1
|
The Termite Fungal Cultivar Termitomyces Combines Diverse Enzymes and Oxidative Reactions for Plant Biomass Conversion. mBio 2021; 12:e0355120. [PMID: 34126770 PMCID: PMC8262964 DOI: 10.1128/mbio.03551-20] [Citation(s) in RCA: 10] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022] Open
Abstract
Macrotermitine termites have domesticated fungi in the genus Termitomyces as their primary food source using predigested plant biomass. To access the full nutritional value of lignin-enriched plant biomass, the termite-fungus symbiosis requires the depolymerization of this complex phenolic polymer. While most previous work suggests that lignocellulose degradation is accomplished predominantly by the fungal cultivar, our current understanding of the underlying biomolecular mechanisms remains rudimentary. Here, we provide conclusive omics and activity-based evidence that Termitomyces employs not only a broad array of carbohydrate-active enzymes (CAZymes) but also a restricted set of oxidizing enzymes (manganese peroxidase, dye decolorization peroxidase, an unspecific peroxygenase, laccases, and aryl-alcohol oxidases) and Fenton chemistry for biomass degradation. We propose for the first time that Termitomyces induces hydroquinone-mediated Fenton chemistry (Fe2+ + H2O2 + H+ → Fe3+ + •OH + H2O) using a herein newly described 2-methoxy-1,4-dihydroxybenzene (2-MH2Q, compound 19)-based electron shuttle system to complement the enzymatic degradation pathways. This study provides a comprehensive depiction of how efficient biomass degradation by means of this ancient insect’s agricultural symbiosis is accomplished.
Collapse
|
2
|
Magnetic Photocatalyst for Wastewater Tertiary Treatment at Pilot Plant Scale: Disinfection and Enrofloxacin Abatement. WATER 2021. [DOI: 10.3390/w13030329] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/16/2023]
Abstract
In this work, we have tested a photocatalytic material consisting of a core of SiO2/Fe3O4 coated with TiO2 (Magnox) for plausible tertiary wastewater treatment. For this, a pilot plant of 45 L equipped with an Ultraviolet light (UVC) lamp was employed to study the degradation of a model contaminant, enrofloxacin (ENR), as well as water disinfection (elimination of Escherichia coli and Clostridium perfringens). The influence of different operational conditions was explored by means of dye (rhodamine-B) decolorization rates, analyzing the effects of photocatalyst quantity, pH and recirculation flow rates. The magnox/UVC process was also compared with other four Advanced Oxidation Processes (AOPs): (i) UVC irradiation alone, (ii) hydrogen peroxide with UVC (H2O2/UVC), (iii) Fenton, and (iv) photo-Fenton. Although UVC irradiation was efficient enough to produce total water disinfection, only when employing the AOPs, significant degradations of ENR were observed, with photo-Fenton being the most efficient process (total enrofloxacin removal in 5 min and c.a. 80% mineralization in 120 min, at pH0 2.8). However, Magnox/UVC has shown great pollutant abatement effectiveness under neutral conditions, with the additional advantage of no acid or H2O2 addition, as well as its plausible reuse and simple separation due to its magnetic properties.
Collapse
|
3
|
Photoreactivity of Deep VB Titania Attained Via Molecular Layer Deposition; Interplay of Metal Oxide Thin Film Built-in Strain and Molecular Effects. Top Catal 2020. [DOI: 10.1007/s11244-020-01390-0] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022]
|
4
|
Mestivier M, Li JR, Camy A, Frangville C, Mingotaud C, Benoît‐Marquié F, Marty J. Copper‐Based Hybrid Polyion Complexes for Fenton‐Like Reactions. Chemistry 2020; 26:14152-14158. [DOI: 10.1002/chem.202002362] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/13/2020] [Indexed: 11/09/2022]
Affiliation(s)
- Mathieu Mestivier
- IMRCP UMR CNRS 5623 Bat 2R1 Université de Toulouse 118 Route de Narbonne 31062 Toulouse Cedex 9 France
| | - Jun Rong Li
- IMRCP UMR CNRS 5623 Bat 2R1 Université de Toulouse 118 Route de Narbonne 31062 Toulouse Cedex 9 France
| | - Aurèle Camy
- IMRCP UMR CNRS 5623 Bat 2R1 Université de Toulouse 118 Route de Narbonne 31062 Toulouse Cedex 9 France
| | - Camille Frangville
- IMRCP UMR CNRS 5623 Bat 2R1 Université de Toulouse 118 Route de Narbonne 31062 Toulouse Cedex 9 France
| | - Christophe Mingotaud
- IMRCP UMR CNRS 5623 Bat 2R1 Université de Toulouse 118 Route de Narbonne 31062 Toulouse Cedex 9 France
| | - Florence Benoît‐Marquié
- IMRCP UMR CNRS 5623 Bat 2R1 Université de Toulouse 118 Route de Narbonne 31062 Toulouse Cedex 9 France
| | - Jean‐Daniel Marty
- IMRCP UMR CNRS 5623 Bat 2R1 Université de Toulouse 118 Route de Narbonne 31062 Toulouse Cedex 9 France
| |
Collapse
|
5
|
Gamov GA, Zavalishin MN, Khokhlova AY, Gashnikova AV, Kiselev AN, Zav’yalov AV, Aleksandriiskii VV. Kinetics of the Oxidation of Protocatechuic and Gallic Acids by Atmospheric Oxygen in the Presence of Laccase from T. versicolor. RUSSIAN JOURNAL OF PHYSICAL CHEMISTRY A 2020. [DOI: 10.1134/s0036024420020119] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
|
6
|
Oueslati K, Promeyrat A, Gatellier P, Daudin JD, Kondjoyan A. Stoichio-Kinetic Modeling of Fenton Chemistry in a Meat-Mimetic Aqueous-Phase Medium. JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY 2018; 66:5892-5900. [PMID: 29782163 DOI: 10.1021/acs.jafc.7b06007] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/08/2023]
Abstract
Fenton reaction kinetics, which involved an Fe(II)/Fe(III) oxidative redox cycle, were studied in a liquid medium that mimics meat composition. Muscle antioxidants (enzymes, peptides, and vitamins) were added one by one in the medium to determine their respective effects on the formation of superoxide and hydroxyl radicals. A stoichio-kinetic mathematical model was used to predict the formation of these radicals under different iron and H2O2 concentrations and temperature conditions. The difference between experimental and predicted results was mainly due to iron reactivity, which had to be taken into account in the model, and to uncertainties on some of the rate constant values introduced in the model. This stoichio-kinetic model will be useful to predict oxidation during meat processes, providing it can be completed to take into account the presence of myoglobin in the muscle.
Collapse
Affiliation(s)
- Khaled Oueslati
- INRA, UR370 Qualité des Produits Animaux , 63122 Saint-Genès-Champanelle , France
| | - Aurélie Promeyrat
- INRA, UR370 Qualité des Produits Animaux , 63122 Saint-Genès-Champanelle , France
| | - Philippe Gatellier
- INRA, UR370 Qualité des Produits Animaux , 63122 Saint-Genès-Champanelle , France
| | | | - Alain Kondjoyan
- INRA, UR370 Qualité des Produits Animaux , 63122 Saint-Genès-Champanelle , France
| |
Collapse
|
7
|
Bayarsaikhan G, Dondurmacioglu F, Avan AN, Cekic SD, Apak R. Novel Colorimetric Assay of 2,3-Dihydroxybenzoate among Other Isomers as a Selective Indicator of Hydroxyl Radical Damage and Related Antioxidant Activity. ANAL LETT 2017. [DOI: 10.1080/00032719.2017.1328689] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
Affiliation(s)
| | - Ferda Dondurmacioglu
- Department of Chemistry, Faculty of Engineering, Istanbul University, Istanbul, Turkey
| | - Asli Neslihan Avan
- Department of Chemistry, Faculty of Engineering, Istanbul University, Istanbul, Turkey
| | - Sema Demirci Cekic
- Department of Chemistry, Faculty of Engineering, Istanbul University, Istanbul, Turkey
| | - Resat Apak
- Department of Chemistry, Faculty of Engineering, Istanbul University, Istanbul, Turkey
- Turkish Academy of Sciences (TUBA), Cankaya, Ankara, Turkey
| |
Collapse
|
8
|
Costa E Silva B, de Lima Perini JA, Nogueira RFP. Influence of dihydroxybenzenes on paracetamol and ciprofloxacin degradation and iron(III) reduction in Fenton processes. ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH INTERNATIONAL 2017; 24:6157-6164. [PMID: 26971519 DOI: 10.1007/s11356-016-6402-1] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/21/2015] [Accepted: 03/01/2016] [Indexed: 06/05/2023]
Abstract
The degradation of paracetamol (PCT) and ciprofloxacin (CIP) was compared in relation to the generation of dihydroxylated products, Fe(III) reduction and reaction rate in the presence of dihydroxybenzene (DHB) compounds, or under irradiation with free iron (Fe3+) or citrate complex (Fecit) in Fenton or photo-Fenton process. The formation of hydroquinone (HQ) was observed only during PCT degradation in the dark, which increased drastically the rate of PCT degradation, since HQ formed was able to reduce Fe3+ and contributed to PCT degradation efficiency. When HQ was initially added, PCT and CIP degradation rate in the dark was much higher in comparison to the absence of HQ, due to the higher and faster formation of Fe2+ at the beginning of reaction. In the absence of HQ, no CIP degradation was observed; however, when HQ was added after 30 min, the degradation rate increased drastically. Ten PCT hydroxylated intermediates were identified in the absence of HQ, which could contribute for Fe(III) reduction and consequently to the degradation in a similar way as HQ. During CIP degradation, only one product of hydroxyl radical attack on benzene ring and substitution of the fluorine atom was identified when HQ was added to the reaction medium.
Collapse
Affiliation(s)
- Beatriz Costa E Silva
- Department of Analytical Chemistry, Institute of Chemistry, UNESP - Univ Estadual Paulista, PO Box 355, 14800-060, Araraquara, SP, Brazil
| | - João Angelo de Lima Perini
- Department of Analytical Chemistry, Institute of Chemistry, UNESP - Univ Estadual Paulista, PO Box 355, 14800-060, Araraquara, SP, Brazil
| | - Raquel F Pupo Nogueira
- Department of Analytical Chemistry, Institute of Chemistry, UNESP - Univ Estadual Paulista, PO Box 355, 14800-060, Araraquara, SP, Brazil.
| |
Collapse
|
9
|
Gozzi F, Oliveira SC, Dantas RF, Silva VO, Quina FH, Machulek A. Kinetic studies of the reaction between pesticides and hydroxyl radical generated by laser flash photolysis. JOURNAL OF THE SCIENCE OF FOOD AND AGRICULTURE 2016; 96:1580-1584. [PMID: 25974279 DOI: 10.1002/jsfa.7258] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/27/2014] [Revised: 04/07/2015] [Accepted: 05/11/2015] [Indexed: 06/04/2023]
Abstract
BACKGROUND Due to contamination of the environment by pesticides and their mishandling, there is the need for treatment of contaminated sites and correct disposal of materials containing them. Thus, studies with advanced oxidation processes are expanding and can determine the rate constant of the hydroxyl radical with organic compounds of great importance in environmental contamination. In this context, the use of laser flash photolysis has been shown to be viable for the determination of these constants. RESULTS The reaction rate constants of different pesticides with HO(•) in degassed acetonitrile have been determined. They were 1.6 × 10(9) M(-1) s(-1), 0.6 × 10(9) M(-1) s(-1), 1.2 × 10(9) M(-1) s(-1), 2.4 × 10(9) M(-1) s(-1) and 2.2 × 10(9) M(-1) s(-1) for the pesticides carbaryl, propoxur, fenoxycarb, ethoxysulfuron and chlorimuron-ethyl, respectively. These values are about an order of magnitude smaller than the diffusion controlled rate and correlate with the relative rates of disappearance of the pesticides in the photo-Fenton reaction in water. CONCLUSION The correlation of the relative rate constants determined by laser flash photolysis with the relative rates of photo-Fenton degradation of the pesticides is compelling evidence for the participation of the hydroxyl radical in the degradation of these pesticides in the latter system.
Collapse
Affiliation(s)
- Fábio Gozzi
- Institute of Chemistry, Federal University of Mato Grosso do Sul, Av. Senador Filinto Muller 1555, CP 549, Campo Grande, MS, 79074-460, Brazil
| | - Silvio C Oliveira
- Institute of Chemistry, Federal University of Mato Grosso do Sul, Av. Senador Filinto Muller 1555, CP 549, Campo Grande, MS, 79074-460, Brazil
| | - Renato F Dantas
- School of Technology, University of Campinas UNICAMP, Paschoal Marmo 188, 13484-332, Limeira, SP, Brazil
| | - Volnir O Silva
- Institute of Chemistry, University of São Paulo, Av. Prof. Lineu Prestes 748, CP 26077, São Paulo, SP, 05513-970, Brazil
| | - Frank H Quina
- Institute of Chemistry, University of São Paulo, Av. Prof. Lineu Prestes 748, CP 26077, São Paulo, SP, 05513-970, Brazil
| | - Amilcar Machulek
- Institute of Chemistry, Federal University of Mato Grosso do Sul, Av. Senador Filinto Muller 1555, CP 549, Campo Grande, MS, 79074-460, Brazil
| |
Collapse
|