Catalytic and Structural Diversity of the Fluazifop-inducible Glutathione Transferases from Phaseolus Vulgaris

Overview

Journal Planta

Specialty Biology

Date 2011 Dec 29

PMID 22203322

Citations 9

Authors

Evangelia Chronopoulou

Panagiotis Madesis

Basiliki Asimakopoulou

Dimitrios Platis

Athanasios Tsaftaris

Nikolaos E Labrou

Affiliations

Soon will be listed here.

Abstract

Plant glutathione transferases (GSTs) comprise a large family of inducible enzymes that play important roles in stress tolerance and herbicide detoxification. Treatment of Phaseolus vulgaris leaves with the aryloxyphenoxypropionic herbicide fluazifop-p-butyl resulted in induction of GST activities. Three inducible GST isoenzymes were identified and separated by affinity chromatography. Their full-length cDNAs with complete open reading frame were isolated using RACE-RT and information from N-terminal amino acid sequences. Analysis of the cDNA clones showed that the deduced amino acid sequences share high homology with GSTs that belong to phi and tau classes. The three isoenzymes were expressed in E. coli and their substrate specificity was determined towards 20 different substrates. The results showed that the fluazifop-inducible glutathione transferases from P. vulgaris (PvGSTs) catalyze a broad range of reactions and exhibit quite varied substrate specificity. Molecular modeling and structural analysis was used to identify key structural characteristics and to provide insights into the substrate specificity and the catalytic mechanism of these enzymes. These results provide new insights into catalytic and structural diversity of GSTs and the detoxifying mechanism used by P. vulgaris.

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