Glutathione conjugation plant transferase

Plants. Metabolism involves dechlorination and conjugation to glutathione-5-transferases, followed by further degradation to polar, water soluble, nonvolatile metabolites... 

Glutathione S-transferase enzymes have been detected In a variety of different plant species (24,76.64.97.101.107-110). Howevei, detailed enzyme studies have been limited to corn (24.76, J09., 12 ) and pea (. JOT., 110). The foliar tissue of corn contains a GST Isozyme that appears rather unique In Its ability to catalyze the conjugation of various 2-chloro-s-trlazlnes with GSH (78). The molecular weight and other properties of this Isozyme are similar to those reported for many mammalian GST Isozymes however, the pH optimum of this Isozyme for atrazine Is somewhat lower than that reported for many GST Isozymes (, 78,J09.). When corn Is treated with R-25788, a second Isozyme Is Induced ( ). The Induced Isozyme Is very effective In catalyzing the GSH conjugation of an a-chloroacetamlde herbicide (alachlor), but It was not assayed with atrazine ( ). 

Dean IV, Devarenne TP (1997) Peroxidase-mediated conjugation of glutathione to unsaturated phe-nylpropanoids. Evidence against glutathione S-transferase involvement. Physiol Plant 99 271-278... 

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