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Samsri S, Kortheerakul C, Kageyama H, Waditee-Sirisattha R. Molecular and biochemical characterization of a plant-like iota-class glutathione S-transferase from the halotolerant cyanobacterium Halothece sp. PCC7418. J Appl Microbiol 2024; 135:lxae230. [PMID: 39227165 DOI: 10.1093/jambio/lxae230] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/31/2024] [Revised: 07/31/2024] [Accepted: 09/03/2024] [Indexed: 09/05/2024]
Abstract
AIMS This study identifies a unique glutathione S-transferase (GST) in extremophiles using genome, phylogeny, bioinformatics, functional characterization, and RNA sequencing analysis. METHODS AND RESULTS Five putative GSTs (H0647, H0729, H1478, H3557, and H3594) were identified in Halothece sp. PCC7418. Phylogenetic analysis suggested that H0647, H1478, H0729, H3557, and H3594 are distinct GST classes. Of these, H0729 was classified as an iota-class GST, encoding a high molecular mass GST protein with remarkable features. The protein secondary structure of H0729 revealed the presence of a glutaredoxin (Grx) Cys-Pro-Tyr-Cys (C-P-Y-C) motif that overlaps with the N-terminal domain and harbors a topology similar to the thioredoxin (Trx) fold. Interestingly, recombinant H0729 exhibited a high catalytic efficiency for both glutathione (GSH) and 1-chloro-2, 4-dinitrobenzene (CDNB), with catalytic efficiencies that were 155- and 32-fold higher, respectively, compared to recombinant H3557. Lastly, the Halothece gene expression profiles suggested that antioxidant and phase II detoxification encoding genes are crucial in response to salt stress. CONCLUSION Iota-class GST was identified in cyanobacteria. This GST exhibited a high catalytic efficiency toward xenobiotic substrates. Our findings shed light on a diversified evolution of GST in cyanobacteria and provide functional dynamics of the genes encoding the enzymatic antioxidant and detoxification systems under abiotic stresses.
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Affiliation(s)
- Sasiprapa Samsri
- Department of Microbiology, Faculty of Science, Chulalongkorn University, Phayathai Road, Pathumwan, Bangkok 10330, Thailand
| | - Chananwat Kortheerakul
- Department of Microbiology, Faculty of Science, Chulalongkorn University, Phayathai Road, Pathumwan, Bangkok 10330, Thailand
| | - Hakuto Kageyama
- Department of Chemistry, Faculty of Science and Technology, Meijo University, 1-501 Shiogamaguchi, Tenpaku-ku, Nagoya, Aichi 468-8502, Japan
- Graduate School of Environmental and Human Sciences, Meijo University, 1-501 Shiogamaguchi, Tenpaku-ku, Nagoya, Aichi 468-8502, Japan
| | - Rungaroon Waditee-Sirisattha
- Department of Microbiology, Faculty of Science, Chulalongkorn University, Phayathai Road, Pathumwan, Bangkok 10330, Thailand
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Sánchez-Castro I, Viver T, Martínez-Rodríguez P, Bustos-Caparros E, Ruiz-Fresneda MÁ, Mena-Sanabria MT, Jiménez-García I, Bosch-Estévez G, Descostes M, Merroun ML. Acidovorax bellezanensis sp. nov., a novel bacterium from uranium mill tailings repository sites with selenium bioremediation capabilities. Heliyon 2024; 10:e33171. [PMID: 39005906 PMCID: PMC11239578 DOI: 10.1016/j.heliyon.2024.e33171] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/02/2023] [Revised: 06/10/2024] [Accepted: 06/14/2024] [Indexed: 07/16/2024] Open
Abstract
A Gram-stain-negative bacterial strain designated Be4T, belonging to the genus Acidovorax, was isolated from mining porewaters sampled in uranium mill tailings repository sites, located in Bellezane, near Bessines-sur-Gartempe (Limousin, France). Cells were facultative anaerobic, rod-shaped, non-endospore-forming and motile with flagella. The mean cell size was 1.25-1.31 μm long and 0.70-0.73 μm wide. Colonies were light yellow, opaque, circular, convex with smooth margins, and 1-2 mm in diameter. Growth occurs at 4-37 °C and between pH 5.5-9.0. It differed from its phylogenetically related strains by phenotypic and physiological characteristics such as growth at 4 °C, presence of acid phosphatase, naphthol-AS-BI-phosphohydrolase and β-glucosidase enzymatic activities, and fermentation of l-xylose and esculin. The major fatty acids were C16:0, C16:1 ω7c/C16:1 ω6c, C17:0 cyclo and C18:1 ω7c. Phylogenetic analysis based on 16S rRNA and 938 core genes, confirmed its placement within the genus Acidovorax as a novel species. Strain Be4T showed highest 16S rRNA sequence similarity to Acidovorax antarcticus (98.2 %), Acidovorax radicis (97.9 %), Acidovorax temperans (97.8 %) and Acidovorax facilis (97.7 %). The genome of strain Be4T is 5,041,667 bp size with a DNA G + C content of 65.15 %. By automatic annotation numerous sequences involved in the interaction with metals/metalloids including some genes related to Se uptake and selenite resistance were detected in its genome. The average nucleotide identity (ANI) values calculated from whole genome sequences between strain Be4T and the most closely related strains A. radicis and A. facilis were below the threshold value of 95 %. Thus, the data from the phylogenetic, physiological, biochemical, and genomic analyses clearly indicates that strain Be4T represents a novel species with the suggested name Acidovorax bellezanensis sp. nov. The type strain is Acidovorax bellezanensis Be4T (=DSM116209T = CECT30865T). This novel species, due to its unique isolation source, genomic analysis, and preliminary laboratory tests where it was able to reduce toxic Se(IV) to less harmful Se(0) in the form of nanoparticles, holds great potential for further investigation in bioremediation, particularly concerning Se.
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Affiliation(s)
- Iván Sánchez-Castro
- Departamento de Microbiología, Campus de Fuentenueva, Universidad de Granada, 18071, Granada, Spain
| | - Tomeu Viver
- Marine Microbiology Group, Department of Animal and Microbial Biodiversity, Mediterranean Institute for Advanced Studies (IMEDEA, CSIC-UIB), Esporles, Spain
- Department of Molecular Ecology, Max Planck Institute for Marine Microbiology, Bremen, Germany
| | - Pablo Martínez-Rodríguez
- Departamento de Microbiología, Campus de Fuentenueva, Universidad de Granada, 18071, Granada, Spain
| | - Esteban Bustos-Caparros
- Marine Microbiology Group, Department of Animal and Microbial Biodiversity, Mediterranean Institute for Advanced Studies (IMEDEA, CSIC-UIB), Esporles, Spain
| | | | | | - Ignacio Jiménez-García
- Departamento de Microbiología, Campus de Fuentenueva, Universidad de Granada, 18071, Granada, Spain
| | - Germán Bosch-Estévez
- Departamento de Microbiología, Campus de Fuentenueva, Universidad de Granada, 18071, Granada, Spain
| | - Michael Descostes
- Environmental R&D Department, Orano Mining, Chatillon, 92320, France
- Centre de Géosciences, MINES Paris, PSL University, 35 rue St Honoré, 77300, Fontainebleau, France
| | - Mohamed Larbi Merroun
- Departamento de Microbiología, Campus de Fuentenueva, Universidad de Granada, 18071, Granada, Spain
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Platis M, Vlachakis D, Foudah AI, Muharram MM, Alqarni MH, Papageorgiou AC, Labrou NE. The Interaction of Schistosoma Japonicum Glutathione Transferase with Cibacron Blue 3GA and its Fragments. Med Chem 2021; 17:332-343. [PMID: 32242785 DOI: 10.2174/1573406416666200403074742] [Citation(s) in RCA: 9] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/11/2019] [Revised: 02/22/2020] [Accepted: 03/04/2020] [Indexed: 11/22/2022]
Abstract
BACKGROUND The 26kDa glutathione transferase (GST, EC 2.5.1.18) from Schistosoma japonicum (SjGST) is recognized as the major detoxification enzyme of S. japonicum, a pathogenic helminth causing schistosomiasis. OBJECTIVE In the present study, the interaction of the chlorotriazine dye Cibacron blue 3GA (CB3GA) and its structural analogues with SjGST was investigated. The work aimed to shed light on the non-substrate ligand-binding properties of the enzyme. METHODS Kinetic inhibition analysis, affinity labelling experiments and molecular modelling studies were employed. RESULTS The results showed that CB3GA is a potent inhibitor (IC50 0.057 ± 0.003 μM) towards SjGST. The enzyme was specifically and irreversibly inactivated by the dichlorotriazine-analogue of CB3GA (IC50 0.190 ± 0.024 μM), following a biphasic pseudo-first-order saturation kinetics with approximately 1 mol of inhibitor per mol of the dimeric enzyme being incorporated. All other monochlorotriazine analogues behave as reversible inhibitors with lower inhibition potency (IC50 5.2-82.3 μM). Kinetic inhibition studies, together with molecular modelling and molecular dynamics simulations, established that the CB3GA binding site overlaps both the G- and H-sites. Both hydrophobic/ polar interactions, as well as steric effects, have decisive roles in determining the inhibitory strength of CB3GA and its analogues. CONCLUSION The results of the present study might be useful in future drug design and development efforts towards SjGST.
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Affiliation(s)
- Michalis Platis
- Laboratory of Enzyme Technology, Department of Biotechnology, School of Applied Biology and Biotechnology, Agricultural University of Athens, 75 Iera Odos Street, GR-11855-Athens, Greece
| | - Dimitrios Vlachakis
- Laboratory of Genetics, Department of Biotechnology, School of Applied Biology and Biotechnology, Agricultural University of Athens, 75 Iera Odos Street, GR-11855-Athens, Greece
| | - Ahmed I Foudah
- Department of Pharmacognosy, College of Pharmacy, Prince Sattam Bin Abdulaziz University, 11942 Al Kharj, Saudi Arabia
| | - Magdy M Muharram
- Department of Pharmaceutics, College of Pharmacy, Prince Sattam Bin Abdulaziz University, 11942, Alkharj, Saudi Arabia
| | - Mohamed H Alqarni
- Department of Pharmacognosy, College of Pharmacy, Prince Sattam Bin Abdulaziz University, 11942, Alkharj, Saudi Arabia
| | | | - Nikolaos E Labrou
- Laboratory of Enzyme Technology, Department of Biotechnology, School of Applied Biology and Biotechnology, Agricultural University of Athens, 75 Iera Odos Street, GR-11855-Athens, Greece
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Georgakis N, Poudel N, Papageorgiou AC, Labrou NE. Comparative structural and functional analysis of phi class glutathione transferases involved in multiple-herbicide resistance of grass weeds and crops. PLANT PHYSIOLOGY AND BIOCHEMISTRY : PPB 2020; 149:266-276. [PMID: 32088578 DOI: 10.1016/j.plaphy.2020.02.012] [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: 12/02/2019] [Revised: 01/22/2020] [Accepted: 02/11/2020] [Indexed: 06/10/2023]
Abstract
Multiple-herbicide resistant (MHR) weeds are a global problem and a looming threat to weed control in crops. MHR weeds express a specific phi class glutathione transferase (MHR-GSTF) which seems to contribute to herbicide resistance. The present work aims to investigate the structure and catalytic properties of the MHR-GSTFs from different grass weeds and crops (Alopecurus myosuroides, Lolium rigidum, Hordeum vulgare, Triticum aestivum). Recombinant MHR-GSTFs were expressed in E. coli and purified by affinity chromatography. Kinetic analysis of substrate specificity using a range of thiol substrates and xenobiotic compounds suggested that all enzymes display a broad range of specificity and are capable of detoxifying major stress-induced toxic products. Notably, all tested enzymes exhibited high activity towards organic hydroperoxides. The crystal structure of MHR-GSTF from Alopecurus myosuroides (AmGSTF) was determined by molecular replacement at 1.33 Å resolution. The enzyme was resolved with bound glutathione sulfenic acid (GSOH) at the G-site and succinic acid at the H-site. The enzyme shows conserved structural features compared to other Phi class GSTs. However, some differences were observed at the C-terminal helix H9 that may affect substrate specificity. The structural and functional features of AmGSTF were compared with those of the homologue crop enzymes (HvGSTF and TaGSTF) and discussed in light of their contribution to the MHR mechanism.
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Affiliation(s)
- Nikolaos Georgakis
- Laboratory of Enzyme Technology, Department of Biotechnology, School of Applied Biology and Biotechnology, Agricultural University of Athens, 75 Iera Odos Street, GR-11855, Athens, Greece
| | - Nirmal Poudel
- Turku Bioscience Centre, University of Turku and Åbo Akademi University, Turku, 20521, Finland
| | | | - Nikolaos E Labrou
- Laboratory of Enzyme Technology, Department of Biotechnology, School of Applied Biology and Biotechnology, Agricultural University of Athens, 75 Iera Odos Street, GR-11855, Athens, Greece.
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