1
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Nguyen DK, Nguyen TP, Li YR, Ohme-Takagi M, Liu ZH, Ly TT, Nguyen VA, Trinh NN, Huang HJ. Comparative study of two indoor microbial volatile pollutants, 2-Methyl-1-butanol and 3-Methyl-1-butanol, on growth and antioxidant system of rice (Oryza sativa) seedlings. ECOTOXICOLOGY AND ENVIRONMENTAL SAFETY 2024; 272:116055. [PMID: 38340597 DOI: 10.1016/j.ecoenv.2024.116055] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/24/2023] [Revised: 01/24/2024] [Accepted: 01/28/2024] [Indexed: 02/12/2024]
Abstract
2-Methyl-1-butanol (2MB) and 3-Methyl-1-butanol (3MB) are microbial volatile organic compounds (VOCs) and found in indoor air. Here, we applied rice as a bioindicator to investigate the effects of these indoor microbial volatile pollutants. A remarkable decrease in germination percentage, shoot and root elongation, as well as lateral root numbers were observed in 3MB. Furthermore, ROS production increased by 2MB and 3MB, suggesting that pentanol isomers could induce cytotoxicity in rice seedlings. The enhancement of peroxidase (POD) and catalase (CAT) activity provided evidence that pentanol isomers activated the enzymatic antioxidant scavenging systems, with a more significant effect observed in 3MB. Furthermore, 3MB induced higher activity levels of glutathione (GSH), oxidized glutathione (GSSG), and the GSH/GSSG ratio in rice compared to the levels induced by 2MB. Additionally, qRT-PCR analysis showed more up-regulation in the expression of glutaredoxins (GRXs), peroxiredoxins (PRXs), thioredoxins (TRXs), and glutathione S-transferases (GSTUs) genes in 3MB. Taking the impacts of pentanol isomers together, the present study suggests that 3MB exhibits more cytotoxic than 2MB, as such has critical effects on germination and the early seedling stage of rice. Our results provide molecular insights into how isomeric indoor microbial volatile pollutants affect plant growth through airborne signals.
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Affiliation(s)
- Diem-Kieu Nguyen
- Department of Life Sciences, National Cheng Kung University, Tainan, Taiwan
| | - Tri-Phuong Nguyen
- Department of Life Sciences, National Cheng Kung University, Tainan, Taiwan
| | - Yi-Rong Li
- Department of Life Sciences, National Cheng Kung University, Tainan, Taiwan
| | - Masaru Ohme-Takagi
- Institute of Tropical Plant Sciences and Microbiology, National Cheng Kung University, Tainan, Taiwan
| | - Zin-Huang Liu
- Graduate Program in Translational Agricultural Sciences, NCKU and Academia Sinica, Taiwan
| | - Thach-Thao Ly
- Graduate Program in Translational Agricultural Sciences, NCKU and Academia Sinica, Taiwan
| | - Van-Anh Nguyen
- Department of Life Sciences, National Cheng Kung University, Tainan, Taiwan; Intellectual Property Office of Vietnam, Thanh Xuan District, Ha Noi, Vietnam
| | - Ngoc-Nam Trinh
- Industrial University of Ho Chi Minh City, Go Vap District, Ho Chi Minh, Vietnam
| | - Hao-Jen Huang
- Department of Life Sciences, National Cheng Kung University, Tainan, Taiwan; Institute of Tropical Plant Sciences and Microbiology, National Cheng Kung University, Tainan, Taiwan; Graduate Program in Translational Agricultural Sciences, NCKU and Academia Sinica, Taiwan.
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Su H, Lin J. Biosynthesis pathways of expanding carbon chains for producing advanced biofuels. BIOTECHNOLOGY FOR BIOFUELS AND BIOPRODUCTS 2023; 16:109. [PMID: 37400889 DOI: 10.1186/s13068-023-02340-0] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Subscribe] [Scholar Register] [Received: 12/01/2022] [Accepted: 05/11/2023] [Indexed: 07/05/2023]
Abstract
Because the thermodynamic property is closer to gasoline, advanced biofuels (C ≥ 6) are appealing for replacing non-renewable fossil fuels using biosynthesis method that has presented a promising approach. Synthesizing advanced biofuels (C ≥ 6), in general, requires the expansion of carbon chains from three carbon atoms to more than six carbon atoms. Despite some specific biosynthesis pathways that have been developed in recent years, adequate summary is still lacking on how to obtain an effective metabolic pathway. Review of biosynthesis pathways for expanding carbon chains will be conducive to selecting, optimizing and discovering novel synthetic route to obtain new advanced biofuels. Herein, we first highlighted challenges on expanding carbon chains, followed by presentation of two biosynthesis strategies and review of three different types of biosynthesis pathways of carbon chain expansion for synthesizing advanced biofuels. Finally, we provided an outlook for the introduction of gene-editing technology in the development of new biosynthesis pathways of carbon chain expansion.
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Affiliation(s)
- Haifeng Su
- Key Laboratory of Degraded and Unused Land Consolidation Engineering, The Ministry of Natural and Resources, Xian, 710075, Shanxi, China
| | - JiaFu Lin
- Antibiotics Research and Re-Evaluation Key Laboratory of Sichuan Province, Sichuan Industrial Institute of Antibiotics, School of Pharmacy, Chengdu University, Chengdu, 610106, China.
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3
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Aissani N, Aissani R, Ghidaoui M, Zouidi F, Sebai H. Valorization of Baker Yeast Industry Waste in Agriculture by Improving Germination and Growth of Barley and Pea. Dose Response 2023; 21:15593258231198974. [PMID: 37667682 PMCID: PMC10475235 DOI: 10.1177/15593258231198974] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/11/2023] [Accepted: 08/17/2023] [Indexed: 09/06/2023] Open
Abstract
Industrial waste still present an environmental danger for the nature and survival of all living beings. Among these toxic products, the focus has been on liquid effluents from the baker's yeast industry that cause real environmental problems mainly due to their pollutant load and the release of unpleasant odors. In order to minimize these hazards and to take advantage of these wastes for the sake of our environment, the present work consists on valorizing effluents from the baker's yeast industry on barley (Hordeum vulgare) and pea (Pisum sativum), two important agricultural products of Tunisian north-west. Results showed that this waste is characterized by its richness in organic matter, and the presence of proteins traces with high chemical and biochemical oxygen demand (COD and BOD5) values. Diluted effluent at a dose of 2.5 mg/g significantly improves germination of both plant seeds by germination index (GI) calculation, to reach a maximum of 190 ± 17% and 150 ± 14% for barley and pea, respectively. In fertigation experiment, the use of a lower dose of .62 mg/g of diluted effluent promotes plant length to reach 52 ± 4 cm and 45 ± 1.4 cm, respectively, for H. vulgare and P. sativum. Gas chromatography coupled to mass spectrometry (GC-MS) analysis after derivatization showed significant enhancement of auxin production in pea treated with .62 mg/g of cream compared to control with a concentration of 10.60 ± .81 and 8.16 ± .43 ng/gFW, respectively. In another experiment, the irrigation of pea plants with furfural, as major compound of cream, promotes length and auxin production to reach 9.89 ± .56 ng/gFW for a furfural dose of .31 mg/g. This leads us to valorize baker's yeast effluent as an environment-friendly natural product in pea and barley agricultural and give insight to its mode of action.
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Affiliation(s)
- Nadhem Aissani
- Laboratory of Functional Physiology and Valorization of Bio resources, High Institute of Biotechnology of Beja, University of Jendouba, Beja, Tunisia
| | - Rania Aissani
- Vitroplant Society, Route el Mahfoura, Manouba, Tunisia
| | | | - Ferjeni Zouidi
- Biology Department, Faculty of Sciences and Arts of Muhayil Asir, King Khaled University, Muhayil Asir, Saudi Arabia
| | - Hichem Sebai
- Laboratory of Functional Physiology and Valorization of Bio resources, High Institute of Biotechnology of Beja, University of Jendouba, Beja, Tunisia
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4
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Ding X, Yang W, Du X, Chen N, Xu Q, Wei M, Zhang C. High-level and -yield production of L-leucine in engineered Escherichia coli by multistep metabolic engineering. Metab Eng 2023; 78:128-136. [PMID: 37286072 DOI: 10.1016/j.ymben.2023.06.003] [Citation(s) in RCA: 5] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/18/2023] [Revised: 05/19/2023] [Accepted: 06/04/2023] [Indexed: 06/09/2023]
Abstract
L-leucine is an essential amino acid widely used in food and pharmaceutical industries. However, the relatively low production efficiency limits its large-scale application. In this study, we rationally developed an efficient L-leucine-producing Escherichia coli strain. Initially, the L-leucine synthesis pathway was enhanced by overexpressing feedback-resistant 2-isopropylmalate synthase and acetohydroxy acid synthase both derived from Corynebacterium glutamicum, along with two other native enzymes. Next, the pyruvate and acetyl-CoA pools were enriched by deleting competitive pathways, employing the nonoxidative glycolysis pathway, and dynamically modulating the citrate synthase activity, which significantly promoted the L-leucine production and yield to 40.69 g/L and 0.30 g/g glucose, respectively. Then, the redox flux was improved by substituting the native NADPH-dependent acetohydroxy acid isomeroreductase, branched chain amino acid transaminase, and glutamate dehydrogenase with their NADH-dependent equivalents. Finally, L-leucine efflux was accelerated by precise overexpression of the exporter and deletion of the transporter. Under fed-batch conditions, the final strain LXH-21 produced 63.29 g/L of L-leucine, with a yield and productivity of 0.37 g/g glucose and 2.64 g/(L h), respectively. To our knowledge, this study achieved the highest production efficiency of L-leucine to date. The strategies presented here will be useful for engineering E. coli strains for producing L-leucine and related products on an industrial scale.
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Affiliation(s)
- Xiaohu Ding
- Key Laboratory of Industrial Fermentation Microbiology, Ministry of Education, Tianjin Key Laboratory of Industrial Microbiology, Tianjin University of Science and Technology, Tianjin, 300457, China; College of Biotechnology, Tianjin University of Science and Technology, Tianjin, 300457, China
| | - Wenjun Yang
- College of Biotechnology, Tianjin University of Science and Technology, Tianjin, 300457, China
| | - Xiaobin Du
- College of Biotechnology, Tianjin University of Science and Technology, Tianjin, 300457, China
| | - Ning Chen
- Key Laboratory of Industrial Fermentation Microbiology, Ministry of Education, Tianjin Key Laboratory of Industrial Microbiology, Tianjin University of Science and Technology, Tianjin, 300457, China; College of Biotechnology, Tianjin University of Science and Technology, Tianjin, 300457, China
| | - Qingyang Xu
- Key Laboratory of Industrial Fermentation Microbiology, Ministry of Education, Tianjin Key Laboratory of Industrial Microbiology, Tianjin University of Science and Technology, Tianjin, 300457, China; College of Biotechnology, Tianjin University of Science and Technology, Tianjin, 300457, China
| | - Minhua Wei
- College of Biotechnology, Tianjin University of Science and Technology, Tianjin, 300457, China.
| | - Chenglin Zhang
- Key Laboratory of Industrial Fermentation Microbiology, Ministry of Education, Tianjin Key Laboratory of Industrial Microbiology, Tianjin University of Science and Technology, Tianjin, 300457, China; College of Biotechnology, Tianjin University of Science and Technology, Tianjin, 300457, China.
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Schultes FPJ, Haarmann M, Tischler D, Mügge C. Primary alcohols as substrates or products in whole-cell biocatalysis: Toxicity for Escherichia coli expression strains. MOLECULAR CATALYSIS 2023. [DOI: 10.1016/j.mcat.2023.112979] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 02/04/2023]
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Monroe MM, Villanueva LG, Briand D. Low-temperature processing of screen-printed piezoelectric KNbO 3 with integration onto biodegradable paper substrates. MICROSYSTEMS & NANOENGINEERING 2023; 9:19. [PMID: 36844941 PMCID: PMC9946825 DOI: 10.1038/s41378-023-00489-0] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 10/03/2022] [Revised: 12/15/2022] [Accepted: 01/15/2023] [Indexed: 06/18/2023]
Abstract
The development of fully solution-processed, biodegradable piezoelectrics is a critical step in the development of green electronics towards the worldwide reduction of harmful electronic waste. However, recent printing processes for piezoelectrics are hindered by the high sintering temperatures required for conventional perovskite fabrication techniques. Thus, a process was developed to manufacture lead-free printed piezoelectric devices at low temperatures to enable integration with eco-friendly substrates and electrodes. A printable ink was developed for screen printing potassium niobate (KNbO3) piezoelectric layers in microns of thickness at a maximum processing temperature of 120 °C with high reproducibility. Characteristic parallel plate capacitor and cantilever devices were designed and manufactured to assess the quality of this ink and evaluate its physical, dielectric, and piezoelectric characteristics; including a comparison of behaviour between conventional silicon and biodegradable paper substrates. The printed layers were 10.7-11.2 μm thick, with acceptable surface roughness values in the range of 0.4-1.1 μm. The relative permittivity of the piezoelectric layer was 29.3. The poling parameters were optimised for the piezoelectric response, with an average longitudinal piezoelectric coefficient for samples printed on paper substrates measured as d 33, eff, paper = 13.57 ± 2.84 pC/N; the largest measured value was 18.37 pC/N on paper substrates. This approach to printable biodegradable piezoelectrics opens the way forward for fully solution-processed green piezoelectric devices.
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Affiliation(s)
- Morgan M. Monroe
- École Polytechnique Fédérale de Lausanne (EPFL), Soft Transducers Laboratory, Institute of Mechanical Engineering, 2000 Neuchâtel, Switzerland
- École Polytechnique Fédérale de Lausanne (EPFL), Advanced NEMS Laboratory, Institute of Mechanical Engineering, 1015 Lausanne, Switzerland
| | - L. Guillermo Villanueva
- École Polytechnique Fédérale de Lausanne (EPFL), Advanced NEMS Laboratory, Institute of Mechanical Engineering, 1015 Lausanne, Switzerland
| | - Danick Briand
- École Polytechnique Fédérale de Lausanne (EPFL), Soft Transducers Laboratory, Institute of Mechanical Engineering, 2000 Neuchâtel, Switzerland
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7
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Thorough Characterization of ETHQB3.5, a QTL Involved in Melon Fruit Climacteric Behavior and Aroma Volatile Composition. Foods 2023; 12:foods12020376. [PMID: 36673468 PMCID: PMC9858179 DOI: 10.3390/foods12020376] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/25/2022] [Revised: 01/03/2023] [Accepted: 01/06/2023] [Indexed: 01/15/2023] Open
Abstract
The effect of the QTL involved in climacteric ripening ETHQB3.5 on the fruit VOC composition was studied using a set of Near-Isogenic Lines (NILs) containing overlapping introgressions from the Korean accession PI 16375 on the chromosome 3 in the climacteric 'Piel de Sapo' (PS) genetic background. ETHQB3.5 was mapped in an interval of 1.24 Mb that contained a NAC transcription factor. NIL fruits also showed differences in VOC composition belonging to acetate esters, non-acetate esters, and sulfur-derived families. Cosegregation of VOC composition (23 out of 48 total QTLs were mapped) and climacteric ripening was observed, suggesting a pleiotropic effect of ETHQB3.5. On the other hand, other VOCs (mainly alkanes, aldehydes, and ketones) showed a pattern of variation independent of ETHQB3.5 effects, indicating the presence of other genes controlling non-climacteric ripening VOCs. Network correlation analysis and hierarchical clustering found groups of highly correlated compounds and confirmed the involvement of the climacteric differences in compound classes and VOC differences. The modification of melon VOCs may be achieved with or without interfering with its physiological behavior, but it is likely that high relative concentrations of some type of ethylene-dependent esters could be achieved in climacteric cultivars.
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8
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Ibrahim SL, Hassen A. Effects of Graded Levels of Mimosa ( Acacia mearnsii) Tannin Purified with Organic Solvents on Gas, Methane, and In Vitro Organic Matter Digestibility of Eragrostis curvula Hay. Animals (Basel) 2022; 12:ani12050562. [PMID: 35268131 PMCID: PMC8908840 DOI: 10.3390/ani12050562] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/03/2021] [Revised: 01/18/2022] [Accepted: 01/20/2022] [Indexed: 11/16/2022] Open
Abstract
The higher contribution of methane (CH4) to global anthropogenic potential is a cause of concern to livestock producers. Mimosa tannin gained recent acceptance as an additive for enteric CH4 mitigation. However, rumen fermentation and digestibility are compromised when large quantities of tannins are supplemented due to the presence of hydrolysable tannin and other non-tannin molecules in mimosa extract, which are toxic to animals. Purification could eliminate the toxins, and thus, reduce the CH4 yield without negative effects on rumen microbial activities and organic matter degradation. The Soxhlet extraction method was used to purify the tannin using organic solvents (ethyl acetate and pentanol). The unpurified, ethyl acetate purified, and pentanol purified tannins at the dosages of 10, 20, 30, and 40 g/kg DM of substrate (Eragrostis curvula hay) were evaluated for gas, CH4, and in vitro organic matter digestibility (IVOMD) in comparison with substrate alone. Gas kinetics were tested using a simple exponential model with lag. The results showed that compared with control, gas, CH4, IVOMD, CH4/gas, CH4/IVOMD, gas/IVOMD, asymptotic gas volume (v), and rate of gas production (k) decreased (p < 0.01) linearly with the increase in the inclusion levels of all tannin extracts. Also, ethyl acetate purified and pentanol purified tannin extracts reduced gas and CH4 at lower dosage (30 g/kg DM) compared to unpurified tannin extract at a higher level (40 g/kg). Pentanol purified tannin was more effective at lower dosage (20 g/kg DM) in terms of CH4/gas and CH4/IVOMD. It was concluded that the purification of mimosa tannin with ethyl acetate and pentanol reduced potential gas production and CH4 without much reduction in substrate digestibility when up to 30 g/kg DM of feed was used. Lower inclusion levels of ethyl acetate and pentanol purified extracts could give a similar result with a higher dosage of unpurified tannin.
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10
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Bahls MO, Platz L, Morgado G, Schmidt GW, Panke S. Directed evolution of biofuel-responsive biosensors for automated optimization of branched-chain alcohol biosynthesis. Metab Eng 2021; 69:98-111. [PMID: 34767976 DOI: 10.1016/j.ymben.2021.10.014] [Citation(s) in RCA: 13] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/05/2021] [Revised: 10/21/2021] [Accepted: 10/31/2021] [Indexed: 12/18/2022]
Abstract
The biosynthesis of short-chain alcohols is a carbon-neutral alternative to petroleum-derived production, but strain screening operations are encumbered by laborious analytics. Here, we built, characterized and applied whole cell biosensors by directed evolution of the transcription factor AlkS for screening microbial strain libraries producing industrially relevant alcohols. A selected AlkS variant was applied for in situ product detection in two screening applications concerning key steps in alcohol production. Further, the biosensor strains enabled the implementation of an automated, robotic platform-based workflow with data clustering, which readily allowed the identification of significantly improved strain variants for isopentanol production.
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Affiliation(s)
- Maximilian O Bahls
- Department of Biosystems Science and Engineering, ETH Zurich, Switzerland
| | - Lukas Platz
- Department of Biosystems Science and Engineering, ETH Zurich, Switzerland
| | - Gaspar Morgado
- Department of Biosystems Science and Engineering, ETH Zurich, Switzerland
| | - Gregor W Schmidt
- Department of Biosystems Science and Engineering, ETH Zurich, Switzerland
| | - Sven Panke
- Department of Biosystems Science and Engineering, ETH Zurich, Switzerland.
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Feng Y, Zhu J, Wang S, Yu L, He Z, Qian Y, Lu X. Theoretical and Experimental Study of 3-Pentanol Autoignition: Ab Initio Calculation, Shock Tube Experiments, and Kinetic Modeling. J Phys Chem A 2021; 125:5976-5989. [PMID: 34213330 DOI: 10.1021/acs.jpca.1c02713] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
3-Pentanol is a potential alternative fuel or a green fuel additive for modern engines. The H-abstraction reactions from 3-pentanol by H, CH3, HO2, and OH radicals are significant in the 3-pentanol oxidation process. However, corresponding rate constants are forced to rely on either analogy from sec-butanol or estimation from alkanes due to a lack of direct experimental and theoretical study. In this work, stationary points on the potential energy surfaces (PESs) were calculated with the high-level DLPNO-CCSD(T)/CBS(T-Q)//M06-2X/cc-pVTZ method, which is further used to benchmark against the CBS-QB3 method. Then, the high-pressure limit rate constants for target reactions, over a broad range of temperature (400-2000 K), were calculated with the phase-space theory and conventional transition state theory. A comparison was made between the calculated rate constants and the values available in Carbonnier et al. [ Proc. Combust. Inst. 2019, 37(1), 477-484]. The rate constants for the above H-abstraction reactions in the Carbonnier model were updated with the calculated results, followed by a modification based on the computed results of 3-pentanol + HO2 to obtain the revised model. Validation against the shock tube (ST) and the jet-stirred reactor (JSR) measurements from the literature proved the revised model an optimal one. Furthermore, using an ST, ignition delay times (IDTs) for the 3-pentanol/air mixtures were measured spanning a temperature range of 920-1450 K, pressures of 6, 10, and 20 bar, and equivalence ratios of 0.5, 1.0, and 1.5. Generally, IDTs decrease with increasing temperature and reflected shock pressure. Improved predictions to present experimental data were obtained by using the revised model as compared with the Carbonnier model. Finally, sensitivity analysis was conducted using the revised model to gain an in-depth comprehension of the 3-pentanol autoignition.
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Affiliation(s)
- Yuan Feng
- Key Laboratory for Power Machinery and Engineering of M. O. E, Shanghai Jiao Tong University, 200240 Shanghai, P. R. China
| | - Jizhen Zhu
- Key Laboratory for Power Machinery and Engineering of M. O. E, Shanghai Jiao Tong University, 200240 Shanghai, P. R. China
| | - Sixu Wang
- Key Laboratory for Power Machinery and Engineering of M. O. E, Shanghai Jiao Tong University, 200240 Shanghai, P. R. China
| | - Liang Yu
- Key Laboratory for Power Machinery and Engineering of M. O. E, Shanghai Jiao Tong University, 200240 Shanghai, P. R. China
| | - Zhuoyao He
- Key Laboratory for Power Machinery and Engineering of M. O. E, Shanghai Jiao Tong University, 200240 Shanghai, P. R. China
| | - Yong Qian
- Key Laboratory for Power Machinery and Engineering of M. O. E, Shanghai Jiao Tong University, 200240 Shanghai, P. R. China
| | - Xingcai Lu
- Key Laboratory for Power Machinery and Engineering of M. O. E, Shanghai Jiao Tong University, 200240 Shanghai, P. R. China
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Hong J, Zhao D, Sun B. Research Progress on the Profile of Trace Components in Baijiu. FOOD REVIEWS INTERNATIONAL 2021. [DOI: 10.1080/87559129.2021.1936001] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
Affiliation(s)
- Jiaxin Hong
- Beijing Laboratory of Food Quality and Safety, School of Light Industry, Beijing Technology and Business University, Beijing, China
- Key Laboratory of Brewing Molecular Engineering of China Light Industry, School of Light Industry, Beijing Technology and Business University, Beijing, China
| | - Dongrui Zhao
- Beijing Laboratory of Food Quality and Safety, School of Light Industry, Beijing Technology and Business University, Beijing, China
- Key Laboratory of Brewing Molecular Engineering of China Light Industry, School of Light Industry, Beijing Technology and Business University, Beijing, China
| | - Baoguo Sun
- Beijing Laboratory of Food Quality and Safety, School of Light Industry, Beijing Technology and Business University, Beijing, China
- Key Laboratory of Brewing Molecular Engineering of China Light Industry, School of Light Industry, Beijing Technology and Business University, Beijing, China
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13
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Luo Z, Yu S, Zeng W, Zhou J. Comparative analysis of the chemical and biochemical synthesis of keto acids. Biotechnol Adv 2021; 47:107706. [PMID: 33548455 DOI: 10.1016/j.biotechadv.2021.107706] [Citation(s) in RCA: 17] [Impact Index Per Article: 5.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/10/2020] [Revised: 01/25/2021] [Accepted: 01/26/2021] [Indexed: 12/28/2022]
Abstract
Keto acids are essential organic acids that are widely applied in pharmaceuticals, cosmetics, food, beverages, and feed additives as well as chemical synthesis. Currently, most keto acids on the market are prepared via chemical synthesis. The biochemical synthesis of keto acids has been discovered with the development of metabolic engineering and applied toward the production of specific keto acids from renewable carbohydrates using different metabolic engineering strategies in microbes. In this review, we provide a systematic summary of the types and applications of keto acids, and then summarize and compare the chemical and biochemical synthesis routes used for the production of typical keto acids, including pyruvic acid, oxaloacetic acid, α-oxobutanoic acid, acetoacetic acid, ketoglutaric acid, levulinic acid, 5-aminolevulinic acid, α-ketoisovaleric acid, α-keto-γ-methylthiobutyric acid, α-ketoisocaproic acid, 2-keto-L-gulonic acid, 2-keto-D-gluconic acid, 5-keto-D-gluconic acid, and phenylpyruvic acid. We also describe the current challenges for the industrial-scale production of keto acids and further strategies used to accelerate the green production of keto acids via biochemical routes.
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Affiliation(s)
- Zhengshan Luo
- National Engineering Laboratory for Cereal Fermentation Technology, Jiangnan University, 1800 Lihu Road, Wuxi, Jiangsu 214122, China; State Key Laboratory of Materials-Oriented Chemical Engineering, College of Food Science and Light Industry, Nanjing Tech University, Nanjing 211816, China; Key Laboratory of Industrial Biotechnology, Ministry of Education, School of Biotechnology, Jiangnan University, 1800 Lihu Road, Wuxi, Jiangsu 214122, China
| | - Shiqin Yu
- National Engineering Laboratory for Cereal Fermentation Technology, Jiangnan University, 1800 Lihu Road, Wuxi, Jiangsu 214122, China; Key Laboratory of Industrial Biotechnology, Ministry of Education, School of Biotechnology, Jiangnan University, 1800 Lihu Road, Wuxi, Jiangsu 214122, China; Jiangsu Provisional Research Center for Bioactive Product Processing Technology, Jiangnan University, 1800 Lihu Road, Wuxi, Jiangsu 214122, China
| | - Weizhu Zeng
- Key Laboratory of Industrial Biotechnology, Ministry of Education, School of Biotechnology, Jiangnan University, 1800 Lihu Road, Wuxi, Jiangsu 214122, China
| | - Jingwen Zhou
- National Engineering Laboratory for Cereal Fermentation Technology, Jiangnan University, 1800 Lihu Road, Wuxi, Jiangsu 214122, China; Key Laboratory of Industrial Biotechnology, Ministry of Education, School of Biotechnology, Jiangnan University, 1800 Lihu Road, Wuxi, Jiangsu 214122, China; Jiangsu Provisional Research Center for Bioactive Product Processing Technology, Jiangnan University, 1800 Lihu Road, Wuxi, Jiangsu 214122, China.
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Bioaldehydes and beyond: Expanding the realm of bioderived chemicals using biogenic aldehydes as platforms. Curr Opin Chem Biol 2020; 59:37-46. [PMID: 32454426 DOI: 10.1016/j.cbpa.2020.04.007] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/29/2020] [Revised: 04/04/2020] [Accepted: 04/12/2020] [Indexed: 01/06/2023]
Abstract
Biofuels and biochemicals derived from renewable resources are sconsidered as potential solutions for the energy crisis and associated environmental problems that human beings are facing today. However, so far the available types of bioderived chemicals are rather limited, and production efficiency is generally low. Expanding the realm of bioderived chemicals and relevant derivatives can help motivate the development of bioenergy and the general bioeconomy. Aldehydes, possessing unique reactivity, hold great promise as platform chemicals for producing a large portfolio of bioproducts. In this review, we focus on production of aldehydes from renewable bioresources and derivatization of aldehydes through chemocatalysis, biocatalysis, or de novo biosynthesis. Perspectives on combining protein engineering and cascade reactions for advanced aldehyde derivatization are also provided.
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15
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Seemala B, Kumar R, Cai CM, Wyman CE, Christopher P. Single-step catalytic conversion of furfural to 2-pentanol over bimetallic Co–Cu catalysts. REACT CHEM ENG 2019. [DOI: 10.1039/c8re00195b] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Catalytic conversion of furfural to 2-pentanol over Co–Cu/Al2O3 catalysts.
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Affiliation(s)
- Bhogeswararao Seemala
- Bourns College of Engineering – Center for Environmental and Research Technology (CE – CERT)
- University of California
- Riverside
- USA
- Department of Chemical and Environmental Engineering
| | - Rajeev Kumar
- Bourns College of Engineering – Center for Environmental and Research Technology (CE – CERT)
- University of California
- Riverside
- USA
| | - Charles M. Cai
- Bourns College of Engineering – Center for Environmental and Research Technology (CE – CERT)
- University of California
- Riverside
- USA
- Department of Chemical and Environmental Engineering
| | - Charles E. Wyman
- Bourns College of Engineering – Center for Environmental and Research Technology (CE – CERT)
- University of California
- Riverside
- USA
- Department of Chemical and Environmental Engineering
| | - Phillip Christopher
- Department of Chemical and Environmental Engineering
- Bourns College of Engineering
- University of California
- Riverside
- USA
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16
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Damodharan D, Sathiyagnanam AP, Rajesh Kumar B, Ganesh KC. Cleaner emissions from a DI diesel engine fueled with waste plastic oil derived from municipal solid waste under the influence of n-pentanol addition, cold EGR, and injection timing. ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH INTERNATIONAL 2018; 25:13611-13625. [PMID: 29497945 DOI: 10.1007/s11356-018-1558-5] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/17/2017] [Accepted: 02/13/2018] [Indexed: 06/08/2023]
Abstract
Urban planning and development is a decisive factor that increases the automobile numbers which leads to increased energy demand across the globe. In order to meet the escalating requirements of energy, it is necessary to find viable alternatives. Waste plastic oil (WPO) is one such alternative which has dual benefits as it reduces the environmental pollution caused by plastic waste and it could possibly meet the energy requirement along with fossil fuels. The study attempted to reduce emissions from a DI diesel engine fueled with WPO using 30% by volume of n-pentanol with fossil diesel (WPO70P30). EGR (10, 20, and 30%) and injection timing modifications were made with the intention to find optimum engine operating conditions. The experimental results indicated that addition of renewable component like n-pentanol had improved the combustion characteristics by igniting WPO more homogeneously producing a higher premixed combustion phase. Smoke density for WPO70P30 was found to be twice lower than that of neat WPO at standard injection timing of 23°CA bTDC at any given EGR rate, NOx emissions were slightly on the higher side about 12% for WPO70P30 blend against WPO at same operating conditions. WPO70P30 showed lowest smoke and carbon monoxide emissions than diesel and WPO while delivering BTE's higher than WPO and closer to diesel at all EGR and injection timings. However NOx and HC emissions increased with n-pentanol addition. The use of EGR reduced NOx emissions but was found to aggravate other emissions. It was concluded WPO70P30 can be favorably used in a DI diesel engine at the engines advanced injection timing for better performance than diesel with a slight penalty in NOx emissions.
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Affiliation(s)
- Dillikannan Damodharan
- Department of Mechanical Engineering, Jeppiaar Engineering College, Chennai, TN, India.
- Department of Mechanical Engineering, Annamalai University, Chidambaram, TN, India.
| | | | - Babu Rajesh Kumar
- Department of Industrial Technology, California State University, Fresno, CA, 93740-8002, USA
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17
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Saturated mutagenesis of ketoisovalerate decarboxylase V461 enabled specific synthesis of 1-pentanol via the ketoacid elongation cycle. Sci Rep 2017; 7:11284. [PMID: 28900255 PMCID: PMC5595793 DOI: 10.1038/s41598-017-11624-z] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/27/2017] [Accepted: 08/25/2017] [Indexed: 11/25/2022] Open
Abstract
Iterative ketoacid elongation has been an essential tool in engineering artificial metabolism, in particular the synthetic alcohols. However, precise control of product specificity is still greatly challenged by the substrate promiscuity of the ketoacid decarboxylase, which unselectively hijacks ketoacid intermediates from the elongation cycle along with the target ketoacid. In this work, preferential tuning of the Lactococcus lactis ketoisovalerate decarboxylase (Kivd) specificity toward 1-pentanol synthesis was achieved via saturated mutagenesis of the key residue V461 followed by screening of the resulting alcohol spectrum. Substitution of V461 with the small and polar amino acid glycine or serine significantly improved the Kivd selectivity toward the 1-pentanol precursor 2-ketocaproate by lowering its catalytic efficiency for the upstream ketoacid 2-ketobutyrate and 2-ketovalerate. Conversely, replacing V461 with bulky or charged side chains displayed severely adverse effect. Increasing supply of the iterative addition unit acetyl-CoA by acetate feeding further drove 2-ketoacid flux into the elongation cycle and enhanced 1-pentanol productivity. The Kivd V461G variant enabled a 1-pentanol production specificity around 90% of the total alcohol content with or without oleyl alcohol extraction. This work adds insight to the selectivity of Kivd active site.
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18
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Gomaa L, Loscar ME, Zein HS, Abdel-Ghaffar N, Abdelhadi AA, Abdelaal AS, Abdallah NA. Boosting isoprene production via heterologous expression of the Kudzu isoprene synthase gene (kIspS) into Bacillus spp. cell factory. AMB Express 2017; 7:161. [PMID: 28791618 PMCID: PMC5548705 DOI: 10.1186/s13568-017-0461-7] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/29/2017] [Accepted: 07/23/2017] [Indexed: 11/17/2022] Open
Abstract
Isoprene represents a key building block for the production of valuable materials such as latex, synthetic rubber or pharmaceutical precursors and serves as basis for advanced biofuel production. To enhance the production of the volatile natural hydrocarbon isoprene, released by plants, animals and bacteria, the Kudzu isoprene synthase (kIspS) gene has been heterologously expressed in Bacillus subtilis DSM 402 and Bacillus licheniformis DSM 13 using the pHT01 vector. As control, the heterologous expression of KIspS in E. coli BL21 (DE3) with the pET28b vector was used. Isoprene production was analyzed using Gas Chromatography Flame Ionization Detector. The highest isoprene production was observed by recombinant B. subtilis harboring the pHT01-kIspS plasmid which produced 1434.3 μg/L (1275 µg/L/OD) isoprene. This is threefold higher than the wild type which produced 388 μg/L (370 μg/L/OD) isoprene, when both incubated at 30 °C for 48 h and induced with 0.1 mM IPTG. Additionally, recombinant B. subtilis produced fivefold higher than the recombinant B. licheniformis, which produced 437.2 μg/L (249 μg/L/OD) isoprene when incubated at 37 °C for 48 h induced with 0.1 mM IPTG. This is the first report of optimized isoprene production in B. licheniformis. However, recombinant B. licheniformis showed less isoprene production. Therefore, recombinant B. subtilis is considered as a versatile host for heterologous production of isoprene.
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19
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Huang Q, Liang L, Wu W, Wu S, Huang J. Metabolic engineering of Corynebacterium glutamicum to enhance L-leucine production. ACTA ACUST UNITED AC 2017. [DOI: 10.5897/ajb2017.15911] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/31/2022]
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20
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Ravikumar J, Saravanan S. Performance and emission analysis on blends of diesel, restaurant yellow grease and n-pentanol in direct-injection diesel engine. ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH INTERNATIONAL 2017; 24:5381-5390. [PMID: 28013468 DOI: 10.1007/s11356-016-8298-1] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/30/2016] [Accepted: 12/19/2016] [Indexed: 06/06/2023]
Abstract
Yellow grease from restaurants is typically waste cooking oil (WCO) free from suspended food particles with free fatty acid (FFA) content less than 15%. This study proposes an approach to formulate a renewable, eco-friendly fuel by recycling WCO with diesel (D) and n-pentanol (P) to improve fuel-spray characteristics. Three ternary blends (D50-WCO45-P5, D50-WCO40-P10 and D50-WCO30-P20) were selected based on the stability tests and prepared with an objective to substitute diesel by 50% with up to 45% recycled component (WCO) and up to 20% bio-component (n-pentanol) by volume. The fuel properties of these ternary blends were measured and compared. The emission impacts of these blends on a diesel engine were analysed in comparison with diesel and D50-WCO50 (50% of diesel + 50% of WCO) under naturally articulated and EGR (exhaust gas recirculation) approaches. Doping of n-pentanol showed improved fuel properties when compared to D50-WCO50. Viscosity is reduced up to 45%. Cetane number and density were comparable to that of diesel. Addition of n-pentanol to D50-WCO50 presented improved brake specific fuel consumption (BSFC) for all ternary blends. Brake thermal efficiency (BTE) of D50-WCO30-P20 blend is comparable to diesel due to improved atomization. Smoke opacity reduced, HC emissions increased and CO emissions remained unchanged with doping n-pentanol in the WCO. NOx emission increases with increase in n-pentanol and remained lower than diesel and all load conditions. However, NOx can be decreased by up to threefold using EGR. By adopting this approach, WCO can be effectively reused as a clean energy source by negating environmental hazards before and after its use in diesel engines, instead of being dumped into sewers and landfills.
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Affiliation(s)
- J Ravikumar
- Department of Mechanical Engineering, Jeppiaar Institute of Technology, Chennai, India.
| | - S Saravanan
- Department of Mechanical Engineering, Sri Venkateswara College of Engineering, Chennai, India
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21
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Production of 2-methyl-1-butanol and 3-methyl-1-butanol in engineered Corynebacterium glutamicum. Metab Eng 2016; 38:436-445. [PMID: 27746323 DOI: 10.1016/j.ymben.2016.10.007] [Citation(s) in RCA: 36] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/25/2016] [Revised: 10/11/2016] [Accepted: 10/12/2016] [Indexed: 11/23/2022]
Abstract
The pentanol isomers 2-methyl-1-butanol and 3-methyl-1-butanol represent commercially interesting alcohols due to their potential application as biofuels. For a sustainable microbial production of these compounds, Corynebacterium glutamicum was engineered for producing 2-methyl-1-butanol and 3-methyl-1-butanol via the Ehrlich pathway from 2-keto-3-methylvalerate and 2-ketoisocaproate, respectively. In addition to an already available 2-ketoisocaproate producer, a 2-keto-3-methylvalerate accumulating C. glutamicum strain was also constructed. For this purpose, we reduced the activity of the branched-chain amino acid transaminase in an available C. glutamicuml-isoleucine producer (K2P55) via a start codon exchange in the ilvE gene enabling accumulation of up to 3.67g/l 2-keto-3-methylvalerate. Subsequently, nine strains expressing different gene combinations for three 2-keto acid decarboxylases and three alcohol dehydrogenases were constructed and characterized. The best strains accumulated 0.37g/l 2-methyl-1-butanol and 2.76g/l 3-methyl-1-butanol in defined medium within 48h under oxygen deprivation conditions, making these strains ideal candidates for additional strain and process optimization.
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22
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Yamamoto K, Tsuchisaka A, Yukawa H. Branched-Chain Amino Acids. ADVANCES IN BIOCHEMICAL ENGINEERING/BIOTECHNOLOGY 2016; 159:103-128. [PMID: 27872960 DOI: 10.1007/10_2016_28] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/04/2022]
Abstract
Branched-chain amino acids (BCAAs), viz., L-isoleucine, L-leucine, and L-valine, are essential amino acids that cannot be synthesized in higher organisms and are important nutrition for humans as well as livestock. They are also valued as synthetic intermediates for pharmaceuticals. Therefore, the demand for BCAAs in the feed and pharmaceutical industries is increasing continuously. Traditional industrial fermentative production of BCAAs was performed using microorganisms isolated by random mutagenesis. A collection of these classical strains was also scientifically useful to clarify the details of the BCAA biosynthetic pathways, which are tightly regulated by feedback inhibition and transcriptional attenuation. Based on this understanding of the metabolism of BCAAs, it is now possible for us to pursue strains with higher BCAA productivity using rational design and advanced molecular biology techniques. Additionally, systems biology approaches using augmented omics information help us to optimize carbon flux toward BCAA production. Here, we describe the biosynthetic pathways of BCAAs and their regulation and then overview the microorganisms developed for BCAA production. Other chemicals, including isobutanol, i.e., a second-generation biofuel, can be synthesized by branching the BCAA biosynthetic pathways, which are also outlined.
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Affiliation(s)
- Keisuke Yamamoto
- Green Earth Institute Co., Ltd, Hongo, Tokyo, Japan
- Green Earth Research Center, Kisarazu, Chiba, Japan
| | - Atsunari Tsuchisaka
- Green Earth Institute Co., Ltd, Hongo, Tokyo, Japan
- Green Earth Research Center, Kisarazu, Chiba, Japan
| | - Hideaki Yukawa
- Green Earth Institute Co., Ltd, Hongo, Tokyo, Japan.
- Green Earth Research Center, Kisarazu, Chiba, Japan.
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23
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Beller HR, Lee TS, Katz L. Natural products as biofuels and bio-based chemicals: fatty acids and isoprenoids. Nat Prod Rep 2015. [PMID: 26216573 DOI: 10.1039/c5np00068h] [Citation(s) in RCA: 89] [Impact Index Per Article: 9.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022]
Abstract
Although natural products are best known for their use in medicine and agriculture, a number of fatty acid-derived and isoprenoid natural products are being developed for use as renewable biofuels and bio-based chemicals. This review summarizes recent work on fatty acid-derived compounds (fatty acid alkyl esters, fatty alcohols, medium- and short-chain methyl ketones, alkanes, α-olefins, and long-chain internal alkenes) and isoprenoids, including hemiterpenes (e.g., isoprene and isopentanol), monoterpenes (e.g., limonene), and sesquiterpenes (e.g., farnesene and bisabolene).
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Affiliation(s)
- Harry R Beller
- Joint BioEnergy Institute (JBEI), 5885 Hollis Street, Emeryville, California, 94608 USA.
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24
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Boussid N, Rezgui Y. Effect of the n-butanol addition on cyclopentadienyl radical formation during benzene combustion. KINETICS AND CATALYSIS 2015. [DOI: 10.1134/s0023158415010048] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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25
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Vogt M, Haas S, Polen T, van Ooyen J, Bott M. Production of 2-ketoisocaproate with Corynebacterium glutamicum strains devoid of plasmids and heterologous genes. Microb Biotechnol 2014; 8:351-60. [PMID: 25488800 PMCID: PMC4353348 DOI: 10.1111/1751-7915.12237] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/14/2014] [Revised: 10/07/2014] [Accepted: 10/07/2014] [Indexed: 12/04/2022] Open
Abstract
2-Ketoisocaproate (KIC), the last intermediate in l-leucine biosynthesis, has various medical and industrial applications. After deletion of the ilvE gene for transaminase B in l-leucine production strains of Corynebacterium glutamicum, KIC became the major product, however, the strains were auxotrophic for l-isoleucine. To avoid auxotrophy, reduction of IlvE activity by exchanging the ATG start codon of ilvE by GTG was tested instead of an ilvE deletion. The resulting strains were indeed able to grow in glucose minimal medium without amino acid supplementation, but at the cost of lowered growth rates and KIC production parameters. The best production performance was obtained with strain MV-KICF1, which carried besides the ilvE start codon exchange three copies of a gene for a feedback-resistant 2-isopropylmalate synthase, one copy of a gene for a feedback-resistant acetohydroxyacid synthase and deletions of ltbR and iolR encoding transcriptional regulators. In the presence of 1 mM l-isoleucine, MV-KICF1 accumulated 47 mM KIC (6.1 g l−1) with a yield of 0.20 mol/mol glucose and a volumetric productivity of 1.41 mmol KIC l−1 h−1. Since MV-KICF1 is plasmid free and lacks heterologous genes, it is an interesting strain for industrial application and as platform for the production of KIC-derived compounds, such as 3-methyl-1-butanol.
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Affiliation(s)
- Michael Vogt
- Institute of Bio- and Geosciences, IBG-1: Biotechnology, Forschungszentrum Jülich, D-52425, Jülich, Germany
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26
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Abstract
Engineering microbial hosts for the production of fungible fuels requires mitigation of limitations posed on the production capacity. One such limitation arises from the inherent toxicity of solvent-like biofuel compounds to production strains, such as Escherichia coli. Here we show the importance of host engineering for the production of short-chain alcohols by studying the overexpression of genes upregulated in response to exogenous isopentenol. Using systems biology data, we selected 40 genes that were upregulated following isopentenol exposure and subsequently overexpressed them in E. coli. Overexpression of several of these candidates improved tolerance to exogenously added isopentenol. Genes conferring isopentenol tolerance phenotypes belonged to diverse functional groups, such as oxidative stress response (soxS, fpr, and nrdH), general stress response (metR, yqhD, and gidB), heat shock-related response (ibpA), and transport (mdlB). To determine if these genes could also improve isopentenol production, we coexpressed the tolerance-enhancing genes individually with an isopentenol production pathway. Our data show that expression of 6 of the 8 candidates improved the production of isopentenol in E. coli, with the methionine biosynthesis regulator MetR improving the titer for isopentenol production by 55%. Additionally, expression of MdlB, an ABC transporter, facilitated a 12% improvement in isopentenol production. To our knowledge, MdlB is the first example of a transporter that can be used to improve production of a short-chain alcohol and provides a valuable new avenue for host engineering in biogasoline production. The use of microbial host platforms for the production of bulk commodities, such as chemicals and fuels, is now a focus of many biotechnology efforts. Many of these compounds are inherently toxic to the host microbe, which in turn places a limit on production despite efforts to optimize the bioconversion pathways. In order to achieve economically viable production levels, it is also necessary to engineer production strains with improved tolerance to these compounds. We demonstrate that microbial tolerance engineering using transcriptomics data can also identify targets that improve production. Our results include an exporter and a methionine biosynthesis regulator that improve isopentenol production, providing a starting point to further engineer the host for biogasoline production.
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27
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Su H, Zhao Y, Zhao H, Wang M, Li Q, Jiang J, Lu Q. Identification and assessment of the effects of yeast decarboxylases expressed in Escherichia coli
for producing higher alcohols. J Appl Microbiol 2014; 117:126-38. [DOI: 10.1111/jam.12510] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/17/2014] [Revised: 03/05/2014] [Accepted: 03/21/2014] [Indexed: 01/15/2023]
Affiliation(s)
- H. Su
- Key Laboratory of Bio-resources and Eco-environment of Ministry of Education; College of Life Sciences; Sichuan University; Chengdu China
| | - Y. Zhao
- Key Laboratory of Bio-resources and Eco-environment of Ministry of Education; College of Life Sciences; Sichuan University; Chengdu China
| | - H. Zhao
- Bioenergy Laboratory; Chengdu Institute of Biology; Chinese Academy of Sciences; Chengdu China
| | - M. Wang
- Key Laboratory of Bio-resources and Eco-environment of Ministry of Education; College of Life Sciences; Sichuan University; Chengdu China
| | - Q. Li
- Key Laboratory of Bio-resources and Eco-environment of Ministry of Education; College of Life Sciences; Sichuan University; Chengdu China
| | - J. Jiang
- Key Laboratory of Bio-resources and Eco-environment of Ministry of Education; College of Life Sciences; Sichuan University; Chengdu China
| | - Q. Lu
- Key Laboratory of Bio-resources and Eco-environment of Ministry of Education; College of Life Sciences; Sichuan University; Chengdu China
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28
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Vogt M, Haas S, Klaffl S, Polen T, Eggeling L, van Ooyen J, Bott M. Pushing product formation to its limit: Metabolic engineering of Corynebacterium glutamicum for l-leucine overproduction. Metab Eng 2014; 22:40-52. [DOI: 10.1016/j.ymben.2013.12.001] [Citation(s) in RCA: 95] [Impact Index Per Article: 9.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/28/2013] [Revised: 10/31/2013] [Accepted: 12/03/2013] [Indexed: 11/29/2022]
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29
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Yamamoto S, Suda M, Niimi S, Inui M, Yukawa H. Strain optimization for efficient isobutanol production usingCorynebacterium glutamicumunder oxygen deprivation. Biotechnol Bioeng 2013; 110:2938-48. [DOI: 10.1002/bit.24961] [Citation(s) in RCA: 85] [Impact Index Per Article: 7.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/31/2013] [Revised: 04/18/2013] [Accepted: 05/08/2013] [Indexed: 01/20/2023]
Affiliation(s)
- Shogo Yamamoto
- Research Institute of Innovative Technology for the Earth (RITE); 9-2, Kizugawadai Kizugawa Kyoto 619-0292 Japan
| | - Masako Suda
- Research Institute of Innovative Technology for the Earth (RITE); 9-2, Kizugawadai Kizugawa Kyoto 619-0292 Japan
| | - Satoko Niimi
- Research Institute of Innovative Technology for the Earth (RITE); 9-2, Kizugawadai Kizugawa Kyoto 619-0292 Japan
| | - Masayuki Inui
- Research Institute of Innovative Technology for the Earth (RITE); 9-2, Kizugawadai Kizugawa Kyoto 619-0292 Japan
| | - Hideaki Yukawa
- Research Institute of Innovative Technology for the Earth (RITE); 9-2, Kizugawadai Kizugawa Kyoto 619-0292 Japan
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30
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Juntarachat N, Bouvier N, Lepoutre JP, Roland A, Sainte-Beuve J, Granet F, Salmon JM, Rigou P, Chalier P. Identification by GC-O and GC-MS of new odorous compounds in natural rubber. J Appl Polym Sci 2013. [DOI: 10.1002/app.39356] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Affiliation(s)
- Niramol Juntarachat
- Université de Montpellier 2, UMR-IATE, Ingénierie des Agropolymères et Technologies Emergentes, cc023, pl E. Bataillon; 34095; Montpellier Cedex 05; France
| | - Nicolas Bouvier
- INRA, UMR Sciences Pour l‘œnologie, Plateau Technique d'analyse des Composés Volatils; Bâtiment 28, 2, place Pierre Viala; 34060; Montpellier Cedex 01; France
| | - Jean-Paul Lepoutre
- INRA, UMR Sciences Pour l‘œnologie, Plateau Technique d'analyse des Composés Volatils; Bâtiment 28, 2, place Pierre Viala; 34060; Montpellier Cedex 01; France
| | - Aurélie Roland
- INRA, UMR Sciences Pour l‘œnologie, Plateau Technique d'analyse des Composés Volatils; Bâtiment 28, 2, place Pierre Viala; 34060; Montpellier Cedex 01; France
| | - Jérôme Sainte-Beuve
- CIRAD, UMR IATE, Bâtiment 33 Campus INRA - Supagro; 2 Place Viala; 34060; Montpellier Cedex 01; France
| | - Françoise Granet
- Manufacture Française des Pneumatiques Michelin; 23 Place des Carmes; 63040; Clermont-Ferrand; France
| | - Jean-Michel Salmon
- INRA, UMR Sciences Pour l‘œnologie, Plateau Technique d'analyse des Composés Volatils; Bâtiment 28, 2, place Pierre Viala; 34060; Montpellier Cedex 01; France
| | - Peggy Rigou
- INRA, UMR Sciences Pour l‘œnologie, Plateau Technique d'analyse des Composés Volatils; Bâtiment 28, 2, place Pierre Viala; 34060; Montpellier Cedex 01; France
| | - Pascale Chalier
- Université de Montpellier 2, UMR-IATE, Ingénierie des Agropolymères et Technologies Emergentes, cc023, pl E. Bataillon; 34095; Montpellier Cedex 05; France
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31
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Zhao L, Ye L, Zhang F, Zhang L. Thermal Decomposition of 1-Pentanol and Its Isomers: A Theoretical Study. J Phys Chem A 2012; 116:9238-44. [DOI: 10.1021/jp305885s] [Citation(s) in RCA: 36] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Long Zhao
- National Synchrotron Radiation Laboratory, University of Science and Technology of China, Hefei,
Anhui 230029, P. R. China
| | - Lili Ye
- National Synchrotron Radiation Laboratory, University of Science and Technology of China, Hefei,
Anhui 230029, P. R. China
| | - Feng Zhang
- National Synchrotron Radiation Laboratory, University of Science and Technology of China, Hefei,
Anhui 230029, P. R. China
| | - Lidong Zhang
- National Synchrotron Radiation Laboratory, University of Science and Technology of China, Hefei,
Anhui 230029, P. R. China
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32
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Shiramizu M, Toste FD. Deoxygenation of Biomass-Derived Feedstocks: Oxorhenium-Catalyzed Deoxydehydration of Sugars and Sugar Alcohols. Angew Chem Int Ed Engl 2012. [DOI: 10.1002/ange.201203877] [Citation(s) in RCA: 79] [Impact Index Per Article: 6.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
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33
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Shiramizu M, Toste FD. Deoxygenation of Biomass-Derived Feedstocks: Oxorhenium-Catalyzed Deoxydehydration of Sugars and Sugar Alcohols. Angew Chem Int Ed Engl 2012; 51:8082-6. [DOI: 10.1002/anie.201203877] [Citation(s) in RCA: 198] [Impact Index Per Article: 16.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/19/2012] [Indexed: 11/11/2022]
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34
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Tormena CF, Evans R, Haiber S, Nilsson M, Morris GA. Matrix-assisted diffusion-ordered spectroscopy: application of surfactant solutions to the resolution of isomer spectra. MAGNETIC RESONANCE IN CHEMISTRY : MRC 2012; 50:458-465. [PMID: 22549888 DOI: 10.1002/mrc.3822] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/06/2012] [Revised: 03/28/2012] [Accepted: 04/02/2012] [Indexed: 05/31/2023]
Abstract
The component spectra of a mixture of isomers with nearly identical diffusion coefficients cannot normally be distinguished in a standard diffusion-ordered spectroscopy (DOSY) experiment but can often be easily resolved using matrix-assisted DOSY, in which diffusion behaviour is manipulated by the addition of a co-solute such as a surfactant. Relatively little is currently known about the conditions required for such a separation, for example, how the choice between normal and reverse micelles affects separation or how the isomer structures themselves affect the resolution. The aim of this study was to explore the application of sodium dodecyl sulfate (SDS) normal micelles in aqueous solution and sodium 1,4-bis(2-ethylhexyl)sulfosuccinate (AOT) aggregates in chloroform, at a range of concentrations, to the diffusion resolution of some simple model sets of isomers such as monomethoxyphenols and short chain alcohols. It is shown that SDS micelles offer better resolution where these isomers differ in the position of a hydroxyl group, whereas AOT aggregates are more effective for isomers differing in the position of a methyl group. For both the normal SDS micelles and the less well-defined AOT aggregates, differences in the resolution of the isomers can in part be rationalised in terms of differing degrees of hydrophobicity, amphiphilicity and steric effects.
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Affiliation(s)
- Cláudio F Tormena
- Chemistry Institute, University of Campinas, Campinas, São Paulo, Brazil, CP 6154 - CEP 13094-971
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Taylor M, Ramond JB, Tuffin M, Burton S, Eley K, Cowan D. Mechanisms and Applications of Microbial Solvent Tolerance. MICROBIOLOGY MONOGRAPHS 2012. [DOI: 10.1007/978-3-642-21467-7_8] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 02/10/2023]
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Matsuda F, Furusawa C, Kondo T, Ishii J, Shimizu H, Kondo A. Engineering strategy of yeast metabolism for higher alcohol production. Microb Cell Fact 2011; 10:70. [PMID: 21902829 PMCID: PMC3184262 DOI: 10.1186/1475-2859-10-70] [Citation(s) in RCA: 41] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/25/2011] [Accepted: 09/08/2011] [Indexed: 01/27/2023] Open
Abstract
Background While Saccharomyces cerevisiae is a promising host for cost-effective biorefinary processes due to its tolerance to various stresses during fermentation, the metabolically engineered S. cerevisiae strains exhibited rather limited production of higher alcohols than that of Escherichia coli. Since the structure of the central metabolism of S. cerevisiae is distinct from that of E. coli, there might be a problem in the structure of the central metabolism of S. cerevisiae. In this study, the potential production of higher alcohols by S. cerevisiae is compared to that of E. coli by employing metabolic simulation techniques. Based on the simulation results, novel metabolic engineering strategies for improving higher alcohol production by S. cerevisiae were investigated by in silico modifications of the metabolic models of S. cerevisiae. Results The metabolic simulations confirmed that the high production of butanols and propanols by the metabolically engineered E. coli strains is derived from the flexible behavior of their central metabolism. Reducing this flexibility by gene deletion is an effective strategy to restrict the metabolic states for producing target alcohols. In contrast, the lower yield using S. cerevisiae originates from the structurally limited flexibility of its central metabolism in which gene deletions severely reduced cell growth. Conclusions The metabolic simulation demonstrated that the poor productivity of S. cerevisiae was improved by the introduction of E. coli genes to compensate the structural difference. This suggested that gene supplementation is a promising strategy for the metabolic engineering of S. cerevisiae to produce higher alcohols which should be the next challenge for the synthetic bioengineering of S. cerevisiae for the efficient production of higher alcohols.
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Affiliation(s)
- Fumio Matsuda
- Organization of Advanced Science and Technology, Kobe University, Rokkodaicho, Nada-ku, Kobe, Hyogo, Japan
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Redesigning Escherichia coli metabolism for anaerobic production of isobutanol. Appl Environ Microbiol 2011; 77:4894-904. [PMID: 21642415 DOI: 10.1128/aem.00382-11] [Citation(s) in RCA: 87] [Impact Index Per Article: 6.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
Abstract
Fermentation enables the production of reduced metabolites, such as the biofuels ethanol and butanol, from fermentable sugars. This work demonstrates a general approach for designing and constructing a production host that uses a heterologous pathway as an obligately fermentative pathway to produce reduced metabolites, specifically, the biofuel isobutanol. Elementary mode analysis was applied to design an Escherichia coli strain optimized for isobutanol production under strictly anaerobic conditions. The central metabolism of E. coli was decomposed into 38,219 functional, unique, and elementary modes (EMs). The model predictions revealed that during anaerobic growth E. coli cannot produce isobutanol as the sole fermentative product. By deleting 7 chromosomal genes, the total 38,219 EMs were constrained to 12 EMs, 6 of which can produce high yields of isobutanol in a range from 0.29 to 0.41 g isobutanol/g glucose under anaerobic conditions. The remaining 6 EMs rely primarily on the pyruvate dehydrogenase enzyme complex (PDHC) and are typically inhibited under anaerobic conditions. The redesigned E. coli strain was constrained to employ the anaerobic isobutanol pathways through deletion of 7 chromosomal genes, addition of 2 heterologous genes, and overexpression of 5 genes. Here we present the design, construction, and characterization of an isobutanol-producing E. coli strain to illustrate the approach. The model predictions are evaluated in relation to experimental data and strategies proposed to improve anaerobic isobutanol production. We also show that the endogenous alcohol/aldehyde dehydrogenase AdhE is the key enzyme responsible for the production of isobutanol and ethanol under anaerobic conditions. The glycolytic flux can be controlled to regulate the ratio of isobutanol to ethanol production.
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Conversion of proteins into biofuels by engineering nitrogen flux. Nat Biotechnol 2011; 29:346-51. [DOI: 10.1038/nbt.1789] [Citation(s) in RCA: 239] [Impact Index Per Article: 18.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/30/2010] [Accepted: 01/26/2011] [Indexed: 11/08/2022]
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Mainguet SE, Liao JC. Bioengineering of microorganisms for C3 to C5 alcohols production. Biotechnol J 2010; 5:1297-308. [DOI: 10.1002/biot.201000276] [Citation(s) in RCA: 31] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
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