O'Hagan
    • 2
  • Istvan Jablonkai
    • 3
  • David J. Cole
    • 4
  • Alain Hehn
    • 5
  • Danièle Werck-Reichhart
    • 5
  • Robert Edwards
    • 1
    Email author
  1. 1.Crop Protection Group, School of Biological and Biomedical SciencesUniversity of DurhamDurhamUK
  2. 2.Department of ChemistryUniversity of St. AndrewsSt. Andrews, FifeUK
  3. 3.Chemical Research Centre, Hungarian Academy of SciencesBudapestHungary
  4. 4.Formerly of Aventis Crop ScienceOngar, EssexUK
  5. 5.CNRS-IBMP UPR2357, Department Plant Stress ResponseUniversité Louis PasteurStrasbourgFrance

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