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Fromsejer R, Mikkelsen KV, Hemmingsen L. Dynamics of nuclear recoil: QM-BOMD simulations of model systems following β-decay. Phys Chem Chem Phys 2021; 23:25689-25698. [PMID: 34755727 DOI: 10.1039/d1cp02112e] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
Abstract
The kinetic recoil energy received by the daughter nucleus in a nuclear decay is often large enough to affect the structure around the nucleus in chemical systems. The coinciding element change which typically occurs in a nuclear decay may additionally incur a structural reorganization. The effects of these phenomena on chemical systems where radio-isotopes are used are often little-known or neglected because the dynamics of nuclear decay is difficult to observe experimentally. In this work, QM-MD simulations are used to investigate local fs to ps dynamics following the β-decay of 111Ag to 111Cd in systems modelled on the metal-sensing CueR protein. An adiabatic approximation is applied, assuming that the electronic structure relaxes rapidly after the decay. PM7-MD simulations of recoil dynamics of the model systems show significant structural changes and bonding interactions that depend on the magnitude and direction of the recoil. We find that, in general, the kinetic recoil energy is rapidly distributed (<5 ps) uniformly throughout the systems in the studied scenarios.
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Affiliation(s)
- Rasmus Fromsejer
- Department of Chemistry, University of Copenhagen, Universitetsparken 5, 2100 København Ø, Denmark.
| | - Kurt V Mikkelsen
- Department of Chemistry, University of Copenhagen, Universitetsparken 5, 2100 København Ø, Denmark.
| | - Lars Hemmingsen
- Department of Chemistry, University of Copenhagen, Universitetsparken 5, 2100 København Ø, Denmark.
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2
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Xue JH, Xiao KP, Wang YS, Liu L, Li JQ, Li M, Qu YN, Xiao XL. Aggregation-induced photoluminescence enhancement of protamine-templated gold nanoclusters for 1-hydroxypyrene detection using 9-hydroxyphenanthrene as a sensitizer. Colloids Surf B Biointerfaces 2020; 189:110873. [DOI: 10.1016/j.colsurfb.2020.110873] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/04/2019] [Revised: 02/11/2020] [Accepted: 02/12/2020] [Indexed: 12/19/2022]
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3
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Torreggiani A, Tinti A, Jurasekova Z, Capdevila M, Saracino M, Di Foggia M. Structural Lesions of Proteins Connected to Lipid Membrane Damages Caused by Radical Stress: Assessment by Biomimetic Systems and Raman Spectroscopy. Biomolecules 2019; 9:E794. [PMID: 31783702 PMCID: PMC6995617 DOI: 10.3390/biom9120794] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/31/2019] [Revised: 11/25/2019] [Accepted: 11/27/2019] [Indexed: 12/16/2022] Open
Abstract
Model systems constituted by proteins and unsaturated lipid vesicles were used to gain more insight into the effects of the propagation of an initial radical damage on protein to the lipid compartment. The latter is based on liposome technology and allows measuring the trans unsaturated fatty acid content as a result of free radical stress on proteins. Two kinds of sulfur-containing proteins were chosen to connect their chemical reactivity with membrane lipid transformation, serum albumins and metallothioneins. Biomimetic systems based on radiation chemistry were used to mimic the protein exposure to different kinds of free radical stress and Raman spectroscopy to shed light on protein structural changes caused by the free radical attack. Among the amino acid residues, Cys is one of the most sensitive residues towards the attack of free radicals, thus suggesting that metal-Cys clusters are good interceptors of reactive species in metallothioneins, together with disulfides moieties in serum albumins. Met is another important site of the attack, in particular under reductive conditions. Tyr and Phe are sensitive to radical stress too, leading to electron transfer reactions or radical-induced modifications of their structures. Finally, modifications in protein folding take place depending on reactive species attacking the protein.
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Affiliation(s)
| | - Anna Tinti
- Dipartimento di Scienze Biomediche e Neuromotorie, Università di Bologna, via Belmeloro 8/2, 40126 Bologna, Italy; (A.T.); (M.D.F.)
| | - Zuzana Jurasekova
- Department of Biophysics, Faculty of Science, P.J. Safarik University, Jesenna 5, 04001 Kosice, Slovakia;
- Center for Interdisciplinary Biosciences, Technology and Innovation Park, P. J. Safarik University, Jesenna 5, 04001 Kosice, Slovakia
| | - Mercè Capdevila
- Departament de Quimica, Facultat de ciencies, Universitat Autònoma de Barcelona, 08193 Bellaterra, Catalonia, Spain;
| | - Michela Saracino
- Istituto I.S.O.F. (C.N.R.), via P. Gobetti 101, 40129 Bologna, Italy;
| | - Michele Di Foggia
- Dipartimento di Scienze Biomediche e Neuromotorie, Università di Bologna, via Belmeloro 8/2, 40126 Bologna, Italy; (A.T.); (M.D.F.)
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Gao G, Chen J, Chen P, Chen K, Abubakar AS, Yu C, Zhu A. Analysis of BnMTL, a novel metallothionein-like protein in the bast fiber crop Ramie (Boehmeria nivea). FEBS Open Bio 2019; 9:1632-1639. [PMID: 31353835 PMCID: PMC6722885 DOI: 10.1002/2211-5463.12705] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/06/2019] [Revised: 07/18/2019] [Accepted: 07/26/2019] [Indexed: 12/02/2022] Open
Abstract
Ramie (Boehmeria nivea) is a perennial herb that is highly tolerant of heavy metals. In the present study, we cloned a novel metallothionein-like gene from ramie; this gene, termed BnMTL, encodes a putative 46 amino acid protein with a molecular mass of 4.38 kDa. Analysis using quantitative RT-PCR revealed that cadmium (Cd2+ ) treatment results in elevated expression of BnMTL in the roots. We heterologously overexpressed BnMTL in Escherichia coli cells to examine its binding to Cd2+ and its possible role in homeostasis. Recombinant E. coli cells expressing BnMTL exhibited a high tolerance of Cd2+ stress up to a concentration of 1 mm, and the observed accumulation of Cd2+ was almost eight-fold higher than the control. These results demonstrate that BnMTL (i) is highly expressed in the root following exposure to Cd2+ and (ii) encodes a typical metallothionein-like protein with high cadmium-binding activity.
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Affiliation(s)
- Gang Gao
- Institute of Bast Fiber CropsChinese Academy of Agricultural SciencesChangshaChina
| | - Jikang Chen
- Institute of Bast Fiber CropsChinese Academy of Agricultural SciencesChangshaChina
| | - Ping Chen
- Institute of Bast Fiber CropsChinese Academy of Agricultural SciencesChangshaChina
| | - Kunmei Chen
- Institute of Bast Fiber CropsChinese Academy of Agricultural SciencesChangshaChina
| | - Aminu Shehu Abubakar
- Institute of Bast Fiber CropsChinese Academy of Agricultural SciencesChangshaChina
| | - Chunming Yu
- Institute of Bast Fiber CropsChinese Academy of Agricultural SciencesChangshaChina
| | - Aiguo Zhu
- Institute of Bast Fiber CropsChinese Academy of Agricultural SciencesChangshaChina
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Mervinetsky E, Alshanski I, Buchwald J, Dianat A, Lončarić I, Lazić P, Crljen Ž, Gutierrez R, Cuniberti G, Hurevich M, Yitzchaik S. Direct Assembly and Metal-Ion Binding Properties of Oxytocin Monolayer on Gold Surfaces. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2019; 35:11114-11122. [PMID: 31361147 DOI: 10.1021/acs.langmuir.9b01830] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/10/2023]
Abstract
Peptides are very common recognition entities that are usually attached to surfaces using multistep processes. These processes require modification of the native peptides and of the substrates. Using functional groups in native peptides for their assembly on surfaces without affecting their biological activity can facilitate the preparation of biosensors. Herein, we present a simple single-step formation of native oxytocin monolayer on gold surface. These surfaces were characterized by atomic force spectroscopy, spectroscopic ellipsometry, and X-ray photoelectron spectroscopy. We took advantage of the native disulfide bridge of the oxytocin for anchoring the peptide to the Au surface, while preserving the metal-ion binding properties. Self-assembled oxytocin monolayer was used by electrochemical impedance spectroscopy for metal-ion sensing leading to subnanomolar sensitivities for zinc or copper ions.
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Affiliation(s)
| | | | - Jörg Buchwald
- Institute for Materials Science and Max Bergmann Center of Biomaterials , Hallwachsstraße 3 , 01062 Dresden , Germany
| | - Arezoo Dianat
- Institute for Materials Science and Max Bergmann Center of Biomaterials , Hallwachsstraße 3 , 01062 Dresden , Germany
| | - Ivor Lončarić
- Ruđer Bošković Institute , Bijenička cesta 54 , 10000 Zagreb , Croatia
| | - Predrag Lazić
- Ruđer Bošković Institute , Bijenička cesta 54 , 10000 Zagreb , Croatia
| | - Željko Crljen
- Ruđer Bošković Institute , Bijenička cesta 54 , 10000 Zagreb , Croatia
| | - Rafael Gutierrez
- Institute for Materials Science and Max Bergmann Center of Biomaterials , Hallwachsstraße 3 , 01062 Dresden , Germany
| | - Gianaurelio Cuniberti
- Institute for Materials Science and Max Bergmann Center of Biomaterials , Hallwachsstraße 3 , 01062 Dresden , Germany
- Dresden Center for Computational Materials Science , TU Dresden , 01062 Dresden , Germany
- Center for Advancing Electronics Dresden , TU Dresden , 01062 Dresden , Germany
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Tomàs Giner M, Jiménez-Martí E, Bofill Arasa R, Tinti A, Di Foggia M, Chatgilialoglu C, Torreggiani A. Analysis of the soybean metallothionein system under free radical stress: protein modification connected to lipid membrane damage. Metallomics 2018; 10:1792-1804. [PMID: 30398507 DOI: 10.1039/c8mt00164b] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/25/2022]
Abstract
Metallothioneins are small Cys-rich peptides capable of coordinating metal ions, and proposed to be involved in radical stress. The four Zn(ii)-GmMT complexes of soybean (Glycine max) were recombinantly synthesised and exposed to oxidative (HO˙) and reductive (H˙ atoms and eaq-) stress conditions. Gamma-irradiation was used to simulate the endogenous formation of the reactive species in both aqueous solutions and unsaturated lipid vesicle suspensions, a biomimetic model that showed that tandem protein/lipid damage occurs, in particular under reductive radical stress. This is due to the formation of diffusible sulphur-centred radicals, which migrate from the aqueous phase to the lipid bilayer and are thus able to transform the cis double bond of the oleate moiety into the trans isomer. Among the amino acid residues present in GmMTs, Cys is one of the most sensitive residues towards the attack of free radicals, thus suggesting metal-clusters to be good interceptors of free radicals. Also Met, Tyr and Phe residues are sensitive amino acid sites of attack under both oxidative and reductive conditions. The modification of the Zn(ii)-GmMT complexes, in particular isoform 2, was monitored by Raman spectroscopy and mass spectrometry. Free radical stress on the Zn(ii)-GmMT complexes is able to induce significant structural changes such as partial deconstruction and/or rearrangement of the metal clusters, but not the complete demetallation of the proteins nor breaking of the backbone, thus confirming their capability to act as protectors under free radical stress conditions.
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Affiliation(s)
- Mireia Tomàs Giner
- Dep. Genètica, Facultat de Biologia, Univ. Barcelona, Av. Diagonal 645, 08028 Barcelona, Catalonia, Spain.
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Pan Y, Pan Y, Zhai J, Xiong Y, Li J, Du X, Su C, Zhang X. Cucumber Metallothionein-Like 2 (CsMTL2) Exhibits Metal-Binding Properties. Genes (Basel) 2016; 7:E106. [PMID: 27916887 PMCID: PMC5192482 DOI: 10.3390/genes7120106] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/21/2016] [Revised: 10/24/2016] [Accepted: 11/14/2016] [Indexed: 01/25/2023] Open
Abstract
We identified a novel member of the metallothionein (MT) family, Cucumis sativus metallothionein-like 2 (CsMTL2), by screening a young cucumber fruit complementary DNA (cDNA) library. The CsMTL2 encodes a putative 77-amino acid Class II MT protein that contains two cysteine (Cys)-rich domains separated by a Cys-free spacer region. We found that CsMTL2 expression was regulated by metal stress and was specifically induced by Cd2+ treatment. We investigated the metal-binding characteristics of CsMTL2 and its possible role in the homeostasis and/or detoxification of metals by heterologous overexpression in Escherichia coli cells. Furthermore, we produced a deletion mutant form of the protein, CsMTL2m, that contained the two Cys-rich clusters but lacked the spacer region, in E. coli. We compared the metal-binding properties of CsMTL2 with those of CsMTL2m, the β domain of human metallothionein-like protein 1 (HsMTXb), and phytochelatin-like (PCL) heterologously expressed in E. coli using metal-binding assays. We found that E. coli cells expressing CsMTL2 accumulated the highest levels of Zn2+ and Cd2+ of the four transformed cell types, with levels being significantly higher than those of control cells containing empty vector. E. coli cells expressing CsMTL2 had a higher tolerance for cadmium than for zinc ions. These findings show that CsMTL2 improves metal tolerance when heterologously expressed in E. coli. Future studies should examine whether CsMTL2 improves metal tolerance in planta.
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Affiliation(s)
- Yu Pan
- Key Laboratory of Horticulture Science for Southern Mountainous Regions, Ministry of Education, College of Horticulture and Landscape Architecture, Southwest University, No. 2 Tiansheng Road, Beibei, Chongqing 400715, China.
| | - Yanglu Pan
- Key Laboratory of Horticulture Science for Southern Mountainous Regions, Ministry of Education, College of Horticulture and Landscape Architecture, Southwest University, No. 2 Tiansheng Road, Beibei, Chongqing 400715, China.
| | - Junpeng Zhai
- Key Laboratory of Horticulture Science for Southern Mountainous Regions, Ministry of Education, College of Horticulture and Landscape Architecture, Southwest University, No. 2 Tiansheng Road, Beibei, Chongqing 400715, China.
- Qijiang District Bureau of Forestry, Chongqing 401420, China.
| | - Yan Xiong
- Institute of Vegetables and Flowers, Chongqing Academy of Agricultural Sciences, Chongqing 401329, China.
| | - Jinhua Li
- Key Laboratory of Horticulture Science for Southern Mountainous Regions, Ministry of Education, College of Horticulture and Landscape Architecture, Southwest University, No. 2 Tiansheng Road, Beibei, Chongqing 400715, China.
| | - Xiaobing Du
- Key Laboratory of Horticulture Science for Southern Mountainous Regions, Ministry of Education, College of Horticulture and Landscape Architecture, Southwest University, No. 2 Tiansheng Road, Beibei, Chongqing 400715, China.
| | - Chenggang Su
- Key Laboratory of Horticulture Science for Southern Mountainous Regions, Ministry of Education, College of Horticulture and Landscape Architecture, Southwest University, No. 2 Tiansheng Road, Beibei, Chongqing 400715, China.
| | - Xingguo Zhang
- Key Laboratory of Horticulture Science for Southern Mountainous Regions, Ministry of Education, College of Horticulture and Landscape Architecture, Southwest University, No. 2 Tiansheng Road, Beibei, Chongqing 400715, China.
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Tomas M, Tinti A, Bofill R, Capdevila M, Atrian S, Torreggiani A. Comparative Raman study of four plant metallothionein isoforms: Insights into their Zn(II) clusters and protein conformations. J Inorg Biochem 2016; 156:55-63. [DOI: 10.1016/j.jinorgbio.2015.12.027] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/24/2015] [Revised: 12/17/2015] [Accepted: 12/28/2015] [Indexed: 02/06/2023]
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Moulis JM, Bourguignon J, Catty P. Cadmium. BINDING, TRANSPORT AND STORAGE OF METAL IONS IN BIOLOGICAL CELLS 2014. [DOI: 10.1039/9781849739979-00695] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/29/2023]
Abstract
Cadmium is not an essential element for life. It is geologically marginal but anthropogenic activities have contributed significantly to its dispersion in the environment and to cadmium exposure of living species. The natural speciation of the divalent cation Cd2+ is dominated by its high propensity to bind to sulfur ligands, but Cd2+ may also occupy sites providing imidazole and carboxylate ligands. It binds to cell walls by passive adsorption (bio-sorption) and it may interact with surface receptors. Cellular uptake can occur by ion mimicry through a variety of transporters of essential divalent cations, but not always. Once inside cells, Cd2+ preferentially binds to thiol-rich molecules. It can accumulate in intracellular vesicles. It may also be transported over long distances within multicellular organisms and be trapped in locations devoid of efficient excretion systems. These locations include the renal cortex of animals and the leaves of hyper-accumulating plants. No specific regulatory mechanism monitors Cd2+ cellular concentrations. Thiol recruitment by cadmium is a major interference mechanism with many signalling pathways that rely on thiolate-disulfide equilibria and other redox-related processes. Cadmium thus compromises the antioxidant intracellular response that relies heavily on molecules with reactive thiolates. These biochemical features dominate cadmium toxicity, which is complex because of the diversity of the biological targets and the consequent pleiotropic effects. This chapter compares the cadmium-handling systems known throughout phylogeny and highlights the basic principles underlying the impact of cadmium in biology.
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Affiliation(s)
- Jean-Marc Moulis
- CEA, Institut de Recherches en Technologies et Sciences pour le Vivant, Laboratoire Chimie et Biologie des Métaux 17 rue des Martyrs F-38054 Grenoble France
- CNRS UMR5249 F-38054 Grenoble France
- Université Joseph Fourier-Grenoble I UMR5249 F-38041 Grenoble France
| | - Jacques Bourguignon
- CEA, Institut de Recherches en Technologies et Sciences pour le Vivant, Laboratoire Physiologie Cellulaire et Végétale F-38054 Grenoble France
- CNRS UMR5168 F-38054 Grenoble France
- Université Joseph Fourier-Grenoble I UMR5168 F-38041 Grenoble France
- INRA USC1359 F-38054 Grenoble France
| | - Patrice Catty
- CEA, Institut de Recherches en Technologies et Sciences pour le Vivant, Laboratoire Chimie et Biologie des Métaux 17 rue des Martyrs F-38054 Grenoble France
- CNRS UMR5249 F-38054 Grenoble France
- Université Joseph Fourier-Grenoble I UMR5249 F-38041 Grenoble France
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Zhang M, Takano T, Liu S, Zhang X. Abiotic stress response in yeast and metal-binding ability of a type 2 metallothionein-like protein (PutMT2) from Puccinellia tenuiflora. Mol Biol Rep 2014; 41:5839-49. [PMID: 24973879 DOI: 10.1007/s11033-014-3458-1] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/22/2013] [Accepted: 06/12/2014] [Indexed: 10/25/2022]
Abstract
Metallothioneins are low-molecular weight and cysteine-rich metal-binding proteins that play predominant cellular roles in the scavenging of reactive oxygen species and in mediating metal metabolism. To evaluate the role of a type-2 metallothionein-like gene from Puccinellia tenuiflora (PutMT2), the gene was over-expressed in yeast, and growth was assessed under a variety of abiotic stress conditions including peroxide (H2O2), salinity (NaCl and NaHCO3), and metal stress. PutMT2 overexpression in yeast improved the tolerance of cells to H2O2, NaCl, NaHCO3, Zn(2+), Fe(2+), Fe(3+), Cd(2+), Cr(6+), and Ag(+), but increased the sensitivity of cells to Mn(2+), Co(2+), Cu(2+), and Ni(2+) compared with control cells. PutMT2 was then expressed in Escherichia coli BL21as a glutathione S-transferase (GST) fusion protein (GST-PutMT2), and the metal-binding ability of GST-PutMT2 was analyzed and compared with GST alone using inductively coupled plasma atomic emission spectroscopy. Results showed that PutMT2 could bind to Cr, Cd, Co, Ag, Ba, Pb, Mn, Zn, Fe, Cu, P, Al, and Mg, but not Ni and As. There was no evidence to suggest that PutMT2 exhibited a specific or selective binding tendency to any individual metal ion. PutMT2 protein bound to Zn, Na, and Cu in vivo, perhaps with the highest affinity for Cu. Taken together, our results suggest that PutMT2 protein could play an important role in improving metal tolerance by metal binding in yeast. However, additional studies are required to confirm these results and to clarify the function of PutMT2 in transgenic plants.
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Affiliation(s)
- Min Zhang
- Key Laboratory of Saline-alkali Vegetation Ecology Restoration in Oil Field (SAVER), Ministry of Education, Alkali Soil Natural Environmental Science Centre (ASNESC), Northeast Forestry University, Harbin, 150040, China
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Mudalkar S, Golla R, Sengupta D, Ghatty S, Reddy AR. Molecular cloning and characterisation of metallothionein type 2a gene from Jatropha curcas L., a promising biofuel plant. Mol Biol Rep 2013; 41:113-24. [DOI: 10.1007/s11033-013-2843-5] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/07/2012] [Accepted: 10/26/2013] [Indexed: 11/28/2022]
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Heterologous expression and metal-binding characterization of a type 1 metallothionein isoform (OsMTI-1b) from rice (Oryza sativa). Protein J 2013; 32:131-7. [PMID: 23385446 DOI: 10.1007/s10930-013-9469-2] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
Abstract
Metallothioneins (MTs) are ubiquitous, low molecular mass and cysteine-rich proteins that play important roles in maintaining intracellular metal homeostasis, eliminating metal toxification and protecting the cells against oxidative damages. MTs are able to bind metal ions through the thiol groups of their cysteine residues. Plants have several MT isoforms which are classified into four types based on the arrangement of cysteine residues. In the present study, a rice (Oryza sativa) gene encoding type 1 MT isoform, OsMTI-1b, was inserted in vector pET41a and overexpressed in Escherichia coli as carboxy-terminal extensions of glutathione-S-transferase (GST). The recombinant protein GST-OsMTI-1b was purified using affinity chromatography and its ability to bind with Ni(2+), Cd(2+), Zn(2+) and Cu(2+) ions was analyzed. The results demonstrated that this isoform has ability to bind Ni(2+), Cd(2+) and Zn(2+) ions in vitro, whereas it has no substantial ability to bind Cu(2+) ions. From competitive reaction with 5,5'-dithiobis(2-nitrobenzoic acid), DTNB, the affinity of metal ions for recombinant form of GST-OsMTI-1b was as follows: Ni(2+)/Cd(2+) > Zn(2+) > Cu(2+).
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Non-enzymatic modifications in metallothioneins connected to lipid membrane damages: structural and biomimetic studies under reductive radical stress. J Proteomics 2013; 92:204-15. [PMID: 23542714 DOI: 10.1016/j.jprot.2013.02.005] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/03/2013] [Revised: 02/08/2013] [Accepted: 02/10/2013] [Indexed: 11/20/2022]
Abstract
UNLABELLED Metallothioneins (MTs) are small cysteine-rich proteins with the ability to coordinate heavy metal atoms through metal-thiolate bonds, which are widely distributed among the animal and plant kingdoms. Multifunctional roles for MTs have been proposed, including their ability to scavenger various radicals and reactive oxygen species. In the present article we summarize available information of four MT polypeptides from different organisms, forming metal complexes with Zn(II), Cd(II) or Cu (I) ions. Non-enzymatic modifications of MTs under ionizing radiations and their consequences on the lipidic membrane compartment were studied by Raman spectroscopy and a biomimetic model, respectively. The latter is based on liposome technology and allows to measure the trans unsaturated fatty acid content as a result of reductive radical stress on MTs. BIOLOGICAL SIGNIFICANCE The effect of radical stress on the cell metabolism and functions is a very active field of research connecting various disciplines in life sciences. In this contest tandem radical damage has been the subject of recent investigations that pointed out its harmfulness in the general scenario of establishing the consequences of radical stress. By using biomimetic models of tandem damage we have for the first time tested the capability of metallothioneins (MTs), small metalloproteins rich of Cys residues, to damage another cell compartment like lipid membranes when they are undergone to reductive radical stress. The connection of MT reactivity with membrane lipid transformation can give a contribution to the puzzling context of radical stress occurring to biomolecules and the role as biological signaling. To this purpose, MT polypeptides from different organisms, exhibiting different sequence peculiarities, have been analyzed here. The spectroscopic analysis of these systems has allowed to identify modifications affecting metal-thiolate clusters, cystines, and Met residues, acting as efficient interceptors of reducing radical species. The chemical mechanism involving sulfur-containing moieties under reductive conditions discloses new scenarios that bring to the loss of sulfur-centered radicals by desulfurization reactions that change the natural sequences of MTs. Ala is a genetically coded amino acid, therefore the mutation of Cys to Ala occurring to a sequence by the radical process so far discussed, corresponds to a post-translational modification. Research on such mutation connected also to a free radical stress will be important to contribute for a complete picture of the degeneration associated to diseases and aging. Analogously, the Met to Aba mutation occurring after reductive stress transforms a natural amino acid into a natural, non-genetically-coded congener. Aba corresponds to a homologation of the alkyl chains normally present in genetically codified amino acids, such as methyl (in Ala) and isopropyl (in Leu), with an ethyl unit. Based on alkyl substitution, this modification can therefore be studied in order to understand its general consequences on the structure-activity relationships in proteins and, in particular, on molecular interactions. This article is part of a Special issue entitled: Posttranslational Protein modifications in biology and Medicine.
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Kim YO, Jung S, Kim K, Bae HJ. Role of pCeMT, a putative metallothionein from Colocasia esculenta, in response to metal stress. PLANT PHYSIOLOGY AND BIOCHEMISTRY : PPB 2013; 64:25-32. [PMID: 23344478 DOI: 10.1016/j.plaphy.2012.12.009] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/04/2012] [Accepted: 12/03/2012] [Indexed: 05/11/2023]
Abstract
Metallothioneins (MTs) play a major role in metal homeostasis and/or detoxification in plants. In this study, a novel gene, pCeMT, was isolated from Colocasia esculenta and characterized. Our results indicate that Escherichia coli cells expressing pCeMT exhibited enhanced Cd, Cu, and Zn tolerance and accumulation compared with control cells. Furthermore, pCeMT-overexpressing tobacco seedlings displayed better growth under Cd, Cu, and Zn stresses and accumulated more Cd and Zn compared with the wild type. Interestingly, transgenic tobacco displayed markedly decreased hydrogen peroxide (H(2)O(2)) and lipid peroxidation levels under Cd, Cu, and Zn treatments. These results suggest that pCeMT could play an important role in the protection of plant cells from oxidative stress by reactive oxygen species (ROS) scavenging and in the detoxification of free metals by metal binding, leading to improved plant metal tolerance.
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Affiliation(s)
- Yeon-Ok Kim
- Bio-energy Research Institute, Chonnam National University, Gwangju 500-757, Republic of Korea
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16
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Huber T, Freisinger E. Sulfide ions as modulators of metal–thiolate cluster size in a plant metallothionein. Dalton Trans 2013; 42:8878-89. [DOI: 10.1039/c3dt32438a] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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17
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Leszczyszyn OI, Imam HT, Blindauer CA. Diversity and distribution of plant metallothioneins: a review of structure, properties and functions. Metallomics 2013; 5:1146-69. [DOI: 10.1039/c3mt00072a] [Citation(s) in RCA: 133] [Impact Index Per Article: 12.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/04/2023]
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18
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Wan X, Freisinger E. Incorporation of Sulfide Ions into the Cadmium(II) Thiolate Cluster of Cicer arietinum Metallothionein2. Inorg Chem 2012; 52:785-92. [DOI: 10.1021/ic301907j] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Xiaoqiong Wan
- Institute of Inorganic
Chemistry, University of Zurich, 8057 Zurich, Switzerland
- Key Laboratory of Arable Land
Conservation (Middle and Lower Reaches of Yangtse River), Ministry of Agriculture, Huazhong Agricultural University, Wuhan 430070, People's Republic of China
| | - Eva Freisinger
- Institute of Inorganic
Chemistry, University of Zurich, 8057 Zurich, Switzerland
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Kim YO, Lee YG, Patel DH, Kim HM, Ahn SJ, Bae HJ. Zn tolerance of novel Colocasia esculenta metallothionein and its domains in Escherichia coli and tobacco. JOURNAL OF PLANT RESEARCH 2012; 125:793-804. [PMID: 22610130 DOI: 10.1007/s10265-012-0492-8] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/06/2011] [Accepted: 04/07/2012] [Indexed: 06/01/2023]
Abstract
Contrary to extensive researches on the roles of metallothioneins (MTs) in metal tolerance of animals, the roles of plant MTs in metal tolerance are largely under investigation. In this study, we evaluated the functional role of type 2 MT from Colocasia esculenta (CeMT2b) in Zn tolerance of tobacco and E. coli cells. Under Zn-stress conditions, transgenic tobacco overexpressing CeMT2b displayed much better seedling growth, a significant decrease in the levels of H(2)O(2) and an increase in Zn accumulation compared with the wild type. Overexpression of CeMT2b in E. coli greatly enhanced Zn tolerance and Zn accumulation under Zn stresses compared with control cells. CeMT2b bound 5.38 ± 0.29 atoms of Zn per protein. To identify a structural domain of CeMT2b for Zn binding, we investigated the growth of E. coli expressing each of the N-terminal, C-terminal, and central linker domains or a CNC motif deletion from the C-terminus of full-length CeMT2b. The results showed that the CNC motif is required for Zn tolerance, and the N-terminal domain is more effective in Zn tolerance than the C-terminal domain. Taken together, our results provide direct evidence for functional contributions of CeMT2b in Zn tolerance of tobacco and E. coli cells.
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Affiliation(s)
- Yeon-Ok Kim
- Bio-Energy Research Institute, Chonnam National University, 300 Youngbong-Dong, Buk-Gu, Gwangju, 500-757, Republic of Korea
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Gautam N, Verma PK, Verma S, Tripathi RD, Trivedi PK, Adhikari B, Chakrabarty D. Genome-wide identification of rice class I metallothionein gene: tissue expression patterns and induction in response to heavy metal stress. Funct Integr Genomics 2012; 12:635-47. [PMID: 23053198 DOI: 10.1007/s10142-012-0297-9] [Citation(s) in RCA: 59] [Impact Index Per Article: 4.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/23/2012] [Revised: 09/03/2012] [Accepted: 09/24/2012] [Indexed: 01/11/2023]
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21
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Fernandez LR, Vandenbussche G, Roosens N, Govaerts C, Goormaghtigh E, Verbruggen N. Metal binding properties and structure of a type III metallothionein from the metal hyperaccumulator plant Noccaea caerulescens. BIOCHIMICA ET BIOPHYSICA ACTA-PROTEINS AND PROTEOMICS 2012; 1824:1016-23. [DOI: 10.1016/j.bbapap.2012.05.010] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/24/2012] [Revised: 05/07/2012] [Accepted: 05/25/2012] [Indexed: 11/30/2022]
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22
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Kim YO, Patel DH, Lee DS, Song Y, Bae HJ. High cadmium-binding ability of a novel Colocasia esculenta metallothionein increases cadmium tolerance in Escherichia coli and tobacco. Biosci Biotechnol Biochem 2011; 75:1912-20. [PMID: 21979068 DOI: 10.1271/bbb.110289] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Abstract
Experimental evidence in vivo as to the functional roles and binding properties to cadmium (Cd) of type-2 plants metallothionein (MT) has been limited thus far. We investigated the biological role of metallothionein from Colocasia esculenta (CeMT2b) in Escherichia coli and tobacco, and developed a new model for the relationship between Cd tolerance and Cd-binding ability. Heterologous expression of CeMT2b in Escherichia coli greatly enhanced Cd tolerance and accumulated Cd content as compared to control cells. The molecular weight of CeMT2b increased with Cd, and CeMT2b bound up to 5.96±1 molar ratio (Cd/protein). Under Cd stress, transgenic tobacco plants displayed much better seedling growth and high Cd accumulation than the wild type. The presence of an extra CXC motif in CeMT2b contributed to the enhanced Cd-tolerance. The present study provides the first insight into the ability of type-2 plant MT to bind physiological Cd.
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Affiliation(s)
- Yeon-Ok Kim
- Bio-Energy Research Institute, Chonnam National University, Gwangju, Korea
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23
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Interaction of mercury(II) ions with immobilized apo-metallothioneins studied by scanning electrochemical microscopy combined with surface plasmon resonance. Mikrochim Acta 2011. [DOI: 10.1007/s00604-011-0598-z] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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24
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Freisinger E. Structural features specific to plant metallothioneins. J Biol Inorg Chem 2011; 16:1035-45. [PMID: 21688177 DOI: 10.1007/s00775-011-0801-z] [Citation(s) in RCA: 91] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/31/2011] [Accepted: 06/06/2011] [Indexed: 11/26/2022]
Abstract
The metallothionein (MT) superfamily combines a large variety of small cysteine-rich proteins from nearly all phyla of life that have the ability to coordinate various transition metal ions, including Zn(II), Cd(II), and Cu(I). The members of the plant MT family are characterized by great sequence diversity, requiring further subdivision into four subfamilies. Very peculiar and not well understood is the presence of rather long cysteine-free amino acid linkers between the cysteine-rich regions. In light of the distinct differences in sequence to MTs from other families, it seems obvious to assume that these differences will also be manifested on the structural level. This was already impressively demonstrated with the elucidation of the three-dimensional structure of the wheat E(c)-1 MT, which revealed two metal cluster arrangements previously unprecedented for any MT. However, as this structure is so far the only one available for the plant MT family, other sources of information are in high demand. In this review the focus is thus set on any structural features known, deduced, or assumed for the plant MT proteins. This includes the determination of secondary structural elements by circular dichroism, IR, and Raman spectroscopy, the analysis of the influence of the long linker regions, and the evaluation of the spatial arrangement of the sequence separated cysteine-rich regions with the aid of, e.g., limited proteolytic digestion. In addition, special attention is paid to the contents of divalent metal ions as the metal ion to cysteine ratios are important for predicting and understanding possible metal-thiolate cluster structures.
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Affiliation(s)
- Eva Freisinger
- Institute of Inorganic Chemistry, University of Zurich, 8057, Zurich, Switzerland.
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Hassinen VH, Tervahauta AI, Schat H, Kärenlampi SO. Plant metallothioneins--metal chelators with ROS scavenging activity? PLANT BIOLOGY (STUTTGART, GERMANY) 2011; 13:225-32. [PMID: 21309968 DOI: 10.1111/j.1438-8677.2010.00398.x] [Citation(s) in RCA: 70] [Impact Index Per Article: 5.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/18/2023]
Abstract
Metallothioneins (MTs) are ubiquitous cysteine-rich proteins present in plants, animals, fungi and cyanobacteria. In plants, MTs are suggested to be involved in metal tolerance or homeostasis, as they are able to bind metal ions through the thiol groups of their cysteine residues. Recent reports show that MTs are also involved in the scavenging of reactive oxygen species (ROS). The interplay between these roles is not entirely clear. Plants have many MT isoforms with overlapping expression patterns, and no specific role for any of them has been assigned. This review is focused on recent findings on plant MTs.
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Affiliation(s)
- V H Hassinen
- Department of Biosciences, University of Eastern Finland, Kuopio, Finland
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Torreggiani A, Tinti A. Raman spectroscopy a promising technique for investigations of metallothioneins. Metallomics 2010; 2:246-60. [DOI: 10.1039/b922526a] [Citation(s) in RCA: 33] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/22/2023]
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Torreggiani A, Domènech J, Orihuela R, Ferreri C, Atrian S, Capdevila M, Chatgilialoglu C. Zinc and Cadmium Complexes of a Plant Metallothionein under Radical Stress: Desulfurisation Reactions Associated with the Formation oftrans-Lipids in Model Membranes. Chemistry 2009; 15:6015-24. [PMID: 19418517 DOI: 10.1002/chem.200802533] [Citation(s) in RCA: 27] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
Affiliation(s)
- Armida Torreggiani
- ISOF, Consiglio Nazionale delle Ricerche, Via P. Gobetti 101, 40129 Bologna, Italy.
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28
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Schicht O, Freisinger E. Spectroscopic characterization of Cicer arietinum metallothionein 1. Inorganica Chim Acta 2009. [DOI: 10.1016/j.ica.2008.03.097] [Citation(s) in RCA: 33] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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29
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Torreggiani A, Domènech J, Atrian S, Capdevila M, Tinti A. Raman study of in vivo synthesized Zn(II)-metallothionein complexes: Structural insight into metal clusters and protein folding. Biopolymers 2008; 89:1114-24. [DOI: 10.1002/bip.21063] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
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Domènech J, Bofill R, Tinti A, Torreggiani A, Atrian S, Capdevila M. Comparative insight into the Zn(II)-, Cd(II)- and Cu(I)-binding features of the protozoan Tetrahymena pyriformis MT1 metallothionein. BIOCHIMICA ET BIOPHYSICA ACTA-PROTEINS AND PROTEOMICS 2008; 1784:693-704. [DOI: 10.1016/j.bbapap.2008.01.008] [Citation(s) in RCA: 27] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/31/2007] [Revised: 01/03/2008] [Accepted: 01/07/2008] [Indexed: 11/29/2022]
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31
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Freisinger E. Plant MTs—long neglected members of the metallothionein superfamily. Dalton Trans 2008:6663-75. [DOI: 10.1039/b809789e] [Citation(s) in RCA: 89] [Impact Index Per Article: 5.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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