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Papazlatani CV, Vasileiadis S, Panagopoulou EI, Damalas DE, Karas PA, Gerovasileiou E, Thomaidis NS, Karpouzas DG. Genomic, Transcriptomic and Suspect/Non-Target Screening Analyses Reveal the Role of CYP450s in the Degradation of Imazalil and Delineate Its Transformation Pathway by Cladosporium herbarum. Microb Biotechnol 2025; 18:e70102. [PMID: 39972684 PMCID: PMC11839493 DOI: 10.1111/1751-7915.70102] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/12/2024] [Revised: 01/07/2025] [Accepted: 01/23/2025] [Indexed: 02/21/2025] Open
Abstract
Imazalil (IMZ), a major surface water contaminant characterised by high environmental recalcitrance and toxicity, is used in fruit-packaging plants to control fungal infestations during storage. This leads to the production of wastewaters which should be treated on site before their environmental release. We previously isolated a Cladosporium herbarum strain, the first microorganism that could degrade IMZ. Here we describe the genetic network utilised by the fungus to degrade IMZ and its detailed transformation. Genomic and transcriptomic analysis of C. herbarum pointed to the involvement of strongly upregulated CYP450s in IMZ degradation, as further verified by cessation of its biodegradation by CYP450 inhibitors. LC-QTOF-HRMS analysis and suspect/non-target screening identified nine transformation products (TPs) of IMZ. IMZ biotransformation mainly proceeded through O-dealkylation, while other less important paths, most probably controlled by upregulated oxidases, were operative involving successive hydroxylation reactions. These lead to the formation of TPs like IMZ_313 and IMZ_331, with the former being further transformed through imidazole ring scission to IMZ_288, a TP reported for the first time. We provide first evidence for the transformation mechanism of IMZ by C. herbarum and the potential genes/enzymes involved, paving the way for the use of C. herbarum in the biodepuration of agro-industrial effluents.
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Affiliation(s)
| | | | | | - Dimitrios E. Damalas
- Department of ChemistryNational and Kapodistrian University of AthensZografouGreece
| | - Panagiotis A. Karas
- Department of Biochemistry and BiotechnologyUniversity of ThessalyLarissaGreece
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Saidi N, Erable B, Etchevery L, Cherif A, Chouchane H. Enhanced bioelectrochemical degradation of Thiabendazole using biostimulated Tunisian hypersaline sediments: kinetics, efficiency, and microbial community shifts. Front Microbiol 2025; 15:1529841. [PMID: 39834368 PMCID: PMC11743678 DOI: 10.3389/fmicb.2024.1529841] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/17/2024] [Accepted: 12/13/2024] [Indexed: 01/22/2025] Open
Abstract
Thiabendazole (TBZ), a recalcitrant fungicide, is frequently applied in postharvest fruit treatment and generates significant volumes of industrial wastewater (WW) that conventional treatment plants cannot handle. This explores a bioelectrochemical system (BES) for TBZ degradation using Tunisian hypersaline sediments (THSs) as inoculum. Four sets of BES, along with biological controls, were tested using THS subjected to different levels of TBZ biostimulation. Sediments underwent one, two, or three biostimulation phases with increasing TBZ concentrations (0, 10, 100, and 300 mg kg-1). Potentiostatic control was applied to BES, polarized at 0.1 V vs. saturated calomel reference electrode (SCE), with a carbon felt working electrode (72 cm2 L-1) and maintained at 25°C. While current production was very low, sediments biostimulated with 100 mg kg-1 kg TBZ produced the highest current density (3.2 mA m-2), a 5-fold increase over untreated sediments (0.6 mA m-2). GC-FID analysis showed >99% TBZ degradation in all reactors. The TBZ half-elimination time from 27 days with biological treatments to 19 days in BES and further to 6 days following biostimulation. Bacterial analysis revealed a substantial microbial community shift after biostimulation, with a reduction in Bacillota (-64%) and an increase in Proteobacteria (+62%), dominated by Pseudomonas (45%) and Marinobacter (16%). These findings provide insight into the selective potential of biostimulation cycles to enhance microbial community composition and improve BES performance for TBZ wastewater treatment.
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Affiliation(s)
- Nesrine Saidi
- ISBST, BVBGR-LR11ES31, Biotechpole Sidi Thabet, University of Manouba, Ariana, Tunisia
| | - Benjamin Erable
- Laboratoire de Génie Chimique, CNRS, INPT, UPS, Université de Toulouse, Toulouse, France
| | - Luc Etchevery
- Laboratoire de Génie Chimique, CNRS, INPT, UPS, Université de Toulouse, Toulouse, France
| | - Ameur Cherif
- ISBST, BVBGR-LR11ES31, Biotechpole Sidi Thabet, University of Manouba, Ariana, Tunisia
| | - Habib Chouchane
- ISBST, BVBGR-LR11ES31, Biotechpole Sidi Thabet, University of Manouba, Ariana, Tunisia
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Vo QV. Reactions of Diphenylamine with OH Radicals in the Environment: Theoretical Insights into the Mechanism, Kinetics, Temperature, and pH Effects. J Phys Chem B 2024; 128:11216-11228. [PMID: 39479903 DOI: 10.1021/acs.jpcb.4c05366] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/02/2024]
Abstract
Diphenylamine (DPL) has been widely utilized in industrial chemicals, but its degradation by HO• radicals in the environment has not been fully studied yet. The present study uses quantum chemical calculations to evaluate the reaction of DPL with HO• radicals in atmospheric and aqueous environments. The results showed that, in the atmosphere, the diphenylamine reacted with the HO• radical rapidly, with an overall rate constant of 9.24 × 1011 to 1.34 × 1011 M-1 s-1 and a lifetime of 0.17 to 1.55 h at 253-323 K. The calculated overall rate constant in water (koverall = 1.95 × 1010 M-1 s-1, pH = 3-14) is in excellent agreement with the experimental value (koverall = 1.00 × 1010-1.36 × 1010 M-1 s-1). The HO• + DPL reaction in water could occur following the hydrogen transfer (15.4%), single electron transfer (41.6%), and radical adduct formation (41.7%) mechanisms, clarifying that addition products were not exclusive products. Nevertheless, variations in temperature and pH within aqueous environments had an impact on the mechanisms, kinetics, and degradation products of the reaction of DPL with HO• radicals.
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Affiliation(s)
- Quan V Vo
- Faculty of Chemical Technology - Environment, The University of Danang - University of Technology and Education, Danang 550000, Vietnam
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Rubio-Sánchez R, Ubeda C, Ríos-Reina R. Feasibility of using volatile urine fingerprints for the differentiation of sexually transmitted infections. Appl Microbiol Biotechnol 2023; 107:6363-6376. [PMID: 37615721 PMCID: PMC10560160 DOI: 10.1007/s00253-023-12711-0] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/08/2023] [Revised: 07/20/2023] [Accepted: 07/25/2023] [Indexed: 08/25/2023]
Abstract
Sexually transmitted infections (STIs) are a public health problem worldwide, and current diagnostic methods have certain limitations. In recent years, volatile organic compounds (VOCs) have been studied as an alternative diagnostic method. Due to this, this study aimed to detect, in vaginal swabs and urine samples, VOCs emitted by highly prevalent STIs-causing bacteria (Chlamydia trachomatis, Mycoplasma genitalium, and Neisseria gonorrhoeae) to identify potential biomarkers that allow the detection of these STIs. VOCs detected in urine samples showed a better differentiation of patients with STIs due to C. trachomatis from those not infected, with 2,6-dimethyl-4-heptanone as the volatile compound most related to the presence of this bacterium. Among the VOCs most related to M. genitalium in urine, 4-methyltetradecane and 2-methylpentadecane stood out, while 3,4,4-trimethyl-2-cyclohexen-1-one was the VOC most closely related to N. gonorrhoeae infection. Moreover, C12 alcohols were the main VOC family associated with positive samples in all three bacteria, which could indicate the presence of aldehyde reductases in their metabolism. In contrast, alcohols such as 3-methyl-1-heptanol and 1-octanol, as well as dimethyl esters, were more associated with negative samples and may be useful in ruling out an STI caused by one of these three bacteria. In short, the VOCs identified as potential biomarkers in patients with infection by C. trachomatis, M. genitalium, or N. gonorrhoeae could be used in the early diagnosis of these STIs, quickly interrupting the chain of transmission, especially interesting in asymptomatic patients. KEY POINTS: • Sexually transmitted infections are a serious public health problem worldwide. • The study of VOCs in multiple infections is increasing in recent years. • The identification of volatile biomarkers could allow new diagnostic methods.
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Affiliation(s)
- Ricardo Rubio-Sánchez
- Servicio de Análisis Clínicos, Hospital Universitario Virgen de Valme, 41014 Seville, Spain
| | - Cristina Ubeda
- Departamento de Nutrición y Bromatología, Toxicología y Medicina Legal, Facultad de Farmacia, Universidad de Sevilla, 41012 Seville, Spain
| | - Rocío Ríos-Reina
- Departamento de Nutrición y Bromatología, Toxicología y Medicina Legal, Facultad de Farmacia, Universidad de Sevilla, 41012 Seville, Spain
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Papazlatani CV, Kolovou M, Gkounou EE, Azis K, Mavriou Z, Testembasis S, Karaoglanidis GS, Ntougias S, Karpouzas DG. Isolation, characterization and industrial application of a Cladosporium herbarum fungal strain able to degrade the fungicide imazalil. ENVIRONMENTAL POLLUTION (BARKING, ESSEX : 1987) 2022; 301:119030. [PMID: 35189300 DOI: 10.1016/j.envpol.2022.119030] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/16/2021] [Revised: 02/11/2022] [Accepted: 02/17/2022] [Indexed: 06/14/2023]
Abstract
Imazalil (IMZ) is an imidazole fungicide commonly used by fruit-packaging plants (FPPs) to control fungal infections during storage. Its application leads to the production of pesticide-contaminated wastewaters, which, according to the European Commission, need to be treated on site. Considering the lack of efficient treatment methods, biodepuration systems inoculated with tailored-made inocula specialized on the removal of such persistent fungicides appear as an appropriate solution. However, nothing is known about the biodegradation of IMZ. We aimed to isolate and characterize microorganisms able to degrade the recalcitrant fungicide IMZ and eventually to test their removal efficiency under near practical bioengineering conditions. Enrichment cultures from a soil receiving regular discharges of effluents from a FPP, led to the isolation of a Cladosporium herbarum strain, which showed no pathogenicity on fruits, a trait essential for its biotechnological exploitation in FPPs. The fungus was able to degrade up to 100 mg L-1 of IMZ. However, its degrading capacity and growth was reduced at increasing IMZ concentrations in a dose-dependent manner, suggesting the involvement of a detoxification rather than an energy-gain mechanism in the dissipation of IMZ. The isolate could tolerate and gradually degrade the fungicides fludioxonil (FLD) and thiabendazole (TBZ), also used in FPPs and expected to coincide alongside IMZ in FPP effluents. The capacity of the isolate to remove IMZ in a practical context was evaluated in a benchtop immobilized-cell bioreactor fed with artificial IMZ-contaminated wastewater (200 mg L-1). The fungal strain established in the reactor, completely dominated the fungal community and effectively removed >96% of IMZ. The bioreactor also supported a diverse bacterial community composed of Sphingomonadales, Burkholderiales and Pseudomonadales. Our study reports the isolation of the first IMZ-degrading microorganism with high efficiency to remove IMZ from agro-industrial effluents under bioengineering conditions.
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Affiliation(s)
- Christina V Papazlatani
- University of Thessaly, Department of Biochemistry and Biotechnology, Laboratory of Plant and Environmental Biotechnology, Viopolis, 41500, Larissa, Greece
| | - Maria Kolovou
- University of Thessaly, Department of Biochemistry and Biotechnology, Laboratory of Plant and Environmental Biotechnology, Viopolis, 41500, Larissa, Greece
| | - Elisabeth E Gkounou
- University of Thessaly, Department of Biochemistry and Biotechnology, Laboratory of Plant and Environmental Biotechnology, Viopolis, 41500, Larissa, Greece
| | - Konstantinos Azis
- Democritus University of Thrace, Department of Environmental Engineering, Laboratory of Wastewater Management and Treatment Technologies, Vas. Sofias 12, 67132, Xanthi, Greece
| | - Zografina Mavriou
- Democritus University of Thrace, Department of Environmental Engineering, Laboratory of Wastewater Management and Treatment Technologies, Vas. Sofias 12, 67132, Xanthi, Greece
| | - Stefanos Testembasis
- Aristotle University of Thessaloniki, Department of Agriculture, Plant Pathology Laboratory, University Campus, 54124, Thessaloniki, Greece
| | - George S Karaoglanidis
- Aristotle University of Thessaloniki, Department of Agriculture, Plant Pathology Laboratory, University Campus, 54124, Thessaloniki, Greece
| | - Spyridon Ntougias
- Democritus University of Thrace, Department of Environmental Engineering, Laboratory of Wastewater Management and Treatment Technologies, Vas. Sofias 12, 67132, Xanthi, Greece
| | - Dimitrios G Karpouzas
- University of Thessaly, Department of Biochemistry and Biotechnology, Laboratory of Plant and Environmental Biotechnology, Viopolis, 41500, Larissa, Greece.
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Domínguez-Rodríguez VI, Baltierra-Trejo E, Gómez-Cruz R, Adams RH. Microbial growth in biobeds for treatment of residual pesticide in banana plantations. PeerJ 2021; 9:e12200. [PMID: 34616634 PMCID: PMC8464193 DOI: 10.7717/peerj.12200] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/11/2021] [Accepted: 09/02/2021] [Indexed: 11/20/2022] Open
Abstract
Background High doses of ethylenebisdithiocarbamate (EBDC) are used in banana production, and unused pesticide mixture (solution) is often disposed of improperly. This can result in soil and water contamination and present an undue risk to rural communities and the environment. An alternative to reduce the environmental impacts caused by pesticide residues is the biobeds treatment. It is necessary to establish if the composition of the proposed biomixtures supports microbial activity to degrade pesticides in biobeds. This research aimed to evaluate the EBDC effect on the distribution and abundance of microbial populations in polluted biomixtures . Methods For this purpose, a biomixture based on banana stem, mulch, and Fluvisol soil (50:25:25% v/v) was prepared and polluted with 1,000 mg L-1 EBDC. The response variables kinetics were determined every 14 days for three months, such as pH, organic matter, moisture, cation exchange capacity, microbial colonies, and cell counts at three depths within the experimental units. Results EBDC reduced the number of microbial colonies by 72%. Bacterial cells rapidly decreased by 69% and fungi 89% on the surface, while the decrease was gradual and steady at the middle and bottom of the biobed. The microbial populations stabilized at day 42, and the bacteria showed a total recovery on day 84, but the fungi slightly less. At the end of the experiment, the concentration of EBDC in the biomixture was 1.3-4.1 mg L-1. A correlation was found between fungal count (colonies and cells) with EBDC concentration. A replacement of the biomixture is suggested if the bacterial population becomes less than 40 × 106 CFU mL-1 and the fungal population less than 8 × 104 CFU mL-1 or if the direct cell count becomes lower than 50 × 104 cells mL-1 in bacteria and 8 × 102 cells mL-1 in fungi. Conclusion The biomixture based on banana stem supports the microbial activity necessary for the degradation of the EBDC pesticide. It was found that fungi could be used as indicators of the pollutant degradation process in the biomixtures. Microbial counts were useful to establish the mobility and degradation time of the pesticide and the effectiveness of the biomixture. Based on the results, it is appropriate to include the quantification of microbial populations to assess the effectiveness of pesticide degradation and the maturity level of the biomixture.
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Affiliation(s)
| | - Eduardo Baltierra-Trejo
- División Académica de Ciencias Biológicas, Universidad Juárez Autónoma de Tabasco, Villahermosa, Tabasco, Mexico.,Catédras CONACyT, Consejo Nacional de Ciencia y Tecnología, Mexico City, Mexico
| | - Rodolfo Gómez-Cruz
- División Académica de Ciencias Biológicas, Universidad Juárez Autónoma de Tabasco, Villahermosa, Tabasco, Mexico
| | - Randy H Adams
- División Académica de Ciencias Biológicas, Universidad Juárez Autónoma de Tabasco, Villahermosa, Tabasco, Mexico
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Yao J, Zhang H, Chen L, Liu W, Gao N, Liu S, Chen X, Rao F. The Roles of Sono-induced Nitrosation and Nitration in the Sono-degradation of Diphenylamine in Water: Mechanisms, Kinetics and Impact Factors. JOURNAL OF HAZARDOUS MATERIALS 2021; 402:123720. [PMID: 33254758 DOI: 10.1016/j.jhazmat.2020.123720] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/26/2020] [Revised: 08/13/2020] [Accepted: 08/14/2020] [Indexed: 06/12/2023]
Abstract
The potential risks of sono-induced nitrosation and nitration side reactions and consequent toxic nitrogenous byproducts were first investigated via sono-degradation of diphenylamine (DPhA) in this study. The kinetic models for overall DPhA degradation and the formation of nitrosation byproduct (N-nitrosodiphenylamine, NDPhA) and nitration byproducts (2-nitro-DPhA and 4-nitro-DPhA) were well established and fitted (R2 > 0.98). Nitrosation contributed much more than nitration (namely, 43.3 - 47.3 times) to the sono-degradation of DPhA. The contribution of sono-induced nitrosation ranged from 0.4 to 56.6% at different conditions. The maximum NDPhA formation rate and the contribution of sono-induced nitrosation were obtained at 600 and 200 kHz, respectively, as ultrasonic frequencies at 200 to 800 kHz. Both NDPhA formation rate and the contribution of sono-induced nitrosation increased with increasing power density, while decreased with increasing initial pH and DPhA concentration. PO43-, HCO3-, NH4+ and Fe2+ presented negative impacts on sono-induced nitrosation in order of HCO3- >> Fe2+ > PO43- > NH4+, while Br- exhibited a promoting effect. The mechanism of NDPhA formation via sono-induced nitrosation was first proposed.
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Affiliation(s)
- Juanjuan Yao
- Key Laboratory of the Three Gorges Reservoir Regions Eco-Environment, Ministry of Education, Chongqing University, Chongqing, 400045, China
| | - Huiying Zhang
- Key Laboratory of the Three Gorges Reservoir Regions Eco-Environment, Ministry of Education, Chongqing University, Chongqing, 400045, China
| | - Longfu Chen
- Key Laboratory of the Three Gorges Reservoir Regions Eco-Environment, Ministry of Education, Chongqing University, Chongqing, 400045, China
| | - Wei Liu
- Key Laboratory of the Three Gorges Reservoir Regions Eco-Environment, Ministry of Education, Chongqing University, Chongqing, 400045, China
| | - Naiyun Gao
- State Key Laboratory of Pollution Control and Resources Reuse, Tongji University, Shanghai, 200092, China
| | - Shiyi Liu
- Key Laboratory of the Three Gorges Reservoir Regions Eco-Environment, Ministry of Education, Chongqing University, Chongqing, 400045, China
| | - Xiangyu Chen
- Key Laboratory of the Three Gorges Reservoir Regions Eco-Environment, Ministry of Education, Chongqing University, Chongqing, 400045, China
| | - Fanghui Rao
- Key Laboratory of the Three Gorges Reservoir Regions Eco-Environment, Ministry of Education, Chongqing University, Chongqing, 400045, China
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Katsoula A, Vasileiadis S, Sapountzi M, Karpouzas DG. The response of soil and phyllosphere microbial communities to repeated application of the fungicide iprodione: accelerated biodegradation or toxicity? FEMS Microbiol Ecol 2020; 96:5813261. [PMID: 32221586 DOI: 10.1093/femsec/fiaa056] [Citation(s) in RCA: 22] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/02/2019] [Accepted: 03/23/2020] [Indexed: 12/30/2022] Open
Abstract
Pesticides interact with microorganisms in various ways with the outcome being negative or positive for the soil microbiota. Pesticides' effects on soil microorganisms have been studied extensively in soil but not in other pesticides-exposed microbial habitats like the phyllosphere. We tested the hypothesis that soil and phyllosphere support distinct microbial communities, but exhibit a similar response (accelerated biodegradation or toxicity) to repeated exposure to the fungicide iprodione. Pepper plants received four repeated foliage or soil applications of iprodione, which accelerated its degradation in soil (DT50_1st = 1.23 and DT50_4th = 0.48 days) and on plant leaves (DT50_1st > 365 and DT50_4th = 5.95 days). The composition of the epiphytic and soil bacterial and fungal communities, determined by amplicon sequencing, was significantly altered by iprodione. The archaeal epiphytic and soil communities responded differently; the former showed no response to iprodione. Three iprodione-degrading Paenarthrobacter strains were isolated from soil and phyllosphere. They hydrolyzed iprodione to 3,5-dichloraniline via the formation of 3,5-dichlorophenyl-carboxiamide and 3,5-dichlorophenylurea-acetate, a pathway shared by other soil-derived arthrobacters implying a phylogenetic specialization in iprodione biotransformation. Our results suggest that iprodione-repeated application could affect soil and epiphytic microbial communities with implications for the homeostasis of the plant-soil system and agricultural production.
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Affiliation(s)
- A Katsoula
- Laboratory of Plant and Environmental Biotechnology, Department of Biochemistry and Biotechnology, University of Thessaly, Viopolis 41500, Larissa, Greece
| | - S Vasileiadis
- Laboratory of Plant and Environmental Biotechnology, Department of Biochemistry and Biotechnology, University of Thessaly, Viopolis 41500, Larissa, Greece
| | - M Sapountzi
- Laboratory of Plant and Environmental Biotechnology, Department of Biochemistry and Biotechnology, University of Thessaly, Viopolis 41500, Larissa, Greece
| | - Dimitrios G Karpouzas
- Laboratory of Plant and Environmental Biotechnology, Department of Biochemistry and Biotechnology, University of Thessaly, Viopolis 41500, Larissa, Greece
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Papadopoulou ES, Perruchon C, Vasileiadis S, Rousidou C, Tanou G, Samiotaki M, Molassiotis A, Karpouzas DG. Metabolic and Evolutionary Insights in the Transformation of Diphenylamine by a Pseudomonas putida Strain Unravelled by Genomic, Proteomic, and Transcription Analysis. Front Microbiol 2018; 9:676. [PMID: 29681895 PMCID: PMC5897751 DOI: 10.3389/fmicb.2018.00676] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/29/2017] [Accepted: 03/22/2018] [Indexed: 11/19/2022] Open
Abstract
Diphenylamine (DPA) is a common soil and water contaminant. A Pseudomonas putida strain, recently isolated from a wastewater disposal site, was efficient in degrading DPA. Thorough knowledge of the metabolic capacity, genetic stability and physiology of bacteria during biodegradation of pollutants is essential for their future industrial exploitation. We employed genomic, proteomic, transcription analyses and plasmid curing to (i) identify the genetic network of P. putida driving the microbial transformation of DPA and explore its evolution and origin and (ii) investigate the physiological response of bacterial cells during degradation of DPA. Genomic analysis identified (i) two operons encoding a biphenyl (bph) and an aniline (tdn) dioxygenase, both flanked by transposases and (ii) two operons and several scattered genes encoding the ortho-cleavage of catechol. Proteomics identified 11 putative catabolic proteins, all but BphA1 up-regulated in DPA- and aniline-growing cells, and showed that the bacterium mobilized cellular mechanisms to cope with oxidative stress, probably induced by DPA and its derivatives. Transcription analysis verified the role of the selected genes/operons in the metabolic pathway: DPA was initially transformed to aniline and catechol by a biphenyl dioxygenase (DPA-dioxygenase); aniline was then transformed to catechol which was further metabolized via the ortho-cleavage pathway. Plasmid curing of P. putida resulted in loss of the DPA and aniline dioxygenase genes and the corresponding degradation capacities. Overall our findings provide novel insights into the evolution of the DPA degradation pathway and suggests that the degradation capacity of P. putida was acquired through recruitment of the bph and tdn operons via horizontal gene transfer.
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Affiliation(s)
- Evangelia S Papadopoulou
- Department of Biochemistry and Biotechnology, Laboratory of Plant and Environmental Biotechnology, University of Thessaly, Larissa, Greece
| | - Chiara Perruchon
- Department of Biochemistry and Biotechnology, Laboratory of Plant and Environmental Biotechnology, University of Thessaly, Larissa, Greece
| | - Sotirios Vasileiadis
- Department of Biochemistry and Biotechnology, Laboratory of Plant and Environmental Biotechnology, University of Thessaly, Larissa, Greece
| | - Constantina Rousidou
- Department of Biochemistry and Biotechnology, Laboratory of Plant and Environmental Biotechnology, University of Thessaly, Larissa, Greece
| | - Georgia Tanou
- School of Agriculture, Aristotle University of Thessaloniki, Thessaloniki, Greece
| | - Martina Samiotaki
- Biomedical Sciences Research Center "Alexander Fleming", Vari, Greece
| | | | - Dimitrios G Karpouzas
- Department of Biochemistry and Biotechnology, Laboratory of Plant and Environmental Biotechnology, University of Thessaly, Larissa, Greece
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10
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Characterization of the biodegradation, bioremediation and detoxification capacity of a bacterial consortium able to degrade the fungicide thiabendazole. Biodegradation 2017; 28:383-394. [DOI: 10.1007/s10532-017-9803-z] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/06/2017] [Accepted: 07/19/2017] [Indexed: 10/19/2022]
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11
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Perruchon C, Chatzinotas A, Omirou M, Vasileiadis S, Menkissoglou-Spiroudi U, Karpouzas DG. Isolation of a bacterial consortium able to degrade the fungicide thiabendazole: the key role of a Sphingomonas phylotype. Appl Microbiol Biotechnol 2017; 101:3881-3893. [DOI: 10.1007/s00253-017-8128-5] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/15/2016] [Revised: 01/09/2017] [Accepted: 01/12/2017] [Indexed: 11/30/2022]
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12
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Karas PA, Perruchon C, Karanasios E, Papadopoulou ES, Manthou E, Sitra S, Ehaliotis C, Karpouzas DG. Integrated biodepuration of pesticide-contaminated wastewaters from the fruit-packaging industry using biobeds: Bioaugmentation, risk assessment and optimized management. JOURNAL OF HAZARDOUS MATERIALS 2016; 320:635-644. [PMID: 27501880 DOI: 10.1016/j.jhazmat.2016.07.071] [Citation(s) in RCA: 29] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/10/2016] [Revised: 07/02/2016] [Accepted: 07/29/2016] [Indexed: 06/06/2023]
Abstract
Wastewaters from fruit-packaging plants contain high loads of toxic and persistent pesticides and should be treated on site. We evaluated the depuration performance of five pilot biobeds against those effluents. In addition we tested bioaugmentation with bacterial inocula as a strategy for optimization of their depuration capacity. Finally we determined the composition and functional dynamics of the microbial community via q-PCR. Practical issues were also addressed including the risk associated with the direct environmental disposal of biobed-treated effluents and decontamination methods for the spent packing material. Biobeds showed high depuration capacity (>99.5%) against all pesticides with bioaugmentation maximizing their depuration performance against the persistent fungicide thiabendazole (TBZ). This was followed by a significant increase in the abundance of bacteria, fungi and of catabolic genes of aromatic compounds catA and pcaH. Bioaugmentation was the most potent decontamination method for spent packing material with composting being an effective alternative. Risk assessment based on practical scenarios (pome and citrus fruit-packaging plants) and the depuration performance of the pilot biobeds showed that discharge of the treated effluents into an 0.1-ha disposal site did not entail an environmental risk, except for TBZ-containing effluents where a larger disposal area (0.2ha) or bioaugmentation alleviated the risk.
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Affiliation(s)
- Panagiotis A Karas
- University of Thessaly, Department of Biochemistry and Biotechnology, Ploutonos 26 and Aiolou, 41221 Larissa, Greece
| | - Chiara Perruchon
- University of Thessaly, Department of Biochemistry and Biotechnology, Ploutonos 26 and Aiolou, 41221 Larissa, Greece
| | | | - Evangelia S Papadopoulou
- University of Thessaly, Department of Biochemistry and Biotechnology, Ploutonos 26 and Aiolou, 41221 Larissa, Greece
| | - Elena Manthou
- University of Thessaly, Department of Biochemistry and Biotechnology, Ploutonos 26 and Aiolou, 41221 Larissa, Greece
| | - Stefania Sitra
- University of Thessaly, Department of Biochemistry and Biotechnology, Ploutonos 26 and Aiolou, 41221 Larissa, Greece
| | - Constantinos Ehaliotis
- Agricultural University of Athens, Department of Natural Resources and Agricultural Engineering, Laboratory of Soils and Agricultural Chemistry, 75 IeraOdos Str., 11855 Athens, Greece
| | - Dimitrios G Karpouzas
- University of Thessaly, Department of Biochemistry and Biotechnology, Ploutonos 26 and Aiolou, 41221 Larissa, Greece.
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