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Liu Z, Dang K, Li C, Gao J, Wang H, Gao Y, Zhao B, Fan P, Qian A. Isolation and identification of a novel bacterium, Pseudomonas sp. ZyL-01, involved in the biodegradation of CL-20. AMB Express 2020; 10:196. [PMID: 33128640 PMCID: PMC7603440 DOI: 10.1186/s13568-020-01136-x] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/26/2020] [Accepted: 10/21/2020] [Indexed: 11/21/2022] Open
Abstract
Hexanitrohexaazaisowurtzitane (CL-20) is a compound with a polycyclic cage and an N-nitro group that has been shown to play an unfavorable role in environmental fate, biosafety, and physical health. The aim of this study was to isolate the microbial community and to identify a single microbial strain that can degrade CL-20 with desirable efficiency. Metagenomic sequencing methods were performed to investigate the dynamic changes in the composition of the community diversity. The most varied genus among the microbial community was Pseudomonas, which increased from 1.46% to 44.63% during the period of incubation (MC0-MC4). Furthermore, the new strain was isolated and identified from the activated sludge by bacterial morphological and 16s rRNA sequencing analyses. The CL-20 concentrations decreased by 75.21 μg/mL and 74.02 μg/mL in 48 h by MC4 and Pseudomonas sp. ZyL-01, respectively. Moreover, ZyL-01 could decompose 98% CL-20 of the real effluent in 14 day's incubation with the glucose as carbon source. Finally, a draft genome sequence was obtained to predict possible degrading enzymes involved in the biodegradation of CL-20. Specifically, 330 genes that are involved in energy production and conversion were annotated by Gene Ontology functional enrichment analysis, and some of these candidates may encode enzymes that are responsible for CL-20 degradation. In summary, our studies indicate that microbes might be a valuable biological resource for the treatment of environmental contamination caused by CL-20 and that Pseudomonas sp. ZyL-01 might be a promising candidate for eradicating CL-20 to achieve a more biosafe environment and improve public health.
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Affiliation(s)
- Zhiyong Liu
- Lab for Bone Metabolism, Xi'an Key Laboratory of Special Medicine and Health Engineering, Key Lab for Space Biosciences and Biotechnology, Research Center for Special Medicine and Health Systems Engineering, NPU-UAB Joint Laboratory for Bone Metabolism, School of Life Sciences, Northwestern Polytechnical University, Xi'an, 710072, Shaanxi, China
- Toxicology Research Center, Institute of Ordnance Industry Hygiene, Xi'an, 710065, Shaanxi, China
| | - Kai Dang
- Lab for Bone Metabolism, Xi'an Key Laboratory of Special Medicine and Health Engineering, Key Lab for Space Biosciences and Biotechnology, Research Center for Special Medicine and Health Systems Engineering, NPU-UAB Joint Laboratory for Bone Metabolism, School of Life Sciences, Northwestern Polytechnical University, Xi'an, 710072, Shaanxi, China
| | - Cunzhi Li
- Toxicology Research Center, Institute of Ordnance Industry Hygiene, Xi'an, 710065, Shaanxi, China
| | - Junhong Gao
- Toxicology Research Center, Institute of Ordnance Industry Hygiene, Xi'an, 710065, Shaanxi, China
| | - Hong Wang
- Toxicology Research Center, Institute of Ordnance Industry Hygiene, Xi'an, 710065, Shaanxi, China
| | - Yongchao Gao
- Toxicology Research Center, Institute of Ordnance Industry Hygiene, Xi'an, 710065, Shaanxi, China
| | - Bin Zhao
- Toxicology Research Center, Institute of Ordnance Industry Hygiene, Xi'an, 710065, Shaanxi, China
| | - Peng Fan
- Toxicology Research Center, Institute of Ordnance Industry Hygiene, Xi'an, 710065, Shaanxi, China
| | - Airong Qian
- Lab for Bone Metabolism, Xi'an Key Laboratory of Special Medicine and Health Engineering, Key Lab for Space Biosciences and Biotechnology, Research Center for Special Medicine and Health Systems Engineering, NPU-UAB Joint Laboratory for Bone Metabolism, School of Life Sciences, Northwestern Polytechnical University, Xi'an, 710072, Shaanxi, China.
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Woźniak-Karczewska M, Čvančarová M, Chrzanowski Ł, Kolvenbach B, Corvini PFX, Cichocka D. Isolation of two Ochrobactrum sp. strains capable of degrading the nootropic drug—Piracetam. N Biotechnol 2018; 43:37-43. [DOI: 10.1016/j.nbt.2017.07.006] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/04/2016] [Revised: 07/11/2017] [Accepted: 07/12/2017] [Indexed: 10/19/2022]
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Sivakumar D, Vembu S, Chandrakumari S, Manikandan H, Venkatesan V, Gopalakrishnan M. One-Pot Synthesis of Hexaacetylhexaazaisowurtzitane (HAIW) a Precursor of 2,4,6,8,10,12-Hexanitro-2,4,6,8,10,12-hexaazaisowurtzitane (HNIW-CL−20). ChemistrySelect 2017. [DOI: 10.1002/slct.201602033] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Affiliation(s)
- Dhanavel Sivakumar
- Department of Chemistry; Annamalai University; Annamalainagar 608 002 India
| | - Sandhirakasu Vembu
- Department of Chemistry; Annamalai University; Annamalainagar 608 002 India
| | | | | | - Vaidyanathan Venkatesan
- Research Innovation Centre; Defence Research Development Organisation; Chennai 600 113 India
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Khan MI, Lee J, Yoo K, Kim S, Park J. Improved TNT detoxification by starch addition in a nitrogen-fixing Methylophilus-dominant aerobic microbial consortium. JOURNAL OF HAZARDOUS MATERIALS 2015; 300:873-881. [PMID: 26342802 DOI: 10.1016/j.jhazmat.2015.08.032] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/01/2015] [Revised: 07/24/2015] [Accepted: 08/17/2015] [Indexed: 06/05/2023]
Abstract
In this study, a novel aerobic microbial consortium for the complete detoxification of 2,4,6-trinitrotoluene (TNT) was developed using starch as a slow-releasing carbon source under nitrogen-fixing conditions. Aerobic TNT biodegradation coupled with microbial growth was effectively stimulated by the co-addition of starch and TNT under nitrogen-fixing conditions. The addition of starch with TNT led to TNT mineralization via ring cleavage without accumulation of any toxic by-products, indicating improved TNT detoxification by the co-addition of starch and TNT. Pyrosequencing targeting the bacterial 16S rRNA gene suggested that Methylophilus and Pseudoxanthomonas population were significantly stimulated by the co-addition of starch and TNT and that the Methylophilus population became predominant in the consortium. Together with our previous study regarding starch-stimulated RDX (hexahydro-1,3,5-trinitro-1,3,5-triazine) degradation (Khan et al., J. Hazard. Mater. 287 (2015) 243-251), this work suggests that the co-addition of starch with a target explosive is an effective way to stimulate aerobic explosive degradation under nitrogen-fixing conditions for enhancing explosive detoxification.
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Affiliation(s)
- Muhammad Imran Khan
- Department of Civil and Environmental Engineering, College of Engineering, Yonsei University, Seoul 120-749, Republic of Korea; Department of Agronomy, University of Agriculture, Faisalabad 38040, Pakistan
| | - Jaejin Lee
- Department of Civil and Environmental Engineering, College of Engineering, Yonsei University, Seoul 120-749, Republic of Korea
| | - Keunje Yoo
- Department of Civil and Environmental Engineering, College of Engineering, Yonsei University, Seoul 120-749, Republic of Korea
| | - Seonghoon Kim
- Department of Civil and Environmental Engineering, College of Engineering, Yonsei University, Seoul 120-749, Republic of Korea
| | - Joonhong Park
- Department of Civil and Environmental Engineering, College of Engineering, Yonsei University, Seoul 120-749, Republic of Korea.
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Khan MI, Yang J, Yoo B, Park J. Improved RDX detoxification with starch addition using a novel nitrogen-fixing aerobic microbial consortium from soil contaminated with explosives. JOURNAL OF HAZARDOUS MATERIALS 2015; 287:243-251. [PMID: 25661171 DOI: 10.1016/j.jhazmat.2015.01.058] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/10/2014] [Revised: 01/13/2015] [Accepted: 01/26/2015] [Indexed: 06/04/2023]
Abstract
In this work, we developed and characterized a novel nitrogen-fixing aerobic microbial consortium for the complete detoxification of hexahydro-1,3,5-trinitro-1,3,5-triazine (RDX). Aerobic RDX biodegradation coupled with microbial growth and nitrogen fixation activity were effectively stimulated by the co-addition of starch and RDX under nitrogen limiting conditions. In the starch-stimulated nitrogen-fixing RDX degradative consortium, the RDX degradation activity was correlated with the xplA and nifH gene copy numbers, suggesting the involvement of nitrogen fixing populations in RDX biodegradation. Formate, nitrite, nitrate, and ammonia were detected as aerobic RDX degradation intermediates without the accumulation of any nitroso-derivatives or NDAB (4-nitro-2,4-diazabutanal), indicating nearly complete mineralization. Pyrosequencing targeting the bacterial 16S rRNA genes revealed that the Rhizobium, Rhizobacter and Terrimonas population increased as the RDX degradation activity increased, suggesting their involvement in the degradation process. These findings imply that the nitrogen-fixing aerobic RDX degrading consortium is a valuable microbial resource for improving the detoxification of RDX-contaminated soil or groundwater, especially when combined with rhizoremediation.
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Affiliation(s)
- Muhammad Imran Khan
- School of Civil and Environmental Engineering, College of Engineering, Yonsei University, Seoul 120-749, Republic of Korea; Department of Agronomy, University of Agriculture, Faisalabad 38040, Pakistan
| | - Jihoon Yang
- School of Civil and Environmental Engineering, College of Engineering, Yonsei University, Seoul 120-749, Republic of Korea
| | - Byungun Yoo
- School of Civil and Environmental Engineering, College of Engineering, Yonsei University, Seoul 120-749, Republic of Korea
| | - Joonhong Park
- School of Civil and Environmental Engineering, College of Engineering, Yonsei University, Seoul 120-749, Republic of Korea.
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Abstract
Explosives are synthesized globally mainly for military munitions. Nitrate esters, such as GTN and PETN, nitroaromatics like TNP and TNT and nitramines with RDX, HMX and CL20, are the main class of explosives used. Their use has resulted in severe contamination of environment and strategies are now being developed to clean these substances in an economical and eco-friendly manner. The incredible versatility inherited in microbes has rendered these explosives as a part of the biogeochemical cycle. Several microbes catalyze mineralization and/or nonspecific transformation of explosive waste either by aerobic or anaerobic processes. It is likely that ongoing genetic adaptation, with the recruitment of silent sequences into functional catabolic routes and evolution of substrate range by mutations in structural genes, will further enhance the catabolic potential of bacteria toward explosives and ultimately contribute to cleansing the environment of these toxic and recalcitrant chemicals. This review summarizes information on the biodegradation and biotransformation pathways of several important explosives. Isolation, characterization, utilization and manipulation of the major detoxifying enzymes and the molecular basis of degradation are also discussed. This may be useful in developing safer and economic microbiological methods for clean up of soil and water contaminated with such compounds. The necessity of further investigations concerning the microbial metabolism of these substances is also discussed.
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Monteil-Rivera F, Halasz A, Manno D, Kuperman RG, Thiboutot S, Ampleman G, Hawari J. Fate of CL-20 in sandy soils: degradation products as potential markers of natural attenuation. ENVIRONMENTAL POLLUTION (BARKING, ESSEX : 1987) 2009; 157:77-85. [PMID: 18801604 DOI: 10.1016/j.envpol.2008.07.030] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/28/2008] [Revised: 07/24/2008] [Accepted: 07/26/2008] [Indexed: 05/26/2023]
Abstract
Hexanitrohexaazaisowurtzitane (CL-20) is an emerging explosive that may replace the currently used explosives such as RDX and HMX, but little is known about its fate in soil. The present study was conducted to determine degradation products of CL-20 in two sandy soils under abiotic and biotic anaerobic conditions. Biotic degradation was prevalent in the slightly acidic VT soil, which contained a greater organic C content, while the slightly alkaline SAC soil favored hydrolysis. CL-20 degradation was accompanied by the formation of formate, glyoxal, nitrite, ammonium, and nitrous oxide. Biotic degradation of CL-20 occurred through the formation of its denitrohydrogenated derivative (m/z 393 Da) while hydrolysis occurred through the formation of a ring cleavage product (m/z 156 Da) that was tentatively identified as CH(2)=N-C(=N-NO(2))-CH=N-CHO or its isomer N(NO(2))=CH-CH=N-CO-CH=NH. Due to their chemical specificity, these two intermediates may be considered as markers of in situ attenuation of CL-20 in soil.
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Affiliation(s)
- Fanny Monteil-Rivera
- Biotechnology Research Institute, National Research Council of Canada, 6100 Royalmount Avenue, Montréal, Québec, Canada H4P 2R2.
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Paslawski JC, Headley JV, Hill GA, Nemati M. Biodegradation kinetics of trans-4-methyl-1-cyclohexane carboxylic acid. Biodegradation 2008; 20:125-33. [PMID: 18633718 DOI: 10.1007/s10532-008-9206-2] [Citation(s) in RCA: 28] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/21/2008] [Accepted: 07/03/2008] [Indexed: 11/28/2022]
Abstract
Naphthenic acids are a complex mixture of organic compounds which naturally occur in crude oil. Low molecular weight components of the naphthenic acids are known to be toxic in aquatic environments and there is a need to better understand the factors controlling the kinetics of their biodegradation. In this study, a relatively low molecular weight naphthenic acid compound (trans-isomer of 4-methyl-1-cyclohexane carboxylic acid) and a microbial culture developed in our laboratory were used to study the biodegradation of this naphthenic acid and to evaluate the kinetics of the process in batch cultures. The initial concentration of trans-4-methyl-1-cyclohexane carboxylic acid (50-750 mg l(-1)) did not affect the maximum specific growth rate of the bacteria at 23 degrees C (0.52 day(-1)) to the maximum biodegradable concentration (750 mg l(-1)). The maximum yield observed at this temperature and at a neutral pH was 0.21 mg of biomass per milligram of substrate. Batch experiments indicated that biodegradation can be achieved at low temperatures; however, the biodegradation rate at room temperature (23 degrees C) and neutral pH was 5 times faster than that observed at 4 degrees C. Biodegradation at various pH conditions indicated a maximum specific growth rate of 1.69 day(-1) and yield (0.41 mg mg(-1)) at a pH of 10.
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Affiliation(s)
- Janice C Paslawski
- Division of Environmental Engineering, University of Saskatchewan, Saskatoon, Saskatchewan, Canada.
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