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Oztekin A, Almaz Z, Onlu S. Production and purification of peroxidases from callus cultures of white and red cabbage for enzymatic decolourization of reactive blue 19 and acid blue 25 dyes. BIOCATAL BIOTRANSFOR 2021. [DOI: 10.1080/10242422.2021.1906659] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
Affiliation(s)
- Aykut Oztekin
- Department of Medical Services and Techniques, Vocational School of Health Services, Agri Ibrahim Cecen University, Agri, Turkey
| | - Zuleyha Almaz
- Molecular Biology and Genetics Department, Faculty of Science and Literature, Mus Alparslan University, Mus, Turkey
| | - Seyma Onlu
- Molecular Biology and Genetics Department, Faculty of Science and Literature, Mus Alparslan University, Mus, Turkey
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Abdel-Aty AM, Salama WH, El-Badry MO, Salah HA, Barakat AZ, Fahmy AS, Mohamed SA. Purification and characterization of peroxidases from garden cress sprouts and their roles in lignification and removal of phenol and p-chlorophenol. J Food Biochem 2020; 45:e13526. [PMID: 33140461 DOI: 10.1111/jfbc.13526] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/30/2020] [Revised: 09/11/2020] [Accepted: 09/28/2020] [Indexed: 12/14/2022]
Abstract
The study aims to evaluate the relation between peroxidases of day-6 garden cress sprouts and phenolic compounds. Three cationic, three anionic, and two unbounded peroxidases were separated from day-6 garden cress sprouts. Cationic (GCP1) and anionic (GCP2) peroxidases were purified with molecular masses of 25 and 40 kDa, respectively. The Km values of GCP1 toward H2 O2 and guaiacol were lower than GCP2. The anionic GCP2 exhibited high affinity toward some lignin monomers, sinapyl alcohol, coniferyl alcohol, cinnamic and ferulic acids. Therefore, GCP2 is considered as a lignin peroxidase and contributed in lignin synthesis. The activity of GCP1 and GCP2 was stable at a wide pH range 5.5-8.0 and 6.0-7.5, respectively. Both peroxidases showed the same thermal stability range 20-50°C. GCP2 was more resistant against the effect of metal ions than GCP1. GCP2 showed high ability to remove of phenol and p-chlorophenol from effluent compared to GCP1. PRACTICAL APPLICATIONS: Generally, garden cress is used as a test plant to conduct biomonitoring of pollution in urban soil on a wide scale because of its simplicity, sensitivity, and cost-effectiveness. Peroxidase is an important antioxidant enzyme, which elevated when plant subjected to pollution. Recently, we reported that the increase of peroxidase activity was strongly correlated with high phenolic content and antioxidant activity during the germination of garden cress. In the present study, anionic peroxidase GCP2 may play an important role in lignification process and removal of phenol and p-chlorophenol from polluted soil/wastewater as well as resisted the harmful effect of heavy metals. Cationic peroxidase GCP1, as a natural scavenger, had high affinity toward H2 O2 coupled to oxidation of some plant phenolic compounds suggesting its role in consuming of excess H2 O2 .
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Affiliation(s)
- Azza M Abdel-Aty
- Molecular Biology Department, National Research Centre, Dokki, Cairo, Egypt
| | - Walaa H Salama
- Molecular Biology Department, National Research Centre, Dokki, Cairo, Egypt
| | - Mohamed O El-Badry
- Molecular Biology Department, National Research Centre, Dokki, Cairo, Egypt
| | - Hala A Salah
- Molecular Biology Department, National Research Centre, Dokki, Cairo, Egypt
| | - Amal Z Barakat
- Molecular Biology Department, National Research Centre, Dokki, Cairo, Egypt
| | - Afaf S Fahmy
- Molecular Biology Department, National Research Centre, Dokki, Cairo, Egypt
| | - Saleh A Mohamed
- Molecular Biology Department, National Research Centre, Dokki, Cairo, Egypt
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Brochier B, Hertz PF, Marczak LDF, Mercali GD. Influence of ohmic heating on commercial peroxidase and sugarcane juice peroxidase inactivation. J FOOD ENG 2020. [DOI: 10.1016/j.jfoodeng.2020.110066] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
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Zeyadi M. Purification and characterization of peroxidase from date palm cv. Agwa fruits. INTERNATIONAL JOURNAL OF FOOD PROPERTIES 2019. [DOI: 10.1080/10942912.2019.1691589] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
Affiliation(s)
- Mustafa Zeyadi
- Biochemistry Department, Faculty of Science, King Abdulaziz University, Jeddah, Saudi Arabia
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Köktepe T, Altın S, Tohma H, Gülçin İ, Köksal E. Purification, characterization and selected inhibition properties of peroxidase from haricot bean (Phaseolus vulgaris L.). INTERNATIONAL JOURNAL OF FOOD PROPERTIES 2017. [DOI: 10.1080/10942912.2017.1360903] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
Affiliation(s)
- Tubanur Köktepe
- Department of Chemistry, Faculty of Science and Arts, Erzincan University, Erzincan, Turkey
| | - Sevgi Altın
- Department of Chemistry, Faculty of Science and Arts, Erzincan University, Erzincan, Turkey
| | - Hatice Tohma
- Department of Chemistry, Faculty of Science and Arts, Erzincan University, Erzincan, Turkey
| | - İlhami Gülçin
- Department of Chemistry, Faculty of Science, Atatürk University, Erzincan, Turkey
| | - Ekrem Köksal
- Department of Chemistry, Faculty of Science and Arts, Erzincan University, Erzincan, Turkey
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Pandey VP, Rani J, Jaiswal N, Singh S, Awasthi M, Shasany AK, Tiwari S, Dwivedi UN. Chitosan immobilized novel peroxidase from Azadirachta indica : Characterization and application. Int J Biol Macromol 2017; 104:1713-1720. [DOI: 10.1016/j.ijbiomac.2017.02.047] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/10/2016] [Revised: 01/27/2017] [Accepted: 02/10/2017] [Indexed: 11/15/2022]
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Oliveira HP, Silva RGG, Oliveira JTA, Sousa DOB, Pereira ML, Souza PFN, Soares AA, Gomes VM, Monteiro-Moreira ACO, Moreno FBMB, Vasconcelos IM. A novel peroxidase purified from Marsdenia megalantha latex inhibits phytopathogenic fungi mediated by cell membrane permeabilization. Int J Biol Macromol 2017; 96:743-753. [PMID: 28057569 DOI: 10.1016/j.ijbiomac.2016.12.083] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/14/2016] [Revised: 12/30/2016] [Accepted: 12/31/2016] [Indexed: 10/20/2022]
Abstract
An antifungal class III peroxidase was purified from Marsdenia megalantha latex (named Mo-POX) using DEAE-cellulose and gel filtration chromatography on a Superose 12 HR 10/30 column. Mm-POX has an apparent molecular mass of 67.0kDa and a pI of 5.2, shares identity with other peroxidases, and follows Michaelis-Menten kinetics. It has a high affinity for guaiacol and hydrogen peroxide. The pH and temperature optima for Mm-POX were 5.0-7.0 and 60°C, respectively. The catalytic activity of Mm-POX was decreased in the presence of classic peroxidase inhibitors including azide, dithiothreitol, ethylenediamine tetraacetic acid, and sodium metabisulfite and high concentrations of Na+, Mn+, and salicylic acid. In contrast, Ca+ and Mg+, even at low concentrations, enhanced the Mm-POX enzymatic activity. This protein inhibited the germination of the conidia of the phytopathogenic fungi Fusarium oxysporum and Fusarium solani by acting through a membrane permeabilization mechanism. Mm-POX also induced oxidative stress in F. solani. Mm-POX is the first enzyme to be isolated from the M. megalantha species and it has potential use in the control of plant disease caused by important phytopathogenic fungi. This adds biotechnological value to this enzyme.
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Affiliation(s)
- Henrique P Oliveira
- Department of Biochemistry and Molecular Biology, Federal University of Ceara, 60440-900 Fortaleza, CE, Brazil; University of International Integration of the Afro-Brazilian Lusophony, 62790-000 Redençao, CE, Brazil
| | - Rodolpho G G Silva
- Department of Biochemistry and Molecular Biology, Federal University of Ceara, 60440-900 Fortaleza, CE, Brazil
| | - Jose T A Oliveira
- Department of Biochemistry and Molecular Biology, Federal University of Ceara, 60440-900 Fortaleza, CE, Brazil
| | - Daniele O B Sousa
- Department of Biochemistry and Molecular Biology, Federal University of Ceara, 60440-900 Fortaleza, CE, Brazil
| | - Mirella L Pereira
- Department of Biochemistry and Molecular Biology, Federal University of Ceara, 60440-900 Fortaleza, CE, Brazil
| | - Pedro F N Souza
- Department of Biochemistry and Molecular Biology, Federal University of Ceara, 60440-900 Fortaleza, CE, Brazil
| | - Arlete A Soares
- Department of Biology, Federal University of Ceara, 60440-900 Fortaleza, CE, Brazil
| | - Valdirene M Gomes
- Center of Bioscience and Biotechnology, State University of North Fluminense Darcy Ribeiro, 28013-602 Campos dos Goytacazes, RJ, Brazil
| | | | | | - Ilka M Vasconcelos
- Department of Biochemistry and Molecular Biology, Federal University of Ceara, 60440-900 Fortaleza, CE, Brazil.
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Pandey VP, Dwivedi UN. A ripening associated peroxidase from papaya having a role in defense and lignification: Heterologous expression and in-silico and in-vitro experimental validation. Gene 2015; 555:438-47. [DOI: 10.1016/j.gene.2014.11.013] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/15/2014] [Revised: 10/25/2014] [Accepted: 11/08/2014] [Indexed: 11/16/2022]
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Biobleaching of industrial important dyes with peroxidase partially purified from garlic. ScientificWorldJournal 2014; 2014:183163. [PMID: 25401128 PMCID: PMC4226186 DOI: 10.1155/2014/183163] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/14/2014] [Accepted: 09/14/2014] [Indexed: 11/17/2022] Open
Abstract
An acidic peroxidase was extracted from garlic (Allium sativum) and was partially purified threefold by ammonium sulphate precipitation, dialysis, and gel filtration chromatography using sephadex G-200. The specific activity of the enzyme increased from 4.89 U/mg after ammonium sulphate precipitation to 25.26 U/mg after gel filtration chromatography. The optimum temperature and pH of the enzyme were 50°C and 5.0, respectively. The Km and V max for H2O2 and o-dianisidine were 0.026 mM and 0.8 U/min, and 25 mM and 0.75 U/min, respectively. Peroxidase from garlic was effective in decolourizing Vat Yellow 2, Vat Orange 11, and Vat Black 27 better than Vat Green 9 dye. For all the parameters monitored, the decolourization was more effective at a pH range, temperature, H2O2 concentration, and enzyme concentration of 4.5-5.0, 50°C, 0.6 mM, and 0.20 U/mL, respectively. The observed properties of the enzyme together with its low cost of extraction (from local sources) show the potential of this enzyme for practical application in industrial wastewater treatment especially with hydrogen peroxide. These Vat dyes also exhibited potentials of acting as peroxidase inhibitors at alkaline pH range.
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Novo-Uzal E, Gutiérrez J, Martínez-Cortés T, Pomar F. Molecular cloning of two novel peroxidases and their response to salt stress and salicylic acid in the living fossil Ginkgo biloba. ANNALS OF BOTANY 2014; 114:923-36. [PMID: 25139427 PMCID: PMC4171070 DOI: 10.1093/aob/mcu160] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/25/2014] [Accepted: 06/16/2014] [Indexed: 05/21/2023]
Abstract
BACKGROUND AND AIMS Peroxidase isoenzymes play diverse roles in plant physiology, such as lignification and defence against pathogens. The actions and regulation of many peroxidases are not known with much accuracy. A number of studies have reported direct involvement of peroxidase isoenzymes in the oxidation of monolignols, which constitutes the last step in the lignin biosynthesis pathway. However, most of the available data concern only peroxidases and lignins from angiosperms. This study describes the molecular cloning of two novel peroxidases from the 'living fossil' Ginkgo biloba and their regulation by salt stress and salicylic acid. METHODS Suspension cell cultures were used to purify peroxidases and to obtain the cDNAs. Treatments with salicylic acid and sodium chloride were performed and peroxidase activity and gene expression were monitored. KEY RESULTS A novel peroxidase was purified, which preferentially used p-hydroxycinnamyl alcohols as substrates and was able to form dehydrogenation polymers in vitro from coniferyl and sinapyl alcohols. Two peroxidase full-length cDNAs, GbPrx09 and GbPrx10, were cloned. Both peroxidases showed high similarity to other basic peroxidases with a putative role in cell wall lignification. Both GbPrx09 and GbPrx10 were expressed in leaves and stems of the plant. Sodium chloride enhanced the gene expression of GbPrx09 but repressed GbPrx10, whereas salicylic acid strongly repressed both GbPrx09 and GbPrx10. CONCLUSIONS Taken together, the data suggest the participation of GbPrx09 and GbPrx10 in the developmental lignification programme of the cell wall. Both peroxidases possess the structural characteristics necessary for sinapyl alcohol oxidation. Moreover, GbPrx09 is also involved in lignification induced by salt stress, while salicylic acid-mediated lignification is not a result of GbPrx09 and GbPrx10 enzymatic activity.
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Affiliation(s)
- Esther Novo-Uzal
- Department of Plant Biology, University of Murcia, E-30100 Murcia, Spain Department of Animal Biology, Plant Biology and Ecology, University of A Coruña, E-15071 A Coruña, Spain
| | - Jorge Gutiérrez
- Department of Animal Biology, Plant Biology and Ecology, University of A Coruña, E-15071 A Coruña, Spain
| | - Teresa Martínez-Cortés
- Department of Animal Biology, Plant Biology and Ecology, University of A Coruña, E-15071 A Coruña, Spain
| | - Federico Pomar
- Department of Animal Biology, Plant Biology and Ecology, University of A Coruña, E-15071 A Coruña, Spain
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Wilkesman J, Castro D, Contreras LM, Kurz L. Guaiacol peroxidase zymography for the undergraduate laboratory. BIOCHEMISTRY AND MOLECULAR BIOLOGY EDUCATION : A BIMONTHLY PUBLICATION OF THE INTERNATIONAL UNION OF BIOCHEMISTRY AND MOLECULAR BIOLOGY 2014; 42:420-426. [PMID: 25052049 DOI: 10.1002/bmb.20809] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/24/2014] [Accepted: 05/26/2014] [Indexed: 06/03/2023]
Abstract
This laboratory exercise presents a novel way to introduce undergraduate students to the specific detection of enzymatic activity by electrophoresis. First, students prepare a crude peroxidase extract and then analyze the homogenate via electrophoresis. Zymography, that is, a SDS-PAGE method to detect enzyme activity, is used to specifically detect peroxidase activity and furthermore, to analyze the total protein profile. After the assay, students may estimate the apparent molecular mass of the enzyme and discuss its structure. After the 4-h experiment, students gain knowledge concerning biological sample preparation, gel preparation, electrophoresis, and the importance of specific staining procedures for the detection of enzymatic activity.
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Affiliation(s)
- Jeff Wilkesman
- Center for Environmental, Biology and Chemistry Research, Facultad de Ciencias y Tecnología, Universidad de Carabobo, Valencia, Carabobo, Venezuela
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Pradedova EV, Nimaeva OD, Salyaev RK. Effect of stress conditions on the activity and isozyme composition of peroxidase of vacuoles and tissue extract of red beet roots. BIOL BULL+ 2014. [DOI: 10.1134/s106235901403008x] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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Angelini VA, Agostini E, Medina MI, González PS. Use of hairy roots extracts for 2,4-DCP removal and toxicity evaluation by Lactuca sativa test. ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH INTERNATIONAL 2014; 21:2531-9. [PMID: 24085515 DOI: 10.1007/s11356-013-2172-1] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/30/2013] [Accepted: 09/16/2013] [Indexed: 05/27/2023]
Abstract
2,4-Dichlorophenol (2,4-DCP) is widely distributed in wastewaters discharged from several industries, and it is considered as a priority pollutant due to its high toxicity. In this study, the use of different peroxidase extracts for 2,4-DCP removal from aqueous solutions was investigated. Tobacco hairy roots (HRs), wild-type (WT), and double-transgenic (DT) for tomato basic peroxidases (TPX1 and TPX2) were used to obtain different peroxidase extracts: total peroxidases (TPx), soluble peroxidases (SPx), and peroxidases ionically bound to the cell wall (IBPx). All extracts derived from DT HRs exhibited higher peroxidase activity than those obtained from WT HRs. TPx and IBPx DT extracts showed the highest catalytic efficiency values. The optimal conditions for 2,4-DCP oxidation were pH 6.5, H2O2 0.5 mM, and 200 U mL(-1) of enzyme, for all extracts analyzed. Although both TPx extracts were able to oxidize different 2,4-DCP concentrations, the removal efficiency was higher for TPx DT. Polyethylene glycol addition slightly improved 2,4-DCP removal efficiency, and it showed some protective effect on TPx WT after 2,4-DCP oxidation. In addition, using Lactuca sativa test, a reduction of the toxicity of post removal solutions was observed, for both TPx extracts. The results demonstrate that TPx extracts from both tobacco HRs appear to be promising candidate for future applications in removing 2,4-DCP from wastewaters. This is particularly true considering that these peroxidase sources are associated with low costs and are readily available. However, TPx DT has increased peroxidase activity, catalytic efficiency, and higher removal efficiency than TPx WT, probably due to the expression of TPX1 and TPX2 isoenzymes.
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Affiliation(s)
- Vanina A Angelini
- Departamento de Biología Molecular, FCEFQN, Universidad Nacional de Río Cuarto, Ruta 36 Km 601, CP 5800, Río Cuarto, Córdoba, Argentina,
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A friendly method for Raphanus sativus L (wild radish) peroxidase purification by polyelectrolyte precipitation. Sep Purif Technol 2013. [DOI: 10.1016/j.seppur.2013.08.042] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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Goyal P, Chugh LK. Partial Purification and Characterization of Peroxidase from Pearl Millet (Pennisetum Glaucum
[L.] R. Br.) Grains. J Food Biochem 2013. [DOI: 10.1111/jfbc.12033] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Preeti Goyal
- Department of Biochemistry; CCS Haryana Agricultural University; Hisar Haryana 125004 India
| | - Lakshman K. Chugh
- Pearl Millet Quality Laboratory; Department of Genetics and Plant Breeding; CCS Haryana Agricultural University; Hisar Haryana 125004 India
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Tang L, Wang C, Huang J, Zhang J, Mao Z, Wang H. Comparative analysis of peroxidase profiles in Chinese kale (Brassica alboglabra L.): evaluation of leaf growth related isozymes. Food Chem 2013; 136:632-5. [PMID: 23122107 DOI: 10.1016/j.foodchem.2012.08.054] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/22/2012] [Revised: 07/31/2012] [Accepted: 08/22/2012] [Indexed: 10/27/2022]
Abstract
Plant peroxidases (EC 1.11.1.7) with different isoforms catalyze various reactions in plant growth and development. However, it is difficult to elucidate the function of each isozyme in one plant. Here, we compared profiles of entire isozyme in young seedling and mature leaves of Chinese kale (Brassica alboglabra L.) on zymogram and ion exchange chromatography in order to investigate leaf growth related peroxidase isozymes. The results showed that four isozymes were constitutively expressed in kale leaves, whereas other two isozymes were induced in the mature leaves. The Mono Q ion exchange chromatography separated the six isozymes into two major groups due to the difference in their isoelectric points. The results suggested that although there were several isozymes in the leaves of Chinese kale, one isozyme functioned mainly through the leaf development. Two anionic isozymes with molecular weights lower than 32 kDa were considered mature related.
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Affiliation(s)
- Lei Tang
- Key Laboratory of Industrial Biotechnology, Ministry of Education, Jiangnan University, No. 1800 Lihu Avenue, Wuxi, Jiangsu 214122, China.
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Purification and Characterization of Peroxidase from Papaya (Carica papaya) Fruit. Appl Biochem Biotechnol 2012; 167:367-76. [DOI: 10.1007/s12010-012-9672-1] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/19/2011] [Accepted: 04/09/2012] [Indexed: 10/28/2022]
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Purification and characterization of a novel thermal stable peroxidase from Jatropha curcas leaves. ACTA ACUST UNITED AC 2012. [DOI: 10.1016/j.molcatb.2011.12.002] [Citation(s) in RCA: 25] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
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Das MK, Sharma RS, Mishra V. A novel cationic peroxidase (VanPrx) from a hemi-parasitic plant (Viscum angulatum) of Western Ghats (India): Purification, characterization and kinetic properties. ACTA ACUST UNITED AC 2011. [DOI: 10.1016/j.molcatb.2011.03.010] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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Fernandes CF, Moraes VCP, Vasconcelos IM, Silveira JAG, Oliveira JTA. Induction of an anionic peroxidase in cowpea leaves by exogenous salicylic acid. JOURNAL OF PLANT PHYSIOLOGY 2006; 163:1040-8. [PMID: 16971216 DOI: 10.1016/j.jplph.2005.06.021] [Citation(s) in RCA: 24] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/14/2005] [Accepted: 06/29/2005] [Indexed: 05/11/2023]
Abstract
Two isoperoxidases were detected in cowpea (Vigna unguiculata) leaves. Treatment of the primary leaves with 10mM salicylic acid increased the total peroxidase activity contributed by the anionic isoform. To isolate both the anionic and cationic peroxidases the leaf crude extract was loaded on a Superose 12 HR 10/30 column followed by chromatography on Mono-Q HR 5/5. Both enzymes were stable in a pH range from 5 to 7. The optimum-temperatures for the cationic and anionic peroxidase isoforms were, respectively, 20-30 degrees C and 30 degrees C. The dependence of guaiacol oxidation rate varying its concentration at constant H(2)O(2) concentration showed, for both enzymes, Michaelis-Menten-type kinetic. Apparent K(m)(s) were 0.8 and 4.8 microM for the cationic and anionic isoperoxidases, respectively.
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