101
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Furukawa Y, Shintani A, Kokubo T. A dual role of cysteine residues in the maturation of prokaryotic Cu/Zn-superoxide dismutase. Metallomics 2021; 13:6353531. [PMID: 34402915 DOI: 10.1093/mtomcs/mfab050] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/04/2021] [Accepted: 08/05/2021] [Indexed: 11/14/2022]
Abstract
Bacterial Cu/Zn-superoxide dismutase (SodC) is an enzyme catalyzing the disproportionation of superoxide radicals, to which the binding of copper and zinc ions and the formation of an intramolecular disulfide bond are essential. We previously showed that Escherichia coli SodC (SodC) was prone to spontaneous degradation in vivo in an immature form prior to the introduction of the disulfide bond. The post-translational maintenance involving the metal binding and the disulfide formation would thus control the stability as well as the enzymatic function of SodC; however, a mechanism of the SodC maturation remains obscure. Here, we show that the disulfide-reduced SodC can secure a copper ion as well as a zinc ion through the thiolate groups. Furthermore, the disulfide-reduced SodC was found to bind cuprous and cupric ions more tightly than SodC with the disulfide bond. The thiolate groups ligating the copper ion were then autooxidized to form the intramolecular disulfide bond, leading to the production of enzymatically active SodC. Based upon the experiments in vitro, therefore, we propose a mechanism for the activation of SodC, in which the conserved Cys residues play a dual role: the acquisition of a copper ion for the enzymatic activity and the formation of the disulfide bond for the structural stabilization.
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Affiliation(s)
- Yoshiaki Furukawa
- Laboratory for Mechanistic Chemistry of Biomolecules, Department of Chemistry, Keio University, Yokohama 223-8522, Japan
| | - Atsuko Shintani
- Laboratory for Mechanistic Chemistry of Biomolecules, Department of Chemistry, Keio University, Yokohama 223-8522, Japan
| | - Teppei Kokubo
- Laboratory for Mechanistic Chemistry of Biomolecules, Department of Chemistry, Keio University, Yokohama 223-8522, Japan
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102
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Espina G, Atalah J, Blamey JM. Extremophilic Oxidoreductases for the Industry: Five Successful Examples With Promising Projections. Front Bioeng Biotechnol 2021; 9:710035. [PMID: 34458243 PMCID: PMC8387880 DOI: 10.3389/fbioe.2021.710035] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/15/2021] [Accepted: 06/30/2021] [Indexed: 11/29/2022] Open
Abstract
In a global context where the development of more environmentally conscious technologies is an urgent need, the demand for enzymes for industrial processes is on the rise. Compared to conventional chemical catalysts, the implementation of biocatalysis presents important benefits including higher selectivity, increased sustainability, reduction in operating costs and low toxicity, which translate into cleaner production processes, lower environmental impact as well as increasing the safety of the operating staff. Most of the currently available commercial enzymes are of mesophilic origin, displaying optimal activity in narrow ranges of conditions, which limits their actual application under industrial settings. For this reason, enzymes from extremophilic microorganisms stand out for their specific characteristics, showing higher stability, activity and robustness than their mesophilic counterparts. Their unique structural adaptations allow them to resist denaturation at high temperatures and salinity, remain active at low temperatures, function at extremely acidic or alkaline pHs and high pressure, and participate in reactions in organic solvents and unconventional media. Because of the increased interest to replace chemical catalysts, the global enzymes market is continuously growing, with hydrolases being the most prominent type of enzymes, holding approximately two-third share, followed by oxidoreductases. The latter enzymes catalyze electron transfer reactions and are one of the most abundant classes of enzymes within cells. They hold a significant industrial potential, especially those from extremophiles, as their applications are multifold. In this article we aim to review the properties and potential applications of five different types of extremophilic oxidoreductases: laccases, hydrogenases, glutamate dehydrogenases (GDHs), catalases and superoxide dismutases (SODs). This selection is based on the extensive experience of our research group working with these particular enzymes, from the discovery up to the development of commercial products available for the research market.
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Affiliation(s)
| | | | - Jenny M. Blamey
- Fundación Biociencia, Santiago, Chile
- Facultad de Química y Biología, Universidad de Santiago de Chile, Santiago, Chile
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103
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Abstract
The ancestors of cyanobacteria generated Earth's first biogenic molecular oxygen, but how they dealt with oxidative stress remains unconstrained. Here we investigate when superoxide dismutase enzymes (SODs) capable of removing superoxide free radicals evolved and estimate when Cyanobacteria originated. Our Bayesian molecular clocks, calibrated with microfossils, predict that stem Cyanobacteria arose 3300-3600 million years ago. Shortly afterwards, we find phylogenetic evidence that ancestral cyanobacteria used SODs with copper and zinc cofactors (CuZnSOD) during the Archaean. By the Paleoproterozoic, they became genetically capable of using iron, nickel, and manganese as cofactors (FeSOD, NiSOD, and MnSOD respectively). The evolution of NiSOD is particularly intriguing because it corresponds with cyanobacteria's invasion of the open ocean. Our analyses of metalloenzymes dealing with reactive oxygen species (ROS) now demonstrate that marine geochemical records alone may not predict patterns of metal usage by phototrophs from freshwater and terrestrial habitats.
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104
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Harada M, Akiyama A, Furukawa R, Yokobori SI, Tajika E, Yamagishi A. Evolution of Superoxide Dismutases and Catalases in Cyanobacteria: Occurrence of the Antioxidant Enzyme Genes before the Rise of Atmospheric Oxygen. J Mol Evol 2021; 89:527-543. [PMID: 34274981 DOI: 10.1007/s00239-021-10021-5] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/20/2021] [Accepted: 06/22/2021] [Indexed: 11/29/2022]
Abstract
Knowledge on the evolution of antioxidant systems in cyanobacteria is crucial for elucidating the cause and consequence of the rise of atmospheric oxygen in the Earth's history. In this study, to elucidate the origin and evolution of cyanobacterial antioxidant enzymes, we analyzed the occurrence of genes encoding four types of superoxide dismutases and three types of catalases in 85 complete cyanobacterial genomes, followed by phylogenetic analyses. We found that Fe superoxide dismutase (FeSOD), Mn superoxide dismutase (MnSOD), and Mn catalase (MnCat) are widely distributed among modern cyanobacteria, whereas CuZn superoxide dismutase (CuZnSOD), bifunctional catalase (KatG), and monofunctional catalase (KatE) are less common. Ni superoxide dismutase (NiSOD) is distributed among marine Prochlorococcus and Synechococcus species. Phylogenetic analyses suggested that bacterial MnSOD evolved from cambialistic Fe/MnSOD before the diversification of major bacterial lineages. The analyses suggested that FeSOD evolved from MnSOD before the origin of cyanobacteria. MnCat also evolved in the early stages of bacterial evolution, predating the emergence of cyanobacteria. KatG, KatE, and NiSOD appeared 2.3-2.5 billion years ago. Thus, almost all cyanobacterial antioxidant enzymes emerged before or during the rise of atmospheric oxygen. The loss and appearance of these enzymes in marine cyanobacteria may be also related to the change in the metal concentration induced by the increased oxygen concentration in the ocean.
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Affiliation(s)
- Mariko Harada
- Faculty of Life and Environmental Sciences, University of Tsukuba, 1-1-1 Tennodai, Tsukuba, 305-8572, Japan.
| | - Ayumi Akiyama
- Department of Earth & Planetary Science, The University of Tokyo, Bunkyo, 133-0033, Japan
| | - Ryutaro Furukawa
- Faculty of Human Sciences, Waseda University, Tokorozawa, 359-1192, Japan
| | - Shin-Ichi Yokobori
- Department of Applied Life Sciences, Tokyo University of Pharmacy and Life Sciences, Hachioji, 192-0392, Japan
| | - Eiichi Tajika
- Department of Earth & Planetary Science, The University of Tokyo, Bunkyo, 133-0033, Japan
| | - Akihiko Yamagishi
- Department of Applied Life Sciences, Tokyo University of Pharmacy and Life Sciences, Hachioji, 192-0392, Japan
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105
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Qiu S, Chen X, Zhai Y, Cui W, Ai X, Rao S, Chen J, Yan F. Downregulation of Light-Harvesting Complex II Induces ROS-Mediated Defense Against Turnip Mosaic Virus Infection in Nicotiana benthamiana. Front Microbiol 2021; 12:690988. [PMID: 34290685 PMCID: PMC8287655 DOI: 10.3389/fmicb.2021.690988] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/06/2021] [Accepted: 06/14/2021] [Indexed: 12/05/2022] Open
Abstract
The light-harvesting chlorophyll a/b complex protein 3 (LHCB3) of photosystem II plays important roles distributing the excitation energy and modulating the rate of state transition and stomatal response to abscisic acid. However, the functions of LHCB3 in plant immunity have not been well investigated. Here, we show that the expression of LHCB3 in Nicotiana benthamiana (NbLHCB3) was down-regulated by turnip mosaic virus (TuMV) infection. When NbLHCB3 was silenced by tobacco rattle virus-induced gene silencing, systemic infection of TuMV was inhibited. H2O2 was over-accumulated in NbLHCB3-silenced plants. Chemical treatment to inhibit or eliminate reactive oxygen species (ROS) impaired the resistance of the NbLHCB3-silenced plants to TuMV infection. Co-silencing of NbLHCB3 with genes involved in ROS production compromised the resistance of plants to TuMV but co-silencing of NbLHCB3 with genes in the ROS scavenging pathway increased resistance to the virus. Transgenic plants overexpressing NbLHCB3 were more susceptible to TuMV. These results indicate that downregulation of NbLHCB3 is involved in defense against TuMV by inducing ROS production.
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Affiliation(s)
- Shiyou Qiu
- College of Life Sciences, Fujian Agriculture and Forestry University, Fuzhou, China.,State Key Laboratory for Managing Biotic and Chemical Threats to the Quality and Safety of Agro-products, Institute of Plant Virology, Ningbo University, Ningbo, China.,Key Laboratory of Biotechnology in Plant Protection of MOA of China and Zhejiang Province, Institute of Virology and Biotechnology, Zhejiang Academy of Agricultural Sciences, Hangzhou, China
| | - Xuwei Chen
- State Key Laboratory for Managing Biotic and Chemical Threats to the Quality and Safety of Agro-products, Institute of Plant Virology, Ningbo University, Ningbo, China
| | - Yushan Zhai
- State Key Laboratory for Managing Biotic and Chemical Threats to the Quality and Safety of Agro-products, Institute of Plant Virology, Ningbo University, Ningbo, China.,Key Laboratory of Biotechnology in Plant Protection of MOA of China and Zhejiang Province, Institute of Virology and Biotechnology, Zhejiang Academy of Agricultural Sciences, Hangzhou, China
| | - Weijun Cui
- State Key Laboratory for Managing Biotic and Chemical Threats to the Quality and Safety of Agro-products, Institute of Plant Virology, Ningbo University, Ningbo, China.,Key Laboratory of Biotechnology in Plant Protection of MOA of China and Zhejiang Province, Institute of Virology and Biotechnology, Zhejiang Academy of Agricultural Sciences, Hangzhou, China
| | - Xuhong Ai
- College of Life Sciences, Fujian Agriculture and Forestry University, Fuzhou, China.,State Key Laboratory for Managing Biotic and Chemical Threats to the Quality and Safety of Agro-products, Institute of Plant Virology, Ningbo University, Ningbo, China.,Key Laboratory of Biotechnology in Plant Protection of MOA of China and Zhejiang Province, Institute of Virology and Biotechnology, Zhejiang Academy of Agricultural Sciences, Hangzhou, China
| | - Shaofei Rao
- State Key Laboratory for Managing Biotic and Chemical Threats to the Quality and Safety of Agro-products, Institute of Plant Virology, Ningbo University, Ningbo, China
| | - Jianping Chen
- College of Life Sciences, Fujian Agriculture and Forestry University, Fuzhou, China.,State Key Laboratory for Managing Biotic and Chemical Threats to the Quality and Safety of Agro-products, Institute of Plant Virology, Ningbo University, Ningbo, China.,Key Laboratory of Biotechnology in Plant Protection of MOA of China and Zhejiang Province, Institute of Virology and Biotechnology, Zhejiang Academy of Agricultural Sciences, Hangzhou, China
| | - Fei Yan
- State Key Laboratory for Managing Biotic and Chemical Threats to the Quality and Safety of Agro-products, Institute of Plant Virology, Ningbo University, Ningbo, China.,Key Laboratory of Biotechnology in Plant Protection of MOA of China and Zhejiang Province, Institute of Virology and Biotechnology, Zhejiang Academy of Agricultural Sciences, Hangzhou, China
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106
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Fesharaki-Esfahani M, Shahpiri A, Kazemi-Nasab A. A highly efficient, thermo stable and broad pH adaptable copper-zinc super oxide dismutase (AmSOD1) mediates hydrogen peroxide tolerance in Avicennia marina. PHYTOCHEMISTRY 2021; 187:112766. [PMID: 33878605 DOI: 10.1016/j.phytochem.2021.112766] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/21/2021] [Revised: 03/31/2021] [Accepted: 04/03/2021] [Indexed: 06/12/2023]
Abstract
Avicennia marina is a widely distributed mangrove species with high tolerance to salt, oxidative stress and heavy metals. In the preset work, we found that superoxide dismutase (SOD) activity increases in Avicennia marina leaves in response to salt and hydrogen peroxide. Monitoring the SOD using Western blot analysis revealed that the accumulation of SOD increased in response to hydrogen peroxide but not in response to salinity stress. Here we also isolated and cloned a gene encoding AmSOD1 which was classified into the group of plant CuZnSODs based on amino acid sequence analysis. AmSOD1 was heterologously expressed in the soluble fraction of E. coli strain Rosetta (DE3). The cells expressing His-AmSOD1 were more tolerant in response to hydrogen peroxide treatment but not salt stress, suggesting the involvement of AmSOD1 in hydrogen peroxide tolerance. The enzyme His-AmSOD1 exhibited a molecular mass of 38 kDa, but it could be monomer in reducing conditions indicating a double-strand protein with intra-molecular disulfide bridge. There are two copper and two zinc moles per mole of dimer form of His-AmSOD1 suggesting the binding of one copper and one zinc ions to each monomer. The Pure His-AmSOD1 was highly active in vitro and its activity was considerably enhanced when the growth medium of the cells producing AmSOD1 was supplemented with Cu2+. The high stability of the recombinant AmSOD1 after incubation in a broad range pH and high temperature is a distinctive feature for AmSOD1, which may open new insights for application of AmSOD1 as a protein drug in different medical purposes.
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Affiliation(s)
- Monireh Fesharaki-Esfahani
- Department of Biotechnology, College of Agriculture, Isfahan University of Technology, Isfahan, 84156-83111, Iran
| | - Azar Shahpiri
- Department of Biotechnology, College of Agriculture, Isfahan University of Technology, Isfahan, 84156-83111, Iran.
| | - Akram Kazemi-Nasab
- Department of Biotechnology, College of Agriculture, Isfahan University of Technology, Isfahan, 84156-83111, Iran
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107
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Wang LT, Lv MJ, An JY, Fan XH, Dong MZ, Zhang SD, Wang JD, Wang YQ, Cai ZH, Fu YJ. Botanical characteristics, phytochemistry and related biological activities of Rosa roxburghii Tratt fruit, and its potential use in functional foods: a review. Food Funct 2021; 12:1432-1451. [PMID: 33533385 DOI: 10.1039/d0fo02603d] [Citation(s) in RCA: 60] [Impact Index Per Article: 20.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022]
Abstract
Due to the growing global population, reduction in arable land and effects of climate change, incongruity between food supply and demand has become increasingly severe. Nowadays, with awareness of the elementary nutrients required for human growth, increasing attention is being paid to the health and medical functions of food. Along with increased food production achieved by modern agricultural techniques, underutilised functional foods are an important strategy for solving food security problems and maintaining the nutritional quality of the human diet. Rosa roxburghii Tratt (RRT) is a natural fruit that contains unique functional and nutritional constituents, which are characterised by a high anti-oxidant potential. This review summarises the biological characteristics, chemical composition, health-promoting properties and development status of RRT products to inspire investigations on the use of RRT fruit as a functional food, dietary supplement and pharmaceutical additive. The nutrients and functional ingredients of RRT fruit are described in detail to provide more reference information for nutritionists and pharmacists.
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Affiliation(s)
- Li-Tao Wang
- The College of Forestry, Beijing Forestry University, 100083, Beijing, PR China.
| | - Mu-Jie Lv
- The College of Forestry, Beijing Forestry University, 100083, Beijing, PR China.
| | - Juan-Yan An
- The College of Forestry, Beijing Forestry University, 100083, Beijing, PR China.
| | - Xiao-Hong Fan
- The College of Forestry, Beijing Forestry University, 100083, Beijing, PR China.
| | - Ming-Zhu Dong
- The College of Forestry, Beijing Forestry University, 100083, Beijing, PR China.
| | - Sun-Dong Zhang
- Laboratory of Forest Plant Ecology, Ministry of Education, Northeast Forestry University, 150040, Harbin, PR China
| | - Jian-Dong Wang
- The College of Forestry, Beijing Forestry University, 100083, Beijing, PR China.
| | - Yan-Qiu Wang
- The College of Forestry, Beijing Forestry University, 100083, Beijing, PR China.
| | - Zi-Hui Cai
- The College of Forestry, Beijing Forestry University, 100083, Beijing, PR China.
| | - Yu-Jie Fu
- The College of Forestry, Beijing Forestry University, 100083, Beijing, PR China. and Laboratory of Forest Plant Ecology, Ministry of Education, Northeast Forestry University, 150040, Harbin, PR China and Advanced Innovation Center for Tree Breeding by Molecular Design, Beijing Forestry University, 100083, Beijing, PR China
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108
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Tandon S, Steuber FW, Kathalikkattil AC, Venkatesan M, Watson GW, Schmitt W. Modulating Structural and Electronic Properties of Rare Archimedean and Johnson-Type Mn Cages. Inorg Chem 2021; 60:8388-8393. [PMID: 34076418 DOI: 10.1021/acs.inorgchem.1c00984] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
High-nuclearity Mn complexes have attracted significant scientific attention due to their fascinating magnetic properties and their relevance to bioinorganic systems and catalysis. In this work, we demonstrate how the strong binding characteristics of phosphonate ligands can be coupled with sterically hindered carboxylate groups to influence the symmetry of Mn coordination clusters. We describe the structure of two high-nuclearity Mn coordination cages, {Mn12} and {Mn15}, synthesized using this approach. These cages are structurally related to the truncated tetrahedral geometry and adopt rare topological features of Archimedean and Johnson-type solids. Their structural attributes distinctively influence their magnetic properties and electrocatalytic H2O oxidation characteristics.
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Affiliation(s)
- Swetanshu Tandon
- School of Chemistry & CRANN Institute, University of Dublin, Trinity College, Dublin 2, Ireland.,AMBER Center, University of Dublin, Trinity College, Dublin 2, Ireland
| | - Friedrich W Steuber
- School of Chemistry & CRANN Institute, University of Dublin, Trinity College, Dublin 2, Ireland.,AMBER Center, University of Dublin, Trinity College, Dublin 2, Ireland
| | - Amal C Kathalikkattil
- School of Chemistry & CRANN Institute, University of Dublin, Trinity College, Dublin 2, Ireland.,AMBER Center, University of Dublin, Trinity College, Dublin 2, Ireland
| | - Munuswamy Venkatesan
- School of Physics & CRANN Institute, University of Dublin, Trinity College, Dublin 2, Ireland
| | - Graeme W Watson
- School of Chemistry & CRANN Institute, University of Dublin, Trinity College, Dublin 2, Ireland
| | - Wolfgang Schmitt
- School of Chemistry & CRANN Institute, University of Dublin, Trinity College, Dublin 2, Ireland.,AMBER Center, University of Dublin, Trinity College, Dublin 2, Ireland
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109
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Tian R, Geng Y, Guo H, Yang C, Seim I, Yang G. Comparative analysis of the superoxide dismutase gene family in Cetartiodactyla. J Evol Biol 2021; 34:1046-1060. [PMID: 33896059 DOI: 10.1111/jeb.13792] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/13/2021] [Revised: 03/29/2021] [Accepted: 04/16/2021] [Indexed: 12/18/2022]
Abstract
Cetacea, whales, dolphins and porpoises form an order of mammals adapted to aquatic life. Their transition to an aquatic habitat resulted in exceptional protection against cellular insults, including oxidative and osmotic stress. Here, we considered the structure and molecular evolution of the superoxide dismutase (SOD) gene family, which encodes essential enzymes in the mammalian antioxidant system, in the superorder Cetartiodactyla. To this end, we juxtaposed cetaceans and their closest extant relatives (order Artiodactyla). We identified 94 genes in 23 species, of which 70 are bona fide intact genes. Although the SOD gene family is conserved in Cetartiodactyla, lineage-specific gene duplications and deletions were observed. Phylogenetic analyses show that the SOD2 subfamily diverged from a clade containing SOD1 and SOD3, suggesting that cytoplasmic, extracellular and mitochondrial SODs have started down independent evolutionary paths. Specific-amino acid changes (e.g. K130N in SOD2) that may enhance ROS elimination were identified in cetaceans. In silico analysis suggests that the core transcription factor repertoire of cetartiodactyl SOD genes may include Sp1, NF-κB, Nrf2 and AHR. Putative transcription factors binding sites responding to hypoxia were (e.g. Suppressor of Hairless; Su(H)) found in the cetacean SOD1 gene. We found significant evidence for positive selection in cetaceans using codon models. Cetaceans with different diving abilities also show divergent evolution of SOD1 and SOD2. Our genome-wide analysis of SOD genes helps clarify their relationship and evolutionary trajectory and identify putative functional changes in cetaceans.
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Affiliation(s)
- Ran Tian
- Integrative Biology Laboratory, College of Life Sciences, Nanjing Normal University, Nanjing, China.,Jiangsu Key Laboratory for Biodiversity and Biotechnology, College of Life Sciences, Nanjing Normal University, Nanjing, China
| | - Yuepan Geng
- Integrative Biology Laboratory, College of Life Sciences, Nanjing Normal University, Nanjing, China
| | - Han Guo
- Integrative Biology Laboratory, College of Life Sciences, Nanjing Normal University, Nanjing, China
| | - Chen Yang
- Integrative Biology Laboratory, College of Life Sciences, Nanjing Normal University, Nanjing, China
| | - Inge Seim
- Integrative Biology Laboratory, College of Life Sciences, Nanjing Normal University, Nanjing, China.,School of Biology and Environmental Science, Queensland University of Technology, Brisbane, QLD, Australia
| | - Guang Yang
- Jiangsu Key Laboratory for Biodiversity and Biotechnology, College of Life Sciences, Nanjing Normal University, Nanjing, China
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110
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Isolation and in silico analysis of antioxidants in response to temporal variations in the cyanobacterium Oscillatoria sp. GENE REPORTS 2021. [DOI: 10.1016/j.genrep.2021.101023] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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111
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Napoli A, Iacovelli F, Fagliarone C, Pascarella G, Falconi M, Billi D. Genome-Wide Identification and Bioinformatics Characterization of Superoxide Dismutases in the Desiccation-Tolerant Cyanobacterium Chroococcidiopsis sp. CCMEE 029. Front Microbiol 2021; 12:660050. [PMID: 34122375 PMCID: PMC8193680 DOI: 10.3389/fmicb.2021.660050] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/28/2021] [Accepted: 04/27/2021] [Indexed: 11/13/2022] Open
Abstract
A genome-wide investigation of the anhydrobiotic cyanobacterium Chroococcidiopsis sp. CCMEE 029 identified three genes coding superoxide dismutases (SODs) annotated as MnSODs (SodA2.1 and SodA2.2) and Cu/ZnSOD (SodC) as suggested by the presence of metal-binding motifs and conserved sequences. Structural bioinformatics analysis of the retrieved sequences yielded modeled MnSODs and Cu/ZnSOD structures that were fully compatible with their functional role. A signal-peptide bioinformatics prediction identified a Tat signal peptide at the N-terminus of the SodA2.1 that highlighted its transport across the thylakoid/cytoplasmic membranes and release in the periplasm/thylakoid lumen. Homologs of the Tat transport system were identified in Chroococcidiopsis sp. CCMEE 029, and the molecular docking simulation confirmed the interaction between the signal peptide of the SodA2.1 and the modeled TatC receptor, thus supporting the SodA2.1 translocation across the thylakoid/cytoplasmic membranes. No signal peptide was predicted for the MnSOD (SodA2.2) and Cu/ZnSOD, thus suggesting their occurrence as cytoplasmic proteins. No FeSOD homologs were identified in Chroococcidiopsis sp. CCMEE 029, a feature that might contribute to its desiccation tolerance since iron produces hydroxyl radical via the Fenton reaction. The overall-overexpression in response to desiccation of the three identified SOD-coding genes highlighted the role of SODs in the antioxidant enzymatic defense of this anhydrobiotic cyanobacterium. The periplasmic MnSOD protected the cell envelope against oxidative damage, the MnSOD localized in the thylakoid lumen scavengered superoxide anion radical produced during the photosynthesis, while the cytoplasmic MnSOD and Cu/ZnSOD reinforced the defense against reactive oxygen species generated at the onset of desiccation. Results contribute to decipher the desiccation-tolerance mechanisms of this cyanobacterium and allow the investigation of its oxidative stress response during future space experiments in low Earth orbit and beyond.
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Affiliation(s)
| | | | | | | | - Mattia Falconi
- Department of Biology, University of Rome Tor Vergata, Rome, Italy
| | - Daniela Billi
- Department of Biology, University of Rome Tor Vergata, Rome, Italy
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112
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Saini A, Rohila JS, Govindan G, Li YF, Sunkar R. Splice Variants of Superoxide Dismutases in Rice and Their Expression Profiles under Abiotic Stresses. Int J Mol Sci 2021; 22:ijms22083997. [PMID: 33924430 PMCID: PMC8068833 DOI: 10.3390/ijms22083997] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/24/2021] [Accepted: 04/11/2021] [Indexed: 01/02/2023] Open
Abstract
The superoxide dismutases (SODs) play vital roles in controlling cellular reactive oxygen species (ROS) that are generated both under optimal as well as stress conditions in plants. The rice genome harbors seven SOD genes (CSD1, CSD2, CSD3, CSD4, FSD1, FSD2, and MSD) that encode seven constitutive transcripts. Of these, five (CSD2, CSD3, CSD4, FSD1, and MSD) utilizes an alternative splicing (AS) strategy and generate seven additional splice variants (SVs) or mRNA variants, i.e., three for CSD3, and one each for CSD2, CSD4, FSD1, and MSD. The exon-intron organization of these SVs revealed variations in the number and length of exons and/or untranslated regions (UTRs). We determined the expression patterns of SVs along with their constitutive forms of SODs in rice seedlings exposed to salt, osmotic, cold, heavy metal (Cu+2) stresses, as well as copper-deprivation. The results revealed that all seven SVs were transcriptionally active in both roots and shoots. When compared to their corresponding constitutive transcripts, the profiles of five SVs were almost similar, while two specific SVs (CSD3-SV4 and MSD-SV2) differed significantly, and the differences were also apparent between shoots and roots suggesting that the specific SVs are likely to play important roles in a tissue-specific and stress-specific manner. Overall, the present study has provided a comprehensive analysis of the SVs of SODs and their responses to stress conditions in shoots and roots of rice seedlings.
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Affiliation(s)
- Ajay Saini
- Department of Biochemistry and Molecular Biology, Oklahoma State University, Stillwater, OK 74078, USA; (A.S.); (G.G.); (Y.-F.L.)
- Bhabha Atomic Research Centre, Molecular Biology Division, Trombay, Mumbai, Maharashtra 400085, India
- Homi Bhabha National Institute, Anushaktinagar, Trombay, Mumbai, Maharashtra 400094, India
| | - Jai S. Rohila
- Dale Bumpers National Rice Research Center, United States Department of Agriculture-Agricultural Research Services, Stuttgart, AR 72160, USA;
| | - Ganesan Govindan
- Department of Biochemistry and Molecular Biology, Oklahoma State University, Stillwater, OK 74078, USA; (A.S.); (G.G.); (Y.-F.L.)
| | - Yong-Fang Li
- Department of Biochemistry and Molecular Biology, Oklahoma State University, Stillwater, OK 74078, USA; (A.S.); (G.G.); (Y.-F.L.)
| | - Ramanjulu Sunkar
- Department of Biochemistry and Molecular Biology, Oklahoma State University, Stillwater, OK 74078, USA; (A.S.); (G.G.); (Y.-F.L.)
- Correspondence:
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113
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Kuchovská E, Morin B, López-Cabeza R, Barré M, Gouffier C, Bláhová L, Cachot J, Bláha L, Gonzalez P. Comparison of imidacloprid, propiconazole, and nanopropiconazole effects on the development, behavior, and gene expression biomarkers of the Pacific oyster (Magallana gigas). THE SCIENCE OF THE TOTAL ENVIRONMENT 2021; 764:142921. [PMID: 33757243 DOI: 10.1016/j.scitotenv.2020.142921] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/25/2020] [Revised: 10/05/2020] [Accepted: 10/05/2020] [Indexed: 06/12/2023]
Abstract
Coastal areas are final recipients of various contaminants including pesticides. The effects of pesticides on non-target organisms are often unclear, especially at environmentally relevant concentrations. This study investigated the impacts of insecticide imidacloprid (IMI) and fungicide propiconazole (PRO), some of the most detected pesticides in the Arcachon Bay in France. This work also included the research of propiconazole nanoformulation (nanoPRO). The effects were assessed studying the development of the early life stages of the Pacific oyster (Magallana gigas). Oyster embryos were exposed for 24, 30, and 42 h (depending on the endpoint) at 24 °C to environmentally relevant concentrations of the two pesticides as well as to nanoPRO. The research focused on sublethal endpoints such as the presence of developmental malformations, alterations of locomotion patterns, or changes in the gene expression levels. No developmental abnormalities were observed after exposure to environmental concentrations detected in the Arcachon Bay in recent years (maximal detected concentration of IMI and PRO were 174 ng/L and 29 ng/L, respectively). EC50 of PRO and nanoPRO were comparable, 2.93 ± 1.35 and 2.26 ± 1.36 mg/L, while EC50 of IMI exceeded 200 mg/L. IMI did not affect larval behavior. PRO affected larval movement trajectory and decreased average larvae swimming speed (2 μg/L), while nanoPRO increased the maximal larvae swimming speed (0.02 μg/L). PRO upregulated especially genes linked to reactive oxygen species (ROS) production and detoxification. NanoPRO effects on gene expression were less pronounced - half of the genes were altered in comparison with PRO. IMI induced a strong dose-response impact on the genes linked to the detoxification, ROS production, cell cycle, and apoptosis regulation. In conclusion, our results suggest that current pesticide concentrations detected in the Arcachon Bay are safe for the Pacific oyster early development, but they might have a small direct effect via altered gene expressions, whose longer-term impacts cannot be ruled out.
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Affiliation(s)
- Eliška Kuchovská
- Masaryk University, Faculty of Science, RECETOX, Kamenice 753/5, 625 00 Brno, Czech Republic; Univ. Bordeaux, CNRS, EPOC, EPHE, UMR 5805, F-33600 Pessac, France
| | - Bénédicte Morin
- Univ. Bordeaux, CNRS, EPOC, EPHE, UMR 5805, F-33600 Pessac, France
| | - Rocío López-Cabeza
- Masaryk University, Faculty of Science, RECETOX, Kamenice 753/5, 625 00 Brno, Czech Republic
| | - Mathilde Barré
- Univ. Bordeaux, CNRS, EPOC, EPHE, UMR 5805, F-33600 Pessac, France
| | | | - Lucie Bláhová
- Masaryk University, Faculty of Science, RECETOX, Kamenice 753/5, 625 00 Brno, Czech Republic
| | - Jérôme Cachot
- Univ. Bordeaux, CNRS, EPOC, EPHE, UMR 5805, F-33600 Pessac, France
| | - Luděk Bláha
- Masaryk University, Faculty of Science, RECETOX, Kamenice 753/5, 625 00 Brno, Czech Republic
| | - Patrice Gonzalez
- Univ. Bordeaux, CNRS, EPOC, EPHE, UMR 5805, F-33600 Pessac, France.
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114
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Dong X, Wang W, Li S, Han H, Lv P, Yang C. Thermoacidophilic Alicyclobacillus Superoxide Dismutase: Good Candidate as Additives in Food and Medicine. Front Microbiol 2021; 12:577001. [PMID: 33815303 PMCID: PMC8014015 DOI: 10.3389/fmicb.2021.577001] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/28/2020] [Accepted: 02/26/2021] [Indexed: 11/30/2022] Open
Abstract
Thermoacidophilic Alicyclobacillus strains attract great interests as the resource of thermostable or acidic enzymes. In this study, a putative gene encoding superoxide dismutase (AaSOD) was identified in a thermoacidophilic Alicyclobacillus strain. With a 16-fold activity observed, the AaSOD activity expressing in the medium of manganese enrichment was much higher than that in the iron medium. In addition, the purified AaSOD can be reconstituted exclusively with either Fe2+ or Mn2+, with its Mn-bound protein showing 25-fold activity than that of Fe-bound form. The optimal temperature for AaSOD reaction was 35°C, and was highly stable at any certain temperature up to 80°C. Of particular interest, the enzyme is found to be very stable across a wide pH range spanning from 2.0 to 10.0, which confers its robust stability in the acidic stomach environment and implies striking potentials as food additive and for medical use.
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Affiliation(s)
- Xueqian Dong
- State Key Laboratory of Microbial Technology, Institute of Microbial Technology, Shandong University, Qingdao, China.,Shandong Food Ferment Industry Research & Design Institute, QiLu University of Technology (Shandong Academy of Sciences), Jinan, China
| | - Wei Wang
- Shandong Food Ferment Industry Research & Design Institute, QiLu University of Technology (Shandong Academy of Sciences), Jinan, China
| | - Shannan Li
- State Key Laboratory of Microbial Technology, Institute of Microbial Technology, Shandong University, Qingdao, China
| | - Hongyu Han
- Shandong Food Ferment Industry Research & Design Institute, QiLu University of Technology (Shandong Academy of Sciences), Jinan, China
| | - Peiwen Lv
- State Key Laboratory of Microbial Technology, Institute of Microbial Technology, Shandong University, Qingdao, China
| | - Chunyu Yang
- State Key Laboratory of Microbial Technology, Institute of Microbial Technology, Shandong University, Qingdao, China
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115
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Zhang G, Ding Q, Wei B. Genome-wide identification of superoxide dismutase gene families and their expression patterns under low-temperature, salt and osmotic stresses in watermelon and melon. 3 Biotech 2021; 11:194. [PMID: 33927985 DOI: 10.1007/s13205-021-02726-7] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/22/2020] [Accepted: 03/10/2021] [Indexed: 12/01/2022] Open
Abstract
The growth and development of watermelon and melon are affected by abiotic stresses such as cold, salinity and drought. Plant superoxide dismutase (SOD) proteins exerted great effects on plant growth, development and response to abiotic stresses. However, little is known about the characteristics of watermelon and melon SOD gene families and their expression patterns under abiotic stresses. In this study, the genome-wide identification of SOD genes and their expression patterns under abiotic stresses has been done in watermelon and melon. Seven SODs were identified in watermelon and melon, respectively. Chromosome location indicated that the SODs were dispersedly distributed on 4-6 chromosomes. Almost all the SOD proteins contained 300 amino acids or less and the intron numbers of SODs ranged from 5 to 7. On the basis of phylogenetic analysis, the SODs were classified into six sub-groups which was also verified by similar motif composition, gene structure and sub-cellular location. Gene ontology analysis displayed that many SOD proteins participated in binding, catalytic, antioxidant activity and stimulus-response. Cis-regulatory elements related to stresses and hormones were found in the promoters of the SODs. Based on the quantitative real-time PCR, most of CmSOD and ClSOD genes showed obvious up-regulation under low-temperature, NaCl and PEG6000 treatments. The abiotic stress-responsive SOD genes were identified to improve watermelon and melon tolerance against abiotic stresses. This was a preliminary study to describe the genome-wide analysis of SOD gene family in watermelon and melon, and the results would facilitate further study of gene cloning and functional verification of SOD genes response to abiotic stresses in watermelon and melon. SUPPLEMENTARY INFORMATION The online version contains supplementary material available at 10.1007/s13205-021-02726-7.
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Affiliation(s)
- Gaoyuan Zhang
- College of Horticulture, Gansu Agricultural University, Lanzhou, 730070 Gansu China
| | - Qian Ding
- College of Floriculture, Weifang Engineering Vocational College, Qingzhou, 262500 Shandong China
| | - Bingqiang Wei
- College of Horticulture, Gansu Agricultural University, Lanzhou, 730070 Gansu China
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116
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The role of S126 in the Staphylococcus equorum MnSOD activity and stability. J Struct Biol 2021; 213:107731. [PMID: 33794368 DOI: 10.1016/j.jsb.2021.107731] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/14/2020] [Revised: 03/23/2021] [Accepted: 03/24/2021] [Indexed: 11/21/2022]
Abstract
The dimeric form of manganese superoxide dismutase is instrumental for activity because each of the monomers provides amino acid residues participating in the enzymatic reaction. Hence, preventing dissociation of the dimer would maintain the enzymatic activity in detrimental conditions e.g. high temperature. To prevent dissociation of the dimer, a disulphide (S-S) bond was introduced at the dimer interface. In the wild type structure, S126 interacts with S126 of the other monomer. In the presented work, a mutant was designed with an S126C substitution. The crystal structure of the S126C mutant showed that only 50-70% of monomers formed the S-S bond. This observed imperfect S-S bonding was likely caused by photolytic S-S bond breakage mediated by the neighbouring tryptophan residue. In the wild type, S126 is located facing W163 and forms a water-mediated hydrogen bond with E164; W163 and E164 are crucial in the enzyme's activity. The replacement of S126 by a cysteine residue lowered the activity of the enzyme by ~70%. S126 has never been considered to play a role in the enzyme's activity or stability, thus the finding showed the importance of this residue.
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117
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Bovio F, Sciandrone B, Urani C, Fusi P, Forcella M, Regonesi ME. Superoxide dismutase 1 (SOD1) and cadmium: A three models approach to the comprehension of its neurotoxic effects. Neurotoxicology 2021; 84:125-135. [PMID: 33774064 DOI: 10.1016/j.neuro.2021.03.007] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/08/2021] [Revised: 03/19/2021] [Accepted: 03/19/2021] [Indexed: 12/13/2022]
Abstract
Cadmium (Cd) is a widespread toxic environmental contaminant, released by anthropogenic activities. It interferes with essential metal ions homeostasis and affects protein structures and functions by substituting zinc, copper and iron. In this study, the effect of cadmium on SOD1, a CuZn metalloenzyme catalyzing superoxide conversion into hydrogen peroxide, has been investigated in three different biological models. We first evaluated the effects of cadmium combined with copper and/or zinc on the recombinant GST-SOD1, expressed in E. coli BL21. The enzyme activity and expression were investigated in the presence of fixed copper and/or zinc doses with different cadmium concentrations, in the cellular medium. Cadmium caused a dose-dependent reduction in SOD1 activity, while the expression remains constant. Similar results were obtained in the cellular model represented by the human SH-SY5Y neuronal cell line. After cadmium treatment for 24 and 48 h, SOD1 enzymatic activity decreased in a dose- and time-dependent way, while the protein expression remained constant. Finally, a 16 h cadmium treatment caused a 25 % reduction of CuZn-SOD activity without affecting the protein expression in the Caenorhabditis elegans model. Taken together our results show an inhibitory effect of cadmium on SOD1 enzymatic activity, without affecting the protein expression, in all the biological models used, suggesting that cadmium can displace zinc from the enzyme catalytic site.
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Affiliation(s)
- Federica Bovio
- Department of Biotechnology and Biosciences, University of Milano-Bicocca, Piazza della Scienza, 2, 20126, Milan, Italy
| | - Barbara Sciandrone
- Department of Biotechnology and Biosciences, University of Milano-Bicocca, Piazza della Scienza, 2, 20126, Milan, Italy
| | - Chiara Urani
- Department of Earth and Environmental Sciences, University of Milano-Bicocca, Piazza della Scienza 1, 20126, Milan, Italy; Integrated Models for Prevention and Protection in Environmental and Occupational Health, (MISTRAL), Interuniversity Research Center, Italy
| | - Paola Fusi
- Department of Biotechnology and Biosciences, University of Milano-Bicocca, Piazza della Scienza, 2, 20126, Milan, Italy; Integrated Models for Prevention and Protection in Environmental and Occupational Health, (MISTRAL), Interuniversity Research Center, Italy.
| | - Matilde Forcella
- Department of Biotechnology and Biosciences, University of Milano-Bicocca, Piazza della Scienza, 2, 20126, Milan, Italy.
| | - Maria Elena Regonesi
- Department of Biotechnology and Biosciences, University of Milano-Bicocca, Piazza della Scienza, 2, 20126, Milan, Italy; Milan Center of Neuroscience (NeuroMI), 20126, Milan, Italy
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118
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Shiraishi Y, Ishigami N, Kujiraoka T, Sato A, Fujita M, Ido Y, Adachi T. Deletion of Superoxide Dismutase 1 Blunted Inflammatory Aortic Remodeling in Hypertensive Mice under Angiotensin II Infusion. Antioxidants (Basel) 2021; 10:antiox10030471. [PMID: 33809716 PMCID: PMC8002308 DOI: 10.3390/antiox10030471] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/30/2021] [Revised: 03/11/2021] [Accepted: 03/15/2021] [Indexed: 02/05/2023] Open
Abstract
Superoxide dismutase (SOD) is an enzyme that catalyzes the dismutation of two superoxide anions (O2·−) into hydrogen peroxide (H2O2) and oxygen (O2) and is generally known to protect against oxidative stress. Angiotensin II (AngII) causes vascular hypertrophic remodeling which is associated with H2O2 generation. The aim of this study is to investigate the role of cytosolic SOD (SOD1) in AngII-induced vascular hypertrophy. We employed C57/BL6 mice (WT) and SOD1 deficient mice (SOD1−/−) with the same background. They received a continuous infusion of saline or AngII (3.2 mg/kg/day) for seven days. The blood pressures were equally elevated at 1.5 times with AngII, however, vascular hypertrophy was blunted in SOD1−/− mice compared to WT mice (WT mice 91.9 ± 1.13 µm versus SOD1−/− mice 68.4 ± 1.41 µm p < 0.001). The elevation of aortic interleukin 6 (IL-6) and phosphorylation of pro-inflammatory STAT3 due to AngII were also blunted in SOD1−/− mice’s aortas. In cultured rat vascular smooth muscle cells (VSMCs), reducing expression of SOD1 with siRNA decreased AngII induced IL-6 release as well as phosphorylation of STAT3. Pre-incubation with polyethylene glycol (PEG)-catalase also attenuated phosphorylation of STAT3 due to AngII. These results indicate that SOD1 in VSMCs plays a role in vascular hypertrophy due to increased inflammation caused by AngII, probably via the production of cytosolic H2O2.
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Affiliation(s)
- Yasunaga Shiraishi
- Division of Environmental Medicine, National Defense Medical College Research Institute, 3-2 Namiki, Tokorozawa Saitama 359-8513, Japan;
- Correspondence: ; Tel.: +81-4-2995-1626
| | - Norio Ishigami
- Department of Internal Medicine, Division of Cardiovascular Medicine, National Defense Medical College, 3-2 Namiki, Tokorozawa Saitama 359-8513, Japan; (N.I.); (T.K.); (A.S.); (Y.I.); (T.A.)
| | - Takehiko Kujiraoka
- Department of Internal Medicine, Division of Cardiovascular Medicine, National Defense Medical College, 3-2 Namiki, Tokorozawa Saitama 359-8513, Japan; (N.I.); (T.K.); (A.S.); (Y.I.); (T.A.)
| | - Atsushi Sato
- Department of Internal Medicine, Division of Cardiovascular Medicine, National Defense Medical College, 3-2 Namiki, Tokorozawa Saitama 359-8513, Japan; (N.I.); (T.K.); (A.S.); (Y.I.); (T.A.)
| | - Masanori Fujita
- Division of Environmental Medicine, National Defense Medical College Research Institute, 3-2 Namiki, Tokorozawa Saitama 359-8513, Japan;
| | - Yasuo Ido
- Department of Internal Medicine, Division of Cardiovascular Medicine, National Defense Medical College, 3-2 Namiki, Tokorozawa Saitama 359-8513, Japan; (N.I.); (T.K.); (A.S.); (Y.I.); (T.A.)
| | - Takeshi Adachi
- Department of Internal Medicine, Division of Cardiovascular Medicine, National Defense Medical College, 3-2 Namiki, Tokorozawa Saitama 359-8513, Japan; (N.I.); (T.K.); (A.S.); (Y.I.); (T.A.)
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119
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Guleria S, Jain R, Singh D, Kumar S. A thermostable Fe/Mn SOD of Geobacillus sp. PCH100 isolated from glacial soil of Indian trans-Himalaya exhibits activity in the presence of common inhibitors. Int J Biol Macromol 2021; 179:576-585. [PMID: 33676984 DOI: 10.1016/j.ijbiomac.2021.03.019] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/08/2021] [Revised: 03/02/2021] [Accepted: 03/03/2021] [Indexed: 02/05/2023]
Abstract
Superoxide dismutases are the enzymes involved in dismutation of superoxide radicals into oxygen and hydrogen peroxide. The present work reports a thermostable Fe/Mn SOD of Geobacillus sp. strain PCH100 (GsSOD) isolated from glacial soil. Purified recombinant GsSOD is a dimeric protein of ~57 kDa that exhibited highest activity at a temperature of 10 °C and pH of 7.8. Maximum enzyme velocity and Michaelis constant of the GsSOD were 1098.90 units/mg and 0.62 μM, respectively. At 80 °C, thermal inactivation rate constant and half-life of GsSOD were 3.33 × 10-3 min-1 and 208 min, respectively. Interestingly, GsSOD tolerated a temperature of 100 °C and 130 °C up to 15 min and 5 min, respectively. Circular dichroism and differential scanning calorimetry confirmed thermostable nature of GsSOD. Apoenzyme of GsSOD regained enzymatic activity in the presence of Fe2+ and Mn2+ as metal ion cofactors. GsSOD was stable under varying concentrations of chemicals, namely ethylenediaminetetraacetic acid, potassium cyanide, hydrogen peroxide, chloroform-ethanol, 3-[(3-cholamidopropyl)-dimethylammonio]-1-propanesulfonate, Tween-20, Triton X-100, urea, and guanidine hydrochloride. The enzyme exhibited >70% activity in presence of 10 mM metal ions. Owing to its thermostable nature and resistance to chemical inhibitors, GsSOD is a potential enzyme for industrial applications.
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Affiliation(s)
- Shweta Guleria
- Biotechnology Division, CSIR-Institute of Himalayan Bioresource Technology, Palampur 176061, Himachal Pradesh, India; Department of Biotechnology, Guru Nanak Dev University, Amritsar 143005, Punjab, India
| | - Rahul Jain
- Biotechnology Division, CSIR-Institute of Himalayan Bioresource Technology, Palampur 176061, Himachal Pradesh, India
| | - Dharam Singh
- Biotechnology Division, CSIR-Institute of Himalayan Bioresource Technology, Palampur 176061, Himachal Pradesh, India
| | - Sanjay Kumar
- Biotechnology Division, CSIR-Institute of Himalayan Bioresource Technology, Palampur 176061, Himachal Pradesh, India.
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120
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Wang Q, Pokhrel A, Coleman JJ. The Extracellular Superoxide Dismutase Sod5 From Fusarium oxysporum Is Localized in Response to External Stimuli and Contributes to Fungal Pathogenicity. FRONTIERS IN PLANT SCIENCE 2021; 12:608861. [PMID: 33737941 PMCID: PMC7960929 DOI: 10.3389/fpls.2021.608861] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 09/21/2020] [Accepted: 02/08/2021] [Indexed: 06/12/2023]
Abstract
Reactive oxygen species (ROS) produced by hosts serve as a general defense mechanism against various pathogens. At the interaction site between the host and pathogen, host cells rapidly accumulate high concentrations of ROS, called the oxidative burst, that damage and kill the invading microbes. However, successful pathogens usually survive in a high ROS environment and have evolved strategies to overcome these detrimental effects. Here we characterized the biological function of the extracellular superoxide dismutase (SOD) FoSod5 from Fusarium oxysporum f. sp. vasinfectum. FoSOD5 is strongly up-regulated during infection of cotton, and a ΔFoSOD5 mutant was significantly reduced in virulence on cotton. Purified 6 × His-FoSod5 could significantly inhibit the reduction of NBT and WST-1, indicating that FoSod5 was a functional SOD protein. Based on CRISPR/Cas9 technology, several different FoSod5 variants were generated and used to assess the secretion, expression, and subcellular localization of FoSod5 in F. oxysporum. The subcellular localization of FoSod5 is altered under different environmental conditions. During normal growth conditions, FoSod5 was primarily localized to the phialides; however, in a nutrient-limited environment, FoSod5 was localized to a wide array of fungal structures including the septum and cell wall. FoSod5 is an alkaline-induced glycosylphosphatidylinositol (GPI) protein and the GPI anchor was required for proper protein subcellular localization. The multiple mechanisms fungi utilize to tolerate the oxidative burst is indicative of the importance of this plant defense response; however, the presence of a conserved extracellular SOD in many phytopathogenic fungi suggests tolerance to ROS is initiated prior to the ROS entering the fungal cell.
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121
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Retnoningrum DS, Yoshida H, Razani MD, Meidianto VF, Hartanto A, Artarini A, Ismaya WT. Unprecedented Role of the N73-F124 Pair in the Staphylococcus equorum MnSOD Activity. ACTA ACUST UNITED AC 2021. [DOI: 10.2174/1573408016999201027212952] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
Background:
Bacterial manganese superoxide dismutase (MnSOD) occurs as a dimer,
which is responsible for its activity and stability. Therefore, increasing the dimeric strength would increase
the stability of the enzyme while maintaining its activity.
Objective:
An N73F substitution was introduced to strengthen interactions between the monomers at
the dimer interface. This substitution would introduce a π-stacking interaction between F73 of one
monomer to F124 from the other monomers.
Methods:
Site-directed mutagenesis was carried out to substitute N73 with phenylalanine. The activity
of the mutant was qualitative- and quantitatively checked while the stability was evaluated with a fluorescence-
based thermal-shift assay. Finally, the structure of the mutant was elucidated by means of Xray
crystallography.
Results:
The N73F mutant activity was only ~40% of the wild type. The N73F mutant showed one TM
at 60+1°C while the wild type has two (at 52-55°C and 63-67°C). The crystal structure of the mutant
showed the interactions between F73 from one monomer to F124 from the other monomer. The N73F
structure presents an enigma because of no change in the enzyme structure including the active site.
Furthermore, N73 and F124 position and interaction are conserved in human MnSOD but with a different
location in the amino acid sequence. N73 has a role in the enzyme activity, likely related to its interaction
with F124, which resides in the active site region but has not been considered to participate in
the reaction.
Conclusion:
The N73F substitution has revealed the unprecedented role of the N73-F124 pair in the
enzyme activity.
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Affiliation(s)
- Debbie S. Retnoningrum
- Laboratory of Pharmaceutical Biotechnology, School of Pharmacy, Institut Teknologi Bandung, Bandung, Indonesia
| | - Hiromi Yoshida
- Life Science Research Center and Faculty of Medicine, Kagawa University, Kagawa, Japan
| | - Muthia D. Razani
- Laboratory of Pharmaceutical Biotechnology, School of Pharmacy, Institut Teknologi Bandung, Bandung, Indonesia
| | | | - Andrian Hartanto
- Laboratory of Pharmaceutical Biotechnology, School of Pharmacy, Institut Teknologi Bandung, Bandung, Indonesia
| | - Anita Artarini
- Laboratory of Pharmaceutical Biotechnology, School of Pharmacy, Institut Teknologi Bandung, Bandung, Indonesia
| | - Wangsa T. Ismaya
- Dexa Laboratories of Biomolecular Sciences, Dexa Medica, Cikarang, Indonesia
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122
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Furukawa Y. Good and Bad of Cu/Zn-Superoxide Dismutase Controlled by Metal Ions and Disulfide Bonds. CHEM LETT 2021. [DOI: 10.1246/cl.200770] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/10/2023]
Affiliation(s)
- Yoshiaki Furukawa
- Department of Chemistry, Keio University, 3-14-1 Hiyoshi, Kohoku, Kanagawa 223-8522, Japan
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123
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Kim CH, Kim EJ, Nam YK. Superoxide Dismutase Multigene Family from a Primitive Chondrostean Sturgeon, Acipenser baerii: Molecular Characterization, Evolution, and Antioxidant Defense during Development and Pathogen Infection. Antioxidants (Basel) 2021; 10:232. [PMID: 33546486 PMCID: PMC7913737 DOI: 10.3390/antiox10020232] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/08/2021] [Revised: 01/29/2021] [Accepted: 02/01/2021] [Indexed: 12/16/2022] Open
Abstract
Three distinct superoxide dismutases (SODs)-copper/zinc-SOD (SOD1), manganese-SOD (SOD2), and extracellular copper/zinc-SOD (SOD3)-were identified from a primitive chondrostean fish, Acipenser baerii, enabling the comparison of their transcriptional regulation patterns during development, prelarval ontogeny, and immune stimulation. Each A. baerii SOD isoform (AbSOD) shared conserved structural features with its vertebrate orthologs; however, phylogenetic analyses hypothesized a different evolutionary history for AbSOD3 relative to AbSOD1 and AbSOD2 in the vertebrate lineage. The AbSOD isoforms showed different tissue distribution patterns; AbSOD1 was predominantly expressed in most tissues. The expression of the AbSOD isoforms showed isoform-dependent dynamic modulation according to embryonic development and prelarval ontogenic behaviors. Prelarval microinjections revealed that lipopolysaccharide only induced AbSOD3 expression, while Aeromonas hydrophila induced the expression of AbSOD2 and AbSOD3. In fingerlings, the transcriptional response of each AbSOD isoform to bacterial infection was highly tissue-specific, and the three isoforms exhibited different response patterns within a given tissue type; AbSOD3 was induced the most sensitively, and its induction was the most pronounced in the kidneys and skin. Collectively, these findings suggest isoform-dependent roles for the multigene SOD family in antioxidant defenses against the oxidative stress associated with development and immune responses in these endangered sturgeon fish.
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Affiliation(s)
| | | | - Yoon Kwon Nam
- Department of Marine Bio-Materials and Aquaculture, College of Fisheries Sciences, Pukyong National University, 45 Yongso-ro, Nam-gu, Busan 48513, Korea; (C.-H.K.); (E.J.K.)
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124
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Bandeira Junior G, Baldisserotto B. Fish infections associated with the genus Aeromonas: a review of the effects on oxidative status. J Appl Microbiol 2021; 131:1083-1101. [PMID: 33382188 DOI: 10.1111/jam.14986] [Citation(s) in RCA: 13] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/01/2020] [Revised: 12/14/2020] [Accepted: 12/27/2020] [Indexed: 01/07/2023]
Abstract
The aim of this review was to summarize the current knowledge regarding the effects of aeromonosis on fish oxidative status. The bibliographic survey was carried out on the research platforms: Scopus and Science Direct. The keywords 'Aeromonas', 'fish' and 'oxidative status' (or 'oxidative stress', 'oxidative damage' and similar terms) were used. Scientific papers and short communications were considered. Studies involving fish aeromonosis and enzymatic or non-enzymatic markers of oxidative status were selected. The results of antioxidant enzymes activities/expressions after infection lack consistency, suggesting that these findings should be interpreted with caution. Most of the analysed studies pointed to an increase in reactive oxygen species, malondialdehyde and protein carbonylation levels, indicating possible oxidative damage caused by the infection. Thus, these three biomarkers are excellent indicators of oxidative stress during infection. Regarding respiratory burst activity, several studies have indicated increased activity, but other studies have indicated unchanged activity after infection. Nitric oxide levels also increased after infection in most studies. Therefore, it is suggested that the fish's immune system tries to fight a bacterial infection by releasing reactive oxygen and nitrogen species.
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Affiliation(s)
- G Bandeira Junior
- Department of Physiology and Pharmacology, Federal University of Santa Maria, Santa Maria, RS, Brazil
| | - B Baldisserotto
- Department of Physiology and Pharmacology, Federal University of Santa Maria, Santa Maria, RS, Brazil
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125
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Jing H, Liu H, Lu Z, liuqing, C, Tan X. Mitophagy Improves Ethanol Tolerance in Yeast: Regulation by Mitochondrial Reactive Oxygen Species in Saccharomyces cerevisiae. J Microbiol Biotechnol 2020; 30:1876-1884. [PMID: 33046676 PMCID: PMC9728279 DOI: 10.4014/jmb.2004.04073] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/19/2020] [Revised: 09/08/2020] [Accepted: 09/22/2020] [Indexed: 12/15/2022]
Abstract
Ethanol often accumulates during the process of wine fermentation, and mitophagy has critical role in ethanol output. However, the relationship between mitophagy and ethanol stress is still unclear. In this study, the expression of ATG11 and ATG32 genes exposed to ethanol stress was accessed by real-time quantitative reverse transcription polymerase chain reaction (qRT-PCR). The result indicated that ethanol stress induced expression of the ATG11 and ATG32 genes. The colony sizes and the alcohol yield of atg11 and atg32 were also smaller and lower than those of wild type strain under ethanol whereas the mortality of mutants is higher. Furthermore, compared with wild type, the membrane integrity and the mitochondrial membrane potential of atg11 and atg32 exhibited greater damage following ethanol stress. In addition, a greater proportion of mutant cells were arrested at the G1/G0 cell cycle. There was more aggregation of peroxide hydrogen (H2O2) and superoxide anion (O2•-) in mutants. These changes in H2O2 and O2•- in yeasts were altered by reductants or inhibitors of scavenging enzyme by means of regulating the expression of ATG11 and ATG32 genes. Inhibitors of the mitochondrial electron transport chain (mtETC) also increased production of H2O2 and O2•- by enhancing expression of the ATG11 and ATG32 genes. Further results showed that activator or inhibitor of autophagy also activated or inhibited mitophagy by altering production of H2O2 and O2•. Therefore, ethanol stress induces mitophagy which improves yeast the tolerance to ethanol and the level of mitophagy during ethanol stress is regulated by ROS derived from mtETC.
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Affiliation(s)
- Hongjuan Jing
- College of Biological Engineering, Henan University of Technology, Zhengzhou 450001, P.R. China,Corresponding authors H.Jing Phone: +86-371-67756513 E-mail:
| | - Huanhuan Liu
- College of Biological Engineering, Henan University of Technology, Zhengzhou 450001, P.R. China
| | - Zhang Lu
- College of Biological Engineering, Henan University of Technology, Zhengzhou 450001, P.R. China
| | - Cui liuqing,
- College of Biological Engineering, Henan University of Technology, Zhengzhou 450001, P.R. China
| | - Xiaorong Tan
- College of Biological Engineering, Henan University of Technology, Zhengzhou 450001, P.R. China,X.Tan Phone: +86-371-67756513 E-mail:
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Ngoua Meye Misso RL, Nsole Biteghe FA, Obiang CS, Ondo JP, Gao N, Cervantes-Cervantes M, Vignaux G, Vergeade A, Engohang-Ndong J, Mendene HE, Mabika B, Abessolo FO, Obame Engonga LC, De La Croix Ndong J. Effect of aqueous extracts of Ficus vogeliana Miq and Tieghemella africana Pierre in 7,12-Dimethylbenz(a)anthracene -induced skin cancer in rats. JOURNAL OF ETHNOPHARMACOLOGY 2020; 263:113244. [PMID: 32800931 DOI: 10.1016/j.jep.2020.113244] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/31/2020] [Revised: 08/01/2020] [Accepted: 08/03/2020] [Indexed: 06/11/2023]
Abstract
ETHNOPHARMACOLOGICAL RELEVANCE Skin cancer is the most common form of cancer responsible for considerable morbidity and mortality. Tieghemella africana and Ficus vogeliana are used in traditional medicine to treat cancers. AIM OF THE STUDY Therefore, the aim of this study was to investigate the antioxidant, antiangiogenic and anti-tumor activities of these plant extracts. MATERIALS AND METHODS To achieve it, phytochemical screening, antioxidant activity and antiangiogenic activity were assessed. Thereafter, the anti-tumor activity was determined using skin tumorigenesis induced by 7,12-dimethylbenz[a]anthracene. RESULTS The phytochemical result analysis showed that both plant extracts were rich in polyphenols, alkaloids and terpene compounds and possessed good antioxidant activity based on DPPH radical scavenging (IC50 = 9.70 μg/mL and 4.60 μg/mL and AAI values of 5.20 and 10.88) and strong total antioxidant capacity (115.44 VtCE (mg)/g of dry plant extract and 87.37 VtCE (mg)/g of dry plant extract, respectively). Additionally, both plant extracts possessed antiangiogenic activities (IC50 = 53.43 μg/mL and 92.68 μg/mL, respectively), which correlated with significant antitumor activities when using 35 mg/kg (65.02% and 77.54%) and 70 mg/kg of extracts (81.07% and 88.18%). CONCLUSIONS In summary, this study illustrates the promising usage of Tieghemella africana and Ficus vogeliana plant extracts in treating skin cancer. However, further characterization of the extracts must be performed to isolate the most active anticancer compound.
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Affiliation(s)
| | - Fleury Augustin Nsole Biteghe
- Department of Radiation Oncology and Biomedical Sciences, Cedars-Sinai Medical, 8700, Beverly Blvd, Los Angeles, USA
| | - Cédric Sima Obiang
- Universite des Sciences et Techniques de Masuku (USTM), Department of Chemistry, Franceville, Gabon
| | - Joseph-Privat Ondo
- Universite des Sciences et Techniques de Masuku (USTM), Department of Chemistry, Franceville, Gabon
| | - Nan Gao
- Rutgers University School of Arts & Sciences, Federated Departments of Biological Sciences, Newark, NJ, USA
| | - Miguel Cervantes-Cervantes
- Rutgers University School of Arts & Sciences, Federated Departments of Biological Sciences, Newark, NJ, USA
| | | | | | | | - Hugue Ella Mendene
- Université des Sciences de La Santé, Département de Chimie et Biochimie, Libreville, Gabon
| | - Barthelemy Mabika
- Université des Sciences de La Santé, Département D'Anatomie Pathologie, Libreville, Gabon
| | - Félix Ovono Abessolo
- Université des Sciences de La Santé, Département de Chimie et Biochimie, Libreville, Gabon
| | | | - Jean De La Croix Ndong
- Arctic Slope Regional Corporation Federal, Arlington, VA, USA; New York University, School of Medicine, Department of Orthopedic Surgery, New York, USA
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Abstract
Significance: Oxidative stress in moderation positively affects homeostasis through signaling, while in excess it is associated with adverse health outcomes. Both activities are generally attributed to reactive oxygen species (ROS); hydrogen peroxide as the signal, and cysteines on regulatory proteins as the target. However, using antioxidants to affect signaling or benefit health has not consistently translated into expected outcomes, or when it does, the mechanism is often unclear. Recent Advances: Reactive sulfur species (RSS) were integral in the origin of life and throughout much of evolution. Sophisticated metabolic pathways that evolved to regulate RSS were easily "tweaked" to deal with ROS due to the remarkable similarities between the two. However, unlike ROS, RSS are stored, recycled, and chemically more versatile. Despite these observations, the relevance and regulatory functions of RSS in extant organisms are generally underappreciated. Critical Issues: A number of factors bias observations in favor of ROS over RSS. Research conducted in room air is hyperoxic to cells, and promotes ROS production and RSS oxidation. Metabolic rates of rodent models greatly exceed those of humans; does this favor ROS? Analytical methods designed to detect ROS also respond to RSS. Do these disguise the contributions of RSS? Future Directions: Resolving the ROS/RSS issue is vital to understand biology in general and human health in particular. Improvements in experimental design and analytical methods are crucial. Perhaps the most important is an appreciation of all the attributes of RSS and keeping an open mind.
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Affiliation(s)
- Kenneth R Olson
- Department of Physiology, Indiana University School of Medicine-South Bend, South Bend, Indiana, USA
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128
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Lyall R, Nikoloski Z, Gechev T. Comparative Analysis of ROS Network Genes in Extremophile Eukaryotes. Int J Mol Sci 2020; 21:E9131. [PMID: 33266251 PMCID: PMC7730656 DOI: 10.3390/ijms21239131] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/28/2020] [Revised: 11/27/2020] [Accepted: 11/29/2020] [Indexed: 12/12/2022] Open
Abstract
The reactive oxygen species (ROS) gene network, consisting of both ROS-generating and detoxifying enzymes, adjusts ROS levels in response to various stimuli. We performed a cross-kingdom comparison of ROS gene networks to investigate how they have evolved across all Eukaryotes, including protists, fungi, plants and animals. We included the genomes of 16 extremotolerant Eukaryotes to gain insight into ROS gene evolution in organisms that experience extreme stress conditions. Our analysis focused on ROS genes found in all Eukaryotes (such as catalases, superoxide dismutases, glutathione reductases, peroxidases and glutathione peroxidase/peroxiredoxins) as well as those specific to certain groups, such as ascorbate peroxidases, dehydroascorbate/monodehydroascorbate reductases in plants and other photosynthetic organisms. ROS-producing NADPH oxidases (NOX) were found in most multicellular organisms, although several NOX-like genes were identified in unicellular or filamentous species. However, despite the extreme conditions experienced by extremophile species, we found no evidence for expansion of ROS-related gene families in these species compared to other Eukaryotes. Tardigrades and rotifers do show ROS gene expansions that could be related to their extreme lifestyles, although a high rate of lineage-specific horizontal gene transfer events, coupled with recent tetraploidy in rotifers, could explain this observation. This suggests that the basal Eukaryotic ROS scavenging systems are sufficient to maintain ROS homeostasis even under the most extreme conditions.
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Affiliation(s)
- Rafe Lyall
- Department Bioinformatics and Mathematical Modelling, Center of Plant Systems Biology and Biotechnology, 139 Ruski Blvd., 4000 Plovdiv, Bulgaria; (Z.N.); (T.G.)
| | - Zoran Nikoloski
- Department Bioinformatics and Mathematical Modelling, Center of Plant Systems Biology and Biotechnology, 139 Ruski Blvd., 4000 Plovdiv, Bulgaria; (Z.N.); (T.G.)
- Bioinformatics, Institute of Biochemistry and Biology, University of Potsdam, Karl-Liebknecht-Str. 24-25, 14476 Potsdam-Golm, Germany
- Systems Biology and Mathematical Modelling Group, Max Planck Institute of Molecular Plant Physiology, Am Mühlenberg 1, 14476 Potsdam-Golm, Germany
| | - Tsanko Gechev
- Department Bioinformatics and Mathematical Modelling, Center of Plant Systems Biology and Biotechnology, 139 Ruski Blvd., 4000 Plovdiv, Bulgaria; (Z.N.); (T.G.)
- Department of Plant Physiology and Molecular Biology, Plovdiv University, 24 Tsar Assen str., 4000 Plovdiv, Bulgaria
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129
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Farghaly FA, Radi AA, Al-Kahtany FA, Hamada AM. Impacts of zinc oxide nano and bulk particles on redox-enzymes of the Punica granatum callus. Sci Rep 2020; 10:19722. [PMID: 33184350 PMCID: PMC7665012 DOI: 10.1038/s41598-020-76664-4] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/13/2020] [Accepted: 10/28/2020] [Indexed: 01/24/2023] Open
Abstract
The structure and function of cellular membranes were sustained by redox-enzymes. We studied the interaction between the oxidative stress caused by excessive accumulation of ZnO-nanoparticles (ZnO-NPs) in plants and the role of redox-enzymes that can alleviate this stress. The crude callus extract from pomegranate, which was treated with 0, 10, and 150 µg mL-1 ZnO-NPs or bulk particles (ZnO-BPs), was applied to study the activity and kinetics of redox-enzymes. The elevated ZnO-NPs, enhanced the lipoxygenase and polyphenol oxidase activity, while the ZnO-BPs did not modify them. The activities of superoxide dismutase, catalase, and phenylalanine ammonia-lyase were induced under ZnO-NPs or BPs treatments, whilst the opposite trend of peroxidase was observed. Ascorbate peroxidase activity increased under ZnO-NPs treatments but decreased under ZnO-BPs. The kinetics activity of enzymes showed changes under different levels of NPs and BPs. Additionally, NPs or BPs treatments reduced the uptake of copper, iron, magnesium, but increased zinc accumulation in callus tissues. Meanwhile, these treatments enhanced the accumulation of manganese ions but did not affect the accumulation of potassium and phosphorous in ZnO-NPs or BPs-stressed calli. Collectively, these results gave a quantitative evaluation of the competition of zinc and other minerals on the carriers, and in addition, they provided a basis for how to control ZnO-NPs or BPs toxicity via redox-enzymes.
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Affiliation(s)
- Fatma A Farghaly
- Botany and Microbiology Department, Faculty of Science, Assiut University, Assiut, 71516, Egypt
| | - Abeer A Radi
- Botany and Microbiology Department, Faculty of Science, Assiut University, Assiut, 71516, Egypt
| | | | - Afaf M Hamada
- Botany and Microbiology Department, Faculty of Science, Assiut University, Assiut, 71516, Egypt.
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130
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Park SJ, Andrei AŞ, Bulzu PA, Kavagutti VS, Ghai R, Mosier AC. Expanded Diversity and Metabolic Versatility of Marine Nitrite-Oxidizing Bacteria Revealed by Cultivation- and Genomics-Based Approaches. Appl Environ Microbiol 2020; 86:e01667-20. [PMID: 32917751 PMCID: PMC7642081 DOI: 10.1128/aem.01667-20] [Citation(s) in RCA: 30] [Impact Index Per Article: 7.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/09/2020] [Accepted: 09/03/2020] [Indexed: 12/30/2022] Open
Abstract
Nitrite-oxidizing bacteria (NOB) are ubiquitous and abundant microorganisms that play key roles in global nitrogen and carbon biogeochemical cycling. Despite recent advances in understanding NOB physiology and taxonomy, currently very few cultured NOB or representative NOB genome sequences from marine environments exist. In this study, we employed enrichment culturing and genomic approaches to shed light on the phylogeny and metabolic capacity of marine NOB. We successfully enriched two marine NOB (designated MSP and DJ) and obtained a high-quality metagenome-assembled genome (MAG) from each organism. The maximum nitrite oxidation rates of the MSP and DJ enrichment cultures were 13.8 and 30.0 μM nitrite per day, respectively, with these optimum rates occurring at 0.1 mM and 0.3 mM nitrite, respectively. Each enrichment culture exhibited a different tolerance to various nitrite and salt concentrations. Based on phylogenomic position and overall genome relatedness indices, both NOB MAGs were proposed as novel taxa within the Nitrospinota and Nitrospirota phyla. Functional predictions indicated that both NOB MAGs shared many highly conserved metabolic features with other NOB. Both NOB MAGs encoded proteins for hydrogen and organic compound metabolism and defense mechanisms for oxidative stress. Additionally, these organisms may have the genetic potential to produce cobalamin (an essential enzyme cofactor that is limiting in many environments) and, thus, may play an important role in recycling cobalamin in marine sediment. Overall, this study appreciably expands our understanding of the Nitrospinota and Nitrospirota phyla and suggests that these NOB play important biogeochemical roles in marine habitats.IMPORTANCE Nitrification is a key process in the biogeochemical and global nitrogen cycle. Nitrite-oxidizing bacteria (NOB) perform the second step of aerobic nitrification (converting nitrite to nitrate), which is critical for transferring nitrogen to other organisms for assimilation or energy. Despite their ecological importance, there are few cultured or genomic representatives from marine systems. Here, we obtained two NOB (designated MSP and DJ) enriched from marine sediments and estimated the physiological and genomic traits of these marine microbes. Both NOB enrichment cultures exhibit distinct responses to various nitrite and salt concentrations. Genomic analyses suggest that these NOB are metabolically flexible (similar to other previously described NOB) yet also have individual genomic differences that likely support distinct niche distribution. In conclusion, this study provides more insights into the ecological roles of NOB in marine environments.
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Affiliation(s)
- Soo-Je Park
- Department of Biology, Jeju National University, Jeju, Republic of Korea
| | - Adrian-Ştefan Andrei
- Department of Aquatic Microbial Ecology, Institute of Hydrobiology, Biology Centre of the Academy of Sciences of the Czech Republic, České Budějovice, Czech Republic
| | - Paul-Adrian Bulzu
- Department of Aquatic Microbial Ecology, Institute of Hydrobiology, Biology Centre of the Academy of Sciences of the Czech Republic, České Budějovice, Czech Republic
| | - Vinicius S Kavagutti
- Department of Aquatic Microbial Ecology, Institute of Hydrobiology, Biology Centre of the Academy of Sciences of the Czech Republic, České Budějovice, Czech Republic
- Department of Ecosystem Biology, Faculty of Science, University of South Bohemia, České Budějovice, Czech Republic
| | - Rohit Ghai
- Department of Aquatic Microbial Ecology, Institute of Hydrobiology, Biology Centre of the Academy of Sciences of the Czech Republic, České Budějovice, Czech Republic
| | - Annika C Mosier
- Department of Integrative Biology, University of Colorado Denver, Denver, Colorado, USA
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131
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Chovanová K, Böhmer M, Poljovka A, Budiš J, Harichová J, Szemeš T, Zámocký M. Parallel Molecular Evolution of Catalases and Superoxide Dismutases-Focus on Thermophilic Fungal Genomes. Antioxidants (Basel) 2020; 9:antiox9111047. [PMID: 33120873 PMCID: PMC7712995 DOI: 10.3390/antiox9111047] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/24/2020] [Revised: 10/21/2020] [Accepted: 10/22/2020] [Indexed: 12/17/2022] Open
Abstract
Catalases (CAT) and superoxide dismutases (SOD) represent two main groups of enzymatic antioxidants that are present in almost all aerobic organisms and even in certain anaerobes. They are closely interconnected in the catabolism of reactive oxygen species because one product of SOD reaction (hydrogen peroxide) is the main substrate of CAT reaction finally leading to harmless products (i.e., molecular oxygen and water). It is therefore interesting to compare the molecular evolution of corresponding gene families. We have used a phylogenomic approach to elucidate the evolutionary relationships among these two main enzymatic antioxidants with a focus on the genomes of thermophilic fungi. Distinct gene families coding for CuZnSODs, FeMnSODs, and heme catalases are very abundant in thermophilic Ascomycota. Here, the presented results demonstrate that whereas superoxide dismutase genes remained rather constant during long-term evolution, the total count of heme catalase genes was reduced in thermophilic fungi in comparison with their mesophilic counterparts. We demonstrate here, for the newly discovered ascomycetous genes coding for thermophilic superoxide dismutases and catalases (originating from our sequencing project), the expression patterns of corresponding mRNA transcripts and further analyze translated protein sequences. Our results provide important implications for the physiology of reactive oxygen species metabolism in eukaryotic cells at elevated temperatures.
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Affiliation(s)
- Katarína Chovanová
- Laboratory for Phylogenomic Ecology, Institute of Molecular Biology, Slovak Academy of Sciences, Dúbravska cesta 21, SK-84551 Bratislava, Slovakia; (K.C.); (A.P.); (J.H.)
| | - Miroslav Böhmer
- Department of Molecular Biology, Faculty of Nat. Sciences, Science Park of Comenius University, Comenius University, Ilkovičova 8, SK-84104 Bratislava, Slovakia; (M.B.); (J.B.); (T.S.)
| | - Andrej Poljovka
- Laboratory for Phylogenomic Ecology, Institute of Molecular Biology, Slovak Academy of Sciences, Dúbravska cesta 21, SK-84551 Bratislava, Slovakia; (K.C.); (A.P.); (J.H.)
| | - Jaroslav Budiš
- Department of Molecular Biology, Faculty of Nat. Sciences, Science Park of Comenius University, Comenius University, Ilkovičova 8, SK-84104 Bratislava, Slovakia; (M.B.); (J.B.); (T.S.)
| | - Jana Harichová
- Laboratory for Phylogenomic Ecology, Institute of Molecular Biology, Slovak Academy of Sciences, Dúbravska cesta 21, SK-84551 Bratislava, Slovakia; (K.C.); (A.P.); (J.H.)
| | - Tomáš Szemeš
- Department of Molecular Biology, Faculty of Nat. Sciences, Science Park of Comenius University, Comenius University, Ilkovičova 8, SK-84104 Bratislava, Slovakia; (M.B.); (J.B.); (T.S.)
| | - Marcel Zámocký
- Laboratory for Phylogenomic Ecology, Institute of Molecular Biology, Slovak Academy of Sciences, Dúbravska cesta 21, SK-84551 Bratislava, Slovakia; (K.C.); (A.P.); (J.H.)
- Department of Chemistry, Institute of Biochemistry, BOKU, University of Natural Resources and Life Sciences, Muthgasse 18, A-1190 Vienna, Austria
- Correspondence:
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132
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Zheng P, Chen L, Zhong S, Wei X, Zhao Q, Pan Q, Kang Z, Liu J. A Cu-only superoxide dismutase from stripe rust fungi functions as a virulence factor deployed for counter defense against host-derived oxidative stress. Environ Microbiol 2020; 22:5309-5326. [PMID: 32985748 DOI: 10.1111/1462-2920.15236] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/11/2020] [Revised: 09/10/2020] [Accepted: 09/13/2020] [Indexed: 12/13/2022]
Abstract
Plants quickly accumulate reactive oxygen species (ROS) to resist against pathogen invasion, while pathogens strive to escape host immune surveillance by degrading ROS. However, the nature of the strategies that fungal pathogens adopt to counteract host-derived oxidative stress is manifold and requires deep investigation. In this study, a superoxide dismutase (SOD) from Puccinia striiformis f. sp. tritici (Pst) PsSOD2 with a signal peptide (SP) and the glycophosphatidyl inositol (GPI) anchor, strongly induced during infection, was analysed for its biological characteristics and potential role in wheat-Pst interactions. The results showed that PsSOD2 encodes a Cu-only SOD and responded to ROS treatment. Heterologous complementation assays in Saccharomyces cerevisiae suggest that the SP of PsSOD2 is functional for its secretion. Transient expression in Nicotiana benthamiana leaves revealed that PsSOD2 is localized to the plasma membrane. In addition, knockdown of PsSOD2 by host-induced gene silencing reduced Pst virulence and resulted in restricted hyphal development and increased ROS accumulation. In contrast, heterologous transient assays of PsSOD2 suppressed flg22-elicited ROS production. Taken together, our data indicate that PsSOD2, as a virulence factor, was induced and localized to the plasma membrane where it may function to scavenge host-derived ROS for promoting fungal infection.
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Affiliation(s)
- Peijing Zheng
- State Key Laboratory of Crop Stress Biology for Arid Areas and College of Life Sciences, Northwest A&F University, Yangling, Shaanxi, 712100, China
| | - Liyang Chen
- State Key Laboratory of Crop Stress Biology for Arid Areas and College of Life Sciences, Northwest A&F University, Yangling, Shaanxi, 712100, China
| | - Suye Zhong
- State Key Laboratory of Crop Stress Biology for Arid Areas and College of Life Sciences, Northwest A&F University, Yangling, Shaanxi, 712100, China
| | - Xiaobo Wei
- State Key Laboratory of Crop Stress Biology for Arid Areas and College of Life Sciences, Northwest A&F University, Yangling, Shaanxi, 712100, China
| | - Qi Zhao
- State Key Laboratory of Crop Stress Biology for Arid Areas and College of Science, Northwest A&F University, Yangling, Shaanxi, 712100, China
| | - Qinglin Pan
- State Key Laboratory of Crop Stress Biology for Arid Areas and College of Plant Protection, Northwest A&F University, Yangling, Shaanxi, 712100, China
| | - Zhensheng Kang
- State Key Laboratory of Crop Stress Biology for Arid Areas and College of Plant Protection, Northwest A&F University, Yangling, Shaanxi, 712100, China.,College of Plant Scicence, Tarim University, Alaer, Xinjiang, 843300, China
| | - Jie Liu
- State Key Laboratory of Crop Stress Biology for Arid Areas and College of Life Sciences, Northwest A&F University, Yangling, Shaanxi, 712100, China
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The recA gene is crucial to mediate colonization of Bacillus cereus 905 on wheat roots. Appl Microbiol Biotechnol 2020; 104:9251-9265. [PMID: 32970180 DOI: 10.1007/s00253-020-10915-2] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/29/2020] [Revised: 09/07/2020] [Accepted: 09/17/2020] [Indexed: 10/23/2022]
Abstract
Bacillus cereus 905, one of the plant growth-promoting rhizobacteria (PGPRs), is capable of colonizing wheat roots in a large population size. From previous studies, we learned that the sodA2-encoding manganese-containing superoxide dismutase (MnSOD2) is important for B. cereus 905 to survive in wheat rhizosphere. In this investigation, we demonstrated that deletion of the recA gene, which codes for the recombinase A, significantly reduced MnSOD2 expression at both the mRNA and the protein levels. Through comparison with the wild-type, the ∆recA showed a dramatic decrease in cell survival after exposure to 50 μM paraquat or 15 mM H2O2. Evidence indicated that the recA gene of B. cereus 905 also notably regulated nutrition utilization efficiency, biofilm formation, and swarming motility. The root colonization examination showed that the ∆recA had a 1000- to 2500-fold reduction in colonization on wheat roots, suggesting that RecA plays an indispensable role in effective colonization on wheat roots by B. cereus 905. Taken together, the recA gene positively regulates MnSOD2 production and nutrition utilization and protects B. cereus 905 cells against paraquat and H2O2. Besides, biofilm formation and swarming motility of B. cereus 905 are promoted by RecA. Finally, RecA significantly contributes to wheat root colonization of B. cereus 905. Our results showed the important role of RecA during physiological processes in B. cereus 905, especially for colonization on wheat roots. Our findings will point out a research direction to study the colonization mechanisms of B. cereus 905 in the future and provide potential effective strategy to enhance the biocontrol efficacy of PGPR strains. KEY POINTS : • RecA plays an indispensable role in root colonization of B. cereus.
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134
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Francolini I, Piozzi A. Role of Antioxidant Molecules and Polymers in Prevention of Bacterial Growth and Biofilm Formation. Curr Med Chem 2020; 27:4882-4904. [DOI: 10.2174/0929867326666190409120409] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/14/2018] [Revised: 03/27/2019] [Accepted: 04/04/2019] [Indexed: 01/22/2023]
Abstract
Background:
Antioxidants are multifaceted molecules playing a crucial role in several
cellular functions. There is by now a well-established knowledge about their involvement in numerous
processes associated with aging, including vascular damage, neurodegenerative diseases and
cancer. An emerging area of application has been lately identified for these compounds in relation to
the recent findings indicating their ability to affect biofilm formation by some microbial pathogens,
including Staphylococcus aureus, Streptococcus mutans, and Pseudomonas aeruginosa.
Methods:
A structured search of bibliographic databases for peer-reviewed research literature was
performed using a focused review question. The quality of retrieved papers was appraised using
standard tools.
Results:
One hundred sixty-five papers extracted from pubmed database and published in the last
fifteen years were included in this review focused on the assessment of the antimicrobial and antibiofilm
activity of antioxidant compounds, including vitamins, flavonoids, non-flavonoid polyphenols,
and antioxidant polymers. Mechanisms of action of some important antioxidant compounds,
especially for vitamin C and phenolic acids, were identified.
Conclusion:
The findings of this review confirm the potential benefits of the use of natural antioxidants
as antimicrobial/antibiofilm compounds. Generally, gram-positive bacteria were found to be
more sensitive to antioxidants than gram-negatives. Antioxidant polymeric systems have also been
developed mainly derived from functionalization of polysaccharides with antioxidant molecules.
The application of such systems in clinics may permit to overcome some issues related to the systemic
delivery of antioxidants, such as poor absorption, loss of bioactivity, and limited half-life.
However, investigations focused on the study of antibiofilm activity of antioxidant polymers are still
very limited in number and therefore they are strongly encouraged in order to lay the foundations for
application of antioxidant polymers in treatment of biofilm-based infections.
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Affiliation(s)
- Iolanda Francolini
- Department of Chemistry, Sapienza University of Rome, P.le A. Moro, 5 - 00185, Rome, Italy
| | - Antonella Piozzi
- Department of Chemistry, Sapienza University of Rome, P.le A. Moro, 5 - 00185, Rome, Italy
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135
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Purification, biochemical characterization and DNA protection against oxidative damage of a novel recombinant superoxide dismutase from psychrophilic bacterium Halomonas sp. ANT108. Protein Expr Purif 2020; 173:105661. [DOI: 10.1016/j.pep.2020.105661] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/11/2020] [Revised: 04/26/2020] [Accepted: 04/29/2020] [Indexed: 12/23/2022]
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Han Z, Sun J, Wang A, Lv A, Hu X, Chen L, Guo Y. Differentially expressed proteins in the intestine of Cynoglossus semilaevis Günther following a Shewanella algae challenge. FISH & SHELLFISH IMMUNOLOGY 2020; 104:111-122. [PMID: 32525078 DOI: 10.1016/j.fsi.2020.06.013] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/29/2020] [Revised: 05/31/2020] [Accepted: 06/06/2020] [Indexed: 06/11/2023]
Abstract
Fish intestine is an important constituent of the mucosal immune system. The gut and gut-associated lymphoid tissue construct a local immune environment. A Shewanella algae strain was previously reported to be a pathogen causing ascitic disease accompanied with intestinal inflammation in Cynoglossus semilaevis. This study aimed to investigate the intestine immune response in C. semilaevis to S. algae infection at the protein level. Two-dimensional electrophoresis coupled with mass spectrometry proteomics was utilized to compare protein expression in the intestines from normal and S. algae-infected C. semilaevis. A total of 70 differentially expressed proteins (DEPs), consisting of 16 upregulated and 54 downregulated proteins, were identified in the intestine tissue of C. Semilaevis. These protein expression changes were further validated using western blot analysis and quantitative real-time PCR. Gene ontology enrichment analysis showed that these 70 DEPs could be assigned across three categories: "cellular components", "molecular function", and "biological process". Forty-one DEPs (six up-regulated and 35 down-regulated proteins) related to metabolic processes were identified. In addition, 20 DEPs (eight up-regulated and 12 down-regulated proteins) related to stress and immune responses were identified. A protein-protein interaction network generated by the STRING (Search Tool for the Retrieval of Interacting Genes/protein) revealed that 30 DEPs interacted with one another to form an integrated network. Among them, 29 DEPs were related to stress, immune, and metabolism processes. In the network, some of the immune related proteins (C9, FGB, KNG1, apolipoprotein A-IV-like, and PDIA3) were up-regulated and most DEPs involved in metabolism processes were down-regulated. These results indicate that the immune defense response of the intestine was activated and the intestinal function associated with metabolism processes was disturbed. This study provides valuable information for further research into the functions of these DEPs in fish.
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Affiliation(s)
- Zhuoran Han
- Key Laboratory of Ecology and Environment Science of Higher Education Institutes, Guangdong Provincial Key Laboratory for Healthy and Safe Aquaculture, College of Life Science, South China Normal University, Guangzhou, 510631, China; Tianjin Key Laboratory of Aqua-ecology and Aquaculture, Fisheries College, Tianjin Agricultural University, Tianjin, 300384, China.
| | - Jingfeng Sun
- Tianjin Key Laboratory of Aqua-ecology and Aquaculture, Fisheries College, Tianjin Agricultural University, Tianjin, 300384, China.
| | - Anli Wang
- Key Laboratory of Ecology and Environment Science of Higher Education Institutes, Guangdong Provincial Key Laboratory for Healthy and Safe Aquaculture, College of Life Science, South China Normal University, Guangzhou, 510631, China.
| | - Aijun Lv
- Tianjin Key Laboratory of Aqua-ecology and Aquaculture, Fisheries College, Tianjin Agricultural University, Tianjin, 300384, China.
| | - Xiucai Hu
- Tianjin Key Laboratory of Aqua-ecology and Aquaculture, Fisheries College, Tianjin Agricultural University, Tianjin, 300384, China.
| | - Limei Chen
- Tianjin Key Laboratory of Aqua-ecology and Aquaculture, Fisheries College, Tianjin Agricultural University, Tianjin, 300384, China.
| | - Yongjun Guo
- Tianjin Key Laboratory of Aqua-ecology and Aquaculture, Fisheries College, Tianjin Agricultural University, Tianjin, 300384, China.
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137
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Mayfield JR, Grotemeyer EN, Jackson TA. Concerted proton-electron transfer reactions of manganese-hydroxo and manganese-oxo complexes. Chem Commun (Camb) 2020; 56:9238-9255. [PMID: 32578605 PMCID: PMC7429365 DOI: 10.1039/d0cc01201g] [Citation(s) in RCA: 18] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/21/2023]
Abstract
The enzymes manganese superoxide dismutase and manganese lipoxygenase use MnIII-hydroxo centres to mediate proton-coupled electron transfer (PCET) reactions with substrate. As manganese is earth-abundant and inexpensive, manganese catalysts are of interest for synthetic applications. Recent years have seen exciting reports of enantioselective C-H bond oxidation by Mn catalysts supported by aminopyridyl ligands. Such catalysts offer economic and environmentally-friendly alternatives to conventional reagents and catalysts. Mechanistic studies of synthetic catalysts highlight the role of Mn-oxo motifs in attacking substrate C-H bonds, presumably by a concerted proton-electron transfer (CPET) step. (CPET is a sub-class of PCET, where the proton and electron are transferred in the same step.) Knowledge of geometric and electronic influences for CPET reactions of Mn-hydroxo and Mn-oxo adducts enhances our understanding of biological and synthetic manganese centers and informs the design of new catalysts. In this Feature article, we describe kinetic, spectroscopic, and computational studies of MnIII-hydroxo and MnIV-oxo complexes that provide insight into the basis for the CPET reactivity of these species. Systematic perturbations of the ligand environment around MnIII-hydroxo and MnIV-oxo motifs permit elucidation of structure-activity relationships. For MnIII-hydroxo centers, electron-deficient ligands enhance oxidative reactivity. However, ligand perturbations have competing consequences, as changes in the MnIII/II potential, which represents the electron-transfer component for CPET, is offset by compensating changes in the pKa of the MnII-aqua product, which represents the proton-transfer component for CPET. For MnIV-oxo systems, a multi-state reactivity model inspired the development of significantly more reactive complexes. Weakened equatorial donation to the MnIV-oxo unit results in large rate enhancements for C-H bond oxidation and oxygen-atom transfer reactions. These results demonstrate that the local coordination environment can be rationally changed to enhance reactivity of MnIII-hydroxo and MnIV-oxo adducts.
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Affiliation(s)
- Jaycee R Mayfield
- Department of Chemistry and Center for Environmentally Beneficial Catalysis, University of Kansas, Lawrence, KS 66045, USA.
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Results from the Population-Based Gutenberg Health Study Revealing Four Altered Autoantibodies in Retinal Vein Occlusion Patients. J Ophthalmol 2020; 2020:8386160. [PMID: 32802490 PMCID: PMC7411451 DOI: 10.1155/2020/8386160] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/26/2020] [Accepted: 06/30/2020] [Indexed: 12/22/2022] Open
Abstract
Purpose Retinal vein occlusion (RVO) is the second most common retinal vascular disease and a major cause of visual impairment. In this study, we aimed to observe whether RVO cases have different antibody profiles as a new potential risk factor and whether a conversion of retinal vein occlusion (RVO) to neovascular glaucoma (NVG), one of the major complications, is occurring within a 5-year timeframe. Methods We performed a nested case-control study (1 : 4) within the Gutenberg Health Study (GHS), a population-based, prospective cohort study in the Rhine-Main Region of Germany including 15,010 participants. RVO subjects (n = 59) were identified by grading of fundus photographs. Optic nerves of RVO subjects and age- and sex-matched controls (n = 229) at baseline and their follow-up examination after 5 years were analyzed for glaucomatous alterations. Of all RVO subjects and controls, serum autoantibody profiles were measured using in-house manufactured antigen-antibody microarrays. Results Of the 59 RVO patients, 3 patients (5%) showed glaucomatous optic disc alterations at baseline, whereas no new glaucoma case was detected at 5-year follow-up. Four of the autoantibodies measured (against dermcidin, neurotrophin-3, superoxide dismutase 1, and signal recognition particle 14 kDa protein) were significantly increased in the serum of RVO patients (p < 0.001). Multivariable conditional logistic regression analysis showed that 3 of these 4 antibodies were independent of cardiovascular risk factors. Conclusions We found several autoantibodies associated with RVO, targeting proteins and structures possibly involved in RVO pathogenesis.
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Pedone E, Fiorentino G, Bartolucci S, Limauro D. Enzymatic Antioxidant Signatures in Hyperthermophilic Archaea. Antioxidants (Basel) 2020; 9:antiox9080703. [PMID: 32756530 PMCID: PMC7465337 DOI: 10.3390/antiox9080703] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/06/2020] [Revised: 07/28/2020] [Accepted: 07/31/2020] [Indexed: 12/17/2022] Open
Abstract
To fight reactive oxygen species (ROS) produced by both the metabolism and strongly oxidative habitats, hyperthermophilic archaea are equipped with an array of antioxidant enzymes whose role is to protect the biological macromolecules from oxidative damage. The most common ROS, such as superoxide radical (O2-.) and hydrogen peroxide (H2O2), are scavenged by superoxide dismutase, peroxiredoxins, and catalase. These enzymes, together with thioredoxin, protein disulfide oxidoreductase, and thioredoxin reductase, which are involved in redox homeostasis, represent the core of the antioxidant system. In this review, we offer a panorama of progression of knowledge on the antioxidative system in aerobic or microaerobic (hyper)thermophilic archaea and possible industrial applications of these enzymes.
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Affiliation(s)
- Emilia Pedone
- Istituto di Biostrutture e Bioimmagini, CNR, Via Mezzocannone 16, 80134 Napoli, Italy;
| | - Gabriella Fiorentino
- Dipartimento di Biologia, Università degli Studi di Napoli Federico II, Complesso universitario Monte S. Angelo, Via Cinthia, 80126 Napoli, Italy; (G.F.); (S.B.)
| | - Simonetta Bartolucci
- Dipartimento di Biologia, Università degli Studi di Napoli Federico II, Complesso universitario Monte S. Angelo, Via Cinthia, 80126 Napoli, Italy; (G.F.); (S.B.)
| | - Danila Limauro
- Dipartimento di Biologia, Università degli Studi di Napoli Federico II, Complesso universitario Monte S. Angelo, Via Cinthia, 80126 Napoli, Italy; (G.F.); (S.B.)
- Correspondence:
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140
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Nadarajah KK. ROS Homeostasis in Abiotic Stress Tolerance in Plants. Int J Mol Sci 2020; 21:E5208. [PMID: 32717820 PMCID: PMC7432042 DOI: 10.3390/ijms21155208] [Citation(s) in RCA: 220] [Impact Index Per Article: 55.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/04/2020] [Revised: 06/23/2020] [Accepted: 06/26/2020] [Indexed: 12/21/2022] Open
Abstract
Climate change-induced abiotic stress results in crop yield and production losses. These stresses result in changes at the physiological and molecular level that affect the development and growth of the plant. Reactive oxygen species (ROS) is formed at high levels due to abiotic stress within different organelles, leading to cellular damage. Plants have evolved mechanisms to control the production and scavenging of ROS through enzymatic and non-enzymatic antioxidative processes. However, ROS has a dual function in abiotic stresses where, at high levels, they are toxic to cells while the same molecule can function as a signal transducer that activates a local and systemic plant defense response against stress. The effects, perception, signaling, and activation of ROS and their antioxidative responses are elaborated in this review. This review aims to provide a purview of processes involved in ROS homeostasis in plants and to identify genes that are triggered in response to abiotic-induced oxidative stress. This review articulates the importance of these genes and pathways in understanding the mechanism of resistance in plants and the importance of this information in breeding and genetically developing crops for resistance against abiotic stress in plants.
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Affiliation(s)
- Kalaivani K Nadarajah
- Department of Biological Sciences and Biotechnology, Faculty of Science and Technology, Universiti Kebangsaan Malaysia, 43600 UKM BANGI, Malaysia
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141
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Kwok ML, Chan KM. Oxidative stress and apoptotic effects of copper and cadmium in the zebrafish liver cell line ZFL. Toxicol Rep 2020; 7:822-835. [PMID: 32670800 PMCID: PMC7347715 DOI: 10.1016/j.toxrep.2020.06.012] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/08/2020] [Revised: 05/08/2020] [Accepted: 06/26/2020] [Indexed: 12/11/2022] Open
Abstract
Oxidative stress and apoptosis created by Cu2+ and Cd2+ insults were studied in ZFL. Cu2+ and Cd2+ both created lipid peroxidation, causing oxidative stress in cytoplasm. Mitochondrial superoxide was induced by Cd2+ but supressed by Cu2+. Cu2+ suppressed Casp3 activity, resulting in suppressed the apoptosis. Pre-treatments of low concentration of Cu2+ protected the cell from Cd2+ insults.
Copper (Cu) and cadmium (Cd) are widely used in industrial activities, resulting in Cu and Cd contamination in aquatic systems worldwide. Although Cu plays an essential role in many biological functions, an excessive amount of the metal causes cytotoxicity. In contrast, Cd is a non-essential metal that usually co-exists with Cu. Together, they cause oxidative stress in cells, leading to cell damage. These metal ions are also believed to cause cell apoptosis. In this study, we used a zebrafish liver cell line, ZFL, to study combined Cu and Cd cytotoxicity. Although Cd is more toxic than Cu, both were found to regulate the expression of oxidative stress related genes, and neither significantly altered the activity of oxidative stress related enzymes. Co-exposure tests with the antioxidant N-acetyl-l-cysteine and the Cu chelator bathocuproinedisulfonic acid disodium salt demonstrated that Cd toxicity was due to the oxidative stress caused by Cu, and that Cu at a low concentration could in fact exert an antioxidant effect against the oxidative stress in ZFL. Excessive Cu concentration triggered the expression of initiator caspases (caspase 8 and caspase 9) but suppressed that of an executioner caspase (caspase 3), halting apoptosis. Cd could only trigger the expression of initiator caspases; it could not halt apoptosis. However, a low concentration of Cu reduced the mitochondrial superoxide level, suppressing the Cd-induced apoptotic effects in ZFL.
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Key Words
- BCS, bathocuproinedisulfonic acid disodium salt
- CAT, catalase protein
- Casp3, caspase 3 protein
- Casp8, caspase 8 protein
- Casp9, caspase 9 protein
- Cd, cadmium
- Combined effects
- Cu, copper
- Cytotoxicity
- GR, glutathione reductase protein
- GST, glutathione-S-transferase protein
- LC, lethal concentration
- LC20, lethal concentration of 20 % population
- LC50, median lethal concentration
- Mitochondrial function
- NAC, N-acetyl-l-cysteine
- PBS, phosphate-buffered saline
- SOD, superoxide dismutase proteins
- VE, tocopherol (Vitamin E)
- cat, catalase gene
- ccs, copper chaperone for superoxide dismutase gene
- ef1a, elongation factor 1-alpha gene
- gr, glutathione reductase gene
- gst, glutathione-S-transferase gene
- mtDNA, mitochondrial DNA
- sod1, superoxide dismutase 1 gene
- sod2, superoxide dismutase 2 gene
- ybx1, Y box-binding protein 1 gene
- z, zebrafish
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Affiliation(s)
- Man Long Kwok
- School of Life Sciences, The Chinese University of Hong Kong, Sha Tin, N.T., Hong Kong
| | - King Ming Chan
- School of Life Sciences, The Chinese University of Hong Kong, Sha Tin, N.T., Hong Kong
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Kwok RML, Chan KM. WITHDRAWN: Oxidative Stress and Apoptotic Effects of Copper and Cadmium in the Zebrafish Liver Cell Line ZFL. Toxicol Rep 2020. [DOI: 10.1016/j.toxrep.2020.07.001] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022] Open
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143
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Saccà SC, Vernazza S, Iorio EL, Tirendi S, Bassi AM, Gandolfi S, Izzotti A. Molecular changes in glaucomatous trabecular meshwork. Correlations with retinal ganglion cell death and novel strategies for neuroprotection. PROGRESS IN BRAIN RESEARCH 2020; 256:151-188. [PMID: 32958211 DOI: 10.1016/bs.pbr.2020.06.003] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/10/2023]
Abstract
Glaucoma is a chronic neurodegenerative disease characterized by retinal ganglion cell loss. Although significant advances in ophthalmologic knowledge and practice have been made, some glaucoma mechanisms are not yet understood, therefore, up to now there is no effective treatment able to ensure healing. Indeed, either pharmacological or surgical approaches to this disease aim in lowering intraocular pressure, which is considered the only modifiable risk factor. However, it is well known that several factors and metabolites are equally (if not more) involved in glaucoma. Oxidative stress, for instance, plays a pivotal role in both glaucoma onset and progression because it is responsible for the trabecular meshwork cell damage and, consequently, for intraocular pressure increase as well as for glaucomatous damage cascade. This review at first shows accurately the molecular-derived dysfunctions in antioxidant system and in mitochondria homeostasis which due to both oxidative stress and aging, lead to a chronic inflammation state, the trabecular meshwork damage as well as the glaucoma neurodegeneration. Therefore, the main molecular events triggered by oxidative stress up to the proapoptotic signals that promote the ganglion cell death have been highlighted. The second part of this review, instead, describes some of neuroprotective agents such as polyphenols or polyunsaturated fatty acids as possible therapeutic source against the propagation of glaucomatous damage.
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Affiliation(s)
- Sergio C Saccà
- Policlinico San Martino University Hospital, Department of Neuroscience and sense organs, Ophthalmology Unit, Genoa, Italy.
| | | | | | - Sara Tirendi
- Department of Experimental Medicine (DIMES), University of Genoa, Genoa, Italy; Inter-University Center for the Promotion of the 3Rs Principles in Teaching & Research (Centro 3R), Pisa, Italy
| | - Anna Maria Bassi
- Department of Experimental Medicine (DIMES), University of Genoa, Genoa, Italy; Inter-University Center for the Promotion of the 3Rs Principles in Teaching & Research (Centro 3R), Pisa, Italy
| | - Stefano Gandolfi
- Ophthalmology Unit, Department of Biological, Biotechnological and Translational Sciences, University of Parma, Parma, Italy
| | - Alberto Izzotti
- Department of Experimental Medicine (DIMES), University of Genoa, Genoa, Italy; Mutagenesis Unit, IRCCS Ospedale Policlinico San Martino, Genoa, Italy
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144
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Kohan R, Collin A, Guizzardi S, Tolosa de Talamoni N, Picotto G. Reactive oxygen species in cancer: a paradox between pro- and anti-tumour activities. Cancer Chemother Pharmacol 2020; 86:1-13. [PMID: 32572519 DOI: 10.1007/s00280-020-04103-2] [Citation(s) in RCA: 24] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/21/2019] [Accepted: 06/10/2020] [Indexed: 12/13/2022]
Abstract
Cancer constitutes a group of heterogeneous diseases that share common features. They involve the existence of altered cellular pathways which result in uncontrolled cell proliferation. Deregulation of production and/or elimination of reactive oxygen species (ROS) appear to be a relevant issue in most of them. ROS have a dual role in cell metabolism: they are compromised in normal cellular homeostasis, but their overproduction has been reported to promote oxidative stress (OS), a process that may induce the damage of cell structures. ROS accumulation is implicated in the activation of signaling pathways that promote cell proliferation and metabolic adaptations to tumour growth. One characteristic of cancer cells is the sensitivity to OS, which often results from the combination of high anabolic needs and hypoxic growth conditions. However, there is still no clear evidence about the levels of oxidant species that promote cellular transformation or, otherwise, if OS induction could be adequate as an antitumour therapeutic tool. There is a need for novel therapeutic strategies based on the new knowledge of cancer biology. Targeting oncogenic molecular mechanisms with non-classical agents and/or natural compounds would be beneficial as chemoprevention or new adjuvant therapies. In addition, epigenetics and environment, and particularly dietary factors may influence the development and prevention of cancer. This article will present a revision of the current research about molecular aspects proposed to be involved in the anticancer features of oxidant and antioxidant-based therapies targeting cancer cells, and their participation in the balance of oxidative species and cancer cell death.
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Affiliation(s)
- Romina Kohan
- Cátedra de Bioquímica y Biología Molecular, Facultad de Ciencias Médicas, UNC, INICSA (CONICET-UNC), Pabellón Argentina, 2do Piso, Ciudad Universitaria, 5000, Córdoba, Argentina.,Cátedra de Biología Celular A, Facultad de Odontología, UNC, Córdoba, Argentina
| | - Alejandro Collin
- Cátedra de Bioquímica y Biología Molecular, Facultad de Ciencias Médicas, UNC, INICSA (CONICET-UNC), Pabellón Argentina, 2do Piso, Ciudad Universitaria, 5000, Córdoba, Argentina
| | - Solange Guizzardi
- Cátedra de Bioquímica y Biología Molecular, Facultad de Ciencias Médicas, UNC, INICSA (CONICET-UNC), Pabellón Argentina, 2do Piso, Ciudad Universitaria, 5000, Córdoba, Argentina
| | - Nori Tolosa de Talamoni
- Cátedra de Bioquímica y Biología Molecular, Facultad de Ciencias Médicas, UNC, INICSA (CONICET-UNC), Pabellón Argentina, 2do Piso, Ciudad Universitaria, 5000, Córdoba, Argentina
| | - Gabriela Picotto
- Cátedra de Bioquímica y Biología Molecular, Facultad de Ciencias Médicas, UNC, INICSA (CONICET-UNC), Pabellón Argentina, 2do Piso, Ciudad Universitaria, 5000, Córdoba, Argentina.
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145
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Wang H, Ki JS. Molecular identification, differential expression and protective roles of iron/manganese superoxide dismutases in the green algae Closterium ehrenbergii against metal stress. Eur J Protistol 2020; 74:125689. [DOI: 10.1016/j.ejop.2020.125689] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/02/2019] [Revised: 02/05/2020] [Accepted: 02/26/2020] [Indexed: 12/12/2022]
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146
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Selvi A, Devi K, Manimekalai R, Prathima PT. Comparative analysis of drought-responsive transcriptomes of sugarcane genotypes with differential tolerance to drought. 3 Biotech 2020; 10:236. [PMID: 32399386 PMCID: PMC7203378 DOI: 10.1007/s13205-020-02226-0] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/25/2020] [Accepted: 04/24/2020] [Indexed: 01/05/2023] Open
Abstract
Water stress causes considerable yield losses in sugarcane. To investigate differentially expressed genes under water stress, two sugarcane genotypes were subjected to three water-deficit levels (mild, moderate, and severe) and subsequent recovery and leaf transcriptome was generated using Illumina NextSeq sequencing. Among the differentially expressed genes, the tolerant genotype Co 06022 generated 2970 unigenes (p ≤ 0.05, functionally known, non-redundant DEGs) at 2-day stress, and there was a progressive decrease in the expressed genes as the stress period increased with 2109 unigenes at 6-day stress and 2307 unigenes at 10-day stress. There was considerable reduction at recovery with 1334 unigenes expressed at 10 days after recovery. However, in the susceptible genotype Co 8021, the number of unigenes expressed at 2 days was lower (2025) than the tolerant genotype and a further reduction was seen at 6-day stress (1552). During recovery, more differentially expressed genes were observed in the susceptible cultivar indicating that the cultivar has to activate more functions/processes to recover from the damage caused by stress. Comparison of DEGs between all stages of stress and recovery in both genotypes revealed that, the commonly up- and down-regulated genes across different stages were approximately double in the tolerant genotype. The most enriched gene ontology classes were heme binding, peroxidase activity and metal ion binding in the biological process and response to oxidative stress, hydrogen peroxide catabolic process and response to stress in the molecular function category. The cellular component was enriched with DEGs involved in extracellular region followed by integral component of membrane. The KEGG pathway analysis revealed important metabolic activities and functionally important genes involved in mitigating water-deficit stress in both the varieties. In addition, several unannotated genes in important pathways were detected and together may provide novel insights into water-deficit tolerance mechanisms in sugarcane. The reliability of the observed expression patterns was confirmed by qRT-PCR. The results of this study will help to identify useful genes for improving drought tolerance in sugarcane.
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Affiliation(s)
- A. Selvi
- Biotechnology Section, Division of Crop Improvement, Indian Council of Agricultural Research- Sugarcane Breeding Institute, Coimbatore, Tamil Nadu 641 007 India
| | - K. Devi
- Biotechnology Section, Division of Crop Improvement, Indian Council of Agricultural Research- Sugarcane Breeding Institute, Coimbatore, Tamil Nadu 641 007 India
| | - R. Manimekalai
- Biotechnology Section, Division of Crop Improvement, Indian Council of Agricultural Research- Sugarcane Breeding Institute, Coimbatore, Tamil Nadu 641 007 India
| | - P. T. Prathima
- Biotechnology Section, Division of Crop Improvement, Indian Council of Agricultural Research- Sugarcane Breeding Institute, Coimbatore, Tamil Nadu 641 007 India
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147
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Kumar Pal C, Mahato S, Joshi M, Paul S, Roy Choudhury A, Biswas B. Transesterification activity by a zinc(II)-Schiff base complex with theoretical interpretation. Inorganica Chim Acta 2020. [DOI: 10.1016/j.ica.2020.119541] [Citation(s) in RCA: 16] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/01/2022]
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148
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Huehne PS, Bhinija K, Srisomsap C, Chokchaichamnankit D, Weeraphan C, Svasti J, Mongkolsuk S. Detection of superoxide dismutase (Cu-Zn) isoenzymes in leaves and pseudobulbs of Bulbophyllum morphologlorum Kraenzl orchid by comparative proteomic analysis. Biochem Biophys Rep 2020; 22:100762. [PMID: 32395639 PMCID: PMC7210398 DOI: 10.1016/j.bbrep.2020.100762] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/12/2019] [Revised: 02/26/2020] [Accepted: 02/27/2020] [Indexed: 11/28/2022] Open
Abstract
Typically, biological systems are protected from the toxic effect of free radicals by antioxidant defense. Extracts from orchids have been reported to show high levels of exogenous antioxidant activity including Bulbophyllum orchids but so far, there have been no reports on antioxidant enzymes. Therefore, differences in protein expression from leaves and pseudobulbs of Bulbophyllum morphologlorum Kraenzl and Dendrobium Sonia Earsakul were studied using two-dimensional gel electrophoresis and mass spectrometry (LC/MS/MS). Interestingly, the largest group of these stress response proteins were associated with antioxidant defense and temperature stress, including superoxide dismutase (Cu–Zn) and heat shock protein 70. The high expression of this antioxidant enzyme from Bulbophyllum morphologlorum Kraenzl was confirmed by activity staining on native-PAGE, and the two Cu/Zn-SODs isoenzymes were identified as Cu/Zn-SOD 1 and Cu/Zn-SOD 2 by LC/MS/MS. The results suggested that Bulbophyllum orchid can be a potential plant source for medicines and natural antioxidant supplements.
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Affiliation(s)
- Pattana S Huehne
- Laboratory of Biotechnology, Chulabhorn Research Institute, Bangkok, 10210, Thailand
| | - Kisana Bhinija
- Laboratory of Biotechnology, Chulabhorn Research Institute, Bangkok, 10210, Thailand
| | - Chantragan Srisomsap
- Laboratory of Biochemistry, Chulabhorn Research Institute, Bangkok, 10210, Thailand
| | | | - Churat Weeraphan
- Laboratory of Biochemistry, Chulabhorn Research Institute, Bangkok, 10210, Thailand
| | - Jisnuson Svasti
- Laboratory of Biochemistry, Chulabhorn Research Institute, Bangkok, 10210, Thailand.,Applied Biological Sciences Program, Chulabhorn Graduate Institute, Chulabhorn Royal Academy, Bangkok, 10210, Thailand
| | - Skorn Mongkolsuk
- Laboratory of Biotechnology, Chulabhorn Research Institute, Bangkok, 10210, Thailand.,Applied Biological Sciences Program, Chulabhorn Graduate Institute, Chulabhorn Royal Academy, Bangkok, 10210, Thailand
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149
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Stephenie S, Chang YP, Gnanasekaran A, Esa NM, Gnanaraj C. An insight on superoxide dismutase (SOD) from plants for mammalian health enhancement. J Funct Foods 2020. [DOI: 10.1016/j.jff.2020.103917] [Citation(s) in RCA: 21] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023] Open
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Chatzidimitriou E, Bisaccia P, Corrà F, Bonato M, Irato P, Manuto L, Toppo S, Bakiu R, Santovito G. Copper/Zinc Superoxide Dismutase from the Crocodile Icefish Chionodraco hamatus: Antioxidant Defense at Constant Sub-Zero Temperature. Antioxidants (Basel) 2020; 9:antiox9040325. [PMID: 32316382 PMCID: PMC7222407 DOI: 10.3390/antiox9040325] [Citation(s) in RCA: 17] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/29/2020] [Revised: 04/13/2020] [Accepted: 04/14/2020] [Indexed: 12/11/2022] Open
Abstract
In the present study, we describe the purification and molecular characterization of Cu,Zn superoxide dismutase (SOD) from Chionodraco hamatus, an Antarctic teleost widely distributed in many areas of the Ross Sea that plays a pivotal role in the Antarctic food chain. The primary sequence was obtained using biochemical and molecular biology approaches and compared with Cu,Zn SODs from other organisms. Multiple sequence alignment using the amino acid sequence revealed that Cu,Zn SOD showed considerable sequence similarity with its orthologues from various vertebrate species, but also some specific substitutions directly linked to cold adaptation. Phylogenetic analyses presented the monophyletic status of Antartic Teleostei among the Perciformes, confirming the erratic differentiation of these proteins and concurring with the theory of the "unclock-like" behavior of Cu,Zn SOD evolution. Expression of C. hamatus Cu,Zn SOD at both the mRNA and protein levels were analyzed in various tissues, highlighting the regulation of gene expression related to environmental stress conditions and also animal physiology. The data presented are the first on the antioxidant enzymes of a fish belonging to the Channichthyidae family and represent an important starting point in understanding the antioxidant systems of these organisms that are subject to constant risk of oxidative stress.
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Affiliation(s)
- Evangelia Chatzidimitriou
- Institute of Natural Resource Sciences, ZHAW Zurich University of Applied Sciences, 8820 Wädenswil, Switzerland;
| | - Paola Bisaccia
- Department of Biology, University of Padova, 35131 Padova, Italy; (P.B.); (F.C.); (M.B.); (P.I.)
| | - Francesca Corrà
- Department of Biology, University of Padova, 35131 Padova, Italy; (P.B.); (F.C.); (M.B.); (P.I.)
| | - Marco Bonato
- Department of Biology, University of Padova, 35131 Padova, Italy; (P.B.); (F.C.); (M.B.); (P.I.)
| | - Paola Irato
- Department of Biology, University of Padova, 35131 Padova, Italy; (P.B.); (F.C.); (M.B.); (P.I.)
| | - Laura Manuto
- Department of Molecular Medicine, University of Padova, 35131 Padova, Italy; (L.M.); (S.T.)
| | - Stefano Toppo
- Department of Molecular Medicine, University of Padova, 35131 Padova, Italy; (L.M.); (S.T.)
- CRIBI Biotech Centre, University of Padova, 35131 Padova, Italy
| | - Rigers Bakiu
- Department of Aquaculture and Fisheries, Agricultural University of Tirana, 1000 Tiranë, Albania;
| | - Gianfranco Santovito
- Department of Biology, University of Padova, 35131 Padova, Italy; (P.B.); (F.C.); (M.B.); (P.I.)
- Correspondence:
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