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Bhatt P, Bhatt K, Huang Y, Li J, Wu S, Chen S. Biofilm formation in xenobiotic-degrading microorganisms. Crit Rev Biotechnol 2023; 43:1129-1149. [PMID: 36170978 DOI: 10.1080/07388551.2022.2106417] [Citation(s) in RCA: 27] [Impact Index Per Article: 27.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/12/2022] [Accepted: 06/26/2022] [Indexed: 11/03/2022]
Abstract
The increased presence of xenobiotics affects living organisms and the environment at large on a global scale. Microbial degradation is effective for the removal of xenobiotics from the ecosystem. In natural habitats, biofilms are formed by single or multiple populations attached to biotic/abiotic surfaces and interfaces. The attachment of microbial cells to these surfaces is possible via the matrix of extracellular polymeric substances (EPSs). However, the molecular machinery underlying the development of biofilms differs depending on the microbial species. Biofilms act as biocatalysts and degrade xenobiotic compounds, thereby removing them from the environment. Quorum sensing (QS) helps with biofilm formation and is linked to the development of biofilms in natural contaminated sites. To date, scant information is available about the biofilm-mediated degradation of toxic chemicals from the environment. Therefore, we review novel insights into the impact of microbial biofilms in xenobiotic contamination remediation, the regulation of biofilms in contaminated sites, and the implications for large-scale xenobiotic compound treatment.
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Affiliation(s)
- Pankaj Bhatt
- State Key Laboratory for Conservation and Utilization of Subtropical Agro-Bioresources, Guangdong Province Key Laboratory of Microbial Signals and Disease Control, Integrative Microbiology Research Centre, South China Agricultural University, Guangzhou, PR China
- Department of Agricultural & Biological Engineering, Purdue University, West Lafayette, IN, USA
| | - Kalpana Bhatt
- Department of Food Science, Purdue University, West Lafayette, IN, USA
| | - Yaohua Huang
- State Key Laboratory for Conservation and Utilization of Subtropical Agro-Bioresources, Guangdong Province Key Laboratory of Microbial Signals and Disease Control, Integrative Microbiology Research Centre, South China Agricultural University, Guangzhou, PR China
| | - Jiayi Li
- State Key Laboratory for Conservation and Utilization of Subtropical Agro-Bioresources, Guangdong Province Key Laboratory of Microbial Signals and Disease Control, Integrative Microbiology Research Centre, South China Agricultural University, Guangzhou, PR China
| | - Siyi Wu
- State Key Laboratory for Conservation and Utilization of Subtropical Agro-Bioresources, Guangdong Province Key Laboratory of Microbial Signals and Disease Control, Integrative Microbiology Research Centre, South China Agricultural University, Guangzhou, PR China
| | - Shaohua Chen
- State Key Laboratory for Conservation and Utilization of Subtropical Agro-Bioresources, Guangdong Province Key Laboratory of Microbial Signals and Disease Control, Integrative Microbiology Research Centre, South China Agricultural University, Guangzhou, PR China
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Vetrivelan V, Sakthivel S, Muthu S, Al-Saadi AA. Non-covalent interaction, adsorption characteristics and solvent effect of procainamide anti-arrhythmias drug on silver and gold loaded silica surfaces: SERS spectroscopy, density functional theory and molecular docking investigations †. RSC Adv 2023; 13:9539-9554. [PMID: 36968042 PMCID: PMC10035408 DOI: 10.1039/d3ra00514c] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/24/2023] [Accepted: 03/01/2023] [Indexed: 03/25/2023] Open
Abstract
First-principle calculations were systematically carried out to explore the structural and electronic properties of the non-covalent interaction of procainamide (PA) anti-arrhythmias drug molecules on silver-loaded and gold-loaded silica nanostructures. Computed adsorption energies presented a higher affinity of PA towards the Ag–SiO2 as compared with Au–SiO2 surfaces. The non-covalent interaction analysis revealed a weak van der Waals type of forces and hydrogen bonding, associated with a noticeable repulsive steric interaction. It was conceived that silver and gold decorated silica can be used for drug administration in biological systems due to the fact that their frontier molecular orbital energy levels were considerably altered upon absorption, decreasing the pertinent energy gaps. Moreover, the electronic spectra of PA⋯Ag–SiO2 and PA⋯Au–SiO2 structures investigated in different solvents display a notable blue shift, suggesting that noble metal-loaded silica can be effective in the context of drug delivery systems. Therefore, silver- and gold-decorated silica of three possible drug adsorption scenarios was fully analyzed to realize the associated bioactivity and drug likeness. Theoretical findings suggest that Ag- and Au–SiO2 nanocomposites can be considered potential drug delivery platforms for procainamide in medication protocols. The structural and electronic properties of the non-covalent interaction of procainamide (PA) anti-arrhythmias drug molecules on silver-loaded and gold-loaded silica nanostructures were explored using first-principle calculations.![]()
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Affiliation(s)
- V. Vetrivelan
- Department of Physics, Thanthai Periyar Government Institute of TechnologyVellore 632002India
| | - S. Sakthivel
- Department of Physics, Panimalar Engineering CollegeChennai600 123TamilnaduIndia
| | - S. Muthu
- Department of Physics, Arignar Anna Govt. Arts CollegeCheyyar 604 407TamilnaduIndia
| | - Abdulaziz A. Al-Saadi
- Department of Chemistry, King Fahd University of Petroleum & MineralsDhahran 31261Saudi Arabia
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NMR evidence for hydrogen bonding stabilized anti conformation of 1-methoxy-1-methyl-3-phenylurea and the concentration detection by SERS. J Mol Liq 2022. [DOI: 10.1016/j.molliq.2022.119096] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
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Haroon M, Iali W, Al-Saadi AA. Conformational analysis and concentration detection of linuron: Spectroscopic NMR and SERS study. SPECTROCHIMICA ACTA. PART A, MOLECULAR AND BIOMOLECULAR SPECTROSCOPY 2021; 263:120223. [PMID: 34329849 DOI: 10.1016/j.saa.2021.120223] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/27/2021] [Revised: 07/09/2021] [Accepted: 07/19/2021] [Indexed: 06/13/2023]
Abstract
Linuron is a commonly used organic herbicide which is used in plant growth control. Due to its potential health concerns, the characterization and monitoring of linuron have been a subject of several studies. In this work, we employed nuclear magnetic resonance (NMR) and Raman spectroscopic techniques supported with the density functional theory (DFT) to investigate the conformational behavior and electronic aspects of linuron. The selective nuclear Overhauser effect (SelNOE) spectra confirmed that linuron exists predominantly in the anti configuration and is facilitated with a weak intramolecular hydrogen bonding between the acidic amide proton and oxygen of methoxy moiety. Quantum chemical results showed that the corresponding syn form of the molecule is 8.5 kcal/mol less stable. Further, the surface enhanced Raman scattering (SERS) technique using gold nanoparticles (AuNPs) was implemented as a potential spectroscopic protocol for the concentration monitoring of trace linuron. The Raman responses of four vibrational modes, namely CC stretching, CN stretching, N-H rocking and ring deformation, were successfully enhanced with an excellent linear concentration-intensity dependency. The aromatic CC stretching vibration at 1595 cm-1 in the Raman spectra has demonstrated the highest enhancement factor (6.5 × 104) and the lowest limit of detection (10-7 M). The interaction of linuron with the gold nanocluster was simulated by establishing a simple DFT model which predicted that the most pronounced binding with the gold atom takes place at the benzene ring.
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Affiliation(s)
- Muhammad Haroon
- Chemistry Department, King Fahd University of Petroleum and Minerals, Dhahran 31261, Saudi Arabia
| | - Wissam Iali
- Chemistry Department, King Fahd University of Petroleum and Minerals, Dhahran 31261, Saudi Arabia
| | - Abdulaziz A Al-Saadi
- Chemistry Department, King Fahd University of Petroleum and Minerals, Dhahran 31261, Saudi Arabia.
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Hydrodynamics and surface properties influence biofilm proliferation. Adv Colloid Interface Sci 2021; 288:102336. [PMID: 33421727 DOI: 10.1016/j.cis.2020.102336] [Citation(s) in RCA: 80] [Impact Index Per Article: 26.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/04/2020] [Revised: 12/02/2020] [Accepted: 12/02/2020] [Indexed: 12/20/2022]
Abstract
A biofilm is an interface-associated colloidal dispersion of bacterial cells and excreted polymers in which microorganisms find protection from their environment. Successful colonization of a surface by a bacterial community is typically a detriment to human health and property. Insight into the biofilm life-cycle provides clues on how their proliferation can be suppressed. In this review, we follow a cell through the cycle of attachment, growth, and departure from a colony. Among the abundance of factors that guide the three phases, we focus on hydrodynamics and stratum properties due to the synergistic effect such properties have on bacteria rejection and removal. Cell motion, whether facilitated by the environment via medium flow or self-actuated by use of an appendage, drastically improves the survivability of a bacterium. Once in the vicinity of a stratum, a single cell is exposed to near-surface interactions, such as van der Waals, electrostatic and specific interactions, similarly to any other colloidal particle. The success of the attachment and the potential for detachment is heavily influenced by surface properties such as material type and topography. The growth of the colony is similarly guided by mainstream flow and the convective transport throughout the biofilm. Beyond the growth phase, hydrodynamic traction forces on a biofilm can elicit strongly non-linear viscoelastic responses from the biofilm soft matter. As the colony exhausts the means of survival at a particular location, a set of trigger signals activates mechanisms of bacterial release, a life-cycle phase also facilitated by fluid flow. A review of biofilm-relevant hydrodynamics and startum properties provides insight into future research avenues.
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Rolph CA, Jefferson B, Brookes A, Hassard F, Villa R. Achieving drinking water compliance levels for metaldehyde with an acclimated sand bioreactor. WATER RESEARCH 2020; 184:116084. [PMID: 32668301 DOI: 10.1016/j.watres.2020.116084] [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: 04/11/2019] [Revised: 06/16/2020] [Accepted: 06/17/2020] [Indexed: 06/11/2023]
Abstract
Metaldehyde removal was delivered to below the 0.1 μg L-1 regulatory concentration in a laboratory scale continuous upflow fluidised sand bioreactor that had undergone acclimation through selective enrichment for metaldehyde degradation. This is the first reported case of successful continuous flow biological treatment of metaldehyde from real drinking water sources treating environmentally realistic metaldehyde concentrations. The impact of the acclimation process was impermanent, with the duration of effective treatment directly related to the elevated concentration of metaldehyde used during the enrichment process. The efficacy of the approach was demonstrated in continuous flow columns at both laboratory and pilot scale enabling degradation rates of between 0.1 and 0.2 mg L-1 h-1. Future work needs to focus on optimisation of the sand bioreactor and the acclimation process to ensure viability and feasibility of the approach at full scale.
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Affiliation(s)
| | | | - Adam Brookes
- Anglian Water, Thorpewood House, Peterborough, UK
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A Novel Method to Reveal a Ureolytic Biofilm Attachment and In Situ Growth Monitoring by Electrochemical Impedance Spectroscopy. Appl Biochem Biotechnol 2020; 193:1379-1396. [PMID: 32700202 DOI: 10.1007/s12010-020-03386-8] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/21/2019] [Accepted: 07/16/2020] [Indexed: 10/23/2022]
Abstract
The formation of biofilms capable of efficiently carrying out ureolysis is of fundamental importance in several biotechnological systems such as urinary tract infections, building materials and municipal wastewater treatment. This work proposes a straightforward method for the formation of a ureolytic biofilm attached to graphite. The proposed strategy reduced the time needed to complete ureolysis to 3 days instead of 16 days required in suspension culture. To confirm the formation of a ureolytic biofilm, scanning electron microscopy and confocal laser scanning microscopy studies were employed ex situ. However, it is imperative to analyse the biofilm by direct non-invasive techniques. Accordingly, open circuit potential (OCP) and electrochemical impedance spectroscopy (EIS) were used as in situ monitoring techniques. The reduction in OCP from - 0.01 to - 0.2 V vs. Ag/AgCl and the increase in capacitance from 200 to 260 μF cm-2 were related to biofilm attachment. To the best of our knowledge, this is the first time in which a ureolytic biofilm attachment has been analysed by EIS. The increase in the biomass from 0.04 to 2.81 μm3 μm-2 and in average thickness from 10.19 to 32.78 μm was related to biofilm maturation.
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Werner J, Nour E, Bunk B, Spröer C, Smalla K, Springael D, Öztürk B. PromA Plasmids Are Instrumental in the Dissemination of Linuron Catabolic Genes Between Different Genera. Front Microbiol 2020; 11:149. [PMID: 32132980 PMCID: PMC7039861 DOI: 10.3389/fmicb.2020.00149] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/28/2019] [Accepted: 01/22/2020] [Indexed: 01/31/2023] Open
Abstract
PromA plasmids are broad host range (BHR) plasmids, which are often cryptic and hence have an uncertain ecological role. We present three novel PromA γ plasmids which carry genes associated with degradation of the phenylurea herbicide linuron, two of which originated from unrelated Hydrogenophaga hosts isolated from different environments (pPBL-H3-2 and pBPS33-2), and one (pEN1) which was exogenously captured from an on-farm biopurification system (BPS). Hydrogenophaga sp. plasmid pBPS33-2 carries all three necessary gene clusters (hylA, dca, ccd) determining the three main steps for conversion of linuron to Krebs cycle intermediates, while pEN1 only determines the initial linuron hydrolysis step. Hydrogenophaga sp. plasmid pPBL-H3-2 exists as two variants, both containing ccd but with the hylA and dca gene modules interchanged between each other at exactly the same location. Linuron catabolic gene clusters that determine the same step were identical on all plasmids, encompassed in differently arranged constellations and characterized by the presence of multiple IS1071 elements. In all plasmids except pEN1, the insertion spot of the catabolic genes in the PromA γ plasmids was the same. Highly similar PromA plasmids carrying the linuron degrading gene cargo at the same insertion spot were previously identified in linuron degrading Variovorax sp. Interestingly, in both Hydrogenophaga populations not every PromA plasmid copy carries catabolic genes. The results indicate that PromA plasmids are important vehicles of linuron catabolic gene dissemination, rather than being cryptic and only important for the mobilization of other plasmids.
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Affiliation(s)
- Johannes Werner
- Department of Biological Oceanography, Leibniz Institute for Baltic Sea Research, Rostock, Germany
| | - Eman Nour
- Institute for Epidemiology and Pathogen Diagnostics, Julius Kühn-Institut, Federal Research Centre for Cultivated Plants (JKI), Braunschweig, Germany
- Faculty of Organic Agriculture, Heliopolis University for Sustainable Development, Cairo, Egypt
| | - Boyke Bunk
- Bioinformatics Department, Leibniz Institute DSMZ, German Collection of Microorganisms and Cell Cultures, Braunschweig, Germany
| | - Cathrin Spröer
- Central Services, Leibniz Institute DSMZ, German Collection of Microorganisms and Cell Cultures, Braunschweig, Germany
| | - Kornelia Smalla
- Institute for Epidemiology and Pathogen Diagnostics, Julius Kühn-Institut, Federal Research Centre for Cultivated Plants (JKI), Braunschweig, Germany
| | - Dirk Springael
- Division of Soil and Water Management, KU Leuven, Leuven, Belgium
| | - Başak Öztürk
- Division of Soil and Water Management, KU Leuven, Leuven, Belgium
- Junior Research Group Microbial Biotechnology, Leibniz Institute DSMZ, German Collection of Microorganisms and Cell Cultures, Braunschweig, Germany
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Lege S, Eisenhofer A, Heras JEY, Zwiener C. Identification of transformation products of denatonium - Occurrence in wastewater treatment plants and surface waters. THE SCIENCE OF THE TOTAL ENVIRONMENT 2019; 686:140-150. [PMID: 31176813 DOI: 10.1016/j.scitotenv.2019.05.423] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/08/2019] [Revised: 05/27/2019] [Accepted: 05/28/2019] [Indexed: 06/09/2023]
Abstract
Denatonium, one of the bitterest substances known to man, was recently identified as wastewater borne micropollutant in surface waters. Therefore, photodegradation experiments and electrochemical degradation were performed to identify abiotic and putative biotic transformation products (TPs). Indirect rather than direct photodegradation proved to be important for denatonium removal by solar irradiation and produced seven TPs. Amide hydrolysis, hydroxylation, N-dealkylation, and N-dearylation were revealed as the main mechanisms. Anodic oxidation of denatonium was related to the formation of overall ten products and despite considerable different yields, all TPs from indirect photodegradation were mimicked electrochemically. Among them, lidocaine was the only TP detected after conventional wastewater treatment and in surface waters. The occurrence of lidocaine was however associated with its application as local anesthetic rather than to a degradation of denatonium. The absence of additional products suggests that denatonium degradation is negligible under environmental conditions, supporting the previously described persistent nature of this compound. Advanced water treatment techniques however have the potential to degrade denatonium. About 74% of the initial denatonium load was removed from wastewater during pilot-scale ozonation. The degradation of denatonium was accompanied here with the formation of at least two polar products, which are passing unchanged through a sand filter after ozonation. Both substances have completely unknown (toxicological) properties and this study seems to be the first report about their structures in general, as none of them was found in any of the large compound libraries (e.g. PubChem).
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Affiliation(s)
- Sascha Lege
- University of Tübingen, Environmental Analytical Chemistry, Hölderlinstraße 12, 72074 Tübingen, Germany
| | - Anna Eisenhofer
- Institute of Organic Chemistry, Faculty of Chemistry and Pharmacy, University of Regensburg, 93040 Regensburg, Germany
| | - Jorge Eduardo Yanez Heras
- University of Tübingen, Environmental Analytical Chemistry, Hölderlinstraße 12, 72074 Tübingen, Germany
| | - Christian Zwiener
- University of Tübingen, Environmental Analytical Chemistry, Hölderlinstraße 12, 72074 Tübingen, Germany.
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10
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Rolph CA, Villa R, Jefferson B, Brookes A, Choya A, Iceton G, Hassard F. From full-scale biofilters to bioreactors: Engineering biological metaldehyde removal. THE SCIENCE OF THE TOTAL ENVIRONMENT 2019; 685:410-418. [PMID: 31176226 DOI: 10.1016/j.scitotenv.2019.05.304] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/04/2019] [Revised: 05/19/2019] [Accepted: 05/20/2019] [Indexed: 06/09/2023]
Abstract
Polar, low molecular weight pesticides such as metaldehyde are challenging and costly to remove from drinking water using conventional treatment methods. Although biological treatments can be effective at treating micropollutants, through biodegradation and sorption processes, only some operational biofilters have shown the ability to remove metaldehyde. As sorption plays a minor role for such polar organic micropollutants, biodegradation is therefore likely to be the main removal pathway. In this work, the biodegradation of metaldehyde was monitored, and assessed, in an operational slow sand filter. Long-term data showed that metaldehyde degradation improved when inlet concentrations increased. A comparison of inactive and active sand batch reactors showed that metaldehyde removal happened mainly through biodegradation and that the removal rates were greater after the biofilm was acclimated through exposure to high metaldehyde concentrations. This suggested that metaldehyde removal was reliant on enrichment and that the process could be engineered to decrease treatment times (from days to hours). Through-flow experiments using fluidised bed reactors, showed the same behaviour following metaldehyde acclimation. A 40% increase in metaldehyde removal was observed in acclimated compared with non-acclimated columns. This increase was sustained for >40 days, achieving an average of 80% removal and compliance (<0.1 μ L-1) for >20 days. An initial microbial analysis of the acclimated and non-acclimated biofilm from the same filter materials, showed that the microbial community in acclimated sand was significantly different. This work presents a novel conceptual template for a faster, chemical free, low cost, biological treatment of metaldehyde and other polar pollutants in drinking water. In addition, this is the first study to report kinetics of metaldehyde degradation in an active microbial biofilm at a WTW.
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Affiliation(s)
| | - Raffaella Villa
- Cranfield University, Bedfordshire MK43 0AL, UK; De Montfort University, Leicester, LE1 9BH, UK.
| | | | - Adam Brookes
- Anglian Water, Thorpewood House, Peterborough PE3 6WT, UK
| | - Andoni Choya
- Cranfield University, Bedfordshire MK43 0AL, UK; Department of Chemical Engineering, Faculty of Science and Technology, University of the Basque Country, Bilbao, Spain
| | - Gregg Iceton
- Newcastle University, Newcastle upon Tyne NE17RU, UK
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Albers P, Weytjens B, De Mot R, Marchal K, Springael D. Molecular processes underlying synergistic linuron mineralization in a triple-species bacterial consortium biofilm revealed by differential transcriptomics. Microbiologyopen 2018; 7:e00559. [PMID: 29314727 PMCID: PMC5911999 DOI: 10.1002/mbo3.559] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/08/2017] [Accepted: 10/16/2017] [Indexed: 01/28/2023] Open
Abstract
The proteobacteria Variovorax sp. WDL1, Comamonas testosteroni WDL7, and Hyphomicrobium sulfonivorans WDL6 compose a triple‐species consortium that synergistically degrades and grows on the phenylurea herbicide linuron. To acquire a better insight into the interactions between the consortium members and the underlying molecular mechanisms, we compared the transcriptomes of the key biodegrading strains WDL7 and WDL1 grown as biofilms in either isolation or consortium conditions by differential RNAseq analysis. Differentially expressed pathways and cellular systems were inferred using the network‐based algorithm PheNetic. Coculturing affected mainly metabolism in WDL1. Significantly enhanced expression of hylA encoding linuron hydrolase was observed. Moreover, differential expression of several pathways involved in carbohydrate, amino acid, nitrogen, and sulfur metabolism was observed indicating that WDL1 gains carbon and energy from linuron indirectly by consuming excretion products from WDL7 and/or WDL6. Moreover, in consortium conditions, WDL1 showed a pronounced stress response and overexpression of cell to cell interaction systems such as quorum sensing, contact‐dependent inhibition, and Type VI secretion. Since the latter two systems can mediate interference competition, it prompts the question if synergistic linuron degradation is the result of true adaptive cooperation or rather a facultative interaction between bacteria that coincidentally occupy complementary metabolic niches.
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Affiliation(s)
- Pieter Albers
- Division of Soil and Water Management, Department of Earth and Environmental Sciences, KU Leuven, Leuven, Belgium
| | - Bram Weytjens
- Department of Microbial and Molecular Systems, Centre of Microbial and Plant Genetics, KU Leuven, Leuven, Belgium.,Department of Plant Biotechnology and Bioinformatics, Ghent University, Gent, Belgium.,Department of Information Technology, IDLab, IMEC, Ghent University, Gent, Belgium.,Bioinformatics Institute Ghent, Gent, Belgium
| | - René De Mot
- Department of Microbial and Molecular Systems, Centre of Microbial and Plant Genetics, KU Leuven, Leuven, Belgium
| | - Kathleen Marchal
- Department of Microbial and Molecular Systems, Centre of Microbial and Plant Genetics, KU Leuven, Leuven, Belgium.,Department of Plant Biotechnology and Bioinformatics, Ghent University, Gent, Belgium.,Department of Information Technology, IDLab, IMEC, Ghent University, Gent, Belgium.,Bioinformatics Institute Ghent, Gent, Belgium
| | - Dirk Springael
- Division of Soil and Water Management, Department of Earth and Environmental Sciences, KU Leuven, Leuven, Belgium
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Albers P, Lood C, Özturk B, Horemans B, Lavigne R, van Noort V, De Mot R, Marchal K, Sanchez-Rodriguez A, Springael D. Catabolic task division between two near-isogenic subpopulations co-existing in a herbicide-degrading bacterial consortium: consequences for the interspecies consortium metabolic model. Environ Microbiol 2017; 20:85-96. [DOI: 10.1111/1462-2920.13994] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/04/2016] [Accepted: 11/07/2017] [Indexed: 11/29/2022]
Affiliation(s)
- Pieter Albers
- Division of Soil and Water Management, Department of Earth and Environmental Sciences; KU Leuven; Heverlee Belgium
| | - Cédric Lood
- Department of Microbial and Molecular Systems, Centre of Microbial and Plant Genetics; KU Leuven; Heverlee Belgium
- Laboratory of Gene Technology, KU Leuven, Leuven; Belgium
| | - Basak Özturk
- Division of Soil and Water Management, Department of Earth and Environmental Sciences; KU Leuven; Heverlee Belgium
| | - Benjamin Horemans
- Division of Soil and Water Management, Department of Earth and Environmental Sciences; KU Leuven; Heverlee Belgium
| | - Rob Lavigne
- Laboratory of Gene Technology, KU Leuven, Leuven; Belgium
| | - Vera van Noort
- Department of Microbial and Molecular Systems, Centre of Microbial and Plant Genetics; KU Leuven; Heverlee Belgium
- Institute of Biology Leiden, Leiden University; Leiden The Netherlands
| | - René De Mot
- Department of Microbial and Molecular Systems, Centre of Microbial and Plant Genetics; KU Leuven; Heverlee Belgium
| | - Kathleen Marchal
- Department of Microbial and Molecular Systems, Centre of Microbial and Plant Genetics; KU Leuven; Heverlee Belgium
- Department of Plant Biotechnology and Bioinformatics; Ghent University, Gent; Belgium
- Department of Information Technology; IDLab, IMEC, Ghent University; Gent Belgium
| | - Aminael Sanchez-Rodriguez
- Department of Microbial and Molecular Systems, Centre of Microbial and Plant Genetics; KU Leuven; Heverlee Belgium
- Departamento de Ciencias Naturales; Universidad Tecnica Particular de Loja; Loja Ecuador
| | - Dirk Springael
- Division of Soil and Water Management, Department of Earth and Environmental Sciences; KU Leuven; Heverlee Belgium
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Sekhar A, Horemans B, Aamand J, Sørensen SR, Vanhaecke L, Bussche JV, Hofkens J, Springael D. Surface Colonization and Activity of the 2,6-Dichlorobenzamide (BAM) Degrading Aminobacter sp. Strain MSH1 at Macro- and Micropollutant BAM Concentrations. ENVIRONMENTAL SCIENCE & TECHNOLOGY 2016; 50:10123-33. [PMID: 27537851 DOI: 10.1021/acs.est.6b01978] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/12/2023]
Abstract
Aminobacter sp. MSH1 uses the groundwater micropollutant 2,6-dichlorobenzamide (BAM) as a C and N source and is a potential catalyst for biotreatment of BAM-contaminated groundwater in filtration units of drinking water treatment plants (DWTPs). The oligotrophic environment of DWTPs including trace pollutant concentrations, and the high flow rates impose challenges for micropollutant biodegradation in DWTPs. To understand how trace BAM concentrations affect MSH1 surface colonization and BAM degrading activity, MSH1 was cultivated in flow channels fed continuously with BAM macro- and microconcentrations in a N- and C-limiting medium. At all BAM concentrations, MSH1 colonized the flow channel. BAM degradation efficiencies were concentration-dependent, ranging between 70 and 95%. Similarly, BAM concentration affected surface colonization, but at 100 μg/L BAM and lower, colonization was similar to that in systems without BAM, suggesting that assimilable organic carbon and nitrogen other than those supplied by BAM sustained colonization at BAM microconcentrations. Comparison of specific BAM degradation rates in flow channels and in cultures of suspended freshly grown cells indicated that starvation conditions in flow channels receiving BAM microconcentrations resulted into MSH1 biomasses with 10-100-times reduced BAM degrading activity and provided a kinetic model for predicting BAM degradation under continuous C and N starvation.
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Affiliation(s)
- Aswini Sekhar
- Division of Soil and Water Management, KU Leuven , Kasteelpark Arenberg 20, BE-3001 Leuven, Belgium
| | - Benjamin Horemans
- Division of Soil and Water Management, KU Leuven , Kasteelpark Arenberg 20, BE-3001 Leuven, Belgium
| | - Jens Aamand
- Department of Geochemistry, Geological Survey of Greenland and Denmark (GEUS) , DK-1350 Copenhagen, Denmark
| | - Sebastian R Sørensen
- Department of Geochemistry, Geological Survey of Greenland and Denmark (GEUS) , DK-1350 Copenhagen, Denmark
| | - Lynn Vanhaecke
- Department of Veterinary Public Health and Food Safety, Laboratory of Chemical Analysis, UGent , BE-9000 Ghent, Belgium
| | - Julie Vanden Bussche
- Department of Veterinary Public Health and Food Safety, Laboratory of Chemical Analysis, UGent , BE-9000 Ghent, Belgium
| | - Johan Hofkens
- Molecular Imaging and Photonics, KU Leuven , Celestijnenlaan 200 F, BE-3001 Leuven, Belgium
| | - Dirk Springael
- Division of Soil and Water Management, KU Leuven , Kasteelpark Arenberg 20, BE-3001 Leuven, Belgium
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Helbling DE. Bioremediation of pesticide-contaminated water resources: the challenge of low concentrations. Curr Opin Biotechnol 2015; 33:142-8. [PMID: 25765521 DOI: 10.1016/j.copbio.2015.02.012] [Citation(s) in RCA: 40] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/22/2014] [Revised: 02/16/2015] [Accepted: 02/23/2015] [Indexed: 10/23/2022]
Abstract
The use of pesticides in agricultural and urban environments has improved quality of life around the world. However, the resulting accumulation of pesticide residues in fresh water resources has negative effects on aquatic ecosystem and human health. Bioremediation has been proposed as an environmentally sound alternative for the remediation of pesticide-contaminated water resources, though full-scale implementation has thus far been limited. One major challenge that has impeded progress is the occurrence of pesticides at low concentrations. Recent research has improved our fundamental understanding of pesticide biodegradation processes occurring at low concentrations under a variety of environmental scenarios and is expected to contribute to the development of applied bioremediation strategies for pesticide-contaminated water resources.
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Affiliation(s)
- Damian E Helbling
- School of Civil and Environmental Engineering, Cornell University, Ithaca, NY 14853, USA.
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15
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Tan DT, Temme HR, Arnold WA, Novak PJ. Estrone degradation: does organic matter (quality), matter? ENVIRONMENTAL SCIENCE & TECHNOLOGY 2015; 49:498-503. [PMID: 25454582 DOI: 10.1021/es504424v] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/04/2023]
Abstract
Understanding the parameters that drive E1 degradation is necessary to improve existing wastewater treatment systems and evaluate potential treatment options. Organic matter quality could be an important parameter. Microbial communities grown from activated sludge seeds using different dissolved organic matter sources were tested for E1 degradation rates. Synthetic wastewater was aged, filter-sterilized, and used as a carbon and energy source to determine if recalcitrant organic carbon enhances E1 degradation. Higher E1 degradation was observed by biomass grown on 8 d old synthetic wastewater compared to biomass grown on fresh synthetic wastewater (P = 0.033) despite much lower concentrations of bacteria. Minimal or no E1 degradation was observed in biomass grown on 2 d old synthetic wastewater. Organic carbon analyses suggest that products of cell lysis or microbial products released under starvation stress stimulate E1 degradation. Additional water sources were also tested: lake water, river water, and effluents from a municipal wastewater treatement plant and a treatment wetland. E1 degradation was only observed in biomass grown in treatment effluent. Nitrogen, dissolved organic carbon, and trace element concentrations were not causative factors for E1 degradation. In both experiments, spectrophotometric analyses reveal degradation of E1 is associated with microbially derived organic carbon but not general recalcitrance.
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Affiliation(s)
- David T Tan
- Department of Civil, Environmental, and Geo-Engineering, University of Minnesota , 500 Pillsbury Drive SE, Minneapolis, Minnesota 55455, United States
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Liu L, Helbling DE, Kohler HPE, Smets BF. A model framework to describe growth-linked biodegradation of trace-level pollutants in the presence of coincidental carbon substrates and microbes. ENVIRONMENTAL SCIENCE & TECHNOLOGY 2014; 48:13358-13366. [PMID: 25321868 DOI: 10.1021/es503491w] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/04/2023]
Abstract
Pollutants such as pesticides and their degradation products occur ubiquitously in natural aquatic environments at trace concentrations (μg L(-1) and lower). Microbial biodegradation processes have long been known to contribute to the attenuation of pesticides in contaminated environments. However, challenges remain in developing engineered remediation strategies for pesticide-contaminated environments because the fundamental processes that regulate growth-linked biodegradation of pesticides in natural environments remain poorly understood. In this research, we developed a model framework to describe growth-linked biodegradation of pesticides at trace concentrations. We used experimental data reported in the literature or novel simulations to explore three fundamental kinetic processes in isolation. We then combine these kinetic processes into a unified model framework. The three kinetic processes described were: the growth-linked biodegradation of micropollutant at environmentally relevant concentrations; the effect of coincidental assimilable organic carbon substrates; and the effect of coincidental microbes that compete for assimilable organic carbon substrates. We used Monod kinetic models to describe substrate utilization and microbial growth rates for specific pesticide and degrader pairs. We then extended the model to include terms for utilization of assimilable organic carbon substrates by the specific degrader and coincidental microbes, growth on assimilable organic carbon substrates by the specific degrader and coincidental microbes, and endogenous metabolism. The proposed model framework enables interpretation and description of a range of experimental observations on micropollutant biodegradation. The model provides a useful tool to identify environmental conditions with respect to the occurrence of assimilable organic carbon and coincidental microbes that may result in enhanced or reduced micropollutant biodegradation.
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Affiliation(s)
- Li Liu
- Department of Environmental Engineering, Technical, University of Denmark , Bygningstorvet 115, 2800 Kgs. Lyngby, Denmark
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