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Santo AAE, Lazaroti VHR, Feliciano GT. Multidimensional redox potential/p Ka coupling in multicopper oxidases from molecular dynamics: implications for the proton transfer mechanism. Phys Chem Chem Phys 2021; 23:27348-27354. [PMID: 34854859 DOI: 10.1039/d1cp03095g] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Bilirubin oxidases (BOD) are metalloenzymes that catalyze the conversion of O2 and bilirubin to biliverdin and water in the metabolism of chlorophyll and porphyrin. In this work we have used the CpHMD method to analyze the effects of the different oxidation states on the BOD trinuclear cluster (TNC). Our results demonstrate that there is a link between the different oxidation states of copper ions and the protonation capacity of nearby titratable residues. Each configuration affects pKa differently, creating proton gradients within the enzyme that act in an extremely orderly manner. This order is closely linked to the catalytic mechanism and leads us to the conclusion of the entry of the O2 molecule and its reduction in water molecules is associated with the probability of the release of protons from nearby acid groups. With this information, we deduce that under the initial reaction conditions the acidic side chains of nearby residues can be protonated; this allows the enzyme to reduce the activation energy of the reaction by coupling the proton transfer to oxidation state changes in the metallic center.
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Affiliation(s)
- Anderson A E Santo
- Enginerring, Physics and Mathematics Department, São Paulo State University (Unesp), Institute of Chemistry, Araraquara, Brazil.
| | - Vitor Hugo R Lazaroti
- Enginerring, Physics and Mathematics Department, São Paulo State University (Unesp), Institute of Chemistry, Araraquara, Brazil.
| | - Gustavo T Feliciano
- Enginerring, Physics and Mathematics Department, São Paulo State University (Unesp), Institute of Chemistry, Araraquara, Brazil.
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Preparation and Characterization of Chitosan-Coated Manganese-Ferrite Nanoparticles Conjugated with Laccase for Environmental Bioremediation. Polymers (Basel) 2021; 13:polym13091453. [PMID: 33946169 PMCID: PMC8125292 DOI: 10.3390/polym13091453] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/23/2021] [Revised: 04/27/2021] [Accepted: 04/27/2021] [Indexed: 01/09/2023] Open
Abstract
Bioremediation with immobilized enzymes has several advantages, such as the enhancement of selectivity, activity, and stability of biocatalysts, as well as enzyme reusability. Laccase has proven to be a good candidate for the removal of a wide range of contaminants. In this study, naked or modified MnFe2O4 magnetic nanoparticles (MNPs) were used as supports for the immobilization of laccase from Trametes versicolor. To increase enzyme loading and stability, MNPs were coated with chitosan both after the MNP synthesis (MNPs-CS) and during their formation (MNPs-CSin situ). SEM analysis showed different sizes for the two coated systems, 20 nm and 10 nm for MNPs-CS and MNPs-CSin situ, respectively. After covalent immobilization of laccase by glutaraldehyde, the MNPs-CSin situ-lac and MNPs-CS-lac systems showed a good resistance to temperature denaturation and storage stability. The most promising system for use in repeated batches was MNPs-CSin situ-lac, which degraded about 80% of diclofenac compared to 70% of the free enzyme. The obtained results demonstrated that the MnFe2O4-CSin situ system could be an excellent candidate for the removal of contaminants.
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3
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Xie P, Fan L, Huang L, Zhang C. Oxidative polymerization process of hydroxytyrosol catalysed by polyphenol oxidases or peroxidase: Characterization, kinetics and thermodynamics. Food Chem 2020; 337:127996. [PMID: 32919275 DOI: 10.1016/j.foodchem.2020.127996] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/29/2019] [Revised: 08/31/2020] [Accepted: 08/31/2020] [Indexed: 12/16/2022]
Abstract
Hydroxytyrosol oligomer prepared by bioenzyme shows stronger health-promoting properties than its monomer. However, the polymerization process carried out by laccase, tyrosinase or horseradish peroxidase is still lacking in term of product characterization, kinetics and thermodynamics. To achieve these aspects, ATR-FT-IR, NMR, the Michaelis-Menten equation and isothermal titration calorimetry were explored. The results showed that the identified polymers presented a CC bond and a degree of polymerization less than six. Laccase showed the greatest affinity to hydroxytyrosol via comparison of Km and Vm. All of these polymerization processes were spontaneous and exothermic behaviuors ranging from 30 to 50 °C, and were driven by hydrogen bonds, van der Waals interactions and hydrophobic interactions. Furthermore, circular dichroism spectroscopy was used to reveal the enzymatic structural changes during the catalysis, which showed that β-sheet levels for laccase, α-helix levels for tyrosinase, and the α-helix and random coil levels for horseradish peroxidase were dramatically decreased.
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Affiliation(s)
- Pujun Xie
- Institute of Chemical Industry of Forest Products, CAF, National Engineering Laboratory for Biomass Chemical Utilization, Key and Open Laboratory on Forest Chemical Engineering, SFA, Key Laboratory of Biomass Energy and Material, Nanjing 210042, Jiangsu Province, China; Co-Innovation Center of Efficient Processing and Utilization of Forest Resources, Nanjing Forestry University, Nanjing 210037, China.
| | - Linlin Fan
- Institute of Agro-product Processing, Jiangsu Academy of Agricultural Sciences, Nanjing 210014, China.
| | - Lixin Huang
- Institute of Chemical Industry of Forest Products, CAF, National Engineering Laboratory for Biomass Chemical Utilization, Key and Open Laboratory on Forest Chemical Engineering, SFA, Key Laboratory of Biomass Energy and Material, Nanjing 210042, Jiangsu Province, China; Co-Innovation Center of Efficient Processing and Utilization of Forest Resources, Nanjing Forestry University, Nanjing 210037, China.
| | - Caihong Zhang
- Institute of Chemical Industry of Forest Products, CAF, National Engineering Laboratory for Biomass Chemical Utilization, Key and Open Laboratory on Forest Chemical Engineering, SFA, Key Laboratory of Biomass Energy and Material, Nanjing 210042, Jiangsu Province, China; Co-Innovation Center of Efficient Processing and Utilization of Forest Resources, Nanjing Forestry University, Nanjing 210037, China.
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4
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Xie P, Fan L, Huang L, Zhang C. Oxidative polymerization of hydroxytyrosol catalyzed by laccase, tyrosinase or horseradish peroxidase: influencing factors and molecular simulations. J Biomol Struct Dyn 2020; 39:5486-5497. [DOI: 10.1080/07391102.2020.1801512] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023]
Affiliation(s)
- Pujun Xie
- Institute of New Technology of Forestry, Chinese Academy of Forestry, Beijing, China
- Institute of Chemical Industry of Forest Products, Chinese Academy of Forestry; National Engineering Laboratory for Biomass Chemical Utilization; Key and Open Laboratory on Forest Chemical Engineering, National Forestry and Grassland Administration, Key Laboratory of Biomass Energy and Material, Nanjing, China
| | - Linlin Fan
- Institute of Agro-product Processing, JAAS, Nanjing, China
| | - Lixin Huang
- Institute of Chemical Industry of Forest Products, Chinese Academy of Forestry; National Engineering Laboratory for Biomass Chemical Utilization; Key and Open Laboratory on Forest Chemical Engineering, National Forestry and Grassland Administration, Key Laboratory of Biomass Energy and Material, Nanjing, China
| | - Caihong Zhang
- Institute of Chemical Industry of Forest Products, Chinese Academy of Forestry; National Engineering Laboratory for Biomass Chemical Utilization; Key and Open Laboratory on Forest Chemical Engineering, National Forestry and Grassland Administration, Key Laboratory of Biomass Energy and Material, Nanjing, China
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Mollania N, Heidari M, Khajeh K. Catalytic activation of Bacillus laccase after temperature treatment: Structural & biochemical characterization. Int J Biol Macromol 2018; 109:49-56. [DOI: 10.1016/j.ijbiomac.2017.12.003] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/14/2017] [Revised: 11/27/2017] [Accepted: 12/03/2017] [Indexed: 11/27/2022]
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6
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Arca-Ramos A, Kumar VV, Eibes G, Moreira MT, Cabana H. Recyclable cross-linked laccase aggregates coupled to magnetic silica microbeads for elimination of pharmaceuticals from municipal wastewater. ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH INTERNATIONAL 2016; 23:8929-8939. [PMID: 26817474 DOI: 10.1007/s11356-016-6139-x] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/02/2015] [Accepted: 01/19/2016] [Indexed: 06/05/2023]
Abstract
In the present work, the use of magnetic mesoporous silica microbeads (MMSMB) as supports was proposed to produce magnetically-separable cross-linked enzyme aggregates (MCLEAs). The effects of cross linking time, addition of bovine serum albumin as protein feeder, pH, glutaraldehyde concentration, and laccase:MMSMB mass ratio on the immobilization yield and enzyme load were investigated. The best conditions allowed the rapid preparation of MCLEAs with high enzyme load, i.e., 1.53 U laccase/mg MCLEAs. The stability of MCLEAs was improved with regard to low pH, presence of chemical denaturants, and real wastewater matrix, compared to free laccase. In addition, the novel biocatalyst exhibited good operational stability, maintaining up to 70 % of its initial activity after 10 successive batch reactions. Finally, MCLEAs demonstrated its catalytic potential to transform acetaminophen and various non-phenolic pharmaceutical active compounds as mefenamic acid, fenofibrate, and indomethacin from biologically treated wastewater effluent, with similar or even higher efficiency than free laccase.
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Affiliation(s)
- A Arca-Ramos
- Department of Chemical Engineering, Institute of Technology, University of Santiago de Compostela, 15782, Santiago de Compostela, Spain
| | - V V Kumar
- Department of Biotechnology, School of Bioengineering, SRM University, Kattankulathur, Chennai, 603203, India
| | - G Eibes
- Department of Chemical Engineering, Institute of Technology, University of Santiago de Compostela, 15782, Santiago de Compostela, Spain
| | - M T Moreira
- Department of Chemical Engineering, Institute of Technology, University of Santiago de Compostela, 15782, Santiago de Compostela, Spain
| | - H Cabana
- Department of Civil Engineering, Université de Sherbrooke, 2500 Boulevard de l'Université, Sherbrooke, Québec, J1K 2R1, Canada.
- Environmental Engineering Laboratory, Department of Civil Engineering, Université de Sherbrooke, 2500 Boulevard de l'Université, Sherbrooke, Québec, J1K 2R1, Canada.
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Roth S, Spiess AC. Laccases for biorefinery applications: a critical review on challenges and perspectives. Bioprocess Biosyst Eng 2015; 38:2285-313. [DOI: 10.1007/s00449-015-1475-7] [Citation(s) in RCA: 71] [Impact Index Per Article: 7.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/24/2015] [Accepted: 09/21/2015] [Indexed: 10/23/2022]
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8
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Rangelov S, Nicell JA. A model of the transient kinetics of laccase-catalyzed oxidation of phenol at micromolar concentrations. Biochem Eng J 2015. [DOI: 10.1016/j.bej.2015.02.034] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/04/2023]
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9
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Zhang Z, Zhang Z, Chen H, Liu J, Liu C, Ni H, Zhao C, Ali M, Liu F, Li L. Surface Mn(II) oxidation actuated by a multicopper oxidase in a soil bacterium leads to the formation of manganese oxide minerals. Sci Rep 2015; 5:10895. [PMID: 26039669 PMCID: PMC4454072 DOI: 10.1038/srep10895] [Citation(s) in RCA: 36] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/15/2015] [Accepted: 04/30/2015] [Indexed: 11/22/2022] Open
Abstract
In this manuscript, we report that a bacterial multicopper oxidase (MCO266) catalyzes Mn(II) oxidation on the cell surface, resulting in the surface deposition of Mn(III) and Mn(IV) oxides and the gradual formation of bulky oxide aggregates. These aggregates serve as nucleation centers for the formation of Mn oxide micronodules and Mn-rich sediments. A soil-borne Escherichia coli with high Mn(II)-oxidizing activity formed Mn(III)/Mn(IV) oxide deposit layers and aggregates under laboratory culture conditions. We engineered MCO266 onto the cell surfaces of both an activity-negative recipient and wild-type strains. The results confirmed that MCO266 governs Mn(II) oxidation and initiates the formation of deposits and aggregates. By contrast, a cell-free substrate, heat-killed strains, and intracellularly expressed or purified MCO266 failed to catalyze Mn(II) oxidation. However, purified MCO266 exhibited Mn(II)-oxidizing activity when combined with cell outer membrane component (COMC) fractions in vitro. We demonstrated that Mn(II) oxidation and aggregate formation occurred through an oxygen-dependent biotic transformation process that requires a certain minimum Mn(II) concentration. We propose an approximate electron transfer pathway in which MCO266 transfers only one electron to convert Mn(II) to Mn(III) and then cooperates with other COMC electron transporters to transfer the other electron required to oxidize Mn(III) to Mn(IV).
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Affiliation(s)
- Zhen Zhang
- 1] State Key Laboratory of Agricultural Microbiology, Huazhong Agricultural University, Wuhan 430070, China [2] Key Laboratory of Subtropical Agricultural Resource and Environment, Ministry of Agriculture, Huazhong Agricultural University, Wuhan 430070, China
| | - Zhongming Zhang
- State Key Laboratory of Agricultural Microbiology, Huazhong Agricultural University, Wuhan 430070, China
| | - Hong Chen
- State Key Laboratory of Agricultural Microbiology, Huazhong Agricultural University, Wuhan 430070, China
| | - Jin Liu
- State Key Laboratory of Agricultural Microbiology, Huazhong Agricultural University, Wuhan 430070, China
| | - Chang Liu
- State Key Laboratory of Agricultural Microbiology, Huazhong Agricultural University, Wuhan 430070, China
| | - Hong Ni
- School of Life Science, Hubei University, Wuhan 430062, China
| | - Changsong Zhao
- Key Laboratory of Subtropical Agricultural Resource and Environment, Ministry of Agriculture, Huazhong Agricultural University, Wuhan 430070, China
| | - Muhammad Ali
- State Key Laboratory of Agricultural Microbiology, Huazhong Agricultural University, Wuhan 430070, China
| | - Fan Liu
- Key Laboratory of Subtropical Agricultural Resource and Environment, Ministry of Agriculture, Huazhong Agricultural University, Wuhan 430070, China
| | - Lin Li
- State Key Laboratory of Agricultural Microbiology, Huazhong Agricultural University, Wuhan 430070, China
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Tavares APM, Silva CG, Dražić G, Silva AMT, Loureiro JM, Faria JL. Laccase immobilization over multi-walled carbon nanotubes: Kinetic, thermodynamic and stability studies. J Colloid Interface Sci 2015; 454:52-60. [PMID: 26002339 DOI: 10.1016/j.jcis.2015.04.054] [Citation(s) in RCA: 119] [Impact Index Per Article: 13.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/07/2015] [Revised: 04/12/2015] [Accepted: 04/25/2015] [Indexed: 01/20/2023]
Abstract
The biocatalytic performance of immobilized enzyme systems depends mostly on the intrinsic properties of both biomolecule and support, immobilization technique and immobilization conditions. Multi-walled carbon nanotubes (MWCNTs) possess unique features for enzyme immobilization by adsorption. Enhanced catalytic activity and stability can be achieved by optimization of the immobilization conditions and by investigating the effect of operational parameters. Laccase was immobilized over MWCNTs by adsorption. The hybrid material was characterized by Fourier transformed infrared (FTIR) spectroscopy, scanning and transmission electron microscopy (SEM and TEM, respectively). The effect of different operational conditions (contact time, enzyme concentration and pH) on laccase immobilization was investigated. Optimized conditions were used for thermal stability, kinetic, and storage and operational stability studies. The optimal immobilization conditions for a laccase concentration of 3.75μL/mL were a pH of 9.0 and a contact time of 30min (522 Ulac/gcarrier). A decrease in the thermal stability of laccase was observed after immobilization. Changes in ΔS and ΔH of deactivation were found for the immobilized enzyme. The Michaelis-Menten kinetic constant was higher for laccase/MWCNT system than for free laccase. Immobilized laccase maintained (or even increased) its catalytic performance up to nine cycles of utilization and revealed long-term storage stability.
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Affiliation(s)
- Ana P M Tavares
- LCM - Laboratory of Catalysis and Materials, LSRE - Laboratory of Separation and Reaction Engineering, Associate Laboratory LSRE-LCM, Faculdade de Engenharia, Universidade do Porto, Rua Dr. Roberto Frias s/n, 4200-465 Porto, Portugal.
| | - Cláudia G Silva
- LCM - Laboratory of Catalysis and Materials, LSRE - Laboratory of Separation and Reaction Engineering, Associate Laboratory LSRE-LCM, Faculdade de Engenharia, Universidade do Porto, Rua Dr. Roberto Frias s/n, 4200-465 Porto, Portugal
| | - Goran Dražić
- Department of Nanostructured Materials, Jožef Stefan Institute, Jamova 39, SI-1000 Ljubljana, Slovenia; Laboratory for Materials Chemistry, National Institute of Chemistry, Hajdrihova 19, SI-1000 Ljubljana, Slovenia
| | - Adrián M T Silva
- LCM - Laboratory of Catalysis and Materials, LSRE - Laboratory of Separation and Reaction Engineering, Associate Laboratory LSRE-LCM, Faculdade de Engenharia, Universidade do Porto, Rua Dr. Roberto Frias s/n, 4200-465 Porto, Portugal
| | - José M Loureiro
- LCM - Laboratory of Catalysis and Materials, LSRE - Laboratory of Separation and Reaction Engineering, Associate Laboratory LSRE-LCM, Faculdade de Engenharia, Universidade do Porto, Rua Dr. Roberto Frias s/n, 4200-465 Porto, Portugal
| | - Joaquim L Faria
- LCM - Laboratory of Catalysis and Materials, LSRE - Laboratory of Separation and Reaction Engineering, Associate Laboratory LSRE-LCM, Faculdade de Engenharia, Universidade do Porto, Rua Dr. Roberto Frias s/n, 4200-465 Porto, Portugal
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11
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Frazão CJR, Silva NHC, Freire CSR, Silvestre AJD, Xavier AMRB, Tavares APM. Bacterial cellulose as carrier for immobilization of laccase: Optimization and characterization. Eng Life Sci 2014. [DOI: 10.1002/elsc.201400054] [Citation(s) in RCA: 31] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/20/2023] Open
Affiliation(s)
| | - Nuno H. C. Silva
- Department of Chemistry; CICECO, University of Aveiro; Aveiro Portugal
| | | | | | | | - Ana P. M. Tavares
- Associate Laboratory LSRE/LCM; Laboratory of Separation and Reaction Engineering (LSRE); Department of Chemical Engineering, Faculty of Engineering; University of Porto; Porto Portugal
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12
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Pankratov D, Sotres J, Barrantes A, Arnebrant T, Shleev S. Interfacial behavior and activity of laccase and bilirubin oxidase on bare gold surfaces. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2014; 30:2943-51. [PMID: 24564218 DOI: 10.1021/la402432q] [Citation(s) in RCA: 32] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/24/2023]
Abstract
Two blue multicopper oxidases (MCOs) (viz. Trametes hirsuta laccase (ThLc) and Myrothecium verrucaria bilirubin oxidase (MvBOx)) were immobilized on bare polycrystalline gold (Au) surfaces by direct adsorption from both dilute and concentrated enzyme solutions. The adsorption was studied in situ by means of null ellipsometry. Moreover, both enzyme-modified and bare Au electrodes were investigated in detail by atomic force microscopy (AFM) as well as electrochemically. When adsorbed from dilute solutions (0.125 and 0.25 mg mL⁻¹ in the cases of ThLc and MvBOx, respectively), the amounts of enzyme per unit area were determined to be ca. 1.7 and 4.8 pmol cm⁻², whereas the protein film thicknesses were determined to be 29 and 30 Å for ThLc and MvBOx, respectively. A well-pronounced bioelectrocatalytic reduction of molecular oxygen (O₂) was observed on MvBOx/Au biocathodes, whereas this was not the case for ThLc-modified Au electrodes (i.e., adsorbed ThLc was catalytically inactive). The initially observed apparent k(cat)(app) values for adsorbed MvBOx and the enzyme in solution were found to be very close to each other (viz. 54 and 58 s⁻¹, respectively (pH 7.4, 25 °C)). However, after 3 h of operation of MvBOx/Au biocathodes, kcatapp dropped to 23 s⁻¹. On the basis of the experimental results, conformational changes of the enzymes (in all likelihood, their flattening on the Au surface) were suggested to explain the deactivation of MCOs on the bare Au electrodes.
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Affiliation(s)
- Dmitry Pankratov
- Biomedical Sciences, Health & Society, Malmö University , 205 06 Malmö, Sweden
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13
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Nair RR, Demarche P, Agathos SN. Formulation and characterization of an immobilized laccase biocatalyst and its application to eliminate organic micropollutants in wastewater. N Biotechnol 2013; 30:814-23. [DOI: 10.1016/j.nbt.2012.12.004] [Citation(s) in RCA: 67] [Impact Index Per Article: 6.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/01/2012] [Revised: 12/09/2012] [Accepted: 12/22/2012] [Indexed: 10/27/2022]
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Shleev S, Andoralov V, Falk M, Reimann CT, Ruzgas T, Srnec M, Ryde U, Rulíšek L. On the Possibility of Uphill Intramolecular Electron Transfer in Multicopper Oxidases: Electrochemical and Quantum Chemical Study of Bilirubin Oxidase. ELECTROANAL 2012. [DOI: 10.1002/elan.201200188] [Citation(s) in RCA: 47] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
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15
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Moţ AC, Pârvu M, Damian G, Irimie FD, Darula Z, Medzihradszky KF, Brem B, Silaghi-Dumitrescu R. A “yellow” laccase with “blue” spectroscopic features, from Sclerotinia sclerotiorum. Process Biochem 2012. [DOI: 10.1016/j.procbio.2012.03.006] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 10/28/2022]
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16
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Effect of onion-type multilamellar liposomes on Trametes versicolor laccase activity and stability. Biochimie 2012; 94:59-65. [DOI: 10.1016/j.biochi.2011.10.010] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/14/2011] [Accepted: 10/13/2011] [Indexed: 11/21/2022]
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17
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18
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Stepanova EV, Fedorova TV, Sorokina ON, Volkov VV, Koroleva OV, Dembo AT. Effect of solvent phase transitions on enzymatic activity and structure of laccase from Coriolus hirsutus. BIOCHEMISTRY (MOSCOW) 2009; 74:385-92. [DOI: 10.1134/s0006297909040051] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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19
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Hakulinen N, Andberg M, Kallio J, Koivula A, Kruus K, Rouvinen J. A near atomic resolution structure of a Melanocarpus albomyces laccase. J Struct Biol 2008; 162:29-39. [PMID: 18249560 DOI: 10.1016/j.jsb.2007.12.003] [Citation(s) in RCA: 57] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/23/2007] [Revised: 11/28/2007] [Accepted: 12/12/2007] [Indexed: 11/17/2022]
Affiliation(s)
- N Hakulinen
- Department of Chemistry, University of Joensuu, Yliopistonkatu 7, P.O. Box 111, FIN-80101 Joensuu, Finland.
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Morozova OV, Shumakovich GP, Gorbacheva MA, Shleev SV, Yaropolov AI. "Blue" laccases. BIOCHEMISTRY (MOSCOW) 2008; 72:1136-50. [PMID: 18021071 DOI: 10.1134/s0006297907100112] [Citation(s) in RCA: 229] [Impact Index Per Article: 14.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
Abstract
This review concerns copper-containing oxidases--laccases. Principal biochemical and electrochemical properties of laccases isolated from different sources are described, as well as their structure and mechanism of catalysis. Possible applications of laccases in different fields of biotechnology are discussed.
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Affiliation(s)
- O V Morozova
- Bach Institute of Biochemistry, Russian Academy of Sciences, 119071 Moscow, Russia
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Farnet AM, Gil G, Ferre E. Effects of pollutants on laccase activities of Marasmius quercophilus, a white-rot fungus isolated from a Mediterranean schlerophyllous litter. CHEMOSPHERE 2008; 70:895-900. [PMID: 17868772 DOI: 10.1016/j.chemosphere.2007.06.086] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/13/2007] [Revised: 06/28/2007] [Accepted: 06/30/2007] [Indexed: 05/17/2023]
Abstract
Marasmius quercophilus is a white-rot fungus involved in carbon recycling in Mediterranean ecosystems because of its laccase production. Here we described the effect of metal ions and halide salts, on laccase activity in order to point out the action of such environmental pollutants on this enzyme of major importance. Furthermore we tested organic solvent effects on laccase reaction since reaction mixture including solvent can be used in the transformation of xenobiotics. In the case of metal ions, we found that chloride ions were responsible for inhibition while CuSO(4) and MnSO(4) enhanced laccase activity. When halides were tested, we showed the following degree of inhibition: F(-)>Cl(-)>Br(-). Furthermore we found that I(-) was oxidized by laccase with I(2) as the product of the reaction. With ABTS, 50% of the laccase activity remains for solvent concentration ranging from 40% to 60% depending on the solvent used while with syringaldazine solvent concentration ranged from 50% to 70%. The organic solvent effects observed were probably a result of enzyme denaturation and of both enhancement of oxidised product solubilisation and of substrate solubilisation (for syringaldazine). These results show that laccase from M. quercophilus is not rapidly inhibited by certain environmental pollutants which sustains its role in carbon turnover under pertubation. However the strong effect of chloride ion on laccase activity should be further investigated with in situ studies since this could drastically influence carbon recycling in litters from Mediterranean littoral locations.
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Affiliation(s)
- A M Farnet
- Faculté des Sciences et Techniques de St Jérôme, Université Paul Cézanne, Marseille, France.
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Nazaruk E, Michota A, Bukowska J, Shleev S, Gorton L, Bilewicz R. Properties of native and hydrophobic laccases immobilized in the liquid-crystalline cubic phase on electrodes. J Biol Inorg Chem 2006; 12:335-44. [PMID: 17151864 DOI: 10.1007/s00775-006-0193-7] [Citation(s) in RCA: 39] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/21/2006] [Accepted: 10/24/2006] [Indexed: 12/01/2022]
Abstract
Both native Trametes hirsuta laccase and the same laccase modified with palmytic chains to turn it more hydrophobic were prepared and studied with cyclic voltammetry and Raman spectroscopy. Native laccase immobilized in the monoolein cubic phase was characterized with resonance Raman spectroscopy, which demonstrated that the structure at the "blue" copper site of the protein remained intact. The diamond-type monoolein cubic phase prevents denaturation of enzymes on the electrode surface and provides contact of the enzyme with the electrode either directly or through the mediation by electroactive probes. Direct electron transfer for both laccases incorporated into a lyotropic liquid crystal was obtained under anaerobic conditions, whereas bioelectrocatalytic activity was shown only for the native enzyme. The differences in electrochemical behavior of native and hydrophobic laccase as well as possible mechanisms of direct and mediated electron transfers are discussed. The Michaelis constant for 2,2'-azinobis(3-ethylbenzothiazoline-6-sulfonate) diammonium salt (ABTS2-), KMapp, and the maximal current, Imax, for the native enzyme immobilized onto the electrode were estimated to be 0.24 mM, and 5.3 microA, respectively. The maximal current density and the efficiency of the catalysis, Imax/KMapp, were found to be 73 microA cm-2 and 208.2 microA cm-2 mM-1, respectively, and indicated a high efficiency of oxygen electroreduction by the enzyme in the presence of ABTS2- in the cubic-phase environment. Rate constants were calculated to be 7.5x10(4) and 3.6x10(4) M-1 s-1 for native and hydrophobic laccase, respectively.
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Affiliation(s)
- Ewa Nazaruk
- Faculty of Chemistry, University of Warsaw, Pasteura 1, 02-093, Warsaw, Poland
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