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Purification, regulation and cloning of a glutathione transferase (GST) from maize resembling the auxin-inducible type-III GSTs

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Abstract

The glutathione transferases (GSTs) from maize (Zea mays L.) with activities toward the chloroacetanilide herbicide metolachlor and the diphenyl ether herbicide fluorodifen were fractionated into two pools based on binding to affinity columns. Pool 1 GSTs were retained on Orange A agarose and were identified as isoenzymes Zea mays (Zm) GST I-I, Zm GST I-II and Zm GST I-III, which have been described previously. Pool 2 GSTs selectively bound to S-hexyl-glutathione-Sepharose and were distinct from the pool 1 GSTs, being composed of a homodimer of 28.5 kDa subunits, termed Zm GST V-V, and a heterodimer of the 28.5 kDa polypeptide and a 27.5 kDa subunit, termed Zm GST V-VI. Using an antibody raised to Zm GST V-VI, a cDNA expression library was screened and a Zm GST V clone identified showing sequence similarity to the type-III auxin-inducible GSTs previously identified in tobacco and other dicotyledenous species. Recombinant Zm GST V-V showed high GST activity towards the diphenyl ether herbicide fluorodifen, detoxified toxic alkenal derivatives and reduced organic hydroperoxides. Antibodies raised to Zm GST I-II and Zm GST V-VI were used to monitor the expression of GST subunits in maize seedlings. Over a 24 h period the Zm GST I subunit was unresponsive to chemical treatment, while expression of Zm GST II was enhanced by auxins, herbicides, the herbicide safener dichlormid and glutathione. The Zm GST V subunit was more selective in its induction, only accumulating significantly in response to dichlormid treatment. During development Zm GST I and Zm GST V were expressed more in roots than in shoots, with Zm GST II expression limited to the roots.

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Authors and Affiliations

  1. Crop Protection Group, Department of Biological Sciences, University of Durham, Durham, DH1 3LE, UK

    David P. Dixon & Robert Edwards

  2. Rhône-Poulenc Agriculture Ltd., Fyfield Road, Ongar, Essex, CM5 OHW, UK

    David J. Cole

Authors
  1. David P. Dixon
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  2. David J. Cole
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  3. Robert Edwards
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Dixon, D.P., Cole, D.J. & Edwards, R. Purification, regulation and cloning of a glutathione transferase (GST) from maize resembling the auxin-inducible type-III GSTs. Plant Mol Biol 36, 75–87 (1998). https://doi.org/10.1023/A:1005958711207

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