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Characterization of two Arabidopsis thaliana glutathione S-transferases

  • Biotic and Abiotic Stress
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Abstract

Glutathione S-transferases (GST) are multifunctional proteins encoded by a large gene family, divided on the basis of sequence identity into phi, tau, theta, zeta and lambda classes. The phi and tau classes are present only in plants. GSTs appear to be ubiquitous in plants and are involved in herbicide detoxification and stress response, but little is known about the precise role of GSTs in normal plant physiology and during biotic and abiotic stress response. Two cDNAs representing the two plant classes tau and phi, AtGSTF9 and AtGSTU26, were expressed in vitro and the corresponding proteins were analysed. Both GSTs were able to catalyse a glutathione conjugation to 1-chloro-2,4-dinitrobenzene (CDNB), but they were inactive as transferases towards p-nitrobenzylchloride (pNBC). AtGSTF9 showed activity towards benzyl isothiocyanate (BITC) and an activity as glutathione peroxidase with cumene hydroperoxide (CumHPO). AtGSTU26 was not active as glutathione peroxidase and towards BITC. RT-PCR analysis was used to evaluate the expression of the two genes in response to treatment with herbicides and safeners, chemicals, low and high temperature. Our results reveal that AtGSTU26 is induced by the chloroacetanilide herbicides alachlor and metolachlor and the safener benoxacor, and after exposure to low temperatures. In contrast, AtGSTF9 seems not to be influenced by the treatments employed.

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Abbreviations

AGI:

Arabidopsis Genome Initiative

BITC:

Benzyl isothiocyanate

CDNB:

1-Chloro-2,4-dinitrobenzene

CumHPO:

Cumene hydroperoxide

DTT:

Dithiothreitol

GSH:

Glutathione

GST:

Glutathione S-transferase

MJ:

Methyl jasmonic acid

PCIB:

2-(p-Chlorophenoxy)-2-methylpropionic acid

pNBC:

p-Nitrobenzylchloride

RT-PCR:

Reverse transcript polymerase chain reaction

RTS:

Rapid Translation System

SA:

Salicylic acid

SAR:

Systemic acquired resistance

SDS-PAGE:

Sodium dodecyl sulphate polyacrylamide gel electrophoresis

2,4,6-T:

2,4,6-Trichlorophenol

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Correspondence to Luigi De Bellis.

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Communicated by P. Puigdoménech

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Nutricati, E., Miceli, A., Blando, F. et al. Characterization of two Arabidopsis thaliana glutathione S-transferases. Plant Cell Rep 25, 997–1005 (2006). https://doi.org/10.1007/s00299-006-0146-1

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  • DOI: https://doi.org/10.1007/s00299-006-0146-1

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