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González Álvarez Á, Martinez I Quer A, Ellegaard-Jensen L, Sapkota R, Carvalho PN, Johansen A. Fungal removal of cyanotoxins in constructed wetlands: The forgotten degraders. THE SCIENCE OF THE TOTAL ENVIRONMENT 2024; 929:172590. [PMID: 38642746 DOI: 10.1016/j.scitotenv.2024.172590] [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: 01/26/2024] [Revised: 04/14/2024] [Accepted: 04/17/2024] [Indexed: 04/22/2024]
Abstract
Harmful cyanobacterial blooms have increased globally, releasing hazardous cyanotoxins that threaten the safety of water resources. Constructed wetlands (CWs) are a nature-based and low-cost solution to purify and remove cyanotoxins from water. However, bio-mechanistic understanding of the biotransformation processes expected to drive cyanotoxin removal in such systems is poor, and primarily focused on bacteria. Thus, the present study aimed at exploring the fungal contribution to microcystin-LR and cylindrospermopsin biodegradation in CWs. Based on CW mesocosms, two experimental approaches were taken: a) amplicon sequencing studies were conducted to investigate the involvement of the fungal community; and b) CW fungal isolates were tested for their microcystin-LR and cylindrospermopsin degradation capabilities. The data uncovered effects of seasonality (spring or summer), cyanotoxin exposure, vegetation (unplanted, Juncus effusus or Phragmites australis) and substratum (sand or gravel) on the fungal community structure. Additionally, the arbuscular mycorrhizal fungus Rhizophagus and the endophyte Myrmecridium showed positive correlations with cyanotoxin removal. Fungal isolates revealed microcystin-LR-removal potentials of approximately 25 % in in vitro biodegradation experiments, while the extracellular chemical fingerprint of the cultures suggested a potential intracellular metabolization. The results from this study may help us understand the fungal contribution to cyanotoxin removal, as well as their ecology in CWs.
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Affiliation(s)
- Ángela González Álvarez
- Department of Environmental Science, Aarhus University, Frederiksborgvej 399, 4000 Roskilde, Denmark
| | - Alba Martinez I Quer
- Department of Environmental Science, Aarhus University, Frederiksborgvej 399, 4000 Roskilde, Denmark
| | - Lea Ellegaard-Jensen
- Department of Environmental Science, Aarhus University, Frederiksborgvej 399, 4000 Roskilde, Denmark; WATEC, Centre for Water Technology, Aarhus University, Ny Munkegade 120, 8000 Aarhus C, Denmark
| | - Rumakanta Sapkota
- Department of Environmental Science, Aarhus University, Frederiksborgvej 399, 4000 Roskilde, Denmark
| | - Pedro N Carvalho
- Department of Environmental Science, Aarhus University, Frederiksborgvej 399, 4000 Roskilde, Denmark; WATEC, Centre for Water Technology, Aarhus University, Ny Munkegade 120, 8000 Aarhus C, Denmark.
| | - Anders Johansen
- Department of Environmental Science, Aarhus University, Frederiksborgvej 399, 4000 Roskilde, Denmark; WATEC, Centre for Water Technology, Aarhus University, Ny Munkegade 120, 8000 Aarhus C, Denmark
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Raklami A, Babalola OO, Jemo M, Nafis A. Unlocking the plant growth-promoting potential of yeast spp.: exploring species from the Moroccan extremophilic environment for enhanced plant growth and sustainable farming. FEMS Microbiol Lett 2024; 371:fnae015. [PMID: 38419295 PMCID: PMC10950045 DOI: 10.1093/femsle/fnae015] [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: 10/17/2023] [Revised: 01/18/2024] [Accepted: 02/27/2024] [Indexed: 03/02/2024] Open
Abstract
In this study, we successfully isolated two distinct yeasts from Moroccan extreme environments. These yeasts were subjected to molecular characterization by analyzing their Internal Transcribed spacer (ITS) regions. Our research thoroughly characterizes plant growth-promoting abilities and their drought and salt stress tolerance. In a greenhouse assay, we examined the impact of selected yeasts on Medicago sativa's growth. Four treatments were employed: (i) control without inoculation (NI), (ii) inoculation with L1, (iii) inoculation with L2, and (iv) inoculation with the mixture L1 + L2. L1 isolated from Toubkal Mountain shared 99.83% sequence similarity to Rhodotorula mucilaginosa. Meanwhile, L2, thriving in the arid Merzouga desert, displayed a similar identity to Naganishia albida (99.84%). Yeast strains were tolerant to NaCl (2 M) and 60% PEG (polyethylene glycol P6000) in case of drought. Both strains could solubilize phsphorus, with L2 additionally demonstrating potassium solubilization. In addition, both strains produce indole acetic acid (up to 135 µl ml-1), have siderophore ability, and produce aminocyclopropane-1-carboxylic acid deaminase. Isolates L1 and L2, and their consortium showed that the single or combined strain inoculation of M. sativa improved plant growth, development, and nutrient assimilation. These findings pave the way for harnessing yeast-based solutions in agricultural practices, contributing to enhanced crop productivity and environmental sustainability.
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Affiliation(s)
- Anas Raklami
- AgroBiosciences Program, College of Sustainable Agriculture and Environmental Sciences (CAES), Mohammed VI Polytechnic University (UM6P), Lot 660, Hay Moulay Rachid, Benguerir 43150, Morocco
| | - Olubukola Oluranti Babalola
- Food Security and Safety Focus Area, Faculty of Natural and Agricultural Sciences, North-West University, Private Bag X2046, Mmabatho 2735, South Africa
| | - Martin Jemo
- AgroBiosciences Program, College of Sustainable Agriculture and Environmental Sciences (CAES), Mohammed VI Polytechnic University (UM6P), Lot 660, Hay Moulay Rachid, Benguerir 43150, Morocco
| | - Ahmed Nafis
- Microbiology and Antimicrobial Agents Team, Laboratory of Plant Biotechnology, Ecology and Valorization of Ecosystems (LB2VE/URL-CNRST n°10), Faculty of Sciences, Chouaïb Doukkali University, El Jadida 24000, Morocco
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Banerjee S, Gupta N, Pramanik K, Gope M, GhoshThakur R, Karmakar A, Gogoi N, Hoque RR, Mandal NC, Balachandran S. Microbes and microbial strategies in carcinogenic polycyclic aromatic hydrocarbons remediation: a systematic review. ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH INTERNATIONAL 2024; 31:1811-1840. [PMID: 38063960 DOI: 10.1007/s11356-023-31140-0] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/20/2023] [Accepted: 11/16/2023] [Indexed: 01/18/2024]
Abstract
Degradation, detoxification, or removal of the omnipresent polycyclic aromatic hydrocarbons (PAHs) from the ecosphere as well as their prevention from entering into food chain has never appeared simple. In this context, cost-effective, eco-friendly, and sustainable solutions like microbe-mediated strategies have been adopted worldwide. With this connection, measures have been taken by multifarious modes of microbial remedial strategies, i.e., enzymatic degradation, biofilm and biosurfactant production, application of biochar-immobilized microbes, lactic acid bacteria, rhizospheric-phyllospheric-endophytic microorganisms, genetically engineered microorganisms, and bioelectrochemical techniques like microbial fuel cell. In this review, a nine-way directional approach which is based on the microbial resources reported over the last couple of decades has been described. Fungi were found to be the most dominant taxa among the CPAH-degrading microbial community constituting 52.2%, while bacteria, algae, and yeasts occupied 37.4%, 9.1%, and 1.3%, respectively. In addition to these, category-wise CPAH degrading efficiencies of each microbial taxon, consortium-based applications, CPAH degradation-related molecular tools, and factors affecting CPAH degradation are the other important aspects of this review in light of their appropriate selection and application in the PAH-contaminated environment for better human-health management in order to achieve a sustainable ecosystem.
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Affiliation(s)
- Sandipan Banerjee
- Mycology and Plant Pathology Laboratory, Department of Botany, Visva-Bharati, Santiniketan, 731235, West Bengal, India
| | - Nitu Gupta
- Department of Environmental Science, Tezpur University, Napaam, Tezpur, Assam, 784028, India
| | - Krishnendu Pramanik
- Microbiology and Microbial Bioinformatics Laboratory, Department of Botany, Cooch Behar Panchanan Barma University, Panchanan Nagar, Vivekananda Street, Cooch Behar, 736101, West Bengal, India
| | - Manash Gope
- Department of Environmental Science, The University of Burdwan, Golapbag, 713104, West Bengal, India
| | - Richik GhoshThakur
- Department of Environmental Studies, Visva-Bharati, Santiniketan, 731235, West Bengal, India
| | - Animesh Karmakar
- Department of Chemistry, Visva-Bharati, Santiniketan, 731235, West Bengal, India
| | - Nayanmoni Gogoi
- Department of Environmental Science, Tezpur University, Napaam, Tezpur, Assam, 784028, India
| | - Raza Rafiqul Hoque
- Department of Environmental Science, Tezpur University, Napaam, Tezpur, Assam, 784028, India
| | - Narayan Chandra Mandal
- Mycology and Plant Pathology Laboratory, Department of Botany, Visva-Bharati, Santiniketan, 731235, West Bengal, India
| | - Srinivasan Balachandran
- Department of Environmental Studies, Visva-Bharati, Santiniketan, 731235, West Bengal, India.
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Wang X, Teng Y, Wang X, Xu Y, Li R, Sun Y, Dai S, Hu W, Wang H, Li Y, Fang Y, Luo Y. Nitrogen transfer and cross-feeding between Azotobacter chroococcum and Paracoccus aminovorans promotes pyrene degradation. THE ISME JOURNAL 2023; 17:2169-2181. [PMID: 37775536 PMCID: PMC10689768 DOI: 10.1038/s41396-023-01522-w] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/22/2023] [Revised: 09/18/2023] [Accepted: 09/20/2023] [Indexed: 10/01/2023]
Abstract
Nitrogen is a limiting nutrient for degraders function in hydrocarbon-contaminated environments. Biological nitrogen fixation by diazotrophs is a natural solution for supplying bioavailable nitrogen. Here, we determined whether the diazotroph Azotobacter chroococcum HN can provide nitrogen to the polycyclic aromatic hydrocarbon-degrading bacterium Paracoccus aminovorans HPD-2 and further explored the synergistic interactions that facilitate pyrene degradation in nitrogen-deprived environments. We found that A. chroococcum HN and P. aminovorans HPD-2 grew and degraded pyrene more quickly in co-culture than in monoculture. Surface-enhanced Raman spectroscopy combined with 15N stable isotope probing (SERS - 15N SIP) demonstrated that A. chroococcum HN provided nitrogen to P. aminovorans HPD-2. Metabolite analysis and feeding experiments confirmed that cross-feeding occurred between A. chroococcum HN and P. aminovorans HPD-2 during pyrene degradation. Transcriptomic and metabolomic analyses further revealed that co-culture significantly upregulated key pathways such as nitrogen fixation, aromatic compound degradation, protein export, and the TCA cycle in A. chroococcum HN and quorum sensing, aromatic compound degradation and ABC transporters in P. aminovorans HPD-2. Phenotypic and fluorescence in situ hybridization (FISH) assays demonstrated that A. chroococcum HN produced large amounts of biofilm and was located at the bottom of the biofilm in co-culture, whereas P. aminovorans HPD-2 attached to the surface layer and formed a bridge-like structure with A. chroococcum HN. This study demonstrates that distinct syntrophic interactions occur between A. chroococcum HN and P. aminovorans HPD-2 and provides support for their combined use in organic pollutant degradation in nitrogen-deprived environments.
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Affiliation(s)
- Xia Wang
- Key Laboratory of Soil Environment and Pollution Remediation, Institute of Soil Science, Chinese Academy of Sciences, Nanjing, 210008, China
- University of the Chinese Academy of Sciences, 100049, Beijing, China
| | - Ying Teng
- Key Laboratory of Soil Environment and Pollution Remediation, Institute of Soil Science, Chinese Academy of Sciences, Nanjing, 210008, China.
- University of the Chinese Academy of Sciences, 100049, Beijing, China.
| | - Xiaomi Wang
- Key Laboratory of Soil Environment and Pollution Remediation, Institute of Soil Science, Chinese Academy of Sciences, Nanjing, 210008, China
- University of the Chinese Academy of Sciences, 100049, Beijing, China
| | - Yongfeng Xu
- Key Laboratory of Soil Environment and Pollution Remediation, Institute of Soil Science, Chinese Academy of Sciences, Nanjing, 210008, China
- University of the Chinese Academy of Sciences, 100049, Beijing, China
| | - Ran Li
- Key Laboratory of Soil Environment and Pollution Remediation, Institute of Soil Science, Chinese Academy of Sciences, Nanjing, 210008, China
- University of the Chinese Academy of Sciences, 100049, Beijing, China
| | - Yi Sun
- Key Laboratory of Soil Environment and Pollution Remediation, Institute of Soil Science, Chinese Academy of Sciences, Nanjing, 210008, China
- University of the Chinese Academy of Sciences, 100049, Beijing, China
| | - Shixiang Dai
- Key Laboratory of Soil Environment and Pollution Remediation, Institute of Soil Science, Chinese Academy of Sciences, Nanjing, 210008, China
- University of the Chinese Academy of Sciences, 100049, Beijing, China
| | - Wenbo Hu
- Key Laboratory of Soil Environment and Pollution Remediation, Institute of Soil Science, Chinese Academy of Sciences, Nanjing, 210008, China
- University of the Chinese Academy of Sciences, 100049, Beijing, China
| | - Hongzhe Wang
- Key Laboratory of Soil Environment and Pollution Remediation, Institute of Soil Science, Chinese Academy of Sciences, Nanjing, 210008, China
- University of the Chinese Academy of Sciences, 100049, Beijing, China
| | - Yanning Li
- Key Laboratory of Soil Environment and Pollution Remediation, Institute of Soil Science, Chinese Academy of Sciences, Nanjing, 210008, China
- University of the Chinese Academy of Sciences, 100049, Beijing, China
| | - Yan Fang
- University of the Chinese Academy of Sciences, 100049, Beijing, China
- Institute of Geology and Palaeontology, Chinese Academy of Sciences, Nanjing, 210008, China
| | - Yongming Luo
- Key Laboratory of Soil Environment and Pollution Remediation, Institute of Soil Science, Chinese Academy of Sciences, Nanjing, 210008, China
- University of the Chinese Academy of Sciences, 100049, Beijing, China
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Abstract
Hypersaline waters and glacial ice are inhospitable environments that have low water activity and high concentrations of osmolytes. They are inhabited by diverse microbial communities, of which extremotolerant and extremophilic fungi are essential components. Some fungi are specialized in only one of these two environments and can thrive in conditions that are lethal to most other life-forms. Others are generalists, highly adaptable species that occur in both environments and tolerate a wide range of extremes. Both groups efficiently balance cellular osmotic pressure and ion concentration, stabilize cell membranes, remodel cell walls, and neutralize intracellular oxidative stress. Some species use unusual reproductive strategies. Further investigation of these adaptations with new methods and carefully designed experiments under ecologically relevant conditions will help predict the role of fungi in hypersaline and glacial environments affected by climate change, decipher their stress resistance mechanisms and exploit their biotechnological potential.
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Affiliation(s)
- Cene Gostinčar
- Department of Biology, Biotechnical Faculty, University of Ljubljana, Ljubljana, Slovenia; ,
| | - Nina Gunde-Cimerman
- Department of Biology, Biotechnical Faculty, University of Ljubljana, Ljubljana, Slovenia; ,
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Moreno-Perlin T, Valdés-Muñoz G, Jiménez-Gómez I, Gunde-Cimerman N, Yarzábal Rodríguez LA, Sánchez-Carbente MDR, Vargas-Fernández A, Gutiérrez-Cepeda A, Batista-García RA. Extremely chaotolerant and kosmotolerant Aspergillus atacamensis - a metabolically versatile fungus suitable for recalcitrant biosolid treatment. Front Microbiol 2023; 14:1191312. [PMID: 37455742 PMCID: PMC10338856 DOI: 10.3389/fmicb.2023.1191312] [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: 03/21/2023] [Accepted: 05/09/2023] [Indexed: 07/18/2023] Open
Abstract
Obligate halophily is extremely rare in fungi. Nevertheless, Aspergillus atacamensis (strain EXF-6660), isolated from a salt water-exposed cave in the Coastal Range hills of the hyperarid Atacama Desert in Chile, is an obligate halophile, with a broad optimum range from 1.5 to 3.4 M of NaCl. When we tested its ability to grow at varied concentrations of both kosmotropic (NaCl, KCl, and sorbitol) and chaotropic (MgCl2, LiCl, CaCl2, and glycerol) solutes, stereoscopy and laser scanning microscopy revealed the formation of phialides and conidia. A. atacamensis EXF-6660 grew up to saturating levels of NaCl and at 2.0 M concentration of the chaotropic salt MgCl2. Our findings confirmed that A. atacamensis is an obligate halophile that can grow at substantially higher MgCl2 concentrations than 1.26 M, previously considered as the maximum limit supporting prokaryotic life. To assess the fungus' metabolic versatility, we used the phenotype microarray technology Biolog FF MicroPlates. In the presence of 2.0 M NaCl concentration, strain EXF-6660 metabolism was highly versatile. A vast repertoire of organic molecules (~95% of the substrates present in Biolog FF MicroPlates) was metabolized when supplied as sole carbon sources, including numerous polycyclic aromatic hydrocarbons, benzene derivatives, dyes, and several carbohydrates. Finally, the biotechnological potential of A. atacamensis for xenobiotic degradation and biosolid treatment was investigated. Interestingly, it could remove biphenyls, diphenyl ethers, different pharmaceuticals, phenols, and polyaromatic hydrocarbons. Our combined findings show that A. atacamensis EXF-6660 is a highly chaotolerant, kosmotolerant, and xerotolerant fungus, potentially useful for xenobiotic and biosolid treatments.
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Affiliation(s)
- Tonatiuh Moreno-Perlin
- Centro de Investigación en Dinámica Celular, Instituto de Investigación en Ciencias Básicas y Aplicadas, Universidad Autónoma del Estado de Morelos, Cuernavaca, Morelos, Mexico
| | - Gisell Valdés-Muñoz
- Centro de Investigación en Dinámica Celular, Instituto de Investigación en Ciencias Básicas y Aplicadas, Universidad Autónoma del Estado de Morelos, Cuernavaca, Morelos, Mexico
| | - Irina Jiménez-Gómez
- Centro de Investigación en Dinámica Celular, Instituto de Investigación en Ciencias Básicas y Aplicadas, Universidad Autónoma del Estado de Morelos, Cuernavaca, Morelos, Mexico
| | - Nina Gunde-Cimerman
- Department of Biology, Biotechnical Faculty, University of Ljubljana, Ljubljana, Slovenia
| | | | | | - Alfaniris Vargas-Fernández
- Instituto de Investigación en Salud, Facultad de Ciencias de la Salud, Universidad Autónoma de Santo Domingo, Santo Domingo, Dominican Republic
- Instituto de Química, Facultad de Ciencias, Universidad Autónoma de Santo Domingo, Santo Domingo, Dominican Republic
| | - Adrián Gutiérrez-Cepeda
- Instituto de Investigación en Salud, Facultad de Ciencias de la Salud, Universidad Autónoma de Santo Domingo, Santo Domingo, Dominican Republic
- Instituto de Química, Facultad de Ciencias, Universidad Autónoma de Santo Domingo, Santo Domingo, Dominican Republic
| | - Ramón Alberto Batista-García
- Centro de Investigación en Dinámica Celular, Instituto de Investigación en Ciencias Básicas y Aplicadas, Universidad Autónoma del Estado de Morelos, Cuernavaca, Morelos, Mexico
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Bonatti E, Dos Santos A, Birolli WG, Rodrigues-Filho E. Endophytic, extremophilic and entomophilic fungi strains biodegrade anthracene showing potential for bioremediation. World J Microbiol Biotechnol 2023; 39:152. [PMID: 37029326 DOI: 10.1007/s11274-023-03590-8] [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: 09/29/2022] [Accepted: 03/21/2023] [Indexed: 04/09/2023]
Abstract
Anthropogenic activities have been increasing Polycyclic Aromatic Hydrocarbons (PAHs) release, promoting an urgent need for decontamination methods. Therefore, anthracene biodegradation by endophytic, extremophilic, and entomophilic fungi was studied. Moreover, a salting-out extraction methodology with the renewable solvent ethanol and the innocuous salt K2HPO4 was employed. Nine of the ten employed strains biodegraded anthracene in liquid medium (19-56% biodegradation) after 14 days at 30 °C, 130 rpm, and 100 mg L-1. The most efficient strain Didymellaceae sp. LaBioMMi 155, an entomophilic strain, was employed for optimized biodegradation, aiming at a better understanding of how factors like pollutant initial concentration, pH, and temperature affected this process. Biodegradation reached 90 ± 11% at 22 °C, pH 9.0, and 50 mg L-1. Futhermore, 8 different PAHs were biodegraded and metabolites were identified. Then, experiments with anthracene in soil ex situ were performed and bioaugmentation with Didymellaceae sp. LaBioMMi 155 presented better results than natural attenuation by the native microbiome and biostimulation by the addition of liquid nutrient medium into soil. Therefore, an expanded knowledge about PAHs biodegradation processes was achieved with emphasis to the action of Didymellaceae sp. LaBioMMi 155, which can be further employed for in situ biodegradation (after strain security test), or for enzyme identification and isolation aiming at oxygenases with optimal activity under alkaline conditions.
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Affiliation(s)
- Erika Bonatti
- Laboratory of Micromolecular Biochemistry of Microorganisms (LaBioMMi), Center for Exact Sciences and Technology, Federal University of São Carlos, Via Washington Luiz, Km 235, P.O. Box 676, São Carlos, SP, 13.565-905, Brazil
| | - Alef Dos Santos
- Laboratory of Micromolecular Biochemistry of Microorganisms (LaBioMMi), Center for Exact Sciences and Technology, Federal University of São Carlos, Via Washington Luiz, Km 235, P.O. Box 676, São Carlos, SP, 13.565-905, Brazil
| | - Willian Garcia Birolli
- Laboratory of Micromolecular Biochemistry of Microorganisms (LaBioMMi), Center for Exact Sciences and Technology, Federal University of São Carlos, Via Washington Luiz, Km 235, P.O. Box 676, São Carlos, SP, 13.565-905, Brazil.
| | - Edson Rodrigues-Filho
- Laboratory of Micromolecular Biochemistry of Microorganisms (LaBioMMi), Center for Exact Sciences and Technology, Federal University of São Carlos, Via Washington Luiz, Km 235, P.O. Box 676, São Carlos, SP, 13.565-905, Brazil.
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Nieto EE, Macchi M, Valacco MP, Festa S, Morelli IS, Coppotelli BM. Metaproteomic and gene expression analysis of interspecies interactions in a PAH-degrading synthetic microbial consortium constructed with the key microbes of a natural consortium. Biodegradation 2023; 34:181-197. [PMID: 36596914 DOI: 10.1007/s10532-022-10012-3] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/09/2022] [Accepted: 12/19/2022] [Indexed: 01/05/2023]
Abstract
Polycyclic Aromatic Hydrocarbons (PAHs) impose adverse effects on the environment and human life. The use of synthetic microbial consortia is promising in bioremediation of contaminated sites with these pollutants. However, the design of consortia taking advantage of natural interactions has been poorly explored. In this study, a dual synthetic bacterial consortium (DSC_AB) was constructed with two key members (Sphingobium sp. AM and Burkholderia sp. Bk), of a natural PAH degrading consortium. DSC_AB showed significantly enhanced degradation of PAHs and toxic intermediary metabolites relative to the axenic cultures, indicating the existence of synergistic relationships. Metaproteomic and gene-expression analyses were applied to obtain a view of bacterial performance during phenanthrene removal. Overexpression of the Bk genes, naph, biph, tol and sal and the AM gene, ahdB, in DSC_AB relative to axenic cultures, demonstrated that both strains are actively participating in degradation, which gave evidence of cross-feeding. Several proteins related to stress response were under-expressed in DSC_AB relative to axenic cultures, indicating that the division of labour reduces cellular stress, increasing the efficiency of degradation. This is the one of the first works revealing bacterial relationships during PAH removal in a synthetic consortium applying an omics approach. Our findings could be used to develop criteria for evaluating the potential effectiveness of synthetic bacterial consortia in bioremediation.
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Affiliation(s)
- Esteban E Nieto
- Centro de Investigación y Desarrollo en Fermentaciones Industriales, CINDEFI (UNLP; CCT-La Plata, CONICET), Street 50 N°227, 1900, La Plata, Argentina
| | - Marianela Macchi
- Centro de Investigación y Desarrollo en Fermentaciones Industriales, CINDEFI (UNLP; CCT-La Plata, CONICET), Street 50 N°227, 1900, La Plata, Argentina
| | - María P Valacco
- Instituto de Química Biológica de la Facultad de Ciencias Exactas y Naturales IQUIBICEN, FCEN-UBA, Buenos Aires, Argentina
| | - Sabrina Festa
- Centro de Investigación y Desarrollo en Fermentaciones Industriales, CINDEFI (UNLP; CCT-La Plata, CONICET), Street 50 N°227, 1900, La Plata, Argentina
| | - Irma S Morelli
- Centro de Investigación y Desarrollo en Fermentaciones Industriales, CINDEFI (UNLP; CCT-La Plata, CONICET), Street 50 N°227, 1900, La Plata, Argentina.,Comisión de Investigaciones Científicas de la Provincia de Buenos Aires, La Plata, Argentina
| | - Bibiana M Coppotelli
- Centro de Investigación y Desarrollo en Fermentaciones Industriales, CINDEFI (UNLP; CCT-La Plata, CONICET), Street 50 N°227, 1900, La Plata, Argentina.
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9
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Zhang X, Wang X, Li Y, Ning G, Zhang Q, Zhang X, Zheng W, Yang Z. Differences in adsorption, transmembrane transport and degradation of pyrene and benzo[a]pyrene by Bacillus sp. strain M1. ECOTOXICOLOGY AND ENVIRONMENTAL SAFETY 2022; 248:114328. [PMID: 36436257 DOI: 10.1016/j.ecoenv.2022.114328] [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: 06/11/2022] [Revised: 11/02/2022] [Accepted: 11/21/2022] [Indexed: 06/16/2023]
Abstract
In a previous study our group identified Bacillus sp. strain M1 as an efficient decomposer of high molecular weight-polycyclic aromatic hydrocarbons (HMW-PAHs). Interestingly, its removal efficiency for benzo[a]pyrene (BaP) was nearly double that of pyrene (Pyr), which was the reverse of what is reported for most other species. Here we compared the differential steps of biosorption, transmembrane transport and biodegradation of Pyr and BaP by strain M1 in order to assist in targeted selection of dominant strains and their degradation efficiency in the remediation of these two HMW-PAHs. The overall biosorption efficiency for BaP was 19% higher than that for Pyr, and the time needed to reach BaP peak adsorption efficiency was 4 days shorter than for Pyr. Transmembrane transport of the PAHs was compared in presence of sodium azide which inhibits ATP synthesis and metabolism. This indicated that both Pyr and BaP entered the cells by the same means of passive transport. Biodegradation of Pyr and BaP did not differ in the early stage of culture, but around days 5-7, the biodegradation efficiency of BaP was significantly (30-61%) higher than that of Pyr. Key enzymes involved in these processes were identified and their activity differed, with intracellular gentisate 1,2-dioxygenase and extracellular polyphenol oxidase as likely candidates to be involved in BaP degradation, while intracellular catechol-1,2- dioxygenase and salicylate hydroxylase are more likely involved in Pyr degradation. These results provide new insights for sustainable environmental remediation of pyrene and benzo(a)pyrene by these bacteria.
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Affiliation(s)
- Xiaoxue Zhang
- College of Resource and Environmental Sciences, Agricultural University of Hebei, Baoding 0710001, Hebei Province, PR China; Key Laboratory for Farmland Eco-Environment, Baoding 0710001, Hebei Province, PR China
| | - Xiaomin Wang
- College of Resource and Environmental Sciences, Agricultural University of Hebei, Baoding 0710001, Hebei Province, PR China; Key Laboratory for Farmland Eco-Environment, Baoding 0710001, Hebei Province, PR China
| | - Yan Li
- College of Resource and Environmental Sciences, Agricultural University of Hebei, Baoding 0710001, Hebei Province, PR China; Key Laboratory for Farmland Eco-Environment, Baoding 0710001, Hebei Province, PR China
| | - Guohui Ning
- College of Resource and Environmental Sciences, Agricultural University of Hebei, Baoding 0710001, Hebei Province, PR China; Key Laboratory for Farmland Eco-Environment, Baoding 0710001, Hebei Province, PR China
| | - Qian Zhang
- College of Resource and Environmental Sciences, Agricultural University of Hebei, Baoding 0710001, Hebei Province, PR China; Key Laboratory for Farmland Eco-Environment, Baoding 0710001, Hebei Province, PR China
| | - Xuena Zhang
- College of Resource and Environmental Sciences, Agricultural University of Hebei, Baoding 0710001, Hebei Province, PR China; Key Laboratory for Farmland Eco-Environment, Baoding 0710001, Hebei Province, PR China
| | - Wei Zheng
- College of Resource and Environmental Sciences, Agricultural University of Hebei, Baoding 0710001, Hebei Province, PR China; Key Laboratory for Farmland Eco-Environment, Baoding 0710001, Hebei Province, PR China; State Key Laboratory of North China Crop Improvement and Regulation, Hebei Agricultural University, Baoding 071001, Hebei, PR China
| | - Zhixin Yang
- College of Resource and Environmental Sciences, Agricultural University of Hebei, Baoding 0710001, Hebei Province, PR China; Key Laboratory for Farmland Eco-Environment, Baoding 0710001, Hebei Province, PR China; State Key Laboratory of North China Crop Improvement and Regulation, Hebei Agricultural University, Baoding 071001, Hebei, PR China.
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DhDIT2 Encodes a Debaryomyces hansenii Cytochrome P450 Involved in Benzo(a)pyrene Degradation-A Proposal for Mycoremediation. J Fungi (Basel) 2022; 8:jof8111150. [PMID: 36354917 PMCID: PMC9698926 DOI: 10.3390/jof8111150] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/22/2022] [Revised: 10/25/2022] [Accepted: 10/26/2022] [Indexed: 11/17/2022] Open
Abstract
Pollutants, such as polycyclic aromatic hydrocarbons (PAHs), e.g., benzo(a)pyrene (BaP), are common components of contaminating mixtures. Such compounds are ubiquitous, extremely toxic, and they pollute soils and aquatic niches. The need for new microorganism-based remediation strategies prompted researchers to identify the most suitable organisms to eliminate pollutants without interfering with the ecosystem. We analyzed the effect caused by BaP on the growth properties of Candida albicans, Debaryomyces hansenii, Rhodotorula mucilaginosa, and Saccharomyces cerevisiae. Their ability to metabolize BaP was also evaluated. The aim was to identify an optimal candidate to be used as the central component of a mycoremediation strategy. The results show that all four yeast species metabolized BaP by more than 70%, whereas their viability was not affected. The best results were observed for D. hansenii. When an incubation was performed in the presence of a cytochrome P450 (CYP) inhibitor, no BaP degradation was observed. Thus, the initial oxidation step is mediated by a CYP enzyme. Additionally, this study identified the D. hansenii DhDIT2 gene as essential to perform the initial degradation of BaP. Hence, we propose that D. hansenii and a S. cerevisiae expressing the DhDIT2 gene are suitable candidates to degrade BaP in contaminated environments.
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11
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Luo C, Hu X, Bao M, Sun X, Li F, Li Y, Liu W, Yang Y. Efficient biodegradation of phenanthrene using Pseudomonas stutzeri LSH-PAH1 with the addition of sophorolipids: Alleviation of biotoxicity and cometabolism studies. ENVIRONMENTAL POLLUTION (BARKING, ESSEX : 1987) 2022; 301:119011. [PMID: 35182655 DOI: 10.1016/j.envpol.2022.119011] [Citation(s) in RCA: 14] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/07/2021] [Revised: 02/04/2022] [Accepted: 02/14/2022] [Indexed: 06/14/2023]
Abstract
Phenanthrene (PHE) is widely distributed, and it can cause genotoxicity in humans by interacting with enzymes in the body. A current challenge for PHE bioremediation is the inhibitory effect of biotoxic intermediates on bacterial growth. Notably, the aerobic biotransformation processes for PHE in the presence of sophorolipids have been poorly studied. Here, a PHE-degrading strain was isolated from sediments and identified as Pseudomonas stutzeri and named LSH-PAH1. It was observed that 1-naphthol (a biotoxic substance that can inhibit strain growth) was produced during the PHE metabolism process of LSH-PAH1. The biodegradation ratio increased from 21.4% to 91.7% within 48 h after the addition of sophorolipids. Unexpectedly, this addition accelerated the metabolic process for 1-naphthol rather than causing its accumulation. The cometabolism of 1-naphthol and sophorolipids alleviated the biotoxic effects for the strain, which was verified by gene expression analysis. We identified a new PHE-degrading strain and provided a mechanism for PHE biodegradation using LSH-PAH1 with the addition of sophorolipids, which provides a reference for practical applications of the bioremediation of PHE and study of the cometabolism of biotoxic intermediates.
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Affiliation(s)
- Chengyi Luo
- Frontiers Science Center for Deep Ocean Multispheres and Earth System, And Key Laboratory of Marine Chemistry Theory and Technology, Ministry of Education, Ocean University of China, Qingdao, 266100, China; College of Chemistry & Chemical Engineering, Ocean University of China, Qingdao, 266100, PR China
| | - Xin Hu
- Frontiers Science Center for Deep Ocean Multispheres and Earth System, And Key Laboratory of Marine Chemistry Theory and Technology, Ministry of Education, Ocean University of China, Qingdao, 266100, China; College of Chemistry & Chemical Engineering, Ocean University of China, Qingdao, 266100, PR China
| | - Mutai Bao
- Frontiers Science Center for Deep Ocean Multispheres and Earth System, And Key Laboratory of Marine Chemistry Theory and Technology, Ministry of Education, Ocean University of China, Qingdao, 266100, China; College of Chemistry & Chemical Engineering, Ocean University of China, Qingdao, 266100, PR China.
| | - Xiaojun Sun
- Frontiers Science Center for Deep Ocean Multispheres and Earth System, And Key Laboratory of Marine Chemistry Theory and Technology, Ministry of Education, Ocean University of China, Qingdao, 266100, China; College of Chemistry & Chemical Engineering, Ocean University of China, Qingdao, 266100, PR China
| | - Fengshu Li
- Frontiers Science Center for Deep Ocean Multispheres and Earth System, And Key Laboratory of Marine Chemistry Theory and Technology, Ministry of Education, Ocean University of China, Qingdao, 266100, China; College of Chemistry & Chemical Engineering, Ocean University of China, Qingdao, 266100, PR China
| | - Yiming Li
- Frontiers Science Center for Deep Ocean Multispheres and Earth System, And Key Laboratory of Marine Chemistry Theory and Technology, Ministry of Education, Ocean University of China, Qingdao, 266100, China; College of Chemistry & Chemical Engineering, Ocean University of China, Qingdao, 266100, PR China
| | - Wenxiu Liu
- College of Marine Life Sciences, Ocean University of China, Qingdao, 266100, PR China
| | - Yan Yang
- College of Marine Life Sciences, Ocean University of China, Qingdao, 266100, PR China
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12
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Ecotoxicological Estimation of 4-Cumylphenol, 4- t-Octylphenol, Nonylphenol, and Volatile Leachate Phenol Degradation by the Microscopic Fungus Umbelopsis isabellina Using a Battery of Biotests. INTERNATIONAL JOURNAL OF ENVIRONMENTAL RESEARCH AND PUBLIC HEALTH 2022; 19:ijerph19074093. [PMID: 35409777 PMCID: PMC8998573 DOI: 10.3390/ijerph19074093] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 02/16/2022] [Revised: 03/22/2022] [Accepted: 03/28/2022] [Indexed: 02/04/2023]
Abstract
The phenolic xenobiotics nonylphenol (NP), 4-tert-octylphenol (4-t-OP), and 4-cumylphenol (4-CP) have the potential to seriously disrupt the endocrine system. Volatile phenols (VPs), especially those present in landfill leachate, also adversely affect the health of numerous organisms. Microbial degradation of xenobiotics can result in the formation of intermediates with higher toxicity than the precursor substrates. Therefore, the main aim of this study was to assess the changes in environmental ecotoxicity during the biotransformation of nonylphenol, 4-tert-octylphenol, 4-cumylphenol and volatile phenols by Umbelopsis isabellina using a battery of biotests. The application of bioindicators belonging to different taxonomic groups and diverse trophic levels (producers, consumers, and reducers) indicated a significant reduction in toxicity during the cultivation of fungus cultures both for nonylphenol, 4-tert-octylphenol, 4-cumylphenol and volatile phenols. The rate of toxicity decline was correlated with the degree of xenobiotic biotransformation. Removal of 4-cumylphenol and 4-tert-octylphenol also led to a decrease in the anti-androgenic potential. Moreover, this is the first report demonstrating the anti-androgenic properties of 4-cumylphenol. The results showed that U. isabellina is an attractive tool for the bioremediation and detoxification of contaminated environments.
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He C, Feng J, Su J, Zhang T, Yu L. Application of Matrix-Assisted Laser Desorption/Ionization Time-of-Flight Mass Spectrometry for the Rapid Identification of Yeast Species From Polar Regions. Front Microbiol 2022; 13:832893. [PMID: 35283859 PMCID: PMC8905632 DOI: 10.3389/fmicb.2022.832893] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/10/2021] [Accepted: 02/02/2022] [Indexed: 11/13/2022] Open
Abstract
Protein profiling based on matrix-assisted laser desorption/ionization time-of-flight (MALDI-TOF) mass spectrometry (MS) has proved to be a powerful tool for yeast identification. However, it is rarely used in the identification of yeast isolates from polar regions, which may be due to the limited data available for the differentiation of polar yeast species. The present study constructed a supplementary database of MALDI-TOF MS, including 33 yeast species from the Arctic and Antarctica. These yeast species were used to assess the accuracy and practicality of MALDI-TOF MS-based identification compared to the ribosomal DNA [internal transcribed spacer (ITS) and large subunit (LSU) gene regions] sequencing identification. Their dendrogram based on main spectra profiles (MSPs) in the supplementary database was somewhat consistent with their phylogenetic tree. The accuracy of MALDI-TOF MS identification was also compared by the ethanol-formic acid extraction method and the on-plate extraction method. In addition, peptide markers of some yeast species (e.g., Glaciozyma, Phenoliferia, Mrakia, and Vishniacozyma) were identified. It is concluded that the MALDI-TOF MS method can differentiate some closely related yeast species from polar regions, thus is suitable for the identification of polar yeasts.
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Affiliation(s)
- Chenyang He
- China Pharmaceutical Culture Collection, Institute of Medicinal Biotechnology, Chinese Academy of Medical Sciences and Peking Union Medical College, Beijing, China
| | - Jianju Feng
- China Pharmaceutical Culture Collection, Institute of Medicinal Biotechnology, Chinese Academy of Medical Sciences and Peking Union Medical College, Beijing, China
| | - Jing Su
- China Pharmaceutical Culture Collection, Institute of Medicinal Biotechnology, Chinese Academy of Medical Sciences and Peking Union Medical College, Beijing, China
| | - Tao Zhang
- China Pharmaceutical Culture Collection, Institute of Medicinal Biotechnology, Chinese Academy of Medical Sciences and Peking Union Medical College, Beijing, China
| | - Liyan Yu
- China Pharmaceutical Culture Collection, Institute of Medicinal Biotechnology, Chinese Academy of Medical Sciences and Peking Union Medical College, Beijing, China
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14
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Mondini A, Anwar MZ, Ellegaard-Jensen L, Lavin P, Jacobsen CS, Purcarea C. Heat Shock Response of the Active Microbiome From Perennial Cave Ice. Front Microbiol 2022; 12:809076. [PMID: 35360653 PMCID: PMC8960993 DOI: 10.3389/fmicb.2021.809076] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/04/2021] [Accepted: 12/28/2021] [Indexed: 11/13/2022] Open
Abstract
Ice caves constitute the newly investigated frozen and secluded model habitats for evaluating the resilience of ice-entrapped microbiomes in response to climate changes. This survey identified the total and active prokaryotic and eukaryotic communities from millennium-old ice accumulated in Scarisoara cave (Romania) using Illumina shotgun sequencing of the ribosomal RNA (rRNA) and messenger RNA (mRNA)-based functional analysis of the metatranscriptome. Also, the response of active microbiome to heat shock treatment mimicking the environmental shift during ice melting was evaluated at both the taxonomic and metabolic levels. The putatively active microbial community was dominated by bacterial taxa belonging to Proteobacteria and Bacteroidetes, which are highly resilient to thermal variations, while the scarcely present archaea belonging to Methanomicrobia was majorly affected by heat shock. Among eukaryotes, the fungal rRNA community was shared between the resilient Chytridiomycota and Blastocladiomycota, and the more sensitive Ascomycota and Basidiomycota taxa. A complex microeukaryotic community highly represented by Tardigrada and Rotifera (Metazoa), Ciliophora and Cercozoa (Protozoa), and Chlorophyta (Plantae) was evidenced for the first time in this habitat. This community showed a quick reaction to heat shock, followed by a partial recovery after prolonged incubation at 4°C due to possible predation processes on the prokaryotic cluster. Analysis of mRNA differential gene expression revealed the presence of an active microbiome in the perennial ice from the Scarisoara cave and associated molecular mechanisms for coping with temperature variations by the upregulation of genes involved in enzyme recovery, energy storage, carbon and nitrogen regulation, and cell motility. This first report on the active microbiome embedded in perennial ice from caves and its response to temperature stress provided a glimpse into the impact of glaciers melting and the resilience mechanisms in this habitat, contributing to the knowledge on the functional role of active microbes in frozen environments and their response to climatic changes.
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Affiliation(s)
- Antonio Mondini
- Department of Microbiology, Institute of Biology, Bucharest, Romania
| | - Muhammad Zohaib Anwar
- Department of Environmental Science, Aarhus University, RISØ Campus, Roskilde, Denmark
- Center for Infectious Disease Genomics and One Health, Faculty of Health Sciences, Simon Fraser University, Burnaby, BC, Canada
| | - Lea Ellegaard-Jensen
- Department of Environmental Science, Aarhus University, RISØ Campus, Roskilde, Denmark
| | - Paris Lavin
- Centre of Biotechnology and Bioengineering (CeBiB), Universidad de Antofagasta, Antofagasta, Chile
- Departamento de Biotecnología, Facultad de Ciencias del Mar y Recursos Biológicos, Universidad de Antofagasta, Antofagasta, Chile
| | - Carsten Suhr Jacobsen
- Department of Environmental Science, Aarhus University, RISØ Campus, Roskilde, Denmark
| | - Cristina Purcarea
- Department of Microbiology, Institute of Biology, Bucharest, Romania
- *Correspondence: Cristina Purcarea,
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15
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Recent developments in the biology and biotechnological applications of halotolerant yeasts. World J Microbiol Biotechnol 2022; 38:27. [PMID: 34989905 DOI: 10.1007/s11274-021-03213-0] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/05/2021] [Accepted: 12/15/2021] [Indexed: 10/19/2022]
Abstract
Natural hypersaline environments are inhabited by an abundance of prokaryotic and eukaryotic microorganisms capable of thriving under extreme saline conditions. Yeasts represent a substantial fraction of halotolerant eukaryotic microbiomes and are frequently isolated as food contaminants and from solar salterns. During the last years, a handful of new species has been discovered in moderate saline environments, including estuarine and deep-sea waters. Although Saccharomyces cerevisiae is considered the primary osmoadaptation model system for studies of hyperosmotic stress conditions, our increasing understanding of the physiology and molecular biology of halotolerant yeasts provides new insights into their distinct metabolic traits and provides novel and innovative opportunities for genome mining of biotechnologically relevant genes. Yeast species such as Debaryomyces hansenii, Zygosaccharomyces rouxii, Hortaea werneckii and Wallemia ichthyophaga show unique properties, which make them attractive for biotechnological applications. Select halotolerant yeasts are used in food processing and contribute to aromas and taste, while certain gene clusters are used in second generation biofuel production. Finally, both pharmaceutical and chemical industries benefit from applications of halotolerant yeasts as biocatalysts. This comprehensive review summarizes the most recent findings related to the biology of industrially-important halotolerant yeasts and provides a detailed and up-to-date description of modern halotolerant yeast-based biotechnological applications.
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16
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Zhang Y, Xiao X, Zhu X, Chen B. Self-assembled fungus-biochar composite pellets (FBPs) for enhanced co-sorption-biodegradation towards phenanthrene. CHEMOSPHERE 2022; 286:131887. [PMID: 34426279 DOI: 10.1016/j.chemosphere.2021.131887] [Citation(s) in RCA: 5] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/18/2021] [Revised: 07/04/2021] [Accepted: 08/11/2021] [Indexed: 06/13/2023]
Abstract
Sorption and biodegradation are two major applicable techniques for organic pollutants removal. However, the desorption risk following the sorption process and the low bioavailability of trace pollutants to microbes are still hindering the efficient removal of pollutants. To take full advantages of both sorption (for contaminant accumulation) and microbial degradation, here we introduce a self-assembly method combining carbonaceous sorbents (i.e., biochars: RS350, RS500, and RS700) with fungal hyphae (Phanerochaete chrysosporium) which can efficiently degrade phenanthrene (PHE), one of the typical polycyclic aromatic hydrocarbons. By cultivating Phanerochaete chrysosporium in biochar-containing medium, fungus-biochar composite pellets (FBPs) were successfully synthesized with a 3D macrostructure of abundant hyphae and uniform pellet size (~2.5 mm in diameter). Benefiting from the high sorption ability of biochars, such FBPs showed up to triple sorption ability and 70 folds faster biodegradation rate than pure fungal pellets. The PHE concentration remaining in solution receiving co-sorption-degradation treatment after 22 d was only one third of that receiving sorption treatment alone. Continuous removal experiment indicated that these composite pellets could hold their removal ability of above 90 % in the first 4 cycles. This study points out a simple and promising self-assembly approach that could be easily scaled up to manufacture FBPs with high removal efficiency, fast biodegradation rate, easy separation ability and long-term stability.
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Affiliation(s)
- Yuecan Zhang
- Department of Environmental Science, Zhejiang University, Hangzhou, 310058, China; Zhejiang Provincial Key Laboratory of Organic Pollution Process and Control, Hangzhou, 310058, China
| | - Xin Xiao
- Department of Materials Science and Engineering, Stanford University, Stanford, CA, 94305, United States
| | - Xiaomin Zhu
- College of Resources and Environment, Anhui Agricultural University, Hefei, 230036, China
| | - Baoliang Chen
- Department of Environmental Science, Zhejiang University, Hangzhou, 310058, China; Zhejiang Provincial Key Laboratory of Organic Pollution Process and Control, Hangzhou, 310058, China.
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17
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Cao H, Zhang X, Wang S, Liu J, Han D, Zhao B, Wang H. Insights Into Mechanism of the Naphthalene-Enhanced Biodegradation of Phenanthrene by Pseudomonas sp. SL-6 Based on Omics Analysis. Front Microbiol 2021; 12:761216. [PMID: 34867892 PMCID: PMC8635735 DOI: 10.3389/fmicb.2021.761216] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/19/2021] [Accepted: 10/18/2021] [Indexed: 12/04/2022] Open
Abstract
The existence of polycyclic aromatic hydrocarbons (PAHs) in contaminated environment is multifarious. At present, studies of metabolic regulation focus on the degradation process of single PAH. The global metabolic regulatory mechanisms of microorganisms facing coexisting PAHs are poorly understood, which is the major bottleneck for efficient bioremediation of PAHs pollution. Naphthalene (NAP) significantly enhanced the biodegradation of phenanthrene (PHE) by Pseudomonas sp. SL-6. To explore the underlying mechanism, isobaric tags for relative and absolute quantification (iTRAQ) labeled quantitative proteomics was used to characterize the differentially expressed proteins of SL-6 cultured with PHE or NAP + PHE as carbon source. Through joint analysis of proteome and genome, unique proteins were identified and quantified. The up-regulated proteins mainly concentrated in PAH catabolism, Transporters and Electron transfer carriers. In the process, the regulator NahR, activated by salicylate (intermediate of NAP-biodegradation), up-regulates degradation enzymes (NahABCDE and SalABCDEFGH), which enhances the biodegradation of PHE and accumulation of toxic intermediate–1-hydroxy-2-naphthoic acid (1H2Na); 1H2Na stimulates the expression of ABC transporter, which maintains intracellular physiological activity by excreting 1H2Na; the up-regulation of cytochrome C promotes the above process running smoothly. Salicylate works as a trigger that stimulates cell to respond globally. The conjecture was verified at transcriptional and metabolic levels. These new insights contribute to improving the overall understanding of PAHs-biodegradation processes under complex natural conditions, and promoting the application of microbial remediation technology for PAHs pollution.
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Affiliation(s)
- Hao Cao
- Graduate School, Chinese Academy of Agricultural Sciences, Beijing, China
| | - Xinyu Zhang
- Graduate School, Chinese Academy of Agricultural Sciences, Beijing, China
| | - Shuangyan Wang
- Graduate School, Chinese Academy of Agricultural Sciences, Beijing, China
| | - Jiading Liu
- Graduate School, Chinese Academy of Agricultural Sciences, Beijing, China
| | - Dongfei Han
- Institute of Environment and Sustainable Development in Agriculture, Chinese Academy of Agricultural Sciences, Beijing, China
| | - Baisuo Zhao
- Graduate School, Chinese Academy of Agricultural Sciences, Beijing, China
| | - Haisheng Wang
- Graduate School, Chinese Academy of Agricultural Sciences, Beijing, China
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