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Xie Y, Chen G, May AL, Yan J, Brown LP, Powers JB, Campagna SR, Löffler FE. Pseudomonas sp. Strain 273 Degrades Fluorinated Alkanes. ENVIRONMENTAL SCIENCE & TECHNOLOGY 2020; 54:14994-15003. [PMID: 33190477 DOI: 10.1021/acs.est.0c04029] [Citation(s) in RCA: 18] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/11/2023]
Abstract
Fluorinated organic compounds have emerged as environmental constituents of concern. We demonstrate that the alkane degrader Pseudomonas sp. strain 273 utilizes terminally monofluorinated C7-C10 alkanes and 1,10-difluorodecane (DFD) as the sole carbon and energy sources in the presence of oxygen. Strain 273 degraded 1-fluorodecane (FD) (5.97 ± 0.22 mM, nominal) and DFD (5.62 ± 0.13 mM, nominal) within 7 days of incubation, and 92.7 ± 3.8 and 90.1 ± 1.9% of the theoretical maximum amounts of fluorine were recovered as inorganic fluoride, respectively. With n-decane, strain 273 attained (3.24 ± 0.14) × 107 cells per μmol of carbon consumed, while lower biomass yields of (2.48 ± 0.15) × 107 and (1.62 ± 0.23) × 107 cells were measured with FD or DFD as electron donors, respectively. The organism coupled decanol and decanoate oxidation to denitrification, but the utilization of (fluoro)alkanes was strictly oxygen-dependent, presumably because the initial attack on the terminal carbon requires oxygen. Fluorohexanoate was detected as an intermediate in cultures grown with FD or DFD, suggesting that the initial attack on the fluoroalkanes can occur on the terminal methyl or fluoromethyl groups. The findings indicate that specialized bacteria such as Pseudomonas sp. strain 273 can break carbon-fluorine bonds most likely with oxygenolytic enzyme systems and that terminally monofluorinated alkanes are susceptible to microbial degradation. The findings have implications for the fate of components associated with aqueous film-forming foam (AFFF) mixtures.
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Affiliation(s)
- Yongchao Xie
- Department of Civil and Environmental Engineering, University of Tennessee, Knoxville, Tennessee 37996, United States
- Center for Environmental Biotechnology, University of Tennessee, Knoxville, Tennessee 37996, United States
- Biosciences Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, United States
| | - Gao Chen
- Department of Civil and Environmental Engineering, University of Tennessee, Knoxville, Tennessee 37996, United States
- Center for Environmental Biotechnology, University of Tennessee, Knoxville, Tennessee 37996, United States
| | - Amanda L May
- Center for Environmental Biotechnology, University of Tennessee, Knoxville, Tennessee 37996, United States
| | - Jun Yan
- Key Laboratory of Pollution Ecology and Environmental Engineering, Institute of Applied Ecology, Chinese Academy of Sciences, Shenyang, Liaoning 110016, China
| | - Lindsay P Brown
- Department of Chemistry, University of Tennessee, Knoxville, Tennessee 37996, United States
| | - Joshua B Powers
- Department of Chemistry, University of Tennessee, Knoxville, Tennessee 37996, United States
| | - Shawn R Campagna
- Department of Chemistry, University of Tennessee, Knoxville, Tennessee 37996, United States
- Biological and Small Molecule Mass Spectrometry Core, University of Tennessee, Knoxville, Tennessee 37996, United States
| | - Frank E Löffler
- Department of Civil and Environmental Engineering, University of Tennessee, Knoxville, Tennessee 37996, United States
- Center for Environmental Biotechnology, University of Tennessee, Knoxville, Tennessee 37996, United States
- Biosciences Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, United States
- Department of Microbiology, University of Tennessee, Knoxville, Tennessee 37996, United States
- Department of Biosystems Engineering and Soil Science, University of Tennessee, Knoxville, Tennessee 37996, United States
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Singh R, Ryu J, Kim SW. Microbial consortia including methanotrophs: some benefits of living together. J Microbiol 2019; 57:939-952. [PMID: 31659683 DOI: 10.1007/s12275-019-9328-8] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/01/2019] [Revised: 08/30/2019] [Accepted: 09/25/2019] [Indexed: 01/13/2023]
Abstract
With the progress of biotechnological research and improvements made in bioprocessing with pure cultures, microbial consortia have gained recognition for accomplishing biological processes with improved effectiveness. Microbes are indispensable tool in developing bioprocesses for the production of bioenergy and biochemicals while utilizing renewable resources due to technical, economic and environmental advantages. They communicate with specific cohorts in close proximity to promote metabolic cooperation. Use of positive microbial associations has been recognized widely, especially in food industries and bioremediation of toxic compounds and waste materials. Role of microbial associations in developing sustainable energy sources and substitutes for conventional fuels is highly promising with many commercial prospects. Detoxification of chemical contaminants sourced from domestic, agricultural and industrial wastes has also been achieved through microbial catalysis in pure and co-culture systems. Methanotrophs, the sole biological sink of greenhouse gas methane, catalyze the methane monooxygenasemediated oxidation of methane to methanol, a high energy density liquid and key platform chemical to produce commodity chemical compounds and their derivatives. Constructed microbial consortia have positive effects, such as improved biomass, biocatalytic potential, stability etc. In a methanotroph-heterotroph consortium, non-methanotrophs provide key nutrient factors and alleviate the toxicity from the culture. Non-methanotrophic organisms biologically stimulate the growth and activity of methanotrophs via production of growth stimulators. However, methanotrophs in association with co-cultured microorganisms are in need of further exploration and thorough investigation to study their interaction mode and application with improved effectiveness.
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Affiliation(s)
- Rajendra Singh
- Department of Environmental Engineering, Chosun University, Gwangju, 61452, Republic of Korea
| | - Jaewon Ryu
- Department of Energy Convergence, Chosun University, Gwangju, 61452, Republic of Korea
| | - Si Wouk Kim
- Department of Environmental Engineering, Chosun University, Gwangju, 61452, Republic of Korea. .,Department of Energy Convergence, Chosun University, Gwangju, 61452, Republic of Korea.
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3
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Myung J, Kim M, Pan M, Criddle CS, Tang SKY. Low energy emulsion-based fermentation enabling accelerated methane mass transfer and growth of poly(3-hydroxybutyrate)-accumulating methanotrophs. BIORESOURCE TECHNOLOGY 2016; 207:302-307. [PMID: 26896714 DOI: 10.1016/j.biortech.2016.02.029] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/07/2015] [Revised: 02/01/2016] [Accepted: 02/04/2016] [Indexed: 06/05/2023]
Abstract
Methane is a low-cost feedstock for the production of polyhydroxyalkanoate biopolymers, but methanotroph fermentations are limited by the low solubility of methane in water. To enhance mass transfer of methane to water, vigorous mixing or agitation is typically used, which inevitably increases power demand and operational costs. This work presents a method for accelerating methane mass transfer without agitation by growing methanotrophs in water-in-oil emulsions, where the oil has a higher solubility for methane than water does. In systems without agitation, the growth rate of methanotrophs in emulsions is five to six times that of methanotrophs in the medium-alone incubations. Within seven days, cells within the emulsions accumulate up to 67 times more P3HB than cells in the medium-alone incubations. This is achieved due to the increased interfacial area of the aqueous phase, and accelerated methane diffusion through the oil phase.
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Affiliation(s)
- Jaewook Myung
- Department of Civil and Environmental Engineering, Stanford University, CA, United States
| | - Minkyu Kim
- Department of Mechanical Engineering, Stanford University, CA, United States
| | - Ming Pan
- Department of Materials Science and Engineering, Stanford University, CA, United States
| | - Craig S Criddle
- Department of Civil and Environmental Engineering, Stanford University, CA, United States
| | - Sindy K Y Tang
- Department of Mechanical Engineering, Stanford University, CA, United States.
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Strong PJ, Xie S, Clarke WP. Methane as a resource: can the methanotrophs add value? ENVIRONMENTAL SCIENCE & TECHNOLOGY 2015; 49:4001-18. [PMID: 25723373 DOI: 10.1021/es504242n] [Citation(s) in RCA: 230] [Impact Index Per Article: 25.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/12/2023]
Abstract
Methane is an abundant gas used in energy recovery systems, heating, and transport. Methanotrophs are bacteria capable of using methane as their sole carbon source. Although intensively researched, the myriad of potential biotechnological applications of methanotrophic bacteria has not been comprehensively discussed in a single review. Methanotrophs can generate single-cell protein, biopolymers, components for nanotechnology applications (surface layers), soluble metabolites (methanol, formaldehyde, organic acids, and ectoine), lipids (biodiesel and health supplements), growth media, and vitamin B12 using methane as their carbon source. They may be genetically engineered to produce new compounds such as carotenoids or farnesene. Some enzymes (dehydrogenases, oxidase, and catalase) are valuable products with high conversion efficiencies and can generate methanol or sequester CO2 as formic acid ex vivo. Live cultures can be used for bioremediation, chemical transformation (propene to propylene oxide), wastewater denitrification, as components of biosensors, or possibly for directly generating electricity. This review demonstrates the potential for methanotrophs and their consortia to generate value while using methane as a carbon source. While there are notable challenges using a low solubility gas as a carbon source, the massive methane resource, and the potential cost savings while sequestering a greenhouse gas, keeps interest piqued in these unique bacteria.
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Affiliation(s)
- P J Strong
- Centre for Solid Waste Bioprocessing, School of Civil Engineering, School of Chemical Engineering, The University of Queensland, St. Lucia, Brisbane, Queensland 4072, Australia
| | - S Xie
- Centre for Solid Waste Bioprocessing, School of Civil Engineering, School of Chemical Engineering, The University of Queensland, St. Lucia, Brisbane, Queensland 4072, Australia
| | - W P Clarke
- Centre for Solid Waste Bioprocessing, School of Civil Engineering, School of Chemical Engineering, The University of Queensland, St. Lucia, Brisbane, Queensland 4072, Australia
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Im J, Walshe-Langford GE, Moon JW, Löffler FE. Environmental fate of the next generation refrigerant 2,3,3,3-tetrafluoropropene (HFO-1234yf). ENVIRONMENTAL SCIENCE & TECHNOLOGY 2014; 48:13181-13187. [PMID: 25329364 DOI: 10.1021/es5032147] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/04/2023]
Abstract
The hydrofluoroolefin 2,3,3,3-tetrafluoropropene (HFO-1234yf) has been introduced to replace 1,1,1,2-tetrafluoroethane (HFC-134a) as refrigerant in mobile, including vehicle, air conditioning systems because of its lower global warming potential. HFO-1234yf is volatile at ambient temperatures; however, high production volumes and widespread handling are expected to release this fluorocarbon into terrestrial and aquatic environments, including groundwater. Laboratory experiments explored HFO-1234yf degradation by (i) microbial processes under oxic and anoxic conditions, (ii) abiotic processes mediated by reactive mineral phases and zerovalent iron (Fe(0), ZVI), and (iii) cobalamin-catalyzed biomimetic transformation. These investigations demonstrated that HFO-1234yf was recalcitrant to microbial (co)metabolism and no transformation was observed in incubations with ZVI, makinawite (FeS), sulfate green rust (GR(SO4)), magnetite (Fe(3)O(4)), and manganese oxide (MnO2). Sequential reductive defluorination of HFO-1234yf to 3,3,3-trifluoropropene and 3,3-dichloropropene with concomitant stoichiometric release of fluoride occurred in incubations with reduced cobalamins (e.g., vitamin B12) indicating that biomolecules can transform HFO-1234yf at circumneutral pH and at ambient temperature. Taken together, these findings suggest that HFO-1234yf recalcitrance in aquifers should be expected; however, HFO-1234yf is not inert and a biomolecule may mediate reductive transformation in low redox environments, albeit at low rates.
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Affiliation(s)
- Jeongdae Im
- Center for Environmental Biotechnology, University of Tennessee , Knoxville, Tennessee 37996, United States
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Farahani P, Maeda S, Francisco JS, Lundberg M. Mechanisms for the Breakdown of Halomethanes through Reactions with Ground-State Cyano Radicals. Chemphyschem 2014; 16:181-90. [DOI: 10.1002/cphc.201402601] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/27/2014] [Indexed: 11/07/2022]
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Kutsuna S. Determination of Rate Constants for Aqueous Reactions of HCFC-123 and HCFC-225ca with OH−
Along with Henry's Law Constants of Several HCFCs. INT J CHEM KINET 2013. [DOI: 10.1002/kin.20780] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Affiliation(s)
- Shuzo Kutsuna
- National Institute of Advanced Industrial Science and Technology (AIST); Tsukuba Ibaraki 305 8569 Japan
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Kutsuna S, Hori H, Naganuma M, Shimono A. Solubility and hydrolysis of HCFC-22 (CHF2
Cl): Upward revision of rate constants for aqueous reactions of CHF2
Cl with OH−
at elevated temperature. INT J CHEM KINET 2011. [DOI: 10.1002/kin.20596] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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Scheutz C, Mosbaek H, Kjeldsen P. Attenuation of methane and volatile organic compounds in landfill soil covers. JOURNAL OF ENVIRONMENTAL QUALITY 2004; 33:61-71. [PMID: 14964359 DOI: 10.2134/jeq2004.6100] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/24/2023]
Abstract
The potential for natural attenuation of volatile organic compounds (VOCs) in landfill covers was investigated in soil microcosms incubated with methane and air, simulating the gas composition in landfill soil covers. Soil was sampled at Skellingsted Landfill at a location emitting methane. In total, 26 VOCs were investigated, including chlorinated methanes, ethanes, ethenes, fluorinated hydrocarbons, and aromatic hydrocarbons. The soil showed a high capacity for methane oxidation resulting in very high oxidation rates of between 24 and 112 microg CH4 g(-1) h(-1). All lower chlorinated compounds were shown degradable, and the degradation occurred in parallel with the oxidation of methane. In general, the degradation rates of the chlorinated aliphatics were inversely related to the chlorine to carbon ratios. For example, in batch experiments with chlorinated ethylenes, the highest rates were observed for vinyl chloride (VC) and lowest rates for trichloroethylene (TCE), while tetrachloroethylene (PCE) was not degraded. Maximal oxidation rates for the halogenated aliphatic compounds varied between 0.03 and 1.7 microg g(-1) h(-1). Fully halogenated hydrocarbons (PCE, tetrachloromethane [TeCM], chlorofluorocarbon [CFC]-11, CFC-12, and CFC-113) were not degraded in the presence of methane and oxygen. Aromatic hydrocarbons were rapidly degraded giving high maximal oxidation rates (0.17-1.4 microg g(-1) h(-1)). The capacity for methane oxidation was related to the depth of oxygen penetration. The methane oxidizers were very active in oxidizing methane and the selected trace components down to a depth of 50 cm below the surface. Maximal oxidation activity occurred in a zone between 15 and 20 cm below the surface, as this depth allowed sufficient supply of both methane and oxygen. Mass balance calculations using the maximal oxidation rates obtained demonstrated that landfill soil covers have a significant potential for not only methane oxidation but also cometabolic degradation of selected volatile organics, thereby reducing emissions to the atmosphere.
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Affiliation(s)
- Charlotte Scheutz
- Environment & Resources, Bygningstorvet-Building 115, Technical University of Denmark, DK-2800 Lyngby, Denmark.
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10
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Yvon-Lewis SA. Effect of oceanic uptake on atmospheric lifetimes of selected trace gases. ACTA ACUST UNITED AC 2002. [DOI: 10.1029/2001jd001267] [Citation(s) in RCA: 48] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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11
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Chang WK, Criddle CS. Experimental evaluation of a model for cometabolism: Prediction of simultaneous degradation of trichloroethylene and methane by a methanotrophic mixed culture. Biotechnol Bioeng 1997; 56:492-501. [DOI: 10.1002/(sici)1097-0290(19971205)56:5<492::aid-bit3>3.0.co;2-d] [Citation(s) in RCA: 39] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
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12
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Matheson LJ, Jahnke LL, Oremland RS. Inhibition of Methane Oxidation by Methylococcus capsulatus with Hydrochlorofluorocarbons and Fluorinated Methanes. Appl Environ Microbiol 1997; 63:2952-6. [PMID: 16535662 PMCID: PMC1389217 DOI: 10.1128/aem.63.7.2952-2956.1997] [Citation(s) in RCA: 16] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
Abstract
The inhibition of methane oxidation by cell suspensions of Methylococcus capsulatus (Bath) exposed to hydrochlorofluorocarbon 21 (HCFC-21; difluorochloromethane [CHF(inf2)Cl]), HCFC-22 (fluorodichloromethane [CHFCl(inf2)]), and various fluorinated methanes was investigated. HCFC-21 inhibited methane oxidation to a greater extent than HCFC-22, for both the particulate and soluble methane monooxygenases. Among the fluorinated methanes, both methyl fluoride (CH(inf3)F) and difluoromethane (CH(inf2)F(inf2)) were inhibitory while fluoroform (CHF(inf3)) and carbon tetrafluoride (CF(inf4)) were not. The inhibition of methane oxidation by HCFC-21 and HCFC-22 was irreversible, while that by methyl fluoride was reversible. The HCFCs also proved inhibitory to methanol dehydrogenase, which suggests that they disrupt other aspects of C(inf1) catabolism in addition to methane monooxygenase activity.
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Abstract
Recent field and laboratory studies have evaluated the potential for aerobic co-metabolism of chlorinated solvents. Different co-metabolic substrates and different methods of application have been tried, including growing indigenous microbes in situ, and injecting into the soil subsurface strains grown in subsurface reactors for their co-metabolic potential. There is much potential for using co-metabolism for treating a broad range of chlorinated aliphatic hydrocarbons. Recirculation wells have potential for adding soluble co-metabolic substrates (i.e. phenol and toluene) into contaminated aquifers, while direct addition of gaseous substrates (i.e. methane and propane) into aquifers also holds promise. Aromatic substrates (phenol and toluene) are best used for treatment of chlorinated ethenes, whereas gaseous co-metabolic substrate (methane and propane) are better suited for the treatment of chlorinated methanes and ethanes. Many factors can enhance co-metabolic transformations, such as nutrients and available energy sources.
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Affiliation(s)
- L Semprini
- Department of Civil, Construction, and Environmental Engineering, Oregon State University, Corvallis 97331-2302, USA.
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Oremland RS, Lonergan DJ, Culbertson CW, Lovley DR. Microbial degradation of hydrochlorofluorocarbons (CHCl2F and CHCl2CF3) in soils and sediments. Appl Environ Microbiol 1996; 62:1818-21. [PMID: 8633881 PMCID: PMC167957 DOI: 10.1128/aem.62.5.1818-1821.1996] [Citation(s) in RCA: 23] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/01/2023] Open
Abstract
The ability of microorganisms to degrade trace levels of the hydrochlorofluorocarbons HCFC-21 and HCFC-123 was investigated. Methanotroph-linked oxidation of HCFC-21 was observed in aerobic soils, and anaerobic degradation of HCFC-21 occurred in freshwater and salt marsh sediments. Microbial degradation of HCFC-123 was observed in anoxic freshwater and salt marsh sediments, and the recovery of 1,1,1-trifluoro-2-chloroethane indicated the involvement of reductive dechlorination. No degradation of HCFC-123 was observed in aerobic soils. In some experiments, HCFCs were degraded at low (parts per billion) concentrations, raising the possibility that bacteria in nature remove HCFCs from the atmosphere.
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Affiliation(s)
- R S Oremland
- U.S. Geological Survey, Menlo Park, California 94025, USA.
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