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Wang X, Dong J, Hu Y, Huang Q, Lu X, Huang Y, Sheng M, Cao L, Xu B, Li Y, Zong Y, Guo W. Identification and Characterization of the Glutathione S-Transferase Gene Family in Blueberry ( Vaccinium corymbosum) and Their Potential Roles in Anthocyanin Intracellular Transportation. PLANTS (BASEL, SWITZERLAND) 2024; 13:1316. [PMID: 38794388 PMCID: PMC11125127 DOI: 10.3390/plants13101316] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/07/2024] [Revised: 04/29/2024] [Accepted: 05/07/2024] [Indexed: 05/26/2024]
Abstract
The glutathione S-transferases (GSTs, EC 2.5.1.18) constitute a versatile enzyme family with pivotal roles in plant stress responses and detoxification processes. Recent discoveries attributed the additional function of facilitating anthocyanin intracellular transportation in plants to GSTs. Our study identified 178 VcGST genes from 12 distinct subfamilies in the blueberry genome. An uneven distribution was observed among these genes across blueberry's chromosomes. Members within the same subfamily displayed homogeneity in gene structure and conserved protein motifs, whereas marked divergence was noted among subfamilies. Functional annotations revealed that VcGSTs were significantly enriched in several gene ontology and KEGG pathway categories. Promoter regions of VcGST genes predominantly contain light-responsive, MYB-binding, and stress-responsive elements. The majority of VcGST genes are subject to purifying selection, with whole-genome duplication or segmental duplication serving as key processes that drive the expansion of the VcGST gene family. Notably, during the ripening of the blueberry fruit, 100 VcGST genes were highly expressed, and the expression patterns of 24 of these genes demonstrated a strong correlation with the dynamic content of fruit anthocyanins. Further analysis identified VcGSTF8, VcGSTF20, and VcGSTF22 as prime candidates of VcGST genes involved in the anthocyanin intracellular transport. This study provides a reference for the exploration of anthocyanin intracellular transport mechanisms and paves the way for investigating the spectrum of GST functions in blueberries.
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Affiliation(s)
- Xuxiang Wang
- College of Life Sciences, Zhejiang Normal University, Jinhua 321004, China; (X.W.); (J.D.); (Y.H.); (Q.H.); (X.L.); (Y.H.); (M.S.); (L.C.); (B.X.); (Y.L.)
| | - Jiajia Dong
- College of Life Sciences, Zhejiang Normal University, Jinhua 321004, China; (X.W.); (J.D.); (Y.H.); (Q.H.); (X.L.); (Y.H.); (M.S.); (L.C.); (B.X.); (Y.L.)
| | - Yiting Hu
- College of Life Sciences, Zhejiang Normal University, Jinhua 321004, China; (X.W.); (J.D.); (Y.H.); (Q.H.); (X.L.); (Y.H.); (M.S.); (L.C.); (B.X.); (Y.L.)
| | - Qiaoyu Huang
- College of Life Sciences, Zhejiang Normal University, Jinhua 321004, China; (X.W.); (J.D.); (Y.H.); (Q.H.); (X.L.); (Y.H.); (M.S.); (L.C.); (B.X.); (Y.L.)
| | - Xiaoying Lu
- College of Life Sciences, Zhejiang Normal University, Jinhua 321004, China; (X.W.); (J.D.); (Y.H.); (Q.H.); (X.L.); (Y.H.); (M.S.); (L.C.); (B.X.); (Y.L.)
| | - Yilin Huang
- College of Life Sciences, Zhejiang Normal University, Jinhua 321004, China; (X.W.); (J.D.); (Y.H.); (Q.H.); (X.L.); (Y.H.); (M.S.); (L.C.); (B.X.); (Y.L.)
| | - Mingyang Sheng
- College of Life Sciences, Zhejiang Normal University, Jinhua 321004, China; (X.W.); (J.D.); (Y.H.); (Q.H.); (X.L.); (Y.H.); (M.S.); (L.C.); (B.X.); (Y.L.)
| | - Lijun Cao
- College of Life Sciences, Zhejiang Normal University, Jinhua 321004, China; (X.W.); (J.D.); (Y.H.); (Q.H.); (X.L.); (Y.H.); (M.S.); (L.C.); (B.X.); (Y.L.)
| | - Buhuai Xu
- College of Life Sciences, Zhejiang Normal University, Jinhua 321004, China; (X.W.); (J.D.); (Y.H.); (Q.H.); (X.L.); (Y.H.); (M.S.); (L.C.); (B.X.); (Y.L.)
| | - Yongqiang Li
- College of Life Sciences, Zhejiang Normal University, Jinhua 321004, China; (X.W.); (J.D.); (Y.H.); (Q.H.); (X.L.); (Y.H.); (M.S.); (L.C.); (B.X.); (Y.L.)
- Zhejiang Provincial Key Laboratory of Biotechnology on Specialty Economic Plants, Zhejiang Normal University, Jinhua 321004, China
| | - Yu Zong
- College of Life Sciences, Zhejiang Normal University, Jinhua 321004, China; (X.W.); (J.D.); (Y.H.); (Q.H.); (X.L.); (Y.H.); (M.S.); (L.C.); (B.X.); (Y.L.)
- Zhejiang Provincial Key Laboratory of Biotechnology on Specialty Economic Plants, Zhejiang Normal University, Jinhua 321004, China
| | - Weidong Guo
- College of Life Sciences, Zhejiang Normal University, Jinhua 321004, China; (X.W.); (J.D.); (Y.H.); (Q.H.); (X.L.); (Y.H.); (M.S.); (L.C.); (B.X.); (Y.L.)
- Zhejiang Provincial Key Laboratory of Biotechnology on Specialty Economic Plants, Zhejiang Normal University, Jinhua 321004, China
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Mo Z, Huang Y, Pu T, Duan L, Pi K, Luo J, Long B, Lu A, Liu R. Genome-wide identification and characterization of Glutathione S-Transferases (GSTs) and their expression profile under abiotic stresses in tobacco (Nicotiana tabacum L.). BMC Genomics 2023; 24:341. [PMID: 37344758 DOI: 10.1186/s12864-023-09450-x] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/24/2022] [Accepted: 06/14/2023] [Indexed: 06/23/2023] Open
Abstract
BACKGROUND Glutathione S-transferases (GSTs) are large and multifunctional proteases that play an important role in detoxification, protection against biotic and abiotic stresses, and secondary metabolite transportation which is essential for plant growth and development. However, there is limited research on the identification and function of NtGSTs. RESULTS This study uses K326 and other six tobacco varieties (Hongda, HG, GDH11, Va116, VG, and GDH88) as materials to conduct comprehensive genome-wide identification and functional characterization of the GST gene in tobacco. A total of 59 NtGSTs were identified and classified into seven subfamilies via the whole-genome sequence analysis, with the Tau type serving as the major subfamily. The NtGSTs in the same branch of the evolutionary tree had similar exon/intron structure and motif constitution. There were more than 42 collinear blocks between tobacco and pepper, tomato, and potato, indicating high homology conservation between them. Twelve segmental duplicated gene pairs and one tandem duplication may have had a substantial impact on the evolution and expansion of the tobacco GST gene family. The RT-qPCR results showed that the expression patterns of NtGSTs varied significantly among tissues, varieties, and multiple abiotic stresses, suggesting that NtGST genes may widely respond to various abiotic stresses and hormones in tobacco, including NtGSTF4, NtGSTL1, NtGSTZ1, and NtGSTU40. CONCLUSIONS This study provides a comprehensive analysis of the NtGST gene family, including structures and functions. Many NtGSTs play a critical regulatory role in tobacco growth and development, and responses to abiotic stresses. These findings offer novel and valuable insights for understanding the biological function of NtGSTs and the reference materials for cultivating highly resistant varieties and enhancing the yield and quality of crops.
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Affiliation(s)
- Zejun Mo
- College of Tobacco, Guizhou University, Guiyang, China
- Key Laboratory of Tobacco Quality in Guizhou Province, Guiyang, China
| | - Ying Huang
- College of Tobacco, Guizhou University, Guiyang, China
- Key Laboratory of Tobacco Quality in Guizhou Province, Guiyang, China
| | - Tianxiunan Pu
- College of Tobacco, Guizhou University, Guiyang, China
- Key Laboratory of Tobacco Quality in Guizhou Province, Guiyang, China
| | - Lili Duan
- Key Laboratory of Tobacco Quality in Guizhou Province, Guiyang, China
- College of Agriculture, Guizhou University, Guiyang, China
| | - Kai Pi
- College of Tobacco, Guizhou University, Guiyang, China
- Key Laboratory of Tobacco Quality in Guizhou Province, Guiyang, China
| | - Jiajun Luo
- College of Tobacco, Guizhou University, Guiyang, China
- Key Laboratory of Tobacco Quality in Guizhou Province, Guiyang, China
| | - Benshan Long
- College of Tobacco, Guizhou University, Guiyang, China
- Key Laboratory of Tobacco Quality in Guizhou Province, Guiyang, China
| | - Anbin Lu
- College of Tobacco, Guizhou University, Guiyang, China
- Key Laboratory of Tobacco Quality in Guizhou Province, Guiyang, China
| | - Renxiang Liu
- College of Tobacco, Guizhou University, Guiyang, China.
- Key Laboratory of Tobacco Quality in Guizhou Province, Guiyang, China.
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Casey A, Dolan L. Genes encoding cytochrome P450 monooxygenases and glutathione S-transferases associated with herbicide resistance evolved before the origin of land plants. PLoS One 2023; 18:e0273594. [PMID: 36800395 PMCID: PMC9937507 DOI: 10.1371/journal.pone.0273594] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/10/2022] [Accepted: 02/06/2023] [Indexed: 02/18/2023] Open
Abstract
Cytochrome P450 (CYP) monooxygenases and glutathione S-transferases (GST) are enzymes that catalyse chemical modifications of a range of organic compounds. Herbicide resistance has been associated with higher levels of CYP and GST gene expression in some herbicide-resistant weed populations compared to sensitive populations of the same species. By comparing the protein sequences of 9 representative species of the Archaeplastida-the lineage which includes red algae, glaucophyte algae, chlorophyte algae, and streptophytes-and generating phylogenetic trees, we identified the CYP and GST proteins that existed in the common ancestor of the Archaeplastida. All CYP clans and all but one land plant GST classes present in land plants evolved before the divergence of streptophyte algae and land plants from their last common ancestor. We also demonstrate that there are more genes encoding CYP and GST proteins in land plants than in algae. The larger numbers of genes among land plants largely results from gene duplications in CYP clans 71, 72, and 85 and in the GST phi and tau classes [1,2]. Enzymes that either metabolise herbicides or confer herbicide resistance belong to CYP clans 71 and 72 and the GST phi and tau classes. Most CYP proteins that have been shown to confer herbicide resistance are members of the CYP81 family from clan 71. These results demonstrate that the clan and class diversity in extant plant CYP and GST proteins had evolved before the divergence of land plants and streptophyte algae from a last common ancestor estimated to be between 515 and 474 million years ago. Then, early in embryophyte evolution during the Palaeozoic, gene duplication in four of the twelve CYP clans, and in two of the fourteen GST classes, led to the large numbers of CYP and GST proteins found in extant land plants. It is among the genes of CYP clans 71 and 72 and GST classes phi and tau that alleles conferring herbicide resistance evolved in the last fifty years.
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Affiliation(s)
- Alexandra Casey
- Gregor Mendel Institute, Vienna, Austria
- Department of Plant Sciences, University of Oxford, Oxford, Oxfordshire, United Kingdom
| | - Liam Dolan
- Gregor Mendel Institute, Vienna, Austria
- Department of Plant Sciences, University of Oxford, Oxford, Oxfordshire, United Kingdom
- * E-mail:
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Helvecio E, Romão TP, de Carvalho-Leandro D, de Oliveira IF, Cavalcanti AEHD, Reimer L, de Paiva Cavalcanti M, de Oliveira APS, Paiva PMG, Napoleão TH, Wallau GL, de Melo Neto OP, Melo-Santos MAV, Ayres CFJ. Polymorphisms in GSTE2 is associated with temephos resistance in Aedes aegypti. PESTICIDE BIOCHEMISTRY AND PHYSIOLOGY 2020; 165:104464. [PMID: 32359546 DOI: 10.1016/j.pestbp.2019.10.002] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/09/2019] [Revised: 09/10/2019] [Accepted: 10/13/2019] [Indexed: 06/11/2023]
Abstract
The glutathione S-transferases (GSTs) are enzymes involved in several distinct biological processes. In insects, the GSTs, especially delta and epsilon classes, play a key role in the metabolism of xenobiotics used to control insect populations. Here, we investigated its potential role in temephos resistance, examining the GSTE2 gene from susceptible (RecL) and resistant (RecR) strains of the mosquito Aedes aegypti, vector for several pathogenic arboviruses. Total GST enzymatic activity and the GSTE2 gene expression profile were evaluated, with the GSTE2 cDNA and genomic loci sequenced from both strains. Recombinant GSTE2 and mutants were produced in a heterologous expression system and assayed for enzyme kinetic parameters. These proteins also had their 3D structure predicted through molecular modeling. Our results showed that RecR has a profile of total GST enzymatic activity higher than RecL, with the expression of the GSTE2 gene in resistant larvae increasing six folds. Four exclusive RecR mutations were observed (L111S, I150V, E178A and A198E), which were absent in the laboratory susceptible strains. The enzymatic activity of the recombinant GSTE2 showed different kinetic parameters, with the GSTE2 RecR showing an enhanced ability to metabolize its substrate. The I150V mutation was shown to induce significant changes in catalytic parameters and a 3D modeling of GSTE2 mapped two of the RecR changes (L111S and I150V) near the enzyme's catalytic pocket, also implying an impact on its catalytic activity. Our results reinforce a potential role for GSTE2 in the metabolic resistance phenotype while contributing to the understanding of the molecular basis for the resistance mechanism.
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Affiliation(s)
- Elisama Helvecio
- Department of Entomology, Instituto Aggeu Magalhães, FIOCRUZ, Recife, PE 50740-465, Brazil
| | - Tatiany Patrícia Romão
- Department of Entomology, Instituto Aggeu Magalhães, FIOCRUZ, Recife, PE 50740-465, Brazil.
| | | | | | | | - Lisa Reimer
- Department of Vector Biology, Liverpool School of Tropical Medicine, United Kingdom
| | | | | | | | | | - Gabriel Luz Wallau
- Department of Entomology, Instituto Aggeu Magalhães, FIOCRUZ, Recife, PE 50740-465, Brazil
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Li D, Gao Q, Xu L, Pang S, Liu Z, Wang C, Tan W. Characterization of glutathione S-transferases in the detoxification of metolachlor in two maize cultivars of differing herbicide tolerance. PESTICIDE BIOCHEMISTRY AND PHYSIOLOGY 2017; 143:265-271. [PMID: 29183603 DOI: 10.1016/j.pestbp.2016.12.003] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/02/2016] [Revised: 11/28/2016] [Accepted: 12/05/2016] [Indexed: 05/27/2023]
Abstract
Glutathione S-transferases (GSTs) have been widely studied in relation to their role in herbicide tolerance and detoxification. However, a detailed characterization of GSTs from herbicide tolerant and sensitive maize cultivars is still lacking. In this study, we determined the mechanism of differential tolerance between two maize cultivars which had 4-fold difference tolerance to metolachlor. The metabolism rate of metolachlor was more rapid in the tolerant cultivar (Zea mays L. cv Nongda86) than the susceptible one (Zea mays L. cv Zhengda958). Addition of the GST inhibitor ethacrynic acid reduced the metabolism of metolachlor indicating the involvement of GSTs in the differential detoxification of metolachlor. The expression profiles of 32 GST isozymes were measured using quantitative RT-PCR. The results showed the expression of GST genes were slightly up-regulated in Nongda86, but severely inhibited in Zhengdan958 24h after metolachlor treatment. The genes GSTI, GSTIII, GSTIV, GST5, GST6 and GST7, which can detoxify chloroacetanilide herbicides, were all expressed higher in Nongda86 compared to Zhendgan958. The result of GST activity was consistent with the gene expression profiles. Collectively, higher-level expression of GST genes, leading to higher GST activity and faster herbicide detoxification, appears to be responsible for the difference in tolerance to metolachlor in two maize cultivars.
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Affiliation(s)
- Dongzhi Li
- Engineering Research Centre of Plant Growth Regulators, Ministry of Education, College of Science, China Agricultural University, Beijing, PR China
| | | | - Li Xu
- Engineering Research Centre of Plant Growth Regulators, Ministry of Education, College of Science, China Agricultural University, Beijing, PR China
| | - Sen Pang
- Engineering Research Centre of Plant Growth Regulators, Ministry of Education, College of Science, China Agricultural University, Beijing, PR China
| | - Zhiqian Liu
- Department of Economic Development, Jobs, Transport and Resources, AgriBio, 5 Ring Road, Bundoora, Victoria 3083, Australia
| | - Chengju Wang
- Engineering Research Centre of Plant Growth Regulators, Ministry of Education, College of Science, China Agricultural University, Beijing, PR China.
| | - Weiming Tan
- Engineering Research Centre of Plant Growth Regulators, Ministry of Education, College of Agronomy and Biotechnology, China Agricultural University, Beijing, PR China.
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Li D, Xu L, Pang S, Liu Z, Wang K, Wang C. Variable Levels of Glutathione S-Transferases Are Responsible for the Differential Tolerance to Metolachlor between Maize (Zea mays) Shoots and Roots. JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY 2017; 65:39-44. [PMID: 27992212 DOI: 10.1021/acs.jafc.6b04129] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/18/2023]
Abstract
Glutathione S-transferases (GSTs) play important roles in herbicide tolerance. However, studies on GST function in herbicide tolerance among plant tissues are still lacking. To explore the mechanism of metolachlor tolerance difference between maize shoots and roots, the effects of metolachlor on growth, GST activity, and the expression of the entire GST gene family were investigated. It was found that this differential tolerance to metolachlor was correlated with contrasting GST activity between the two tissues and can be eliminated by a GST inhibitor. An in vitro metolachlor-glutathione conjugation assay confirmed that the transformation of metolachlor is 2-fold faster in roots than in shoots. The expression analysis of the GST gene family revealed that most GST genes are expressed much higher in roots than shoots, both in control and in metolachlor-treated plants. Taken together, higher level expression of most GST genes, leading to higher GST activity and faster herbicide transformation, appears to be responsible for the higher tolerance to metolachlor of maize roots than shoots.
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Affiliation(s)
- Dongzhi Li
- College of Science, China Agricultural University , No. 2 Yuan Ming Yuan West Road, Haidian District, Beijing 100193, People's Republic of China
| | - Li Xu
- College of Science, China Agricultural University , No. 2 Yuan Ming Yuan West Road, Haidian District, Beijing 100193, People's Republic of China
| | - Sen Pang
- College of Science, China Agricultural University , No. 2 Yuan Ming Yuan West Road, Haidian District, Beijing 100193, People's Republic of China
| | - Zhiqian Liu
- Department of Economic Development, Jobs, Transport and Resources, AgriBio , 5 Ring Road, Bundoora, Victoria 3083, Australia
| | - Kai Wang
- College of Science, China Agricultural University , No. 2 Yuan Ming Yuan West Road, Haidian District, Beijing 100193, People's Republic of China
| | - Chengju Wang
- College of Science, China Agricultural University , No. 2 Yuan Ming Yuan West Road, Haidian District, Beijing 100193, People's Republic of China
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7
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In vitro activation and inhibition of recombinant EGFR tyrosine kinase expressed in Escherichia coli. ScientificWorldJournal 2013; 2013:807284. [PMID: 24187524 PMCID: PMC3800664 DOI: 10.1155/2013/807284] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/06/2013] [Accepted: 09/04/2013] [Indexed: 11/24/2022] Open
Abstract
The present work concerns the heterologous expression of the intracellular domain harbouring the tyrosine kinase activity of the epidermal growth factor receptor (EGFR). Protein expression was improved thanks to the deletion of a 13-amino acid peptide of the juxtamembrane region (JM). The recombinant proteins were produced as a glutathione S-transferase (GST) fusion in Escherichia coli, and the solubilisation was performed by sarkosyl addition during extraction. The produced proteins spontaneously dimerize allowing the activation of the tyrosine kinase domain in the presence of [γ-32P]ATP. The activity assay has revealed the autophosphorylation of EGFR proteins which was decreased in the presence of genistein. Our system could facilitate the screening of EGFR inhibitors without the need of adding an exogenous substrate.
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Lee JJ, Jo HJ, Kong KH. A Plant-specific Tau Class Glutathione S-transferase from Oryza sativa Having Significant Detoxification Activity Towards Chloroacetanilide Herbicides. B KOREAN CHEM SOC 2011. [DOI: 10.5012/bkcs.2011.32.10.3756] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
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Cummins I, Dixon DP, Freitag-Pohl S, Skipsey M, Edwards R. Multiple roles for plant glutathione transferases in xenobiotic detoxification. Drug Metab Rev 2011; 43:266-80. [PMID: 21425939 DOI: 10.3109/03602532.2011.552910] [Citation(s) in RCA: 220] [Impact Index Per Article: 16.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022]
Abstract
Discovered 40 years ago, plant glutathione transferases (GSTs) now have a well-established role in determining herbicide metabolism and selectivity in crops and weeds. Within the GST superfamily, the numerous and plant-specific phi (F) and tau (U) classes are largely responsible for catalyzing glutathione-dependent reactions with xenobiotics, notably conjugation leading to detoxification and, more rarely, bioactivating isomerizations. In total, the crystal structures of 10 plant GSTs have been solved and a highly conserved N-terminal glutathione binding domain and structurally diverse C-terminal hydrophobic domain identified, along with key coordinating residues. Unlike drug-detoxifying mammalian GSTs, plant enzymes utlilize a catalytic serine in place of a tyrosine residue. Both GSTFs and GSTUs undergo changes in structure during catalysis indicative of an induced fit mechanism on substrate binding, with an understanding of plant GST structure/function allowing these proteins to be engineered for novel functions in detoxification and ligand recognition. Several major crops produce alternative thiols, with GSTUs shown to use homoglutathione in preference to glutathione, in herbicide detoxification reactions in soybeans. Similarly, hydroxymethylglutathione is used, in addition to glutathione in detoxifying the herbicide fenoxaprop in wheat. Following GST action, plants are able to rapidly process glutathione conjugates by at least two distinct pathways, with the available evidence suggesting these function in an organ- and species-specific manner. Roles for GSTs in endogenous metabolism are less well defined, with the enzymes linked to a diverse range of functions, including signaling, counteracting oxidative stress, and detoxifying and transporting secondary metabolites.
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Affiliation(s)
- Ian Cummins
- Center for Bioactive Chemistry, Durham University, Durham, United Kingdom
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Wang CL, Yang HL. Conserved residues in the subunit interface of tau glutathione s-transferase affect catalytic and structural functions. JOURNAL OF INTEGRATIVE PLANT BIOLOGY 2011; 53:35-43. [PMID: 21205172 DOI: 10.1111/j.1744-7909.2010.01005.x] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/30/2023]
Abstract
The tau class glutathione S-transferases (GSTs) have important roles in stress tolerance and the detoxification of herbicides in crops and weeds. Structural investigations of a wheat tau GST (TaGSTU4) show two subunit interactions: a hydrogen bond between the Tyr93 and Pro65 from another subunit of the dimer, and two salt bridges between residues Glu78 and side chains of Arg95 and Arg99 in the opposite subunit. By investigating enzyme activities, kinetic parameters and structural characterizations, this study showed the following results: (i) the hydrogen bond interaction between the Tyr93 and Pro65 was not essential for dimerization, but contributed to the enzyme's catalytic activity, thermal stability and affinity towards substrates glutathione and 1-chloro-2, 4-dinitrobenzene; and (ii) two salt bridges mainly contributed to the protein structure stability and catalysis. The results of this study form a structural and functional basis for rational design of more selective and environmentally friendly herbicides.
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Affiliation(s)
- Cai-Ling Wang
- College of Life Sciences and Biotechnology, Beijing Forestry University, Beijing 100083, China
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11
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Banerjee S, Goswami R. GST profile expression study in some selected plants: in silico approach. Mol Cell Biochem 2010; 336:109-26. [PMID: 20135200 DOI: 10.1007/s11010-010-0384-y] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/09/2009] [Accepted: 09/15/2009] [Indexed: 11/29/2022]
Abstract
Glutathione acts as a protein disulphide reductant, which detoxifies herbicides by conjugation, either spontaneously or by the activity of one of a number of glutathione-S-transferases (GSTs), and regulates gene expression in response to environmental stress and pathogen attack. GSTs play roles in both normal cellular metabolisms as well as in the detoxification of a wide variety of xenobiotic compounds, and they have been intensively studied with regard to herbicide detoxification in plants. A newly discovered plant GST subclass has been implicated in numerous stress responses, including those arising from pathogen attack, oxidative stress and heavy-metal toxicity. In addition, plants GSTs play a role in the cellular response to auxins and during the normal metabolism of plant secondary products like anthocyanins and cinnamic acid. The present work involves two in silico analytical approaches-general secondary structure prediction studies of the proteins and detailed signature pattern studies of some selected GST classes in Arabdiopsis thaliana, mustard, maize and bread wheat by standard Bioinformatics tools; structure prediction tools; signature pattern tools; and the evolutionary trends were analyzed by ClustalW. For this purpose, sequences were obtained from standard databases. The work reveals that these proteins are mainly alpha helical in nature with specific signature pattern similar to phosphokinase C, tyrosine kinase and casein kinase II proteins, which are closely related to plant oxidative stress. This study aims to comprehend the relationship of GST gene family and plant oxidative stress with respect to certain specific conserved motifs, which may help in future studies for screening of biomodulators involved in plant stress metabolism.
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Affiliation(s)
- Soma Banerjee
- Department of Biotechnology, Heritage Institute of Technology, Chowbaga Road, Anandapur. P.O. East Kolkata Township, Kolkata, 700107, India.
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Lan T, Yang ZL, Yang X, Liu YJ, Wang XR, Zeng QY. Extensive functional diversification of the Populus glutathione S-transferase supergene family. THE PLANT CELL 2009; 21:3749-66. [PMID: 19996377 PMCID: PMC2814494 DOI: 10.1105/tpc.109.070219] [Citation(s) in RCA: 103] [Impact Index Per Article: 6.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/24/2009] [Revised: 10/31/2009] [Accepted: 11/16/2009] [Indexed: 05/17/2023]
Abstract
Identifying how genes and their functions evolve after duplication is central to understanding gene family radiation. In this study, we systematically examined the functional diversification of the glutathione S-transferase (GST) gene family in Populus trichocarpa by integrating phylogeny, expression, substrate specificity, and enzyme kinetic data. GSTs are ubiquitous proteins in plants that play important roles in stress tolerance and detoxification metabolism. Genome annotation identified 81 GST genes in Populus that were divided into eight classes with distinct divergence in their evolutionary rate, gene structure, expression responses to abiotic stressors, and enzymatic properties of encoded proteins. In addition, when all the functional parameters were examined, clear divergence was observed within tandem clusters and between paralogous gene pairs, suggesting that subfunctionalization has taken place among duplicate genes. The two domains of GST proteins appear to have evolved under differential selective pressures. The C-terminal domain seems to have been subject to more relaxed functional constraints or divergent directional selection, which may have allowed rapid changes in substrate specificity, affinity, and activity, while maintaining the primary function of the enzyme. Our findings shed light on mechanisms that facilitate the retention of duplicate genes, which can result in a large gene family with a broad substrate spectrum and a wide range of reactivity toward different substrates.
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Affiliation(s)
- Ting Lan
- State Key Laboratory of Systematic and Evolutionary Botany, Institute of Botany, Chinese Academy of Sciences, Beijing 100093, China
- Graduate School, Chinese Academy of Sciences, Beijing 100049, China
| | - Zhi-Ling Yang
- State Key Laboratory of Systematic and Evolutionary Botany, Institute of Botany, Chinese Academy of Sciences, Beijing 100093, China
- Graduate School, Chinese Academy of Sciences, Beijing 100049, China
| | - Xue Yang
- State Key Laboratory of Systematic and Evolutionary Botany, Institute of Botany, Chinese Academy of Sciences, Beijing 100093, China
- Graduate School, Chinese Academy of Sciences, Beijing 100049, China
| | - Yan-Jing Liu
- State Key Laboratory of Systematic and Evolutionary Botany, Institute of Botany, Chinese Academy of Sciences, Beijing 100093, China
| | - Xiao-Ru Wang
- State Key Laboratory of Systematic and Evolutionary Botany, Institute of Botany, Chinese Academy of Sciences, Beijing 100093, China
- Department of Ecology and Environmental Science, Umeå Plant Science Centre, Umeå University, SE-901 87 Umeå, Sweden
| | - Qing-Yin Zeng
- State Key Laboratory of Systematic and Evolutionary Botany, Institute of Botany, Chinese Academy of Sciences, Beijing 100093, China
- Address correspondence to
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Lo Piero AR, Mercurio V, Puglisi I, Petrone G. Different roles of functional residues in the hydrophobic binding site of two sweet orange tau glutathione S-transferases. FEBS J 2009; 277:255-62. [PMID: 19954490 DOI: 10.1111/j.1742-4658.2009.07481.x] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
Glutathione S-transferases (GSTs) catalyze the conjugation of glutathione to hydrophobic compounds, contributing to the metabolism of toxic chemicals. In this study, we show that two naturally occurring tau GSTs (GSTUs) exhibit distinctive kinetic parameters towards 1-chloro-2,4-dinitrobenzene (CDNB), although they differ only in three amino acids (Arg89, Glu117 and Ile172 in GSTU1 are replaced by Pro89, Lys117 and Val172 in GSTU2). In order to understand the effects of the single mismatched residues, several mutant GSTs were generated through site-directed mutagenesis. The analysis of the kinetic parameters of the mutants led to the conclusion that Glu117 provides a critical contribution to the maintenance of a high-affinity CDNB-binding site. However, the substitution E117K gives rise to mutants showing increased k(cat) values for CDNB, suggesting that Lys117 might positively influence the formation of the transition state during catalysis. No changes in the K(m) values towards glutathione were found between the naturally occurring GSTs and mutants, except for the mutant caused by the substitution R89P in GSTU1, which showed a sharp increase in K(m). Moreover, the analysis of enzyme reactivation after denaturation showed that this R89P substitution leads to a two-fold enhancement of the refolded enzyme yield, suggesting that the insertion of proline might induce critical structural modifications. In contrast, the substitution P89R in GSTU2 does not modify the reactivation yield and does not impair the affinity of the mutant for glutathione, suggesting that all three residues investigated in this work are fundamental in the creation of enzymes characterized by unique biochemical properties.
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Affiliation(s)
- Angela R Lo Piero
- Dipartimento di Scienze Agronomiche, Agrochimiche e delle Produzioni Animali, Università di Catania, Catania, Italy.
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Yang X, Sun W, Liu JP, Liu YJ, Zeng QY. Biochemical and physiological characterization of a tau class glutathione transferase from rice (Oryza sativa). PLANT PHYSIOLOGY AND BIOCHEMISTRY : PPB 2009; 47:1061-8. [PMID: 19640724 DOI: 10.1016/j.plaphy.2009.07.003] [Citation(s) in RCA: 26] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/27/2008] [Revised: 06/01/2009] [Accepted: 07/06/2009] [Indexed: 05/08/2023]
Abstract
The classical phase II detoxification glutathione transferases (GSTs) are key metabolic enzymes that catalyze the conjugation of glutathione to various electrophilic compounds. A tau class GST gene (OsGSTU17) was cloned from rice, which encodes a protein of 223 amino acid residues with a calculated molecular mass of 25.18 kDa. The recombinant OsGSTU17 formed a homodimer protein and showed GSH-conjugating activity with various xenobiotics. Kinetic analysis with respect to NBD-Cl as substrate revealed a K(m) of 0.324 mM and V(max) of 0.219 micromol/min per mg of protein. The enzyme had a maximum activity at pH 7.5, and a high thermal stability with 81% of its initial activity at 55 degrees C for 15 min. Site-directed mutagenesis revealed that Ser15 in the N-terminal domain is a critical catalytic residue, responsible for stabilisation of the thiolate anion of enzyme-bound glutathione. OsGSTU17 mRNA was expressed in different tissues of rice, both above and below ground. The relative transcript levels of OsGSTU17 mRNA varied significantly among the tissues in response to CDNB, hydrogen peroxide and atrazine treatments, indicating the gene has diverse regulation mechanisms in response to abiotic stresses.
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Affiliation(s)
- Xue Yang
- State Key Laboratory of Systematic and Evolutionary Botany, Institute of Botany, Chinese Academy of Sciences, Beijing 100093, China
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15
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Dixon DP, Lapthorn A, Madesis P, Mudd EA, Day A, Edwards R. Binding and glutathione conjugation of porphyrinogens by plant glutathione transferases. J Biol Chem 2008; 283:20268-76. [PMID: 18492666 DOI: 10.1074/jbc.m802026200] [Citation(s) in RCA: 42] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022] Open
Abstract
Overexpression in Escherichia coli of a tau (U) class glutathione transferase (GST) from maize (Zea mays L.), termed ZmGSTU1, caused a reduction in heme levels and an accumulation of porphyrin precursors. This disruption was highly specific, with the expression of the closely related ZmGSTU2 or other maize GSTs having little effect. Expression in E. coli of a series of chimeric ZmGSTU1/ZmGSTU2 proteins identified domains responsible for disrupting porphyrin metabolism. In addition to known heme precursors, expression of ZmGSTU1 led to the accumulation of a novel glutathione conjugate of harderoporphyrin(ogen) (2,7,12,18-tetramethyl-3-vinylporphyrin-8,13,17-tripropionic acid). Using the related protoporphyrinogen as a substrate, conjugation could be shown to occur on one vinyl group and was actively catalyzed by the ZmGSTU. In plant transgenesis studies, the ZmGSTUs did not perturb porphyrin metabolism when expressed in the cytosol of Arabidopsis or tobacco. However, expression of a ZmGSTU1-ZmGSTU2 chimera in the chloroplasts of tobacco resulted in the accumulation of the harderoporphyrin(ogen)-glutathione conjugate observed in the expression studies in bacteria. Our results show that the well known ability of GSTs to act as ligand binding (ligandin) proteins of porphyrins in vitro results in highly specific interactions with porphyrinogen intermediates, which can be demonstrated in both plants and bacteria in vivo.
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Affiliation(s)
- David P Dixon
- Centre for Bioactive Chemistry, School of Biological and Biomedical Sciences, Durham University, Durham, UK
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16
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Li Z, Wang X, Ma J, Zhang G, Ma Z. Cloning and characterization of a tau glutathione S-transferase subunit encoding gene in Gossypium hirsutum. Genes Genet Syst 2008; 83:219-25. [DOI: 10.1266/ggs.83.219] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022] Open
Affiliation(s)
- Zhikun Li
- Key Laboratory of Crop Germplasm Resources of Hebei, Agricultural University of Hebei
| | - Xingfen Wang
- Key Laboratory of Crop Germplasm Resources of Hebei, Agricultural University of Hebei
| | - Jun Ma
- Key Laboratory of Crop Germplasm Resources of Hebei, Agricultural University of Hebei
| | - Guiyin Zhang
- Key Laboratory of Crop Germplasm Resources of Hebei, Agricultural University of Hebei
| | - Zhiying Ma
- Key Laboratory of Crop Germplasm Resources of Hebei, Agricultural University of Hebei
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Del Buono D, Scarponi L, Espen L. Glutathione S-transferases in Festuca arundinacea: identification, characterization and inducibility by safener benoxacor. PHYTOCHEMISTRY 2007; 68:2614-24. [PMID: 17640691 DOI: 10.1016/j.phytochem.2007.05.041] [Citation(s) in RCA: 24] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/21/2007] [Revised: 05/25/2007] [Accepted: 05/25/2007] [Indexed: 05/16/2023]
Abstract
Over recent years it has emerged how certain no crop-species can be employed in phytoremediating contaminated soils or preventing herbicide pollution; in this contest Festuca arundinacea was investigated. Shoots of Festuca were submitted to fast protein liquid chromatography in order to identify their glutathione S-transferases (GST; EC 2.5.1.18), by a combination of anionic, affinity and RP-HPLC chromatography. The chromatographic procedure revealed satisfactory yield and four GSTs were identified: they were named FaGST I, FaGST II, FaGST III and FaGST IV. Among these, significant differences were observed in the chromatographic behaviours, structure, activity toward a "model" substrate, 1-chloro-2,4-dinitrobenzene, and responsiveness to the herbicide safener benoxacor. FaGST I showed the highest activity toward the above substrate, and this activity was up-regulated by the herbicide safener. Therefore, FaGST I was purified till homogeneity and was determined to be an heterodimer consisting of two subunits of 28.0 and 27.2kDa. Each subunit of FaGST I was further characterized by means of LC-ESI-MS/MS and immunoblotting analysis, which revealed that both the subunits belong to the tau subclass.
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Affiliation(s)
- Daniele Del Buono
- Dipartimento di Scienze Agrarie e Ambientali, Università degli Studi di Perugia, Borgo XX Giugno 72, 06121 Perugia, Italy
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18
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Zeng QY, Wang XR. Divergence in structure and function of tau class glutathione transferase from Pinus tabulaeformis, P. yunnanensis and P. densata. BIOCHEM SYST ECOL 2006. [DOI: 10.1016/j.bse.2006.04.004] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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Abstract
Soluble plant glutathione transferases (GSTs) consist of seven distinct classes, six of which have been functionally characterized. The phi and tau class GSTs are specific to plants and the most numerous and abundant of these enzymes. Both have classic conjugating activities toward a diverse range of xenobiotics, including pesticides, where they are major determinants of herbicide selectivity in crops and weeds. In contrast, the zeta and theta class GSTs are conserved in animals and plants and have very restricted activities toward xenobiotics. Theta GSTs function as glutathione peroxidases, reducing organic hydroperoxides produced during oxidative stress. Zeta GSTs act as glutathione-dependent isomerases, catalyzing the conversion of maleylacetoacetate to fumarylacetoacetate, the penultimate step in tyrosine degradation. The other two classes of plant GSTs, the dehydroascorbate reductases (DHARs) and lambda GSTs, differ from phi, tau, zeta, and theta enzymes in being monomers rather than dimers and possessing a catalytic cysteine rather than serine in the active site. Both can function as thioltransferases, with the DHARs having a specialized function in reducing dehydroascorbate to ascorbic acid. The determination of the diverse plant-specific functions of the differing GST classes is described.
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Affiliation(s)
- Robert Edwards
- Centre for Bioactive Chemistry, School of Biological and Biomedical Sciences, Durham University, United Kingdom
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Karavangeli M, Labrou NE, Clonis YD, Tsaftaris A. Development of transgenic tobacco plants overexpressing maize glutathione S-transferase I for chloroacetanilide herbicides phytoremediation. BIOMOLECULAR ENGINEERING 2005; 22:121-8. [PMID: 16085457 DOI: 10.1016/j.bioeng.2005.03.001] [Citation(s) in RCA: 99] [Impact Index Per Article: 5.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/14/2005] [Revised: 02/25/2005] [Accepted: 03/01/2005] [Indexed: 11/27/2022]
Abstract
Glutathione S-transferases (GSTs, EC 2.5.1.18) are a multigene family of detoxification enzymes that biotransform a wide variety of endogenous and exogenous electrophilic substrates, including herbicides. The isozyme GST I from maize exhibits significant catalytic activity for the chloroacetanilide herbicide alachlor and appears to be involved in its detoxifying process. To establish the in planta ability of GST I to detoxify from alachlor, transgenesis studies were carried out. The gene gstI-6His, which encodes for 6His-tagged GST I, was used for the construction of a binary vector suitable for genetic engineering of tobacco plants (Nicotiana tabacum). Through biolistic method transgenic tobacco plants were obtained. Integration of gstI-6His gene in transgenic tobacco plants genome was confirmed by polymerase chain reaction and Southern blot hybridization. The expression of active GST I was established by Western blot analysis, using anti-6His antibody, and by direct purification of 6-His tagged GST I on Ni-NTA agarose. Primary transformed plants harboring the gstI-6His gene were transferred to MS medium supplemented with alachlor and their phenotype was evaluated. The transgenic plants showed substantially higher tolerance to alachlor compared to non-transgenic plants in terms of root, leaves and vigorous development. These transgenic plants are potentially useful biotechnological tools for the development of phytoremediation system for the degradation of herbicide pollutants in agricultural fields.
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Affiliation(s)
- Margarita Karavangeli
- Laboratory of Genetics and Plant Breeding, Aristotle University of Thessaloniki, Thessaloniki GR-54124, Greece
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Zeng QY, Lu H, Wang XR. Molecular characterization of a glutathione transferase from Pinus tabulaeformis (Pinaceae). Biochimie 2005; 87:445-55. [PMID: 15820751 DOI: 10.1016/j.biochi.2005.01.002] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/20/2004] [Accepted: 01/07/2005] [Indexed: 11/24/2022]
Abstract
Glutathione transferases (GSTs) play important roles in stress tolerance and detoxification metabolism in plants. To date, studies on GSTs in higher plants have focused largely on agricultural plants. In contrast, there is virtually no information on the molecular characteristics of GSTs in gymnosperms. The present study reports for the first time the cloning, expression and characteristics of a GST gene (PtGSTU1) from a pine, Pinus tabulaeformis, which is widely distributed from northern to central China covering cold temperate and drought regions. The PtGSTU1 gene encodes a protein of 228 amino acid residues with a calculated molecular mass of 26.37 kDa. Reverse transcription PCR revealed that PtGSTU1 was expressed in different tissues, both above and below ground, of P. tabulaeformis. The over-expressed recombinant PtGSTU1 showed high activity towards the substrates 1-chloro-2,4-dinitrobenzene (CDNB) and 7-chloro-4-nitrobenzo-2-oxa-1,3-diazole (NBD-Cl). Kinetic analysis with respect to CDNB as substrate revealed a Km of 0.47 mM and Vmax of 169.1 micromol/min per mg of protein. The recombinant PtGSTU1 retained more than 60% of its maximum enzymatic activity from 15 degrees C to 45 degrees C with a broad optimum Tm range of 25 degrees C - 35 degrees C. The enzyme had a maximum activity at approximately pH 8.5 - 9.0. Site-directed mutagenesis revealed that Ser13 in the N-terminal domain is a critical catalytic residue, responsible for stabilisation of the thiolate anion of enzyme-bound glutathione. Based on comparative analyses of its amino acid sequence, phylogeny and predicted three-dimensional structure, the PtGSTU1 should be classified as a tau class GST.
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Affiliation(s)
- Qing-Yin Zeng
- Laboratory of Systematic and Evolutionary Botany, Institute of Botany, Chinese Academy of Sciences, 100093 Beijing, China
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Abstract
The glutathione transferases (glutathione S-transferases, GSTs) are a diverse family of enzymes involved in a wide range of biological processes, many of which involve the conjugation of the tripeptide glutathione to an electrophilic substrate. Relatively little is known about the endogenous substrates of mosquito GSTs, and most studies have focused on their role in insecticide metabolism, because elevated levels of GST activity have been associated with resistance to all the major classes of insecticides. In addition, there is growing interest in the role of this enzyme family in maintaining the redox status of the mosquito cell, particularly in relation to vectorial capacity. Most GSTs are cytosolic dimeric proteins, although a smaller class of microsomal GSTs exists in insects, mammals, and plants. Each GST subunit has a G site that binds glutathione and a substrate-binding site or H site. There are more than 30 GST genes in mosquitoes. Additional diversity is contributed by alternative splicing to produce GSTs with differing substrate specificities. In this review, we first discuss the diversity of insect GST enzymes and their mode of action before focusing on the various functions that have been attributed to specific mosquito GSTs.
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Affiliation(s)
- Hilary Ranson
- Liverpool School of Tropical Medicine, Liverpool, United Kingdom
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Affiliation(s)
- Melinda Neal Martin
- Rutgers University, Center for Biotechnology and the Environment, New Brunswick, NJ 08901-8520, USA
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Kilili KG, Atanassova N, Vardanyan A, Clatot N, Al-Sabarna K, Kanellopoulos PN, Makris AM, Kampranis SC. Differential Roles of Tau Class Glutathione S-Transferases in Oxidative Stress. J Biol Chem 2004; 279:24540-51. [PMID: 15037622 DOI: 10.1074/jbc.m309882200] [Citation(s) in RCA: 80] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022] Open
Abstract
The plant glutathione S-transferase BI-GST has been identified as a potent inhibitor of Bax lethality in yeast, a phenotype associated with oxidative stress and disruption of mitochondrial functions. Screening of a tomato two-hybrid library for BI-GST interacting proteins identified five homologous Tau class GSTs, which readily form heterodimers between them and BI-GST. All six LeGSTUs were found to be able to protect yeast cells from prooxidant-induced cell death. The efficiency of each LeGSTU was prooxidant-specific, indicating a different role for each LeGSTU in the oxidative stress-response mechanism. The prooxidant protective effect of all six proteins was suppressed in the absence of YAP1, a transcription factor that regulates hydroperoxide homeostasis in Saccharomyces cerevisiae, suggesting a role for the LeGSTUs in the context of the YAP1-dependent stress-responsive machinery. The different LeGSTUs exhibited varied substrate specificity and showed activity against oxidative stress by-products, indicating that their prooxidant protective function is likely related to the minimization of oxidative damage. Taken together, these results indicate that Tau class GSTs participate in a broad network of catalytic and regulatory functions involved in the oxidative stress response.
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Affiliation(s)
- Kimiti G Kilili
- Mediterranean Agronomic Institute of Chania, Alsyllion Agrokepiou, Chania 73100, Greece
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Edwards R, Dixon DP. Metabolism of Natural and Xenobiotic Substrates by the Plant Glutathione S-Transferase Superfamily. ECOLOGICAL STUDIES 2004. [DOI: 10.1007/978-3-662-08818-0_2] [Citation(s) in RCA: 18] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
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Ding Y, Ortelli F, Rossiter LC, Hemingway J, Ranson H. The Anopheles gambiae glutathione transferase supergene family: annotation, phylogeny and expression profiles. BMC Genomics 2003; 4:35. [PMID: 12914673 PMCID: PMC194574 DOI: 10.1186/1471-2164-4-35] [Citation(s) in RCA: 185] [Impact Index Per Article: 8.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/11/2003] [Accepted: 08/13/2003] [Indexed: 11/10/2022] Open
Abstract
BACKGROUND Twenty-eight genes putatively encoding cytosolic glutathione transferases have been identified in the Anopheles gambiae genome. We manually annotated these genes and then confirmed the annotation by sequencing of A. gambiae cDNAs. Phylogenetic analysis with the 37 putative GST genes from Drosophila and representative GSTs from other taxa was undertaken to develop a nomenclature for insect GSTs. The epsilon class of insect GSTs has previously been implicated in conferring insecticide resistance in several insect species. We compared the expression level of all members of this GST class in two strains of A. gambiae to determine whether epsilon GST expression is correlated with insecticide resistance status. RESULTS Two A. gambiae GSTs are alternatively spliced resulting in a maximum number of 32 transcripts encoding cytosolic GSTs. We detected cDNAs for 31 of these in adult mosquitoes. There are at least six different classes of GSTs in insects but 20 of the A. gambiae GSTs belong to the two insect specific classes, delta and epsilon. Members of these two GST classes are clustered on chromosome arms 2L and 3R respectively. Two members of the GST supergene family are intronless. Amongst the remainder, there are 13 unique introns positions but within the epsilon and delta class, there is considerable conservation of intron positions. Five of the eight epsilon GSTs are overexpressed in a DDT resistant strain of A. gambiae. CONCLUSIONS The GST supergene family in A. gambiae is extensive and regulation of transcription of these genes is complex. Expression profiling of the epsilon class supports earlier predictions that this class is important in conferring insecticide resistance.
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Affiliation(s)
- Yunchuan Ding
- Vector Research Group, Liverpool School of Tropical Medicine, Liverpool L3 5QA, UK
| | - Federica Ortelli
- Vector Research Group, Liverpool School of Tropical Medicine, Liverpool L3 5QA, UK
- Present Address: Dipartimento di Medicina Sperimentale e Scienze Biochimiche, Università degli Studi di Perugia, Perugia, 06122 Italy
| | - Louise C Rossiter
- Vector Research Group, Liverpool School of Tropical Medicine, Liverpool L3 5QA, UK
- Present Address: Australian Cotton Research Institute, Narrabri NSW 2390 Australia
| | - Janet Hemingway
- Vector Research Group, Liverpool School of Tropical Medicine, Liverpool L3 5QA, UK
| | - Hilary Ranson
- Vector Research Group, Liverpool School of Tropical Medicine, Liverpool L3 5QA, UK
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Ortelli F, Rossiter LC, Vontas J, Ranson H, Hemingway J. Heterologous expression of four glutathione transferase genes genetically linked to a major insecticide-resistance locus from the malaria vector Anopheles gambiae. Biochem J 2003; 373:957-63. [PMID: 12718742 PMCID: PMC1223529 DOI: 10.1042/bj20030169] [Citation(s) in RCA: 141] [Impact Index Per Article: 6.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/27/2003] [Revised: 04/15/2003] [Accepted: 04/28/2003] [Indexed: 11/17/2022]
Abstract
A cluster of eight genes encoding glutathione transferases (GSTs) are located on division 33B of polytene chromosome arm 3R of the African malaria mosquito, Anopheles gambiae. This region of the genome contains a major 1,1,1-trichloro-2,2-bis-( p -chlorophenyl)ethane (DDT)-resistance locus, rtd1. These GSTs belong to the insect-specific Epsilon class and share between 22.6 and 65.2% identity at the amino acid level. Two distinct allelic variants of the Epsilon GST, GSTe1, differing at 12 out of 224 amino acid residues, are present in laboratory and field populations of A. gambiae. To investigate the possible role of these GSTs in conferring resistance to the insecticide DDT, both GSTe1 alleles, plus three additional members of this gene cluster, were expressed in Escherichia coli and the recombinant proteins biochemically characterized. The five putative glutathione transferases encoded catalytically active subunits with variable biochemical properties. For example, the two allelic variants of GSTE1-1 encoded proteins with over 100-fold variation in peroxidase activity, while the three remaining GSTs had no detectable peroxidase activity. Only GSTE2-2 was able to metabolize DDT. Western blots using antibodies raised against these GSTs indicated that the expression of GSTE2-2 is elevated in a DDT-resistant strain of A. gambiae.
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Affiliation(s)
- Federica Ortelli
- Liverpool School of Tropical Medicine, Vector Biology Research Group, Pembroke Place, Liverpool L3 5QA, UK
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28
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Dixon DP, McEwen AG, Lapthorn AJ, Edwards R. Forced evolution of a herbicide detoxifying glutathione transferase. J Biol Chem 2003; 278:23930-5. [PMID: 12692133 DOI: 10.1074/jbc.m303620200] [Citation(s) in RCA: 87] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022] Open
Abstract
Plant Tau class glutathione transferases (GSTUs) detoxify diphenylether herbicides such as fluorodifen, determining their selectivity in crops and weeds. Using reconstructive PCR, a series of mutant GSTUs were generated from in vitro recombination and mutagenesis of the maize sequences ZmGSTU1 and ZmGSTU2 (with the prefix Zm designating Zea mays L.). A screen of 5000 mutant GSTUs identified seven enzymes with enhanced fluorodifen detoxifying activity. The best performing enhanced fluorodifen detoxifying mutant (EFD) had activity 19-fold higher than the parent enzymes, with a single point mutation conferring this enhancement. Further mutagenesis of this residue generated an EFD with a 29-fold higher catalytic efficiency toward fluorodifen as compared with the parents but with unaltered catalysis toward other substrates. When expressed in Arabidopsis thaliana, the optimized EFD, but not the parent enzymes, conferred enhanced tolerance to fluorodifen. Molecular modeling predicts that the serendipitous mutation giving the improvement in detoxification is due to the removal of an unfavorable interaction together with the introduction of a favorable change in conformation of residues 107-119, which contribute to herbicide binding.
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Affiliation(s)
- David P Dixon
- Crop Protection Group, School of Biological and Biomedical Sciences, University of Durham, South Road, Durham DH1 3LE, United Kingdom
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29
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Lederer B, Böger P. Binding and protection of porphyrins by glutathione S-transferases of Zea mays L. BIOCHIMICA ET BIOPHYSICA ACTA 2003; 1621:226-33. [PMID: 12726999 DOI: 10.1016/s0304-4165(03)00073-4] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
Glutathione S-transferases (GSTs) are multi-functional enzymes, known to conjugate xenobiotics and degrade peroxides. Herein, we report on the potential of four Zea mays GST isoforms (Zm GST I-I, Zm GST I-II, Zm GST II-II and Zm GST III-III) to act as binding and protection proteins. These isoforms bind protoporphyrin IX (PPIX), mesoporphyrin, coproporphyrin, uroporphyrin and Mg-protoporpyhrin, but do not form a glutathione conjugate. The binding is non-covalent and inhibits GSTs enzymatic activity, dependent on the type of the porphyrin and GST isoform tested. I(50) values are in the range of 1 to 10 microM for PPIX, the inhibition by mesoporphyrin and Mg-protoporphyrin (Mg-PPIX) is two to five times less. The mode of binding is non-competitive for the hydrophobic substrate and competitive for glutathione. Binding affinities (K(D) values) of the GST isoforms are between 0.3 and 0.8 microM for coproporphyrin and about 2 microM for mesoporphyrin.Zm GST III-III prevents the nonenzymatic autoxidation of protoporphyrinogen to the phytotoxic PPIX. Zm GST II-II can reduce the oxidative degradation of hemin. This points to a specific ligand role of distinct GST isoforms to protect tetrapyrroles in the plant cell.
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Affiliation(s)
- Barbara Lederer
- Lehrstuhl für Physiologie und Biochemie der Pflanzen, Universität Konstanz, D-78457 Constance, Germany
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30
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Fujita M, Hossain MZ. Modulation of pumpkin glutathione S-transferases by aldehydes and related compounds. PLANT & CELL PHYSIOLOGY 2003; 44:481-90. [PMID: 12773634 DOI: 10.1093/pcp/pcg060] [Citation(s) in RCA: 19] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/20/2023]
Abstract
Induction of pumpkin (Cucurbita maxima Duch.) glutathione S-transferase (GST, EC 2.5.1.18) by aldehydes and related compounds was examined. All of the tested compounds induced pumpkin GST to different degrees, and it was found that (1) aldehydes induce GST directly and alcohols induce GST indirectly, and (2) alpha,beta-unsaturated aldehydes are the most effective inducers and their potency is related to the Michael acceptors reaction. The results of Western blot analysis showed that the patterns of induction of CmGSTU1, CmGSTU2 and CmGSTU3 were similar to the patterns of activity with the exception of alpha,beta-unsaturated carbonyl compounds. Among the three compounds, crotonaldehyde caused the highest activity induction (9.2-fold), but Western blot expression was the highest only for CmGSTU3. CmGSTF1 was almost non-responsive to all of the tested stresses. Results of induction studies suggested that efficient pumpkin GST inducers have distinctive chemical features. The in vitro activity of the enzyme was inhibited by ethacryanic acid, trans-2-hexenal, crotonaldehyde, and pentanal. Ethacryanic acid was found to be the most potent inhibitor with an apparent I(50) value of 6.90+/-2.06 micro M, while others were weak to moderate inhibitors. The results presented here indicate that plant GSTs might be involved in the detoxification of physiologically and environmentally hazardous aldehydes/alcohols.
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Affiliation(s)
- Masayuki Fujita
- Department of Plant Sciences, Faculty of Agriculture, Kagawa University, Miki-cho, Kita-gun, Kagawa, 761-0795 Japan.
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Theodoulou FL, Clark IM, He XL, Pallett KE, Cole DJ, Hallahan DL. Co-induction of glutathione-S-transferases and multidrug resistance associated protein by xenobiotics in wheat. PEST MANAGEMENT SCIENCE 2003; 59:202-14. [PMID: 12587874 DOI: 10.1002/ps.576] [Citation(s) in RCA: 36] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/20/2023]
Abstract
Herbicide safeners are known to protect monocotyledonous crops from herbicide injury by accelerating the metabolism of herbicides. We have investigated the effects of the safener cloquintocetmexyl, which protects small-grain cereals against the graminicidal herbicide, clodinafop-propargyl. Subtractive suppression hybridisation was used to identify wheat genes which are up-regulated by treatment not only with cloquintocet-mexyl but also with phenobarbital, which is known to stimulate xenobiotic metabolism in animals and plants. DNA sequences of five glutathione transferases (GSTs) belonging to three different classes and a multidrug resistance associated protein (MRP) homologue were identified in the screen. The chemical inducibility of these clones was confirmed by Northern analysis. The MRP protein was shown to be induced by treatments with cloquintocet-mexyl and phenobarbital and to be localised to the tonoplast. Since clodinafop-propargyl is not known to be metabolised by glutathionylation, the significance of GST induction is interpreted in terms of a generalised response to chemical stress, particularly the generation of active oxygen species. This work establishes herbicide safeners as useful tools for the identification of genes encoding herbicide-metabolising enzymes.
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DeRidder BP, Dixon DP, Beussman DJ, Edwards R, Goldsbrough PB. Induction of glutathione S-transferases in Arabidopsis by herbicide safeners. PLANT PHYSIOLOGY 2002; 130:1497-505. [PMID: 12428014 PMCID: PMC166668 DOI: 10.1104/pp.010066] [Citation(s) in RCA: 97] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/14/2002] [Revised: 07/14/2002] [Accepted: 07/28/2002] [Indexed: 05/18/2023]
Abstract
Herbicide safeners increase herbicide tolerance in cereals but not in dicotyledenous crops. The reason(s) for this difference in safening is unknown. However, safener-induced protection in cereals is associated with increased expression of herbicide detoxifying enzymes, including glutathione S-transferases (GSTs). Treatment of Arabidopsis seedlings growing in liquid medium with various safeners similarly resulted in enhanced GST activities toward a range of xenobiotics with benoxacor, fenclorim, and fluxofenim being the most effective. Safeners also increased the tripeptide glutathione content of Arabidopsis seedlings. However, treatment of Arabidopsis plants with safeners had no effect on the tolerance of seedlings to chloroacetanilide herbicides. Each safener produced a distinct profile of enhanced GST activity toward different substrates suggesting a differential induction of distinct isoenzymes. This was confirmed by analysis of affinity-purified GST subunits by two-dimensional sodium dodecyl sulfate-polyacrylamide gel electrophoresis. AtGSTU19, a tau class GST, was identified as a dominant polypeptide in all samples. When AtGSTU19 was expressed in Escherichia coli, the recombinant enzyme was highly active toward 1-chloro-2,4-dinitrobenzene, as well as chloroacetanilide herbicides. Immunoblot analysis confirmed that AtGSTU19 was induced in response to several safeners. Differential induction of tau GSTs, as well as members of the phi and theta classes by safeners, was demonstrated by RNA-blot analysis. These results indicate that, although Arabidopsis may not be protected from herbicide injury by safeners, at least one component of their detoxification systems is responsive to these compounds.
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Affiliation(s)
- Ben P DeRidder
- Department of Horticulture and Landscape Architecture, Purdue University, West Lafayette, Indiana 47907-1165, USA
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Bianchi MW, Roux C, Vartanian N. Drought regulation of GST8, encoding the Arabidopsis homologue of ParC/Nt107 glutathione transferase/peroxidase. PHYSIOLOGIA PLANTARUM 2002; 116:96-105. [PMID: 12207667 DOI: 10.1034/j.1399-3054.2002.1160112.x] [Citation(s) in RCA: 36] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/18/2023]
Abstract
Glutathione transferases (GST; EC 2.5.1.18) have been involved in many biotic and abiotic interactions of plants with their environment, but very little information is available on their regulation and possible role in drought tolerance. The GST8 gene of Arabidopsis thaliana encodes, as assessed by phylogenetic analysis, the homologue of an extremely conserved subgroup of Tau GSTs. During rapid dehydration of seedlings and progressive drought stress of mature plants, GST8 transcript levels increased following slower kinetics than RNAs for dehydration responsive genes RD29A and B, and strictly paralleled, in a mostly ABA independent manner, expression of oxidative stress marker PRX. GST8 RNA levels were also consistently increased by oxidative stress, high doses of auxin or cytokinin, and to a lesser extent, by wounding. RNA levels of ERD13, a previously described rapid dehydration responsive GST of the Phi class, were not co-regulated with those of GST8. Our results suggest that a drought-associated oxidative stress induces accumulation of GST8, whose function could be to counteract the effect of higher ROS production in stressed plants
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Affiliation(s)
- Michele W Bianchi
- Biologie Cellulaire et Moléculaire de l'Adaptation à la Sécheresse, Faculté des Sciences et Technologie, Université Paris XII-Val de Marne, 61 Avenue General de Gaulle, 94010 Créteil, France Institut des Sciences du Végétal, UPR 40 CNRS, 91198 Gif-sur-Yvette cedex, France
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Kurama EE, Fenille RC, Rosa VE, Rosa DD, Ulian EC. Mining the enzymes involved in the detoxification of reactive oxygen species (ROS) in sugarcane. MOLECULAR PLANT PATHOLOGY 2002; 3:251-259. [PMID: 20569332 DOI: 10.1046/j.1364-3703.2002.00119.x] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/29/2023]
Abstract
Summary Adopting the sequencing of expressed sequence tags (ESTs) of a sugarcane database derived from libraries induced and not induced by pathogens, we identified EST clusters homologous to genes corresponding to enzymes involved in the detoxification of reactive oxygen species. The predicted amino acids of these enzymes are superoxide dismutases (SODs), glutathione-S-transferase (GST), glutathione peroxidase (GPX), and catalases. Three MnSOD mitochondrial precursors and 10 CuZnSOD were identified in sugarcane: the MnSOD mitochondrial precursor is 96% similar to the maize MnSOD mitochondrial precursor and, of the 10 CuZnSOD identified, seven were 98% identical to maize cytosolic CuZnSOD4 and one was 67% identical to putative peroxisomal CuZnSOD from Arabidopsis. Three homologues to class Phi GST were 87-88% identical to GST III from maize. Five GPX homologues were identified: three were homologous to cytosolic GPX from barley, one was 88% identical to phospholipid hydroperoxide glutathione peroxidase (PHGPX) from rice, and the last was 71% identical to GPX from A. thaliana. Three enzymes similar to maize catalase were identified in sugarcane: two were similar to catalase isozyme 3 and catalase chain 3 from maize, which are mitochondrial, and one was similar to catalase isozyme 1 from maize, whose location is peroxisomal subcellular. All enzymes were induced in all sugarcane libraries (flower, seed, root, callus, leaves) and also in the pathogen-induced libraries, except for CuZnSOD whose cDNA was detected in none of the libraries induced by pathogens (Acetobacter diazotroficans and Herbaspirillum rubrisubalbicans). The expression of the enzymes SOD, GST, GPX, and catalases involved in the detoxification was examined using reverse transcriptase-polymerase chain reaction in cDNA from leaves of sugarcane under biotic stress conditions, inoculated with Puccinia melanocephala, the causal agent of sugarcane rust disease.
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Affiliation(s)
- Eiko E Kurama
- Departamento de Produção Vegetal-Setor Defesa Fitossanitária, Faculdade de Ciências Agronômicas, CP 237, 18603-970 Botucatu, SP, Brazil
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Abstract
SUMMARY The soluble glutathione transferases (GSTs, EC 2.5.1.18) are encoded by a large and diverse gene family in plants, which can be divided on the basis of sequence identity into the phi, tau, theta, zeta and lambda classes. The theta and zeta GSTs have counterparts in animals but the other classes are plant-specific and form the focus of this article. The genome of Arabidopsis thaliana contains 48 GST genes, with the tau and phi classes being the most numerous. The GST proteins have evolved by gene duplication to perform a range of functional roles using the tripeptide glutathione (GSH) as a cosubstrate or coenzyme. GSTs are predominantly expressed in the cytosol, where their GSH-dependent catalytic functions include the conjugation and resulting detoxification of herbicides, the reduction of organic hydroperoxides formed during oxidative stress and the isomerization of maleylacetoacetate to fumarylacetoacetate, a key step in the catabolism of tyrosine. GSTs also have non-catalytic roles, binding flavonoid natural products in the cytosol prior to their deposition in the vacuole. Recent studies have also implicated GSTs as components of ultraviolet-inducible cell signaling pathways and as potential regulators of apoptosis. Although sequence diversification has produced GSTs with multiple functions, the structure of these proteins has been highly conserved. The GSTs thus represent an excellent example of how protein families can diversify to fulfill multiple functions while conserving form and structure.
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Affiliation(s)
- David P Dixon
- School of Biological and Biomedical Sciences, University of Durham, Durham DH1 3LE, UK.
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Sheehan D, Meade G, Foley VM, Dowd CA. Structure, function and evolution of glutathione transferases: implications for classification of non-mammalian members of an ancient enzyme superfamily. Biochem J 2001; 360:1-16. [PMID: 11695986 PMCID: PMC1222196 DOI: 10.1042/0264-6021:3600001] [Citation(s) in RCA: 744] [Impact Index Per Article: 32.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/13/2023]
Abstract
The glutathione transferases (GSTs; also known as glutathione S-transferases) are major phase II detoxification enzymes found mainly in the cytosol. In addition to their role in catalysing the conjugation of electrophilic substrates to glutathione (GSH), these enzymes also carry out a range of other functions. They have peroxidase and isomerase activities, they can inhibit the Jun N-terminal kinase (thus protecting cells against H(2)O(2)-induced cell death), and they are able to bind non-catalytically a wide range of endogenous and exogenous ligands. Cytosolic GSTs of mammals have been particularly well characterized, and were originally classified into Alpha, Mu, Pi and Theta classes on the basis of a combination of criteria such as substrate/inhibitor specificity, primary and tertiary structure similarities and immunological identity. Non-mammalian GSTs have been much less well characterized, but have provided a disproportionately large number of three-dimensional structures, thus extending our structure-function knowledge of the superfamily as a whole. Moreover, several novel classes identified in non-mammalian species have been subsequently identified in mammals, sometimes carrying out functions not previously associated with GSTs. These studies have revealed that the GSTs comprise a widespread and highly versatile superfamily which show similarities to non-GST stress-related proteins. Independent classification systems have arisen for groups of organisms such as plants and insects. This review surveys the classification of GSTs in non-mammalian sources, such as bacteria, fungi, plants, insects and helminths, and attempts to relate them to the more mainstream classification system for mammalian enzymes. The implications of this classification with regard to the evolution of GSTs are discussed.
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Affiliation(s)
- D Sheehan
- Department of Biochemistry, University College Cork, Lee Maltings, Prospect Row, Mardyke, Cork, Ireland.
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Kim HG, Park KN, Cho YW, Park EH, Fuchs JA, Lim CJ. Characterization and regulation of glutathione S-transferase gene from Schizosaccharomyces pombe. BIOCHIMICA ET BIOPHYSICA ACTA 2001; 1520:179-85. [PMID: 11513961 DOI: 10.1016/s0167-4781(01)00265-2] [Citation(s) in RCA: 17] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
Abstract
A glutathione S-transferase (GST) gene has been cloned from Schizosaccharomyces pombe for the first time. The nucleotide sequence determined was found to contain 2030 base pairs including an open reading frame of 229 amino acids that would encode a protein of a molecular mass of 27017 Da. The cloned GST gene was expressed and was found to function in S. pombe, Saccharomyces cerevisiae, and Escherichia coli. The plasmid pGT207 encoding the S. pombe GST gene appeared to be able to accelerate the growth of a wild type S. pombe culture. In a culture of S. pombe containing plasmid pGT207, the growth was inhibited less by mercuric chloride than in a culture with vector alone. The 1088 bp region upstream from the GST gene as well as the region encoding the N-terminal 14 amino acids was transferred into the promoterless beta-galactosidase gene of plasmid YEp357R to yield the fusion plasmid pYSH2000. beta-Galactosidase synthesis was induced by cadmium chloride, mercuric chloride, hydrogen peroxide, and menadione. It was also induced by high temperature. These results suggest that the cloned S. pombe GST gene is involved in the oxidative stress response.
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Affiliation(s)
- H G Kim
- Division of Life Sciences, College of Natural Sciences, Kangwon National University, Chuncheon, South Korea
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The Role of Glutathione and Glutathione S-transferases in Plant Reaction and Adaptation to Xenobiotics. PLANT ECOPHYSIOLOGY 2001. [DOI: 10.1007/0-306-47644-4_7] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/02/2022]
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Dixon DP, Cole DJ, Edwards R. Characterisation of a Zeta Class Glutathione Transferase from Arabidopsis thaliana with a Putative Role in Tyrosine Catabolism. Arch Biochem Biophys 2000; 384:407-12. [PMID: 11368331 DOI: 10.1006/abbi.2000.2125] [Citation(s) in RCA: 64] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
A glutathione transferase (GST) similar to zeta GSTs in animals and fungi has been cloned from Arabidopsis thaliana using RT-PCR. The Arabidopsis zeta GST (AtGSTZ1) was expressed in Escherichia coli as his-tagged polypeptides, which associated together to form the 50-kDa AtGSTZ1-1 homodimer. Following purification, AtGSTZ1-1 was assayed for a range of activities and compared with other purified recombinant plant GSTs from the phi, tau, and theta classes. AtGSTZ1-1 differed from the other GSTs in showing no glutathione conjugating activity toward xenobiotics and no glutathione peroxidase activity toward organic hydroperoxides. Uniquely among the plant GSTs, AtGSTZ1-1 showed activity as a maleylacetone isomerase (MAI). This glutathione-dependent reaction is analogous to the cis-trans isomerization of maleylacetoacetate to fumarylacetoacetate, which occurs in the course of tyrosine catabolism to acetoacetate and fumarate. Thus, rather than functioning as a conventional GST, AtGSTZ1-1 appears to be involved in tyrosine degradation. In addition to the MAI activity, the AtGSTZ1-1 also catalyzed the glutathione-dependent dehalogenation of dichloroacetic acid to glyoxylic acid. This latter activity was used to demonstrate the presence of functional AtGSTZ1-1 inplanta.
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Affiliation(s)
- D P Dixon
- Department of Biological Sciences, University of Durham, United Kingdom
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McGonigle B, Keeler SJ, Lau SM, Koeppe MK, O'Keefe DP. A genomics approach to the comprehensive analysis of the glutathione S-transferase gene family in soybean and maize. PLANT PHYSIOLOGY 2000; 124:1105-20. [PMID: 11080288 PMCID: PMC59210 DOI: 10.1104/pp.124.3.1105] [Citation(s) in RCA: 188] [Impact Index Per Article: 7.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/15/2000] [Accepted: 07/25/2000] [Indexed: 05/18/2023]
Abstract
By BLAST searching a large expressed sequence tag database for glutathione S-transferase (GST) sequences we have identified 25 soybean (Glycine max) and 42 maize (Zea mays) clones and obtained accurate full-length GST sequences. These clones probably represent the majority of members of the GST multigene family in these species. Plant GSTs are divided according to sequence similarity into three categories: types I, II, and III. Among these GSTs only the active site serine, as well as another serine and arginine in or near the "G-site" are conserved throughout. Type III GSTs have four conserved sequence patches mapping to distinct structural features. Expression analysis reveals the distribution of GSTs in different tissues and treatments: Maize GSTI is overall the most highly expressed in maize, whereas the previously unknown GmGST 8 is most abundant in soybean. Using DNA microarray analysis we observed increased expression among the type III GSTs after inducer treatment of maize shoots, with different genes responding to different treatments. Protein activity for a subset of GSTs varied widely with seven substrates, and any GST exhibiting greater than marginal activity with chloro-2,4 dinitrobenzene activity also exhibited significant activity with all other substrates, suggesting broad individual enzyme substrate specificity.
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Affiliation(s)
- B McGonigle
- Nutrition and Health, E.I. du Pont de Nemours and Company, Experimental Station, P.O. Box 80328, Wilmington, Delaware 19880-0328, USA
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Edwards R, Dixon DP, Walbot V. Plant glutathione S-transferases: enzymes with multiple functions in sickness and in health. TRENDS IN PLANT SCIENCE 2000; 5:193-8. [PMID: 10785664 DOI: 10.1016/s1360-1385(00)01601-0] [Citation(s) in RCA: 508] [Impact Index Per Article: 21.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/17/2023]
Abstract
Glutathione S-transferases (GSTs) are abundant proteins encoded by a highly divergent, ancient gene family. Soluble GSTs form dimers, each subunit of which contains active sites that bind glutathione and hydrophobic ligands. Plant GSTs attach glutathione to electrophilic xenobiotics, which tags them for vacuolar sequestration. The role of GSTs in metabolism is unclear, although their complex regulation by environmental stimuli implies that they have important protective functions. Recent studies show that GSTs catalyse glutathione-depend-ent isomerizations and the reduction of toxic organic hydroperoxides. GSTs might also have non-catalytic roles as carriers for phytochemicals.
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Affiliation(s)
- R Edwards
- Dept of Biological Sciences, University of Durham, UK
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