1
|
Hagaggi NSA, Rady EAE. The potential of Bacillus species isolated from Cinnamomum camphora for biofuel production. Microb Cell Fact 2024; 23:139. [PMID: 38750603 PMCID: PMC11097477 DOI: 10.1186/s12934-024-02402-4] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/19/2024] [Accepted: 04/23/2024] [Indexed: 05/18/2024] Open
Abstract
BACKGROUND Increasing concerns about climate change and global petroleum supply draw attention to the urgent need for the development of alternative methods to produce fuels. Consequently, the scientific community must devise novel ways to obtain fuels that are both sustainable and eco-friendly. Bacterial alkanes have numerous potential applications in the industry sector. One significant application is biofuel production, where bacterial alkanes can serve as a sustainable eco-friendly alternative to fossil fuels. This study represents the first report on the production of alkanes by endophytic bacteria. RESULTS In this study, three Bacillus species, namely Bacillus atrophaeus Camph.1 (OR343176.1), Bacillus spizizenii Camph.2 (OR343177.1), and Bacillus aerophilus Camph.3 (OR343178.1), were isolated from the leaves of C. camphora. The isolates were then screened to determine their ability to produce alkanes in different culture media including nutrient broth (NB), Luria-Bertani (LB) broth, and tryptic soy broth (TSB). Depending on the bacterial isolate and the culture media used, different profiles of alkanes ranging from C8 to C31 were detected. CONCLUSIONS The endophytic B. atrophaeus Camph.1 (OR343176.1), B. spizizenii Camph.2 (OR343177.1), and B. aerophilus Camph.3 (OR343178.1), associated with C. camphora leaves, represent new eco-friendly approaches for biofuel production, aiming towards a sustainable future. Further research is needed to optimize the fermentation process and scale up alkane production by these bacterial isolates.
Collapse
Affiliation(s)
- Noura Sh A Hagaggi
- Botany Department, Faculty of Science, Aswan University, Aswan, 81528, Egypt.
| | - Eman A El Rady
- Chemistry Department, Faculty of Science, Aswan University, Aswan, 81528, Egypt
| |
Collapse
|
2
|
Vrkoslav V, Horká P, Jindřich J, Buděšínský M, Cvačka J. Silver Ion High-Performance Liquid Chromatography-Atmospheric Pressure Chemical Ionization Mass Spectrometry: A Tool for Analyzing Cuticular Hydrocarbons. Molecules 2023; 28:molecules28093794. [PMID: 37175204 PMCID: PMC10179885 DOI: 10.3390/molecules28093794] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/24/2023] [Revised: 04/17/2023] [Accepted: 04/25/2023] [Indexed: 05/15/2023] Open
Abstract
Aliphatic hydrocarbons (HCs) are usually analyzed by gas chromatography (GC) or matrix-assisted laser desorption/ionization (MALDI) mass spectrometry. However, analyzing long-chain HCs by GC is difficult because of their low volatility and the risk of decomposition at high temperatures. MALDI cannot distinguish between isomeric HCs. An alternative approach based on silver ion high-performance liquid chromatography (Ag-HPLC) is shown here. The separation of HC standards and cuticular HCs was accomplished using two ChromSpher Lipids columns connected in series. A gradient elution of the analytes was optimized using mobile phases prepared from hexane (or isooctane) and acetonitrile, 2-propanol, or toluene. HCs were detected by atmospheric pressure chemical ionization mass spectrometry (APCI-MS). Good separation of the analytes according to the number of double bonds, cis/trans geometry, and position of double bonds was achieved. The retention times increased with the number of double bonds, and trans isomers eluted ahead of cis isomers. The mobile phase significantly affected the mass spectra of HCs. Depending on the mobile phase composition, deprotonated molecules, molecular ions, protonated molecules, and various solvent-related adducts of HCs were observed. The optimized Ag-HPLC/APCI-MS was applied for characterizing cuticular HCs from a flesh fly, Neobellieria bullata, and cockroach, Periplaneta americana. The method made it possible to detect a significantly higher number of HCs than previously reported for GC or MALDI-MS. Unsaturated HCs were frequently detected as isomers differing by double-bond position(s). Minor HCs with trans double bonds were found beside the prevailing cis isomers. Ag-HPLC/APCI-MS has great potential to become a new tool in chemical ecology for studying cuticular HCs.
Collapse
Affiliation(s)
- Vladimír Vrkoslav
- Institute of Organic Chemistry and Biochemistry of the Czech Academy of Sciences, Flemingovo Náměstí 542/2, 160 00 Prague, Czech Republic
| | - Petra Horká
- Institute of Organic Chemistry and Biochemistry of the Czech Academy of Sciences, Flemingovo Náměstí 542/2, 160 00 Prague, Czech Republic
- Department of Analytical Chemistry, Faculty of Science, Charles University, Hlavova 2030/8, 128 00 Prague, Czech Republic
| | - Jindřich Jindřich
- Department of Organic Chemistry, Faculty of Science, Charles University, Hlavova 2030/8, 128 00 Prague, Czech Republic
| | - Miloš Buděšínský
- Institute of Organic Chemistry and Biochemistry of the Czech Academy of Sciences, Flemingovo Náměstí 542/2, 160 00 Prague, Czech Republic
| | - Josef Cvačka
- Institute of Organic Chemistry and Biochemistry of the Czech Academy of Sciences, Flemingovo Náměstí 542/2, 160 00 Prague, Czech Republic
- Department of Analytical Chemistry, Faculty of Science, Charles University, Hlavova 2030/8, 128 00 Prague, Czech Republic
| |
Collapse
|
3
|
A Novel FadL Homolog, AltL, Mediates Transport of Long-Chain Alkanes and Fatty Acids in Acinetobacter venetianus RAG-1. Appl Environ Microbiol 2022; 88:e0129422. [PMID: 36169310 PMCID: PMC9599521 DOI: 10.1128/aem.01294-22] [Citation(s) in RCA: 5] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
Abstract
Due to the barrier effect of lipopolysaccharide (LPS) in the outer membrane of Gram-negative bacteria, transporters are required for hydrophobic alkane uptake. However, there are few reports on long-chain alkane transporters. In this study, a potential long-chain alkane transporter (AltL) was screened in Acinetobacter venetianus RAG-1 by comparative transcriptome analysis. Growth and degradation experiments showed that altL deletion led to the loss of n-octacosane utilization capacity of RAG-1. To identify the function of AltL, we measured the existence and accumulation of alkanes in cells through the constructed alkane detection system and isotope transport experiment, which proved its long-chain alkane transport function. Growth experiments using different chain-length n-alkanes and fatty acids as substrates showed that AltL was responsible for the transport of (very) long-chain n-alkanes (C20 to C38) and fatty acids (C18A to C28A) and was also involved in the uptake of medium-chain n-alkanes (C16 to C18). Subsequently, we analyzed the distribution of AltL in bacteria, and found that AltL homologs are widespread in Gamma-, Beta-, and Deltaproteobacteria. An AltL homolog in Pseudomonas aeruginosa was also identified to participate in long-chain alkane transport by a gene deletion and growth assay. We also found that overexpression of altL in Pseudomonas aeruginosa enhanced the degradation of C16 to C32 n-alkanes. In addition, structure analysis showed that AltL has longer extracellular loops than other FadL family members, which may be involved in the binding of alkanes. These results showed that AltL is a novel transporter and that it is mainly responsible for the transport of long-chain n-alkanes and (very) long-chain fatty acids and has broad application potential. IMPORTANCE Petroleum pollution has caused great harm to the natural environment, and alkanes are the main components of petroleum. Many Gram-negative bacteria can use alkanes as carbon and energy sources, which is an important strategy for oil pollution remediation. Alkane uptake is the first step for its utilization. Hence, the characterization of transport proteins is of great significance for the recovery of oil pollution and other potential applications in industrial engineering bacteria. At present, some short- and medium-chain alkane transporters have been identified, but stronger hydrophobic long-chain alkane transporters have received little attention. In this study, the broad-spectrum transporter AltL, identified in RAG-1, makes up for the lack of research on the transport of long-chain alkanes and (very) long-chain fatty acids. Meanwhile, the structural features of longer extracellular loops might be related to its unique transport function on more hydrophobic and larger substrates, indicating it is a novel type alkane transporter.
Collapse
|
4
|
Costa IG, Coelho Vargas JV, Balmant W, Ramos LP, Zandoná Filho A, Taher DM, Mariano AB, Yamamoto CI, Conceição D, Kava VM. Microalgae‐Derived Green Diesel. Chem Eng Technol 2022. [DOI: 10.1002/ceat.202100647] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
Affiliation(s)
- Iago G. Costa
- Federal University of Paraná, UFPR Department of Mechanical Engineering, Graduate Program in Mechanical Engineering, PGMEC, CP 19011 81531-980 Curitiba PR Brazil
- Federal University of Paraná, UFPR Graduate Program in Materials Science Engineering, PIPE, CP 19011 81531-980 Curitiba PR Brazil
- Federal University of Paraná, UFPR Sustainable Energy Research & Development Center, NPDEAS, CP 19011 81531-980 Curitiba PR Brazil
| | - José V. Coelho Vargas
- Federal University of Paraná, UFPR Department of Mechanical Engineering, Graduate Program in Mechanical Engineering, PGMEC, CP 19011 81531-980 Curitiba PR Brazil
- Federal University of Paraná, UFPR Graduate Program in Materials Science Engineering, PIPE, CP 19011 81531-980 Curitiba PR Brazil
- Federal University of Paraná, UFPR Sustainable Energy Research & Development Center, NPDEAS, CP 19011 81531-980 Curitiba PR Brazil
| | - Wellington Balmant
- Federal University of Paraná, UFPR Department of Mechanical Engineering, Graduate Program in Mechanical Engineering, PGMEC, CP 19011 81531-980 Curitiba PR Brazil
- Federal University of Paraná, UFPR Graduate Program in Materials Science Engineering, PIPE, CP 19011 81531-980 Curitiba PR Brazil
- Federal University of Paraná, UFPR Sustainable Energy Research & Development Center, NPDEAS, CP 19011 81531-980 Curitiba PR Brazil
| | - Luiz P. Ramos
- Federal University of Paraná, UFPR Sustainable Energy Research & Development Center, NPDEAS, CP 19011 81531-980 Curitiba PR Brazil
- Federal University of Paraná, UFPR Department of Chemistry, Graduate Program in Chemistry, PGQ, CP 19011 81531-980 Curitiba PR Brazil
| | - Arion Zandoná Filho
- Federal University of Paraná, UFPR Sustainable Energy Research & Development Center, NPDEAS, CP 19011 81531-980 Curitiba PR Brazil
- Federal University of Paraná, UFPR Department of Chemical Engineering, Graduate Program in Chemical Engineering, PGEQ, CP 19011 81531-980 Curitiba PR Brazil
| | - Dhyogo M. Taher
- Federal University of Paraná, UFPR Graduate Program in Materials Science Engineering, PIPE, CP 19011 81531-980 Curitiba PR Brazil
- Federal University of Paraná, UFPR Sustainable Energy Research & Development Center, NPDEAS, CP 19011 81531-980 Curitiba PR Brazil
| | - André B. Mariano
- Federal University of Paraná, UFPR Graduate Program in Materials Science Engineering, PIPE, CP 19011 81531-980 Curitiba PR Brazil
- Federal University of Paraná, UFPR Sustainable Energy Research & Development Center, NPDEAS, CP 19011 81531-980 Curitiba PR Brazil
- Federal University of Paraná, UFPR Department of Electrical Engineering, PIPE, CP 19011 81531-980 Curitiba PR Brazil
| | - Carlos I. Yamamoto
- Federal University of Paraná, UFPR Graduate Program in Materials Science Engineering, PIPE, CP 19011 81531-980 Curitiba PR Brazil
- Federal University of Paraná, UFPR Department of Chemical Engineering, Graduate Program in Chemical Engineering, PGEQ, CP 19011 81531-980 Curitiba PR Brazil
| | - Daniele Conceição
- Federal University of Paraná, UFPR Sustainable Energy Research & Development Center, NPDEAS, CP 19011 81531-980 Curitiba PR Brazil
- Federal University of Paraná, UFPR Department of Genetics, Laboratory of Genetics of Microorganisms, CP 19011 81531-980 Curitiba PR Brazil
| | - Vanessa M. Kava
- Federal University of Paraná, UFPR Sustainable Energy Research & Development Center, NPDEAS, CP 19011 81531-980 Curitiba PR Brazil
- Federal University of Paraná, UFPR Department of Genetics, Laboratory of Genetics of Microorganisms, CP 19011 81531-980 Curitiba PR Brazil
| |
Collapse
|
5
|
Kaur D, Singh RP, Gupta S. Screening and Characterization of Next-Generation Biofuels Producing Bacterial Strains. Curr Microbiol 2022; 79:85. [PMID: 35129690 DOI: 10.1007/s00284-022-02781-0] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/23/2021] [Accepted: 01/20/2022] [Indexed: 11/28/2022]
Abstract
Production of fuels from renewable resources is of utmost importance due to fast depletion of fossil resources and related environmental issues. The present study explored the intrinsic capability of microbial strains to produce alka(e)nes, the next-generation biofuel, thus to reduce the dependence upon current petroleum fuels. Eight bacterial strains, namely, SDK-1, SDK-2, SDK-6, SDK-7, SDK-8, SDK-9, SDK-10, and SDK-11 were isolated from sludge and soil samples collected from different sources using lauric acid as a substrate with a potential to produce alka(e)nes. Production of different medium- and long-chain alka(e)nes by these isolates was confirmed via gas chromatography-mass spectrometer (GC-MS) analysis. SDK-1 (7.2%), SDK-2 (3.72%), and SDK-6 (3.52%) produced significant proportion of medium-chain hydrocarbons as compared to SDK-10 and control with no production. These isolates may be further investigated for production of these alternative sources of energy. In contrary, maximum fraction of long-chain hydrocarbons is produced in SDK-8 (75.28%) followed by SDK-9 (61.51%). Similarly more than 50% of the total hydrocarbons produced in SDK-8 constitute fossil mimic hydrocarbons while only 10.78% fractions were found in SDK-10. Since these fractions resemble different hydrocarbons obtained from crude oil, hence may be explored for their wide applications in different fields. Biochemical characterization and sequencing of the 16S rRNA gene revealed the homology of SDK-1, SDK-2 and SDK-6 with Pseudomonas aeruginosa, SDK-7 and SDK-9 with Enterobacter cloacae, SDK-8 with Klebsiella pnuemoniae, SDK-10 with Enterobacter hormaechei and SDK-11 with Pseudomonas nitroreducens, respectively.
Collapse
Affiliation(s)
- Damanjeet Kaur
- Department of Microbiology, Mata Gujri College, Fatehgarh Sahib, Punjab, 140406, India.,Department of Biotechnology, Punjabi University, Patiala, Punjab, India
| | - Rupinder Pal Singh
- Department of Food Processing Technology, Sri Guru Granth Sahib World University, Fatehgarh Sahib, Punjab, India
| | - Saurabh Gupta
- Department of Microbiology, Mata Gujri College, Fatehgarh Sahib, Punjab, 140406, India.
| |
Collapse
|
6
|
Esakkimuthu S, Wang S, Abomohra AEF. CO2-Mediated Energy Conversion and Recycling. WASTE-TO-ENERGY 2022:379-409. [DOI: 10.1007/978-3-030-91570-4_13] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 09/01/2023]
|
7
|
Potentiality of Azolla pinnata R. Br. for Phytoremediation of Polluted Freshwater with Crude Petroleum Oil. SEPARATIONS 2021. [DOI: 10.3390/separations8040039] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022] Open
Abstract
The pollution of freshwater resources with crude petroleum oil is a major environmental issue in oil-producing countries. As a result, the remediation of polluted aquatic ecosystems using eco-friendly and cost-effective technology is receiving increased global attention. In this study, the ability of Azolla pinnata R. Br. to remediate petroleum-polluted freshwater was assessed. The remediation potentiality was determined by evaluating the total petroleum hydrocarbon degradation percentage (TPH%) and changes in the molecular type composition of saturated and aromatic hydrocarbon fractions. TPH% was estimated gravimetrically, and changes in the molecular type composition of saturated and aromatic fractions were measured using gas chromatography and high-performance liquid chromatography, respectively. The results reveal that A. pinnata has the potential to phytoremediate freshwater polluted with low levels (up to 0.5 g/L) of petroleum hydrocarbons (PHs). After seven days of phytoremediation, the degradation rate of total PHs was 92% in the planted treatment compared with 38% in the unplanted positive control. The highest breakdown of PHs for the normal paraffinic saturated hydrocarbon fraction occurred in the presence of A. pinnata combined with Anabena azollaea (A-A), which showed a moderate degradation capacity toward total aromatic hydrocarbons (TAHs) and total polycyclic aromatic hydrocarbons (PAHs). The results indicate that A. pinnata effectively removed C18, a saturated PH, and acenaphthene (Ace), an aromatic PH. Therefore, this study suggests that A. pinnata is a useful tool for the remediation of freshwaters contaminated with low pollution levels of crude oil.
Collapse
|
8
|
Jia SL, Chi Z, Liu GL, Hu Z, Chi ZM. Fungi in mangrove ecosystems and their potential applications. Crit Rev Biotechnol 2020; 40:852-864. [PMID: 32633147 DOI: 10.1080/07388551.2020.1789063] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023]
Abstract
Mangrove fungi, their ecological role in mangrove ecosystems, their bioproducts, and potential applications are reviewed in this article. Mangrove ecosystems can play an important role in beach protection, accretion promotion, and sheltering coastlines and creeks as barriers against devastating tropical storms and waves, seawater, and air pollution. The ecosystems are characterized by high average and constant temperatures, high salinity, strong winds, and anaerobic muddy soil. The mangrove ecosystems also provide the unique habitats for the colonization of fungi which can produce different kinds of enzymes for industrial uses, recycling of plants and animals in the ecosystems, and the degradation of pollutants. Many mangrove ecosystem-associated fungi also can produce exopolysaccharides, Ca2+-gluconic acid, polymalate, liamocin, polyunsaturated fatty acids, biofuels, xylitol, enzymes, and bioactive substances, which have many potential applications in the bioenergy, food, agricultural, and pharmaceutical industries. Therefore, mangrove ecosystems are rich bioresources for bioindustries and ecology. It is necessary to identify more mangrove fungi and genetically edit them to produce a distinct array of novel chemical entities, enzymes, and bioactive substances.
Collapse
Affiliation(s)
- Shu-Lei Jia
- College of Marine Life Sciences, Ocean University of China, Qingdao, China
| | - Zhe Chi
- College of Marine Life Sciences, Ocean University of China, Qingdao, China.,Key Laboratory of Marine Genetics and Breeding, Ocean University of China, Qingdao, China
| | - Guang-Lei Liu
- College of Marine Life Sciences, Ocean University of China, Qingdao, China.,Key Laboratory of Marine Genetics and Breeding, Ocean University of China, Qingdao, China
| | - Zhong Hu
- Department of Biology, Shantou University, Shantou, China
| | - Zhen-Ming Chi
- College of Marine Life Sciences, Ocean University of China, Qingdao, China.,Key Laboratory of Marine Genetics and Breeding, Ocean University of China, Qingdao, China
| |
Collapse
|
9
|
Zhao SF, Chi Z, Liu GL, Hu Z, Wu LF, Chi ZM. Biosynthesis of some organic acids and lipids in industrially important microorganisms is promoted by pyruvate carboxylases. J Biosci 2019. [DOI: 10.1007/s12038-019-9853-y] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
|
10
|
Wang H, Ni X, Harris-Shultz K. Molecular evolution of the plant ECERIFERUM1 and ECERIFERUM3 genes involved in aliphatic hydrocarbon production. Comput Biol Chem 2019; 80:1-9. [PMID: 30851618 DOI: 10.1016/j.compbiolchem.2019.02.009] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/25/2018] [Revised: 01/28/2019] [Accepted: 02/25/2019] [Indexed: 12/20/2022]
Abstract
The Arabidopsis ECERIFERUM1 (CER1) protein is a decarbonylase that converts fatty acid metabolites into alkanes. Alkanes are components of waxes in the plant cuticle, a waterproof barrier serving to protect land plants from both biotic and abiotic stimuli. CER1 enzymes can be used to produce alternative and sustainable hydrocarbons in eukaryotic systems. In this report we identified 193 CER1 and 128 CER3 sequences from 56 land plants respectively. CER1 and CER3 proteins have high amino acid similarity and both are involved in alkane synthesis in Arabidopsis. The common homologues of CER1 and CER3 genes were identified in three species of chlorophytes, which may be one of the earliest plant taxa that possess CER1 and CER3 genes. To facilitate potential applications, the 3-dimensional structure and conserved motifs of CER1 proteins were also characterized. CER1 and CER3 proteins are structurally similar, but CER1 proteins have more conserved histidine-containing motifs common to fatty acid hydroxylases and stearoyl-CoA desaturases. There was no significant loss or gain of protein motifs after ancient and recent duplications, suggesting that varied properties of CER1 proteins may be associated with less-conserved regions. Among 56 land plants, the codon-based assessments of selection modes revealed that neither entire proteins nor individual amino acids of CER1 proteins were significantly subjected to positive selection, indicating that CER1 proteins are highly conserved throughout evolution.
Collapse
Affiliation(s)
- Hongliang Wang
- U.S. Department of Agriculture, Agricultural Research Service, Crop Genetics and Breeding Research Unit, 115 Coastal Way, Tifton, GA, 31793, USA
| | - Xinzhi Ni
- U.S. Department of Agriculture, Agricultural Research Service, Crop Genetics and Breeding Research Unit, 115 Coastal Way, Tifton, GA, 31793, USA
| | - Karen Harris-Shultz
- U.S. Department of Agriculture, Agricultural Research Service, Crop Genetics and Breeding Research Unit, 115 Coastal Way, Tifton, GA, 31793, USA.
| |
Collapse
|
11
|
Knoot CJ, Pakrasi HB. Diverse hydrocarbon biosynthetic enzymes can substitute for olefin synthase in the cyanobacterium Synechococcus sp. PCC 7002. Sci Rep 2019; 9:1360. [PMID: 30718738 PMCID: PMC6361979 DOI: 10.1038/s41598-018-38124-y] [Citation(s) in RCA: 16] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/10/2018] [Accepted: 12/12/2018] [Indexed: 11/09/2022] Open
Abstract
Cyanobacteria are among only a few organisms that naturally synthesize long-chain alkane and alkene hydrocarbons. Cyanobacteria use one of two pathways to synthesize alka/enes, either acyl-ACP reductase (Aar) and aldehyde deformylating oxygenase (Ado) or olefin synthase (Ols). The genomes of cyanobacteria encode one of these pathways but never both, suggesting a mutual exclusivity. We studied hydrocarbon pathway compatibility using the model cyanobacterium Synechococcus sp. PCC 7002 (S7002) by co-expressing Ado/Aar and Ols and by entirely replacing Ols with three other types of hydrocarbon biosynthetic pathways. We find that Ado/Aar and Ols can co-exist and that slower growth occurs only when Ado/Aar are overexpressed at 38 °C. Furthermore, Ado/Aar and the non-cyanobacterial enzymes UndA and fatty acid photodecarboxylase are able to substitute for Ols in a knockout strain and conditionally rescue slow growth. Production of hydrocarbons by UndA in S7002 required a rational mutation to increase substrate range. Expression of the non-native enzymes in S7002 afforded unique hydrocarbon profiles and alka/enes not naturally produced by cyanobacteria. This suggests that the biosynthetic enzyme and the resulting types of hydrocarbons are not critical to supporting growth. Exchanging or mixing hydrocarbon pathways could enable production of novel types of CO2-derived hydrocarbons in cyanobacteria.
Collapse
Affiliation(s)
- Cory J Knoot
- Department of Biology, Washington University, St. Louis, Missouri, 63130, USA
| | - Himadri B Pakrasi
- Department of Biology, Washington University, St. Louis, Missouri, 63130, USA.
| |
Collapse
|
12
|
Influence of the killing method of the black soldier fly on its lipid composition. Food Res Int 2019; 116:276-282. [DOI: 10.1016/j.foodres.2018.08.033] [Citation(s) in RCA: 41] [Impact Index Per Article: 8.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/17/2018] [Revised: 07/11/2018] [Accepted: 08/12/2018] [Indexed: 12/13/2022]
|
13
|
Xue SJ, Chi Z, Zhang Y, Li YF, Liu GL, Jiang H, Hu Z, Chi ZM. Fatty acids from oleaginous yeasts and yeast-like fungi and their potential applications. Crit Rev Biotechnol 2018; 38:1049-1060. [DOI: 10.1080/07388551.2018.1428167] [Citation(s) in RCA: 38] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
Affiliation(s)
- Si-Jia Xue
- College of Marine Life Sciences, Ocean University of China, Qingdao, China
| | - Zhe Chi
- College of Marine Life Sciences, Ocean University of China, Qingdao, China
- Laboratory for Marine Biology and Biotechnology, Qingdao National Laboratory for Marine Science and Technology, Qingdao, China
| | - Yu Zhang
- College of Marine Life Sciences, Ocean University of China, Qingdao, China
| | - Yan-Feng Li
- College of Marine Life Sciences, Ocean University of China, Qingdao, China
| | - Guang-Lei Liu
- College of Marine Life Sciences, Ocean University of China, Qingdao, China
- Laboratory for Marine Biology and Biotechnology, Qingdao National Laboratory for Marine Science and Technology, Qingdao, China
| | - Hong Jiang
- College of Marine Life Sciences, Ocean University of China, Qingdao, China
| | - Zhong Hu
- Department of Biology, Shantou University, Shantou, China
| | - Zhen-Ming Chi
- College of Marine Life Sciences, Ocean University of China, Qingdao, China
- Laboratory for Marine Biology and Biotechnology, Qingdao National Laboratory for Marine Science and Technology, Qingdao, China
| |
Collapse
|
14
|
Pokhilko A. Monitoring of nutrient limitation in growing E. coli: a mathematical model of a ppGpp-based biosensor. BMC SYSTEMS BIOLOGY 2017; 11:106. [PMID: 29157236 PMCID: PMC5697348 DOI: 10.1186/s12918-017-0490-5] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 06/05/2017] [Accepted: 11/10/2017] [Indexed: 11/26/2022]
Abstract
Background E. coli can be used as bacterial cell factories for production of biofuels and other useful compounds. The efficient production of the desired products requires careful monitoring of growth conditions and the optimization of metabolic fluxes. To avoid nutrient depletion and maximize product yields we suggest using a natural mechanism for sensing nutrient limitation, related to biosynthesis of an intracellular messenger - guanosine tetraphosphate (ppGpp). Results We propose a design for a biosensor, which monitors changes in the intracellular concentration of ppGpp by coupling it to a fluorescent output. We used mathematical modelling to analyse the intracellular dynamics of ppGpp, its fluorescent reporter, and cell growth in normal and fatty acid-producing E. coli lines. The model integrates existing mechanisms of ppGpp regulation and predicts the biosensor response to changes in nutrient state. In particular, the model predicts that excessive stimulation of fatty acid production depletes fatty acid intermediates, downregulates growth and increases the levels of ppGpp-related fluorescence. Conclusions Our analysis demonstrates that the ppGpp sensor can be used for early detection of nutrient limitation during cell growth and for testing productivity of engineered lines. Electronic supplementary material The online version of this article (10.1186/s12918-017-0490-5) contains supplementary material, which is available to authorized users.
Collapse
Affiliation(s)
- Alexandra Pokhilko
- Institute of Molecular, Cell and Systems Biology, University of Glasgow, Glasgow, Scotland, UK.
| |
Collapse
|
15
|
Harnessing yeast organelles for metabolic engineering. Nat Chem Biol 2017; 13:823-832. [DOI: 10.1038/nchembio.2429] [Citation(s) in RCA: 97] [Impact Index Per Article: 13.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/06/2016] [Accepted: 05/23/2016] [Indexed: 11/08/2022]
|
16
|
Characterization of Polyethylene Oxide and Sodium Alginate for Oil Contaminated-Sand Remediation. SUSTAINABILITY 2017. [DOI: 10.3390/su9010062] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/16/2023]
|
17
|
Xie M, Wang W, Zhang W, Chen L, Lu X. Versatility of hydrocarbon production in cyanobacteria. Appl Microbiol Biotechnol 2016; 101:905-919. [DOI: 10.1007/s00253-016-8064-9] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/01/2016] [Revised: 12/07/2016] [Accepted: 12/10/2016] [Indexed: 10/20/2022]
|
18
|
Jiménez-Díaz L, Caballero A, Pérez-Hernández N, Segura A. Microbial alkane production for jet fuel industry: motivation, state of the art and perspectives. Microb Biotechnol 2016; 10:103-124. [PMID: 27723249 PMCID: PMC5270751 DOI: 10.1111/1751-7915.12423] [Citation(s) in RCA: 45] [Impact Index Per Article: 5.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/24/2016] [Revised: 09/09/2016] [Accepted: 09/15/2016] [Indexed: 11/27/2022] Open
Abstract
Bio‐jet fuel has attracted a lot of interest in recent years and has become a focus for aircraft and engine manufacturers, oil companies, governments and researchers. Given the global concern about environmental issues and the instability of oil market, bio‐jet fuel has been identified as a promising way to reduce the greenhouse gas emissions from the aviation industry, while also promoting energy security. Although a number of bio‐jet fuel sources have been approved for manufacture, their commercialization and entry into the market is still a far way away. In this review, we provide an overview of the drivers for intensified research into bio‐jet fuel technologies, the type of chemical compounds found in bio‐jet fuel preparations and the current state of related pre‐commercial technologies. The biosynthesis of hydrocarbons is one of the most promising approaches for bio‐jet fuel production, and thus we provide a detailed analysis of recent advances in the microbial biosynthesis of hydrocarbons (with a focus on alkanes). Finally, we explore the latest developments and their implications for the future of research into bio‐jet fuel technologies.
Collapse
Affiliation(s)
- Lorena Jiménez-Díaz
- Abengoa Research, Campus Palmas Altas, C/Energía Solar, 41014, Sevilla, Spain
| | - Antonio Caballero
- Abengoa Research, Campus Palmas Altas, C/Energía Solar, 41014, Sevilla, Spain
| | | | - Ana Segura
- Abengoa Research, Campus Palmas Altas, C/Energía Solar, 41014, Sevilla, Spain.,Estación Experimental del Zaidín-CSIC, C/Profesor Albareda s/n, 18008, Granada, Spain
| |
Collapse
|
19
|
Jung J, Jang J, Ahn J. Characterization of a Polyacrylamide Solution Used for Remediation of Petroleum Contaminated Soils. MATERIALS 2016; 9:ma9010016. [PMID: 28787815 PMCID: PMC5456553 DOI: 10.3390/ma9010016] [Citation(s) in RCA: 33] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 10/08/2015] [Revised: 12/19/2015] [Accepted: 12/21/2015] [Indexed: 11/16/2022]
Abstract
Biopolymers are viewed as effective and eco-friendly agents in soil modification. This study focuses on the wettability analysis of polyacrylamide (PAM) solutions for soil remediation. The contact angle, surface tension, and viscosity of PAM solutions were experimentally evaluated in air- and decane-biopolymer solution systems. Furthermore, a micromodel was used to investigate the pore-scale displacement phenomena during the injection of the PAM solution in decane and or air saturated pores. The contact angle of the PAM solution linearly increases with increasing concentration in air but not in decane. The surface tension between the PAM solution and air decreases at increasing concentration. The viscosity of the PAM solution is highly dependent on the concentration of the solution, shear rate, and temperature. Low flow rate and low concentration result in a low displacement ratio level, which is defined as the volume ratio between the injected and the defended fluids in the pores. The displacement ratio is higher for PAM solutions than distilled water; however, a higher concentration does not necessarily guarantees a higher displacement ratio. Soil remediation could be conducted cost-efficiently at high flow rates but with moderate concentration levels.
Collapse
Affiliation(s)
- Jongwon Jung
- Department of Civil and Environmental Engineering, Louisiana State University, Baton Rouge, LA 70803, USA.
| | - Jungyeon Jang
- Department of Civil and Environmental Engineering, Louisiana State University, Baton Rouge, LA 70803, USA.
| | - Jaehun Ahn
- School of Urban, Architecture, and Civil Engineering, Pusan National University, Busan 609-735, Korea.
| |
Collapse
|