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Gao N, Zhang H, Hu C, Li Q, Li L, Lei P, Xu H, Shen W. Inoculation with Stutzerimonas stutzeri strains decreases N₂O emissions from vegetable soil by altering microbial community composition and diversity. Microbiol Spectr 2024; 12:e0018624. [PMID: 38511949 DOI: 10.1128/spectrum.00186-24] [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] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/24/2024] [Accepted: 02/28/2024] [Indexed: 03/22/2024] Open
Abstract
Inoculation with plant growth-promoting rhizobacteria (PGPR) strains has promoted plant growth and decreased nitrous oxide (N₂O) emissions from agricultural soils simultaneously. However, limited PGPR strains can mitigate N₂O emissions from agricultural soils, and the microbial ecological mechanisms underlying N₂O mitigation after inoculation are poorly understood. In greenhouse pot experiments, the effects of inoculation with Stutzerimonas stutzeri NRCB010 and NRCB025 on tomato growth and N₂O emissions were investigated in two vegetable agricultural soils with contrasting textures. Inoculation with NRCB010 and NRCB025 significantly promoted tomato growth in both soils. Moreover, inoculation with NRCB010 decreased the N₂O emissions from the fine- and coarse-textured soils by 38.7% and 52.2%, respectively, and inoculation with NRCB025 decreased the N₂O emissions from the coarse-textured soil by 76.6%. Inoculation with NRCB010 and NRCB025 decreased N₂O emissions mainly by altering soil microbial community composition and the abundance of nitrogen-cycle functional genes. The N₂O-mitigating effect might be partially explained by a decrease in the (amoA + amoB)/(nosZI + nosZII) and (nirS + nirK)/(nosZI + nosZII) ratios, respectively. Soil pH and organic matter were key variables that explain the variation in abundance of N-cycle functional genes and subsequent N₂O emission. Moreover, the N₂O-mitigating effect varied depending on soil textures and individual strain after inoculation. This study provides insights into developing biofertilizers with plant growth-promoting and N₂O-mitigating effects. IMPORTANCE Plant growth-promoting rhizobacteria (PGPR) have been applied to mitigate nitrous oxide (N₂O) emissions from agricultural soils, but the microbial ecological mechanisms underlying N₂O mitigation are poorly understood. That is why only limited PGPR strains can mitigate N₂O emissions from agricultural soils. Therefore, it is of substantial significance to reveal soil ecological mechanisms of PGPR strains to achieve efficient and reliable N₂O-mitigating effect after inoculation. Inoculation with Stutzerimonas stutzeri strains decreased N₂O emissions from two soils with contrasting textures probably by altering soil microbial community composition and gene abundance involved in nitrification and denitrification. Our findings provide detailed insight into soil ecological mechanisms of PGPR strains to mitigate N₂O emissions from vegetable agricultural soils.
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Affiliation(s)
- Nan Gao
- Department of Biological Engineering, School of Biotechnology and Pharmaceutical Engineering, Nanjing Tech University, Nanjing, China
| | - Huanhuan Zhang
- Department of Biological Engineering, School of Biotechnology and Pharmaceutical Engineering, Nanjing Tech University, Nanjing, China
| | - Chun Hu
- Department of Biological Engineering, School of Biotechnology and Pharmaceutical Engineering, Nanjing Tech University, Nanjing, China
| | - Qing Li
- Jiangsu Key Laboratory of Atmospheric Environment Monitoring and Pollution Control, Collaborative Innovation Center of Atmospheric Environment and Equipment Technology, and School of Environmental Science and Engineering, Nanjing University of Information Science and Technology, Nanjing, China
| | - Linmei Li
- Department of Biological Engineering, School of Biotechnology and Pharmaceutical Engineering, Nanjing Tech University, Nanjing, China
| | - Peng Lei
- School of Food Science and Light Industry, Nanjing Tech University, Nanjing, China
| | - Hong Xu
- School of Food Science and Light Industry, Nanjing Tech University, Nanjing, China
| | - Weishou Shen
- Jiangsu Key Laboratory of Atmospheric Environment Monitoring and Pollution Control, Collaborative Innovation Center of Atmospheric Environment and Equipment Technology, and School of Environmental Science and Engineering, Nanjing University of Information Science and Technology, Nanjing, China
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2
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Shao W, Qian Y, Zhai X, Xu L, Guo H, Zhang M, Qiao W. Mechanisms of nanoscale zero-valent iron mediating aerobic denitrification in Pseudomonas stutzeri by promoting electron transfer and gene expression. Bioresour Technol 2024; 394:130202. [PMID: 38092073 DOI: 10.1016/j.biortech.2023.130202] [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: 09/03/2023] [Revised: 12/09/2023] [Accepted: 12/11/2023] [Indexed: 12/17/2023]
Abstract
Aerobic denitrification and its mechanism by P. stutzeri was investigated in the presence of nanoscale zero-valent iron (nZVI). The removal of nitrate and ammonia was accelerated and the nitrite nitrogen accumulation was reduced by nZVI. The particle size and dosage of nZVI were key factors for enhancing aerobic denitrification. nZVI reduced the negative effects of low carbon/nitrogen, heavy metals, surfactants and salts to aerobic denitrification. nZVI and its dissolved irons were adsorbed into the bacteria cells, enhancing the transfer of electrons from nicotinamide adenine dinucleotide (NADH) to nitrate reductase. Moreover, the activities of NADH-ubiquinone reductase involved in the respiratory system, and the denitrifying enzymes were increased. The expression of denitrifying enzyme genes napA and nirS, as well as the iron metabolism gene fur, were promoted in the presence of nZVI. This work provides a strategy for enhancing the biological denitrification of wastewater using the bio-stimulation of nanomaterials.
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Affiliation(s)
- Weizhen Shao
- Department of Environmental Engineering, College of Biology and the Environment, Nanjing Forestry University, Nanjing 210037, China
| | - Yi Qian
- Department of Environmental Engineering, College of Biology and the Environment, Nanjing Forestry University, Nanjing 210037, China
| | - Xiaopeng Zhai
- Department of Environmental Engineering, College of Biology and the Environment, Nanjing Forestry University, Nanjing 210037, China
| | - Lijie Xu
- Department of Environmental Engineering, College of Biology and the Environment, Nanjing Forestry University, Nanjing 210037, China
| | - He Guo
- Department of Environmental Engineering, College of Biology and the Environment, Nanjing Forestry University, Nanjing 210037, China
| | - Ming Zhang
- Department of Environmental Engineering, College of Biology and the Environment, Nanjing Forestry University, Nanjing 210037, China
| | - Weichuan Qiao
- Department of Environmental Engineering, College of Biology and the Environment, Nanjing Forestry University, Nanjing 210037, China.
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Fan Z, Huang Y, Duan Y, Tang Z, Yang X. Effects of silver nanoparticles and various forms of silver on nitrogen removal by the denitrifier Pseudomonas stutzeri and their toxicity mechanisms. Ecotoxicol Environ Saf 2024; 269:115785. [PMID: 38056119 DOI: 10.1016/j.ecoenv.2023.115785] [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: 08/19/2023] [Revised: 11/26/2023] [Accepted: 12/01/2023] [Indexed: 12/08/2023]
Abstract
Silver nanoparticles (AgNPs) are widely used in daily life and industry because of their excellent antibacterial properties. AgNPs can exist in wastewater in various forms, such as Ag+, Ag2SO4, Ag2CO3, Ag2S, Ag2O, and AgCl. To assess the potential environmental risk of AgNPs and various forms of Ag, their toxic effects were investigated using the common denitrifier species Pseudomonas stutzeri (P. stutzeri). The inhibitory effect of AgNPs and various forms of Ag on P. stutzeri growth and its denitrification performance occurred in a concentration-dependent manner. The denitrification efficiency of P. stutzeri decreased from 95%∼97% to 89∼95%, 74∼95%, and 56∼85% under low, medium, and high exposure doses, respectively, of AgNPs and various forms of Ag. The changes in cell membrane morphology and increases in lactate dehydrogenase (LDH) release indicated that AgNPs and various forms of Ag damaged the cell membrane of P. stutzeri. Oxidative stress caused by excessive accumulation of reactive oxygen species (ROS) increased superoxide dismutase (SOD) and catalase (CAT) activities and decreased glutathione (GSH) levels. Overall, this study will help elucidate the impact of AgNPs and their transformation products on nitrogen removal efficiency in wastewater biological treatment systems.
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Affiliation(s)
- Zengzeng Fan
- College of Resources and Environmental Sciences, Nanjing Agricultural University, Nanjing 210095, China
| | - Yahui Huang
- College of Resources and Environmental Sciences, Nanjing Agricultural University, Nanjing 210095, China
| | - Ying Duan
- College of Resources and Environmental Sciences, Nanjing Agricultural University, Nanjing 210095, China
| | - Zhu Tang
- College of Resources and Environmental Sciences, Nanjing Agricultural University, Nanjing 210095, China
| | - Xinping Yang
- College of Resources and Environmental Sciences, Nanjing Agricultural University, Nanjing 210095, China.
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Jiang J, Tian W, Lu Z, Chu M, Cao H, Zhang D. Cometabolic degradation of pyrene with phenanthrene as substrate: assisted by halophilic Pseudomonas stutzeri DJP1. Biodegradation 2023; 34:519-532. [PMID: 37354271 DOI: 10.1007/s10532-023-10035-4] [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] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/09/2022] [Accepted: 05/30/2023] [Indexed: 06/26/2023]
Abstract
At present, cometabolic degradation is an extensive method for the biological removal of high molecular weight polycyclic aromatic hydrocarbons (HMW-PAHs) in the marine environment. However, due to the refractory to degradation and high toxicity, there are few studies on pyrene (PYR) cometabolic degradation with phenanthrene (PHE) as substrate. In this study, a Pseudomonas stutzeri DJP1 strain isolated from sediments was used in the cometabolic system of PHE and PYR. The biomass and the activity of key enzymes such as dehydrogenase and catechol 12 dioxygenase of strain were improved, but the enhancement of biotoxicity resulted in the inhibition of cometabolism simultaneously. Seven metabolites were identified respectively in PYR, PHE degradation cultures. It was speculated that the cometabolism of PHE and PYR had a common phthalic acid pathway, and the degradation pathway of PHE was included in the downstream pathway of PYR. The functional genes such as PhdF, NidD and CatA involved in DJP1 degradation were revealed by Genome analysis. This study provides a reference for the biodegradation of PYR and PHE in real marine environment.
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Affiliation(s)
- Junfeng Jiang
- College of Environmental Science and Engineering, Ocean University of China, Qingdao, 266100, People's Republic of China
| | - Weijun Tian
- College of Environmental Science and Engineering, Ocean University of China, Qingdao, 266100, People's Republic of China.
- Key Laboratory of Marine Environment and Ecology, Ministry of Education, Qingdao, 266100, People's Republic of China.
| | - Zhiyang Lu
- College of Environmental Science and Engineering, Ocean University of China, Qingdao, 266100, People's Republic of China
| | - Meile Chu
- College of Environmental Science and Engineering, Ocean University of China, Qingdao, 266100, People's Republic of China
| | - Huimin Cao
- College of Environmental Science and Engineering, Ocean University of China, Qingdao, 266100, People's Republic of China
| | - Dantong Zhang
- College of Environmental Science and Engineering, Ocean University of China, Qingdao, 266100, People's Republic of China
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Ivanovski I, Zylstra GJ. Genetic and Functional Characterization of a Salicylate 1-monooxygenase Located on an Integrative and Conjugative Element (ICE) in Pseudomonas stutzeri AJR13. J Microbiol 2023; 61:1025-1032. [PMID: 38100000 DOI: 10.1007/s12275-023-00093-x] [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] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/29/2023] [Revised: 11/02/2023] [Accepted: 11/05/2023] [Indexed: 01/11/2024]
Abstract
Pseudomonas stutzeri strain AJR13 was isolated for growth on the related compounds biphenyl (BPH) and diphenylmethane (DPM). The BPH and DPM degradative pathway genes are present on an integrative and conjugative element (ICE) in the chromosome. Examination of the genome sequence of AJR13 revealed a gene encoding a salicylate 1-monooxygenase (salA) associated with the ICE even though AJR13 did not grow on salicylate. Transfer of the ICE to the well-studied Pseudomonas putida KT2440 resulted in a KT2440 strain that could grow on salicylate. Knockout mutagenesis of the salA gene on the ICE in KT2440 eliminated the ability to grow on salicylate. Complementation of the knockout with the cloned salA gene restored growth on salicylate. Transfer of the cloned salA gene under control of the lac promoter to KT2440 resulted in a strain that could grow on salicylate. Heterologous expression of the salA gene in E. coli BL21 DE3 resulted in the production of catechol from salicylate, confirming that it is indeed a salicylate 1-monooxygenase. Interestingly, transfer of the cloned salA gene under control of the lac promoter to AJR13 resulted in a strain that could now grow on salicylate, suggesting that gene expression for the downstream catechol pathway is intact.
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Affiliation(s)
- Igor Ivanovski
- Department of Biology, St. Joseph's University, Patchogue, NY, 11772, USA.
- Department of Biochemistry and Microbiology, School of Environmental and Biological Sciences, Rutgers University, New Brunswick, NJ, 08901, USA.
| | - Gerben J Zylstra
- Department of Biochemistry and Microbiology, School of Environmental and Biological Sciences, Rutgers University, New Brunswick, NJ, 08901, USA
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Wei F, Xu R, Rao Q, Zhang S, Ma Z, Ma Y. Biodegradation of asphaltenes by an indigenous bioemulsifier-producing Pseudomonas stutzeri YWX-1 from shale oil in the Ordos Basin: Biochemical characterization and complete genome analysis. Ecotoxicol Environ Saf 2023; 251:114551. [PMID: 36669280 DOI: 10.1016/j.ecoenv.2023.114551] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [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: 11/07/2022] [Revised: 01/09/2023] [Accepted: 01/12/2023] [Indexed: 06/17/2023]
Abstract
Crude oil pollution is environmentally ubiquitous and has become a global public concern about its impact on human health. Asphaltenes are the key components of heavy crude oil (HCO) that are underutilized due to their high viscosity and density, and yet, the associated information about biodegradation is extremely limited in the literature. In the present study, an indigenous bacterium with effective asphaltene-degrading activity was isolated from oil shale and identified as Pseudomonas stutzeri by a polyphasic taxonomic approach, named YWX-1. Supplemented with 75 g L-1 heavy crude oil as the sole carbon source for growth in basic mineral salts liquid medium (MSM), strain YWX-1 was able to remove 49% of asphaletene fractions within 14 days, when it was cultivated with an initial inoculation size of 1%. During the degradation process, the bioemulsifier produced by strain YWX-1 could emulsify HCO obviously into particles, as well as it had the ability to solubilize asphaletenes. The bioemulsifier was identified to be a mixture of polysaccharide and protein through Fourier transform infrared spectroscopy (FT-IR). The genome of strain YWX-1 contains one circular chromosome of 4488441 bp with 63.98% GC content and 4145 protein coding genes without any plasmid. Further genome annotation indicated that strain YWX-1 possesses a serial of genes involved in bio-emulsification and asphaltenes biodegradation. This work suggested that P. stutzeri YWX-1 could be a promising species for bioremediation of HCO and its genome analysis provided insight into the molecular basis of asphaltene biodegradation and bioemulsifier production.
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Affiliation(s)
- Fengdan Wei
- College of Life Science, Northwest University, Xi´an, China
| | - Rui Xu
- College of Life Science, Northwest University, Xi´an, China
| | - Qingyan Rao
- College of Life Science, Northwest University, Xi´an, China
| | - Shuqi Zhang
- College of Life Science, Northwest University, Xi´an, China
| | - Zhiwei Ma
- College of Life Science, Northwest University, Xi´an, China
| | - Yanling Ma
- Shaanxi Provincial Key Laboratory of Biotechnology, Key Laboratory of Resources Biology and Biotechnology in Western China, Ministry of Education, College of Life Science, Northwest University, Xi´an, Shaanxi 710069, China; College of Life Science, Northwest University, 229 Tai bai North Rd, Xi´an, Shaanxi 710069, China.
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7
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Fang J, Yan L, Tan M, Li G, Liang Y, Li K. Nitrogen Removal Characteristics of a Marine Denitrifying Pseudomonas stutzeri BBW831 and a Simplified Strategy for Improving the Denitrification Performance Under Stressful Conditions. Mar Biotechnol (NY) 2023; 25:109-122. [PMID: 36446961 DOI: 10.1007/s10126-022-10185-1] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [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: 08/20/2022] [Accepted: 11/18/2022] [Indexed: 06/16/2023]
Abstract
A marine aerobic denitrifying bacterium was isolated and identified as Pseudomonas stutzeri BBW831 from the seabed silt of Beibu Gulf in China. According to the genome analysis, P. stutzeri BBW831 possessed a total of 14 genes (narG, narH, narI, narJ, napA, napB, nirB, nirD, nirS, norB, norC, norD, norQ, and nosZ) responsible for fully functional enzymes (nitrate reductase, nitrite reductase, nitric oxide reductase, and nitrous oxide reductase) involved in the complete aerobic denitrification pathway, suggesting that it had the potential for reducing nitrate to the final N2. Denitrification results showed that P. stutzeri BBW831 exhibited efficient nitrogen removal characteristics. Within 12 h, the NO3--N removal efficiency and rate reached 94.64% and 13.09 mg·L-1·h-1 under 166.10 ± 3.75 mg/L NO3--N as the sole nitrogen source, and removal efficiency of the mixed nitrogen (50.50 ± 0.55, 62.28 ± 0.74, and 64.26 ± 0.90 mg/L of initial NH4+-N, NO3--N, and NO2--N, respectively) was nearly 100%. Furthermore, a simplified strategy, by augmenting the inoculation biomass, was developed for promoting the nitrogen removal performance under high levels of NO2--N and salinity. As a result, the removal efficiency of the initial NO2--N up to approximately 130 mg/L reached 99.46% within 8 h, and the NO3--N removal efficiency achieved at 59.46% under the NaCl concentration even up to 50 g/L. The C/N ratio of 10 with organic acid salt such as trisodium citrate and sodium acetate as the carbon source was most conducive for cell growth and nitrogen removal by P. stutzeri BBW831, respectively. In conclusion, the marine P. stutzeri BBW831 contained the functional genes responsible for a complete aerobic denitrification pathway (NO3--N → NO2--N → NO → N2O → N2), and had great potential for the practical treatment of high-salinity nitrogenous mariculture wastewater.
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Affiliation(s)
- Jianhao Fang
- College of Food Science and Technology Guangdong Provincial Key Laboratory of Aquatic Product Processing and Safety Guangdong Province Engineering Laboratory for Marine Biological Products, Key Laboratory of Advanced Processing of Aquatic Product of Guangdong Higher Education Institution, Guangdong Ocean University, Guangdong Provincial Engineering Technology Research Center of Seafood, Zhanjiang, 524088, China
- Collaborative Innovation Center of Seafood Deep Processing, Dalian Polytechnic University, Dalian, 116034, China
| | - Luqi Yan
- College of Food Science and Technology Guangdong Provincial Key Laboratory of Aquatic Product Processing and Safety Guangdong Province Engineering Laboratory for Marine Biological Products, Key Laboratory of Advanced Processing of Aquatic Product of Guangdong Higher Education Institution, Guangdong Ocean University, Guangdong Provincial Engineering Technology Research Center of Seafood, Zhanjiang, 524088, China
- Collaborative Innovation Center of Seafood Deep Processing, Dalian Polytechnic University, Dalian, 116034, China
| | - Minghui Tan
- College of Food Science and Technology Guangdong Provincial Key Laboratory of Aquatic Product Processing and Safety Guangdong Province Engineering Laboratory for Marine Biological Products, Key Laboratory of Advanced Processing of Aquatic Product of Guangdong Higher Education Institution, Guangdong Ocean University, Guangdong Provincial Engineering Technology Research Center of Seafood, Zhanjiang, 524088, China.
- Collaborative Innovation Center of Seafood Deep Processing, Dalian Polytechnic University, Dalian, 116034, China.
| | - Ganghui Li
- College of Food Science and Technology Guangdong Provincial Key Laboratory of Aquatic Product Processing and Safety Guangdong Province Engineering Laboratory for Marine Biological Products, Key Laboratory of Advanced Processing of Aquatic Product of Guangdong Higher Education Institution, Guangdong Ocean University, Guangdong Provincial Engineering Technology Research Center of Seafood, Zhanjiang, 524088, China
- Collaborative Innovation Center of Seafood Deep Processing, Dalian Polytechnic University, Dalian, 116034, China
| | - Yingyin Liang
- College of Food Science and Technology Guangdong Provincial Key Laboratory of Aquatic Product Processing and Safety Guangdong Province Engineering Laboratory for Marine Biological Products, Key Laboratory of Advanced Processing of Aquatic Product of Guangdong Higher Education Institution, Guangdong Ocean University, Guangdong Provincial Engineering Technology Research Center of Seafood, Zhanjiang, 524088, China
- Collaborative Innovation Center of Seafood Deep Processing, Dalian Polytechnic University, Dalian, 116034, China
| | - Kuntai Li
- College of Food Science and Technology Guangdong Provincial Key Laboratory of Aquatic Product Processing and Safety Guangdong Province Engineering Laboratory for Marine Biological Products, Key Laboratory of Advanced Processing of Aquatic Product of Guangdong Higher Education Institution, Guangdong Ocean University, Guangdong Provincial Engineering Technology Research Center of Seafood, Zhanjiang, 524088, China.
- Collaborative Innovation Center of Seafood Deep Processing, Dalian Polytechnic University, Dalian, 116034, China.
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Jeong YJ, Kim CU, Lee KS, Kim JH, Park SY, Jeong AY, Lee JB, Kim DJ, Park YJ, Lee MS. Pseudomonas stutzeri PM101005 inhaled with atmospheric particulate matter induces lung damage through inflammatory responses. Environ Pollut 2023; 317:120741. [PMID: 36435285 DOI: 10.1016/j.envpol.2022.120741] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [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: 09/13/2022] [Revised: 11/14/2022] [Accepted: 11/22/2022] [Indexed: 06/16/2023]
Abstract
Atmospheric particulate matter (PM) contains a mixture of chemical and biological elements that pose threat to human health by increasing susceptibility to respiratory diseases. Although the identification of the microorganisms composing the PM has been assessed, their immunological impacts are still questionable. Here, we examined the mechanisms responsible for the pathogenicity of Pseudomonas stutzeri PM101005 (PMPS), a bacterium isolated from fine dust, in lung epithelial cells, alveolar cells, and macrophages. Relative to its comparative strain Pseudomonas stutzeri (PS), infections with PMPS induced higher production of inflammatory cytokines and chemokines, mediated by the activation of NF-κB and MAPK signaling pathways. Additionally, with three-dimensional (3D) airway spheroids which mimic the human bronchial epithelium, we confirmed that PMPS infections lead to relatively higher induction of pro-inflammatory cytokines than PM infections. Consistent results were observed in murine models as the infections with PMPS provoked greater inflammatory responses than the infections with PS. These PMPS-induced responses were mediated by the signaling pathways of the Toll-like receptors (TLRs), which regulated PMPS infection and played an important role in the expression of the antibiotic peptide β-defensin 3 (BD3) that suppressed PMPS proliferation. Moreover, PM pretreatment enhanced inflammatory responses and tissue damage of PMPS, while reducing BD3 expression. Overall, these results indicate that PM-isolated PMPS induce TLR-mediated inflammatory responses in lung tissues, and contributes to the understanding of the etiology of PM-induced respiratory damage.
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Affiliation(s)
- Yu-Jin Jeong
- Environmental Diseases Research Center, Korea Research Institute of Bioscience & Biotechnology (KRIBB), 125 Gwahak-ro, Daejeon, 34141, Republic of Korea
| | - Chang-Ung Kim
- Infectious Disease Research Center, Korea Research Institute of Bioscience & Biotechnology (KRIBB), 125 Gwahak-ro, Daejeon, 34141, Republic of Korea
| | - Kyung-Soo Lee
- Environmental Diseases Research Center, Korea Research Institute of Bioscience & Biotechnology (KRIBB), 125 Gwahak-ro, Daejeon, 34141, Republic of Korea; Department of Biomolecular Science, KRIBB School of Bioscience, Korea University of Science and Technology (UST), 127 Gajeong-ro, Yuseong-gu, Daejeon, 34113, Republic of Korea
| | - Ji Hyung Kim
- Department of Food Science and Biotechnology, Gachon University, Seongnam, 13120, Republic of Korea
| | - Seo Young Park
- Environmental Diseases Research Center, Korea Research Institute of Bioscience & Biotechnology (KRIBB), 125 Gwahak-ro, Daejeon, 34141, Republic of Korea
| | - Ahn Young Jeong
- Department of Biomolecular Science, KRIBB School of Bioscience, Korea University of Science and Technology (UST), 127 Gajeong-ro, Yuseong-gu, Daejeon, 34113, Republic of Korea; Infectious Disease Research Center, Korea Research Institute of Bioscience & Biotechnology (KRIBB), 125 Gwahak-ro, Daejeon, 34141, Republic of Korea
| | - Jun Bong Lee
- College of Veterinary Medicine & Institute of Veterinary Science, Kangwon National University, Chuncheon, Kangwon, 24341, Republic of Korea
| | - Doo-Jin Kim
- Department of Biomolecular Science, KRIBB School of Bioscience, Korea University of Science and Technology (UST), 127 Gajeong-ro, Yuseong-gu, Daejeon, 34113, Republic of Korea; Infectious Disease Research Center, Korea Research Institute of Bioscience & Biotechnology (KRIBB), 125 Gwahak-ro, Daejeon, 34141, Republic of Korea
| | - Young-Jun Park
- Environmental Diseases Research Center, Korea Research Institute of Bioscience & Biotechnology (KRIBB), 125 Gwahak-ro, Daejeon, 34141, Republic of Korea; Department of Biomolecular Science, KRIBB School of Bioscience, Korea University of Science and Technology (UST), 127 Gajeong-ro, Yuseong-gu, Daejeon, 34113, Republic of Korea
| | - Moo-Seung Lee
- Environmental Diseases Research Center, Korea Research Institute of Bioscience & Biotechnology (KRIBB), 125 Gwahak-ro, Daejeon, 34141, Republic of Korea; Department of Biomolecular Science, KRIBB School of Bioscience, Korea University of Science and Technology (UST), 127 Gajeong-ro, Yuseong-gu, Daejeon, 34113, Republic of Korea.
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9
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Chen D, Li Y, Jiang Q, Chen C, Xiao Z. Biogenic ferrihydrite-humin coprecipitate as an electron donor for the enhancement of microbial denitrification by Pseudomonas stutzeri. Environ Res 2023; 216:114837. [PMID: 36400223 DOI: 10.1016/j.envres.2022.114837] [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: 09/13/2022] [Revised: 10/30/2022] [Accepted: 11/14/2022] [Indexed: 06/16/2023]
Abstract
Nitrate pollution of groundwater has become an increasingly serious environmental problem that poses a great threat to aquatic ecosystems and to human health. Previous studies have shown that solid-phase humin (HM) can act as an additional electron donor to support microbial denitrification in the bioremediation of nitrate-contaminated groundwater where electron donor is deficient. However, the electron-donating capacities of HMs vary widely. In this study, we introduced ferrihydrite and prepared ferrihydrite-humin (Fh-HM) coprecipitates via biotic means to strengthen their electron-donating capacities. The spectroscopic results showed that the crystal phase of Fh did not change after coprecipitation with HM in the presence of Shewanella oneidensis MR-1, and iron may have complexed with the organic groups of HM. The Fh-HM coprecipitate prepared with an optimal initial Fh-HM mass ratio of 14:1 enhanced the microbial denitrification of Pseudomonas stutzeri with an electron-donating capacity 2.4-fold higher than that of HM alone, and the enhancement was not caused by greater bacterial growth. The alginate bead embedding assay indicated that the oxidation pathway of Fh-HM coprecipitate was mainly through direct contact between P. stutzeri and the coprecipitate. Further analyses suggested that quinone and organic-complexed Fe were the main electron-donating fractions of the coprecipitate. The results of the column experiments demonstrated that the column filled with Fh-HM-coated quartz sand exhibited a higher denitrification rate than the one filled with quartz sand, indicating its potential for practical applications.
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Affiliation(s)
- Dan Chen
- College of Urban Construction, Nanjing Tech University, Nanjing, 211816, PR China
| | - Yi Li
- College of Urban Construction, Nanjing Tech University, Nanjing, 211816, PR China
| | - Qitao Jiang
- College of Urban Construction, Nanjing Tech University, Nanjing, 211816, PR China
| | - Chuang Chen
- College of Urban Construction, Nanjing Tech University, Nanjing, 211816, PR China
| | - Zhixing Xiao
- College of Urban Construction, Nanjing Tech University, Nanjing, 211816, PR China.
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Li T, Li W, Chai X, Dai X, Wu B. PHA stimulated denitrification through regulation of preferential cofactor provision and intracellular carbon metabolism at different dissolved oxygen levels by Pseudomonas stutzeri. Chemosphere 2022; 309:136641. [PMID: 36183891 DOI: 10.1016/j.chemosphere.2022.136641] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [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: 04/21/2022] [Revised: 09/08/2022] [Accepted: 09/26/2022] [Indexed: 06/16/2023]
Abstract
Denitrification, a typical biological process mediated by complex environmental factors, i.e., carbon sources and dissolved oxygen (DO), has attracted great attention due to its contribution to the control of eutrophication and the biochemical cycling of nitrogen. However, the effects of carbon source on electron distribution and enzyme expression for enhanced denitrification under competition of electron acceptors (DO and nitrate) remain unclear. Here, we profile the carbon metabolic pathway of polyhydroxybutyrate (PHB) and glucose (Glu) at high and low DO levels (50% and 10% saturated DO, respectively). It was found that PHB enhanced the growth of Pseudomonas stutzeri (model denitrifying bacterium) and improved the specific nitrogen removal rate (SNRR) at all DO levels. The functional proteins had a better affinity for the cofactor nicotinamide-adenine dinucleotide (NADH) than for nicotinamide adenine dinucleotide phosphate (NADPH); thus, more electrons were involved in nitrogen reduction and intracellular PHB production in the PHB groups than in the Glu groups. Furthermore, the expression difference of enzymes in glucose and PHB metabolism was demonstrated by metaproteomic and target protein analysis, implying that PHB-driven intracellular carbon accumulation could optimize the intracellular electron allocation and correspondingly promote nitrogen metabolism. Our work integrated the mechanisms of intracellular carbon metabolism with preferences for electron transfer pathways in denitrification, providing a new perspective on how the selective parameters regulated microbial functions involved in denitrification.
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Affiliation(s)
- Tingting Li
- State Key Laboratory of Pollution Control and Resource Reuse, College of Environmental Science and Engineering, Tongji University, 1239 Siping Road, Shanghai 200092, China
| | - Wenxuan Li
- NUS Environmental Research Institute, National University of Singapore, 5A Engineering Drive 1, #02-01 T-Lab Building, 117411, Singapore
| | - Xiaoli Chai
- State Key Laboratory of Pollution Control and Resource Reuse, College of Environmental Science and Engineering, Tongji University, 1239 Siping Road, Shanghai 200092, China; Shanghai Institute of Pollution Control and Ecological Security, Shanghai 200092, China
| | - Xiaohu Dai
- State Key Laboratory of Pollution Control and Resource Reuse, College of Environmental Science and Engineering, Tongji University, 1239 Siping Road, Shanghai 200092, China; Shanghai Institute of Pollution Control and Ecological Security, Shanghai 200092, China
| | - Boran Wu
- State Key Laboratory of Pollution Control and Resource Reuse, College of Environmental Science and Engineering, Tongji University, 1239 Siping Road, Shanghai 200092, China.
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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. Environ Pollut 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] [What about the content of this article? (0)] [Affiliation(s)] [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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Shao Y, Yin C, Lv F, Jiang S, Wu S, Han Y, Xue W, Ma Y, Zheng J, Zhan Y, Ke X, Lu W, Lin M, Shang L, Yan Y. The Sigma Factor AlgU Regulates Exopolysaccharide Production and Nitrogen-Fixing Biofilm Formation by Directly Activating the Transcription of pslA in Pseudomonas stutzeri A1501. Genes (Basel) 2022; 13:genes13050867. [PMID: 35627252 PMCID: PMC9141998 DOI: 10.3390/genes13050867] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/11/2022] [Revised: 05/06/2022] [Accepted: 05/10/2022] [Indexed: 11/29/2022] Open
Abstract
Pseudomonas stutzeri A1501, a plant-associated diazotrophic bacterium, prefers to conform to a nitrogen-fixing biofilm state under nitrogen-deficient conditions. The extracytoplasmic function (ECF) sigma factor AlgU is reported to play key roles in exopolysaccharide (EPS) production and biofilm formation in the Pseudomonas genus; however, the function of AlgU in P. stutzeri A1501 is still unclear. In this work, we mainly investigated the role of algU in EPS production, biofilm formation and nitrogenase activity in A1501. The algU mutant ΔalgU showed a dramatic decrease both in the EPS production and the biofilm formation capabilities. In addition, the biofilm-based nitrogenase activity was reduced by 81.4% in the ΔalgU mutant. The transcriptional level of pslA, a key Psl-like (a major EPS in A1501) synthesis-related gene, was almost completely inhibited in the algU mutant and was upregulated by 2.8-fold in the algU-overexpressing strain. A predicted AlgU-binding site was identified in the promoter region of pslA. The DNase I footprinting assays indicated that AlgU could directly bind to the pslA promoter, and β-galactosidase activity analysis further revealed mutations of the AlgU-binding boxes drastically reduced the transcriptional activity of the pslA promoter; moreover, we also demonstrated that AlgU was positively regulated by RpoN at the transcriptional level and negatively regulated by the RNA-binding protein RsmA at the posttranscriptional level. Taken together, these data suggest that AlgU promotes EPS production and nitrogen-fixing biofilm formation by directly activating the transcription of pslA, and the expression of AlgU is controlled by RpoN and RsmA at different regulatory levels.
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Affiliation(s)
- Yahui Shao
- Biotechnology Research Institute, Chinese Academy of Agricultural Sciences, Beijing 100081, China; (Y.S.); (C.Y.); (F.L.); (S.J.); (S.W.); (Y.H.); (W.X.); (Y.M.); (J.Z.); (Y.Z.); (X.K.); (W.L.); (M.L.)
| | - Changyan Yin
- Biotechnology Research Institute, Chinese Academy of Agricultural Sciences, Beijing 100081, China; (Y.S.); (C.Y.); (F.L.); (S.J.); (S.W.); (Y.H.); (W.X.); (Y.M.); (J.Z.); (Y.Z.); (X.K.); (W.L.); (M.L.)
| | - Fanyang Lv
- Biotechnology Research Institute, Chinese Academy of Agricultural Sciences, Beijing 100081, China; (Y.S.); (C.Y.); (F.L.); (S.J.); (S.W.); (Y.H.); (W.X.); (Y.M.); (J.Z.); (Y.Z.); (X.K.); (W.L.); (M.L.)
| | - Shanshan Jiang
- Biotechnology Research Institute, Chinese Academy of Agricultural Sciences, Beijing 100081, China; (Y.S.); (C.Y.); (F.L.); (S.J.); (S.W.); (Y.H.); (W.X.); (Y.M.); (J.Z.); (Y.Z.); (X.K.); (W.L.); (M.L.)
| | - Shaoyu Wu
- Biotechnology Research Institute, Chinese Academy of Agricultural Sciences, Beijing 100081, China; (Y.S.); (C.Y.); (F.L.); (S.J.); (S.W.); (Y.H.); (W.X.); (Y.M.); (J.Z.); (Y.Z.); (X.K.); (W.L.); (M.L.)
| | - Yueyue Han
- Biotechnology Research Institute, Chinese Academy of Agricultural Sciences, Beijing 100081, China; (Y.S.); (C.Y.); (F.L.); (S.J.); (S.W.); (Y.H.); (W.X.); (Y.M.); (J.Z.); (Y.Z.); (X.K.); (W.L.); (M.L.)
| | - Wei Xue
- Biotechnology Research Institute, Chinese Academy of Agricultural Sciences, Beijing 100081, China; (Y.S.); (C.Y.); (F.L.); (S.J.); (S.W.); (Y.H.); (W.X.); (Y.M.); (J.Z.); (Y.Z.); (X.K.); (W.L.); (M.L.)
| | - Yiyuan Ma
- Biotechnology Research Institute, Chinese Academy of Agricultural Sciences, Beijing 100081, China; (Y.S.); (C.Y.); (F.L.); (S.J.); (S.W.); (Y.H.); (W.X.); (Y.M.); (J.Z.); (Y.Z.); (X.K.); (W.L.); (M.L.)
| | - Juan Zheng
- Biotechnology Research Institute, Chinese Academy of Agricultural Sciences, Beijing 100081, China; (Y.S.); (C.Y.); (F.L.); (S.J.); (S.W.); (Y.H.); (W.X.); (Y.M.); (J.Z.); (Y.Z.); (X.K.); (W.L.); (M.L.)
| | - Yuhua Zhan
- Biotechnology Research Institute, Chinese Academy of Agricultural Sciences, Beijing 100081, China; (Y.S.); (C.Y.); (F.L.); (S.J.); (S.W.); (Y.H.); (W.X.); (Y.M.); (J.Z.); (Y.Z.); (X.K.); (W.L.); (M.L.)
| | - Xiubin Ke
- Biotechnology Research Institute, Chinese Academy of Agricultural Sciences, Beijing 100081, China; (Y.S.); (C.Y.); (F.L.); (S.J.); (S.W.); (Y.H.); (W.X.); (Y.M.); (J.Z.); (Y.Z.); (X.K.); (W.L.); (M.L.)
| | - Wei Lu
- Biotechnology Research Institute, Chinese Academy of Agricultural Sciences, Beijing 100081, China; (Y.S.); (C.Y.); (F.L.); (S.J.); (S.W.); (Y.H.); (W.X.); (Y.M.); (J.Z.); (Y.Z.); (X.K.); (W.L.); (M.L.)
| | - Min Lin
- Biotechnology Research Institute, Chinese Academy of Agricultural Sciences, Beijing 100081, China; (Y.S.); (C.Y.); (F.L.); (S.J.); (S.W.); (Y.H.); (W.X.); (Y.M.); (J.Z.); (Y.Z.); (X.K.); (W.L.); (M.L.)
| | - Liguo Shang
- School of Basic Medicine, GuangXi University of Chinese Medicine, Nanning 530200, China
- Correspondence: (L.S.); (Y.Y.)
| | - Yongliang Yan
- Biotechnology Research Institute, Chinese Academy of Agricultural Sciences, Beijing 100081, China; (Y.S.); (C.Y.); (F.L.); (S.J.); (S.W.); (Y.H.); (W.X.); (Y.M.); (J.Z.); (Y.Z.); (X.K.); (W.L.); (M.L.)
- Correspondence: (L.S.); (Y.Y.)
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13
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Xie H, Muenke C, Sommer M, Buschmann S, Michel H. Production of Membrane Proteins in Pseudomonas stutzeri. Methods Mol Biol 2022; 2507:91-110. [PMID: 35773579 DOI: 10.1007/978-1-0716-2368-8_6] [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] [Indexed: 06/15/2023]
Abstract
Functional and structural studies on membrane proteins are often hampered by insufficient yields, misfolding and aggregation during the production and purification process. Escherichia coli is the most commonly used expression host for the production of recombinant prokaryotic integral membrane proteins. However, in many cases expression hosts other than E. coli are more appropriate for certain target proteins. Here, we report a convenient, systematically developed expression system using the γ-proteobacterium Pseudomonas stutzeri as an alternative production host for over-expression of integral membrane proteins. P. stutzeri can be easily and inexpensively cultured in large quantities. The Pseudomonas expression vectors are designed for inducible expression of affinity-tagged fusion proteins controlled by the PBAD promoter. This chapter provides detailed protocols of the different steps required to successfully produce and isolate recombinant membrane proteins with high yields in P. stutzeri.
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Affiliation(s)
- Hao Xie
- Department of Molecular Membrane Biology, Max Planck Institute of Biophysics, Frankfurt am Main, Germany
| | - Cornelia Muenke
- Department of Molecular Membrane Biology, Max Planck Institute of Biophysics, Frankfurt am Main, Germany
| | - Manuel Sommer
- Department of Molecular Membrane Biology, Max Planck Institute of Biophysics, Frankfurt am Main, Germany
| | - Sabine Buschmann
- Department of Molecular Membrane Biology, Max Planck Institute of Biophysics, Frankfurt am Main, Germany
| | - Hartmut Michel
- Department of Molecular Membrane Biology, Max Planck Institute of Biophysics, Frankfurt am Main, Germany.
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14
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Shimizu A, Tobe R, Aono R, Inoue M, Hagita S, Kiriyama K, Toyotake Y, Ogawa T, Kurihara T, Goto K, Prakash NT, Mihara H. Initial Step of Selenite Reduction via Thioredoxin for Bacterial Selenoprotein Biosynthesis. Int J Mol Sci 2021; 22:ijms222010965. [PMID: 34681630 PMCID: PMC8538045 DOI: 10.3390/ijms222010965] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/15/2021] [Revised: 10/05/2021] [Accepted: 10/08/2021] [Indexed: 12/11/2022] Open
Abstract
Many organisms reductively assimilate selenite to synthesize selenoprotein. Although the thioredoxin system, consisting of thioredoxin 1 (TrxA) and thioredoxin reductase with NADPH, can reduce selenite and is considered to facilitate selenite assimilation, the detailed mechanism remains obscure. Here, we show that selenite was reduced by the thioredoxin system from Pseudomonas stutzeri only in the presence of the TrxA (PsTrxA), and this system was specific to selenite among the oxyanions examined. Mutational analysis revealed that Cys33 and Cys36 residues in PsTrxA are important for selenite reduction. Free thiol-labeling assays suggested that Cys33 is more reactive than Cys36. Mass spectrometry analysis suggested that PsTrxA reduces selenite via PsTrxA-SeO intermediate formation. Furthermore, an in vivo formate dehydrogenase activity assay in Escherichia coli with a gene disruption suggested that TrxA is important for selenoprotein biosynthesis. The introduction of PsTrxA complemented the effects of TrxA disruption in E. coli cells, only when PsTrxA contained Cys33 and Cys36. Based on these results, we proposed the early steps of the link between selenite and selenoprotein biosynthesis via the formation of TrxA–selenium complexes.
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Affiliation(s)
- Atsuki Shimizu
- College of Life Sciences, Ritsumeikan University, 1-1-1 Nojihigashi, Kusatsu 525-8577, Shiga, Japan; (A.S.); (R.T.); (R.A.); (M.I.); (S.H.); (K.K.)
| | - Ryuta Tobe
- College of Life Sciences, Ritsumeikan University, 1-1-1 Nojihigashi, Kusatsu 525-8577, Shiga, Japan; (A.S.); (R.T.); (R.A.); (M.I.); (S.H.); (K.K.)
| | - Riku Aono
- College of Life Sciences, Ritsumeikan University, 1-1-1 Nojihigashi, Kusatsu 525-8577, Shiga, Japan; (A.S.); (R.T.); (R.A.); (M.I.); (S.H.); (K.K.)
| | - Masao Inoue
- College of Life Sciences, Ritsumeikan University, 1-1-1 Nojihigashi, Kusatsu 525-8577, Shiga, Japan; (A.S.); (R.T.); (R.A.); (M.I.); (S.H.); (K.K.)
- R-GIRO, Ritsumeikan University, 1-1-1 Nojihigashi, Kusatsu 525-8577, Shiga, Japan
| | - Satoru Hagita
- College of Life Sciences, Ritsumeikan University, 1-1-1 Nojihigashi, Kusatsu 525-8577, Shiga, Japan; (A.S.); (R.T.); (R.A.); (M.I.); (S.H.); (K.K.)
| | - Kaito Kiriyama
- College of Life Sciences, Ritsumeikan University, 1-1-1 Nojihigashi, Kusatsu 525-8577, Shiga, Japan; (A.S.); (R.T.); (R.A.); (M.I.); (S.H.); (K.K.)
| | - Yosuke Toyotake
- Institute for Chemical Research, Kyoto University, Gokasho, Uji 611-0011, Kyoto, Japan; (Y.T.); (T.O.); (T.K.)
| | - Takuya Ogawa
- Institute for Chemical Research, Kyoto University, Gokasho, Uji 611-0011, Kyoto, Japan; (Y.T.); (T.O.); (T.K.)
| | - Tatsuo Kurihara
- Institute for Chemical Research, Kyoto University, Gokasho, Uji 611-0011, Kyoto, Japan; (Y.T.); (T.O.); (T.K.)
| | - Kei Goto
- Department of Chemistry, School of Science, Tokyo Institute of Technology, 2-12-1 Ookayama, Meguro-ku, Tokyo 152-8551, Japan;
| | - N. Tejo Prakash
- School of Energy and Environment, Thapar Institute of Engineering and Technology, Patiala 147004, Punjab, India;
| | - Hisaaki Mihara
- College of Life Sciences, Ritsumeikan University, 1-1-1 Nojihigashi, Kusatsu 525-8577, Shiga, Japan; (A.S.); (R.T.); (R.A.); (M.I.); (S.H.); (K.K.)
- Correspondence: ; Tel.: +81-(0)77-561-2732
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15
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Yang K, Wang Q, Wang Y, Li S, Gu Y, Gao N, Zhang F, Lei P, Wang R, Xu H. Poly(γ-glutamic acid) Nanocoating To Enhance the Viability of Pseudomonas stutzeri NRCB010 through Cell Surface Engineering. ACS Appl Mater Interfaces 2021; 13:39957-39966. [PMID: 34376049 DOI: 10.1021/acsami.1c12538] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/13/2023]
Abstract
Microbial inoculants can enhance soil quality, promote plant nutrient acquisition, and alleviate problems caused by the excessive use of chemical fertilizers. However, susceptibility to harsh conditions during transport and storage, as well as the short shelf-life of plant growth-promoting rhizobacteria (PGPR), limit industrial application. Herein, a novel strategy to form nanocoating on bacterial surfaces to enhance viability was proposed. The nanocoating was composed of N-hydroxysuccinimide (NHS)-modified poly (γ-glutamic acid) (γ-PGA) and calcium ions, which could adhere to the surface of bacteria by forming covalent bonds and ionic bonds with the bacteria. The bacteria encapsulated in the coating had better resistance against harsh conditions than bare bacteria. The viability of coated bacteria was also increased by 2.38 times compared with bare bacteria after 4 weeks of storage. The pot experiment showed that coated Pseudomonas stutzeri NRCB010 had better growth-promoting properties compared with free P. stutzeri NRCB010. These results indicate that cell surface engineering is an effective method to enhance the resistance of bacteria against harsh conditions and is expected to promote the widespread use of PGPR.
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Affiliation(s)
- Kai Yang
- State Key Laboratory of Materials-Oriented Chemical Engineering, Nanjing 211816, China
- College of Food Science and Light Industry, Nanjing Tech University, Nanjing 211816, China
| | - Qian Wang
- State Key Laboratory of Materials-Oriented Chemical Engineering, Nanjing 211816, China
- College of Food Science and Light Industry, Nanjing Tech University, Nanjing 211816, China
| | - Yu Wang
- State Key Laboratory of Materials-Oriented Chemical Engineering, Nanjing 211816, China
- College of Food Science and Light Industry, Nanjing Tech University, Nanjing 211816, China
| | - Sha Li
- State Key Laboratory of Materials-Oriented Chemical Engineering, Nanjing 211816, China
- College of Food Science and Light Industry, Nanjing Tech University, Nanjing 211816, China
| | - Yian Gu
- State Key Laboratory of Materials-Oriented Chemical Engineering, Nanjing 211816, China
- College of Food Science and Light Industry, Nanjing Tech University, Nanjing 211816, China
| | - Nan Gao
- State Key Laboratory of Materials-Oriented Chemical Engineering, Nanjing 211816, China
- College of Food Science and Light Industry, Nanjing Tech University, Nanjing 211816, China
| | - Fuhai Zhang
- Agricultural and Rural Affairs of Yantai, Yantai 264000, China
| | - Peng Lei
- State Key Laboratory of Materials-Oriented Chemical Engineering, Nanjing 211816, China
- College of Food Science and Light Industry, Nanjing Tech University, Nanjing 211816, China
| | - Rui Wang
- State Key Laboratory of Materials-Oriented Chemical Engineering, Nanjing 211816, China
- College of Food Science and Light Industry, Nanjing Tech University, Nanjing 211816, China
| | - Hong Xu
- State Key Laboratory of Materials-Oriented Chemical Engineering, Nanjing 211816, China
- College of Food Science and Light Industry, Nanjing Tech University, Nanjing 211816, China
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16
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Zhang H, Song L, Chen X, Li P. An Exploration of Seaweed Polysaccharides Stimulating Denitrifying Bacteria for Safer Nitrate Removal. Molecules 2021; 26:molecules26113390. [PMID: 34205200 PMCID: PMC8200018 DOI: 10.3390/molecules26113390] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/17/2021] [Revised: 06/01/2021] [Accepted: 06/01/2021] [Indexed: 11/16/2022] Open
Abstract
Excessive use of nitrogen fertilizer in intensively managed agriculture has resulted in abundant accumulation of nitrate in soil, which limits agriculture sustainability. How to reduce nitrate content is the key to alleviate secondary soil salinization. However, the microorganisms used in soil remediation cause some problems such as weak efficiency and short survival time. In this study, seaweed polysaccharides were used as stimulant to promote the rapid growth and safer nitrate removal of denitrifying bacteria. Firstly, the growth rate and NO3−-N removal capacity of three kinds of denitrifying bacteria, Bacillus subtilis (BS), Pseudomonas stutzeri (PS) and Pseudomonas putida (PP), were compared. The results showed that Bacillus subtilis (BS) had a faster growth rate and stronger nitrate removal ability. We then studied the effects of Enteromorpha linza polysaccharides (EP), carrageenan (CA), and sodium alginate (AL) on growth and denitrification performance of Bacillus subtilis (BS). The results showed that seaweed polysaccharides obviously promoted the growth of Bacillus subtilis (BS), and accelerated the reduction of NO3−-N. More importantly, the increased NH4+-N content could avoid excessive loss of nitrogen, and less NO2−-N accumulation could avoid toxic effects on plants. This new strategy of using denitrifying bacteria for safely remediating secondary soil salinization has a great significance.
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Affiliation(s)
- Hui Zhang
- College of Marine Science and Biological Engineering, Qingdao University of Science and Technology, Qingdao 266042, China; (H.Z.); (L.S.)
- CAS and Shandong Province Key Laboratory of Experimental Marine Biology, Center for Ocean Mega-Science, Institute of Oceanology, Chinese Academy of Sciences, Qingdao 266071, China
- University of Chinese Academy of Sciences, Beijing 100049, China
| | - Lin Song
- College of Marine Science and Biological Engineering, Qingdao University of Science and Technology, Qingdao 266042, China; (H.Z.); (L.S.)
| | - Xiaolin Chen
- CAS and Shandong Province Key Laboratory of Experimental Marine Biology, Center for Ocean Mega-Science, Institute of Oceanology, Chinese Academy of Sciences, Qingdao 266071, China
- Laboratory for Marine Drugs and Bioproducts, Pilot National Laboratory for Marine Science and Technology (Qingdao), No. 1 Wenhai Road, Qingdao 266237, China
- Correspondence: (X.C.); (P.L.); Tel.: +86-0532-82898702 (X.C.); +86-0532-82898707 (P.L.)
| | - Pengcheng Li
- CAS and Shandong Province Key Laboratory of Experimental Marine Biology, Center for Ocean Mega-Science, Institute of Oceanology, Chinese Academy of Sciences, Qingdao 266071, China
- Laboratory for Marine Drugs and Bioproducts, Pilot National Laboratory for Marine Science and Technology (Qingdao), No. 1 Wenhai Road, Qingdao 266237, China
- Correspondence: (X.C.); (P.L.); Tel.: +86-0532-82898702 (X.C.); +86-0532-82898707 (P.L.)
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17
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Lu C, Yang Z, Liu J, Liao Q, Ling W, Waigi MG, Odinga ES. Chlorpyrifos inhibits nitrogen fixation in rice-vegetated soil containing Pseudomonas stutzeri A1501. Chemosphere 2020; 256:127098. [PMID: 32470732 DOI: 10.1016/j.chemosphere.2020.127098] [Citation(s) in RCA: 17] [Impact Index Per Article: 4.3] [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: 01/17/2020] [Revised: 03/30/2020] [Accepted: 05/14/2020] [Indexed: 05/28/2023]
Abstract
Chlorpyrifos, a common organophosphorus pesticide, is widely used for agricultural pest control and can inhibit nitrogen-fixing bacteria biomass in paddy. In this study, the additions of chlorpyrifos (1 and 8 mg kg-1) to soil, with or without Pseudomonas stutzeri A1501, resulted in a significant decrease in nitrogen fixation, despite insignificant effects on the abundances of P. stutzeri A1501 and bacteria in soil. Toxic effect of chlorpyrifos on P. stutzeri A1501 nitrogenase activity in medium was also observed, accompanied by a significant reduction in the expression of nitrogen-fixing related genes (nifA and nifH). Furthermore, rhizosphere colonization and biofilm formation by P. stutzeri A1501 were repressed by chlorpyrifos, leading to decreased nitrogenase activity in the rhizosphere. Biofilm formation in medium was inhibited by bacterial hyperkinesis and reduction of extracellular polymeric substance, including exopolysaccharides and proteins. Together, these findings showed that chlorpyrifos-induced production of reactive oxygen species (ROS) which was directly responsible for reduced nitrogenase activity in the medium, soil, and rhizosphere by inhibiting the expressions of nitrogen-fixing related genes. Furthermore, the inhibition of biofilm formation by chlorpyrifos or ROS likely aggravated the reduction in rhizospherere nitrogenase activity. These findings provide potentially valuable insights into the toxicity of chlorpyrifos on nitrogen-fixing bacteria and its mechanisms. Furthermore, for sustainable rice production, it is necessary to evaluate whether other pesticides affect nitrogen fixation and select pesticides that do not inhibit nitrogen fixation.
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Affiliation(s)
- Chao Lu
- Institute of Organic Contaminant Control and Soil Remediation, College of Resources and Environmental Sciences, Nanjing Agricultural University, Nanjing, 210095, China
| | - Zhimin Yang
- National Key Facility for Crop Gene Resources and Genetic Improvement, Biotechnology Research Institute, Chinese Academy of Agricultural Sciences, Beijing, 100081, China
| | - Juan Liu
- Institute of Organic Contaminant Control and Soil Remediation, College of Resources and Environmental Sciences, Nanjing Agricultural University, Nanjing, 210095, China
| | - Qihang Liao
- Institute of Organic Contaminant Control and Soil Remediation, College of Resources and Environmental Sciences, Nanjing Agricultural University, Nanjing, 210095, China
| | - Wanting Ling
- Institute of Organic Contaminant Control and Soil Remediation, College of Resources and Environmental Sciences, Nanjing Agricultural University, Nanjing, 210095, China.
| | - Michael Gatheru Waigi
- Institute of Organic Contaminant Control and Soil Remediation, College of Resources and Environmental Sciences, Nanjing Agricultural University, Nanjing, 210095, China
| | - Emmanuel Stephen Odinga
- Institute of Organic Contaminant Control and Soil Remediation, College of Resources and Environmental Sciences, Nanjing Agricultural University, Nanjing, 210095, China
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Rattanasuk S, Songsaeng A, Sriwarom T. <i>Pseudomonas stutzeri </i> CM1, Novel Thermotolerant Cellulase- Producing Bacteria Isolated from Forest Soil. Pak J Biol Sci 2020; 23:1345-1350. [PMID: 32981269 DOI: 10.3923/pjbs.2020.1345.1350] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
Abstract
BACKGROUND AND OBJECTIVE Cellulase is an important enzyme that useful for agricultural residue hydrolysis such as plant stover, molasse, rice straw. Thermotolerant cellulases are required to apply in textile, food, detergent, biofuels and pharmaceutical applications. This research aimed to isolate the thermotolerant cellulase-producing bacteria from forest soil and to determine cellulase activity from isolated bacteria. MATERIALS AND METHODS Soil samples were collected from the Roi Et Rajabhat University forest. One gram of soil sample was mixed with Luria-Bertani (LB) broth medium and incubated at 37°C with shaking at 150 rpm for 24 h. The cultured broth was streaked on LB agar plate and incubated at 37°C for 24 h. Cellulase-producing bacteria were isolated using Carboxymethylcellulose (CMC) agar plate. Four bacterial isolates which presented a clear zone on CMC agar plate after flooded with iodine solution, named CM1, CM2, CM3 and CM4. Cellulase activity of 4 isolated bacteria was determined against various pH (pH 4-8) and temperature (50-100°C). RESULTS The results indicated that CM1 isolate showed the highest cellulase activity at 0.074 unit mL-1 at 80°C and pH5. All isolates were identified using 16S rRNA gene sequencing. The results indicated that CM1, CM3 and CM4 were identified as Pseudomonas stutzeri. while isolate CM2 was Bacillus subtilis. CONCLUSION This is the first report presenting the thermotolerant cellulase produced by Pseudomonas stutzeri. The thermotolerant cellulase produced from Pseudomonas stutzeri in this study will be useful in many industrial processes using cellulase at high temperatures.
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Qian Y, Zhang Y, Zuh AA, Qiao W. New application of rutin: Repair the toxicity of emerging perfluoroalkyl substance to Pseudomonas stutzeri. Ecotoxicol Environ Saf 2020; 201:110879. [PMID: 32559694 DOI: 10.1016/j.ecoenv.2020.110879] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [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: 03/24/2020] [Revised: 06/03/2020] [Accepted: 06/08/2020] [Indexed: 06/11/2023]
Abstract
Per- and polyfluoroalkyl substances (PFASs) are toxic to microorganisms, thereby affecting microbial communities in sludge and soil, but how to repair the toxicity of microorganisms remains unclear. In this study, rutin, an antioxidant, was added into a culture medium with an aerobic denitrification bacteria, Pseudomonas stutzeri, under the exposure of sodium perfluorononyloxy-benzenesulfonate (OBS) to evaluate the repair mechanisms of rutin to the toxicity of OBS to the bacteria. The results showed that rutin could repair the damage of OBS to cell structures, and reduce the death rates of the bacteria under OBS exposure. The dosage of rutin reduced the effect on the inhibition of denitrification ability of P. stutzeri under OBS exposure. Compared with the bacteria exposed to single OBS, the dosage of rutin resulted in that the death rates recovered from 96.2% to 66.4%, the growth inhibition rate decreased from 46.5% to 15.8%, the total nitrogen removal rate recovered from 66.9% to 100%, and the NO2- content recovered from 34.5 mg/L to 0.22 mg/L. The expressions of key denitrification genes (napA, nirS, norB, nosZ) were recovered after adding rutin under OBS exposure. Rutin changed the positive rate of reactive oxygen species, the relative superoxide dismutase and catalase activities in the bacteria which exposed to OBS. The mechanism by which rutin repaired the toxicity of OBS to P. stutzeri related to inhibiting the activities of antioxidant and denitrification enzymes rather than affecting the expressions of genes involved in these enzymes. This study sheds light on the repair method of micro-organics and reveals the repair mechanisms under PFASs exposure.
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Affiliation(s)
- Yi Qian
- Department of Environmental Engineering, College of Biology and the Environment, Nanjing Forestry University, Nanjing, 210037, China
| | - Yunhao Zhang
- Department of Environmental Engineering, College of Biology and the Environment, Nanjing Forestry University, Nanjing, 210037, China
| | - Achuo Anitta Zuh
- Department of Environmental Engineering, College of Biology and the Environment, Nanjing Forestry University, Nanjing, 210037, China
| | - Weichuan Qiao
- Department of Environmental Engineering, College of Biology and the Environment, Nanjing Forestry University, Nanjing, 210037, China.
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20
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Chen L, Lin J, Pan D, Ren Y, Zhang J, Zhou B, Chen L, Lin J. Ammonium Removal by a Newly Isolated Heterotrophic Nitrification-Aerobic Denitrification Bacteria Pseudomonas Stutzeri SDU10 and Its Potential in Treatment of Piggery Wastewater. Curr Microbiol 2020; 77:2792-2801. [PMID: 32556477 DOI: 10.1007/s00284-020-02085-1] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/26/2019] [Accepted: 06/08/2020] [Indexed: 11/26/2022]
Abstract
A strain SDU10 was isolated from swine manure compost and identified as Pseudomonas stutzeri SDU10. It demonstrated excellent capability in NH4+-N removal. Optimal conditions of NH4+-N removal were determined, which were sodium acetate as the optimal carbon source, carbon to nitrogen (C/N) ratio of 10, temperature of 30 °C, pH of 7.0. Especially, P. stutzeri SDU10 could remove high concentration NH4+-N of 1500.0 and 2000.0 mg/l in 120 h with the NH4+-N removal rates of 91.1% and 61.6%, respectively. In batch experiments, the highest NH4+-N removal rate of 97.6% and chemical oxygen demand (COD) removal rate of 94.2% were obtained at initial C/N ratio 10 during piggery wastewater treatment using P. stutzeri SDU10. Results showed that P. stutzeri SDU10 had the potential for treatment of wastewater of high NH4+-N concentration.
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Affiliation(s)
- Lifei Chen
- State Key Laboratory of Microbial Technology, Microbial Technology Institute, Shandong University, Qingdao, 266237, PR China
| | - Jianqiang Lin
- State Key Laboratory of Microbial Technology, Microbial Technology Institute, Shandong University, Qingdao, 266237, PR China
| | - Deng Pan
- Shandong Engineering Laboratory of Treatment and Resource Utilization of Waste From Planting and Breeding Industry, Shandong Yian Bioengineering Co., Ltd, Jinan, 250014, PR China
| | - Yilin Ren
- Qingdao Longding Biotech Co., Ltd, Qingdao, 266109, PR China
| | - Juan Zhang
- Shandong Institute for Product Quality Inspection, Jinan, 250102, PR China
| | - Bo Zhou
- College of Life Sciences, Shandong Agricultural University, Taian, 271018, PR China
| | - Linxu Chen
- State Key Laboratory of Microbial Technology, Microbial Technology Institute, Shandong University, Qingdao, 266237, PR China.
| | - Jianqun Lin
- State Key Laboratory of Microbial Technology, Microbial Technology Institute, Shandong University, Qingdao, 266237, PR China.
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Hu B, Wang M, Geng S, Wen L, Wu M, Nie Y, Tang YQ, Wu XL. Metabolic Exchange with Non-Alkane-Consuming Pseudomonas stutzeri SLG510A3-8 Improves n-Alkane Biodegradation by the Alkane Degrader Dietzia sp. Strain DQ12-45-1b. Appl Environ Microbiol 2020; 86:AEM.02931-19. [PMID: 32033953 PMCID: PMC7117941 DOI: 10.1128/aem.02931-19] [Citation(s) in RCA: 23] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/16/2019] [Accepted: 02/05/2020] [Indexed: 02/07/2023] Open
Abstract
Biodegradation of alkanes by microbial communities is ubiquitous in nature. Interestingly, the microbial communities with high hydrocarbon-degrading performances are sometimes composed of not only hydrocarbon degraders but also nonconsumers, but the synergistic mechanisms remain unknown. Here, we found that two bacterial strains isolated from Chinese oil fields, Dietzia sp. strain DQ12-45-1b and Pseudomonas stutzeri SLG510A3-8, had a synergistic effect on hexadecane (C16 compound) biodegradation, even though P. stutzeri could not utilize C16 individually. To gain a better understanding of the roles of the alkane nonconsumer P. stutzeri in the C16-degrading consortium, we reconstructed a two-species stoichiometric metabolic model, iBH1908, and integrated in silico prediction with the following in vitro validation, a comparative proteomics analysis, and extracellular metabolomic detection. Metabolic interactions between P. stutzeri and Dietzia sp. were successfully revealed to have importance in efficient C16 degradation. In the process, P. stutzeri survived on C16 metabolic intermediates from Dietzia sp., including hexadecanoate, 3-hydroxybutanoate, and α-ketoglutarate. In return, P. stutzeri reorganized its metabolic flux distribution to fed back acetate and glutamate to Dietzia sp. to enhance its C16 degradation efficiency by improving Dietzia cell accumulation and by regulating the expression of Dietzia succinate dehydrogenase. By using the synergistic microbial consortium of Dietzia sp. and P. stutzeri with the addition of the in silico-predicted key exchanged metabolites, diesel oil was effectively disposed of in 15 days with a removal fraction of 85.54% ± 6.42%, leaving small amounts of C15 to C20 isomers. Our finding provides a novel microbial assembling mode for efficient bioremediation or chemical production in the future.IMPORTANCE Many natural and synthetic microbial communities are composed of not only species whose biological properties are consistent with their corresponding communities but also ones whose chemophysical characteristics do not directly contribute to the performance of their communities. Even though the latter species are often essential to the microbial communities, their roles are unclear. Here, by investigation of an artificial two-member microbial consortium in n-alkane biodegradation, we showed that the microbial member without the n-alkane-degrading capability had a cross-feeding interaction with and metabolic regulation to the leading member for the synergistic n-alkane biodegradation. Our study improves the current understanding of microbial interactions. Because "assistant" microbes showed importance in communities in addition to the functional microbes, our findings also suggest a useful "assistant-microbe" principle in the design of microbial communities for either bioremediation or chemical production.
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Affiliation(s)
- Bing Hu
- Institute for Synthetic Biosystems, Department of Biochemical Engineering, College of Chemistry and Chemical Engineering, Beijing Institute of Technology, Beijing, People's Republic of China
- Department of Energy and Resource Engineering, College of Engineering, Peking University, Beijing, People's Republic of China
| | - Miaoxiao Wang
- Department of Energy and Resource Engineering, College of Engineering, Peking University, Beijing, People's Republic of China
| | - Shuang Geng
- Department of Energy and Resource Engineering, College of Engineering, Peking University, Beijing, People's Republic of China
| | - Liqun Wen
- Department of Energy and Resource Engineering, College of Engineering, Peking University, Beijing, People's Republic of China
| | - Mengdi Wu
- School of Pharmacy, China Pharmaceutical University, Nanjing, People's Republic of China
| | - Yong Nie
- Department of Energy and Resource Engineering, College of Engineering, Peking University, Beijing, People's Republic of China
| | - Yue-Qin Tang
- Department of Architecture and Environment, Sichuan University, Chengdu, People's Republic of China
| | - Xiao-Lei Wu
- Department of Energy and Resource Engineering, College of Engineering, Peking University, Beijing, People's Republic of China
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22
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Paul K, Saha C, Nag M, Mandal D, Naiya H, Sen D, Mitra S, Kumar M, Bose D, Mukherjee G, Naskar N, Lahiri S, Das Ghosh U, Tripathi S, Sarkar MP, Banerjee M, Kleinert A, Valentine AJ, Tripathy S, Sinharoy S, Seal A. A Tripartite Interaction among the Basidiomycete Rhodotorula mucilaginosa, N 2-Fixing Endobacteria, and Rice Improves Plant Nitrogen Nutrition. Plant Cell 2020; 32:486-507. [PMID: 31757927 PMCID: PMC7008492 DOI: 10.1105/tpc.19.00385] [Citation(s) in RCA: 22] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/04/2019] [Revised: 10/25/2019] [Accepted: 11/19/2019] [Indexed: 05/21/2023]
Abstract
Nitrogen (N) limits crop yield, and improvement of N nutrition remains a key goal for crop research; one approach to improve N nutrition is identifying plant-interacting, N2-fixing microbes. Rhodotorula mucilaginosa JGTA-S1 is a basidiomycetous yeast endophyte of narrowleaf cattail (Typha angustifolia). JGTA-S1 could not convert nitrate or nitrite to ammonium but harbors diazotrophic (N2-fixing) endobacteria (Pseudomonas stutzeri) that allow JGTA-S1 to fix N2 and grow in a N-free environment; moreover, P. stutzeri dinitrogen reductase was transcribed in JGTA-S1 even under adequate N. Endobacteria-deficient JGTA-S1 had reduced fitness, which was restored by reintroducing P. stutzeri JGTA-S1 colonizes rice (Oryza sativa), significantly improving its growth, N content, and relative N-use efficiency. Endofungal P. stutzeri plays a significant role in increasing the biomass and ammonium content of rice treated with JGTA-S1; also, JGTA-S1 has better N2-fixing ability than free-living P. stutzeri and provides fixed N to the plant. Genes involved in N metabolism, N transporters, and NODULE INCEPTION-like transcription factors were upregulated in rice roots within 24 h of JGTA-S1 treatment. In association with rice, JGTA-S1 has a filamentous phase and P. stutzeri only penetrated filamentous JGTA-S1. Together, these results demonstrate an interkingdom interaction that improves rice N nutrition.
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Affiliation(s)
- Karnelia Paul
- Department of Biotechnology and Dr. B.C. Guha Centre for Genetic Engineering and Biotechnology, University of Calcutta, Kolkata 700019, India
| | - Chinmay Saha
- Department of Biotechnology and Dr. B.C. Guha Centre for Genetic Engineering and Biotechnology, University of Calcutta, Kolkata 700019, India
- Department of Endocrinology & Metabolism, Institute of Post Graduate Medical Education & Research and SSKM Hospital, Kolkata 700020, West Bengal, India
| | - Mayurakshi Nag
- Department of Biotechnology and Dr. B.C. Guha Centre for Genetic Engineering and Biotechnology, University of Calcutta, Kolkata 700019, India
| | - Drishti Mandal
- National Institute of Plant Genome Research, New Delhi 110067, India
| | - Haraprasad Naiya
- Department of Biotechnology and Dr. B.C. Guha Centre for Genetic Engineering and Biotechnology, University of Calcutta, Kolkata 700019, India
- ICAR-Indian Institute of Natural Resins and Gums Namkum, Ranchi 834010, Jharkhand, India
| | - Diya Sen
- Department of Plant Protection Biology, Swedish University of Agricultural Sciences, Stockholm, SE 75007, Sweden
- Computational Genomics Laboratory, Structural Biology and Bioinformatics Division, Council of Scientific and Industrial Research-Indian Institute of Chemical Biology, Kolkata 700032, India
| | - Souvik Mitra
- Department of Botany, Darjeeling Government College, Darjeeling 734101, India
| | - Mohit Kumar
- Kusuma School of Biological Sciences, Indian Institute of Technology Delhi, New Delhi 110016, India
| | - Dipayan Bose
- Crystallography and Molecular Biology Division, Saha Institute of Nuclear Physics, Kolkata 700064, India
| | - Gairik Mukherjee
- Department of Biotechnology and Dr. B.C. Guha Centre for Genetic Engineering and Biotechnology, University of Calcutta, Kolkata 700019, India
| | - Nabanita Naskar
- Saha Institute of Nuclear Physics, Kolkata 700064, India
- Department of Environmental Science, University of Calcutta, Kolkata 700019, India
| | - Susanta Lahiri
- Saha Institute of Nuclear Physics, Kolkata 700064, India
| | - Upal Das Ghosh
- P.G. Department of Botany, Bidhannagar College, Kolkata 700026, India
| | - Sudipta Tripathi
- Agricultural Experimental Farm, Institute of Agricultural Science, University of Calcutta, Kolkata 700144, India
| | | | - Manidipa Banerjee
- Kusuma School of Biological Sciences, Indian Institute of Technology Delhi, New Delhi 110016, India
| | - Aleysia Kleinert
- Botany & Zoology Department, University of Stellenbosch Private Bag X1 Matieland 7602 South Africa
| | - Alexander J Valentine
- Botany & Zoology Department, University of Stellenbosch Private Bag X1 Matieland 7602 South Africa
| | - Sucheta Tripathy
- Computational Genomics Laboratory, Structural Biology and Bioinformatics Division, Council of Scientific and Industrial Research-Indian Institute of Chemical Biology, Kolkata 700032, India
| | - Senjuti Sinharoy
- National Institute of Plant Genome Research, New Delhi 110067, India
| | - Anindita Seal
- Department of Biotechnology and Dr. B.C. Guha Centre for Genetic Engineering and Biotechnology, University of Calcutta, Kolkata 700019, India
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Han K, Hong U, Kim YW, Kwon S, Kim Y. Assessing the feasibility of sequential aerobic respiration and heterotrophic denitrification of a high-strength mixture of phenol and its derivatives in the field single-well-drift test. Chemosphere 2020; 239:124800. [PMID: 31526993 DOI: 10.1016/j.chemosphere.2019.124800] [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: 04/02/2019] [Revised: 09/03/2019] [Accepted: 09/05/2019] [Indexed: 06/10/2023]
Abstract
Biological degradation of high strength phenol and its derivatives in groundwater is problematic because these compounds are toxic to human and microbes. To evaluate the feasibility of in situ bioremediation using sequential aerobic respiration and heterotrophic denitrification, a field single-well-drift test (SWDT) was conducted in groundwater contaminated with coal tar distillates. To stimulate indigenous phenol degrading microorganisms, a 1400 L of oxygen-saturated test solution containing bromide (3.96 ± 0.179 mmol-Br/L) and nitrate (5.34 ± 0.187 mmol NO3--N/L) was injected into an aquifer. After injection of the test solution, significant consumption of dissolved oxygen (DO) was immediately observed; then, degradation of the methyl derivatives o-cresol and m,p-cresol was observed with average zero-order rate coefficients of 0.047 mmol/L/d and 0.23 mmol/L/d, respectively. After 73% of the injected DO was consumed, significant NO3- consumption was observed along with degradation of phenol and the dimethyl derivatives 2,4-xylenol and 3,5-xylenol, which had average zero-order rate coefficients of 0.17 mmol/L/d, 0.060 mmol/L/d, and 0.018 mmol/L/d, respectively. The production of CO2, NO2-, and N2O along with significant consumption of DO and NO3- suggest that phenolic compounds were biologically degraded by sequential aerobic respiration and heterotrophic denitrification. The results of 16s RNA analysis revealed that, after injection of the test solution, a bacterium that shared a 99% 16s rRNA sequence similarity with an uncultured bacterium revealed to be Pseudomonas stutzeri, a facultative heterotrophic denitrifier, was found in the aquifer. Thus, these results suggest that simultaneous injection of DO and NO3- is an appropriate in situ bioremediation strategy for degrading mixtures of high-strength phenolic compounds in an aquifer.
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Affiliation(s)
- Kyungjin Han
- Department of Environmental Engineering, Korea University, Sejong, 30019, Republic of Korea
| | - Uijeon Hong
- Department of Environmental Engineering, Korea University, Sejong, 30019, Republic of Korea; KE Tech Incorporated, Daejeon, 34016, Republic of Korea
| | - Young-Wan Kim
- Department of Food and Biotechnology, Korea University, Sejong, 30019, Republic of Korea
| | - Sooyoul Kwon
- Department of Environmental Health, Korea National Open University, Seoul, 110-791, Republic of Korea
| | - Young Kim
- Department of Environmental Engineering, Korea University, Sejong, 30019, Republic of Korea.
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Yu Y, An Q, Zhou Y, Deng S, Miao Y, Zhao B, Yang L. Highly synergistic effects on ammonium removal by the co-system of Pseudomonas stutzeri XL-2 and modified walnut shell biochar. Bioresour Technol 2019; 280:239-246. [PMID: 30772636 DOI: 10.1016/j.biortech.2019.02.037] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [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: 12/16/2018] [Revised: 02/05/2019] [Accepted: 02/06/2019] [Indexed: 06/09/2023]
Abstract
Pseudomonas stutzeri strain XL-2 presented efficient ammonium removal due to heterotrophic nitrification-aerobic denitrification. The modified walnut shell biochar also showed ammonium adsorption due to chemical interaction. The complex of modified biochar and strain XL-2 exhibited excellent synergistic effects on ammonium removal, especially in unfavorable environment. The maximum average ammonium removal rate of the complex was 4.40 mg·L-1·h-1, which was 3.01 times higher than that of pure bacteria and 5.57 times higher than that of biochar. A large number of irregular pores and hydrophilic functional groups promoted the immobilization of strain XL-2 on biochar. Adsorption of ammonium, high specific surface area and release of Mg2+ by biochar enhanced biodegradation of strain XL-2. Approximately 96.34%-98.73% of ammonium was removed in a sequencing batch reactor (SBR) inoculating with the complex of strain XL-2 and biochar, which was much higher than the treatment efficiency of free bacteria in SBR.
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Affiliation(s)
- Yang Yu
- Key Laboratory of the Three Gorges Reservoir Region's Eco-Environment, Ministry of Education, Chongqing University, Chongqing 400045, PR China
| | - Qiang An
- Key Laboratory of the Three Gorges Reservoir Region's Eco-Environment, Ministry of Education, Chongqing University, Chongqing 400045, PR China; National Centre for International Research of Low-carbon and Green Buildings, Chongqing University, Chongqing 400045, PR China.
| | - Ying Zhou
- Key Laboratory of the Three Gorges Reservoir Region's Eco-Environment, Ministry of Education, Chongqing University, Chongqing 400045, PR China
| | - Shuman Deng
- Key Laboratory of the Three Gorges Reservoir Region's Eco-Environment, Ministry of Education, Chongqing University, Chongqing 400045, PR China
| | - Yue Miao
- Key Laboratory of the Three Gorges Reservoir Region's Eco-Environment, Ministry of Education, Chongqing University, Chongqing 400045, PR China.
| | - Bin Zhao
- Key Laboratory of the Three Gorges Reservoir Region's Eco-Environment, Ministry of Education, Chongqing University, Chongqing 400045, PR China; National Centre for International Research of Low-carbon and Green Buildings, Chongqing University, Chongqing 400045, PR China.
| | - Li Yang
- Key Laboratory of the Three Gorges Reservoir Region's Eco-Environment, Ministry of Education, Chongqing University, Chongqing 400045, PR China
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Wang D, Xia X, Wu S, Zheng S, Wang G. The essentialness of glutathione reductase GorA for biosynthesis of Se(0)-nanoparticles and GSH for CdSe quantum dot formation in Pseudomonas stutzeri TS44. J Hazard Mater 2019; 366:301-310. [PMID: 30530022 DOI: 10.1016/j.jhazmat.2018.11.092] [Citation(s) in RCA: 22] [Impact Index Per Article: 4.4] [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: 03/04/2018] [Revised: 10/21/2018] [Accepted: 11/22/2018] [Indexed: 05/22/2023]
Abstract
Pseudomonas stutzeri TS44 was able to aerobically reduce Se(IV) into SeNPs and transform Se(IV)/Cd(II) mixture into CdSe-QDs. The SeNPs and CdSe-QDs were systematically characterized by surface feature analyses, and the molecular mechanisms of SeNPs and CdSe-QD formation in P. stutzeri TS44 were characterized in detail. In vivo, under 2.5 mmol/L Se(IV) exposure, GorA was essential for catalyzing of Se(IV) reduction rate decreased by 67% when the glutathione reductase gene gorA was disrupted, but it was not decreased in the glutathione synthesis rate-limiting gene gshA mutated strain compared to the wild type. The complemented strains restored the phenotypes. While under low amount of Se(IV) (0.5 mmol/L), GSH played an important role for Se(IV) reduction. In vitro, GorA catalyzed Se(IV) reduction with NADPH as the electron donor (Vmax of 3.947 ± 0.1061 μmol/min/mg protein under pH 7.0 and 28℃). In addition, CdSe-QDs were successfully synthesized by a one-step method in which Se(IV) and Cd(II) were added to bacterial culture simultaneously. GSH rather than GorA is necessary for CdSe-QD formation in vivo and in vitro. In conclusion, the results provide new findings showing that GorA functions as a selenite reductase under high amount Se(IV) and GSH is essential for bacterial CdSe-QD synthesis.
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Affiliation(s)
- Dan Wang
- State Key Laboratory of Agricultural Microbiology, College of Life Science and Technology, Huazhong Agricultural University, Wuhan 430070, PR China
| | - Xian Xia
- State Key Laboratory of Agricultural Microbiology, College of Life Science and Technology, Huazhong Agricultural University, Wuhan 430070, PR China
| | - Shijuan Wu
- State Key Laboratory of Agricultural Microbiology, College of Life Science and Technology, Huazhong Agricultural University, Wuhan 430070, PR China
| | - Shixue Zheng
- State Key Laboratory of Agricultural Microbiology, College of Life Science and Technology, Huazhong Agricultural University, Wuhan 430070, PR China
| | - Gejiao Wang
- State Key Laboratory of Agricultural Microbiology, College of Life Science and Technology, Huazhong Agricultural University, Wuhan 430070, PR China.
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Sathishkumar K, Sathiyaraj S, Parthipan P, Akhil A, Murugan K, Rajasekar A. Electrochemical decolorization of methyl red by RuO 2-IrO 2-TiO 2 electrode and biodegradation with Pseudomonas stutzeri MN1 and Acinetobacter baumannii MN3: An integrated approach. Chemosphere 2017; 183:204-211. [PMID: 28549326 DOI: 10.1016/j.chemosphere.2017.05.087] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.7] [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: 02/11/2017] [Revised: 05/12/2017] [Accepted: 05/13/2017] [Indexed: 06/07/2023]
Abstract
Textile effluent consists of enormous quantities of toxic dyes, which are being discharged into natural aqueous system and thus contaminate the water quality. Hence it is important to develop an eco-friendly and cost effective technology to treat the dyes contaminated wastewater. In this research, an integrated approach of electrochemical oxidation (EO) and biodegradation process (BP) was studied of methyl red (MR) dye. In EO, RuO2-IrO2-TiO2 is used as anode and titanium mesh electrode as cathode. This was followed by BP of the treated EO effluent. Various parameters viz., pH (5-10), sodium chloride concentrations (NaCl) (1-5 g L-1) and current density (10-30 mA cm2) were optimized. The results of the EO showed 99.96% of MR decolorization within 10 min at pH of 5, NaCl of 2 g L-1 and current density of 30 mA cm2. The EO treated MR was further treated by BP Pseudomonas stutzeri MN1, Acinetobacter baumannii MN3 and mixed consortia of MN1 and MN3. The out of three treatments, the results of mixed consortium BP showed 90% removal of COD at the end of 24 h. The phytotoxic evaluation using Vigna radiata seeds confirmed the toxicity of untreated MR solution, whereas, 100% germination was observed in treated (biodegraded) MR solution. Overall these results evidenced that MR dye was completely decolorized and mineralized by EO and BP within 10 min and 24 h respectively. Hence, this integrated approach can be used as an effective degradation method to treat dyes in the textile industry.
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Affiliation(s)
- Kuppusamy Sathishkumar
- Environmental Molecular Microbiology Research Laboratory, Department of Biotechnology, Thiruvalluvar University, Vellore, 632 115, India.
| | - Sivaji Sathiyaraj
- Environmental Molecular Microbiology Research Laboratory, Department of Biotechnology, Thiruvalluvar University, Vellore, 632 115, India
| | - Punniyakotti Parthipan
- Environmental Molecular Microbiology Research Laboratory, Department of Biotechnology, Thiruvalluvar University, Vellore, 632 115, India
| | - Agrawal Akhil
- Department of Microbiology, Central University of Rajasthan, Rajasthan, 305 817, India
| | - Kadarkarai Murugan
- Division of Entomology, Department of Zoology, School of Life Sciences, Bharathiar University, Coimbatore, 641 046, India; Thiruvalluvar University, Serkkadu, Vellore, 632 115, Tamilnadu, India
| | - Aruliah Rajasekar
- Environmental Molecular Microbiology Research Laboratory, Department of Biotechnology, Thiruvalluvar University, Vellore, 632 115, India.
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Fan Y, Tao W, Huang H, Li S. Characterization of a novel bioemulsifier from Pseudomonas stutzeri. World J Microbiol Biotechnol 2017; 33:161. [PMID: 28755169 DOI: 10.1007/s11274-017-2326-2] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.3] [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: 04/17/2017] [Accepted: 07/25/2017] [Indexed: 11/25/2022]
Abstract
This study describes a novel and efficient alasan-like bioemulsifier produced by Pseudomonas stutzeri NJtech 11-1, which was isolated from the Shengli Oilfield. The strain was found to produce a new and interesting emulsion stabilizer. The crude bioemulsifier showed super stability with 50% salinity and broad pH 3-10. The emulsion index (EI24) was increased to 100% after heating from 45 to 95 °C and the emulsion could be stable for at least 30 days. The yield of Ps-bioemulsifier (pure bioemulsifier) was 0.68 ± 0.05 mg mL-1. The Ps-bioemulsifier was composed of carbohydrates (80 ± 2.6%) and proteins (9.5 ± 0.5%). A low concentration (0.2 mg mL-1) of the Ps-bioemulsifier was obtained maximum emulsifying activity at pH 7.1 and its emulsifying activity strengthened by suitable salinity. Furthermore, Ps-bioemulsifier could also emulsify cyclohexane, hexadecane, kerosene, xylene hydrocarbons efficiently. Therefore, the Ps-bioemulsifier showed emulsifying characteristics which make it a good candidate for potential applications in bioremediation and microbial enhanced oil recovery.
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Affiliation(s)
- Yanqiu Fan
- College of Biotechnology and Pharmaceutical Engineering, Nanjing Tech University, No. 5 Xinmofan Road, Nanjing, 210009, China
| | - Weiyi Tao
- College of Biotechnology and Pharmaceutical Engineering, Nanjing Tech University, No. 5 Xinmofan Road, Nanjing, 210009, China
| | - He Huang
- School of Pharmaceutical Sciences, Nanjing Tech University, Nanjing, China
- Jiangsu National Synergetic Innovation Center for Advanced Materials (SICAM), Nanjing Tech University, Nanjing, China
| | - Shuang Li
- College of Biotechnology and Pharmaceutical Engineering, Nanjing Tech University, No. 5 Xinmofan Road, Nanjing, 210009, China.
- Jiangsu National Synergetic Innovation Center for Advanced Materials (SICAM), Nanjing Tech University, Nanjing, China.
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Gui M, Chen Q, Ni J. Effect of sulfamethoxazole on aerobic denitrification by strain Pseudomonas stutzeri PCN-1. Bioresour Technol 2017; 235:325-331. [PMID: 28376383 DOI: 10.1016/j.biortech.2017.03.131] [Citation(s) in RCA: 48] [Impact Index Per Article: 6.9] [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: 01/16/2017] [Revised: 03/19/2017] [Accepted: 03/22/2017] [Indexed: 06/07/2023]
Abstract
Sulfamethoxazole (SMX), as a common sulfonamide antibiotic, was reported to affect conventional anaerobic denitrification. This study presented effects of SMX on aerobic denitrification by an aerobic denitrifier strain Pseudomonas stutzeri PCN-1. Results demonstrated serious inhibition of N2O reduction as SMX reached 4μg/L, leading to higher N2O emission ratio (251-fold). Increase of SMX (∼8μg/L) would induce highest nitrite accumulation (95.3mg/L) without reduction, and severe inhibition of nitrate reduction resulted in lower nitrate removal rate (0.15mg/L/h) as SMX reached 20μg/L. Furthermore, corresponding inhibition of SMX on denitrifying genes expression (nosZ>nirS>cnorB>napA) was found with a time-lapse expression between nosZ and cnorB. Meanwhile, the decline in electron transport activity and active microbial biomass of strain PCN-1 was revealed. The insight into mechanism of SMX influence on aerobic denitrifier is of particular significance to upgrade nitrogen removal process in antibiotics-containing wastewater treatment plant.
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Affiliation(s)
- Mengyao Gui
- Department of Environmental Engineering, Peking University, Key Laboratory of Water and Sediment Sciences, Ministry of Education, Beijing 100871, China
| | - Qian Chen
- Department of Environmental Engineering, Peking University, Key Laboratory of Water and Sediment Sciences, Ministry of Education, Beijing 100871, China
| | - Jinren Ni
- Department of Environmental Engineering, Peking University, Key Laboratory of Water and Sediment Sciences, Ministry of Education, Beijing 100871, China.
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29
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Rajora N, Kaushik S, Jyoti A, Kothari SL. Rapid synthesis of silver nanoparticles by Pseudomonas stutzeri isolated from textile soil under optimised conditions and evaluation of their antimicrobial and cytotoxicity properties. IET Nanobiotechnol 2016; 10:367-373. [PMID: 27906136 PMCID: PMC8676139 DOI: 10.1049/iet-nbt.2015.0107] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.0] [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: 08/13/2015] [Revised: 01/27/2016] [Accepted: 03/12/2016] [Indexed: 11/15/2023] Open
Abstract
Present study utilised textile soil isolated bacterium Pseudomonas stutzeri to synthesise extracellular silver nanoparticles (AgNPs) under optimised conditions. The synthesised AgNPs were characterised using ultraviolet-visible spectroscopy, Fourier transform infrared spectroscopy (FTIR) and transmission electron microscopy (TEM). Optimisation showed AgNPs synthesis within 8 h using 2mM Ag nitrate at pH9, temperature 80°C and maximum absorbance toward 400 nm. TEM analysis revealed spherical shape AgNPs and reduction in size upto 8 nm was observed under optimised conditions. FTIR spectra confirmed presence of proteins bound to AgNPs act as reducing agent. AgNPs showed strong antibacterial activity against multi-drug resistant (MDR) Escherichia coli and Klebsiella pneumoniae as demonstrated by disc diffusion and colony forming unit assays. Zone of inhibition increased with increasing concentration of AgNPs with maximum of 19 mm against E. coli and 17 mm against K. pneumoniae at concentration of 2 μg/disc. Furthermore, AgNPs did not show any cytotoxic effects on human epithelial cells as demonstrated by 3-(4,5-dimethylthiazol-2-yl)-2,5-diphenyl tetrazolium bromide assay even at 2 μg/ml concentration of AgNPs. The results of the present study suggest that AgNPs can be synthesised rapidly under optimised conditions and show strong antimicrobial property against MDR pathogens without having toxicity effect on human epithelial cells.
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Affiliation(s)
- Nishant Rajora
- AMITY Institute of Biotechnology, AMITY University Rajasthan, Jaipur 302006, India
| | - Sanket Kaushik
- AMITY Institute of Biotechnology, AMITY University Rajasthan, Jaipur 302006, India
| | - Anupam Jyoti
- AMITY Institute of Biotechnology, AMITY University Rajasthan, Jaipur 302006, India.
| | - Shanker L Kothari
- AMITY Institute of Biotechnology, AMITY University Rajasthan, Jaipur 302006, India
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30
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Zhang L, Trncik C, Andrade SLA, Einsle O. The flavinyl transferase ApbE of Pseudomonas stutzeri matures the NosR protein required for nitrous oxide reduction. Biochim Biophys Acta Bioenerg 2016; 1858:95-102. [PMID: 27864152 DOI: 10.1016/j.bbabio.2016.11.008] [Citation(s) in RCA: 31] [Impact Index Per Article: 3.9] [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: 08/17/2016] [Revised: 11/09/2016] [Accepted: 11/11/2016] [Indexed: 12/15/2022]
Abstract
The copper-containing enzyme nitrous oxide reductase (N2OR) catalyzes the transformation of nitrous oxide (N2O) to dinitrogen (N2) in microbial denitrification. Several accessory factors are essential for assembling the two copper sites CuA and CuZ, and for maintaining the activity. In particular, the deletion of either the transmembrane iron-sulfur flavoprotein NosR or the periplasmic protein NosX, a member of the ApbE family, abolishes N2O respiration. Here we demonstrate through biochemical and structural studies that the ApbE protein from Pseudomonas stutzeri, where the nosX gene is absent, is a monomeric FAD-binding protein that can serve as the flavin donor for NosR maturation via covalent flavinylation of a threonine residue. The flavin transfer reaction proceeds both in vivo and in vitro to generate post-translationally modified NosR with covalently bound FMN. Only FAD can act as substrate and the reaction requires a divalent cation, preferably Mg2+ that was also present in the crystal structure. In addition, the reaction is species-specific to a certain extent.
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Affiliation(s)
- Lin Zhang
- Institute for Biochemistry, Albert-Ludwigs-Universität Freiburg, 79104 Freiburg im Breisgau, Germany
| | - Christian Trncik
- Institute for Biochemistry, Albert-Ludwigs-Universität Freiburg, 79104 Freiburg im Breisgau, Germany
| | - Susana L A Andrade
- Institute for Biochemistry, Albert-Ludwigs-Universität Freiburg, 79104 Freiburg im Breisgau, Germany; BIOSS Centre for Biological Signalling Studies, Schänzlestrasse 1, 79104 Freiburg im Breisgau, Germany
| | - Oliver Einsle
- Institute for Biochemistry, Albert-Ludwigs-Universität Freiburg, 79104 Freiburg im Breisgau, Germany; BIOSS Centre for Biological Signalling Studies, Schänzlestrasse 1, 79104 Freiburg im Breisgau, Germany.
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31
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Lidbury IDEA, Murphy ARJ, Scanlan DJ, Bending GD, Jones AME, Moore JD, Goodall A, Hammond JP, Wellington EMH. Comparative genomic, proteomic and exoproteomic analyses of three Pseudomonas strains reveals novel insights into the phosphorus scavenging capabilities of soil bacteria. Environ Microbiol 2016; 18:3535-3549. [PMID: 27233093 PMCID: PMC5082522 DOI: 10.1111/1462-2920.13390] [Citation(s) in RCA: 40] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Bacteria that inhabit the rhizosphere of agricultural crops can have a beneficial effect on crop growth. One such mechanism is the microbial-driven solubilization and remineralization of complex forms of phosphorus (P). It is known that bacteria secrete various phosphatases in response to low P conditions. However, our understanding of their global proteomic response to P stress is limited. Here, exoproteomic analysis of Pseudomonas putida BIRD-1 (BIRD-1), Pseudomonas fluorescens SBW25 and Pseudomonas stutzeri DSM4166 was performed in unison with whole-cell proteomic analysis of BIRD-1 grown under phosphate (Pi) replete and Pi deplete conditions. Comparative exoproteomics revealed marked heterogeneity in the exoproteomes of each Pseudomonas strain in response to Pi depletion. In addition to well-characterized members of the PHO regulon such as alkaline phosphatases, several proteins, previously not associated with the response to Pi depletion, were also identified. These included putative nucleases, phosphotriesterases, putative phosphonate transporters and outer membrane proteins. Moreover, in BIRD-1, mutagenesis of the master regulator, phoBR, led us to confirm the addition of several novel PHO-dependent proteins. Our data expands knowledge of the Pseudomonas PHO regulon, including species that are frequently used as bioinoculants, opening up the potential for more efficient and complete use of soil complexed P.
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Affiliation(s)
- Ian D E A Lidbury
- School of Life Sciences, University of Warwick, Gibbet Hill Road, Coventry, West Midlands, CV4 7AL, UK.
| | - Andrew R J Murphy
- School of Life Sciences, University of Warwick, Gibbet Hill Road, Coventry, West Midlands, CV4 7AL, UK
| | - David J Scanlan
- School of Life Sciences, University of Warwick, Gibbet Hill Road, Coventry, West Midlands, CV4 7AL, UK
| | - Gary D Bending
- School of Life Sciences, University of Warwick, Gibbet Hill Road, Coventry, West Midlands, CV4 7AL, UK
| | - Alexandra M E Jones
- School of Life Sciences, University of Warwick, Gibbet Hill Road, Coventry, West Midlands, CV4 7AL, UK
| | - Jonathan D Moore
- The Genome Analysis Centre, Norwich Research Park, Norwich, NR4 7UH, UK
| | - Andrew Goodall
- School of Agriculture, Policy, and Development, University of Reading, Earley Gate, Whiteknights, Reading, RG6 6AR, UK
| | - John P Hammond
- School of Agriculture, Policy, and Development, University of Reading, Earley Gate, Whiteknights, Reading, RG6 6AR, UK
- Southern Cross Plant Science, Southern Cross University, Lismore, NSW 2480, Australia
| | - Elizabeth M H Wellington
- School of Life Sciences, University of Warwick, Gibbet Hill Road, Coventry, West Midlands, CV4 7AL, UK
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32
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Black A, Hsu PCL, Hamonts KE, Clough TJ, Condron LM. Influence of copper on expression of nirS, norB and nosZ and the transcription and activity of NIR, NOR and N2 OR in the denitrifying soil bacteria Pseudomonas stutzeri. Microb Biotechnol 2016; 9:381-8. [PMID: 26935976 PMCID: PMC4835574 DOI: 10.1111/1751-7915.12352] [Citation(s) in RCA: 41] [Impact Index Per Article: 5.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/27/2014] [Accepted: 01/24/2016] [Indexed: 11/27/2022] Open
Abstract
Reduction of the potent greenhouse gas nitrous oxide (N(2)O) occurs in soil environments by the action of denitrifying bacteria possessing nitrous oxide reductase (N(2)OR), a dimeric copper (Cu)-dependent enzyme producing environmentally benign dinitrogen (N(2)). We examined the effects of increasing Cu concentrations on the transcription and activity of nitrite reductase (NIR), nitric oxide reductase (NOR) and N2 OR in Pseudomonas stutzeri grown anaerobically in solution over a 10-day period. Gas samples were taken on a daily basis and after 6 days, bacterial RNA was recovered to determine the expression of nirS, norB and nosZ encoding NIR, NOR and N(2)OR respectively. Results revealed that 0.05 mM Cu caused maximum conversion of N(2)O to N(2) via bacterial reduction of N(2)O. As soluble Cu generally makes up less than 0.001% of total soil Cu, extrapolation of 0.05 mg l(-l) soluble Cu would require soils to have a total concentration of Cu in the range of, 150-200 μg g(-1) to maximize the proportion of N(2)O reduced to N(2). Given that many intensively farmed agricultural soils are deficient in Cu in terms of plant nutrition, providing a sufficient concentration of biologically accessible Cu could provide a potentially useful microbial-based strategy of reducing agricultural N(2)O emissions.
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Affiliation(s)
- Amanda Black
- Bio Protection Research Centre, Lincoln University, PO Box 85084, Lincoln, Christchurch, 7647, New Zealand
| | - Pei-Chun L Hsu
- Bio Protection Research Centre, Lincoln University, PO Box 85084, Lincoln, Christchurch, 7647, New Zealand
| | - Kelly E Hamonts
- Bio Protection Research Centre, Lincoln University, PO Box 85084, Lincoln, Christchurch, 7647, New Zealand
- Hawkesbury Institute for the Environment, University of Western Sydney, Locked Bag 1797, Penrith, NSW, 2751, Australia
| | - Tim J Clough
- Faculty of Agriculture and Life Sciences, Lincoln University, PO Box 85084, Lincoln, Christchurch, 7647, New Zealand
| | - Leo M Condron
- Faculty of Agriculture and Life Sciences, Lincoln University, PO Box 85084, Lincoln, Christchurch, 7647, New Zealand
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Zhao F, Zhou JD, Ma F, Shi RJ, Han SQ, Zhang J, Zhang Y. Simultaneous inhibition of sulfate-reducing bacteria, removal of H2S and production of rhamnolipid by recombinant Pseudomonas stutzeri Rhl: Applications for microbial enhanced oil recovery. Bioresour Technol 2016; 207:24-30. [PMID: 26868152 DOI: 10.1016/j.biortech.2016.01.126] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.9] [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: 01/06/2016] [Revised: 01/29/2016] [Accepted: 01/30/2016] [Indexed: 06/05/2023]
Abstract
Sulfate-reducing bacteria (SRB) are widely existed in oil production system, and its H2S product inhibits rhamnolipid producing bacteria. In-situ production of rhamnolipid is promising for microbial enhanced oil recovery. Inhibition of SRB, removal of H2S and production of rhamnolipid by recombinant Pseudomonas stutzeri Rhl were investigated. Strain Rhl can simultaneously remove S(2-) (>92%) and produce rhamnolipid (>136mg/l) under S(2-) stress below 33.3mg/l. Rhl reduced the SRB numbers from 10(9) to 10(5)cells/ml, and the production of H2S was delayed and decreased to below 2mg/l. Rhl also produced rhamnolipid and removed S(2-) under laboratory simulated oil reservoir conditions. High-throughput sequencing data demonstrated that addition of strain Rhl significantly changed the original microbial communities of oilfield production water and decreased the species and abundance of SRB. Bioaugmentation of strain Rhl in oilfield is promising for simultaneous control of SRB, removal of S(2-) and enhance oil recovery.
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Affiliation(s)
- Feng Zhao
- Key Laboratory of Pollution Ecology and Environmental Engineering, Institute of Applied Ecology, Chinese Academy of Sciences, Shenyang, Liaoning Province 110016, China; State Key Laboratory of Urban Water Resource and Environment, School of Municipal and Environmental Engineering, Harbin Institute of Technology, Harbin 150090, China
| | - Ji-Dong Zhou
- Key Laboratory of Pollution Ecology and Environmental Engineering, Institute of Applied Ecology, Chinese Academy of Sciences, Shenyang, Liaoning Province 110016, China
| | - Fang Ma
- State Key Laboratory of Urban Water Resource and Environment, School of Municipal and Environmental Engineering, Harbin Institute of Technology, Harbin 150090, China
| | - Rong-Jiu Shi
- Key Laboratory of Pollution Ecology and Environmental Engineering, Institute of Applied Ecology, Chinese Academy of Sciences, Shenyang, Liaoning Province 110016, China
| | - Si-Qin Han
- Key Laboratory of Pollution Ecology and Environmental Engineering, Institute of Applied Ecology, Chinese Academy of Sciences, Shenyang, Liaoning Province 110016, China
| | - Jie Zhang
- State Key Laboratory of Urban Water Resource and Environment, School of Municipal and Environmental Engineering, Harbin Institute of Technology, Harbin 150090, China
| | - Ying Zhang
- Key Laboratory of Pollution Ecology and Environmental Engineering, Institute of Applied Ecology, Chinese Academy of Sciences, Shenyang, Liaoning Province 110016, China.
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Li D, Li B, Wang Q, Hou N, Li C, Cheng X. Toxicity of TiO₂ nanoparticle to denitrifying strain CFY1 and the impact on microbial community structures in activated sludge. Chemosphere 2016; 144:1334-1341. [PMID: 26479452 DOI: 10.1016/j.chemosphere.2015.10.002] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.8] [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: 07/07/2015] [Revised: 09/23/2015] [Accepted: 10/01/2015] [Indexed: 06/05/2023]
Abstract
The antibacterial activity of titanium dioxide nanoparticles (TiO2 NPs) is well described, but little is known of their impact on specific microbial functions such as denitrification, nor on microbial community structure. In this study, a denitrifier (named as Pseudomonas stutzeri CFY1), which was isolated from the activated sludge and could remove up to 111.68 mg/L of NO3(-)-N under aerobic conditions, was utilized to evaluate the influences of TiO2 NPs on its nitrogen removal ability and associated gene expression under aerobic conditions. The variations of the bacterial diversity of activated sludge were also observed. The results showed that antibacterial activity increased with increasing concentrations of TiO2 NPs. Increased production of reactive oxygen species was responsible for TiO2 NPs toxicity. An up-regulation of denitrification genes was observed with increasing concentrations of TiO2 NPs under aerobic conditions. Accordingly, denitrification by P. stutzeri was accelerated when the concentration of TiO2 NPs was increased to 50 mg/L. However, the denitrification of CFY1 was inhibited at low concentrations of TiO2 NPs (5-25 mg/L), indicating that assimilatory and dissimilatory denitrification were synchronized in P. stutzeri CFY1; the latter process plays a major role in denitrification. Further study of the community using 454 pyrosequencing showed that after 7 days of exposure to 50 mg/L TiO2 NPs, the microbial composition of the activated sludge was significantly different and had a lower diversity compared to the controls.
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Affiliation(s)
- Dapeng Li
- College of Resources and Environment, Northeast Agricultural University, Harbin 150030, China
| | - Bin Li
- Department of Radiology, Peking Union Medical College Hospital, Chinese Academy of Medical Sciences & Peking Union Medical College, Beijing 100730, China
| | - Qiaoruo Wang
- College of Resources and Environment, Northeast Agricultural University, Harbin 150030, China
| | - Ning Hou
- College of Resources and Environment, Northeast Agricultural University, Harbin 150030, China.
| | - Chunyan Li
- College of Resources and Environment, Northeast Agricultural University, Harbin 150030, China
| | - Xiaosong Cheng
- College of First Clinical Medicine, Harbin Medical University, Harbin 150001, China
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Álvarez MS, Rodríguez A, Sanromán MÁ, Deive FJ. Simultaneous biotreatment of Polycyclic Aromatic Hydrocarbons and dyes in a one-step bioreaction by an acclimated Pseudomonas strain. Bioresour Technol 2015; 198:181-188. [PMID: 26386421 DOI: 10.1016/j.biortech.2015.08.125] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [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: 07/31/2015] [Revised: 08/26/2015] [Accepted: 08/27/2015] [Indexed: 06/05/2023]
Abstract
A Pseudomonas stutzeri strain acclimated to the presence of neoteric contaminants has been proposed for simultaneously remediating an effluent polluted with Polycyclic Aromatic Hydrocarbons and a diazo dye. The pollutants chemical nature imposed a strict control of both the medium composition and the operating conditions. pH, temperature and agitation rates of 7.0, 37.5 and 146 rpm, respectively, led to optimum levels of contaminant removal (higher than 60%) after RSM optimization. The validity of these conditions was checked at flask and bioreactor scale and the kinetics of the biotreatment was elucidated. The simulation of this one-step process applied at larger scale for the remediation of a 200,000 m(3)/year-effluent from a leather factory was compared with a conventional two-steps option. Great reductions in treatment times and in investment and manufacturing costs were concluded, proving the promising potential of the proposed process.
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Affiliation(s)
- María S Álvarez
- Department of Chemical Engineering, University of Vigo, 36310 Vigo, Spain
| | - Ana Rodríguez
- Department of Chemical Engineering, University of Vigo, 36310 Vigo, Spain
| | | | - Francisco J Deive
- Department of Chemical Engineering, University of Vigo, 36310 Vigo, Spain.
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Singh R, Yoon H, Sanford RA, Katz L, Fouke BW, Werth CJ. Metabolism-Induced CaCO3 Biomineralization During Reactive Transport in a Micromodel: Implications for Porosity Alteration. Environ Sci Technol 2015; 49:12094-12104. [PMID: 26348257 DOI: 10.1021/acs.est.5b00152] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/05/2023]
Abstract
The ability of Pseudomonas stutzeri strain DCP-Ps1 to drive CaCO3 biomineralization has been investigated in a microfluidic flowcell (i.e., micromodel) that simulates subsurface porous media. Results indicate that CaCO3 precipitation occurs during NO3(-) reduction with a maximum saturation index (SIcalcite) of ∼1.56, but not when NO3(-) was removed, inactive biomass remained, and pH and alkalinity were adjusted to SIcalcite ∼ 1.56. CaCO3 precipitation was promoted by metabolically active cultures of strain DCP-Ps1, which at similar values of SIcalcite, have a more negative surface charge than inactive strain DCP-Ps1. A two-stage NO3(-) reduction (NO3(-) → NO2(-) → N2) pore-scale reactive transport model was used to evaluate denitrification kinetics, which was observed in the micromodel as upper (NO3(-) reduction) and lower (NO2(-) reduction) horizontal zones of biomass growth with CaCO3 precipitation exclusively in the lower zone. Model results are consistent with two biomass growth regions and indicate that precipitation occurred in the lower zone because the largest increase in pH and alkalinity is associated with NO2(-) reduction. CaCO3 precipitates typically occupied the entire vertical depth of pores and impacted porosity, permeability, and flow. This study provides a framework for incorporating microbial activity in biogeochemistry models, which often base biomineralization only on SI (caused by biotic or abiotic reactions) and, thereby, underpredict the extent of this complex process. These results have wide-ranging implications for understanding reactive transport in relevance to groundwater remediation, CO2 sequestration, and enhanced oil recovery.
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Affiliation(s)
| | - Hongkyu Yoon
- Geoscience Research and Applications, Sandia National Laboratories , Albuquerque, New Mexico 87185, United States
| | | | - Lynn Katz
- Civil, Architectural and Environmental Engineering, University of Texas at Austin , Austin, Texas 78712, United States
| | | | - Charles J Werth
- Civil, Architectural and Environmental Engineering, University of Texas at Austin , Austin, Texas 78712, United States
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Zhu S, Zheng M, Li C, Gui M, Chen Q, Ni J. Special role of corn flour as an ideal carbon source for aerobic denitrification with minimized nitrous oxide emission. Bioresour Technol 2015; 186:44-51. [PMID: 25802047 DOI: 10.1016/j.biortech.2015.03.046] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.8] [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: 01/15/2015] [Revised: 03/03/2015] [Accepted: 03/07/2015] [Indexed: 06/04/2023]
Abstract
Much effort has been made for reducing nitrous oxide (N2O) emission in wastewater treatment processes. This paper presents an interesting way to minimize N2O in aerobic denitrification by strain Pseudomonas stutzeri PCN-1 with help of corn flour as cheaper additional carbon source. Experimental results showed that maximal N2O accumulation by strain PCN-1 was only 0.02% of removed nitrogen if corn flour was used as sole carbon source, which was significantly reduced by 52.07-99.81% comparing with others such as succinate, glucose, acetate and citrate. Sustained release of reducing sugar from starch and continuous expression of nosZ coding for N2O reductase contributed to the special role of corn flour as the ideal carbon source for strain PCN-1. Further experiments in sequencing batch reactors (SBRs) demonstrated similarly efficient nitrogen removal with much less N2O emission due to synergy of the novel strain and activated sludge, which was then confirmed by quantitative PCR analysis.
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Affiliation(s)
- Shuangyue Zhu
- Shenzhen Key Laboratory for Heavy Metal Pollution Control and Reutilization, School of Environment and Energy, Peking University Shenzhen Graduate School, Shenzhen 518055, China
| | - Maosheng Zheng
- Department of Environmental Engineering, Peking University, The Key Laboratory of Water and Sediment Sciences, Ministry of Education, Beijing 100871, China
| | - Can Li
- Department of Environmental Engineering, Peking University, The Key Laboratory of Water and Sediment Sciences, Ministry of Education, Beijing 100871, China
| | - Mengyao Gui
- Department of Environmental Engineering, Peking University, The Key Laboratory of Water and Sediment Sciences, Ministry of Education, Beijing 100871, China
| | - Qian Chen
- Department of Environmental Engineering, Peking University, The Key Laboratory of Water and Sediment Sciences, Ministry of Education, Beijing 100871, China
| | - Jinren Ni
- Department of Environmental Engineering, Peking University, The Key Laboratory of Water and Sediment Sciences, Ministry of Education, Beijing 100871, China.
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Li C, Yang J, Wang X, Wang E, Li B, He R, Yuan H. Removal of nitrogen by heterotrophic nitrification-aerobic denitrification of a phosphate accumulating bacterium Pseudomonas stutzeri YG-24. Bioresour Technol 2015; 182:18-25. [PMID: 25668754 DOI: 10.1016/j.biortech.2015.01.100] [Citation(s) in RCA: 152] [Impact Index Per Article: 16.9] [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: 11/28/2014] [Revised: 01/18/2015] [Accepted: 01/23/2015] [Indexed: 06/04/2023]
Abstract
Phosphate accumulating bacterium Pseudomonas stutzeri YG-24 exhibited efficient heterotrophic nitrification and aerobic denitrification ability. Single factor experiments showed that both heterotrophic nitrification and aerobic denitrification occurred with sodium citrate as carbon source and lower C/N ratio of 8. High average NH4(+)-N, NO2(-)-N and NO3(-)-N removal rates of 8.75, 7.51 and 7.73 mg L(-1)h(-1) were achieved. The application of strain YG-24 in wastewater samples resulted in TN, NH4(+)-N, NO2(-)-N, NO3(-)-N and P removal efficiencies of 85.28%, 88.13%, 86.15%, 70.83% and 51.21%. Sequencing and quantitative amplification by real-time PCR of napA, nirS and ppk showed that nitrogen removal pathway of strain YG-24 was achieved through heterotrophic ammonium nitrification coupled with fast nitrite denitrification (NH4(+)-N to NO2(-)-N and then to gaseous nitrogen) directly. These results demonstrated the strain as a suitable candidate to simultaneously remove both nitrogen and phosphate in wastewater treatment.
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Affiliation(s)
- Chune Li
- State Key Laboratories for Agrobiotechnology, College of Biological Sciences, China Agricultural University, Beijing, People's Republic of China
| | - Jinshui Yang
- State Key Laboratories for Agrobiotechnology, College of Biological Sciences, China Agricultural University, Beijing, People's Republic of China
| | - Xin Wang
- State Key Laboratories for Agrobiotechnology, College of Biological Sciences, China Agricultural University, Beijing, People's Republic of China
| | - Entao Wang
- Departamento de Microbiología, Escuela Nacional de Ciencias Biológicas, Instituto Politécnico Nacional, Mexico, DF, Mexico
| | - Baozhen Li
- State Key Laboratories for Agrobiotechnology, College of Biological Sciences, China Agricultural University, Beijing, People's Republic of China
| | - Ruoxue He
- State Key Laboratories for Agrobiotechnology, College of Biological Sciences, China Agricultural University, Beijing, People's Republic of China
| | - Hongli Yuan
- State Key Laboratories for Agrobiotechnology, College of Biological Sciences, China Agricultural University, Beijing, People's Republic of China.
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Soda S, Hasegawa A, Kuroda M, Hanada A, Yamashita M, Ike M. Selenium recovery from kiln powder of cement manufacturing by chemical leaching and bioreduction. Water Sci Technol 2015; 72:1294-1300. [PMID: 26465298 DOI: 10.2166/wst.2015.339] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/05/2023]
Abstract
A novel process by using chemical leaching followed by bacterial reductive precipitation was proposed for selenium recovery from kiln powder as a byproduct of cement manufacturing. The kiln powder at a slurry concentration of 10 w/v% with 0.25 M Na2CO3 at 28°C produced wastewater containing about 30 mg-Se/L selenium. The wastewater was diluted four-fold and adjusted to pH 8.0 as preconditioning for bioreduction. A bacterial strain Pseudomonas stutzeri NT-I, capable of reducing selenate and selenite into insoluble elemental selenium, could recover about 90% selenium from the preconditioned wastewater containing selenium of 5 mg-Se/L when supplemented with lactate or glycerol. The selenium concentrations in the treated wastewater were low around the regulated effluent concentration of 0.1 mg-Se/L in Japan.
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Affiliation(s)
- S Soda
- Graduate School of Engineering, Osaka University, 2-1 Yamadaoka, Suita, Osaka 565-0871, Japan E-mail:
| | - A Hasegawa
- Graduate School of Engineering, Osaka University, 2-1 Yamadaoka, Suita, Osaka 565-0871, Japan E-mail:
| | - M Kuroda
- Graduate School of Engineering, Osaka University, 2-1 Yamadaoka, Suita, Osaka 565-0871, Japan E-mail:
| | - A Hanada
- Research and Development Center, Taiheiyo Cement Corporation, 2-4-2 Osaku, Sakura, Chiba 285-8655, Japan
| | - M Yamashita
- Faculty of Engineering, Shibaura Institute of Technology, 3-7-5 Toyosu, Koto-ku, Tokyo 135-8548, Japan
| | - M Ike
- Graduate School of Engineering, Osaka University, 2-1 Yamadaoka, Suita, Osaka 565-0871, Japan E-mail:
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Kumari B, Rajput S, Gaur P, Singh SN, Singh DP. Biodegradation of pyrene and phenanthrene by bacterial consortium and evaluation of role of surfactant. Cell Mol Biol (Noisy-le-grand) 2014; 60:22-28. [PMID: 25535708] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/13/2014] [Accepted: 07/28/2014] [Indexed: 06/04/2023]
Abstract
High molecular weight poly aromatic hydrocarbons (HMW PAHs) are well known for their hydrophobicity and they get strongly adsorbed onto the soil particles. Generally, surfactants facilitate the biodegradation of PAH by enhancing their solubility and desorption of hydrophobic compounds from soil particles. To investigate the role of synthetic surfactant in biodegradation of PAHs, two bacterial strains BP10 and P2 were incubated in soil spiked with pyrene and phenantherene (100 μg g-1of soil each) in isolation and in combination with/without Tween 80. After 14 days of incubation, pyrene and phenantherene were degraded by a combination of BP10 and P2 to the extent of 98% and 99%, respectively. Addition of tween 80 reduced the degradation of pyrene and phenantherene by 35 and 10%, respectively. Biosurfactant produced by selected strains i.e. BP10 and P2 could enhance desorption of pyrene (100 μg g-1of soil) by about 27% and 12%, respectively. However, desorption activity was relatively higher (32 and 29%, respectively) in case of phenanthrene (100 μg g-1of soil) from the spiked soil. Present study showed that in spite of additional chemical surfactant, bioaugmentation of highly petroleum hydrocarbon degrading bacterial combination was very effective in boosting the bioremediation of PAHs- contaminated sites.
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Affiliation(s)
- B Kumari
- Babasaheb Bhimrao Ambedkar University School of Environmental Science Lucknow India
| | - S Rajput
- CSIR—NBRI Plant Ecology and Environmental Science Lucknow India
| | - P Gaur
- CSIR—NBRI Plant Ecology and Environmental Science Lucknow India
| | - S N Singh
- CSIR—NBRI Plant Ecology and Environmental Science Lucknow India
| | - D P Singh
- Babasaheb Bhimrao Ambedkar University School of Environmental Science Lucknow India dpsingh_lko@yahoo.com
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Han Y, Zhang W, Lu W, Zhou Z, Zhuang Z, Li M. Co-immobilization of Pseudomonas stutzeri YHA-13 and Alcaligenes sp. ZGED-12 with polyvinyl alcohol-alginate for removal of nitrogen and phosphorus from synthetic wastewater. Environ Technol 2014; 35:2813-2820. [PMID: 25176485 DOI: 10.1080/09593330.2014.923516] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/03/2023]
Abstract
Nitrogen (N) and phosphorus (P) are the two main factors causing water eutrophication. Immobilized micro-organisms have been widely studied in N and P removal. However, the effects of various immobilizing conditions on the removal efficiency of N and P using immobilized micro-organism beads (IMOBs) remain unclear. Polyvinyl alcohol (PVA) and alginate, as the two frequently immobilizing-used matrixes, were used for co-immobilizing Pseudomonas stutzeri YHA-13 and Alcaligenes sp. ZGED-12. PVA, alginate and CaCl₂contents, immobilization time and different wet biomass ratios of P. stutzeri to Alcaligenes sp. were conducted to elucidate their roles in and influences on the removal efficiency of N and P from synthetic wastewater. The application potential of IMOBs was estimated as well. Results showed that IMOBs prepared by cross-link of 4% PVA and 2-3% alginate with 5% CaCl₂and saturated boric acid solution for 10-15 min are the best ones in removal of N and P. Though IMOBs containing P. stutzeri and/or Alcaligenes sp. were capable of removal of the two nutrients, the highest removal efficiency was observed when the wet biomass ratio of P. stutzeri to Alcaligenes sp. was adjusted to 2:2. In addition, the IMOBs were of good ability to remove chemical oxygen demand (COD), NO(3)(-), NO(2)(-), NH(4)(+)- N, total nitrogen (TN) and total phosphorus (TP) from artificial wastewater. Of which, micro-organisms immobilized in matrixes were mainly responsible for NO(3)(-) and TP removal. Therefore, P. stutzeri YHA-13 and Alcaligenes sp. ZGED-12 are reliable bioresources to remove N and P from wastewater.
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Affiliation(s)
- Yonghe Han
- a College of Life Sciences , Fujian Normal University , Fuzhou , People's Republic of China
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Zheng M, He D, Ma T, Chen Q, Liu S, Ahmad M, Gui M, Ni J. Reducing NO and N₂O emission during aerobic denitrification by newly isolated Pseudomonas stutzeri PCN-1. Bioresour Technol 2014; 162:80-88. [PMID: 24747385 DOI: 10.1016/j.biortech.2014.03.125] [Citation(s) in RCA: 78] [Impact Index Per Article: 7.8] [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: 01/07/2014] [Revised: 03/21/2014] [Accepted: 03/23/2014] [Indexed: 06/03/2023]
Abstract
As two obligatory intermediates of denitrification, both NO and N2O had harmful environmental and biological impacts. An aerobic denitrifying bacterial strain PCN-1 was newly isolated and identified as Pseudomonas stutzeri, which was capable of high efficient nitrogen removal under aerobic condition with maximal NO and N2O accumulation as low as 0.003% and 0.33% of removed NO3(-)-N, respectively. Further experiment taking nitrite as denitrifying substrate indicated similar low NO and N2O emission of 0.006% and 0.29% of reduced NO2(-)-N, respectively. Reverse transcription-polymerase chain reaction (RT-PCR) analysis revealed that the coordinate expression of denitrification gene nirS (for cytochrome cd1 nitrite reductase), cnorB (for NO reductase) and nosZ (for N2O reductase) was the fundamental reason of low NO and N2O accumulation. Activated sludge system bioaugmented by strain PCN-1 demonstrated a significant reduction of NO and N2O emission from wastewater during aerobic denitrification, implied great potential of PCN-1 in practical applications.
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Affiliation(s)
- Maosheng Zheng
- Department of Environmental Engineering, Peking University, Key Laboratory of Water and Sediment Sciences, Ministry of Education, Beijing 100871, China
| | - Da He
- Department of Environmental Engineering, Peking University, Key Laboratory of Water and Sediment Sciences, Ministry of Education, Beijing 100871, China
| | - Tao Ma
- Department of Environmental Engineering, Peking University, Key Laboratory of Water and Sediment Sciences, Ministry of Education, Beijing 100871, China
| | - Qian Chen
- Department of Environmental Engineering, Peking University, Key Laboratory of Water and Sediment Sciences, Ministry of Education, Beijing 100871, China
| | - Sitong Liu
- Department of Environmental Engineering, Peking University, Key Laboratory of Water and Sediment Sciences, Ministry of Education, Beijing 100871, China
| | - Muhammad Ahmad
- Department of Environmental Engineering, Peking University, Key Laboratory of Water and Sediment Sciences, Ministry of Education, Beijing 100871, China
| | - Mengyao Gui
- Department of Environmental Engineering, Peking University, Key Laboratory of Water and Sediment Sciences, Ministry of Education, Beijing 100871, China
| | - Jinren Ni
- Department of Environmental Engineering, Peking University, Key Laboratory of Water and Sediment Sciences, Ministry of Education, Beijing 100871, China.
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Ji B, Wang H, Yang K. Nitrate and COD removal in an upflow biofilter under an aerobic atmosphere. Bioresour Technol 2014; 158:156-160. [PMID: 24594672 DOI: 10.1016/j.biortech.2014.02.025] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.7] [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: 01/06/2014] [Revised: 02/06/2014] [Accepted: 02/08/2014] [Indexed: 06/03/2023]
Abstract
A continuous-upflow submerged biofilter packed with ceramsite was constructed for nitrate removal under an aerobic atmosphere. Pseudomonas stutzeri X31, an aerobic denitrifier isolate, was added to the bioreactor as an inoculum. The influent NO3(-)-N concentrations were 63.0-73.8 mg L(-1). The best results were achieved when dissolved oxygen level was 4.6 mg L(-1) and C/N ratio was 4.5. The maximum removal efficiencies of carbon oxygen demand (COD) and NO3(-)-N were 94.04% and 98.48%, respectively at 30°C, when the hydraulic load was 0.75 m h(-1). The top section of the bioreactor possessed less biofilm but higher COD and NO3(-)-N removal rates than the bottom section. Polymerase chain reaction (PCR)-denaturing gradient gel electrophoresis (DGGE) technique combined with electron microscopic examination indicated P. stutzeri X31 and Paracoccus versutus were the most dominant bacteria. Amoeba sp., Vorticella sp., Philodina sp., and Stephanodiscus sp. were also found in the bioreactor.
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Affiliation(s)
- Bin Ji
- School of Civil Engineering, Wuhan University, Wuhan 430072, China
| | - Hongyu Wang
- School of Civil Engineering, Wuhan University, Wuhan 430072, China
| | - Kai Yang
- School of Civil Engineering, Wuhan University, Wuhan 430072, China.
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Hove-Jensen B, Zechel DL, Jochimsen B. Utilization of glyphosate as phosphate source: biochemistry and genetics of bacterial carbon-phosphorus lyase. Microbiol Mol Biol Rev 2014; 78:176-97. [PMID: 24600043 PMCID: PMC3957732 DOI: 10.1128/mmbr.00040-13] [Citation(s) in RCA: 117] [Impact Index Per Article: 11.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022] Open
Abstract
After several decades of use of glyphosate, the active ingredient in weed killers such as Roundup, in fields, forests, and gardens, the biochemical pathway of transformation of glyphosate phosphorus to a useful phosphorus source for microorganisms has been disclosed. Glyphosate is a member of a large group of chemicals, phosphonic acids or phosphonates, which are characterized by a carbon-phosphorus bond. This is in contrast to the general phosphorus compounds utilized and metabolized by microorganisms. Here phosphorus is found as phosphoric acid or phosphate ion, phosphoric acid esters, or phosphoric acid anhydrides. The latter compounds contain phosphorus that is bound only to oxygen. Hydrolytic, oxidative, and radical-based mechanisms for carbon-phosphorus bond cleavage have been described. This review deals with the radical-based mechanism employed by the carbon-phosphorus lyase of the carbon-phosphorus lyase pathway, which involves reactions for activation of phosphonate, carbon-phosphorus bond cleavage, and further chemical transformation before a useful phosphate ion is generated in a series of seven or eight enzyme-catalyzed reactions. The phn genes, encoding the enzymes for this pathway, are widespread among bacterial species. The processes are described with emphasis on glyphosate as a substrate. Additionally, the catabolism of glyphosate is intimately connected with that of aminomethylphosphonate, which is also treated in this review. Results of physiological and genetic analyses are combined with those of bioinformatics analyses.
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Guo L, Chen Q, Fang F, Hu Z, Wu J, Miao A, Xiao L, Chen X, Yang L. Application potential of a newly isolated indigenous aerobic denitrifier for nitrate and ammonium removal of eutrophic lake water. Bioresour Technol 2013; 142:45-51. [PMID: 23735789 DOI: 10.1016/j.biortech.2013.05.021] [Citation(s) in RCA: 27] [Impact Index Per Article: 2.5] [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: 03/16/2013] [Revised: 05/04/2013] [Accepted: 05/06/2013] [Indexed: 06/02/2023]
Abstract
The aim of this work was to evaluate the utilization potential of a newly isolated indigenous aerobic denitrifier, Pseudomonas stutzeri strain T1, for nitrogen removal from the eutrophic Lake Taihu in China. The strain was capable of conducting heterotrophic nitrification-aerobic denitrification and had both excellent nitrate and ammonium removal without nitrite build-up. The characteristics of P. stutzeri strain T1 were studied under different cultural conditions. Furthermore, under the optimized cultivation conditions, strain T1 was added into the water samples from Lake Taihu, the ammonium and nitrate removal rates of the strain reached to 60% and 75%, respectively. Via adding this strain, the water qualities of the sample ameliorated from Grade V to Grade II. Thus, the strain T1 should be an useful biological tool to remediate eutrophic lakes and do not meet acclimation problems.
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Affiliation(s)
- Liyun Guo
- State Key Laboratory of Pollution Control and Resource Reuse, School of the Environment, Nanjing University, Nanjing 210023, China
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Yang Y, Wang J, Xiu Z, Alvarez PJJ. Impacts of silver nanoparticles on cellular and transcriptional activity of nitrogen-cycling bacteria. Environ Toxicol Chem 2013; 32:1488-1494. [PMID: 23554086 DOI: 10.1002/etc.2230] [Citation(s) in RCA: 32] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/03/2013] [Revised: 02/19/2013] [Accepted: 03/18/2013] [Indexed: 06/02/2023]
Abstract
The widespread use of silver nanoparticles (AgNPs) raises the potential for environmental releases that could impact microbial ecosystem services. In the present study, the authors address how the AgNPs and Ag(+) that they release may impact nitrogen-cycling bacteria. The authors studied the cellular and transcriptional response of the denitrifier Pseudomonas stutzeri, the nitrogen fixer Azotobacter vinelandii, and the nitrifier Nitrosomonas europaea exposed to 35 nm (carbon-coated) AgNPs or to Ag(+) (added as AgNO3 ). Based on minimum inhibitory concentrations (MICs), Ag(+) was 20 times to 48 times more toxic to the tested strains than AgNPs (including Ag(+) released during exposure). Exposure to sublethal concentrations of AgNPs or Ag(+) (representing 10% of the respective MIC for AgNO3 ) resulted in no significant effect on the expression of the denitrifying genes narG, napB, nirH, and norB in P. stutzeri or the nitrogen-fixing genes nifD, nifH, vnfD, and anfD in A. vinelandii, whereas nitrifying genes (amoA1 and amoC2) in N. europaea were upregulated (2.1- to 3.3-fold). This stimulatory effect disappeared at higher silver concentrations (60% of the Ag(+) MIC), and toxicity was exerted at concentrations higher than 60% of the Ag(+) MIC. The MIC for N. europaea was 8 times to 24 times lower than for the other strains, indicating higher susceptibility to AgNPs. This was corroborated by the lower half-lethal concentration for N. europaea (87 µg/L) compared with P. stutzeri (124 µg/L) and A. vinelandii (>250 µg/L) when cells were exposed with Ag(+) for 24 h in 1 mM bicarbonate buffer. This suggests that ammonia oxidation would be the most vulnerable nitrogen-cycling process in wastewater treatment plants receiving AgNPs and in agricultural soils amended with biosolids that concentrate them.
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Affiliation(s)
- Yu Yang
- Department of Civil and Environmental Engineering, Rice University, Houston, Texas, USA
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Kagami T, Narita T, Kuroda M, Notaguchi E, Yamashita M, Sei K, Soda S, Ike M. Effective selenium volatilization under aerobic conditions and recovery from the aqueous phase by Pseudomonas stutzeri NT-I. Water Res 2013; 47:1361-8. [PMID: 23270669 DOI: 10.1016/j.watres.2012.12.001] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/20/2012] [Revised: 10/28/2012] [Accepted: 12/03/2012] [Indexed: 05/07/2023]
Abstract
Selenium is an important rare metal and its recovery from waste and wastewater is necessary for its sustainable utilization. Microbial selenium volatilization is suitable for selenium recovery from industrial wastewater because volatile selenium can be recovered in recyclable forms free from other chemicals. We found that Pseudomonas stutzeri NT-I can aerobically transform selenate, selenite, and biogenic elemental selenium into dimethyldiselenide as well as dimethylselenide; these were temporarily accumulated in the aqueous phase and then transferred into the gaseous phase. The rate of selenium volatilization using strain NT-I ranged 6.5-7.6 μmol/L/h in flask experiments and was much higher than the rates reported previously for other microbes. The selenium volatilization rate accelerated to 14 μmol/L/h in a jar fermenter. Furthermore, 82% of the selenium volatilized using strain NT-I was recovered with few impurities within 48 h in a simple gas trap with nitric acid, demonstrating that strain NT-I is a promising biocatalyst for selenium recovery through biovolatilization from the aqueous phase.
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Affiliation(s)
- Tsubasa Kagami
- Division of Sustainable Energy and Environmental Engineering, Graduate School of Engineering, Osaka University, 2-1 Yamadaoka, Suita, Osaka 565-0871, Japan
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Deb S, Ahmed SF, Basu M. Metal accumulation in cell wall: a possible mechanism of cadmium resistance by Pseudomonas stutzeri. Bull Environ Contam Toxicol 2013; 90:323-8. [PMID: 23275974 DOI: 10.1007/s00128-012-0933-z] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/21/2011] [Accepted: 12/14/2012] [Indexed: 05/10/2023]
Abstract
A heavy metal resistant strain, Pseudomonas stutzeri (MTCC 101) has been investigated for its cadmium tolerance properties along with its antibiotic resistance. The organism could tolerate cadmium up to 1,200 μg/mL with LD50 value 700 μg/mL. The gene(s) involved in such high resistance appear(s) to be induced in the presence of the metal. Increasing concentrations of cadmium successively prolonged the lag phase of growth with delayed attainment of the stationary phase. Transmission electron microscope and scanning electron microscope-energy dispersive analysis of X-ray spectroscope analysis showed cadmium adsorption on the bacterial surface with morphological distortion. Atomic absorption spectrometric study corroborated this data, showing highest cadmium accumulation in the cell wall fraction of the bacteria. Additionally, the cell wall fraction showed synthesis of new proteins when grown under metal stress.
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Affiliation(s)
- S Deb
- Signal Transduction in Cancer and Stem Cell Laboratory, Division of Cancer Biology and Inflammatory Disorder, Council of Scientific and Industrial Research-Indian Institute of Chemical Biology (CSIR-IICB), 4 Raja S. C. Mullick Road, Jadavpur, Kolkata, 700 032, India.
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Kaczorek E, Sałek K, Guzik U, Jesionowski T, Cybulski Z. Biodegradation of alkyl derivatives of aromatic hydrocarbons and cell surface properties of a strain of Pseudomonas stutzeri. Chemosphere 2013; 90:471-8. [PMID: 22925424 DOI: 10.1016/j.chemosphere.2012.07.065] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/28/2012] [Revised: 07/23/2012] [Accepted: 07/27/2012] [Indexed: 05/15/2023]
Abstract
Pseudomonas stutzeri strain 9 was isolated from petroleum-contaminated soil. The main purpose of this study was to investigate how the long-term contact of this strain with diesel oil influences its surface and biodegradation properties. The experiments showed that the tested strain was able to degrade aromatic alkyl derivatives (butylbenzene, sec-butylbenzene, tert-butylbenzene and isobutylbenzene) and that the storage conditions had an influence on the cell surface properties. Also greater agglomeration of the cells was observed in the scanning electron microscope (SEM) micrographs and confirmed in particle size distribution results. The results also indicated that the addition of rhamnolipids to the hydrocarbons led to modification of the surface properties of P. stutzeri strain 9, which could be observed in the zeta potential and hydrophobicity values.
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Affiliation(s)
- Ewa Kaczorek
- Institute of Chemical Technology and Engineering, Poznan University of Technology, M. Sklodowskiej-Curie 2, 60-965 Poznan, Poland.
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Ozturk S, Kaya T, Aslim B, Tan S. Removal and reduction of chromium by Pseudomonas spp. and their correlation to rhamnolipid production. J Hazard Mater 2012; 231-232:64-69. [PMID: 22790393 DOI: 10.1016/j.jhazmat.2012.06.038] [Citation(s) in RCA: 41] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/25/2011] [Revised: 06/18/2012] [Accepted: 06/19/2012] [Indexed: 06/01/2023]
Abstract
Chromium removal and its association with rhamnolipid production in Pseudomonas spp. were investigated. Three Pseudomonas spp. isolates (P. aeruginosa 78, P. aeruginosa 99, and P. stutzeri T3) were investigated with regard to their exposure to 10mg/L for chromium removal. P. aeruginosa 99 removed 16% and 20% more chromium than P. stutzeri T3 and P. aeruginosa 78 respectively. The reduction of Cr(VI) to Cr(III) by all the three isolates is more or less similar. P. aeruginosa 99, which removed higher chromium, also produced higher rhamnolipid (165±5 mg/mL). P. aeruginosa 78, which removed lower chromium, also produced lower rhamnolipid (126±3 mg/mL). Rhamnolipid production by P. aeruginosa 78 and P. aeruginosa 99 was increased in its exposure to 10mg/L chromium. In the present study, results showed that rhamnolipid might play a role in chromium removal by three Pseudomonas spp. isolates.
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Affiliation(s)
- Sahlan Ozturk
- Nevsehir University, Faculty of Science and Arts, Department of Biology, Nevsehir, Turkey.
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