1
|
Vogeleer P, Millard P, Arbulú ASO, Pflüger-Grau K, Kremling A, Létisse F. Metabolic impact of heterologous protein production in Pseudomonas putida: Insights into carbon and energy flux control. Metab Eng 2024; 81:26-37. [PMID: 37918614 DOI: 10.1016/j.ymben.2023.10.005] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/27/2023] [Revised: 10/05/2023] [Accepted: 10/22/2023] [Indexed: 11/04/2023]
Abstract
For engineered microorganisms, the production of heterologous proteins that are often useless to host cells represents a burden on resources, which have to be shared with normal cellular processes. Within a certain metabolic leeway, this competitive process has no impact on growth. However, once this leeway, or free capacity, is fully utilized, the extra load becomes a metabolic burden that inhibits cellular processes and triggers a broad cellular response, reducing cell growth and often hindering the production of heterologous proteins. In this study, we sought to characterize the metabolic rearrangements occurring in the central metabolism of Pseudomonas putida at different levels of metabolic load. To this end, we constructed a P. putida KT2440 strain that expressed two genes encoding fluorescent proteins, one in the genome under constitutive expression to monitor the free capacity, and the other on an inducible plasmid to probe heterologous protein production. We found that metabolic fluxes are considerably reshuffled, especially at the level of periplasmic pathways, as soon as the metabolic load exceeds the free capacity. Heterologous protein production leads to the decoupling of anabolism and catabolism, resulting in large excess energy production relative to the requirements of protein biosynthesis. Finally, heterologous protein production was found to exert a stronger control on carbon fluxes than on energy fluxes, indicating that the flexible nature of P. putida's central metabolic network is solicited to sustain energy production.
Collapse
Affiliation(s)
- Philippe Vogeleer
- Toulouse Biotechnology Institute, Université de Toulouse, INSA, UPS, Toulouse, France
| | - Pierre Millard
- Toulouse Biotechnology Institute, Université de Toulouse, INSA, UPS, Toulouse, France; MetaToul-MetaboHUB, National Infrastructure of Metabolomics and Fluxomics, Toulouse, France
| | - Ana-Sofia Ortega Arbulú
- Technical University Munich, TUM School of Engineering and Design, Department of Energy and Process Engineering, Systems Biotechnology, Germany
| | - Katharina Pflüger-Grau
- Technical University Munich, TUM School of Engineering and Design, Department of Energy and Process Engineering, Systems Biotechnology, Germany
| | - Andreas Kremling
- Technical University Munich, TUM School of Engineering and Design, Department of Energy and Process Engineering, Systems Biotechnology, Germany
| | - Fabien Létisse
- Toulouse Biotechnology Institute, Université de Toulouse, INSA, UPS, Toulouse, France.
| |
Collapse
|
2
|
Mafla-Endara PM, Meklesh V, Beech JP, Ohlsson P, Pucetaite M, Hammer EC. Exposure to polystyrene nanoplastics reduces bacterial and fungal biomass in microfabricated soil models. Sci Total Environ 2023; 904:166503. [PMID: 37633381 DOI: 10.1016/j.scitotenv.2023.166503] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/06/2023] [Revised: 08/04/2023] [Accepted: 08/21/2023] [Indexed: 08/28/2023]
Abstract
Nanoplastics have been proven to induce toxicity in diverse organisms, yet their effect on soil microbes like bacteria and fungi remains largely unexplored. In this paper, we used micro-engineered soil models to investigate the effect of polystyrene (PS) nanospheres on Pseudomonas putida and Coprinopsis cinerea. Specifically, we explored the effects of increasing concentrations of 60 nm carboxylated bovine serum albumin (BSA) coated nanospheres (0, 0.5, 2, and 10 mg/L) on these bacterial and fungal model organisms respectively, over time. We found that both microorganisms could disperse through the PS solution, but long-distance dispersal was reduced by high concentrations. Microbial biomass decreased in all treatments, in which bacteria showed a linear dose response with the strongest effect at 10 mg/L concentration, and fungi showed a non-linear response with the strongest effect at 2 mg/L concentration. At the highest nanoplastics concentration, the first colonizing fungal hyphae adsorbed most of the PS nanospheres present in their vicinity, in a process that we termed the 'vacuum cleaner effect'. As a result, the toxicity effect of the original treatment on subsequently growing fungal hyphae was reduced to a growth level indistinguishable from the control. We did not find evidence that nanoplastics are able to penetrate bacterial nor fungal cell walls. Overall, our findings provide evidence that nanoplastics can cause a direct negative effect on soil microbes and highlight the need for further studies that can explain how the microbial stress response might affect soil functions.
Collapse
Affiliation(s)
- Paola M Mafla-Endara
- Centre for Environmental and Climate Science (CEC), Lund University, Lund, Sweden; Department of Biology, Lund University, Lund, Sweden.
| | - Viktoriia Meklesh
- Centre for Environmental and Climate Science (CEC), Lund University, Lund, Sweden; Physical Chemistry Division, Department of Chemistry, Lund University, Lund, Sweden
| | - Jason P Beech
- Division of Solid State Physics, Department of Physics and NanoLund, Lund University, Lund, Sweden
| | - Pelle Ohlsson
- Department of Biomedical Engineering, Faculty of Engineering (LTH), Lund University, Lund, Sweden
| | | | - Edith C Hammer
- Centre for Environmental and Climate Science (CEC), Lund University, Lund, Sweden; Department of Biology, Lund University, Lund, Sweden
| |
Collapse
|
3
|
Zakaria WGE, Atia MM, Ali AZ, Abbas EEA, Salim BMA, Marey SA, Hatamleh AA, Elnahal ASM. Assessing the Effectiveness of Eco-Friendly Management Approaches for Controlling Wheat Yellow Rust and Their Impact on Antioxidant Enzymes. Plants (Basel) 2023; 12:2954. [PMID: 37631164 PMCID: PMC10458409 DOI: 10.3390/plants12162954] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/30/2023] [Revised: 08/01/2023] [Accepted: 08/03/2023] [Indexed: 08/27/2023]
Abstract
Wheat stripe rust, caused by Puccinia striiformis f. sp. tritici (Pst), is a destructive disease that causes significant yield losses in wheat production worldwide, including in Egypt. The use of biocontrol agents is among the best eco-friendly management strategies to control this disease, as they are more sustainable and environmentally friendly than traditional chemical control methods. In a comparative analysis, antioxidant enzyme activity and various management approaches were compared with two bacterial biocontrol agents, Bacillus subtilis and Pseudomonas putida. This study showed the remarkable efficacy of endophytic bacteria, B. subtilis and P. putida, in mitigating wheat stripe rust infection across three wheat varieties, namely Misr1, Gimmeiza11, and Sids12. B. subtilis exhibited superior performance compared to P. putida, resulting in infection types of 1 and 2.66, respectively, following inoculation. The highest reduction rate was observed with Tilit fungicide (500 ppm), followed by B. subtilis and Salicylic acid (1000 ppm), respectively. Variations in wheat varieties' response to Pst infection were observed, with Misr1 exhibiting the lowest infection and Sids12 showing high susceptibility. Among the tested inducers, Salicylic acid demonstrated the greatest reduction in disease infection, followed by Indole acetic acid, while Oxalic acid exhibited the lowest decrease. Additionally, the study evaluated the activities of five antioxidant enzymes, including Catalase, Ascorbate peroxidase (APX), glutathione reductase (GR), Superoxide dismutase (SOD), and peroxidase (POX), in the wheat-stripe rust interaction under different integrated management approaches. The wheat variety Misr1 treated with Tilit (500 ppm), B. subtilis, Salicylic acid, Montoro (500 ppm), and P. putida exhibited the highest increase in all enzymatic activities. These findings provide valuable insights into the effectiveness of B. subtilis and P. putida as biocontrol agents for wheat stripe rust control in Egypt, emphasizing their potential role in sustainable, integrated, and environmentally friendly management practices.
Collapse
Affiliation(s)
- Waleed Gamal Eldein Zakaria
- Department of Plant Pathology, Faculty of Agriculture, Zagazig University, Zagazig 44511, Egypt; (W.G.E.Z.); (M.M.A.); (E.E.A.A.)
- State Key Laboratory of Crop Stress Biology for Arid Areas, College of Plant Protection, Northwest A&F University, Xianyang 712100, China
| | - Mahmoud Mohamed Atia
- Department of Plant Pathology, Faculty of Agriculture, Zagazig University, Zagazig 44511, Egypt; (W.G.E.Z.); (M.M.A.); (E.E.A.A.)
| | - Ahmed Zaki Ali
- Department of Plant Pathology, Faculty of Agriculture, Zagazig University, Zagazig 44511, Egypt; (W.G.E.Z.); (M.M.A.); (E.E.A.A.)
| | - Entsar E. A. Abbas
- Department of Plant Pathology, Faculty of Agriculture, Zagazig University, Zagazig 44511, Egypt; (W.G.E.Z.); (M.M.A.); (E.E.A.A.)
| | - Bilkess M. A. Salim
- Plant Production Department, Faculty of Agriculture, Sabha University, Sabha P.O. Box 18758, Libya;
| | | | - Ashraf Atef Hatamleh
- Department of Botany and Microbiology, College of Science, King Saud University, Riyadh 11451, Saudi Arabia;
| | - Ahmed Saeed Mohammed Elnahal
- Department of Plant Pathology, Faculty of Agriculture, Zagazig University, Zagazig 44511, Egypt; (W.G.E.Z.); (M.M.A.); (E.E.A.A.)
| |
Collapse
|
4
|
Yu Q, Mishra B, Fein JB. Role of bacterial cell surface sulfhydryl sites in cadmium detoxification by Pseudomonas putida. J Hazard Mater 2020; 391:122209. [PMID: 32036314 DOI: 10.1016/j.jhazmat.2020.122209] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/17/2019] [Revised: 01/29/2020] [Accepted: 01/29/2020] [Indexed: 06/10/2023]
Abstract
Understanding bacterial metal detoxification systems is crucial for determining the environmental impacts of metal pollution and for developing advanced bioremediation and water disinfection strategies. Here, we explore the role of cell surface sulfhydryl sites in bacterial detoxification of Cd, using Pseudomonas putida with surface sulfhydryl sites mostly on its EPS molecules as a model organism. Our results show that 5 and 20 ppm Cd in LB growth medium affects the lag phase of P. putida, but not the overall extent of cell growth at stationary phase, indicating that P. putida can detoxify Cd at these concentrations. EXAFS analysis of Cd bound to biomass from the different growth stages indicates that Cd binds to both sulfhydryl and non-sulfhydryl sites, but that the importance of Cd-sulfhydryl binding increases from early exponential to stationary phase. Cell growth is positively correlated to the measured sulfhydryl concentration on different biomass samples, but is independent of the measured non-sulfhydryl binding site concentration on the cell surfaces. Taken together, our results demonstrate that the sulfhydryl binding sites on EPS molecules can play an important role in binding and detoxifying toxic metals, significantly decreasing the bioavailability of the metal by sequestering it away from the bacterial cells.
Collapse
Affiliation(s)
- Qiang Yu
- Department of Civil & Environmental Engineering & Earth Sciences, University of Notre Dame, Notre Dame, IN, 46556, United States.
| | - Bhoopesh Mishra
- School of Chemical and Process Engineering, University of Leeds, Leeds, LS29JT, United Kingdom
| | - Jeremy B Fein
- Department of Civil & Environmental Engineering & Earth Sciences, University of Notre Dame, Notre Dame, IN, 46556, United States
| |
Collapse
|
5
|
Tsipa A, Koutinas M, Usaku C, Mantalaris A. Optimal bioprocess design through a gene regulatory network - Growth kinetic hybrid model: Towards replacing Monod kinetics. Metab Eng 2018; 48:129-137. [PMID: 29729316 DOI: 10.1016/j.ymben.2018.04.023] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/20/2017] [Revised: 03/14/2018] [Accepted: 04/30/2018] [Indexed: 01/01/2023]
Abstract
Currently, design and optimisation of biotechnological bioprocesses is performed either through exhaustive experimentation and/or with the use of empirical, unstructured growth kinetics models. Whereas, elaborate systems biology approaches have been recently explored, mixed-substrate utilisation is predominantly ignored despite its significance in enhancing bioprocess performance. Herein, bioprocess optimisation for an industrially-relevant bioremediation process involving a mixture of highly toxic substrates, m-xylene and toluene, was achieved through application of a novel experimental-modelling gene regulatory network - growth kinetic (GRN-GK) hybrid framework. The GRN model described the TOL and ortho-cleavage pathways in Pseudomonas putida mt-2 and captured the transcriptional kinetics expression patterns of the promoters. The GRN model informed the formulation of the growth kinetics model replacing the empirical and unstructured Monod kinetics. The GRN-GK framework's predictive capability and potential as a systematic optimal bioprocess design tool, was demonstrated by effectively predicting bioprocess performance, which was in agreement with experimental values, when compared to four commonly used models that deviated significantly from the experimental values. Significantly, a fed-batch biodegradation process was designed and optimised through the model-based control of TOL Pr promoter expression resulting in 61% and 60% enhanced pollutant removal and biomass formation, respectively, compared to the batch process. This provides strong evidence of model-based bioprocess optimisation at the gene level, rendering the GRN-GK framework as a novel and applicable approach to optimal bioprocess design. Finally, model analysis using global sensitivity analysis (GSA) suggests an alternative, systematic approach for model-driven strain modification for synthetic biology and metabolic engineering applications.
Collapse
Affiliation(s)
- Argyro Tsipa
- Department of Chemical Engineering, South Kensington Campus, Imperial College London, London, United Kingdom
| | - Michalis Koutinas
- Department of Environmental Science and Technology, Cyprus University of Technology, 30 Archbishop Kuprianou Str., Limassol, Cyprus
| | - Chonlatep Usaku
- Department of Chemical Engineering, South Kensington Campus, Imperial College London, London, United Kingdom; Department of Biotechnology, Silpakorn University, Nakorn Pathom 73000, Thailand
| | - Athanasios Mantalaris
- Department of Chemical Engineering, South Kensington Campus, Imperial College London, London, United Kingdom.
| |
Collapse
|
6
|
Cabral L, Yu RQ, Crane S, Giovanella P, Barkay T, Camargo FAO. Methylmercury degradation by Pseudomonas putida V1. Ecotoxicol Environ Saf 2016; 130:37-42. [PMID: 27062344 DOI: 10.1016/j.ecoenv.2016.03.036] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/22/2015] [Revised: 03/25/2016] [Accepted: 03/28/2016] [Indexed: 06/05/2023]
Abstract
Environmental contamination of mercury (Hg) has caused public health concerns with focuses on the neurotoxic substance methylmercury, due to its bioaccumulation and biomagnification in food chains. The goals of the present study were to examine: (i) the transformation of methylmercury, thimerosal, phenylmercuric acetate and mercuric chloride by cultures of Pseudomonas putida V1, (ii) the presence of the genes merA and merB in P. putida V1, and (iii) the degradation pathways of methylmercury by P. putida V1. Strain V1 cultures readily degraded methylmercury, thimerosal, phenylmercury acetate, and reduced mercuric chloride into gaseous Hg(0). However, the Hg transformation in LB broth by P. putida V1 was influenced by the type of Hg compounds. The merA gene was detected in P. putida V1, on the other hand, the merB gene was not detected. The sequencing of this gene, showed high similarity (100%) to the mercuric reductase gene of other Pseudomonas spp. Furthermore, tests using radioactive (14)C-methylmercury indicated an uncommon release of (14)CO2 concomitant with the production of Hg(0). The results of the present work suggest that P. putida V1 has the potential to remove methylmercury from contaminated sites. More studies are warranted to determine the mechanism of removal of methylmercury by P. putida V1.
Collapse
Affiliation(s)
- Lucélia Cabral
- Microbial Resources Division - Research Center for Chemistry, Biology and Agriculture (CPQBA), University of Campinas (UNICAMP), Av. Alexandre Cazelatto, 999, Campinas, SP 13148-218, Brazil.
| | - Ri-Qing Yu
- The University of Texas at Tyler - Department of Biology, 3900 University Blvd., Tyler, Texas 75799, United States
| | - Sharron Crane
- Rutgers, The State University of New Jersey - Department of Biochemistry and Microbiology, 76 Lipman Drive - New Brunswick, NJ 08901-8525, United States
| | - Patricia Giovanella
- Departament of Soil Science, Federal University of Rio Grande do Sul, 7712 Avenida Bento Gonçalves, 91540-000 Porto Alegre, RS, Brazil
| | - Tamar Barkay
- Rutgers, The State University of New Jersey - Department of Biochemistry and Microbiology, 76 Lipman Drive - New Brunswick, NJ 08901-8525, United States
| | - Flávio A O Camargo
- Departament of Soil Science, Federal University of Rio Grande do Sul, 7712 Avenida Bento Gonçalves, 91540-000 Porto Alegre, RS, Brazil
| |
Collapse
|
7
|
Bedoui A, Tigini V, Ghedira K, Varese GC, Chekir Ghedira L. Evaluation of an eventual ecotoxicity induced by textile effluents using a battery of biotests. Environ Sci Pollut Res Int 2015; 22:16700-16708. [PMID: 26087930 DOI: 10.1007/s11356-015-4862-3] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/02/2014] [Accepted: 06/08/2015] [Indexed: 06/04/2023]
Abstract
Textile industry is considered as one of the important factors of the economic growth in Tunisia. However, this prominent role has certainly some drawbacks mainly represented by the huge amounts of textile wastewaters generated that become a real menace to nature. Many previous studies showed the purifying potential of some activated sludge and bacteria (Pseudomonas putida) to decolourize textile effluents. However, in many cases, decolourization of wastewaters is not necessary associated with detoxification, generating a real risk for the ecosystem in general. We evaluated in this work the induced toxicity of a textile effluent before and after its treatment with activated sludge followed by P. putida, using a battery of biotests. This study proved the detoxifying power of the activated sludge according to most of ecotoxicity tests. The treatment with P. putida did not improve the quality of the effluent; on the contrary, it could increase its toxicity. Daphnia magna and Raphidocelis subcapitata appear to be the most sensitive organisms in assessing eventual toxicity caused by this kind of wastewaters.
Collapse
Affiliation(s)
- Ahmed Bedoui
- Unité de substances Naturelles Bioactives et Biotechnologie, UR12ES12, Faculté de Pharmacie de Monastir, Université de Monastir, Rue Avicenne, 5000, Monastir, Tunisia
| | - Valeria Tigini
- Department of Life Sciences and Systems Biology, University of Turin, viale Mattioli 25, 10125, Turin, Italy
| | - Kamel Ghedira
- Unité de substances Naturelles Bioactives et Biotechnologie, UR12ES12, Faculté de Pharmacie de Monastir, Université de Monastir, Rue Avicenne, 5000, Monastir, Tunisia
| | - Giovanna Cristina Varese
- Department of Life Sciences and Systems Biology, University of Turin, viale Mattioli 25, 10125, Turin, Italy
| | - Leila Chekir Ghedira
- Unité de substances Naturelles Bioactives et Biotechnologie, UR12ES12, Faculté de Pharmacie de Monastir, Université de Monastir, Rue Avicenne, 5000, Monastir, Tunisia.
- Laboratoire de Biologie Cellulaire et Moléculaire, Faculté de Médecine Dentaire, Université de Monastir, Rue Avicenne, 5000, Monastir, Tunisia.
| |
Collapse
|
8
|
Ray S, Banerjee A. Molecular level biodegradation of phenol and its derivatives through dmp operon of Pseudomonas putida: A bio-molecular modeling and docking analysis. J Environ Sci (China) 2015; 36:144-151. [PMID: 26456616 DOI: 10.1016/j.jes.2015.03.035] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/16/2014] [Revised: 03/05/2015] [Accepted: 03/31/2015] [Indexed: 06/05/2023]
Abstract
Participation of Pseudomonas putida-derived methyl phenol (dmp) operon and DmpR protein in the biodegradation of phenol or other harmful, organic, toxic pollutants was investigated at a molecular level. Documentation documents that P. putida has DmpR protein which positively regulates dmp operon in the presence of inducers; like phenols. From the operon, phenol hydroxylase encoded by dmpN gene, participates in degrading phenols after dmp operon is expressed. For the purpose, the 3-D models of the four domains from DmpR protein and of the DNA sequences from the two Upstream Activation Sequences (UAS) present at the promoter region of the operon were demonstrated using discrete molecular modeling techniques. The best modeled structures satisfying their stereo-chemical properties were selected in each of the cases. To stabilize the individual structures, energy optimization was performed. In the presence of inducers, probable interactions among domains and then the two independent DNA structures with the fourth domain were perused by manifold molecular docking simulations. The complex structures were made to be stable by minimizing their overall energy. Responsible amino acid residues, nucleotide bases and binding patterns for the biodegradation, were examined. In the presence of the inducers, the biodegradation process is initiated by the interaction of phe50 from the first protein domain with the inducers. Only after the interaction of the last domain with the DNA sequences individually, the operon is expressed. This novel residue level study is paramount for initiating transcription in the operon; thereby leading to expression of phenol hydroxylase followed by phenol biodegradation.
Collapse
Affiliation(s)
- Sujay Ray
- Department of Biochemistry and Biophysics, University of Kalyani, Kalyani, 741245 Nadia, West Bengal, India; Department of Biotechnology, Bengal College of Engineering and Technology, Shahid Sukumar Sarani, Bidhannagar, Durgapur-713212, West Bengal, India.
| | - Arundhati Banerjee
- Department of Biotechnology, National Institute of Technology, Mahatma Gandhi Avenue, Durgapur 713209, West Bengal, India.
| |
Collapse
|
9
|
Liu Y, Liu K, Yu X, Li B, Cao B. Identification and control of a Pseudomonas spp (P. fulva and P. putida) bloodstream infection outbreak in a teaching hospital in Beijing, China. Int J Infect Dis 2014; 23:105-8. [PMID: 24747963 DOI: 10.1016/j.ijid.2014.02.013] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/28/2013] [Revised: 02/04/2014] [Accepted: 02/12/2014] [Indexed: 10/25/2022] Open
Abstract
OBJECTIVES An outbreak of bacteremia caused by Pseudomonas spp (P. fulva and P. putida) was first identified in our hospital in the summer of 2010 and reoccurred in the following year. Based on the epidemiological data collected in these 2 years, we initiated an investigation on the source of the outbreak. The aim of this study was to report the results of the investigation, as well as the intervention strategies that resulted in successful control of the outbreak. METHODS An infection control team was set up consisting of infectious disease specialists, microbiologists, infection control practitioners, and head nurses. The microbiology and medical records of case-patients with P. fulva or P. putida bloodstream infections were reviewed. Environmental samples and intravenous (IV) solutions from the wards and the pharmacy center were collected for culturing. The molecular characteristics of the bacterial isolates were studied by pulsed-field gel electrophoresis (PFGE). Strict infection control strategies were implemented. RESULTS A total of 20 case-patients from five inpatient wards were identified during three summer seasons from 2010 to 2012. Nineteen of them recovered with proper antibiotics. Unfortunately one died from complications of heart failure. A total of 19 isolates of P. fulva and four of P. putida were identified, of which 20 were from blood, two from environmental surface samples from the hospital pharmacy, and one from an in-use compounded solution from a case-patient in the cardiology ward. Molecular analysis revealed that the P. fulva isolated from the in-use compounded solution (5% glucose solution containing insulin, isosorbide dinitrate, and potassium magnesium aspartate) and the environmental samples had the same PFGE type as the clinical isolates. CONCLUSIONS The investigation identified that contaminated IV solution was the source of the P. fulva bacteremia, which prompted us to implement intensified control measures that resulted in successful control of the outbreak.
Collapse
Affiliation(s)
- Yingmei Liu
- Department of Infectious Diseases and Clinical Microbiology, Beijing Chao-Yang Hospital, Capital Medical University, No. 8 Gongren Tiyuchang South Road, Chaoyang District, Beijing 100020, People's Republic of China; Beijing Institute of Respiratory Medicine, Beijing, People's Republic of China; Beijing Key Laboratory of Respiratory and Pulmonary Circulation, Beijing, People's Republic of China
| | - Kun Liu
- Department of Infection Control, Beijing Chao-Yang Hospital, Capital Medical University, Beijing, People's Republic of China
| | - Xiaomin Yu
- Department of Infectious Diseases and Clinical Microbiology, Beijing Chao-Yang Hospital, Capital Medical University, No. 8 Gongren Tiyuchang South Road, Chaoyang District, Beijing 100020, People's Republic of China; Beijing Institute of Respiratory Medicine, Beijing, People's Republic of China; Beijing Key Laboratory of Respiratory and Pulmonary Circulation, Beijing, People's Republic of China
| | - Binbin Li
- Department of Infectious Diseases and Clinical Microbiology, Beijing Chao-Yang Hospital, Capital Medical University, No. 8 Gongren Tiyuchang South Road, Chaoyang District, Beijing 100020, People's Republic of China; Beijing Institute of Respiratory Medicine, Beijing, People's Republic of China; Beijing Key Laboratory of Respiratory and Pulmonary Circulation, Beijing, People's Republic of China
| | - Bin Cao
- Department of Infectious Diseases and Clinical Microbiology, Beijing Chao-Yang Hospital, Capital Medical University, No. 8 Gongren Tiyuchang South Road, Chaoyang District, Beijing 100020, People's Republic of China; Beijing Institute of Respiratory Medicine, Beijing, People's Republic of China; Beijing Key Laboratory of Respiratory and Pulmonary Circulation, Beijing, People's Republic of China.
| |
Collapse
|
10
|
Memon AR, Andresen J, Habib M, Jaffar M. Simulated sugar factory wastewater remediation kinetics using algal-bacterial raceway reactor promoted by polyacrylate polyalcohol. Bioresour Technol 2014; 157:37-43. [PMID: 24530948 DOI: 10.1016/j.biortech.2014.01.047] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/30/2013] [Revised: 01/11/2014] [Accepted: 01/14/2014] [Indexed: 06/03/2023]
Abstract
The remediation kinetics of simulated sugar factory wastewater (SFW) using an algal-bacterial culture (ABC) of Chlorella vulgaris in association with Pseudomonas putida in a raceway reactor was found to be enhanced by 89% with the addition of 80ppm of copolymer Polyacrylate polyalcohol (PAPA). This was achieved by efficient suspension of the ABC throughout the water body maintaining optimum pH and dissolved oxygen that led to rapid COD removal and improved algal biomass production. The suspension of the ABC using the co-polymer PAPA maintained a DO of 8-10mgl(-1) compared to 2-3mgl(-1) when not suspended. As a result, the non-suspended ABC only achieved a 50% reduction in COD after 96h compared to a 89% COD removal using 80ppm PAPA suspension. In addition, the algae biomass increased from 0.4gl(-1)d(-1) for the non-suspended ABC to 1.1gl(-1)d(-1) when suspended using 80ppm PAPA.
Collapse
Affiliation(s)
- Abdul Rehman Memon
- Department of Chemical Engineering, Mehran University of Engineering & Technology, Jamshoro, Pakistan.
| | - John Andresen
- School of Engineering & Physical Sciences, Heriot-Watt University, Edinburgh, Scotland EH14 4AS, United Kingdom
| | - Muddasar Habib
- Department of Chemical Engineering, University of Engineering & Technology, Peshawar, Pakistan
| | - Muhammad Jaffar
- Department of Environmental Science and Engineering, Beijing University of Chemical Technology, Beijing 100029, China
| |
Collapse
|
11
|
Collado S, Rosas I, González E, Gutierrez-Lavin A, Diaz M. Pseudomonas putida response in membrane bioreactors under salicylic acid-induced stress conditions. J Hazard Mater 2014; 267:9-16. [PMID: 24413046 DOI: 10.1016/j.jhazmat.2013.12.034] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/03/2013] [Revised: 12/16/2013] [Accepted: 12/17/2013] [Indexed: 06/03/2023]
Abstract
Starvation and changing feeding conditions are frequently characteristics of wastewater treatment plants. They are typical causes of unsteady-state operation of biological systems and provoke cellular stress. The response of a membrane bioreactor functioning under feed-induced stress conditions is studied here. In order to simplify and considerably amplify the response to stress and to obtain a reference model, a pure culture of Pseudomonas putida was selected instead of an activated sludge and a sole substrate (salicylic acid) was employed. The system degraded salicylic acid at 100-1100mg/L with a high level of efficiency, showed rapid acclimation without substrate or product inhibition phenomena and good stability in response to unsteady states caused by feed variations. Under starvation conditions, specific degradation rates of around 15mg/gh were achieved during the adaptation of the biomass to the new conditions and no biofilm formation was observed during the first days of experimentation using an initial substrate to microorganisms ratio lower than 0.1. When substrate was added to the reactor as pulses resulting in rapidly changing concentrations, P. putida growth was observed only for substrate to microorganism ratios higher than 0.6, with a maximum YX/S of 0.5g/g. Biofilm development under changing feeding conditions was fast, biomass detachment only being significant for biomass concentrations on the membrane surface that were higher than 16g/m(2).
Collapse
Affiliation(s)
- Sergio Collado
- Department of Chemical Engineering and Environmental Technology, University of Oviedo, E-33071 Oviedo, Spain
| | - Irene Rosas
- Department of Chemical Engineering and Environmental Technology, University of Oviedo, E-33071 Oviedo, Spain
| | - Elena González
- Department of Chemical Engineering and Environmental Technology, University of Oviedo, E-33071 Oviedo, Spain
| | - Antonio Gutierrez-Lavin
- Department of Chemical Engineering and Environmental Technology, University of Oviedo, E-33071 Oviedo, Spain
| | - Mario Diaz
- Department of Chemical Engineering and Environmental Technology, University of Oviedo, E-33071 Oviedo, Spain.
| |
Collapse
|
12
|
Ángeles MT, Refugio RV. In situ biosurfactant production and hydrocarbon removal by Pseudomonas putida CB-100 in bioaugmented and biostimulated oil-contaminated soil. Braz J Microbiol 2013; 44:595-605. [PMID: 24294259 PMCID: PMC3833165 DOI: 10.1590/s1517-83822013000200040] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/29/2011] [Accepted: 06/05/2012] [Indexed: 11/21/2022] Open
Abstract
In situ biosurfactant (rhamnolipid) production by Pseudomonas putida CB-100 was achieved during a bioaugmented and biostimulated treatment to remove hydrocarbons from aged contaminated soil from oil well drilling operations. Rhamnolipid production and contaminant removal were determined for several treatments of irradiated and non-irradiated soils: nutrient addition (nitrogen and phosphorus), P. putida addition, and addition of both (P. putida and nutrients). The results were compared against a control treatment that consisted of adding only sterilized water to the soils. In treatment with native microorganisms (non-irradiated soils) supplemented with P. putida, the removal of total petroleum hydrocarbons (TPH) was 40.6%, the rhamnolipid production was 1.54 mg/kg, and a surface tension of 64 mN/m was observed as well as a negative correlation (R = −0.54; p < 0.019) between TPH concentration (mg/kg) and surface tension (mN/m), When both bacteria and nutrients were involved, TPH levels were lowered to 33.7%, and biosurfactant production and surface tension were 2.03 mg/kg and 67.3 mN/m, respectively. In irradiated soil treated with P. putida, TPH removal was 24.5% with rhamnolipid generation of 1.79 mg/kg and 65.6 mN/m of surface tension, and a correlation between bacterial growth and biosurfactant production (R = −0.64; p < 0.009) was observed. When the nutrients and P. putida were added, TPH removal was 61.1%, 1.85 mg/kg of biosurfactants were produced, and the surface tension was 55.6 mN/m. In summary, in irradiated and non-irradiated soils, in situ rhamnolipid production by P. putida enhanced TPH decontamination of the soil.
Collapse
Affiliation(s)
- Martínez-Toledo Ángeles
- Facultad de Ciencias Químicas, Universidad Autónoma de San Luis Potosí, San Luis Potosí, SLP, Mexico. ; Departamento de Biotecnología y Bioingeniería, Centro de Investigación y de Estudios Avanzados del IPN, Col. San Pedro Zacatenco, Mexico, D.F., Mexico
| | | |
Collapse
|
13
|
Pantsyrnaya T, Delaunay S, Goergen JL, Guédon E, Paris C, Poupin P, Guseva E, Boudrant J. Biodegradation of Phenanthrene by Pseudomonas putida and a Bacterial Consortium in the Presence and in the Absence of a Surfactant. Indian J Microbiol 2012; 52:420-6. [PMID: 23997334 DOI: 10.1007/s12088-012-0265-z] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/09/2011] [Accepted: 03/08/2012] [Indexed: 10/28/2022] Open
Abstract
This study describes the biodegradation of phenanthrene in aqueous media in the presence and in the absence of a surfactant, Brij 30. Biodegradations were performed using either Pseudomonas putida DSMZ 8368 or a bacterial consortium Pyr01 isolated from one PAHs-polluted site. P. putida degraded phenanthrene to form 1-hydroxy-2-naphthoic acid (1H2Na) as the major metabolite. LC-MS analysis revealed the production of complementary intermediates in the presence of Brij 30, showing intense ions at mass-to-charge ratios (m/z) 97 and 195. Higher phenanthrene biodegradation rate was obtained in the presence of Brij 30. Conversely, in the case of Pyr01consortium, the addition of Brij 30 (0.5 g L(-1)) had a negative effect on biodegradation: no phenanthrene biodegradation products were detected in the medium, whereas a production of several intermediates (m/z 97, 195 and 293) was obtained without surfactant. New results on phenanthrene metabolism by P. putida DSMZ 8368 and Pyr01 consortium in the presence and in the absence of Brij 30 we obtained. They confirm that the knowledge of the effect of a surfactant on bacterial cultures is crucial for the optimization of surfactant-enhanced PAHs biodegradation.
Collapse
|