1
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Caratenuto A, Leach K, Liu Y, Zheng Y. Nanofibrous Biomaterial-Based Passive Cooling Paint Structurally Linked by Alkane-Oleate Interactions. ACS Appl Mater Interfaces 2024; 16:12717-12730. [PMID: 38427802 PMCID: PMC10941070 DOI: 10.1021/acsami.4c01383] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/25/2024] [Revised: 02/16/2024] [Accepted: 02/24/2024] [Indexed: 03/03/2024]
Abstract
Passive radiative cooling materials, which provide cooling without consuming electricity, are widely recognized as an important technology for reducing greenhouse gas emissions and delivering thermal comfort to less industrialized communities. Optimizing thermal and optical properties is of primary importance for these materials, but for real-world utilization, ease of application and scalability also require significant emphasis. In this work, we embed the biomaterial hydroxyapatite, in the form of nanoscale fibers, within an oil-based medium to achieve passive cooling from an easy-to-apply paint-like solution. The chemical structure and bonding behaviors of this mixture are studied in detail using FTIR, providing transferable conclusions for pigment-like passive cooling solutions. By reflecting 95% of solar energy and emitting 92% of its radiative output through the atmospheric transparency window, this composite material realizes an average subambient cooling performance of 3.7 °C in outdoor conditions under a mean solar irradiance of 800 W m-2. The inflammability of the material provides enhanced durability as well as unique opportunities for recycling which promote circular economic practices. Finally, the surface structure can be easily altered to tune bonding behaviors and hydrophobicity, making it an ideal passive cooling coating candidate for outdoor applications.
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Affiliation(s)
- Andrew Caratenuto
- Department
of Mechanical and Industrial Engineering, Northeastern University, Boston, Massachusetts 02115, United States
| | - Kyle Leach
- Department
of Mechanical and Industrial Engineering, Northeastern University, Boston, Massachusetts 02115, United States
| | - Yang Liu
- Department
of Mechanical and Industrial Engineering, Northeastern University, Boston, Massachusetts 02115, United States
| | - Yi Zheng
- Department
of Mechanical and Industrial Engineering, Northeastern University, Boston, Massachusetts 02115, United States
- Department
of Chemical Engineering, Northeastern University, Boston, Massachusetts 02115, United States
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2
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Motokura K. Interparticle Hydrogen Spillover in Enhanced Catalytic Reactions. Chem Asian J 2024:e202301083. [PMID: 38319789 DOI: 10.1002/asia.202301083] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/01/2023] [Revised: 12/27/2023] [Indexed: 02/08/2024]
Abstract
Interparticle hydrogen spillover is the phenomenon of H migration over different catalyst particles, which should be a physical mixture of at least two solid catalysts. In this review, we analyze examples of enhanced catalysis based on interparticle (reverse) hydrogen spillover. Simple physical mixtures of powdered catalysts containing metal catalysts of H2 dissociation/recombination and solid catalysts with active sites for substrate activation significantly enhance catalytic reactions. These reactions include aromatic hydrogenation, CO2 methanation, and the deoxydehydration of polyols, aromatization of lower paraffins, and direct coupling of benzene and alkanes. The acceleration effect and proposed reaction pathway of each example involving interparticle (reverse) hydrogen spillover are summarized. Simple reaction systems comprising physical mixtures of at least two powdery solid catalysts should enable unique catalysis in the future with the aid of interparticle (reverse) hydrogen spillover.
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Affiliation(s)
- Ken Motokura
- Department of Chemistry and Life Science, Yokohama National University, 79-5 Tokiwadai, Hodogaya-ku, Yokohama, 240-8501, Japan
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3
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Jaroensuk J, Sutthaphirom C, Phonbuppha J, Chinantuya W, Kesornpun C, Akeratchatapan N, Kittipanukul N, Phatinuwat K, Atichartpongkul S, Fuangthong M, Pongtharangkul T, Hollmann F, Chaiyen P. A versatile in situ cofactor enhancing system for meeting cellular demands for engineered metabolic pathways. J Biol Chem 2024; 300:105598. [PMID: 38159859 PMCID: PMC10850783 DOI: 10.1016/j.jbc.2023.105598] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/17/2023] [Revised: 12/02/2023] [Accepted: 12/18/2023] [Indexed: 01/03/2024] Open
Abstract
Cofactor imbalance obstructs the productivities of metabolically engineered cells. Herein, we employed a minimally perturbing system, xylose reductase and lactose (XR/lactose), to increase the levels of a pool of sugar phosphates which are connected to the biosynthesis of NAD(P)H, FAD, FMN, and ATP in Escherichia coli. The XR/lactose system could increase the amounts of the precursors of these cofactors and was tested with three different metabolically engineered cell systems (fatty alcohol biosynthesis, bioluminescence light generation, and alkane biosynthesis) with different cofactor demands. Productivities of these cells were increased 2-4-fold by the XR/lactose system. Untargeted metabolomic analysis revealed different metabolite patterns among these cells, demonstrating that only metabolites involved in relevant cofactor biosynthesis were altered. The results were also confirmed by transcriptomic analysis. Another sugar reducing system (glucose dehydrogenase) could also be used to increase fatty alcohol production but resulted in less yield enhancement than XR. This work demonstrates that the approach of increasing cellular sugar phosphates can be a generic tool to increase in vivo cofactor generation upon cellular demand for synthetic biology.
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Affiliation(s)
- Juthamas Jaroensuk
- School of Biomolecular Science and Engineering, Vidyasirimedhi Institute of Science and Technology (VISTEC), Rayong, Thailand
| | - Chalermroj Sutthaphirom
- School of Biomolecular Science and Engineering, Vidyasirimedhi Institute of Science and Technology (VISTEC), Rayong, Thailand
| | - Jittima Phonbuppha
- School of Biomolecular Science and Engineering, Vidyasirimedhi Institute of Science and Technology (VISTEC), Rayong, Thailand
| | - Wachirawit Chinantuya
- School of Biomolecular Science and Engineering, Vidyasirimedhi Institute of Science and Technology (VISTEC), Rayong, Thailand; Faculty of Science, Department of Biochemistry and Center for Excellence in Protein and Enzyme Technology, Mahidol University, Bangkok, Thailand
| | - Chatchai Kesornpun
- School of Biomolecular Science and Engineering, Vidyasirimedhi Institute of Science and Technology (VISTEC), Rayong, Thailand
| | - Nattanon Akeratchatapan
- School of Biomolecular Science and Engineering, Vidyasirimedhi Institute of Science and Technology (VISTEC), Rayong, Thailand
| | - Narongyot Kittipanukul
- School of Biomolecular Science and Engineering, Vidyasirimedhi Institute of Science and Technology (VISTEC), Rayong, Thailand
| | - Kamonwan Phatinuwat
- Program in Applied Biological Sciences, Chulabhorn Graduate Institute, Bangkok, Thailand
| | | | - Mayuree Fuangthong
- Program in Applied Biological Sciences, Chulabhorn Graduate Institute, Bangkok, Thailand; Laboratory of Biotechnology, Chulabhorn Research Institute, Bangkok, Thailand
| | | | - Frank Hollmann
- Department of Biotechnology, Delft University of Technology, Delft, Netherlands
| | - Pimchai Chaiyen
- School of Biomolecular Science and Engineering, Vidyasirimedhi Institute of Science and Technology (VISTEC), Rayong, Thailand.
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4
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Wen C, Li T, Huang Z, Kang QK. Oxidative Dehydrogenation of Alkanes through Homogeneous Base Metal Catalysis. CHEM REC 2023; 23:e202300146. [PMID: 37283443 DOI: 10.1002/tcr.202300146] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/24/2023] [Revised: 05/25/2023] [Indexed: 06/08/2023]
Abstract
Preparing valuable olefins from cheap and abundant alkane resources has long been a challenging task in organic synthesis, which mainly suffers from harsh reaction conditions and narrow scopes. Homogeneous transition metals catalyzed dehydrogenation of alkanes has attracted much attention for its excellent catalytic activities under relatively milder conditions. Among them, base metal catalyzed oxidative alkane dehydrogenation has emerged as a viable strategy for olefin synthesis for its usage of cheap catalysts, compatibility with various functional groups, and low reaction temperature. In this review, we discuss recent development of base metal catalyzed alkane dehydrogenation under oxidative conditions and their application in constructing complex molecules.
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Affiliation(s)
- Chenxi Wen
- School of Chemistry and Material Sciences, Hangzhou Institute of Advanced Study, University of Chinese Academy of Sciences, 1 Sub-lane Xiangshan, Hangzhou, 310024, China
| | - Ting Li
- School of Chemistry and Material Sciences, Hangzhou Institute of Advanced Study, University of Chinese Academy of Sciences, 1 Sub-lane Xiangshan, Hangzhou, 310024, China
| | - Zheng Huang
- School of Chemistry and Material Sciences, Hangzhou Institute of Advanced Study, University of Chinese Academy of Sciences, 1 Sub-lane Xiangshan, Hangzhou, 310024, China
- The State Key Laboratory of Organometallic Chemistry, Shanghai Institute of Organic Chemistry, University of Chinese Academy of Sciences, Chinese Academy of Sciences, 345 Lingling Road, Shanghai, 200032, China
| | - Qi-Kai Kang
- School of Chemistry and Material Sciences, Hangzhou Institute of Advanced Study, University of Chinese Academy of Sciences, 1 Sub-lane Xiangshan, Hangzhou, 310024, China
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Sui YA, Maruyama S, Okada N, Ito M, Muramatsu M, Obata S, Ogawa J, Kishino S. Alkane production from fatty alcohols by the combined reactions catalyzed by an alcohol dehydrogenase and an aldehyde-deformylating oxygenase. Biosci Biotechnol Biochem 2023:7157094. [PMID: 37156521 DOI: 10.1093/bbb/zbad056] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 05/10/2023]
Abstract
PsADH, an alcohol dehydrogenase originating in Pantoea sp. was characterized and found to convert a broad variety of fatty alcohols into their corresponding aldehydes, the substrates of alkane biosynthesis. By coupling PsADH with NpAD, a cyanobacterial aldehyde-deformylating oxygenase, and by optimizing the conditions of the enzyme-catalyzed reactions, we achieved a 52% conversion of 1-tetradecanol to tridecane. We further applied this system to generate alkanes ranging from C5-17. These alkanes can be used as biofuels, suggesting that introducing a suitable alcohol dehydrogenase is an effective strategy to utilize fatty alcohols for alkane production.
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Affiliation(s)
- Yu-An Sui
- Division of Applied Life Sciences, Graduate School of Agriculture, Kyoto University, Kyoto, Japan
| | - Satoshi Maruyama
- Division of Applied Life Sciences, Graduate School of Agriculture, Kyoto University, Kyoto, Japan
| | - Natsumi Okada
- Division of Applied Life Sciences, Graduate School of Agriculture, Kyoto University, Kyoto, Japan
| | - Masakazu Ito
- Future Project Division, Frontier Research Center, Toyota Motor Corporation, Toyota, Aichi, Japan
| | - Masayoshi Muramatsu
- Future Project Division, Frontier Research Center, Toyota Motor Corporation, Toyota, Aichi, Japan
| | - Shusei Obata
- Future Project Division, Frontier Research Center, Toyota Motor Corporation, Toyota, Aichi, Japan
| | - Jun Ogawa
- Division of Applied Life Sciences, Graduate School of Agriculture, Kyoto University, Kyoto, Japan
| | - Shigenobu Kishino
- Division of Applied Life Sciences, Graduate School of Agriculture, Kyoto University, Kyoto, Japan
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6
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Wei G, Li S, Ye S, Wang Z, Zarringhalam K, He J, Wang W, Shao Z. High-Resolution Small RNAs Landscape Provides Insights into Alkane Adaptation in the Marine Alkane-Degrader Alcanivorax dieselolei B-5. Int J Mol Sci 2022; 23:ijms232415995. [PMID: 36555635 PMCID: PMC9788540 DOI: 10.3390/ijms232415995] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/10/2022] [Revised: 12/07/2022] [Accepted: 12/07/2022] [Indexed: 12/23/2022] Open
Abstract
Alkanes are widespread in the ocean, and Alcanivorax is one of the most ubiquitous alkane-degrading bacteria in the marine ecosystem. Small RNAs (sRNAs) are usually at the heart of regulatory pathways, but sRNA-mediated alkane metabolic adaptability still remains largely unknown due to the difficulties of identification. Here, differential RNA sequencing (dRNA-seq) modified with a size selection (~50-nt to 500-nt) strategy was used to generate high-resolution sRNAs profiling in the model species Alcanivorax dieselolei B-5 under alkane (n-hexadecane) and non-alkane (acetate) conditions. As a result, we identified 549 sRNA candidates at single-nucleotide resolution of 5'-ends, 63.4% of which are with transcription start sites (TSSs), and 36.6% of which are with processing sites (PSSs) at the 5'-ends. These sRNAs originate from almost any location in the genome, regardless of intragenic (65.8%), antisense (20.6%) and intergenic (6.2%) regions, and RNase E may function in the maturation of sRNAs. Most sRNAs locally distribute across the 15 reference genomes of Alcanivorax, and only 7.5% of sRNAs are broadly conserved in this genus. Expression responses to the alkane of several core conserved sRNAs, including 6S RNA, M1 RNA and tmRNA, indicate that they may participate in alkane metabolisms and result in more actively global transcription, RNA processing and stresses mitigation. Two novel CsrA-related sRNAs are identified, which may be involved in the translational activation of alkane metabolism-related genes by sequestering the global repressor CsrA. The relationships of sRNAs with the characterized genes of alkane sensing (ompS), chemotaxis (mcp, cheR, cheW2), transporting (ompT1, ompT2, ompT3) and hydroxylation (alkB1, alkB2, almA) were created based on the genome-wide predicted sRNA-mRNA interactions. Overall, the sRNA landscape lays the ground for uncovering cryptic regulations in critical marine bacterium, among which both the core and species-specific sRNAs are implicated in the alkane adaptive metabolisms.
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Affiliation(s)
- Guangshan Wei
- School of Marine Sciences, Sun Yat-Sen University, Zhuhai 519082, China
- Key Laboratory of Marine Genetic Resources, Third Institute of Oceanography, Ministry of Natural Resources, Xiamen 361005, China
- State Key Laboratory Breeding Base of Marine Genetic Resources, Key Laboratory of Marine Genetic Resources of Fujian Province, Xiamen 361005, China
- Southern Marine Science and Engineering Guangdong Laboratory (Zhuhai), Zhuhai 519000, China
| | - Sujie Li
- Key Laboratory of Marine Genetic Resources, Third Institute of Oceanography, Ministry of Natural Resources, Xiamen 361005, China
- State Key Laboratory Breeding Base of Marine Genetic Resources, Key Laboratory of Marine Genetic Resources of Fujian Province, Xiamen 361005, China
| | - Sida Ye
- Department of Mathematics, University of Massachusetts Boston, Boston, MA 02125, USA
- Center for Personalized Cancer Therapy, University of Massachusetts Boston, Boston, MA 02125, USA
| | - Zining Wang
- Key Laboratory of Marine Genetic Resources, Third Institute of Oceanography, Ministry of Natural Resources, Xiamen 361005, China
- State Key Laboratory Breeding Base of Marine Genetic Resources, Key Laboratory of Marine Genetic Resources of Fujian Province, Xiamen 361005, China
| | - Kourosh Zarringhalam
- Department of Mathematics, University of Massachusetts Boston, Boston, MA 02125, USA
- Center for Personalized Cancer Therapy, University of Massachusetts Boston, Boston, MA 02125, USA
| | - Jianguo He
- School of Marine Sciences, Sun Yat-Sen University, Zhuhai 519082, China
- Southern Marine Science and Engineering Guangdong Laboratory (Zhuhai), Zhuhai 519000, China
| | - Wanpeng Wang
- Key Laboratory of Marine Genetic Resources, Third Institute of Oceanography, Ministry of Natural Resources, Xiamen 361005, China
- State Key Laboratory Breeding Base of Marine Genetic Resources, Key Laboratory of Marine Genetic Resources of Fujian Province, Xiamen 361005, China
- Correspondence: (W.W.); (Z.S.)
| | - Zongze Shao
- School of Marine Sciences, Sun Yat-Sen University, Zhuhai 519082, China
- Key Laboratory of Marine Genetic Resources, Third Institute of Oceanography, Ministry of Natural Resources, Xiamen 361005, China
- State Key Laboratory Breeding Base of Marine Genetic Resources, Key Laboratory of Marine Genetic Resources of Fujian Province, Xiamen 361005, China
- Southern Marine Science and Engineering Guangdong Laboratory (Zhuhai), Zhuhai 519000, China
- Correspondence: (W.W.); (Z.S.)
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7
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Sui YA, Kishino S, Maruyama S, Ito M, Muramatsu M, Obata S, Ogawa J. Utilizing Alcohol for Alkane Biosynthesis by Introducing a Fatty Alcohol Dehydrogenase. Appl Environ Microbiol 2022; 88:e0126422. [PMID: 36416567 DOI: 10.1128/aem.01264-22] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022] Open
Abstract
Alkanes produced by microorganisms are expected to be an alternative to fossil fuels as an energy source. Microbial synthesis of alkanes involves the formation of fatty aldehydes via fatty acyl coenzyme A (acyl-CoA) intermediates derived from fatty acid metabolism, followed by aldehyde decarbonylation to generate alkanes. Advancements in metabolic engineering have enabled the construction of such pathways in various microorganisms, including Escherichia coli. However, endogenous aldehyde reductases in the host microorganisms are highly active in converting fatty aldehydes to fatty alcohols, limiting the substrate pool for alkane production. To reuse the alcohol by-product, a screening of fatty alcohol-assimilating microorganisms was conducted, and a bacterial strain, Pantoea sp. strain 7-4, was found to convert 1-tetradecanol to tetradecanal. From this strain, an alcohol dehydrogenase, PsADH, was purified and found to be involved in 1-tetradecanol-oxidizing reaction. Subsequent heterologous expression of the PsADH gene in E. coli was conducted, and recombinant PsADH was purified for a series of biochemical characterizations, including cofactors, optimal reaction conditions, and kinetic parameters. Furthermore, direct alkane production from alcohol was achieved in E. coli by coexpressing PsADH with a cyanobacterial aldehyde-deformylating oxygenase and a reducing system, including ferredoxin and ferredoxin reductase, from Nostoc punctiforme PCC73102. The alcohol-aldehyde-alkane synthetic route established in this study will provide a new approach to utilizing fatty alcohols for the production of alkane biofuel. IMPORTANCE Alcohol dehydrogenases are a group of enzymes found in many organisms. Unfortunately, studies on these enzymes mainly focus on their activities toward short-chain alcohols. In this study, we discovered an alcohol dehydrogenase, PsADH, from the bacterium Pantoea sp. 7-4, which can oxidize 1-tetradecanol to tetradecanal. The medium-chain aldehyde products generated by this enzyme can serve as the substrate of aldehyde-deformylating oxygenase to produce alkanes. The enzyme found in this study can be applied to the biosynthetic pathway involving the formation of medium-chain aldehydes to produce alkanes and other valuable compounds.
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Stasiewicz KA, Jakubowska I, Moś JE, Marć P, Paczesny J, Zbonikowski R, Jaroszewicz LR. Optical Properties of a Tapered Optical Fiber Coated with Alkanes Doped with Fe 3O 4 Nanoparticles. Sensors (Basel) 2022; 22:s22207801. [PMID: 36298151 PMCID: PMC9609915 DOI: 10.3390/s22207801] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/07/2022] [Revised: 10/02/2022] [Accepted: 10/10/2022] [Indexed: 05/08/2023]
Abstract
The presented research shows the possibilities of creating in-line magnetic sensors based on the detection of changes of light propagation parameters, especially polarization, obtained by mixing Fe3O4 nanoparticles with hexadecane (higher alkane) surrounding a biconical optical fiber taper. The fiber optic taper allows to directly influence light parameters inside the taper without the necessity to lead the beam out of the structure. The mixture of hexadecane and Fe3O4 nanoparticles forms a special cladding surrounding a fiber taper which can be controlled by external factors such as the magnetic field. Described studies show changes of transmission (power, loss) and polarization properties like azimuth, and ellipticity, depending on the location of the mixture on sections of tapered optical fiber. The taper was made of a standard single-mode telecommunication fiber, stretched out to a length of 20.0 ± 0.5 mm and the diameter of the tapers is around 15.0 ± 0.3 μm, with the loss lower than 0.5 dB @ 1550 nm. Such a taper causes the beam to leak out of the waist structure and allows the addition of the external beam-controlling cladding material. The presented research can be used to build polarization switches or optical sensor. The results show that it can be a new way to control the propagation parameters of a light beam using tapered optical fiber and magnetic mixture.
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Affiliation(s)
- Karol A. Stasiewicz
- Faculty of Advanced Technologies and Chemistry, Military University of Technology, 2 Kaliskiego St., 00-908 Warsaw, Poland
- Correspondence:
| | - Iwona Jakubowska
- Faculty of Advanced Technologies and Chemistry, Military University of Technology, 2 Kaliskiego St., 00-908 Warsaw, Poland
| | - Joanna E. Moś
- Faculty of Advanced Technologies and Chemistry, Military University of Technology, 2 Kaliskiego St., 00-908 Warsaw, Poland
| | - Paweł Marć
- Faculty of Advanced Technologies and Chemistry, Military University of Technology, 2 Kaliskiego St., 00-908 Warsaw, Poland
| | - Jan Paczesny
- Institute of Physical Chemistry, Polish Academy of Sciences, Kasprzaka 44/52 St., 01-224 Warsaw, Poland
| | - Rafał Zbonikowski
- Institute of Physical Chemistry, Polish Academy of Sciences, Kasprzaka 44/52 St., 01-224 Warsaw, Poland
| | - Leszek R. Jaroszewicz
- Faculty of Advanced Technologies and Chemistry, Military University of Technology, 2 Kaliskiego St., 00-908 Warsaw, Poland
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Zhou Z, Xiao LH, Fei LL, Yu W, Lin M, Huang JJ, Zhang ZS, Tao J. [Characteristics and Source Apportionment of Volatile Organic Compounds (VOCs) in a Typical Industrial Area in Dongguan During Periods of Ozone and Non-ozone Pollution in Summer]. Huan Jing Ke Xue 2022; 43:4497-4505. [PMID: 36096590 DOI: 10.13227/j.hjkx.202111285] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 06/15/2023]
Abstract
To investigate the characteristics and sources of atmospheric volatile organic compounds (VOCs) in a typical industrial zone in Dongguan, 56 VOCs species were continuously measured in Houjie Town of Dongguan in summer of 2020. In addition, mass concentrations of O3, NOx, and CO and meteorological data were synchronously collected. Then, characteristics of total VOCs and major species, the contributions of major VOCs species to ozone formation potential (OFP), and source apportionment of VOCs under the different ozone concentrations were discussed. The mean mixing ratio of VOCs was 53.1×10-9 including aromatics (24.7×10-9), alkanes (23.7×10-9), alkenes (3.9×10-9), and alkynes (0.7×10-9). The mean mixing ratios of aromatics, alkanes, alkenes, and alkynes increased approximately 10%, 43%, 38%, and 98% during the period of ozone pollution, respectively, compared with those during the period of non-ozone pollution. Aromatics contributed the most to OFP during the periods of both ozone pollution and non-ozone pollution, followed by alkanes, alkenes, and alkynes. Solvent sources, liquefied petroleum gas (LPG) leakage, fossil fuel combustion, and hydrocarbon volatilization were resolved using the PMF model, which accounted for 60%±20%, 16%±11%, 15%±11%, and 9%±6% of total VOCs, respectively. During the period of ozone pollution, the contribution of solvent sources to the total VOCs decreased to 44%, whereas that of LPG leakage and hydrocarbon volatilization increased to 21% and 16%, respectively.
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Affiliation(s)
- Zhen Zhou
- Dongguan Ecology and Environment Monitoring Station of Guangdong Province, Dongguan 523009, China
| | - Lin-Hai Xiao
- Institute for Environmental and Climate Research, Jinan University, Guangzhou 511443, China
| | - Lei-Lei Fei
- South China Institute of Environmental Sciences, Ministry of Ecology and Environment, Guangzhou 510655, China
| | - Wei Yu
- Dongguan Ecology and Environment Monitoring Station of Guangdong Province, Dongguan 523009, China
| | - Man Lin
- Dongguan Ecology and Environment Monitoring Station of Guangdong Province, Dongguan 523009, China
| | - Jun-Jun Huang
- Institute for Environmental and Climate Research, Jinan University, Guangzhou 511443, China
| | - Zhi-Sheng Zhang
- South China Institute of Environmental Sciences, Ministry of Ecology and Environment, Guangzhou 510655, China
| | - Jun Tao
- Institute for Environmental and Climate Research, Jinan University, Guangzhou 511443, China
- South China Institute of Environmental Sciences, Ministry of Ecology and Environment, Guangzhou 510655, China
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10
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Moratti CF, Scott C, Coleman NV. Synthetic Biology Approaches to Hydrocarbon Biosensors: A Review. Front Bioeng Biotechnol 2022; 9:804234. [PMID: 35083206 PMCID: PMC8784404 DOI: 10.3389/fbioe.2021.804234] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/29/2021] [Accepted: 12/09/2021] [Indexed: 12/12/2022] Open
Abstract
Monooxygenases are a class of enzymes that facilitate the bacterial degradation of alkanes and alkenes. The regulatory components associated with monooxygenases are nature's own hydrocarbon sensors, and once functionally characterised, these components can be used to create rapid, inexpensive and sensitive biosensors for use in applications such as bioremediation and metabolic engineering. Many bacterial monooxygenases have been identified, yet the regulation of only a few of these have been investigated in detail. A wealth of genetic and functional diversity of regulatory enzymes and promoter elements still remains unexplored and unexploited, both in published genome sequences and in yet-to-be-cultured bacteria. In this review we examine in detail the current state of research on monooxygenase gene regulation, and on the development of transcription-factor-based microbial biosensors for detection of alkanes and alkenes. A new framework for the systematic characterisation of the underlying genetic components and for further development of biosensors is presented, and we identify focus areas that should be targeted to enable progression of more biosensor candidates to commercialisation and deployment in industry and in the environment.
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Affiliation(s)
- Claudia F. Moratti
- School of Life and Environmental Science, Faculty of Science, University of Sydney, Sydney, NSW, Australia
- CSIRO Synthetic Biology Future Science Platform, Canberra, ACT, Australia
| | - Colin Scott
- CSIRO Synthetic Biology Future Science Platform, Canberra, ACT, Australia
| | - Nicholas V. Coleman
- School of Life and Environmental Science, Faculty of Science, University of Sydney, Sydney, NSW, Australia
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11
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Matsubara H, Mori R, Ohtomi E. Nucleation of Surfactant- Alkane Mixed Solid Monolayer and Bilayer Domains at the Air-Water Interface. Materials (Basel) 2022; 15:485. [PMID: 35057203 DOI: 10.3390/ma15020485] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 12/14/2021] [Revised: 01/04/2022] [Accepted: 01/06/2022] [Indexed: 01/27/2023]
Abstract
We investigated the wetting transitions of tetradecane and hexadecane droplets in dodecyltrimethylammonium bromide (C12TAB), tetradecyltrimethylammonium bromide (C14TAB), and hexadecyltrimethylammonium bromide (C16TAB) aqueous solutions. By varying the surfactant concentration, the formation of mixed monolayers of a surfactant and an alkane was observed at the air–water interface. Depending on the combination of surfactant and alkane, these wetting monolayers underwent another thermal phase transition upon cooling either to a frozen mixed monolayer (S1) or a bilayer structure composed of a solid monolayer of a pure alkane rested on a liquid-like mixed monolayer (S2). Based on the phase diagrams determined by phase modulation ellipsometry, the difference in the morphology of the nucleated S1 and S2 phase domains was also investigated using Brewster angle microscopy. Domains of the S1 phase were relatively small and highly branched, whereas those of the S2 phase were large and circular. The difference in domain morphology was explained by the competition of the domain line tension and electrostatic dipole interactions between surfactant molecules in the domains.
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12
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Vuorio E, Thiel K, Fitzpatrick D, Huokko T, Kämäräinen J, Dandapani H, Aro EM, Kallio P. Hydrocarbon Desaturation in Cyanobacterial Thylakoid Membranes Is Linked With Acclimation to Suboptimal Growth Temperatures. Front Microbiol 2021; 12:781864. [PMID: 34899663 PMCID: PMC8661006 DOI: 10.3389/fmicb.2021.781864] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/23/2021] [Accepted: 10/26/2021] [Indexed: 11/28/2022] Open
Abstract
The ability to produce medium chain length aliphatic hydrocarbons is strictly conserved in all photosynthetic cyanobacteria, but the molecular function and biological significance of these compounds still remain poorly understood. This study gives a detailed view to the changes in intracellular hydrocarbon chain saturation in response to different growth temperatures and osmotic stress, and the associated physiological effects in the model cyanobacterium Synechocystis sp. PCC 6803. We show that the ratio between the representative hydrocarbons, saturated heptadecane and desaturated heptadecene, is reduced upon transition from 38°C toward 15°C, while the total content is not much altered. In parallel, it appears that in the hydrocarbon-deficient ∆ado (aldehyde deformylating oxygenase) mutant, phenotypic and metabolic changes become more evident under suboptimal temperatures. These include hindered growth, accumulation of polyhydroxybutyrate, altered pigment profile, restricted phycobilisome movement, and ultimately reduced CO2 uptake and oxygen evolution in the ∆ado strain as compared to Synechocystis wild type. The hydrocarbons are present in relatively low amounts and expected to interact with other nonpolar cellular components, including the hydrophobic part of the membrane lipids. We hypothesize that the function of the aliphatic chains is specifically associated with local fluidity effects of the thylakoid membrane, which may be required for the optimal movement of the integral components of the photosynthetic machinery. The findings support earlier studies and expand our understanding of the biological role of aliphatic hydrocarbons in acclimation to low temperature in cyanobacteria and link the proposed role in the thylakoid membrane to changes in photosynthetic performance, central carbon metabolism, and cell growth, which need to be effectively fine-tuned under alternating conditions in nature.
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Affiliation(s)
| | | | | | | | | | | | - Eva-Mari Aro
- Molecular Plant Biology, Department of Life Technologies, University of Turku, Turku, Finland
| | - Pauli Kallio
- Molecular Plant Biology, Department of Life Technologies, University of Turku, Turku, Finland
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13
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Li X, Liang Y, Li K, Jin P, Tang J, Klepacz-Smółka A, Ledakowicz S, Daroch M. Effects of Low Temperature, Nitrogen Starvation and Their Combination on the Photosynthesis and Metabolites of Thermosynechococcus E542: A Comparison Study. Plants (Basel) 2021; 10:plants10102101. [PMID: 34685910 PMCID: PMC8537721 DOI: 10.3390/plants10102101] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 09/09/2021] [Revised: 09/26/2021] [Accepted: 09/27/2021] [Indexed: 11/25/2022]
Abstract
Both low temperature and nitrogen starvation caused chlorosis of cyanobacteria. Here, in this study, for the first time, we compared the effects of low temperature, nitrogen starvation, and their combination on the photosynthesis and metabolites of a thermophilic cyanobacterium strain, Thermosynechococcus E542. Under various culture conditions, the growth rates, pigment contents, and chlorophyll fluorescence were monitored, and the composition of alkanes, lipidomes, and carbohydrates were determined. It was found that low temperature (35 °C) significantly suppressed the growth of Thermosynechococcus E542. Nitrogen starvation at 45 °C and 55 °C did not affect the growth; however, combined treatment of low temperature and nitrogen starvation led to the lowest growth rate and biomass productivity. Both low temperature and nitrogen starvation caused significantly declined contents of pigments, but they resulted in a different effect on the OJIP curves, and their combination led to the lowest pigment contents. The composition of fatty acids and alkanes was altered upon low-temperature cultivation, while nitrogen starvation caused reduced contents of all lipids. The low temperature did not affect carbohydrate contents, while nitrogen starvation greatly enhanced carbohydrate content, and their combination did not enhance carbohydrate content, but led to reduced productivity. These results revealed the influence of low temperature, nitrogen starvation, and their combined treatment for the accumulation of phycobiliproteins, lipids, and carbohydrates of a thermophilic cyanobacterium strain, Thermosynechococcus E542.
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Affiliation(s)
- Xingkang Li
- School of Environment and Energy, Peking University Shenzhen Graduate School, Shenzhen 518055, China; (X.L.); (Y.L.); (K.L.); (P.J.)
- Department School of Liquor and Food Engineering, Guizhou University, Guiyang 550025, China
| | - Yuanmei Liang
- School of Environment and Energy, Peking University Shenzhen Graduate School, Shenzhen 518055, China; (X.L.); (Y.L.); (K.L.); (P.J.)
| | - Kai Li
- School of Environment and Energy, Peking University Shenzhen Graduate School, Shenzhen 518055, China; (X.L.); (Y.L.); (K.L.); (P.J.)
| | - Peng Jin
- School of Environment and Energy, Peking University Shenzhen Graduate School, Shenzhen 518055, China; (X.L.); (Y.L.); (K.L.); (P.J.)
| | - Jie Tang
- School of Food and Bioengineering, Chengdu University, Chengdu 610106, China;
| | - Anna Klepacz-Smółka
- Department of Bioprocess Engineering, Faculty of Process and Environmental Engineering, Lodz University of Technology, ul. Wolczanska 213, 90-924 Lodz, Poland; (A.K.-S.); (S.L.)
| | - Stanislaw Ledakowicz
- Department of Bioprocess Engineering, Faculty of Process and Environmental Engineering, Lodz University of Technology, ul. Wolczanska 213, 90-924 Lodz, Poland; (A.K.-S.); (S.L.)
| | - Maurycy Daroch
- School of Environment and Energy, Peking University Shenzhen Graduate School, Shenzhen 518055, China; (X.L.); (Y.L.); (K.L.); (P.J.)
- Correspondence: ; Tel.: +86-0755-26032184
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14
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Carrillo JC, Danneels D, Woldhuis J. Relevance of animal studies in the toxicological assessment of oil and wax hydrocarbons. Solving the puzzle for a new outlook in risk assessment. Crit Rev Toxicol 2021; 51:418-455. [PMID: 34494504 DOI: 10.1080/10408444.2021.1944056] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
Abstract
Paraffin waxes and white mineral oils are distinct petroleum products separated from a common feedstock by crystallization, where only n-alkanes, iso- and cyclo-alkanes with a linear backbone of ∼ 20 carbon atoms long, selectively crystalize out from the oil to form the wax, which is solid at room temperature, whereas oils remain liquid. Up until the 90's, these differences were reflected in separated regulatory assessments. A paradigm shift occurred when Fischer 344 rats (F-344) developed liver epithelioid granuloma following exposure to low and medium viscosity oils or waxes. This lesion was used as common denominator between these products to be jointly assessed under the common term "mineral hydrocarbons - MHC", obviating compositional differences. This regulatory paradigm dominated for the next 30 years, exacerbated by the EFSA 2012 evaluation using the analytical term "MOSH" (mineral oil saturated hydrocarbons) which encompassed these products under single chromatography fraction. The reconstruction of historical developments, together with recent EFSA-sponsored studies of toxicity and accumulation and supporting literature, has allowed us to understand the etiology of the F-344 rat hepatic epithelioid granuloma, which is presented in an adverse outcome pathway (AOP). Considering chemical composition, it clearly demonstrates that the hepatic effects in F-344 rats caused by linear alkanes of waxes are irrelevant for humans. Waxes are thus not MOSH and should thus be evaluated on their own merit. The term MOSH should not include n-alkanes and be exclusively used to mineral oil fractions when considering their chemical makeup for a relevant human hazard assessment.
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15
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Li J, Lear MJ, Hayashi Y. Direct Cyclopropanation of α-Cyano β-Aryl Alkanes by Light-Mediated Single Electron Transfer Between Donor-Acceptor Pairs. Chemistry 2021; 27:5901-5905. [PMID: 33565170 DOI: 10.1002/chem.202100341] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/30/2021] [Revised: 02/08/2021] [Indexed: 12/21/2022]
Abstract
Cyclopropanes are traditionally prepared by the formal [2+1] addition of carbene or radical based C1 units to alkenes. In contrast, the one-pot intermolecular cyclopropanation of alkanes by redox active C1 units has remained unrealised. Herein, we achieved this process simply by exposing β-aryl propionitriles and C1 radical precursors (N-oxy esters) to base and blue light. The overall process is redox-neutral and a photocatalyst, whether metal- or organic-based, is not required. Our findings support that single electron transfer (SET) from the α-cyano carbanion of the propionitrile to the N-oxy ester is facilitated by blue-light via their electron donor-acceptor (EDA) complex. The α-cyano carbon radical thus formed can then lose a β-proton to form a π-resonance stabilised radical anion that preferentially couples at the benzylic β-position with a decarboxylated C1 radical unit. This new transition metal-free chemistry tolerates both electron rich and electron deficient (hetero)aryl systems, even sulfide or alkene functionality, to afford a range of cis-aryl/cyano cyclopropanes bearing congested tetrasubstituted quaternary carbons.
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Affiliation(s)
- Jing Li
- Department of Chemistry, Graduate School of Science, Tohoku University, Aza-Aoba, Aoba-ku, Sendai, 980-8578, Japan
| | - Martin J Lear
- School of Chemistry, University of Lincoln, Brayford Pool, Lincoln, LN6 7TS, UK
| | - Yujiro Hayashi
- Department of Chemistry, Graduate School of Science, Tohoku University, Aza-Aoba, Aoba-ku, Sendai, 980-8578, Japan
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16
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Takabatake M, Hashimoto A, Chun WJ, Nambo M, Manaka Y, Motokura K. Dehydrogenative Coupling of Alkanes and Benzene Enhanced by Slurry-Phase Interparticle Hydrogen Transfer. JACS Au 2021; 1:124-129. [PMID: 34467277 PMCID: PMC8395707 DOI: 10.1021/jacsau.0c00070] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Indexed: 06/13/2023]
Abstract
The dehydrogenative coupling reaction of alkanes and benzene has attracted attention as a method of direct conversion of alkanes to raw materials for useful chemical products. Here, we report the first combined catalyst system composed of hydrotalcite-supported palladium and solid acid aluminum-exchanged montmorillonite for the direct alkylation of benzene promoted by slurry-phase interparticle hydrogen transfer at 150 °C. The combination of the two catalytic particles showed excellent activity and achieved the maximum benzene conversion of 21% and target product selectivity of 84% in the reaction of n-heptane and benzene. Our results, thus, provide a feasible strategy to design efficient liquid-phase reaction systems employing simple physical mixing of two catalytic particles.
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Affiliation(s)
- Moe Takabatake
- Department
of Chemical Science and Engineering, School of Materials and Chemical
Technology, Tokyo Institute of Technology, Yokohama 226-8502, Japan
| | - Ayako Hashimoto
- In-situ
Characterization Technique Development Group, National Institute for Materials Science, Tsukuba 305-0047, Japan
- PRESTO, Japan Science and Technology
Agency (JST), Saitama 332-0012, Japan
| | - Wang-Jae Chun
- Graduate
School of Arts and Sciences, International
Christian University, Tokyo 181-8585, Japan
| | - Masayuki Nambo
- Department
of Chemical Science and Engineering, School of Materials and Chemical
Technology, Tokyo Institute of Technology, Yokohama 226-8502, Japan
| | - Yuichi Manaka
- Department
of Chemical Science and Engineering, School of Materials and Chemical
Technology, Tokyo Institute of Technology, Yokohama 226-8502, Japan
- Renewable
Energy Research Center, National Institute
of Advanced Industrial Science and Technology (AIST), Fukushima 963-0298, Japan
| | - Ken Motokura
- Department
of Chemical Science and Engineering, School of Materials and Chemical
Technology, Tokyo Institute of Technology, Yokohama 226-8502, Japan
- PRESTO, Japan Science and Technology
Agency (JST), Saitama 332-0012, Japan
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17
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Rahman T, Shao M, Pahari S, Venglat P, Soolanayakanahally R, Qiu X, Rahman A, Tanino K. Dissecting the Roles of Cuticular Wax in Plant Resistance to Shoot Dehydration and Low-Temperature Stress in Arabidopsis. Int J Mol Sci 2021; 22:1554. [PMID: 33557073 DOI: 10.3390/ijms22041554] [Citation(s) in RCA: 18] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/14/2021] [Revised: 01/29/2021] [Accepted: 01/29/2021] [Indexed: 12/30/2022] Open
Abstract
Cuticular waxes are a mixture of hydrophobic very-long-chain fatty acids and their derivatives accumulated in the plant cuticle. Most studies define the role of cuticular wax largely based on reducing nonstomatal water loss. The present study investigated the role of cuticular wax in reducing both low-temperature and dehydration stress in plants using Arabidopsis thaliana mutants and transgenic genotypes altered in the formation of cuticular wax. cer3-6, a known Arabidopsis wax-deficient mutant (with distinct reduction in aldehydes, n-alkanes, secondary n-alcohols, and ketones compared to wild type (WT)), was most sensitive to water loss, while dewax, a known wax overproducer (greater alkanes and ketones compared to WT), was more resistant to dehydration compared to WT. Furthermore, cold-acclimated cer3-6 froze at warmer temperatures, while cold-acclimated dewax displayed freezing exotherms at colder temperatures compared to WT. Gas Chromatography-Mass Spectroscopy (GC-MS) analysis identified a characteristic decrease in the accumulation of certain waxes (e.g., alkanes, alcohols) in Arabidopsis cuticles under cold acclimation, which was additionally reduced in cer3-6. Conversely, the dewax mutant showed a greater ability to accumulate waxes under cold acclimation. Fourier Transform Infrared Spectroscopy (FTIR) also supported observations in cuticular wax deposition under cold acclimation. Our data indicate cuticular alkane waxes along with alcohols and fatty acids can facilitate avoidance of both ice formation and leaf water loss under dehydration stress and are promising genetic targets of interest.
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18
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Daszkowska-Golec A. Degrade or Silence? - RNA Turnover Takes Control of Epicuticular Wax Synthesis. Trends Plant Sci 2020; 25:950-952. [PMID: 32646720 DOI: 10.1016/j.tplants.2020.06.009] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/01/2020] [Revised: 06/15/2020] [Accepted: 06/24/2020] [Indexed: 05/19/2023]
Abstract
Epicuticular waxes serve as a protective layer on plant aerial surfaces. The chemical reactions of wax biosynthesis are well understood, but little is known about the underlying regulatory mechanisms. New data from Yang et al. and Lange et al. argue that RNA degradation and silencing play a key role in regulating the content of alkanes, the most abundant components of wax.
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Affiliation(s)
- Agata Daszkowska-Golec
- Institute of Biology, Biotechnology, and Environmental Protection, Faculty of Natural Sciences, University of Silesia in Katowice, Jagiellońska 28, 40-032 Katowice, Poland.
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19
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Arias DB, Gomez Pinto KA, Cooper KK, Summers ML. Transcriptomic analysis of cyanobacterial alkane overproduction reveals stress-related genes and inhibitors of lipid droplet formation. Microb Genom 2020; 6. [PMID: 32941127 PMCID: PMC7660261 DOI: 10.1099/mgen.0.000432] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/30/2022] Open
Abstract
The cyanobacterium Nostoc punctiforme can form lipid droplets (LDs), internal inclusions containing triacylglycerols, carotenoids and alkanes. LDs are enriched for a 17 carbon-long alkane in N. punctiforme, and it has been shown that the overexpression of the aar and ado genes results in increased LD and alkane production. To identify transcriptional adaptations associated with increased alkane production, we performed comparative transcriptomic analysis of an alkane overproduction strain. RNA-seq data identified a large number of highly upregulated genes in the overproduction strain, including genes potentially involved in rRNA processing, mycosporine-glycine production and synthesis of non-ribosomal peptides, including nostopeptolide A. Other genes encoding helical carotenoid proteins, stress-induced proteins and those for microviridin synthesis were also upregulated. Construction of N. punctiforme strains with several upregulated genes or operons on multi-copy plasmids resulted in reduced alkane accumulation, indicating possible negative regulators of alkane production. A strain containing four genes for microviridin biosynthesis completely lost the ability to synthesize LDs. This strain exhibited wild-type growth and lag phase recovery under standard conditions, and slightly faster growth under high light. The transcriptional changes associated with increased alkane production identified in this work will provide the basis for future experiments designed to use cyanobacteria as a production platform for biofuel or high-value hydrophobic products.
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Affiliation(s)
- Daisy B. Arias
- California State University Northridge, 18111 Nordhoff St, Northridge, CA 91330, USA
| | - Kevin A. Gomez Pinto
- California State University Northridge, 18111 Nordhoff St, Northridge, CA 91330, USA
| | - Kerry K. Cooper
- University of Arizona, 1117 E. Lowell St, Tucson, AZ 85721, USA
| | - Michael L. Summers
- California State University Northridge, 18111 Nordhoff St, Northridge, CA 91330, USA
- *Correspondence: Michael L. Summers,
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20
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Du R, Zhang A, Du Z, Zhang X. Molecular Dynamics Simulation on Thin-Film Lubrication of a Mixture of Three Alkanes. Materials (Basel) 2020; 13:ma13173689. [PMID: 32825490 PMCID: PMC7504465 DOI: 10.3390/ma13173689] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 07/24/2020] [Revised: 08/12/2020] [Accepted: 08/18/2020] [Indexed: 06/11/2023]
Abstract
We used the COMPASS forcefield to perform molecular dynamics (MD) simulation of a mixture composed of three alkanes as the lubricant for the thin-film lubrication. The viscosity of the lubrication film in the non-working state, the final film thickness, and density distribution were investigated. The results reveal that the viscosity error among different initial film thicknesses in the non-working state is within 5%, which confirms the applicability of the model and the forcefield. The viscosity decreases oscillating as temperature increases. Whatever the initial film thickness is, the film thickness change rate with respect to pressure load is almost the same. When pressure increases, the density peaks increase. As the initial film thickness increases, the normalized thicknesses of adsorption and ordered layers decrease. In nanoscale, the density predicted by the MD simulation is higher than the prediction of the Tait equation, even if the adsorption layers is excluded.
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Affiliation(s)
- Run Du
- School of Mechanical Engineering, Southwest Jiaotong University, Chengdu 610031, China; (A.Z.); (Z.D.); (X.Z.)
- Technology and Equipment of Rail Transit Operation and Maintenance Key Laboratory of Sichuan Province, Chengdu 610031, China
| | - Anying Zhang
- School of Mechanical Engineering, Southwest Jiaotong University, Chengdu 610031, China; (A.Z.); (Z.D.); (X.Z.)
- Technology and Equipment of Rail Transit Operation and Maintenance Key Laboratory of Sichuan Province, Chengdu 610031, China
| | - Zhihua Du
- School of Mechanical Engineering, Southwest Jiaotong University, Chengdu 610031, China; (A.Z.); (Z.D.); (X.Z.)
- Technology and Equipment of Rail Transit Operation and Maintenance Key Laboratory of Sichuan Province, Chengdu 610031, China
| | - Xiaoyu Zhang
- School of Mechanical Engineering, Southwest Jiaotong University, Chengdu 610031, China; (A.Z.); (Z.D.); (X.Z.)
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21
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Kinyok MJ, Wilhelm A, Kamto ELD, Ngo Mbing J, Bonnet SL, Pegnyemb DE. Chemical constituents of the leaves of Anthonotha macrophylla (Leguminosae). Nat Prod Res 2020; 35:3865-3872. [PMID: 32212868 DOI: 10.1080/14786419.2020.1744144] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
Abstract
The present study deals with the isolation and the characterization of the chemical constituents from the leaves of Anthonotha macrophylla (Leguminosae). Using various chromatographic techniques (TLC, CC, HPLC), the methanolic extract of the leaves of Anthonotha macrophylla yielded one new alkaloid (1) as well as six known compounds amongst which an alkane (2), isolated for the first time from a natural product, an ester of fatty acid (3), two isocoumarines (4-5), a sterol (6) and a disaccharide (7). Their structures were elucidated using spectroscopic technics including extensive 1-D and 2-D NMR, HR-SM experiments.
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Affiliation(s)
- Mc Jesus Kinyok
- Department of Chemistry, Higher Teachers Training College, University of Yaounde I, Yaounde, Cameroon.,Department of Organic Chemistry, Faculty of Science, University of Yaounde I, Yaounde, Cameroon
| | - Anke Wilhelm
- Faculty of Natural and agricultural sciences, Department of Chemistry, University of the Free State, Bloemfontein, South Africa
| | - Eutrophe Le Doux Kamto
- Department of Organic Chemistry, Faculty of Science, University of Yaounde I, Yaounde, Cameroon
| | - Joséphine Ngo Mbing
- Department of Organic Chemistry, Faculty of Science, University of Yaounde I, Yaounde, Cameroon.,Centre de Recherche en Plantes Médicinales et Médecine Traditionnelle (CRPMT), I.M.P.M, Yaoundé, Cameroun
| | - Susanna L Bonnet
- Faculty of Natural and agricultural sciences, Department of Chemistry, University of the Free State, Bloemfontein, South Africa
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22
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Shakeel T, Sharma A, Yazdani SS. Building cell factories for the production of advanced fuels. Biochem Soc Trans 2019; 47:1701-14. [PMID: 31803925 DOI: 10.1042/BST20190168] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/18/2019] [Revised: 11/13/2019] [Accepted: 11/15/2019] [Indexed: 12/31/2022]
Abstract
Synthetic biology-based engineering strategies are being extensively employed for microbial production of advanced fuels. Advanced fuels, being comparable in energy efficiency and properties to conventional fuels, have been increasingly explored as they can be directly incorporated into the current fuel infrastructure without the need for reconstructing the pre-existing set-up rendering them economically viable. Multiple metabolic engineering approaches have been used for rewiring microbes to improve existing or develop newly programmed cells capable of efficient fuel production. The primary challenge in using these approaches is improving the product yield for the feasibility of the commercial processes. Some of the common roadblocks towards enhanced fuel production include - limited availability of flux towards precursors and desired pathways due to presence of competing pathways, limited cofactor and energy supply in cells, the low catalytic activity of pathway enzymes, obstructed product transport, and poor tolerance of host cells for end products. Consequently, despite extensive studies on the engineering of microbial hosts, the costs of industrial-scale production of most of these heterologously produced fuel compounds are still too high. Though considerable progress has been made towards successfully producing some of these biofuels, a substantial amount of work needs to be done for improving the titers of others. In this review, we have summarized the different engineering strategies that have been successfully used for engineering pathways into commercial hosts for the production of advanced fuels and different approaches implemented for tuning host strains and pathway enzymes for scaling up production levels.
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23
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Raman N, Maisel S, Grabau M, Taccardi N, Debuschewitz J, Wolf M, Wittkämper H, Bauer T, Wu M, Haumann M, Papp C, Görling A, Spiecker E, Libuda J, Steinrück HP, Wasserscheid P. Highly Effective Propane Dehydrogenation Using Ga-Rh Supported Catalytically Active Liquid Metal Solutions. ACS Catal 2019; 9:9499-9507. [PMID: 32219008 PMCID: PMC7088128 DOI: 10.1021/acscatal.9b02459] [Citation(s) in RCA: 53] [Impact Index Per Article: 10.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/12/2019] [Revised: 08/26/2019] [Indexed: 11/28/2022]
Abstract
Our contribution demonstrates that rhodium, an element that has barely been reported as an active metal for selective dehydrogenation of alkanes becomes a very active, selective, and robust dehydrogenation catalyst when exposed to propane in the form of single atoms at the interface of a solid-supported, highly dynamic liquid Ga-Rh mixture. We demonstrate that the transition to a fully liquid supported alloy droplet at Ga/Rh ratios above 80, results in a drastic increase in catalyst activity with high propylene selectivity. The combining results from catalytic studies, X-ray photoelectron spectroscopy, IR-spectroscopy under reaction conditions, microscopy, and density-functional theory calculations, we obtained a comprehensive microscopy picture of the working principle of the Ga-Rh supported catalytically active liquid metal solution.
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Affiliation(s)
- Narayanan Raman
- Lehrstuhl
für Chemische Reaktionstechnik (CRT), Lehrstuhl für
Theoretische Chemie, Lehrstuhl für Physikalische Chemie II, and Lehrstuhl für Katalytische
Grenzflächenforschung, Friedrich-Alexander-Universität
Erlangen-Nürnberg (FAU), Egerlandstr. 3, 91058 Erlangen, Germany
| | - Sven Maisel
- Lehrstuhl
für Chemische Reaktionstechnik (CRT), Lehrstuhl für
Theoretische Chemie, Lehrstuhl für Physikalische Chemie II, and Lehrstuhl für Katalytische
Grenzflächenforschung, Friedrich-Alexander-Universität
Erlangen-Nürnberg (FAU), Egerlandstr. 3, 91058 Erlangen, Germany
| | - Mathias Grabau
- Lehrstuhl
für Chemische Reaktionstechnik (CRT), Lehrstuhl für
Theoretische Chemie, Lehrstuhl für Physikalische Chemie II, and Lehrstuhl für Katalytische
Grenzflächenforschung, Friedrich-Alexander-Universität
Erlangen-Nürnberg (FAU), Egerlandstr. 3, 91058 Erlangen, Germany
| | - Nicola Taccardi
- Lehrstuhl
für Chemische Reaktionstechnik (CRT), Lehrstuhl für
Theoretische Chemie, Lehrstuhl für Physikalische Chemie II, and Lehrstuhl für Katalytische
Grenzflächenforschung, Friedrich-Alexander-Universität
Erlangen-Nürnberg (FAU), Egerlandstr. 3, 91058 Erlangen, Germany
| | - Jonas Debuschewitz
- Lehrstuhl
für Chemische Reaktionstechnik (CRT), Lehrstuhl für
Theoretische Chemie, Lehrstuhl für Physikalische Chemie II, and Lehrstuhl für Katalytische
Grenzflächenforschung, Friedrich-Alexander-Universität
Erlangen-Nürnberg (FAU), Egerlandstr. 3, 91058 Erlangen, Germany
| | - Moritz Wolf
- Lehrstuhl
für Chemische Reaktionstechnik (CRT), Lehrstuhl für
Theoretische Chemie, Lehrstuhl für Physikalische Chemie II, and Lehrstuhl für Katalytische
Grenzflächenforschung, Friedrich-Alexander-Universität
Erlangen-Nürnberg (FAU), Egerlandstr. 3, 91058 Erlangen, Germany
| | - Haiko Wittkämper
- Lehrstuhl
für Chemische Reaktionstechnik (CRT), Lehrstuhl für
Theoretische Chemie, Lehrstuhl für Physikalische Chemie II, and Lehrstuhl für Katalytische
Grenzflächenforschung, Friedrich-Alexander-Universität
Erlangen-Nürnberg (FAU), Egerlandstr. 3, 91058 Erlangen, Germany
| | - Tanja Bauer
- Lehrstuhl
für Chemische Reaktionstechnik (CRT), Lehrstuhl für
Theoretische Chemie, Lehrstuhl für Physikalische Chemie II, and Lehrstuhl für Katalytische
Grenzflächenforschung, Friedrich-Alexander-Universität
Erlangen-Nürnberg (FAU), Egerlandstr. 3, 91058 Erlangen, Germany
| | - Mingjian Wu
- Lehrstuhl
für Werkstoffwissenschaften, Mikro- und Nanostrukturforschung, Friedrich-Alexander-Universität Erlangen-Nürnberg
(FAU), Cauerstr. 6, 91058 Erlangen, Germany
| | - Marco Haumann
- Lehrstuhl
für Chemische Reaktionstechnik (CRT), Lehrstuhl für
Theoretische Chemie, Lehrstuhl für Physikalische Chemie II, and Lehrstuhl für Katalytische
Grenzflächenforschung, Friedrich-Alexander-Universität
Erlangen-Nürnberg (FAU), Egerlandstr. 3, 91058 Erlangen, Germany
| | - Christian Papp
- Lehrstuhl
für Chemische Reaktionstechnik (CRT), Lehrstuhl für
Theoretische Chemie, Lehrstuhl für Physikalische Chemie II, and Lehrstuhl für Katalytische
Grenzflächenforschung, Friedrich-Alexander-Universität
Erlangen-Nürnberg (FAU), Egerlandstr. 3, 91058 Erlangen, Germany
| | - Andreas Görling
- Lehrstuhl
für Chemische Reaktionstechnik (CRT), Lehrstuhl für
Theoretische Chemie, Lehrstuhl für Physikalische Chemie II, and Lehrstuhl für Katalytische
Grenzflächenforschung, Friedrich-Alexander-Universität
Erlangen-Nürnberg (FAU), Egerlandstr. 3, 91058 Erlangen, Germany
| | - Erdmann Spiecker
- Lehrstuhl
für Werkstoffwissenschaften, Mikro- und Nanostrukturforschung, Friedrich-Alexander-Universität Erlangen-Nürnberg
(FAU), Cauerstr. 6, 91058 Erlangen, Germany
| | - Jörg Libuda
- Lehrstuhl
für Chemische Reaktionstechnik (CRT), Lehrstuhl für
Theoretische Chemie, Lehrstuhl für Physikalische Chemie II, and Lehrstuhl für Katalytische
Grenzflächenforschung, Friedrich-Alexander-Universität
Erlangen-Nürnberg (FAU), Egerlandstr. 3, 91058 Erlangen, Germany
| | - Hans-Peter Steinrück
- Lehrstuhl
für Chemische Reaktionstechnik (CRT), Lehrstuhl für
Theoretische Chemie, Lehrstuhl für Physikalische Chemie II, and Lehrstuhl für Katalytische
Grenzflächenforschung, Friedrich-Alexander-Universität
Erlangen-Nürnberg (FAU), Egerlandstr. 3, 91058 Erlangen, Germany
| | - Peter Wasserscheid
- Lehrstuhl
für Chemische Reaktionstechnik (CRT), Lehrstuhl für
Theoretische Chemie, Lehrstuhl für Physikalische Chemie II, and Lehrstuhl für Katalytische
Grenzflächenforschung, Friedrich-Alexander-Universität
Erlangen-Nürnberg (FAU), Egerlandstr. 3, 91058 Erlangen, Germany
- Forschungszentrum
Jülich, “Helmholtz-Institute
Erlangen-Nürnberg for Renewable Energies” (IEK 11), Egerlandstr. 3, 91058 Erlangen, Germany
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24
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Jaroensuk J, Intasian P, Kiattisewee C, Munkajohnpon P, Chunthaboon P, Buttranon S, Trisrivirat D, Wongnate T, Maenpuen S, Tinikul R, Chaiyen P. Addition of formate dehydrogenase increases the production of renewable alkane from an engineered metabolic pathway. J Biol Chem 2019; 294:11536-11548. [PMID: 31182484 DOI: 10.1074/jbc.ra119.008246] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/01/2019] [Revised: 06/08/2019] [Indexed: 11/06/2022] Open
Abstract
An engineered metabolic pathway consisting of reactions that convert fatty acids to aldehydes and eventually alkanes would provide a means to produce biofuels from renewable energy sources. The enzyme aldehyde-deformylating oxygenase (ADO) catalyzes the conversion of aldehydes and oxygen to alkanes and formic acid and uses oxygen and a cellular reductant such as ferredoxin (Fd) as co-substrates. In this report, we aimed to increase ADO-mediated alkane production by converting an unused by-product, formate, to a reductant that can be used by ADO. We achieved this by including the gene (fdh), encoding formate dehydrogenase from Xanthobacter sp. 91 (XaFDH), into a metabolic pathway expressed in Escherichia coli Using this approach, we could increase bacterial alkane production, resulting in a conversion yield of ∼50%, the highest yield reported to date. Measuring intracellular nicotinamide concentrations, we found that E. coli cells harboring XaFDH have a significantly higher concentration of NADH and a higher NADH/NAD+ ratio than E. coli cells lacking XaFDH. In vitro analysis disclosed that ferredoxin (flavodoxin):NADP+ oxidoreductase could use NADH to reduce Fd and thus facilitate ADO-mediated alkane production. As formic acid can decrease the cellular pH, the addition of formate dehydrogenase could also maintain the cellular pH in the neutral range, which is more suitable for alkane production. We conclude that this simple, dual-pronged approach of increasing NAD(P)H and removing extra formic acid is efficient for increasing the production of renewable alkanes via synthetic biology-based approaches.
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Affiliation(s)
- Juthamas Jaroensuk
- School of Biomolecular Science and Engineering, Vidyasirimedhi Institute of Science and Technology (VISTEC), Wangchan Valley, Rayong 21210, Thailand
| | - Pattarawan Intasian
- School of Biomolecular Science and Engineering, Vidyasirimedhi Institute of Science and Technology (VISTEC), Wangchan Valley, Rayong 21210, Thailand
| | - Cholpisit Kiattisewee
- School of Biomolecular Science and Engineering, Vidyasirimedhi Institute of Science and Technology (VISTEC), Wangchan Valley, Rayong 21210, Thailand
| | - Pobthum Munkajohnpon
- School of Biomolecular Science and Engineering, Vidyasirimedhi Institute of Science and Technology (VISTEC), Wangchan Valley, Rayong 21210, Thailand.,Department of Biochemistry and Center for Excellence in Protein and Enzyme Technology, Faculty of Science, Mahidol University, Bangkok 14000, Thailand
| | - Paweenapon Chunthaboon
- Department of Biochemistry and Center for Excellence in Protein and Enzyme Technology, Faculty of Science, Mahidol University, Bangkok 14000, Thailand
| | - Supacha Buttranon
- School of Biomolecular Science and Engineering, Vidyasirimedhi Institute of Science and Technology (VISTEC), Wangchan Valley, Rayong 21210, Thailand
| | - Duangthip Trisrivirat
- Department of Biochemistry and Center for Excellence in Protein and Enzyme Technology, Faculty of Science, Mahidol University, Bangkok 14000, Thailand
| | - Thanyaporn Wongnate
- School of Biomolecular Science and Engineering, Vidyasirimedhi Institute of Science and Technology (VISTEC), Wangchan Valley, Rayong 21210, Thailand
| | - Somchart Maenpuen
- Department of Biochemistry, Faculty of Science, Burapha University, Chonburi 20131, Thailand
| | - Ruchanok Tinikul
- Department of Biochemistry and Center for Excellence in Protein and Enzyme Technology, Faculty of Science, Mahidol University, Bangkok 14000, Thailand
| | - Pimchai Chaiyen
- School of Biomolecular Science and Engineering, Vidyasirimedhi Institute of Science and Technology (VISTEC), Wangchan Valley, Rayong 21210, Thailand
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25
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Sutradhar M, Barman TR, Pombeiro AJL, Martins LMDRS. Catalytic Activity of Polynuclear vs. Dinuclear Aroylhydrazone Cu(II) Complexes in Microwave-Assisted Oxidation of Neat Aliphatic and Aromatic Hydrocarbons. Molecules 2018; 24:molecules24010047. [PMID: 30583583 PMCID: PMC6337553 DOI: 10.3390/molecules24010047] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/28/2018] [Revised: 12/16/2018] [Accepted: 12/21/2018] [Indexed: 11/16/2022] Open
Abstract
One-dimensional (1D) polynuclear Cu(II) complex (1) derived from (5-bromo-2-hydroxybenzylidene)-2-hydroxybenzohydrazide (H₂L) is synthesized and characterized by elemental analysis, IR spectroscopy, ESI-MS, and single crystal X-ray crystallography. Its catalytic performance towards the solvent-free microwave-assisted peroxidative oxidation of aliphatic and aromatic hydrocarbons under mild conditions is compared with that of dinuclear Cu(II) complexes (2 and 3) of the same ligand, previously reported as antiproliferative agents. Polymer 1 exhibits the highest activity, either for the oxidation of cyclohexane (leading to overall yields, based on the alkane, of up to 39% of cyclohexanol and cyclohexanone) or towards the oxidation of toluene (selectively affording benzaldehyde up to a 44% yield), after 2 or 2.5 h of irradiation at 80 or 50 °C, respectively.
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Affiliation(s)
- Manas Sutradhar
- Centro de Química Estrutural, Instituto Superior Técnico, Universidade de Lisboa, Av. Rovisco Pais, 1049-001 Lisboa, Portugal.
| | - Tannistha Roy Barman
- Centro de Química Estrutural, Instituto Superior Técnico, Universidade de Lisboa, Av. Rovisco Pais, 1049-001 Lisboa, Portugal.
| | - Armando J L Pombeiro
- Centro de Química Estrutural, Instituto Superior Técnico, Universidade de Lisboa, Av. Rovisco Pais, 1049-001 Lisboa, Portugal.
| | - Luísa M D R S Martins
- Centro de Química Estrutural, Instituto Superior Técnico, Universidade de Lisboa, Av. Rovisco Pais, 1049-001 Lisboa, Portugal.
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26
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Tinoco P, Almendros G, Sanz J. Soil Perturbation in Mediterranean Ecosystems Reflected by Differences in Free-Lipid Biomarker Assemblages. J Agric Food Chem 2018; 66:9895-9906. [PMID: 30179002 DOI: 10.1021/acs.jafc.8b01483] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/08/2023]
Abstract
Environmental information provided by free lipids in soil samples collected from control and disturbed plots (Madrid, Spain) was assessed by comparing molecular assemblages of terpenoids and distribution patterns of alkanes and fatty acids (FAs) analyzed by gas chromatography-mass spectrometry (GC-MS). Wildfires in pine forests led to increased proportions of retene, dehydroabietin, and simonellite. Friedo-oleananes were characteristic in soils under angiosperms, and norambreinolide-type diterpenes were characteristic in soils encroached by Cistus bushes. Steroids were major compounds in pastured sites. Enhanced Shannon's lipid biodiversity index in disturbed soils compared with in control soils suggested patterns of recent lipids overlapping a preserved original lipid signature. The extent of the environmental impacts was illustrated as Euclidean distances between paired control and disturbed sites calculated using the compounds in alkyl homologous series as descriptors. As expected, reforestation, bush encroachment, wildfires, and cultivation were reflected by changes in the molecular record of lipids in soils.
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Affiliation(s)
- Pilar Tinoco
- Universidad Alfonso X el Sabio, Campus de Villanueva de la Cañada , Avenida Universidad 1 , E-28691 Madrid , Spain
| | | | - Jesús Sanz
- Instituto de Química Orgánica General , CSIC , Juan de la Cierva 3 , E-28006 Madrid , Spain
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27
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Lehtinen T, Santala V, Santala S. Twin-layer biosensor for real-time monitoring of alkane metabolism. FEMS Microbiol Lett 2017; 364:3063326. [PMID: 28333269 DOI: 10.1093/femsle/fnx053] [Citation(s) in RCA: 26] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/23/2016] [Accepted: 03/06/2017] [Indexed: 12/13/2022] Open
Abstract
Intracellular metabolic sensors can be used for efficient screening and optimization of microbial cell factories. In particular, the sensors are useful in acquiring information about pathway dynamics and bottlenecks in a straightforward manner. Here, we developed a twin-layer biosensor that functions simultaneously at two levels: through transcription factor mediated sensing and enzyme-metabolite interaction, providing insights into the dynamics of alkane metabolism. In addition, the sensor can be used for monitoring either alkane degradation or biosynthesis, depending on the used cellular context. Alkanes are monitored using a fluorescent reporter green fluorescent protein placed under a native alkane-inducible promoter, whereas a bacterial luciferase producing bioluminescence signal enzymatically detects a specific metabolic intermediate in the alkane production/degradation pathway. First, we employed the sensor to investigate the native alkane degradation route in Acinetobacter baylyi ADP1. The highest fluorescence and luminescence signals were obtained for dodecane. Second, we constructed a non-native alkane synthesis pathway in A. baylyi ADP1, of which the functionality was confirmed with the sensor. The twin-layer approach provides convenient means to study and optimize the kinetics and performance of the heterologous pathway and will facilitate the development of an efficient cell factory.
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28
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Kinyok MJ, Bonnet S, Noté OP, Ngo Mbing J, Kamto EL, Van der Westhuizen JH, Pegnyemb DE. A new flavanolignan and a new alkane from the Stem bark of Newtonia griffoniana. Nat Prod Res 2017; 31:2233-2238. [PMID: 28287276 DOI: 10.1080/14786419.2017.1299725] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
Abstract
Two new compounds a flavanolignan (1), and an alkane (2) along with four known compounds including two fatty acid esters (3-4) and two isocoumarins (5-6) were isolated from the methanolic extract of the stem bark of Newtonia griffoniana. Their structures were elucidated using spectroscopic methods including extensive 1-D and 2-D NMR experiments.
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Affiliation(s)
- Mc Jesus Kinyok
- a Department of Chemistry, Higher Teachers Training College , University of Yaoundé I , Yaoundé , Cameroon.,b Department of Organic Chemistry, Faculty of Science , University of Yaoundé I , Yaoundé , Cameroon
| | - Susan Bonnet
- c Faculty of Natural and agricultural sciences, Department of Chemistry , University of the Free State , Bloemfontein , South Africa
| | - Olivier Placide Noté
- b Department of Organic Chemistry, Faculty of Science , University of Yaoundé I , Yaoundé , Cameroon
| | - Joséphine Ngo Mbing
- b Department of Organic Chemistry, Faculty of Science , University of Yaoundé I , Yaoundé , Cameroon.,d Centre de Recherche en Plantes Médicinales et Médecine Traditionnelle (CRPMT), IMPM , Yaoundé , Cameroon
| | - Eutrophe Ledoux Kamto
- b Department of Organic Chemistry, Faculty of Science , University of Yaoundé I , Yaoundé , Cameroon
| | - Jan Hendrik Van der Westhuizen
- c Faculty of Natural and agricultural sciences, Department of Chemistry , University of the Free State , Bloemfontein , South Africa
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29
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Li S, Wang S, Yan W. Biodegradation of Methyl tert-Butyl Ether by Co-Metabolism with a Pseudomonas sp. Strain. Int J Environ Res Public Health 2016; 13:E883. [PMID: 27608032 DOI: 10.3390/ijerph13090883] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 06/15/2016] [Revised: 07/17/2016] [Accepted: 08/30/2016] [Indexed: 11/24/2022]
Abstract
Co-metabolic bioremediation is supposed to be an impressive and promising approach in the elimination technology of methyl tert-butyl ether (MTBE), which was found to be a common pollutant worldwide in the ground or underground water in recent years. In this paper, bacterial strain DZ13 (which can co-metabolically degrade MTBE) was isolated and named as Pseudomonas sp. DZ13 based on the result of 16S rRNA gene sequencing analysis. Strain DZ13 could grow on n-alkanes (C5-C8), accompanied with the co-metabolic degradation of MTBE. Diverse n-alkanes with different carbon number showed a significant influence on the degradation rate of MTBE and accumulation of tert-butyl alcohol (TBA). When Pseudomonas sp. DZ13 co-metabolically degraded MTBE with n-pentane as the growth substrate, a higher MTBE-degrading rate (Vmax = 38.1 nmol/min/mgprotein, Ks = 6.8 mmol/L) and lower TBA-accumulation was observed. In the continuous degradation experiment, the removal efficiency of MTBE by Pseudomonas sp. Strain DZ13 did not show an obvious decrease after five times of continuous addition.
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30
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Bai P, Haldoupis E, Dauenhauer PJ, Tsapatsis M, Siepmann JI. Understanding Diffusion in Hierarchical Zeolites with House-of-Cards Nanosheets. ACS Nano 2016; 10:7612-7618. [PMID: 27490401 DOI: 10.1021/acsnano.6b02856] [Citation(s) in RCA: 39] [Impact Index Per Article: 4.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/06/2023]
Abstract
Introducing mesoporosity to conventional microporous sorbents or catalysts is often proposed as a solution to enhance their mass transport rates. Here, we show that diffusion in these hierarchical materials is more complex and exhibits non-monotonic dependence on sorbate loading. Our atomistic simulations of n-hexane in a model system containing microporous nanosheets and mesopore channels indicate that diffusivity can be smaller than in a conventional zeolite with the same micropore structure, and this observation holds true even if we confine the analysis to molecules completely inside the microporous nanosheets. Only at high sorbate loadings or elevated temperatures, when the mesopores begin to be sufficiently populated, does the overall diffusion in the hierarchical material exceed that in conventional microporous zeolites. Our model system is free of structural defects, such as pore blocking or surface disorder, that are typically invoked to explain slower-than-expected diffusion phenomena in experimental measurements. Examination of free energy profiles and visualization of molecular diffusion pathways demonstrates that the large free energy cost (mostly enthalpic in origin) for escaping from the microporous region into the mesopores leads to more tortuous diffusion paths and causes this unusual transport behavior in hierarchical nanoporous materials. This knowledge allows us to re-examine zero-length-column chromatography data and show that these experimental measurements are consistent with the simulation data when the crystallite size instead of the nanosheet thickness is used for the nominal diffusional length.
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Affiliation(s)
- Peng Bai
- Department of Chemical Engineering and Materials Science, University of Minnesota , 421 Washington Avenue SE, Minneapolis, Minnesota 55455, United States
| | - Emmanuel Haldoupis
- Department of Chemistry and Chemical Theory Center, University of Minnesota , 207 Pleasant Street SE, Minneapolis, Minnesota 55455, United States
| | - Paul J Dauenhauer
- Department of Chemical Engineering and Materials Science, University of Minnesota , 421 Washington Avenue SE, Minneapolis, Minnesota 55455, United States
| | - Michael Tsapatsis
- Department of Chemical Engineering and Materials Science, University of Minnesota , 421 Washington Avenue SE, Minneapolis, Minnesota 55455, United States
| | - J Ilja Siepmann
- Department of Chemical Engineering and Materials Science, University of Minnesota , 421 Washington Avenue SE, Minneapolis, Minnesota 55455, United States
- Department of Chemistry and Chemical Theory Center, University of Minnesota , 207 Pleasant Street SE, Minneapolis, Minnesota 55455, United States
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31
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Sebeck K, Shao C, Kieffer J. Alkane-Metal Interfacial Structure and Elastic Properties by Molecular Dynamics Simulation. ACS Appl Mater Interfaces 2016; 8:16885-16896. [PMID: 27282363 DOI: 10.1021/acsami.6b01665] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/06/2023]
Abstract
The structure of amorphous materials near the interface with an ordered substrate can be affected by various characteristics of the adjoining phases, such as the lattice spacing of the adherent surface, polymer chain length, and adhesive strength. To discern the influence of each of these factors, four FCC metal lattices are examined for three chain lengths of n-alkane and van der Waals interfacial interactions are controlled by adjusting the Lennard-Jones 12-6 potential parameters. The role of interaction strength is investigated for a single chain length and substrate combination. Four nanoconfined systems are also analyzed in terms of their mechanical strength. A strong layering effect is observed near the interface for all systems. The distinctiveness of polymer layering, i.e., the maximum density and spatial extent, exhibits a logarithmic dependence on the interaction strength between polymer and substrate. Congruency with the substrate lattice parameter further enhances this effect. Moreover, the elastic modulus of the alkane phase as a function of layer thickness indicates that the effects of ordering within the structure extend beyond the immediately obvious interfacial region.
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Affiliation(s)
- Katherine Sebeck
- Department of Materials Science and Engineering, University of Michigan , 2300 Hayward Street, Ann Arbor, Michigan 48109, United States
| | - Chen Shao
- Department of Materials Science and Engineering, University of Michigan , 2300 Hayward Street, Ann Arbor, Michigan 48109, United States
| | - John Kieffer
- Department of Materials Science and Engineering, University of Michigan , 2300 Hayward Street, Ann Arbor, Michigan 48109, United States
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32
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Wang B, Qiu D, Zhang Y, Wang J. Recent advances in C(sp(3))-H bond functionalization via metal-carbene insertions. Beilstein J Org Chem 2016; 12:796-804. [PMID: 27340470 PMCID: PMC4902055 DOI: 10.3762/bjoc.12.78] [Citation(s) in RCA: 61] [Impact Index Per Article: 7.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/01/2016] [Accepted: 04/06/2016] [Indexed: 11/24/2022] Open
Abstract
The recent development of intermolecular C–H insertion in the application of C(sp3)–H bond functionalizations, especially for light alkanes, is reviewed. The challenging problem of regioselectivity in C–H bond insertions has been tackled by the use of sterically bulky metal catalysts, such as metal porphyrins and silver(I) complexes. In some cases, high regioselectivity and enantioselectivity have been achieved in the C–H bond insertion of small alkanes. This review highlights the most recent accomplishments in this field.
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Affiliation(s)
- Bo Wang
- Beijing National Laboratory of Molecular Sciences (BNLMS), Key Laboratory of Bioorganic Chemistry and Molecular Engineering of Ministry of Education, College of Chemistry, Peking University, Beijing 100871, China
| | - Di Qiu
- Beijing National Laboratory of Molecular Sciences (BNLMS), Key Laboratory of Bioorganic Chemistry and Molecular Engineering of Ministry of Education, College of Chemistry, Peking University, Beijing 100871, China
| | - Yan Zhang
- Beijing National Laboratory of Molecular Sciences (BNLMS), Key Laboratory of Bioorganic Chemistry and Molecular Engineering of Ministry of Education, College of Chemistry, Peking University, Beijing 100871, China
| | - Jianbo Wang
- Beijing National Laboratory of Molecular Sciences (BNLMS), Key Laboratory of Bioorganic Chemistry and Molecular Engineering of Ministry of Education, College of Chemistry, Peking University, Beijing 100871, China
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33
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Herath A, Wawrik B, Qin Y, Zhou J, Callaghan AV. Transcriptional response of Desulfatibacillum alkenivorans AK-01 to growth on alkanes: insights from RT-qPCR and microarray analyses. FEMS Microbiol Ecol 2016; 92:fiw062. [PMID: 27009900 DOI: 10.1093/femsec/fiw062] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 03/16/2016] [Indexed: 12/16/2022] Open
Abstract
Microbial transformation of n-alkanes in anaerobic ecosystems plays a pivotal role in biogeochemical carbon cycling and bioremediation, but the requisite genetic machinery is not well elucidated.Desulfatibacillum alkenivorans AK-01 utilizes n-alkanes (C13 to C18) and contains two genomic loci encoding alkylsuccinate synthase (ASS) gene clusters. ASS catalyzes alkane addition to fumarate to form methylalkylsuccinic acids. We hypothesized that the genes in the two clusters would be differentially expressed depending on the alkane substrate utilized for growth. RT-qPCR was used to investigate ass-gene expression across AK-01's known substrate range, and microarray-based transcriptomic analysis served to investigate whole-cell responses to growth on n-hexadecane versus hexadecanoate. RT-qPCR revealed induction of ass gene cluster 1 during growth on all tested alkane substrates, and the transcriptional start sites in cluster 1 were determined via 5'RACE. Induction of ass gene cluster 2 was not observed under the tested conditions. Transcriptomic analysis indicated that the upregulation of genes potentially involved in methylalkylsuccinate metabolism, including methylmalonyl-CoA mutase and a putative carboxyl transferase. These findings provide new directions for studying the transcriptional regulation of genes involved in alkane addition to fumarate, fumarate recycling and the processing of methylalkylsuccinates with regard to isolates, enrichment cultures and ecological datasets.
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Affiliation(s)
- Anjumala Herath
- Department of Microbiology and Plant Biology, University of Oklahoma, Norman, OK 73019, USA
| | - Boris Wawrik
- Department of Microbiology and Plant Biology, University of Oklahoma, Norman, OK 73019, USA
| | - Yujia Qin
- Department of Microbiology and Plant Biology, University of Oklahoma, Norman, OK 73019, USA Institute of Environmental Genomics, Stephenson Research Center, 101 David L. Boren Blvd, Norman, OK 73019, USA
| | - Jizhong Zhou
- Department of Microbiology and Plant Biology, University of Oklahoma, Norman, OK 73019, USA Institute of Environmental Genomics, Stephenson Research Center, 101 David L. Boren Blvd, Norman, OK 73019, USA Earth Science Division, Lawrence Berkeley National Laboratory, Berkeley, CA 94270, USA State Key Joint Laboratory of Environment Simulation and Pollution Control, School of Environment, Tsinghua University, Beijing 100084, China
| | - Amy V Callaghan
- Department of Microbiology and Plant Biology, University of Oklahoma, Norman, OK 73019, USA
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34
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Foo JL, Susanto AV, Keasling JD, Leong SSJ, Chang MW. Whole-cell biocatalytic and de novo production of alkanes from free fatty acids in Saccharomyces cerevisiae. Biotechnol Bioeng 2016; 114:232-237. [PMID: 26717118 PMCID: PMC5132040 DOI: 10.1002/bit.25920] [Citation(s) in RCA: 49] [Impact Index Per Article: 6.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/27/2015] [Revised: 12/15/2015] [Accepted: 12/29/2015] [Indexed: 12/17/2022]
Abstract
Rapid global industrialization in the past decades has led to extensive utilization of fossil fuels, which resulted in pressing environmental problems due to excessive carbon emission. This prompted increasing interest in developing advanced biofuels with higher energy density to substitute fossil fuels and bio‐alkane has gained attention as an ideal drop‐in fuel candidate. Production of alkanes in bacteria has been widely studied but studies on the utilization of the robust yeast host, Saccharomyces cerevisiae, for alkane biosynthesis have been lacking. In this proof‐of‐principle study, we present the unprecedented engineering of S. cerevisiae for conversion of free fatty acids to alkanes. A fatty acid α‐dioxygenase from Oryza sativa (rice) was expressed in S. cerevisiae to transform C12–18 free fatty acids to C11–17 aldehydes. Co‐expression of a cyanobacterial aldehyde deformylating oxygenase converted the aldehydes to the desired alkanes. We demonstrated the versatility of the pathway by performing whole‐cell biocatalytic conversion of exogenous free fatty acid feedstocks into alkanes as well as introducing the pathway into a free fatty acid overproducer for de novo production of alkanes from simple sugar. The results from this work are anticipated to advance the development of yeast hosts for alkane production. Biotechnol. Bioeng. 2017;114: 232–237. © 2016 The Authors. Biotechnology and Bioengineering Published by Wiley Periodicals, Inc.
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Affiliation(s)
- Jee Loon Foo
- Department of Biochemistry, Yong Loo Lin School of Medicine, National University of Singapore, Singapore.,NUS Synthetic Biology for Clinical and Technological Innovation (SynCTI), Life Sciences Institute, National University of Singapore, Singapore
| | - Adelia Vicanatalita Susanto
- Department of Biochemistry, Yong Loo Lin School of Medicine, National University of Singapore, Singapore.,NUS Synthetic Biology for Clinical and Technological Innovation (SynCTI), Life Sciences Institute, National University of Singapore, Singapore
| | - Jay D Keasling
- Joint BioEnergy Institute, Emeryville, California.,Biological Systems and Engineering Division, Lawrence Berkeley National Laboratory, Berkeley, California.,Department of Chemical and Biomolecular Engineering and Department of Bioengineering, University of California, Berkeley, California
| | - Susanna Su Jan Leong
- Department of Biochemistry, Yong Loo Lin School of Medicine, National University of Singapore, Singapore.,NUS Synthetic Biology for Clinical and Technological Innovation (SynCTI), Life Sciences Institute, National University of Singapore, Singapore.,Singapore Institute of Technology, Singapore
| | - Matthew Wook Chang
- Department of Biochemistry, Yong Loo Lin School of Medicine, National University of Singapore, Singapore.,NUS Synthetic Biology for Clinical and Technological Innovation (SynCTI), Life Sciences Institute, National University of Singapore, Singapore
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35
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Kegel S, Chacon-Caldera J, Tsagogiorgas C, Theisinger B, Glatting G, Schad LR. 19F Oximetry with semifluorinated alkanes. Artif Cells Nanomed Biotechnol 2015; 44:1861-1866. [PMID: 26631543 DOI: 10.3109/21691401.2015.1111228] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/13/2022]
Abstract
This work examines the variation of longitudinal relaxation rate R1(= 1/T1) of the 19F-CF3-resonance of semifluorinated alkanes (SFAs) with oxygen tension (pO2), temperature (T) and pH in vitro. Contrary to their related perfluorocarbons (PFCs), SFA are amphiphilic and facilitate stable emulsions, a prerequisite for clinical use. A linear relationship between R1 and pO2 was confirmed for the observed SFAs at different temperatures. Using a standard saturation recovery sequence, T1 has been successfully measured using fluorine 19F-MRI with a self-constructed birdcage resonator at 9.4 T. A calibration curve to calculate pO2 depending on T and R1 was found for each SFA used. In contrast to the commonly used PFC, SFAs are less sensitive to changes in pO2, but more sensitive to changes in temperature. The influence of pH to R1 was found to be negligible.
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Affiliation(s)
- Stefan Kegel
- a Medical Radiation Physics/Radiation Protection, Universitätsmedizin Mannheim, Medical Faculty Mannheim, Heidelberg University , Mannheim , Germany
| | - Jorge Chacon-Caldera
- b Computer Assisted Clinical Medicine, Universitätsmedizin Mannheim, Medical Faculty Mannheim, Heidelberg University , Mannheim , Germany
| | - Charalambos Tsagogiorgas
- c Department of Anaesthesiology and Surgical Intensive Care Medicine , Universitätsmedizin Mannheim, Medical Faculty Mannheim, Heidelberg University , Mannheim , Germany
| | | | - Gerhard Glatting
- a Medical Radiation Physics/Radiation Protection, Universitätsmedizin Mannheim, Medical Faculty Mannheim, Heidelberg University , Mannheim , Germany
| | - Lothar R Schad
- b Computer Assisted Clinical Medicine, Universitätsmedizin Mannheim, Medical Faculty Mannheim, Heidelberg University , Mannheim , Germany
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Abstract
Compound-specific isotope analysis (CSIA) offers great potential as a tool to provide chemical evidence in a forensic investigation. Many attempts to trace environmental oil spills were successful where isotopic values were particularly distinct. However, difficulties arise when a large data set is analyzed and the isotopic differences between samples are subtle. In the present study, discrimination of diesel oils involved in a diesel theft case was carried out to infer the relatedness of the samples to potential source samples. This discriminatory analysis used a suite of hydrocarbon diagnostic indices, alkanes, to generate carbon and hydrogen isotopic data of the compositions of the compounds which were then processed using multivariate statistical analyses to infer the relatedness of the data set. The results from this analysis were put into context by comparing the data with the δ(13)C and δ(2)H of alkanes in commercial diesel samples obtained from various locations in the South Island of New Zealand. Based on the isotopic character of the alkanes, it is suggested that diesel fuels involved in the diesel theft case were distinguishable. This manuscript shows that CSIA when used in tandem with multivariate statistical analysis provide a defensible means to differentiate and source-apportion qualitatively similar oils at the molecular level. This approach was able to overcome confounding challenges posed by the near single-point source of origin, i.e., the very subtle differences in isotopic values between the samples.
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Affiliation(s)
- Syahidah A Muhammad
- Department of Chemistry, University of Otago Dunedin, New Zealand ; Environmental Technology Division, School of Industrial Technology, Universiti Sains Malaysia Pulau Pinang, Malaysia ; Doping Control Centre, Universiti Sains Malaysia Pulau Pinang, Malaysia
| | - Russell D Frew
- Department of Chemistry, University of Otago Dunedin, New Zealand ; Division of Nuclear Applications in Food and Agriculture, International Atomic Energy Agency Vienna, Austria
| | - Alan R Hayman
- Department of Chemistry, University of Otago Dunedin, New Zealand
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37
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Shiraiwa M, Yee LD, Schilling KA, Loza CL, Craven JS, Zuend A, Ziemann PJ, Seinfeld JH. Size distribution dynamics reveal particle-phase chemistry in organic aerosol formation. Proc Natl Acad Sci U S A 2013; 110:11746-50. [PMID: 23818634 DOI: 10.1073/pnas.1307501110] [Citation(s) in RCA: 131] [Impact Index Per Article: 11.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022] Open
Abstract
Organic aerosols are ubiquitous in the atmosphere and play a central role in climate, air quality, and public health. The aerosol size distribution is key in determining its optical properties and cloud condensation nucleus activity. The dominant portion of organic aerosol is formed through gas-phase oxidation of volatile organic compounds, so-called secondary organic aerosols (SOAs). Typical experimental measurements of SOA formation include total SOA mass and atomic oxygen-to-carbon ratio. These measurements, alone, are generally insufficient to reveal the extent to which condensed-phase reactions occur in conjunction with the multigeneration gas-phase photooxidation. Combining laboratory chamber experiments and kinetic gas-particle modeling for the dodecane SOA system, here we show that the presence of particle-phase chemistry is reflected in the evolution of the SOA size distribution as well as its mass concentration. Particle-phase reactions are predicted to occur mainly at the particle surface, and the reaction products contribute more than half of the SOA mass. Chamber photooxidation with a midexperiment aldehyde injection confirms that heterogeneous reaction of aldehydes with organic hydroperoxides forming peroxyhemiacetals can lead to a large increase in SOA mass. Although experiments need to be conducted with other SOA precursor hydrocarbons, current results demonstrate coupling between particle-phase chemistry and size distribution dynamics in the formation of SOAs, thereby opening up an avenue for analysis of the SOA formation process.
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Ford DC, Dubbeldam D, Snurr RQ, Künzel V, Wehring M, Stallmach F, Kärger J, Müller U. Self-Diffusion of Chain Molecules in the Metal-Organic Framework IRMOF-1: Simulation and Experiment. J Phys Chem Lett 2012; 3:930-933. [PMID: 26286423 DOI: 10.1021/jz300141n] [Citation(s) in RCA: 28] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/04/2023]
Abstract
Metal-organic frameworks (MOFs) possess characteristics, such as tunable pore size and chemical functionality, that make them attractive candidates for separations, catalysis, gas storage, and sensing applications. The rate of diffusion of guest molecules in the pores is an important property for all of these potential applications. In this work, the self-diffusion of hydrocarbons in IRMOF-1 was studied as a function of chain length with a combination of molecular dynamics simulations and pulsed field gradient NMR experiments. Excellent agreement is seen between the experiments and simulations, and the self-diffusion coefficients in IRMOF-1 are on the same order as those in the bulk liquid. Additionally, the effect of concentration on diffusivity was found to be very small for low to moderate loadings. Molecular dynamics simulations also provided insights about the preferential diffusion pathways of these guests in IRMOF-1.
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Affiliation(s)
- Denise C Ford
- †Chemical and Biological Engineering Department, Northwestern University, 2145 Sheridan Road, Evanston Illinois 60208, United States
| | - David Dubbeldam
- †Chemical and Biological Engineering Department, Northwestern University, 2145 Sheridan Road, Evanston Illinois 60208, United States
| | - Randall Q Snurr
- †Chemical and Biological Engineering Department, Northwestern University, 2145 Sheridan Road, Evanston Illinois 60208, United States
| | - Volker Künzel
- ‡Fakultät für Physik und Geowissenschaften, Universität Leipzig, Linnèstrasse 5, 04103 Leipzig, Germany
| | - Markus Wehring
- ‡Fakultät für Physik und Geowissenschaften, Universität Leipzig, Linnèstrasse 5, 04103 Leipzig, Germany
| | - Frank Stallmach
- ‡Fakultät für Physik und Geowissenschaften, Universität Leipzig, Linnèstrasse 5, 04103 Leipzig, Germany
| | - Jörg Kärger
- ‡Fakultät für Physik und Geowissenschaften, Universität Leipzig, Linnèstrasse 5, 04103 Leipzig, Germany
| | - Ulrich Müller
- §BASF SE, GCC/PZ - M301, 67056 Ludwigshafen, Germany
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Robertson DE, Jacobson SA, Morgan F, Berry D, Church GM, Afeyan NB. A new dawn for industrial photosynthesis. Photosynth Res 2011; 107:269-77. [PMID: 21318462 PMCID: PMC3059824 DOI: 10.1007/s11120-011-9631-7] [Citation(s) in RCA: 56] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/05/2010] [Accepted: 01/26/2011] [Indexed: 05/03/2023]
Abstract
Several emerging technologies are aiming to meet renewable fuel standards, mitigate greenhouse gas emissions, and provide viable alternatives to fossil fuels. Direct conversion of solar energy into fungible liquid fuel is a particularly attractive option, though conversion of that energy on an industrial scale depends on the efficiency of its capture and conversion. Large-scale programs have been undertaken in the recent past that used solar energy to grow innately oil-producing algae for biomass processing to biodiesel fuel. These efforts were ultimately deemed to be uneconomical because the costs of culturing, harvesting, and processing of algal biomass were not balanced by the process efficiencies for solar photon capture and conversion. This analysis addresses solar capture and conversion efficiencies and introduces a unique systems approach, enabled by advances in strain engineering, photobioreactor design, and a process that contradicts prejudicial opinions about the viability of industrial photosynthesis. We calculate efficiencies for this direct, continuous solar process based on common boundary conditions, empirical measurements and validated assumptions wherein genetically engineered cyanobacteria convert industrially sourced, high-concentration CO(2) into secreted, fungible hydrocarbon products in a continuous process. These innovations are projected to operate at areal productivities far exceeding those based on accumulation and refining of plant or algal biomass or on prior assumptions of photosynthetic productivity. This concept, currently enabled for production of ethanol and alkane diesel fuel molecules, and operating at pilot scale, establishes a new paradigm for high productivity manufacturing of nonfossil-derived fuels and chemicals.
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Affiliation(s)
- Dan E. Robertson
- Biological Sciences, Joule Unlimited, 83 Rogers Street, Cambridge, MA 02142 USA
| | | | - Frederick Morgan
- Engineering, Joule Unlimited, 83 Rogers Street, Cambridge, MA 02142 USA
| | - David Berry
- Flagship VentureLabs, 1 Memorial Drive, Cambridge, MA 02142 USA
| | - George M. Church
- Department of Genetics, Harvard University, School of Medicine, 77 Ave Louis Pasteur, NRB 238, Boston, MA 02115 USA
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40
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Thomas AS, Elcock AH. Direct Measurement of the Kinetics and Thermodynamics of Association of Hydrophobic Molecules from Molecular Dynamics Simulations. J Phys Chem Lett 2011; 2:19-24. [PMID: 26295208 DOI: 10.1021/jz1014899] [Citation(s) in RCA: 25] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/04/2023]
Abstract
A detailed study of the kinetics and thermodynamics of associations of model hydrophobic molecules is likely to be valuable for understanding the fundamental driving forces for processes such as protein folding and protein-protein association. To this end, we present results from a series of 500 ns long molecular dynamics (MD) simulations examining associations of 13 types of different alkane pairs in explicit water. In addition to providing accurate measurements of the association thermodynamics, the unbiased nature of the configurational sampling in the MD simulations allows the association and dissociation kinetics to be directly quantified. We show that by choosing a suitable reaction coordinate, the computed free energies of all of the alkane-alkane complexes can be linearly related to their buried molecular surface areas, that their dissociation kinetics can be reliably estimated from the height of the barrier on the computed free energy surfaces, and that their association kinetics are effectively diffusion-limited.
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Affiliation(s)
- Andrew S Thomas
- Department of Biochemistry, University of Iowa, 51 Newton Road, Iowa City, Iowa 52242, United States
| | - Adrian H Elcock
- Department of Biochemistry, University of Iowa, 51 Newton Road, Iowa City, Iowa 52242, United States
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