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Sidiropoulou E, Skoufos I, Marugan-Hernandez V, Giannenas I, Bonos E, Aguiar-Martins K, Lazari D, Blake DP, Tzora A. In vitro Anticoccidial Study of Oregano and Garlic Essential Oils and Effects on Growth Performance, Fecal Oocyst Output, and Intestinal Microbiota in vivo. Front Vet Sci 2020; 7:420. [PMID: 32851011 PMCID: PMC7411182 DOI: 10.3389/fvets.2020.00420] [Citation(s) in RCA: 30] [Impact Index Per Article: 7.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/03/2020] [Accepted: 06/11/2020] [Indexed: 01/01/2023] Open
Abstract
This study investigated the in vitro effects of Greek oregano and garlic essential oils on inhibition of Eimeria parasites and their in vivo effects on production performance, intestinal bacteria counts, and oocyst output. An inhibition assay was performed in vitro using Eimeria tenella Wisconsin strain sporozoites and Madin-Darby bovine kidney (MDBK) cells. Intracellular sporozoite invasion was quantified by detection of E. tenella DNA using qPCR from cell monolayers harvested at 2 and 24 h post-infection. Parasite invasion was inhibited by the oregano essential oil at the concentration of 100 μg/ml by 83 or 93% after 2 or 24 h, respectively. Garlic essential oil reached a maximum inhibition of 70% after 24 h with the 50 μg/ml concentration. Normal morphology was observed in MDBK cells exposed to concentrations of 100 μl/ml of garlic or oregano for over 24 h. In the in vivo trial, 180 male broiler chicks (45.3 ± 0.7 g) were allocated into two treatments (6 pens of 15 chicks per treatment). Control treatment was fed commercial diets without antibiotics or anticoccidials. The ORE-GAR treatment was fed the same control diets, further supplemented with a premix (1 g/kg feed) containing the oregano (50 g/kg premix) and garlic (5 g/kg premix) essential oils. At day 37, all birds were slaughtered under commercial conditions, and intestinal samples were collected. ORE-GAR treatment had improved final body weight (1833.9 vs. 1.685.9 g; p < 0.01), improved feed conversion ratio (1.489 vs. 1.569; p < 0.01), and reduced fecal oocyst excretion (day 28: 3.672 vs. 3.989 log oocysts/g, p < 0.01; day 37: 3.475 vs. 4.007 log oocysts/g, p < 0.001). In the caecal digesta, ORE-GAR treatment had lower total anaerobe counts (8.216 vs. 8.824 CFU/g; p < 0.01), whereas in the jejunum digesta the ORE-GAR treatment had higher counts of E. coli (5.030 vs. 3.530 CFU/g; p = 0.01) and Enterobacteriaceae (5.341 vs. 3.829 CFU/g; p < 0.01), and lower counts of Clostridium perfringens (2.555 vs. 2.882 CFU/g; p < 0.01). In conclusion, the combined supplementation of oregano and garlic essential oils had a potent anticoccidial effect in vitro and a growth-promoting effect in broilers reared in the absence of anticoccidial drugs.
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Affiliation(s)
- Erasmia Sidiropoulou
- Laboratory of Nutrition, School of Veterinary Medicine, Faculty of Health Sciences, Aristotle University of Thessaloniki, Thessaloniki, Greece
| | - Ioannis Skoufos
- Laboratory of Animal Production, Nutrition and Biotechnology, Department of Agriculture, School of Agriculture, University of Ioannina, Arta, Greece
| | - Virginia Marugan-Hernandez
- Department of Pathobiology and Population Sciences, Royal Veterinary College, University of London, Hertfordshire, United Kingdom
| | - Ilias Giannenas
- Laboratory of Nutrition, School of Veterinary Medicine, Faculty of Health Sciences, Aristotle University of Thessaloniki, Thessaloniki, Greece
| | - Eleftherios Bonos
- Laboratory of Animal Production, Nutrition and Biotechnology, Department of Agriculture, School of Agriculture, University of Ioannina, Arta, Greece
| | - Kelsilandia Aguiar-Martins
- Department of Pathobiology and Population Sciences, Royal Veterinary College, University of London, Hertfordshire, United Kingdom
| | - Diamanto Lazari
- Laboratory of Pharmacognosy, School of Pharmacy, Faculty of Health Sciences, Aristotle University of Thessaloniki, Thessaloniki, Greece
| | - Damer P. Blake
- Department of Pathobiology and Population Sciences, Royal Veterinary College, University of London, Hertfordshire, United Kingdom
| | - Athina Tzora
- Laboratory of Animal Production, Nutrition and Biotechnology, Department of Agriculture, School of Agriculture, University of Ioannina, Arta, Greece
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52
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Lee HJ, Kim HJ, Park DG, Jin KS, Chang JW, Lee HY. Mechanism for Transition of Reverse Cylindrical Micelles to Spherical Micelles Induced by Diverse Alcohols. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2020; 36:8174-8183. [PMID: 32597190 DOI: 10.1021/acs.langmuir.0c01246] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/11/2023]
Abstract
Herein, the effects of various alcohols on lecithin/CaCl2 organogels are investigated. Mixtures of lecithin and CaCl2 form reverse cylindrical micelles, resulting in optically transparent organogels. The addition of various alcohols to a mixture of lecithin and CaCl2 induces a decrease in viscosity through which reverse cylindrical micelles are transformed into spherical micelles (or short cylindrical micelles). Long-hydrocarbon-chain alcohols decrease the viscosity of lecithin/CaCl2 mixtures more efficiently. Hydrogen bonding and hydrocarbon chain interactions between lecithin and alcohol play important roles in the morphological transition. More importantly, isothermal titration calorimetry was conducted to obtain thermodynamic variables such as the enthalpy, equilibrium constant, Gibbs free energy, entropy, and stoichiometry of the associated molecules observed in the transition. It was found that the transition is an entropically driven process, in which the endothermic and exothermic behaviors were observed depending on the hydrocarbon chain length in the alcohol. In addition, the enthalpy for the association of the alcohol with lecithin showed a linear relationship depending on the hydrocarbon chain length, in which the magnitude of hydrogen bonding and hydrocarbon chain interactions was obtained quantitatively. To the best of our knowledge, this is the first study reporting the thermodynamic properties of the morphological transition observed in a reverse self-assembly process.
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Affiliation(s)
- Hwa-Jin Lee
- Department of Chemical Engineering, The Kumoh National Institute of Technology, 61, Daehak-ro, Gumi-si, Gyeongsangbuk-do 39177, Republic of Korea
| | - Hyun-Jin Kim
- Department of Chemical Engineering, The Kumoh National Institute of Technology, 61, Daehak-ro, Gumi-si, Gyeongsangbuk-do 39177, Republic of Korea
| | - Da-Gyun Park
- Department of Chemical Engineering, The Kumoh National Institute of Technology, 61, Daehak-ro, Gumi-si, Gyeongsangbuk-do 39177, Republic of Korea
| | - Kyeong Sik Jin
- Pohang Accelerator Laboratory, Pohang University of Science and Technology, 80 Jigokro-127-beongil, Nam-Gu, Pohang, Kyungbuk 37673, Republic of Korea
| | - Ji Woong Chang
- Department of Chemical Engineering, The Kumoh National Institute of Technology, 61, Daehak-ro, Gumi-si, Gyeongsangbuk-do 39177, Republic of Korea
| | - Hee-Young Lee
- Department of Chemical Engineering, The Kumoh National Institute of Technology, 61, Daehak-ro, Gumi-si, Gyeongsangbuk-do 39177, Republic of Korea
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53
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Wang C, Cui Y, Qu X. Optimization of electrotransformation (ETF) conditions in lactic acid bacteria (LAB). J Microbiol Methods 2020; 174:105944. [DOI: 10.1016/j.mimet.2020.105944] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/13/2020] [Revised: 05/11/2020] [Accepted: 05/11/2020] [Indexed: 10/24/2022]
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54
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Role of efflux in enhancing butanol tolerance of bacteria. J Biotechnol 2020; 320:17-27. [PMID: 32553531 DOI: 10.1016/j.jbiotec.2020.06.008] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/01/2019] [Revised: 06/02/2020] [Accepted: 06/12/2020] [Indexed: 12/11/2022]
Abstract
N-butanol, a valued solvent and potential fuel extender, could possibly be produced by fermentation using either native producers, i.e. solventogenic Clostridia, or engineered platform organisms such as Escherichia coli or Pseudomonas species, if the main process obstacle, a low final butanol concentration, could be overcome. A low final concentration of butanol is the result of its high toxicity to production cells. Nevertheless, bacteria have developed several mechanisms to cope with this toxicity and one of them is active butanol efflux. This review presents information about a few well characterized butanol efflux pumps from Gram-negative bacteria (P. putida and E. coli) and summarizes knowledge about putative butanol efflux systems in Gram-positive bacteria.
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55
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Kutyła M, Fiedurek J, Gromada A, Jędrzejewski K, Trytek M. Mutagenesis and Adaptation of the Psychrotrophic Fungus Chrysosporium pannorum A-1 as a Method for Improving β-pinene Bioconversion. Molecules 2020; 25:E2589. [PMID: 32498456 PMCID: PMC7321369 DOI: 10.3390/molecules25112589] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/12/2020] [Revised: 05/31/2020] [Accepted: 06/01/2020] [Indexed: 11/17/2022] Open
Abstract
Mutagenesis and adaptation of the psychrotrophic fungus Chrysosporium pannorum A-1 to the toxic substrate β-pinene were used to obtain a biocatalyst with increased resistance to this terpene and improved bioconversion properties. Mutants of the parental strain were induced with UV light and N-methyl-N'-nitro-N-nitrosoguanidine. Mutants resistant to β-pinene were isolated using agar plates with a linear gradient of substrate concentrations. Active mutants were selected based on their general metabolic activity (GMA) expressed as oxygen consumption rate. Compared to the parental strain, the most active mutant showed an enhanced biotransformation ability to convert β-pinene to trans-pinocarveol (315 mg per g of dry mycelium), a 4.3-fold greater biocatalytic activity, and a higher resistance to H2O2-induced oxidative stress. Biotransformation using adapted mutants yielded twice as much trans-pinocarveol as the reaction catalyzed by non-adapted mutants. The results indicate that mutagenesis and adaptation of C. pannorum A-1 is an effective method of enhancing β-bioconversion of terpenes.
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Affiliation(s)
| | | | | | | | - Mariusz Trytek
- Department of Industrial and Environmental Microbiology, Faculty of Biology and Biotechnology, Maria Curie-Skłodowska University, Akademicka 19, 20-033 Lublin, Poland; (M.K.); (J.F.); (A.G.); (K.J.)
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56
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Shon JC, Noh YJ, Kwon YS, Kim JH, Wu Z, Seo JS. The impact of phenanthrene on membrane phospholipids and its biodegradation by Sphingopyxis soli. ECOTOXICOLOGY AND ENVIRONMENTAL SAFETY 2020; 192:110254. [PMID: 32007746 DOI: 10.1016/j.ecoenv.2020.110254] [Citation(s) in RCA: 14] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/07/2019] [Revised: 01/20/2020] [Accepted: 01/26/2020] [Indexed: 06/10/2023]
Abstract
The direct interactions of bacterial membranes and polycyclic aromatic hydrocarbons (PAHs) strongly influence the biological processes, such as metabolic activity and uptake of substrates due to changes in membrane lipids. However, the elucidation of adaptation mechanisms as well as membrane phospholipid alterations in the presence of phenanthrene (PHE) from α-proteobacteria has not been fully explored. This study was conducted to define the degradation efficiency of PHE by Sphingopyxis soli strain KIT-001 in a newly isolated from Jeonju river sediments and to characterize lipid profiles in the presence of PHE in comparison to cells grown on glucose using quantitative lipidomic analysis. This strain was able to respectively utilize 1-hydroxy-2-naphthoic acid and salicylic acid as sole carbon source and approximately 90% of PHE (50 mg/L) was rapidly degraded via naphthalene route within 1 day incubation. In the cells grown on PHE, strain KIT-001 appeared to dynamically change profiles of metabolite and lipid in comparison to cells grown on glucose. The levels of primary metabolites, phosphatidylethanolamines (PE), and phosphatidic acids (PA) were significantly decreased, whereas the levels of phosphatidylcholines (PC) and phosphatidylglycerols (PG) were significantly increased. The adaptation mechanism of Sphingopyxis sp. regarded mainly the accumulation of bilayer forming lipids and anionic lipids to adapt more quickly under restricted nutrition and toxicity condition. Hence, these findings are conceivable that strain KIT-001 has a good adaptive ability and biodegradation for PHE through the alteration of phospholipids, and will be helpful for applications for effective bioremediation of PAHs-contaminated sites.
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Affiliation(s)
- Jong Cheol Shon
- Environmental Chemistry Research Group, Korea Institute of Toxicology, Jinju, 52834, Republic of Korea
| | - Young Ji Noh
- Environmental Chemistry Research Group, Korea Institute of Toxicology, Jinju, 52834, Republic of Korea
| | - Young Sang Kwon
- Environmental Chemistry Research Group, Korea Institute of Toxicology, Jinju, 52834, Republic of Korea
| | - Jong-Hwan Kim
- Environmental Chemistry Research Group, Korea Institute of Toxicology, Jinju, 52834, Republic of Korea
| | - Zhexue Wu
- Mass Spectrometry Convergence Research Institute, Kyungpook National University, Daegu, 41566, Republic of Korea
| | - Jong-Su Seo
- Environmental Chemistry Research Group, Korea Institute of Toxicology, Jinju, 52834, Republic of Korea.
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57
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Hizem A, M’rad S, Oudni-M’rad M, Mezhoud H, Ben Jannet H, Flamini G, Ghedira K, Babba H. In vitro scolicidal activity of Thymus capitatus Hoff. et Link. essential oil on Echinococcus granulosus protoscoleces. JOURNAL OF ESSENTIAL OIL RESEARCH 2020. [DOI: 10.1080/10412905.2019.1711212] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
Affiliation(s)
- Amani Hizem
- Université de Monastir, Faculté de Pharmacie de Monastir, LP3M: Laboratoire de Parasitologie-Mycologie Médicale et Moléculaire, LR 12ES08, Monastir, Tunisie
| | - Selim M’rad
- Université de Monastir, Faculté de Pharmacie de Monastir, LP3M: Laboratoire de Parasitologie-Mycologie Médicale et Moléculaire, LR 12ES08, Monastir, Tunisie
| | - Myriam Oudni-M’rad
- Université de Monastir, Faculté de Pharmacie de Monastir, LP3M: Laboratoire de Parasitologie-Mycologie Médicale et Moléculaire, LR 12ES08, Monastir, Tunisie
| | - Habib Mezhoud
- Université de Monastir, Faculté de Pharmacie de Monastir, LP3M: Laboratoire de Parasitologie-Mycologie Médicale et Moléculaire, LR 12ES08, Monastir, Tunisie
| | - Hichem Ben Jannet
- Laboratoire de Chimie Hétérocyclique, Produits Naturels et Réactivité, Equipe: Chimie Médicinale et Produits Naturels, Faculté des Sciences de Monastir, Université de Monastir, Monastir, Tunisie
| | - Guido Flamini
- Dipartimento di Farmacia, Università di Pisa, Pisa, Italy
- Centro Interdipartimentale di Ricerca “Nutraceutica e Alimentazione per la Salute” Nutrafood, University of Pisa, Pisa, Italy
| | - Kamel Ghedira
- Unité des Substances naturelles bioactives et biotechnologie, UR17 ES49, Faculté de Pharmacie de Monastir, Université de Monastir, Monastir, Tunisie
| | - Hamouda Babba
- Université de Monastir, Faculté de Pharmacie de Monastir, LP3M: Laboratoire de Parasitologie-Mycologie Médicale et Moléculaire, LR 12ES08, Monastir, Tunisie
- Laboratoire B, Centre de maternité EPS F. Bourguiba, Monastir, Tunisie
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58
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Low-Level Organic Solvents Improve Multienzyme Whole-Cell Catalytic Synthesis of Myricetin-7-O-Glucuronide. Catalysts 2019. [DOI: 10.3390/catal9110970] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022] Open
Abstract
Multienzyme whole-cell biocatalysts are preferred in industrial applications, and two major concerns regarding the use of these biocatalysts, cell viability and cell membrane integrity, must be addressed. In this work, the transformation of myricetin to myricetin-7-O-glucuronide catalyzed by an engineered Escherichia coli strain was taken as the model reaction to examine the impacts of low-level organic solvents on whole-cell biocatalysis. Low-level organic solvents (2%, v/v) showed a significant increase (roughly 13-fold) in myricetin-7-O-glucuronide yields. No obvious compromises of cellular viability and integrity were observed by a flow cytometry assay or in the determination of extracellular protein leakage, suggesting the addition of low-level organic solvents accommodates whole E. coli cells. Furthermore, a scaled-up reaction was conducted to test the capability and efficiency of whole-cell catalysis in the presence of organic solvents. This study presents a promising and simple means to enhance the productivity of multienzyme whole-cell catalysis without losing the barrier functions of the cell membrane.
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59
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Vinayavekhin N, Kongchai W, Piapukiew J, Chavasiri W. Aspergillus niger upregulated glycerolipid metabolism and ethanol utilization pathway under ethanol stress. Microbiologyopen 2019; 9:e00948. [PMID: 31646764 PMCID: PMC6957411 DOI: 10.1002/mbo3.948] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/24/2019] [Revised: 09/24/2019] [Accepted: 09/27/2019] [Indexed: 11/26/2022] Open
Abstract
The knowledge of how Aspergillus niger responds to ethanol can lead to the design of strains with enhanced ethanol tolerance to be utilized in numerous industrial bioprocesses. However, the current understanding about the response mechanisms of A. niger toward ethanol stress remains quite limited. Here, we first applied a cell growth assay to test the ethanol tolerance of A. niger strain ES4, which was isolated from the wall near a chimney of an ethanol tank of a petroleum company, and found that it was capable of growing in 5% (v/v) ethanol to 30% of the ethanol‐free control level. Subsequently, the metabolic responses of this strain toward ethanol were investigated using untargeted metabolomics, which revealed the elevated levels of triacylglycerol (TAG) in the extracellular components, and of diacylglycerol, TAG, and hydroxy‐TAG in the intracellular components. Lastly, stable isotope labeling mass spectrometry with ethanol‐d6 showed altered isotopic patterns of molecular ions of lipids in the ethanol‐d6 samples, compared with the nonlabeled ethanol controls, suggesting the ability of A. niger ES4 to utilize ethanol as a carbon source. Together, the studies revealed the upregulation of glycerolipid metabolism and ethanol utilization pathway as novel response mechanisms of A. niger ES4 toward ethanol stress, thereby underlining the utility of untargeted metabolomics and the overall approaches as tools for elucidating new biological insights.
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Affiliation(s)
- Nawaporn Vinayavekhin
- Center of Excellence in Natural Products Chemistry, Department of Chemistry, Faculty of Science, Chulalongkorn University, Bangkok, Thailand.,Biocatalyst and Environmental Biotechnology Research Unit, Faculty of Science, Chulalongkorn University, Bangkok, Thailand
| | - Wimonsiri Kongchai
- Center of Excellence in Natural Products Chemistry, Department of Chemistry, Faculty of Science, Chulalongkorn University, Bangkok, Thailand
| | - Jittra Piapukiew
- Biocatalyst and Environmental Biotechnology Research Unit, Faculty of Science, Chulalongkorn University, Bangkok, Thailand.,Department of Botany, Faculty of Science, Chulalongkorn University, Bangkok, Thailand
| | - Warinthorn Chavasiri
- Center of Excellence in Natural Products Chemistry, Department of Chemistry, Faculty of Science, Chulalongkorn University, Bangkok, Thailand
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60
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Kachur K, Suntres Z. The antibacterial properties of phenolic isomers, carvacrol and thymol. Crit Rev Food Sci Nutr 2019; 60:3042-3053. [PMID: 31617738 DOI: 10.1080/10408398.2019.1675585] [Citation(s) in RCA: 199] [Impact Index Per Article: 39.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
Abstract
Most of the antibacterial activities of essential oils from the Lamiaceae herbaceous plant family thyme and oregano are attributed to their bioactive isomeric monoterpenoid constituents, carvacrol and thymol. Commercially available antibiotics of thymol or carvacrol have not yet been developed but health products have incorporated thymol into their formulations for their antimicrobial properties. Carvacrol and thymol are generally considered safe for consumption and they have been used in dental applications, approved as food flavorings and have been considered as antibacterial additives in food and feed. Many studies have demonstrated that carvacrol and thymol are potent antibacterial agents against both Gram-positive and Gram-negative bacteria. The most frequently reported mechanism of antibacterial action of both isomers involves the disruption of bacterial membrane leading to bacterial lysis and leakage of intracellular contents resulting in death. Other proposed mechanisms of antibacterial action include the inhibition of efflux pumps, prevention in the formation and disruption of preformed biofilms, inhibition of bacterial motility, and inhibition of membrane ATPases. In addition, both isomers have been found to act additively or synergistically with conventional antibiotics important in overcoming the problem of bacteria resistance in food and disease.
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Affiliation(s)
- Karina Kachur
- Department of Biology, Lakehead University, Thunder Bay, Ontario, Canada
| | - Zacharias Suntres
- Department of Biology, Lakehead University, Thunder Bay, Ontario, Canada.,Medical Sciences Division, Northern Ontario School of Medicine, Thunder Bay, Ontario, Canada
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61
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Ma Y, Li Y, Huang C, Tian Y, Hao Z. RETRACTED ARTICLE: Rhamnolipid biosurfactants: functional properties and potential contributions for bioremediation. Biodegradation 2019; 30:363. [PMID: 30357536 DOI: 10.1007/s10532-018-9862-9] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/23/2018] [Accepted: 10/17/2018] [Indexed: 10/28/2022]
Affiliation(s)
- Yanling Ma
- Shaanxi Provincial Key Laboratory of Biotechnology, Key Laboratory of Resources Biology and Biotechnology in Western China, Ministry of Education, College of Life Science, Northwest University, 229 Taibai North Rd, Xi'an, 710069, Shaanxi, China.
| | - Yanpeng Li
- Shaanxi Provincial Key Laboratory of Biotechnology, Key Laboratory of Resources Biology and Biotechnology in Western China, Ministry of Education, College of Life Science, Northwest University, 229 Taibai North Rd, Xi'an, 710069, Shaanxi, China
| | - Chao Huang
- Shaanxi Provincial Key Laboratory of Biotechnology, Key Laboratory of Resources Biology and Biotechnology in Western China, Ministry of Education, College of Life Science, Northwest University, 229 Taibai North Rd, Xi'an, 710069, Shaanxi, China
| | - Yuexin Tian
- Shaanxi Provincial Key Laboratory of Biotechnology, Key Laboratory of Resources Biology and Biotechnology in Western China, Ministry of Education, College of Life Science, Northwest University, 229 Taibai North Rd, Xi'an, 710069, Shaanxi, China
| | - Zhidan Hao
- Shaanxi Provincial Key Laboratory of Biotechnology, Key Laboratory of Resources Biology and Biotechnology in Western China, Ministry of Education, College of Life Science, Northwest University, 229 Taibai North Rd, Xi'an, 710069, Shaanxi, China
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62
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Zhang T, Shi XC, Xia Y, Mai L, Tremblay PL. Escherichia coli adaptation and response to exposure to heavy atmospheric pollution. Sci Rep 2019; 9:10879. [PMID: 31350435 PMCID: PMC6659633 DOI: 10.1038/s41598-019-47427-7] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/16/2018] [Accepted: 07/16/2019] [Indexed: 12/30/2022] Open
Abstract
90% of the world population is exposed to heavy atmospheric pollution. This is a major public health issue causing 7 million death each year. Air pollution comprises an array of pollutants such as particulate matters, ozone and carbon monoxide imposing a multifactorial stress on living cells. Here, Escherichia coli was used as model cell and adapted for 390 generations to atmospheric pollution to assess its long-term effects at the genetic, transcriptomic and physiological levels. Over this period, E. coli evolved to grow faster and acquired an adaptive mutation in rpoB, which encodes the RNA polymerase β subunit. Transcriptomic and biochemical characterization showed alteration of the cell membrane composition resulting in lesser permeability after the adaptation process. A second significant change in the cell wall structure of the adapted strain was the greater accumulation of the exopolysaccharides colanic acid and cellulose in the extracellular fraction. Results also indicated that amino acids homeostasis was involved in E. coli response to atmospheric pollutants. This study demonstrates that adaptive mutation with transformative physiological impact can be fixed in genome after exposure to atmospheric pollution and also provides a comprehensive portrait of the cellular response mechanisms involved.
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Affiliation(s)
- Tian Zhang
- State Key Laboratory of Silicate Materials for Architectures, Wuhan University of Technology, Wuhan, P.R. China.,School of Chemistry, Chemical Engineering and Life Science, Wuhan University of Technology, Wuhan, P.R. China
| | - Xiao-Chen Shi
- State Key Laboratory of Silicate Materials for Architectures, Wuhan University of Technology, Wuhan, P.R. China.,School of Chemistry, Chemical Engineering and Life Science, Wuhan University of Technology, Wuhan, P.R. China
| | - Yangyang Xia
- State Key Laboratory of Advanced Technology for Materials Synthesis and Processing, International School of Materials Science and Engineering, Wuhan University of Technology, Wuhan, P.R. China
| | - Liqiang Mai
- State Key Laboratory of Advanced Technology for Materials Synthesis and Processing, International School of Materials Science and Engineering, Wuhan University of Technology, Wuhan, P.R. China
| | - Pier-Luc Tremblay
- State Key Laboratory of Silicate Materials for Architectures, Wuhan University of Technology, Wuhan, P.R. China. .,School of Chemistry, Chemical Engineering and Life Science, Wuhan University of Technology, Wuhan, P.R. China.
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63
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Kučerka N, Gallová J, Uhríková D. The membrane structure and function affected by water. Chem Phys Lipids 2019; 221:140-144. [DOI: 10.1016/j.chemphyslip.2019.04.002] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/22/2018] [Revised: 04/01/2019] [Accepted: 04/01/2019] [Indexed: 01/24/2023]
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64
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Modulation of Fatty Acid Composition of Aspergillus oryzae in Response to Ethanol Stress. Microorganisms 2019; 7:microorganisms7060158. [PMID: 31159383 PMCID: PMC6616634 DOI: 10.3390/microorganisms7060158] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/23/2019] [Revised: 05/20/2019] [Accepted: 05/24/2019] [Indexed: 11/16/2022] Open
Abstract
The koji mold Aspergillus oryzae is widely adopted for producing rice wine, wherein koji mold saccharifies rice starch and sake yeast ferments glucose to ethanol. During rice wine brewing, the accumulating ethanol becomes a major source of stress for A. oryzae, and there is a decline in hydrolysis efficiency. However, the protective mechanisms of A. oryzae against ethanol stress are poorly understood. In the present study, we demonstrate that ethanol adversity caused a significant inhibition of mycelium growth and conidia formation in A. oryzae, and this suppressive effect increased with ethanol concentration. Transmission electron microscopy analysis revealed that ethanol uptake triggered internal cellular perturbations, such as irregular nuclei and the aggregation of scattered vacuoles in A. oryzae cells. Metabolic analysis uncovered an increase in fatty acid unsaturation under high ethanol conditions, in which a large proportion of stearic acid was converted into linoleic acid, and the expression of related fatty acid desaturases was activated. Our results therefore improve the understanding of ethanol adaptation mechanisms in A. oryzae and offer target genes for ethanol tolerance enhancement via genetic engineering.
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65
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Thielmann J, Muranyi P. Review on the chemical composition of Litsea cubeba essential oils and the bioactivity of its major constituents citral and limonene. JOURNAL OF ESSENTIAL OIL RESEARCH 2019. [DOI: 10.1080/10412905.2019.1611671] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
Affiliation(s)
- J. Thielmann
- Retention of Food Quality, Fraunhofer Institute for Process Engineering and Packaging IVV, Freising, German
- Chair of food packaging technology, Technical University of Munich TUM, Munich, Germany
| | - P. Muranyi
- Chair of food packaging technology, Technical University of Munich TUM, Munich, Germany
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Kondakova T, Cronan JE. Transcriptional regulation of fatty acid cis-trans isomerization in the solvent-tolerant soil bacterium, Pseudomonas putida F1. Environ Microbiol 2019; 21:1659-1676. [PMID: 30702193 PMCID: PMC7357427 DOI: 10.1111/1462-2920.14546] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/12/2018] [Revised: 01/21/2019] [Accepted: 01/25/2019] [Indexed: 12/12/2022]
Abstract
One key to the success of Pseudomonas spp. is their ability to reside in hostile environments. Pseudomonas spp. possess a cis-trans isomerase (Cti) an enzyme that converts the cis-unsaturated fatty acids (FAs) of the membrane lipids to their trans-isomers to rigidify the membrane and thereby resist stresses. Whereas the posttranslational Cti regulation has been previously reported, transcriptional cti regulation remains to be studied in more details. Here, we have studied cti transcriptional regulation in the solvent-tolerant strain Pseudomonas putida F1. Two cti transcriptional start sites (cti-279 and cti-77) were identified with cti-279 transcript being dominant. Expression of cti was found to increase with temperature increase, addition of the organic solvent, octanol and in the stationary growth phase. We found that cti expression was repressed by the cyclic-AMP receptor protein (Crp) and repression required the cyclic-AMP ligand of Crp. Production of trans-unsaturated FAs was found to decrease after 24 h of growth. Although this decrease was accompanied by an increase in cyclopropane FA content, this was not at the expense of trans-unsaturated FAs demonstrating the absence of competition between Cti and Cfa in FA modification.
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Affiliation(s)
- Tatiana Kondakova
- Department of Microbiology, University of Illinois, Urbana, IL 61801, USA
| | - John E. Cronan
- Department of Microbiology, University of Illinois, Urbana, IL 61801, USA
- Department of Biochemistry, University of Illinois, Urbana, IL 61801, USA
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Eberlein C, Starke S, Doncel ÁE, Scarabotti F, Heipieper HJ. Quantification of outer membrane vesicles: a potential tool to compare response in Pseudomonas putida KT2440 to stress caused by alkanols. Appl Microbiol Biotechnol 2019; 103:4193-4201. [PMID: 30972462 DOI: 10.1007/s00253-019-09812-0] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/14/2019] [Revised: 03/29/2019] [Accepted: 03/31/2019] [Indexed: 11/29/2022]
Abstract
The bacterial release of outer membrane vesicles (OMVs) is an important physiological mechanism of Gram-negative bacteria playing numerous key roles. One function of the release of OMVs is related to an increase in surface hydrophobicity. This phenomenon initiates biofilm formation, making bacteria more tolerant to environmental stressors. Recently, it was qualitatively shown for Pseudomonas putida that vesicle formation plays a crucial role in multiple stress responses. Yet, no quantification of OMVs for certain stress scenarios has been conducted. In this study, it is shown that the quantification of OMVs can serve as a simple and feasible tool, which allows a comparison of vesicle yields for different experimental setups, cell densities, and environmental stressors. Moreover, the obtained results provide insight to the underlying mechanism of vesicle formation as it was observed that n-alkanols, with a chain length of C7 and longer, caused a distinct and steep increase in vesiculation (12-19-fold), compared to shorter chain n-alkanols (2-4-fold increase).
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Affiliation(s)
- Christian Eberlein
- Department of Environmental Biotechnology, Helmholtz Centre for Environmental Research - UFZ, Permoserstr. 15, 04318, Leipzig, Germany
| | - Stephan Starke
- Department of Environmental Biotechnology, Helmholtz Centre for Environmental Research - UFZ, Permoserstr. 15, 04318, Leipzig, Germany
| | - Álvaro Escobar Doncel
- Department of Environmental Biotechnology, Helmholtz Centre for Environmental Research - UFZ, Permoserstr. 15, 04318, Leipzig, Germany
| | - Francesco Scarabotti
- Department of Environmental Biotechnology, Helmholtz Centre for Environmental Research - UFZ, Permoserstr. 15, 04318, Leipzig, Germany
| | - Hermann J Heipieper
- Department of Environmental Biotechnology, Helmholtz Centre for Environmental Research - UFZ, Permoserstr. 15, 04318, Leipzig, Germany.
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68
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The effect of organic solvents on selected microorganisms and model liposome membrane. Mol Biol Rep 2019; 46:3225-3232. [PMID: 30937654 DOI: 10.1007/s11033-019-04782-y] [Citation(s) in RCA: 56] [Impact Index Per Article: 11.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/07/2018] [Accepted: 03/21/2019] [Indexed: 12/19/2022]
Abstract
The effect of methanol, ethanol, acetone, N,N-dimethylformamide (DMF), dimethyl sulfoxide and Nujol on the growth of Escherichia coli DH5α, Bacillus subtilis and Saccharomyces cerevisiae D273 was investigated. All of the tested cultures appeared susceptible to the organic media they were treated with, which evinced in apparent hindering of cell development. The observed diverse solvent tolerance, except from their different biochemical activity, may also be related to the changes in cell membrane fluidity induced by the solvent species. Parallel electron paramagnetic resonance investigations using egg yolk lecithin model liposomes revealed that the fluidity of the phospholipid system in cell membranes may either be considerably decreased (Nujol, DMF, ethanol) or increased (acetone), thus rendering difficult the intracellular nutrient supply. Hence, even the chemically neutral Nujol produced a distinct cell-growth inhibitory effect. These results are fairly consistent with the outcome of the survival tests, particularly for the bacteria strains.
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69
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Cheng L, Zhang X, Zheng X, Wu Z, Weng P. RNA-seq transcriptomic analysis of green tea polyphenols regulation of differently expressed genes in Saccharomyces cerevisiae under ethanol stress. World J Microbiol Biotechnol 2019; 35:59. [PMID: 30915597 DOI: 10.1007/s11274-019-2639-4] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/06/2018] [Accepted: 03/19/2019] [Indexed: 11/24/2022]
Abstract
Saccharomyces cerevisiae has been widely used to produce alcoholic beverages and bio-fuels; however, its performance is remarkably compromised by the increased ethanol concentration during the fermentation process. In this study, RNA-sequence analysis was used to investigate the protective effect of green tea polyphenols (GTP) on S. cerevisiae cells from ethanol-induced damage. GO and KEGG analysis showed that to deal with the stress of ethanol, large amounts of genes related to cell wall, cell membrane, basic metabolism and redox regulation were significantly differentially expressed (P < 0.05), while these undesired changes could be partly relieved by administration of GTP, suggesting its potential to enhance the ethanol tolerance of S. cerevisiae. The present study provided a global view of the transcriptomic changes of S. cerevisiae in response to the accumulation of ethanol and the treatment of GTP, which might deepen our understanding about S. cerevisiae and the fermentation process, and thus benefit the development of the bioethanol production industry.
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Affiliation(s)
- Lu Cheng
- Department of Food Science, Rutgers University, New Brunswick, NJ, 08901, USA
| | - Xin Zhang
- Department of Food Science and Engineering, Ningbo University, Ningbo, 315211, People's Republic of China
| | - Xiaojie Zheng
- Department of Agriculture and Biotechnology, Wenzhou Vocational College of Science and Technology, Wenzhou, 325006, People's Republic of China
| | - Zufang Wu
- Department of Food Science and Engineering, Ningbo University, Ningbo, 315211, People's Republic of China
| | - Peifang Weng
- Department of Food Science and Engineering, Ningbo University, Ningbo, 315211, People's Republic of China.
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71
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Park MJ, Park MS, Ji GE. Improvement of electroporation-mediated transformation efficiency for a Bifidobacterium strain to a reproducibly high level. J Microbiol Methods 2018; 159:112-119. [PMID: 30529116 DOI: 10.1016/j.mimet.2018.11.019] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/05/2018] [Revised: 11/26/2018] [Accepted: 11/27/2018] [Indexed: 02/07/2023]
Abstract
Bifidobacteria are representative probiotics which are defined as live microorganisms that confer a health benefit on the host. Because of their safety and healthfulness when applied to humans, bifidobacteria are suitable as genetically engineered bacteria for applications to benefit human physiology and pathology. However, molecular biological studies of bifidobacteria have been limited due to insufficient genetic tools including effective transformation methods. The aim of this study is to improve the electroporation-mediated transformation efficiency of bifidobacteria to a reproducibly high level. The crucial factors that determine electroporation efficiency are the restriction-modification system, together with the cell wall and cell membrane structure of the bacteria. We optimized the bifidobacterial electroporation conditions by focusing on these factors as well as the amount of plasmid DNA used, the electrical parameters and the bacterial growth phase. As a result, the electroporation efficiency of B. bifidum BGN4 drastically and consistently increased from 103 to 105 CFU / μg DNA. The most significant factor for increasing the electroporation efficiency was the cell wall weakening mediated by NaCl, which improved the electroporation frequency by 20 times. Because the optimized electrotransformation conditions reported here should be widely applicable to other Bifidobacterium species, these could promote the extensive genetic manipulation of the various Bifidobacterium species in future studies.
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Affiliation(s)
- Min Ju Park
- Department of Food and Nutrition, Research Institute of Human Ecology, Seoul National University, Seoul 151-742, Republic of Korea
| | - Myeong Soo Park
- Research Center, BIFIDO Co., Ltd, Hongcheon 205-804, Republic of Korea; Department of Hotel Culinary Arts, Yeonsung University, Anyang 430-749, Republic of Korea.
| | - Geun Eog Ji
- Department of Food and Nutrition, Research Institute of Human Ecology, Seoul National University, Seoul 151-742, Republic of Korea; Research Center, BIFIDO Co., Ltd, Hongcheon 205-804, Republic of Korea.
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72
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Oberoi AS, Philip L. Variation in cell surface characteristics and extracellular polymeric substances during the biodegradation of monocyclic and heterocyclic aromatic hydrocarbons in single and multi-substrate systems. ENVIRONMENTAL TECHNOLOGY 2018; 39:3115-3126. [PMID: 28859575 DOI: 10.1080/09593330.2017.1375019] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/18/2016] [Accepted: 08/25/2017] [Indexed: 06/07/2023]
Abstract
The variation in surface characteristics and the composition of extracellular polymeric substances (EPS) of bacterial cells during biodegradation of single and multi-aromatic hydrocarbons was investigated in the present study. The maximum cell surface hydrophobicity (CSH) of 80.1% was observed during the degradation of toluene. Bacterial cells acquired more negative surface charge with an increase in CSH and vice versa. Proteins constituted the major fraction of EPS during biodegradation of benzene and toluene with protein/carbohydrate ratio varying between 2.19 and 3.1. Carbohydrates constituted the major fraction of EPS in the presence of pyridine. A significant variation in cell surface characteristics was observed in multi-substrate systems involving heterocyclic and monocyclic aromatic hydrocarbons. An increase in EPS production (62.89 mg/g) did not facilitate enhanced degradation of hydrophobic substrates in multi-substrate system involving benzothiophene, benzofuran, benzene and toluene. Under toxic conditions, especially at higher concentration of target pollutants, a significant increase in concentration of polysaccharides was observed compared to proteins.
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Affiliation(s)
- Akashdeep Singh Oberoi
- a Environmental and Water Resources Engineering Division, Department of Civil Engineering , IIT Madras , Chennai , India
| | - Ligy Philip
- a Environmental and Water Resources Engineering Division, Department of Civil Engineering , IIT Madras , Chennai , India
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73
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Concha E, Heipieper HJ, Wick LY, Ciudad GA, Navia R. Effects of limonene, n-decane and n-decanol on growth and membrane fatty acid composition of the microalga Botryococcus braunii. AMB Express 2018; 8:189. [PMID: 30488314 PMCID: PMC6262068 DOI: 10.1186/s13568-018-0718-9] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/19/2018] [Accepted: 11/21/2018] [Indexed: 12/15/2022] Open
Abstract
Botryococcus braunii is a promising microalga for the production of biofuels and other chemicals because of its high content of internal lipids and external hydrocarbons. However, due to the very thick cell wall of B. braunii, traditional chemical/physical downstream processing very often is not as effective as expected and requires high amounts of energy. In this cases, the application of two-phase aqueous-organic solvent systems could be an alternative to cultivate microalgae allowing for a simultaneous extraction of the valuable compounds without significant negative effects on cell growth. Two-phase systems have been applied before, however, there are no studies so far on the mechanisms used by microalgae to survive in contact with solvents present as a second-phase. In this study, the effects of the solvents limonene, n-decane and n-decanol on growth of the microalga B. braunii as well as the adaptive cell response in terms of their phospholipid fatty acid contents were analized. A concentration-dependent negative effect of all three solvents on cell growth was observed. Effects were accompanied by changes of the membrane fatty acid composition of the alga as manifested by a decrease of the unsaturation . In addition, an association was found between the solvent hydrophobicity (given as log octanol–water partition coefficient (\documentclass[12pt]{minimal}
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\begin{document}$$\text {P}_{O-W}$$\end{document}PO-W) values) and their toxic effects, whereby n-decanol and n-decane emerged as the most and least toxic solvent respectively. Among the tested solvents, the latter promises to be the most suitable for a two-phase extraction system.
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74
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Shi YG, Zhu YJ, Shao SY, Zhang RR, Wu Y, Zhu CM, Liang XR, Cai WQ. Alkyl Ferulate Esters as Multifunctional Food Additives: Antibacterial Activity and Mode of Action against Escherichia coli in Vitro. JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY 2018; 66:12088-12101. [PMID: 30360622 DOI: 10.1021/acs.jafc.8b04429] [Citation(s) in RCA: 50] [Impact Index Per Article: 8.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/03/2023]
Abstract
This work aims to prepare ferulic acid alkyl esters (FAEs) through the lipase-catalyzed reaction between methyl ferulate and various fatty alcohols in deep eutectic solvents and ascertain their antibacterial activities and mechanisms. Screens of antibacterial effects of FAEs against Escherichia coli ATCC 25922 ( E. coli) and Listeria monocytogenes ATCC 19115 ( L. monocytogenes) revealed that hexyl ferulate (FAC6) exerted excellent bacteriostatic and bactericidal effects on E. coli and L. monocytogenes (minimum inhibitory concentration (MIC): 1.6 and 0.1 mM, minimum bactericidal concentration (MBC): 25.6 and 0.2 mM, respectively). The antibacterial mechanism of FAC6 against E. coli was systematically studied to facilitate its practical use as a food additive with multifunctionalities. The growth and time-kill curves implied the partial cell lysis and inhibition of the growth of E. coli caused by FAC6. The result related to propidium iodide uptake and cell constituents' leakage (K+, proteins, nucleotides, and β-galactosidase) implied that bacterial cytomembranes were substantially compromised by FAC6. Variations on morphology and cardiolipin microdomains and membrane hyperpolarization of cells visually verified that FAC6 induced cell elongation and destructed the cell membrane with cell wall perforation. SDS-PAGE analysis and alterations of fluorescence spectra of bacterial membrane proteins manifested that FAC6 caused significant changes in constitutions and conformation of membrane proteins. Furthermore, it also could bind to minor grooves of E. coli DNA to form complexes. Meanwhile, FAC6 exhibited antibiofilm formation activity. These findings indicated that that FAC6 has promising potential to be developed as a multifunctional food additive.
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Affiliation(s)
- Yu-Gang Shi
- School of Food Science and Biotechnology , Zhejiang Gongshang University , Hangzhou , Zhejiang 310035 , China
- Zhejiang Provincial Collaborative Innovation Center of Food Safety and Nutrition , Zhejiang Gongshang University , Hangzhou , Zhejiang 310035 , China
| | - Yun-Jie Zhu
- School of Food Science and Biotechnology , Zhejiang Gongshang University , Hangzhou , Zhejiang 310035 , China
- Zhejiang Provincial Collaborative Innovation Center of Food Safety and Nutrition , Zhejiang Gongshang University , Hangzhou , Zhejiang 310035 , China
| | - Shi-Yin Shao
- School of Food Science and Biotechnology , Zhejiang Gongshang University , Hangzhou , Zhejiang 310035 , China
- Zhejiang Provincial Collaborative Innovation Center of Food Safety and Nutrition , Zhejiang Gongshang University , Hangzhou , Zhejiang 310035 , China
| | - Run-Run Zhang
- School of Food Science and Biotechnology , Zhejiang Gongshang University , Hangzhou , Zhejiang 310035 , China
- Zhejiang Provincial Collaborative Innovation Center of Food Safety and Nutrition , Zhejiang Gongshang University , Hangzhou , Zhejiang 310035 , China
| | - Yu Wu
- School of Food Science and Biotechnology , Zhejiang Gongshang University , Hangzhou , Zhejiang 310035 , China
- Zhejiang Provincial Collaborative Innovation Center of Food Safety and Nutrition , Zhejiang Gongshang University , Hangzhou , Zhejiang 310035 , China
| | - Chen-Min Zhu
- School of Food Science and Biotechnology , Zhejiang Gongshang University , Hangzhou , Zhejiang 310035 , China
- Zhejiang Provincial Collaborative Innovation Center of Food Safety and Nutrition , Zhejiang Gongshang University , Hangzhou , Zhejiang 310035 , China
| | - Xian-Rui Liang
- Collaborative Innovation Center of Yangtze River Delta Region Green Pharmaceuticals , Zhejiang University of Technology , Hangzhou , Zhejiang 310014 , China
| | - Wen-Qiang Cai
- School of Food Science and Biotechnology , Zhejiang Gongshang University , Hangzhou , Zhejiang 310035 , China
- Zhejiang Provincial Collaborative Innovation Center of Food Safety and Nutrition , Zhejiang Gongshang University , Hangzhou , Zhejiang 310035 , China
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75
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Vinayavekhin N, Vangnai AS. The effects of disruption in membrane lipid biosynthetic genes on 1-butanol tolerance of Bacillus subtilis. Appl Microbiol Biotechnol 2018; 102:9279-9289. [DOI: 10.1007/s00253-018-9298-5] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/13/2018] [Revised: 07/23/2018] [Accepted: 08/02/2018] [Indexed: 01/24/2023]
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76
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Luo J, Song Z, Ning J, Cheng Y, Wang Y, Cui F, Shen Y, Wang M. The ethanol-induced global alteration in Arthrobacter simplex and its mutants with enhanced ethanol tolerance. Appl Microbiol Biotechnol 2018; 102:9331-9350. [DOI: 10.1007/s00253-018-9301-1] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/13/2018] [Revised: 07/22/2018] [Accepted: 08/03/2018] [Indexed: 11/27/2022]
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77
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Pham-Hoang BN, Romero-Guido C, Phan-Thi H, Waché Y. Strategies to improve carotene entry into cells of Yarrowia lipolytica in a goal of encapsulation. J FOOD ENG 2018. [DOI: 10.1016/j.jfoodeng.2017.12.029] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/29/2023]
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78
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Immediate response mechanisms of Gram-negative solvent-tolerant bacteria to cope with environmental stress: cis-trans isomerization of unsaturated fatty acids and outer membrane vesicle secretion. Appl Microbiol Biotechnol 2018; 102:2583-2593. [PMID: 29450619 PMCID: PMC5847196 DOI: 10.1007/s00253-018-8832-9] [Citation(s) in RCA: 78] [Impact Index Per Article: 13.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/08/2017] [Revised: 02/01/2018] [Accepted: 02/02/2018] [Indexed: 11/03/2022]
Abstract
Bacteria have evolved an array of adaptive mechanisms enabling them to survive and grow in the presence of different environmental stresses. These mechanisms include either modifications of the membrane or changes in the overall energy status, cell morphology, and cell surface properties. Long-term adaptations are dependent on transcriptional regulation, the induction of anabolic pathways, and cell growth. However, to survive sudden environmental changes, bacterial short-term responses are essential to keep the cells alive after the occurrence of an environmental stress factor such as heat shock or the presence of toxic organic solvents. Thus far, two main short-term responses are known. On the one hand, a fast isomerization of cis into trans unsaturated fatty leads to a quick rigidification of the cell membrane, a mechanism known in some genera of Gram-negative bacteria. On the other hand, a fast, effective, and ubiquitously present countermeasure is the release of outer membrane vesicles (OMVs) from the cell surface leading to a rapid increase in cell surface hydrophobicity and finally to the formation of cell aggregates and biofilms. These immediate response mechanisms just allow the bacteria to stay physiologically active and to employ long-term responses to assure viability upon changing environmental conditions. Here, we provide insight into the two aforementioned rapid adaptive mechanisms affecting ultimately the cell envelope of Gram-negative bacteria.
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79
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Zhang R, Cao Y, Liu W, Xian M, Liu H. Improving phloroglucinol tolerance and production in Escherichia coli by GroESL overexpression. Microb Cell Fact 2017; 16:227. [PMID: 29258595 PMCID: PMC5735909 DOI: 10.1186/s12934-017-0839-x] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/16/2017] [Accepted: 12/05/2017] [Indexed: 11/21/2022] Open
Abstract
Background Phloroglucinol is an important chemical which has been successfully produced by engineered Escherichia coli. However, the toxicity of phloroglucinol can enormously inhibit E. coli cell growth and viability, and the productivity is still too low and not economically feasible for industrial applications. Therefore, strain tolerance to toxic metabolites remains a key issue during the production of chemicals using biological processes. Results In the present work, we examined the impact of the native GroESL chaperone system with different overexpression levels on phloroglucinol tolerance and production in E. coli. The groESL gene was cloned into an expression vector, of which expression level was regulated by three different promoters (natural, tac and T7 promoter). Strain tolerance was evaluated employing viable cell counts and phloroglucinol production. In comparison with the control strain, all GroESL overexpressing strains showed good characteristics in cell viability and phloroglucinol synthesis. Strain which overexpressed GroESL under tac promoter was found to show the best tolerance in all of those tested, resulting in a 3.19-fold increase in viable cell numbers compared with control strain of agar-plate culture under the condition of 0.7 g/L phloroglucinol, and a 39.5% increase in phloroglucinol production under fed-batch fermentation. This engineered strain finally accumulated phloroglucinol up to 5.3 g/L in the fed-batch cultivation 10 h after induction, and the productivity was 0.53 g/L/h. To date, the highest phloroglucinol production was achieved in this work compared with the previous reports, which is promising to make the bioprocess feasible from the economical point. Conclusions The data show that appropriate expression level of GroESL plays a critical role in improving phloroglucinol tolerance and production in E. coli, and maybe involve in controlling some aspects of the stress response system through upregulation of GroESL. GroESL overexpression is therefore a feasible and efficient approach for improvement of E. coli tolerance. Electronic supplementary material The online version of this article (10.1186/s12934-017-0839-x) contains supplementary material, which is available to authorized users.
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Affiliation(s)
- Rubing Zhang
- CAS Key Laboratory of Bio-Based Materials, Qingdao Institute of Bioenergy and Bioprocess Technology, Chinese Academy of Sciences, Qingdao, 266101, China.,University of Chinese Academy of Sciences, Beijing, 100049, China
| | - Yujin Cao
- CAS Key Laboratory of Bio-Based Materials, Qingdao Institute of Bioenergy and Bioprocess Technology, Chinese Academy of Sciences, Qingdao, 266101, China
| | - Wei Liu
- CAS Key Laboratory of Bio-Based Materials, Qingdao Institute of Bioenergy and Bioprocess Technology, Chinese Academy of Sciences, Qingdao, 266101, China
| | - Mo Xian
- CAS Key Laboratory of Bio-Based Materials, Qingdao Institute of Bioenergy and Bioprocess Technology, Chinese Academy of Sciences, Qingdao, 266101, China.
| | - Huizhou Liu
- CAS Key Laboratory of Bio-Based Materials, Qingdao Institute of Bioenergy and Bioprocess Technology, Chinese Academy of Sciences, Qingdao, 266101, China.
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80
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Tan Z, Khakbaz P, Chen Y, Lombardo J, Yoon JM, Shanks JV, Klauda JB, Jarboe LR. Engineering Escherichia coli membrane phospholipid head distribution improves tolerance and production of biorenewables. Metab Eng 2017; 44:1-12. [DOI: 10.1016/j.ymben.2017.08.006] [Citation(s) in RCA: 58] [Impact Index Per Article: 8.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/17/2017] [Revised: 08/26/2017] [Accepted: 08/29/2017] [Indexed: 12/27/2022]
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81
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Quan Y, Wu H, Yin Z, Fang Y, Yin C. Effect of static magnetic field on trichloroethylene removal in a biotrickling filter. BIORESOURCE TECHNOLOGY 2017; 239:7-16. [PMID: 28500890 DOI: 10.1016/j.biortech.2017.04.121] [Citation(s) in RCA: 21] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/01/2017] [Revised: 04/25/2017] [Accepted: 04/28/2017] [Indexed: 06/07/2023]
Abstract
A laboratory-scale biotrickling filter combined with a magnetic field (MF-BTF) and a single BTF (S-BTF) were set up to treat trichloroethylene (TCE) gas. The influences of phenol alone and NaAc-phenol as co-substrates and different MF intensities were investigated. At low MF intensity, MF-BTF displayed better performance with 0.20g/L of phenol, 53.6-337.1mg/m3 of TCE, and empty bed residence times of 202.5s. The performances followed the order MF-BTF (60.0mT)>MF-BTF (30.0mT)>S-BTF (0mT)>MF-BTF (130.0mT), and the removal efficiencies (REs) and maximum elimination capacities (ECs) corresponded to: 92.2%-45.5%, 2656.8mg/m3h; 89.8%-37.2%, 2169.1mg/m3h; 89.8%-29.8%, 1967.7mg/m3h; 76.0%-20.8%, 1697.1mg/m3h, respectively. High-throughput sequencing indicated that the bacterial diversity was lower, whereas the relative abundances of Acinetobacter, Chryseobacterium, and Acidovorax were higher in MF-BTF. Results confirmed that a proper MF could improve TCE removal performance in BTF.
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Affiliation(s)
- Yue Quan
- Key Laboratory of Natural Resources of Changbai Mountain and Functional Molecules, Ministry of Education, Yanbian University, Yanji 133002, China; Department of Environmental Science, Agricultural College, Yanbian University, Yanji 133002, China
| | - Hao Wu
- Key Laboratory of Natural Resources of Changbai Mountain and Functional Molecules, Ministry of Education, Yanbian University, Yanji 133002, China
| | - Zhenhao Yin
- Analytical and Testing Center, Yanbian University, Yanji 133002, China
| | - Yingyu Fang
- Analytical and Testing Center, Yanbian University, Yanji 133002, China
| | - Chengri Yin
- Key Laboratory of Natural Resources of Changbai Mountain and Functional Molecules, Ministry of Education, Yanbian University, Yanji 133002, China.
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Integration of whole-cell reaction and product isolation: Highly hydrophobic solvents promote in situ substrate supply and simplify extractive product isolation. J Biotechnol 2017; 257:110-117. [DOI: 10.1016/j.jbiotec.2016.11.021] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/12/2016] [Revised: 11/24/2016] [Accepted: 11/24/2016] [Indexed: 11/23/2022]
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83
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Díez L, Solopova A, Fernández-Pérez R, González M, Tenorio C, Kuipers OP, Ruiz-Larrea F. Transcriptome analysis shows activation of the arginine deiminase pathway in Lactococcus lactis as a response to ethanol stress. Int J Food Microbiol 2017. [DOI: 10.1016/j.ijfoodmicro.2017.05.017] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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84
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Milker S, Fink MJ, Oberleitner N, Ressmann AK, Bornscheuer UT, Mihovilovic MD, Rudroff F. Kinetic Modeling of an Enzymatic Redox Cascade In Vivo Reveals Bottlenecks Caused by Cofactors. ChemCatChem 2017. [DOI: 10.1002/cctc.201700573] [Citation(s) in RCA: 22] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
Affiliation(s)
- Sofia Milker
- Institute of Applied Chemistry; TU Wien; Getreidemarkt 9/163-OC 1060 Vienna Austria
| | - Michael J. Fink
- Department of Chemistry and Chemical Biology; Harvard University; 12 Oxford St Cambridge MA 02138 USA
| | - Nikolin Oberleitner
- Institute of Applied Chemistry; TU Wien; Getreidemarkt 9/163-OC 1060 Vienna Austria
| | - Anna K. Ressmann
- Institute of Applied Chemistry; TU Wien; Getreidemarkt 9/163-OC 1060 Vienna Austria
| | - Uwe T. Bornscheuer
- Institute of Biochemistry, Dept. of Biotechnology & Enzyme Catalysis; Greifswald University; Felix-Hausdorff-Str. 4 17489 Greifswald Germany
| | - Marko D. Mihovilovic
- Institute of Applied Chemistry; TU Wien; Getreidemarkt 9/163-OC 1060 Vienna Austria
| | - Florian Rudroff
- Institute of Applied Chemistry; TU Wien; Getreidemarkt 9/163-OC 1060 Vienna Austria
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85
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Kadisch M, Willrodt C, Hillen M, Bühler B, Schmid A. Maximizing the stability of metabolic engineering-derived whole-cell biocatalysts. Biotechnol J 2017; 12. [DOI: 10.1002/biot.201600170] [Citation(s) in RCA: 25] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/22/2016] [Revised: 05/22/2017] [Accepted: 06/08/2017] [Indexed: 12/20/2022]
Affiliation(s)
- Marvin Kadisch
- Department Solar Materials; Helmholtz Centre for Environmental Research - UFZ; Leipzig Germany
| | - Christian Willrodt
- Department Solar Materials; Helmholtz Centre for Environmental Research - UFZ; Leipzig Germany
| | - Michael Hillen
- Department Solar Materials; Helmholtz Centre for Environmental Research - UFZ; Leipzig Germany
| | - Bruno Bühler
- Department Solar Materials; Helmholtz Centre for Environmental Research - UFZ; Leipzig Germany
| | - Andreas Schmid
- Department Solar Materials; Helmholtz Centre for Environmental Research - UFZ; Leipzig Germany
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86
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Evolution of a Biomass-Fermenting Bacterium To Resist Lignin Phenolics. Appl Environ Microbiol 2017; 83:AEM.00289-17. [PMID: 28363966 DOI: 10.1128/aem.00289-17] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/02/2017] [Accepted: 03/24/2017] [Indexed: 02/05/2023] Open
Abstract
Increasing the resistance of plant-fermenting bacteria to lignocellulosic inhibitors is useful to understand microbial adaptation and to develop candidate strains for consolidated bioprocessing. Here, we study and improve inhibitor resistance in Clostridium phytofermentans (also called Lachnoclostridium phytofermentans), a model anaerobe that ferments lignocellulosic biomass. We survey the resistance of this bacterium to a panel of biomass inhibitors and then evolve strains that grow in increasing concentrations of the lignin phenolic, ferulic acid, by automated, long-term growth selection in an anaerobic GM3 automat. Ultimately, strains resist multiple inhibitors and grow robustly at the solubility limit of ferulate while retaining the ability to ferment cellulose. We analyze genome-wide transcription patterns during ferulate stress and genomic variants that arose along the ferulate growth selection, revealing how cells adapt to inhibitors through changes in gene dosage and regulation, membrane fatty acid structure, and the surface layer. Collectively, this study demonstrates an automated framework for in vivo directed evolution of anaerobes and gives insight into the genetic mechanisms by which bacteria survive exposure to chemical inhibitors.IMPORTANCE Fermentation of plant biomass is a key part of carbon cycling in diverse ecosystems. Further, industrial biomass fermentation may provide a renewable alternative to fossil fuels. Plants are primarily composed of lignocellulose, a matrix of polysaccharides and polyphenolic lignin. Thus, when microorganisms degrade lignocellulose to access sugars, they also release phenolic and acidic inhibitors. Here, we study how the plant-fermenting bacterium Clostridium phytofermentans resists plant inhibitors using the lignin phenolic, ferulic acid. We examine how the cell responds to abrupt ferulate stress by measuring changes in gene expression. We evolve increasingly resistant strains by automated, long-term cultivation at progressively higher ferulate concentrations and sequence their genomes to identify mutations associated with acquired ferulate resistance. Our study develops an inhibitor-resistant bacterium that ferments cellulose and provides insights into genomic evolution to resist chemical inhibitors.
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87
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Auesukaree C. Molecular mechanisms of the yeast adaptive response and tolerance to stresses encountered during ethanol fermentation. J Biosci Bioeng 2017; 124:133-142. [PMID: 28427825 DOI: 10.1016/j.jbiosc.2017.03.009] [Citation(s) in RCA: 103] [Impact Index Per Article: 14.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/20/2017] [Accepted: 03/16/2017] [Indexed: 12/28/2022]
Abstract
During ethanol fermentation, yeast cells encounter various stresses including sugar substrates-induced high osmolarity, increased ethanol concentration, oxygen metabolism-derived reactive oxygen species (ROS), and elevated temperature. To cope with these fermentation-associated stresses, appropriate adaptive responses are required to prevent stress-induced cellular dysfunctions and to acquire stress tolerances. This review will focus on the cellular effects of these stresses, molecular basis of the adaptive response to each stress, and the cellular mechanisms contributing to stress tolerance. Since a single stress can cause diverse effects, including specific and non-specific effects, both specific and general stress responses are needed for achieving comprehensive protection. For instance, the high-osmolarity glycerol (HOG) pathway and the Yap1/Skn7-mediated pathways are specifically involved in responses to osmotic and oxidative stresses, respectively. On the other hand, due to the common effect of these stresses on disturbing protein structures, the upregulation of heat shock proteins (HSPs) and trehalose is induced upon exposures to all of these stresses. A better understanding of molecular mechanisms underlying yeast tolerance to these fermentation-associated stresses is essential for improvement of yeast stress tolerance by genetic engineering approaches.
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Affiliation(s)
- Choowong Auesukaree
- Department of Biology, Faculty of Science, Mahidol University, Bangkok 10400, Thailand; Center of Excellence on Environmental Health and Toxicology, CHE, Ministry of Education, Bangkok 10400, Thailand.
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88
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Shao B, Liu Z, Zhong H, Zeng G, Liu G, Yu M, Liu Y, Yang X, Li Z, Fang Z, Zhang J, Zhao C. Effects of rhamnolipids on microorganism characteristics and applications in composting: A review. Microbiol Res 2017; 200:33-44. [PMID: 28527762 DOI: 10.1016/j.micres.2017.04.005] [Citation(s) in RCA: 83] [Impact Index Per Article: 11.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/17/2017] [Revised: 04/01/2017] [Accepted: 04/08/2017] [Indexed: 01/15/2023]
Abstract
Biosurfactant rhmnolipids have been applied in many fields, especially in environmental bioremediation. According to previous researches, many research groups have studied the influence of rhamnolipids on microorganism characteristics and/or its application in composting. In this review, the effects of rhamnolipids on the cell surface properties of microorganisms was discussed firstly, such as cell surface hydrophobicity (CSH), electrical, surface compounds, etc. Moreover, the deeper mechanisms were also discussed, such as the effects of rhamnolipids on the structural characteristics and functional characteristics of the cell membrane, and the effects of rhamnolipids on the related enzymes and genes. Additionally, the application of rhamnolipids in composting was discussed, which is an important way for pollutant biodegradation and resource reutilization. It is believed that rhamnolipids will play more and more important role in composting.
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Affiliation(s)
- Binbin Shao
- College of Environmental Science and Engineering, Hunan University, Changsha 410082, PR China; Key Laboratory of Environmental Biology and Pollution Control (Hunan University), Ministry of Education, Changsha 410082, PR China
| | - Zhifeng Liu
- College of Environmental Science and Engineering, Hunan University, Changsha 410082, PR China; Key Laboratory of Environmental Biology and Pollution Control (Hunan University), Ministry of Education, Changsha 410082, PR China.
| | - Hua Zhong
- College of Environmental Science and Engineering, Hunan University, Changsha 410082, PR China; Key Laboratory of Environmental Biology and Pollution Control (Hunan University), Ministry of Education, Changsha 410082, PR China; State Key Laboratory of Water Resources and Hydropower Engineering Science, Wuhan University, Wuhan, Hubei 430072, PR China.
| | - Guangming Zeng
- College of Environmental Science and Engineering, Hunan University, Changsha 410082, PR China; Key Laboratory of Environmental Biology and Pollution Control (Hunan University), Ministry of Education, Changsha 410082, PR China
| | - Guansheng Liu
- College of Environmental Science and Engineering, Hunan University, Changsha 410082, PR China; Key Laboratory of Environmental Biology and Pollution Control (Hunan University), Ministry of Education, Changsha 410082, PR China
| | - Mingda Yu
- College of Environmental Science and Engineering, Hunan University, Changsha 410082, PR China; Key Laboratory of Environmental Biology and Pollution Control (Hunan University), Ministry of Education, Changsha 410082, PR China
| | - Yang Liu
- College of Environmental Science and Engineering, Hunan University, Changsha 410082, PR China; Key Laboratory of Environmental Biology and Pollution Control (Hunan University), Ministry of Education, Changsha 410082, PR China
| | - Xin Yang
- College of Environmental Science and Engineering, Hunan University, Changsha 410082, PR China; Key Laboratory of Environmental Biology and Pollution Control (Hunan University), Ministry of Education, Changsha 410082, PR China
| | - Zhigang Li
- College of Environmental Science and Engineering, Hunan University, Changsha 410082, PR China; Key Laboratory of Environmental Biology and Pollution Control (Hunan University), Ministry of Education, Changsha 410082, PR China
| | - Zhendong Fang
- College of Environmental Science and Engineering, Hunan University, Changsha 410082, PR China; Key Laboratory of Environmental Biology and Pollution Control (Hunan University), Ministry of Education, Changsha 410082, PR China
| | - Juntao Zhang
- College of Environmental Science and Engineering, Hunan University, Changsha 410082, PR China; Key Laboratory of Environmental Biology and Pollution Control (Hunan University), Ministry of Education, Changsha 410082, PR China
| | - Chenghao Zhao
- College of Environmental Science and Engineering, Hunan University, Changsha 410082, PR China; Key Laboratory of Environmental Biology and Pollution Control (Hunan University), Ministry of Education, Changsha 410082, PR China
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89
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Meyer-Cifuentes I, Martinez-Lavanchy PM, Marin-Cevada V, Böhnke S, Harms H, Müller JA, Heipieper HJ. Isolation and characterization of Magnetospirillum sp. strain 15-1 as a representative anaerobic toluene-degrader from a constructed wetland model. PLoS One 2017; 12:e0174750. [PMID: 28369150 PMCID: PMC5378359 DOI: 10.1371/journal.pone.0174750] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/13/2017] [Accepted: 03/14/2017] [Indexed: 11/23/2022] Open
Abstract
Previously, Planted Fixed-Bed Reactors (PFRs) have been used to investigate microbial toluene removal in the rhizosphere of constructed wetlands. Aerobic toluene degradation was predominant in these model systems although bulk redox conditions were hypoxic to anoxic. However, culture-independent approaches indicated also that microbes capable of anaerobic toluene degradation were abundant. Therefore, we aimed at isolating anaerobic-toluene degraders from one of these PFRs. From the obtained colonies which consisted of spirilli-shaped bacteria, a strain designated 15–1 was selected for further investigations. Analysis of its 16S rRNA gene revealed greatest similarity (99%) with toluene-degrading Magnetospirillum sp. TS-6. Isolate 15–1 grew with up to 0.5 mM of toluene under nitrate-reducing conditions. Cells reacted to higher concentrations of toluene by an increase in the degree of saturation of their membrane fatty acids. Strain 15–1 contained key genes for the anaerobic degradation of toluene via benzylsuccinate and subsequently the benzoyl-CoA pathway, namely bssA, encoding for the alpha subunit of benzylsuccinate synthase, bcrC for subunit C of benzoyl-CoA reductase and bamA for 6-oxocyclohex-1-ene-1-carbonyl-CoA hydrolase. Finally, most members of a clone library of bssA generated from the PFR had highest similarity to bssA from strain 15–1. Our study provides insights about the physiological capacities of a strain of Magnetospirillum isolated from a planted system where active rhizoremediation of toluene is taking place.
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Affiliation(s)
- Ingrid Meyer-Cifuentes
- Helmholtz Centre for Environmental Research-UFZ, Department of Environmental Biotechnology, Leipzig, Germany
| | - Paula M Martinez-Lavanchy
- Helmholtz Centre for Environmental Research-UFZ, Department of Environmental Biotechnology, Leipzig, Germany
- Technical University of Denmark, Bibliometrics and Data Management, Department for Innovation and Sector Services, Lyngby, Denmark
| | - Vianey Marin-Cevada
- Helmholtz Centre for Environmental Research-UFZ, Department of Environmental Biotechnology, Leipzig, Germany
| | - Stefanie Böhnke
- Helmholtz Centre for Environmental Research-UFZ, Department of Environmental Biotechnology, Leipzig, Germany
| | - Hauke Harms
- Helmholtz Centre for Environmental Research-UFZ, Department of Environmental Microbiology, Leipzig, Germany
| | - Jochen A Müller
- Helmholtz Centre for Environmental Research-UFZ, Department of Environmental Biotechnology, Leipzig, Germany
| | - Hermann J Heipieper
- Helmholtz Centre for Environmental Research-UFZ, Department of Environmental Biotechnology, Leipzig, Germany
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90
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Fiedurek J, Trytek M, Szczodrak J. Strain improvement of industrially important microorganisms based on resistance to toxic metabolites and abiotic stress. J Basic Microbiol 2017; 57:445-459. [DOI: 10.1002/jobm.201600710] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/02/2016] [Accepted: 03/04/2017] [Indexed: 11/06/2022]
Affiliation(s)
- Jan Fiedurek
- Department of Industrial Microbiology; Institute of Microbiology and Biotechnology; Maria Curie-Skłodowska University; Lublin Poland
| | - Mariusz Trytek
- Department of Industrial Microbiology; Institute of Microbiology and Biotechnology; Maria Curie-Skłodowska University; Lublin Poland
| | - Janusz Szczodrak
- Department of Industrial Microbiology; Institute of Microbiology and Biotechnology; Maria Curie-Skłodowska University; Lublin Poland
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91
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Wu J, Lu H, Zhu G, Chen L, Chang Y, Yu R. Regulation of membrane fixation and energy production/conversion for adaptation and recovery of ZnO nanoparticle impacted Nitrosomonas europaea. Appl Microbiol Biotechnol 2017; 101:2953-2965. [DOI: 10.1007/s00253-017-8092-0] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/12/2016] [Revised: 12/09/2016] [Accepted: 12/21/2016] [Indexed: 11/24/2022]
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92
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Protective role of glutathione addition against wine-related stress in Oenococcus oeni. Food Res Int 2016; 90:8-15. [DOI: 10.1016/j.foodres.2016.10.006] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/14/2016] [Revised: 09/30/2016] [Accepted: 10/05/2016] [Indexed: 11/22/2022]
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93
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Leite de Souza E. The effects of sublethal doses of essential oils and their constituents on antimicrobial susceptibility and antibiotic resistance among food-related bacteria: A review. Trends Food Sci Technol 2016. [DOI: 10.1016/j.tifs.2016.07.012] [Citation(s) in RCA: 43] [Impact Index Per Article: 5.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022]
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94
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Pham-Hoang BN, Voilley A, Waché Y. Molecule structural factors influencing the loading of flavoring compounds in a natural-preformed capsule: Yeast cells. Colloids Surf B Biointerfaces 2016; 148:220-228. [PMID: 27606495 DOI: 10.1016/j.colsurfb.2016.08.045] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/30/2016] [Revised: 08/24/2016] [Accepted: 08/25/2016] [Indexed: 12/12/2022]
Abstract
Yeast cells are efficient microcapsules for the encapsulation of flavoring compounds. However, as they are preformed capsules, they have to be loaded with the active. Encapsulation efficiency is to a certain level correlated with LogP. In this study, the effect of structural factors on the encapsulation of amphiphilic flavors was investigated. Homological series of carboxylic acids, ethyl esters, lactones, alcohols and ketones were encapsulated into the yeast Yarrowia lipolytica. Although, in a single homological series, the length of the molecule and thus the LogP were correlated with encapsulation efficiency (EY%), big differences were observable between series. For instance, carboxylic acids and lactones exhibited EY% around 45%-55%, respectively, for compounds bigger than C8 and C6, respectively, whereas ethyl esters reached only about 15-20% for C10 compounds. For a group of various C6-compounds, EY% varied from 4% for hexanal to 45% for hexanoic acid although the LogP of the two compounds was almost similar at 1.9. In total our results point out the importance of the level of polarity and localization of the polar part of the compound in addition to the global hydrophobicity of the molecule. They will be of importance to optimize the encapsulation of mixtures of compounds.
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Affiliation(s)
- Bao Ngoc Pham-Hoang
- UMR Procédés Alimentaires et Microbiologiques A 02.102, AgroSup Dijon/Université de Bourgogne-Franche Comté, 1 Esplanade Erasme, 21000 Dijon, France.
| | - Andrée Voilley
- UMR Procédés Alimentaires et Microbiologiques A 02.102, AgroSup Dijon/Université de Bourgogne-Franche Comté, 1 Esplanade Erasme, 21000 Dijon, France
| | - Yves Waché
- UMR Procédés Alimentaires et Microbiologiques A 02.102, AgroSup Dijon/Université de Bourgogne-Franche Comté, 1 Esplanade Erasme, 21000 Dijon, France
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95
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Roux A, Jackson SN, Muller L, Barbacci D, O’Rourke J, Thanos PK, Volkow ND, Balaban C, Schultz JA, Woods AS. Ethanol Induced Brain Lipid Changes in Mice Assessed by Mass Spectrometry. ACS Chem Neurosci 2016; 7:1148-56. [PMID: 27269520 DOI: 10.1021/acschemneuro.6b00120] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/05/2023] Open
Abstract
Alcohol abuse is a chronic disease characterized by the consumption of alcohol at a level that interferes with physical and mental health and causes serious and persistent changes in the brain. Lipid metabolism is of particular interest due to its high concentration in the brain. Lipids are the main component of cell membranes, are involved in cell signaling, signal transduction, and energy storage. In this study, we analyzed lipid composition of chronically ethanol exposed mouse brains. Juvenile (JUV) and adult (ADU) mice were placed on a daily limited-access ethanol intake model for 52 days. After euthanasia, brains were harvested, and total lipids were extracted from brain homogenates. Samples were analyzed using high resolution mass spectrometry and processed by multivariate and univariate statistical analysis. Significant lipid changes were observed in different classes including sphingolipids, fatty acids, lysophosphatidylcholines, and other glycerophospholipids.
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Affiliation(s)
- Aurelie Roux
- Structural
Biology Unit, NIDA IRP, NIH, Baltimore, Maryland 21224, United States
| | - Shelley N. Jackson
- Structural
Biology Unit, NIDA IRP, NIH, Baltimore, Maryland 21224, United States
| | - Ludovic Muller
- Structural
Biology Unit, NIDA IRP, NIH, Baltimore, Maryland 21224, United States
- University of Pittsburgh, Pittsburgh, Pennsylvania 15260, United States
| | | | - Joseph O’Rourke
- Behavioral
Neuropharmacology and Neuroimaging Lab, Department of Psychology, University of Buffalo, Buffalo, New York 14260, United States
| | - Panayotis K. Thanos
- Behavioral
Neuropharmacology and Neuroimaging Lab, Department of Psychology, University of Buffalo, Buffalo, New York 14260, United States
| | - Nora D. Volkow
- Structural
Biology Unit, NIDA IRP, NIH, Baltimore, Maryland 21224, United States
| | - Carey Balaban
- Departments of Otolaryngology, Neurobiology, Communication Sciences & Disorders, and Bioengineering, University of Pittsburgh, Pittsburgh, Pennsylvania 15260, United States
| | | | - Amina S. Woods
- Structural
Biology Unit, NIDA IRP, NIH, Baltimore, Maryland 21224, United States
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96
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Vacuolar H+-ATPase Protects Saccharomyces cerevisiae Cells against Ethanol-Induced Oxidative and Cell Wall Stresses. Appl Environ Microbiol 2016; 82:3121-3130. [PMID: 26994074 DOI: 10.1128/aem.00376-16] [Citation(s) in RCA: 44] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/04/2016] [Accepted: 03/11/2016] [Indexed: 11/20/2022] Open
Abstract
UNLABELLED During fermentation, increased ethanol concentration is a major stress for yeast cells. Vacuolar H(+)-ATPase (V-ATPase), which plays an important role in the maintenance of intracellular pH homeostasis through vacuolar acidification, has been shown to be required for tolerance to straight-chain alcohols, including ethanol. Since ethanol is known to increase membrane permeability to protons, which then promotes intracellular acidification, it is possible that the V-ATPase is required for recovery from alcohol-induced intracellular acidification. In this study, we show that the effects of straight-chain alcohols on membrane permeabilization and acidification of the cytosol and vacuole are strongly dependent on their lipophilicity. These findings suggest that the membrane-permeabilizing effect of straight-chain alcohols induces cytosolic and vacuolar acidification in a lipophilicity-dependent manner. Surprisingly, after ethanol challenge, the cytosolic pH in Δvma2 and Δvma3 mutants lacking V-ATPase activity was similar to that of the wild-type strain. It is therefore unlikely that the ethanol-sensitive phenotype of vma mutants resulted from severe cytosolic acidification. Interestingly, the vma mutants exposed to ethanol exhibited a delay in cell wall remodeling and a significant increase in intracellular reactive oxygen species (ROS). These findings suggest a role for V-ATPase in the regulation of the cell wall stress response and the prevention of endogenous oxidative stress in response to ethanol. IMPORTANCE The yeast Saccharomyces cerevisiae has been widely used in the alcoholic fermentation industry. Among the environmental stresses that yeast cells encounter during the process of alcoholic fermentation, ethanol is a major stress factor that inhibits yeast growth and viability, eventually leading to fermentation arrest. This study provides evidence for the molecular mechanisms of ethanol tolerance, which is a desirable characteristic for yeast strains used in alcoholic fermentation. The results revealed that straight-chain alcohols induced cytosolic and vacuolar acidification through their membrane-permeabilizing effects. Contrary to expectations, a role for V-ATPase in the regulation of the cell wall stress response and the prevention of endogenous oxidative stress, but not in the maintenance of intracellular pH, seems to be important for protecting yeast cells against ethanol stress. These findings will expand our understanding of the mechanisms of ethanol tolerance and provide promising clues for the development of ethanol-tolerant yeast strains.
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97
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Asenjo F, Olmos A, Henríquez-Piskulich P, Polanco V, Aldea P, Ugalde JA, Trombert AN. Genome sequencing and analysis of the first complete genome of Lactobacillus kunkeei strain MP2, an Apis mellifera gut isolate. PeerJ 2016; 4:e1950. [PMID: 27114887 PMCID: PMC4841242 DOI: 10.7717/peerj.1950] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/19/2015] [Accepted: 03/29/2016] [Indexed: 01/23/2023] Open
Abstract
Background. The honey bee (Apis mellifera) is the most important pollinator in agriculture worldwide. However, the number of honey bees has fallen significantly since 2006, becoming a huge ecological problem nowadays. The principal cause is CCD, or Colony Collapse Disorder, characterized by the seemingly spontaneous abandonment of hives by their workers. One of the characteristics of CCD in honey bees is the alteration of the bacterial communities in their gastrointestinal tract, mainly due to the decrease of Firmicutes populations, such as the Lactobacilli. At this time, the causes of these alterations remain unknown. We recently isolated a strain of Lactobacillus kunkeei (L. kunkeei strain MP2) from the gut of Chilean honey bees. L. kunkeei, is one of the most commonly isolated bacterium from the honey bee gut and is highly versatile in different ecological niches. In this study, we aimed to elucidate in detail, the L. kunkeei genetic background and perform a comparative genome analysis with other Lactobacillus species. Methods. L. kunkeei MP2 was originally isolated from the guts of Chilean A. mellifera individuals. Genome sequencing was done using Pacific Biosciences single-molecule real-time sequencing technology. De novo assembly was performed using Celera assembler. The genome was annotated using Prokka, and functional information was added using the EggNOG 3.1 database. In addition, genomic islands were predicted using IslandViewer, and pro-phage sequences using PHAST. Comparisons between L. kunkeei MP2 with other L. kunkeei, and Lactobacillus strains were done using Roary. Results. The complete genome of L. kunkeei MP2 comprises one circular chromosome of 1,614,522 nt. with a GC content of 36,9%. Pangenome analysis with 16 L. kunkeei strains, identified 113 unique genes, most of them related to phage insertions. A large and unique region of L. kunkeei MP2 genome contains several genes that encode for phage structural protein and replication components. Comparative analysis of MP2 with other Lactobacillus species, identified several unique genes of L. kunkeei MP2 related with metabolism, biofilm generation, survival under stress conditions, and mobile genetic elements (MGEs). Discussion. The presence of multiple mobile genetic elements, including phage sequences, suggest a high degree of genetic variability in L. kunkeei. Its versatility and ability to survive in different ecological niches (bee guts, flowers, fruits among others) could be given by its genetic capacity to change and adapt to different environments. L. kunkeei could be a new source of Lactobacillus with beneficial properties. Indeed, L. kunkeei MP2 could play an important role in honey bee nutrition through the synthesis of components as isoprenoids.
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Affiliation(s)
- Freddy Asenjo
- Centro de Genética y Genómica, Facultad de Medicina, Clinica Alemana Universidad del Desarrollo , Santiago , Chile
| | - Alejandro Olmos
- Centro de Genómica y Bioinformática, Facultad de Ciencias, Universidad Mayor , Santiago , Chile
| | | | - Victor Polanco
- Centro de Genómica y Bioinformática, Facultad de Ciencias, Universidad Mayor, Santiago, Chile; Centro de Estudios Apícolas CEAPI Mayor, Facultad de Ciencias, Universidad Mayor, Santiago, Chile
| | - Patricia Aldea
- Centro de Estudios Apícolas CEAPI Mayor, Facultad de Ciencias, Universidad Mayor , Santiago , Chile
| | - Juan A Ugalde
- Centro de Genética y Genómica, Facultad de Medicina, Clinica Alemana Universidad del Desarrollo , Santiago , Chile
| | - Annette N Trombert
- Centro de Genómica y Bioinformática, Facultad de Ciencias, Universidad Mayor , Santiago , Chile
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98
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Fisetin yeast-based bio-capsules via osmoporation: effects of process variables on the encapsulation efficiency and internalized fisetin content. Appl Microbiol Biotechnol 2016; 100:5547-58. [DOI: 10.1007/s00253-016-7425-8] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/16/2015] [Revised: 02/23/2016] [Accepted: 02/26/2016] [Indexed: 01/04/2023]
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99
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Antioxidant, Antibacterial, and Cytotoxic Activities of the Ethanolic Origanum vulgare Extract and Its Major Constituents. OXIDATIVE MEDICINE AND CELLULAR LONGEVITY 2016; 2016:1404505. [PMID: 27051475 PMCID: PMC4804097 DOI: 10.1155/2016/1404505] [Citation(s) in RCA: 63] [Impact Index Per Article: 7.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 10/05/2015] [Accepted: 02/22/2016] [Indexed: 11/18/2022]
Abstract
Oregano is a perennial shrub that grows in the mountains of the Mediterranean and Euro/Irano-Siberian regions. This study was conducted to identify the major constituents of the ethanolic Origanum vulgare extract and examine the cytotoxic, antioxidant, and antibacterial properties of the extract but more importantly the contribution of its specific major constituent(s) or their combination to the overall extract biological activity. Gas chromatography/mass spectroscopy analysis showed that the extract contained monoterpene hydrocarbons and phenolic compounds, the major ones being carvacrol and thymol and to a lesser extent p-cymene, 1-octacosanol, creosol, and phytol. A549 epithelial cells challenged with the extract showed a concentration-dependent increase in cytotoxicity. A combination of thymol and carvacrol at equimolar concentrations to those present in the extract was less cytotoxic. The A549 cells pretreated with nonlethal extract concentrations protected against hydrogen-peroxide-induced cytotoxicity, an antioxidant effect more effective than the combination of equimolar concentrations of thymol/carvacrol. Inclusion of p-cymene and/or 1-octacosanol did not alter the synergistic antioxidant effects of the carvacrol/thymol mixture. The extract also exhibited antimicrobial properties against Gram-positive and Gram-negative bacterial strains including clinical isolates. In conclusion, the oregano extract has cytotoxic, antioxidant, and antibacterial activities mostly attributed to carvacrol and thymol.
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Antimicrobial potency of single and combined mupirocin and monoterpenes, thymol, menthol and 1,8-cineole against Staphylococcus aureus planktonic and biofilm growth. J Antibiot (Tokyo) 2016; 69:689-96. [DOI: 10.1038/ja.2016.10] [Citation(s) in RCA: 73] [Impact Index Per Article: 9.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/17/2015] [Revised: 01/16/2016] [Accepted: 01/22/2016] [Indexed: 01/13/2023]
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