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Wang L, Tan YS, Chen K, Ntakirutimana S, Liu ZH, Li BZ, Yuan YJ. Global regulator IrrE on stress tolerance: a review. Crit Rev Biotechnol 2024; 44:1439-1459. [PMID: 38246753 DOI: 10.1080/07388551.2023.2299766] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/20/2022] [Revised: 07/25/2023] [Accepted: 08/03/2023] [Indexed: 01/23/2024]
Abstract
Stress tolerance is a vital attribute for all living beings to cope with environmental adversities. IrrE (also named PprI) from Deinococcus radiodurans enhances resistance to extreme radiation stress by functioning as a global regulator, mediating the transcription of genes involved in deoxyribonucleic acid (DNA) damage response (DDR). The expression of IrrE augmented the resilience of various species to heat, radiation, oxidation, osmotic stresses and inhibitors, encompassing bacterial, fungal, plant, and mammalian cells. Moreover, IrrE was employed in a global regulator engineering strategy to broaden its applications in stress tolerance. The regulatory impacts of heterologously expressed IrrE have been investigated at the molecular and systems level, including the regulation of genes, proteins, modules, or pathways involved in DNA repair, detoxification proteins, protective molecules, native regulators and other aspects. In this review, we discuss the regulatory role and mechanism of IrrE in the antiradiation response of D. radiodurans. Furthermore, the applications and regulatory effects of heterologous expression of IrrE to enhance abiotic stress tolerance are summarized in particular.
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Affiliation(s)
- Li Wang
- Frontiers Science Center for Synthetic Biology and Key Laboratory of Systems Bioengineering (Ministry of Education), School of Chemical Engineering and Technology, Tianjin University, Tianjin, PR China
| | - Yong-Shui Tan
- Frontiers Science Center for Synthetic Biology and Key Laboratory of Systems Bioengineering (Ministry of Education), School of Chemical Engineering and Technology, Tianjin University, Tianjin, PR China
| | - Kai Chen
- Frontiers Science Center for Synthetic Biology and Key Laboratory of Systems Bioengineering (Ministry of Education), School of Chemical Engineering and Technology, Tianjin University, Tianjin, PR China
| | - Samuel Ntakirutimana
- Frontiers Science Center for Synthetic Biology and Key Laboratory of Systems Bioengineering (Ministry of Education), School of Chemical Engineering and Technology, Tianjin University, Tianjin, PR China
| | - Zhi-Hua Liu
- Frontiers Science Center for Synthetic Biology and Key Laboratory of Systems Bioengineering (Ministry of Education), School of Chemical Engineering and Technology, Tianjin University, Tianjin, PR China
| | - Bing-Zhi Li
- Frontiers Science Center for Synthetic Biology and Key Laboratory of Systems Bioengineering (Ministry of Education), School of Chemical Engineering and Technology, Tianjin University, Tianjin, PR China
| | - Ying-Jin Yuan
- Frontiers Science Center for Synthetic Biology and Key Laboratory of Systems Bioengineering (Ministry of Education), School of Chemical Engineering and Technology, Tianjin University, Tianjin, PR China
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2
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Iwabuchi N, Takihara H. Alkane-translocated cells of Rhodococcus strains utilize dissolved oxygen in the alkane phase of an aqueous-alkane two-phase culture. Biosci Biotechnol Biochem 2024; 88:979-982. [PMID: 38794895 DOI: 10.1093/bbb/zbae074] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/19/2024] [Accepted: 05/19/2024] [Indexed: 05/26/2024]
Abstract
To clarify the growth mechanisms of Rhodococcus in the alkane phase, we measured oxygen utilization in the alkane phase. The results showed that dissolved oxygen decreased significantly when viable cells were present in the alkane phase. The findings suggested that Rhodococcus strains can grow in alkanes and utilize the resident dissolved oxygen.
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Affiliation(s)
- Noriyuki Iwabuchi
- Laboratory of Molecular Microbiology, Department of Applied Biological Science, College of Bioresource Sciences, Nihon University, Fujisawa, Japan
| | - Hayato Takihara
- Medical AI Center/Bioinformatics Laboratory, Niigata University Graduate School of Medical and Dental Sciences, Niigata, Japan
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3
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Song D, Chen X, Yao H, Kong G, Xu M, Guo J, Sun G. The variations of native plasmids greatly affect the cell surface hydrophobicity of sphingomonads. mSystems 2023; 8:e0086223. [PMID: 37909742 PMCID: PMC10734547 DOI: 10.1128/msystems.00862-23] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/16/2023] [Accepted: 09/26/2023] [Indexed: 11/03/2023] Open
Abstract
IMPORTANCE Microbial cell surface hydrophobicity (CSH) reflects nonspecific adhesion ability and affects various physiological processes, such as biofilm formation and pollutant biodegradation. Understanding the regulation mechanisms of CSH will contribute to illuminating microbial adaptation strategies and provide guidance for controlling CSH artificially to benefit humans. Sphingomonads, a common bacterial group with great xenobiotic-degrading ability, generally show higher CSH than typical Gram-negative bacteria, which plays a positive role in organic pollutant capture and cell colonization. This study verified that the variations of two native plasmids involved in synthesizing outer membrane proteins and polysaccharides greatly affected the CSH of sphingomonads. It is feasible to control their CSH by changing the plasmid copy number and sequences. Additionally, considering that plasmids are likely to evolve faster than chromosomes, the CSH of sphingomonads may evolve quickly to respond to environmental changes. Our results provide valuable insights into the CSH regulation and evolution of sphingomonads.
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Affiliation(s)
- Da Song
- Guangdong Provincial Key Laboratory of Microbial Culture Collection and Application, State Key Laboratory of Applied Microbiology Southern China, Institute of Microbiology, Guangdong Academy of Sciences, Guangzhou, Guangdong, China
- Guangdong Environmental Protection Key Laboratory for Microbiology and Regional Ecological Safety, Institute of Microbiology, Guangdong Academy of Sciences, Guangzhou, Guangdong, China
| | - Xingjuan Chen
- Guangdong Provincial Key Laboratory of Microbial Culture Collection and Application, State Key Laboratory of Applied Microbiology Southern China, Institute of Microbiology, Guangdong Academy of Sciences, Guangzhou, Guangdong, China
- Guangdong Environmental Protection Key Laboratory for Microbiology and Regional Ecological Safety, Institute of Microbiology, Guangdong Academy of Sciences, Guangzhou, Guangdong, China
| | - Hui Yao
- Guangdong Provincial Key Laboratory of Microbial Culture Collection and Application, State Key Laboratory of Applied Microbiology Southern China, Institute of Microbiology, Guangdong Academy of Sciences, Guangzhou, Guangdong, China
- Guangdong Environmental Protection Key Laboratory for Microbiology and Regional Ecological Safety, Institute of Microbiology, Guangdong Academy of Sciences, Guangzhou, Guangdong, China
| | - Guannan Kong
- Guangdong Provincial Key Laboratory of Microbial Culture Collection and Application, State Key Laboratory of Applied Microbiology Southern China, Institute of Microbiology, Guangdong Academy of Sciences, Guangzhou, Guangdong, China
- Guangdong Environmental Protection Key Laboratory for Microbiology and Regional Ecological Safety, Institute of Microbiology, Guangdong Academy of Sciences, Guangzhou, Guangdong, China
| | - Meiying Xu
- Guangdong Provincial Key Laboratory of Microbial Culture Collection and Application, State Key Laboratory of Applied Microbiology Southern China, Institute of Microbiology, Guangdong Academy of Sciences, Guangzhou, Guangdong, China
- Guangdong Environmental Protection Key Laboratory for Microbiology and Regional Ecological Safety, Institute of Microbiology, Guangdong Academy of Sciences, Guangzhou, Guangdong, China
| | - Jun Guo
- Guangdong Provincial Key Laboratory of Microbial Culture Collection and Application, State Key Laboratory of Applied Microbiology Southern China, Institute of Microbiology, Guangdong Academy of Sciences, Guangzhou, Guangdong, China
- Guangdong Environmental Protection Key Laboratory for Microbiology and Regional Ecological Safety, Institute of Microbiology, Guangdong Academy of Sciences, Guangzhou, Guangdong, China
| | - Guoping Sun
- Guangdong Provincial Key Laboratory of Microbial Culture Collection and Application, State Key Laboratory of Applied Microbiology Southern China, Institute of Microbiology, Guangdong Academy of Sciences, Guangzhou, Guangdong, China
- Guangdong Environmental Protection Key Laboratory for Microbiology and Regional Ecological Safety, Institute of Microbiology, Guangdong Academy of Sciences, Guangzhou, Guangdong, China
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4
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Liu Z, Li X, Jin Y, Nan T, Zhao Y, Huang L, Yuan Y. New Evidence for Artemisia absinthium as an Alternative to Classical Antibiotics: Chemical Analysis of Phenolic Compounds, Screening for Antimicrobial Activity. Int J Mol Sci 2023; 24:12044. [PMID: 37569422 PMCID: PMC10418608 DOI: 10.3390/ijms241512044] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/25/2023] [Revised: 07/17/2023] [Accepted: 07/25/2023] [Indexed: 08/13/2023] Open
Abstract
Artemisia absinthium, an important herb of the Artemisia genus, was evaluated in this study for its potential as an alternative to classical antibiotics. The antimicrobial activity of methanol extracts of A. absinthium (MEAA) was evaluated using the broth microdilution method, revealing that A. absinthium exhibited broad-spectrum antibacterial and antifungal activity. Ultra-performance liquid chromatography-quadrupole-time of flight mass spectrometry (UPLC-Q-TOF-MS) was used to analyze the chemical profile of the MEAA, with a focus on flavonoids, quinic acids, and glucaric acids. A total of 90 compounds were identified, 69 of which were described for the first time in A. absinthium. Additionally, a new class of caffeoyl methyl glucaric acids was identified. The main active compounds were quantified and screened for antimicrobial activity. A. absinthium was found to be rich in quinic acids and flavonoids. The screening for antimicrobial activity also revealed that salicylic acid, caffeic acid, casticin, and 3,4-dicaffeoylquinic acid had varying degrees of antimicrobial activity. The acute toxicity of MEAA was examined following OECD guidelines. The administration of 5000 mg/kg bw of MEAA did not result in mortality in male and female mice. Furthermore, there were no observed effects on the visceral organs or general behavior of the mice, demonstrating the good safety of MEAA. This study provides new evidence for the use of A. absinthium as an alternative to classical antibiotics in addressing the problem of bacterial resistance.
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Affiliation(s)
| | | | | | - Tiegui Nan
- State Key Laboratory for Quality Ensurance and Sustainable Use of Dao-di Herbs, National Resource Center for Chinese Materia Medica, China Academy of Chinese Medical Sciences, Beijing 100700, China; (Z.L.)
| | | | | | - Yuan Yuan
- State Key Laboratory for Quality Ensurance and Sustainable Use of Dao-di Herbs, National Resource Center for Chinese Materia Medica, China Academy of Chinese Medical Sciences, Beijing 100700, China; (Z.L.)
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Wang Y, Shen J, Meng F, Lu Z, Lv F, Zhou L, Zhao H. Effects of monolauroyl-galactosylglycerol on membrane fatty acids and properties of Bacillus cereus. Appl Microbiol Biotechnol 2023:10.1007/s00253-023-12567-4. [PMID: 37204449 DOI: 10.1007/s00253-023-12567-4] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/05/2023] [Revised: 03/28/2023] [Accepted: 04/25/2023] [Indexed: 05/20/2023]
Abstract
The purpose of this study was to provide new ideas for the antibacterial mechanism of monolauroyl-galactosylglycerol (MLGG) from the perspective of cell membranes. The changes in cell membrane properties of Bacillus cereus (B. cereus) CMCC 66,301 exposed to different concentrations (1 × MIC (minimum inhibitory concentration), 2 × MIC, 1 × MBC (minimum bacterial concentration)) of MLGG were evaluated. It was found that the lag phase of B. cereus cells was prolonged at low concentration MLGG (1 × MIC and 2 × MIC), while about 2 log CFU/mL reduction in B. cereus populations were observed when exposed to high concentration MLGG (1 × MBC). MLGG treated B. cereus displayed obvious membrane depolarization, while membrane permeability had no change using PI (propidium iodide) staining. Significant increase in the membrane fluidity in response to MLGG exposure occurred, which was consistent with the modification of membrane fatty acids compositions, where the relative content of straight-chain fatty acids (SCFAs) and unsaturated fatty acids (UFAs) increased, while branched-chain fatty acids (BCFAs) decreased significantly. The decreased transition Tm value and cell surface hydrophobicity was also observed. Additionally, effect of MLGG on bacterial membrane compositions were explored at the submolecular level by infrared spectroscopy. Resistance tests of B. cereus to MLGG had demonstrated the advantages of MLGG as a bacteriostatic agent. Collectively, these studies indicate that modifying the fatty acid composition and properties of cellular membranes through MLGG exposure is crucial for inhibiting bacteria growth, providing new insights into the antimicrobial mechanisms of MLGG. KEY POINTS: • Monolauroyl-galactosylglycerol inserted into B. cereus lipid bilayer membrane • Monolauroyl-galactosylglycerol treatment caused B. cereus membrane depolarization • Monolauroyl-galactosylglycerol resulted in B. cereus membrane fatty acids alteration.
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Affiliation(s)
- Ying Wang
- College of Food Science and Technology, Nanjing Agricultural University, Nanjing, 210095, Jiangsu Province, China
| | - Juan Shen
- College of Food Science and Technology, Nanjing Agricultural University, Nanjing, 210095, Jiangsu Province, China
| | - Fanqiang Meng
- College of Food Science and Technology, Nanjing Agricultural University, Nanjing, 210095, Jiangsu Province, China
| | - Zhaoxin Lu
- College of Food Science and Technology, Nanjing Agricultural University, Nanjing, 210095, Jiangsu Province, China
| | - Fengxia Lv
- College of Food Science and Technology, Nanjing Agricultural University, Nanjing, 210095, Jiangsu Province, China
| | - Libang Zhou
- College of Food Science and Technology, Nanjing Agricultural University, Nanjing, 210095, Jiangsu Province, China
| | - Haizhen Zhao
- College of Food Science and Technology, Nanjing Agricultural University, Nanjing, 210095, Jiangsu Province, China.
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Schultes FPJ, Haarmann M, Tischler D, Mügge C. Primary alcohols as substrates or products in whole-cell biocatalysis: Toxicity for Escherichia coli expression strains. MOLECULAR CATALYSIS 2023. [DOI: 10.1016/j.mcat.2023.112979] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 02/04/2023]
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Abstract
Bifidobacteria naturally inhabit diverse environments, including the gastrointestinal tracts of humans and animals. Members of the genus are of considerable scientific interest due to their beneficial effects on health and, hence, their potential to be used as probiotics. By definition, probiotic cells need to be viable despite being exposed to several stressors in the course of their production, storage, and administration. Examples of common stressors encountered by probiotic bifidobacteria include oxygen, acid, and bile salts. As bifidobacteria are highly heterogenous in terms of their tolerance to these stressors, poor stability and/or robustness can hamper the industrial-scale production and commercialization of many strains. Therefore, interest in the stress physiology of bifidobacteria has intensified in recent decades, and many studies have been established to obtain insights into the molecular mechanisms underlying their stability and robustness. By complementing traditional methodologies, omics technologies have opened new avenues for enhancing the understanding of the defense mechanisms of bifidobacteria against stress. In this review, we summarize and evaluate the current knowledge on the multilayered responses of bifidobacteria to stressors, including the most recent insights and hypotheses. We address the prevailing stressors that may affect the cell viability during production and use as probiotics. Besides phenotypic effects, molecular mechanisms that have been found to underlie the stress response are described. We further discuss strategies that can be applied to improve the stability of probiotic bifidobacteria and highlight knowledge gaps that should be addressed in future studies.
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Affiliation(s)
- Marie Schöpping
- Systems Biology, Discovery, Chr. Hansen A/S, Hørsholm, Denmark
- Division of Industrial Biotechnology, Department of Biology and Biological Engineering, Chalmers University of Technology, Gothenburg, Sweden
| | - Ahmad A. Zeidan
- Systems Biology, Discovery, Chr. Hansen A/S, Hørsholm, Denmark
| | - Carl Johan Franzén
- Division of Industrial Biotechnology, Department of Biology and Biological Engineering, Chalmers University of Technology, Gothenburg, Sweden
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8
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Tang Z, Zhang Y, Xiao S, Gao Y, Duan Y, Liu B, Xiong C, Yang Z, Wu Y, Zhou S. Insight into the impacts and mechanisms of ketone stress on the antibiotic resistance in Escherichia coli. ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH INTERNATIONAL 2022; 29:83746-83755. [PMID: 35771331 PMCID: PMC9245865 DOI: 10.1007/s11356-022-21600-4] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 02/17/2022] [Accepted: 06/16/2022] [Indexed: 06/15/2023]
Abstract
Accumulation of toxic organic has posed a substantial pressure on the proliferation of bacterial resistance. While aromatic organics have been demonstrated to enhance the antibiotic resistance in bacteria, no information is yet available on the effects of non-aromatic organics on the variations of bacterial resistance. Here, we investigated the effects of a typical ketone (i.e., methylisobutanone (MIBK)) on the variations of antibiotic resistance in Escherichia coli (E. coli). The results showed that the growth of resistant E. coli under environmental concentration of 50 μg/L MIBK was firstly inhibited as explained by the transient disruption in the cell membrane and then recovered possibly due to the reactive oxygen species. Exposure to 50 μg/L MIBK gradually raised the abundance of representative resistance gene (ampR) in E. coli. In contrast, the high concentration of 50 mg/L MIBK continuously inhibited the growth of resistant E. coli by disrupting cell membrane and notably promoted the proliferation of ampR through enhancing the horizontal transformation and up-regulating the expression of efflux pump gene. These findings provided the first evidence for the evolution of bacterial resistance in response to ketone organics.
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Affiliation(s)
- Zhenping Tang
- Hunan Province Key Laboratory of Pollution Control and Resources Reuse Technology, University of South China, Hengyang, 421001, China
- Hunan Province Key Laboratory of Rare Metal Minerals Exploitation and Geological Disposal of Wastes, University of South China, Hengyang, 421001, China
| | - Yu Zhang
- School of Civil Engineering, University of South China, Hengyang, 421001, China
| | - Shasha Xiao
- School of Civil Engineering, University of South China, Hengyang, 421001, China
| | - Yuanyuan Gao
- Hunan Province Key Laboratory of Rare Metal Minerals Exploitation and Geological Disposal of Wastes, University of South China, Hengyang, 421001, China
| | - Yi Duan
- Hunan Province Key Laboratory of Pollution Control and Resources Reuse Technology, University of South China, Hengyang, 421001, China
- School of Civil Engineering, University of South China, Hengyang, 421001, China
| | - Boyang Liu
- School of Civil Engineering, University of South China, Hengyang, 421001, China
| | - Cong Xiong
- School of Civil Engineering, University of South China, Hengyang, 421001, China
| | - Zhengqing Yang
- School of Civil Engineering, University of South China, Hengyang, 421001, China
| | - Yueyue Wu
- Institute of Pathogenic Biology, Hengyang Medical School, University of South China, Hengyang, 421001, China
| | - Shuai Zhou
- Hunan Province Key Laboratory of Pollution Control and Resources Reuse Technology, University of South China, Hengyang, 421001, China.
- Hunan Province Key Laboratory of Rare Metal Minerals Exploitation and Geological Disposal of Wastes, University of South China, Hengyang, 421001, China.
- School of Civil Engineering, University of South China, Hengyang, 421001, China.
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Glycerol Utilization as a Sole Carbon Source Disrupts the Membrane Architecture and Solventogenesis in Clostridium beijerinckii NCIMB 8052. FERMENTATION-BASEL 2022. [DOI: 10.3390/fermentation8070339] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
Efficient bioconversion of abundant waste glycerol to value-added chemicals calls for a wider range of fermentative workhorses that can catabolize glycerol. In this study, we used quantitative gene expression and solvent profiling, qualitative metabolite analysis, and enzyme activity assays to investigate the factors that limit glycerol utilization as a sole carbon source by Clostridium beijerinckii NCIMB 8052. C. beijerinckii NCIMB 8052 did not produce acetate, acetone and butanol on glycerol. Congruently, the genes encoding the coenzyme A transferase subunits (ctfAB) and bifunctional acetaldehyde-CoA/alcohol dehydrogenase (adhE) were down-regulated up to 135- and 21-fold, respectively, at 12 h in glycerol-grown cells compared to glucose-grown cells. Conversely, NADH-dependent butanol dehydrogenase A (bdhA) was upregulated 2-fold. Glycerol dehydrogenase (gldA) and dihydroxyacetone kinase (subunit dhaK) were upregulated up to 5- and 881-fold, respectively. Glyceraldehyde-3-phosphate dehydrogenase (gapdh) showed mostly similar expression profiles at 12 h on glucose and glycerol. At 24 h, gapdh was downregulated 1.5-fold, while NADP+-dependent gapdh was upregulated up to 1.9-fold. Glycerol-grown cells showed higher or similar activity profiles for all solventogenic enzymes studied, compared to glucose-grown cells. Butyraldehyde (3 g/L) supplementation led to the production of ~0.1 g/L butanol, whilst butyrate (3.5 g/L) supplementation produced 0.7 and 0.5 g/L acetone and butanol, respectively, with glycerol. Further, the long chain saturated fatty acids cyclopentaneundecanoic acid, methyl ester and hexadecanoic acid, butyl ester were detected in glucose- but not in glycerol-grown cells. Collectively, growth on glycerol appears to disrupt synthesis of saturated long chain fatty acids, as well as solventogenesis in C. beijerinckii NCIMB 8052.
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Firoozbakht M, Sepahi AA, Rashedi H, Yazdian F. Investigating the effect of nanoparticle on phenanthrene biodegradation by Labedella gwakjiensis strain KDI. Biodegradation 2022; 33:441-460. [PMID: 35732966 DOI: 10.1007/s10532-022-09991-0] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/15/2021] [Accepted: 06/06/2022] [Indexed: 11/02/2022]
Abstract
Polycyclic aromatic hydrocarbons (PAHs), as persistent organic contaminants, are a major source of concern due to their toxic effect on ecosystems and human health. This study attempted to isolate halotolerant PAHs degrading bacteria from saline oil-contaminated soils. Among the isolates, strain KDI with the highest 16S rRNA gene sequence similarity to Labedella gwakjiensis was able to reduce surface tension (ST) from 65.42 to 26.60 mN m-1 and increase the emulsification index to 81.04%, as a result of significant biosurfactant production. Response Surface Methodology (RSM) analysis was applied to optimize the factors, i.e. PAHs concentration and NaCl concentration as well as to determine the effect of these important variables on PAHs biodegradation. The Carbon Quantum Dots. Iron Oxide (CQDs.Fe3O4) nanoparticles were characterized by several popular analytical techniques, after which the effect of CQD.Fe3O4 nanoparticles on biodegradation was examined. PAHs biodegradation rate and efficiency of strain KDI to degrade PHE in the presence of CQD.Fe3O4 nanoparticles was analyzed by GC. According to the results during biodegradation both the concentration of PAHs and the amount of NaCl were effective. The biodegradation rate significantly increased in the presence of CQD.Fe3O4. The highest biodegradation of PHE occurred in the presence of 0.5 g/L of CQD.Fe3O4 which was 63.63% and 81.77% after 48 and 72 h of incubation. To the best of our knowledge, this is the first report on optimization of PAHs concentration and salinity by RSM and nanobioremediation of PHE using a bacterial strain in the presence of CQD.Fe3O4 nanoparticles.
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Affiliation(s)
- Maryam Firoozbakht
- Department of Biology, Science and Research Branch, Islamic Azad University, Tehran, Iran
| | - Abbas Akhavan Sepahi
- Department of Microbiology, Faculty of Biological Sciences, Islamic Azad University, North Tehran Branch, Tehran, Iran.
| | - Hamid Rashedi
- Department of Biotechnology, School of Chemical Engineering, College of Engineering, University of Tehran, Tehran, Iran
| | - Fatemeh Yazdian
- Department of Life Science Engineering, Faculty of New Science and Technologies, University of Tehran, Tehran, Iran
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Leong J, Shi D, Tan JPK, Yang C, Yang S, Wang Y, Ngow YS, Kng J, Balakrishnan N, Peng SQ, Yeow CS, Periaswamy B, Venkataraman S, Kwa AL, Liu X, Yao H, Yang YY. Potent Antiviral and Antimicrobial Polymers as Safe and Effective Disinfectants for the Prevention of Infections. Adv Healthc Mater 2022; 11:e2101898. [PMID: 34694749 DOI: 10.1002/adhm.202101898] [Citation(s) in RCA: 6] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/08/2021] [Revised: 10/19/2021] [Indexed: 11/06/2022]
Abstract
Disinfection using effective antimicrobials is essential in preventing the spread of infectious diseases. This COVID-19 pandemic has brought the need for effective disinfectants to greater attention due to the fast transmission of SARS-CoV-2. Current active ingredients in disinfectants are small molecules that microorganisms can develop resistance against after repeated long-term use and may penetrate the skin, causing harmful side-effects. To this end, a series of membrane-disrupting polyionenes that contain quaternary ammoniums and varying hydrophobic components is synthesized. They are effective against bacteria and fungi. They are also fast acting against clinically isolated drug resistant strains of bacteria. Formulating them with thickeners and nonionic surfactants do not affect their killing efficiency. These polyionenes are also effective in preventing infections caused by nonenveloped and enveloped viruses. Their effectiveness against mouse coronavirus (i.e., mouse hepatitis virus-MHV) depends on their hydrophobicity. The polyionenes with optimal compositions inactivates MHV completely in 30 s. More importantly, the polyionenes are effective in inhibiting SARS-CoV-2 by >99.999% within 30 s. While they are effective against the microorganisms, they do not cause damage to the skin and have a high oral lethal dose. Overall, these polyionenes are promising active ingredients for disinfection and prevention of viral and microbial infections.
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Affiliation(s)
- Jiayu Leong
- Institute of Bioengineering and Bioimaging 31 Biopolis Way, The Nanos Singapore 138669 Singapore
| | - Danrong Shi
- State Key Laboratory for Diagnosis and Treatment of Infectious Diseases First Affiliated Hospital Zhejiang University School of Medicine 79 Qingchun Road Hangzhou 310003 China
| | - Jeremy Pang Kern Tan
- Institute of Bioengineering and Bioimaging 31 Biopolis Way, The Nanos Singapore 138669 Singapore
| | - Chuan Yang
- Institute of Bioengineering and Bioimaging 31 Biopolis Way, The Nanos Singapore 138669 Singapore
| | - Shengcai Yang
- Institute of Bioengineering and Bioimaging 31 Biopolis Way, The Nanos Singapore 138669 Singapore
| | - Yanming Wang
- Institute of Bioengineering and Bioimaging 31 Biopolis Way, The Nanos Singapore 138669 Singapore
| | - Yeen Shian Ngow
- Department of Pharmacy Singapore General Hospital Outram Road Singapore 169608 Singapore
| | - Jessica Kng
- Institute of Bioengineering and Bioimaging 31 Biopolis Way, The Nanos Singapore 138669 Singapore
| | - Nithiyaa Balakrishnan
- Institute of Bioengineering and Bioimaging 31 Biopolis Way, The Nanos Singapore 138669 Singapore
| | - Shu Qin Peng
- Institute of Bioengineering and Bioimaging 31 Biopolis Way, The Nanos Singapore 138669 Singapore
| | - Chun Siang Yeow
- Institute of Bioengineering and Bioimaging 31 Biopolis Way, The Nanos Singapore 138669 Singapore
| | - Balamurugan Periaswamy
- Institute of Bioengineering and Bioimaging 31 Biopolis Way, The Nanos Singapore 138669 Singapore
| | - Shrinivas Venkataraman
- Institute of Bioengineering and Bioimaging 31 Biopolis Way, The Nanos Singapore 138669 Singapore
| | - Andrea Lay‐Hoon Kwa
- Department of Pharmacy Singapore General Hospital Outram Road Singapore 169608 Singapore
| | - Xiaoli Liu
- State Key Laboratory for Diagnosis and Treatment of Infectious Diseases First Affiliated Hospital Zhejiang University School of Medicine 79 Qingchun Road Hangzhou 310003 China
| | - Hangping Yao
- State Key Laboratory for Diagnosis and Treatment of Infectious Diseases First Affiliated Hospital Zhejiang University School of Medicine 79 Qingchun Road Hangzhou 310003 China
| | - Yi Yan Yang
- Institute of Bioengineering and Bioimaging 31 Biopolis Way, The Nanos Singapore 138669 Singapore
- Department of Orthopaedic Surgery Yong Loo Lin School of Medicine National University of Singapore Singapore 119288 Singapore
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12
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Ferreira BL, Granato D, Nunes IL. Uses of ionic liquids to obtain bioactive compounds: insights from the main international regulations for technological applications. Crit Rev Food Sci Nutr 2022; 63:9217-9232. [PMID: 35467994 DOI: 10.1080/10408398.2022.2067115] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/27/2022]
Abstract
Ionic liquids (IL) are innovative alternative solvents to recover bioactive compounds from plant-based sources to replace toxic volatile organic solvents (VOS). ILs are tailored-made solvents with chemical and thermal stabilities, nonvolatile and noninflammable. Although ILs are versatile, cost-effective, and sustainable solutions, the European Commission (EC) has no current regulation to approve extracts obtained with ILs to be applied in foods. Herein, this paper aims to assess the overview of ILs, regulamentation, applications, and its toxic effects, to be used as solvents for extract different bioactive compounds. Studies have suggested novel applications for ILs, such as 1-butyl-3-methylimidazolium bromide, 1-butyl-3-methylimidazolium chloride, 1-butyl-3-methylimidazolium tetrafluoroborate and others, to obtain bioactive compounds, for instance phenolic compounds, lignans, alkaloids, carotenoids, polysaccharides, using modern approaches as ultrasound and microwave-assisted extraction. New IL methods increase the efficiency of recovering target compounds and decrease the extraction time and VOS consumption regarding the traditional techniques. Furthermore, to promote the large-scale use of IL in foods, it is essential to investigate individually the toxicity of each IL used in the extraction processes, aiming to obtain a GRAS stamp, due to the currently lack of regulamentation.
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Affiliation(s)
- Bruno L Ferreira
- Department of Food Science and Technology, Federal University of Santa Catarina (UFSC), Florianópolis, SC, Brazil
| | - Daniel Granato
- Department of Biological Sciences, Faculty of Science and Engineering, University of Limerick, Limerick, Ireland
| | - Itaciara L Nunes
- Department of Food Science and Technology, Federal University of Santa Catarina (UFSC), Florianópolis, SC, Brazil
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Jia H, Cao S, Wu Y, Zhu W, Luo J, Shen Y, Wang M. Genomewide Transcriptome Responses of Arthrobacter simplex to Cortisone Acetate and its Mutants with Enhanced Δ 1-Dehydrogenation Efficiency. JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY 2021; 69:12773-12784. [PMID: 34694802 DOI: 10.1021/acs.jafc.1c04934] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/13/2023]
Abstract
Due to its superior Δ1-dehydrogenation ability, Arthrobacter simplex has been widely used for the biotransformation of cortisone acetate (CA) into prednisone acetate (PA) in the steroid industry. However, its molecular fundamentals are still unclear. Herein, the genome organization, gene regulation, and previously unreported genes involved in Δ1-dehydrogenation are revealed through genome and transcriptome analysis. A comparative study of transcriptomes of an industrial strain induced by CA or at different biotransformation periods was performed. By overexpression, the roles of six genes in CA conversion were confirmed, among which sufC and hsaA behaved better by reinforcing catalytic enzyme activity and substrate transmembrane transport. Additionally, GroEL endowed cells with the strongest stress tolerance by alleviating oxidative damage and enhancing energy levels. Finally, an optimal strain was created by coexpressing three genes, achieving 46.8 and 70.6% increase in PA amount and productivity compared to the initial values, respectively. Our study expanded the understanding of the Δ1-dehydrogenation mechanism and offered an effective approach for excellent steroid-transforming strains.
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Affiliation(s)
- Hongchen Jia
- Key Laboratory of Industrial Fermentation Microbiology (Tianjin University of Science &Technology), Ministry of Education, Tianjin Key Laboratory of Industrial Microbiology, College of Biotechnology, Tianjin University of Science and Technology, Tianjin 300457, P. R. China
| | - Shuting Cao
- Key Laboratory of Industrial Fermentation Microbiology (Tianjin University of Science &Technology), Ministry of Education, Tianjin Key Laboratory of Industrial Microbiology, College of Biotechnology, Tianjin University of Science and Technology, Tianjin 300457, P. R. China
| | - Yan Wu
- Key Laboratory of Industrial Fermentation Microbiology (Tianjin University of Science &Technology), Ministry of Education, Tianjin Key Laboratory of Industrial Microbiology, College of Biotechnology, Tianjin University of Science and Technology, Tianjin 300457, P. R. China
| | - Wencheng Zhu
- Key Laboratory of Industrial Fermentation Microbiology (Tianjin University of Science &Technology), Ministry of Education, Tianjin Key Laboratory of Industrial Microbiology, College of Biotechnology, Tianjin University of Science and Technology, Tianjin 300457, P. R. China
| | - Jianmei Luo
- Key Laboratory of Industrial Fermentation Microbiology (Tianjin University of Science &Technology), Ministry of Education, Tianjin Key Laboratory of Industrial Microbiology, College of Biotechnology, Tianjin University of Science and Technology, Tianjin 300457, P. R. China
| | - Yanbing Shen
- Key Laboratory of Industrial Fermentation Microbiology (Tianjin University of Science &Technology), Ministry of Education, Tianjin Key Laboratory of Industrial Microbiology, College of Biotechnology, Tianjin University of Science and Technology, Tianjin 300457, P. R. China
| | - Min Wang
- Key Laboratory of Industrial Fermentation Microbiology (Tianjin University of Science &Technology), Ministry of Education, Tianjin Key Laboratory of Industrial Microbiology, College of Biotechnology, Tianjin University of Science and Technology, Tianjin 300457, P. R. China
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Ferreira BL, Junior TK, Block JM, Granato D, Nunes IL. Innovative approach for obtaining phenolic compounds from guava (Psidium guajava L.) coproduct using ionic liquid ultrasound-assisted extraction (IL-UAE). BIOCATALYSIS AND AGRICULTURAL BIOTECHNOLOGY 2021. [DOI: 10.1016/j.bcab.2021.102196] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023]
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15
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Transcriptomic and Metabolomic Responses to Carbon and Nitrogen Sources in Methylomicrobium album BG8. Appl Environ Microbiol 2021; 87:e0038521. [PMID: 33893121 DOI: 10.1128/aem.00385-21] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
Abstract
Methanotrophs use methane as their sole carbon and energy source and represent an attractive platform for converting single-carbon feedstocks into value-added compounds. Optimizing these species for biotechnological applications involves choosing an optimal growth substrate based on an understanding of cellular responses to different nutrients. Although many studies of methanotrophs have examined growth rate, yield, and central carbon flux in cultures grown with different carbon and nitrogen sources, few studies have examined more global cellular responses to different media. Here, we evaluated global transcriptomic and metabolomic profiles of Methylomicrobium album BG8 when grown with methane or methanol as the carbon source and nitrate or ammonium as the nitrogen source. We identified five key physiological changes during growth on methanol: M. album BG8 cultures upregulated transcripts for the Entner-Doudoroff and pentose phosphate pathways for sugar catabolism, produced more ribosomes, remodeled the phospholipid membrane, activated various stress response systems, and upregulated glutathione-dependent formaldehyde detoxification. When using ammonium, M. album BG8 upregulated hydroxylamine dehydrogenase (haoAB) and overall central metabolic activity, whereas when using nitrate, cultures upregulated genes for nitrate assimilation and conversion. Overall, we identified several nutrient source-specific responses that could provide a valuable basis for future research on the biotechnological optimization of these species. IMPORTANCE Methanotrophs are gaining increasing interest for their biotechnological potential to convert single-carbon compounds into value-added products such as industrial chemicals, fuels, and bioplastics. Optimizing these species for biotechnological applications requires a detailed understanding of how cellular activity and metabolism vary across different growth substrates. Although each of the two most commonly used carbon sources (methane or methanol) and nitrogen sources (ammonium or nitrate) in methanotroph growth media have well-described advantages and disadvantages in an industrial context, their effects on global cellular activity remain poorly characterized. Here, we comprehensively describe the transcriptomic and metabolomic changes that characterize the growth of an industrially promising methanotroph strain on multiple combinations of carbon and nitrogen sources. Our results represent a more holistic evaluation of cellular activity than previous studies of core metabolic pathways and provide a valuable basis for the future biotechnological optimization of these species.
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López-Ortega MA, Chavarría-Hernández N, López-Cuellar MDR, Rodríguez-Hernández AI. A review of extracellular polysaccharides from extreme niches: An emerging natural source for the biotechnology. From the adverse to diverse! Int J Biol Macromol 2021; 177:559-577. [PMID: 33609577 DOI: 10.1016/j.ijbiomac.2021.02.101] [Citation(s) in RCA: 29] [Impact Index Per Article: 9.7] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/27/2020] [Revised: 02/11/2021] [Accepted: 02/14/2021] [Indexed: 01/12/2023]
Abstract
Every year, new organisms that survive and colonize adverse environments are discovered and isolated. Those organisms, called extremophiles, are distributed throughout the world, both in aquatic and terrestrial environments, such as sulfurous marsh waters, hydrothermal springs, deep waters, volcanos, terrestrial hot springs, marine saltern, salt lakes, among others. According to the ecosystem inhabiting, extremophiles are categorized as thermophiles, psychrophiles, halophiles, acidophiles, alkalophilic, piezophiles, saccharophiles, metallophiles and polyextremophiles. They have developed chemical adaptation strategies that allow them to maintain their cellular integrity, altering physiology or improving repair capabilities; one of them is the biosynthesis of extracellular polysaccharides (EPS), which constitute a slime and hydrated matrix that keep the cells embedded, protecting from environmental stress (desiccation, salinity, temperature, radiation). EPS have gained interest; they are explored by their unique properties such as structural complexity, biodegradability, biological activities, and biocompatibility. Here, we present a review concerning the biosynthesis, characterization, and potential EPS applications produced by extremophile microorganisms, namely, thermophiles, halophiles, and psychrophiles. A bibliometric analysis was conducted, considering research articles published within the last two decades. Besides, an overview of the culture conditions used for extremophiles, the main properties and multiple potential applications of their EPS is also presented.
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Affiliation(s)
- Mayra Alejandra López-Ortega
- Cuerpo Académico de Biotecnología Agroalimentaria, Instituto de Ciencias Agropecuarias, Universidad Autónoma del Estado de Hidalgo, Av. Universidad km 1, Exhacienda de Aquetzalpa, Tulancingo de Bravo, Hidalgo C.P. 43600, Mexico.
| | - Norberto Chavarría-Hernández
- Cuerpo Académico de Biotecnología Agroalimentaria, Instituto de Ciencias Agropecuarias, Universidad Autónoma del Estado de Hidalgo, Av. Universidad km 1, Exhacienda de Aquetzalpa, Tulancingo de Bravo, Hidalgo C.P. 43600, Mexico
| | - Ma Del Rocío López-Cuellar
- Cuerpo Académico de Biotecnología Agroalimentaria, Instituto de Ciencias Agropecuarias, Universidad Autónoma del Estado de Hidalgo, Av. Universidad km 1, Exhacienda de Aquetzalpa, Tulancingo de Bravo, Hidalgo C.P. 43600, Mexico
| | - Adriana Inés Rodríguez-Hernández
- Cuerpo Académico de Biotecnología Agroalimentaria, Instituto de Ciencias Agropecuarias, Universidad Autónoma del Estado de Hidalgo, Av. Universidad km 1, Exhacienda de Aquetzalpa, Tulancingo de Bravo, Hidalgo C.P. 43600, Mexico.
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Luo JM, Zhu WC, Cao ST, Lu ZY, Zhang MH, Song B, Shen YB, Wang M. Improving Biotransformation Efficiency of Arthrobacter simplex by Enhancement of Cell Stress Tolerance and Enzyme Activity. JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY 2021; 69:704-716. [PMID: 33406824 DOI: 10.1021/acs.jafc.0c06592] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/12/2023]
Abstract
Arthrobacter simplex exhibits excellent Δ1-dehydrogenation ability, but the acquisition of the desirable strain is limited due to lacking of comprehensive genetic manipulation. Herein, a promoter collection for fine-tuning gene expression was achieved. Next, the expression level was enhanced and directed evolution of the global transcriptional factor (IrrE) was applied to enhance cell viability in systems containing more substrate and ethanol, thus contributing to higher production. IrrE promotes a stronger antioxidant defense system, more energy generation, and changed signal transduction. Using a stronger promoter, the enzyme activities were boosted but their positive effects on biotransformation performance were inferior to cell stress tolerance when exposed to challenging systems. Finally, an optimal strain was created by collectively reinforcing cell stress tolerance and catalytic enzyme activity, achieving a yield 261.8% higher relative to the initial situation. Our study provided effective methods for steroid-transforming strains with high efficiency.
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Affiliation(s)
- Jian-Mei Luo
- Key Laboratory of Industrial Fermentation Microbiology (Tianjin University of Science and Technology), Ministry of Education, Tianjin Key Laboratory of Industrial Microbiology, College of Biotechnology, Tianjin University of Science and Technology, Tianjin 300457, P. R. China
| | - Wen-Cheng Zhu
- Key Laboratory of Industrial Fermentation Microbiology (Tianjin University of Science and Technology), Ministry of Education, Tianjin Key Laboratory of Industrial Microbiology, College of Biotechnology, Tianjin University of Science and Technology, Tianjin 300457, P. R. China
| | - Shu-Ting Cao
- Key Laboratory of Industrial Fermentation Microbiology (Tianjin University of Science and Technology), Ministry of Education, Tianjin Key Laboratory of Industrial Microbiology, College of Biotechnology, Tianjin University of Science and Technology, Tianjin 300457, P. R. China
| | - Zhi-Yi Lu
- Key Laboratory of Industrial Fermentation Microbiology (Tianjin University of Science and Technology), Ministry of Education, Tianjin Key Laboratory of Industrial Microbiology, College of Biotechnology, Tianjin University of Science and Technology, Tianjin 300457, P. R. China
| | - Meng-Han Zhang
- Key Laboratory of Industrial Fermentation Microbiology (Tianjin University of Science and Technology), Ministry of Education, Tianjin Key Laboratory of Industrial Microbiology, College of Biotechnology, Tianjin University of Science and Technology, Tianjin 300457, P. R. China
| | - Bo Song
- Key Laboratory of Industrial Fermentation Microbiology (Tianjin University of Science and Technology), Ministry of Education, Tianjin Key Laboratory of Industrial Microbiology, College of Biotechnology, Tianjin University of Science and Technology, Tianjin 300457, P. R. China
| | - Yan-Bing Shen
- Key Laboratory of Industrial Fermentation Microbiology (Tianjin University of Science and Technology), Ministry of Education, Tianjin Key Laboratory of Industrial Microbiology, College of Biotechnology, Tianjin University of Science and Technology, Tianjin 300457, P. R. China
| | - Min Wang
- Key Laboratory of Industrial Fermentation Microbiology (Tianjin University of Science and Technology), Ministry of Education, Tianjin Key Laboratory of Industrial Microbiology, College of Biotechnology, Tianjin University of Science and Technology, Tianjin 300457, P. R. China
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18
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How to outwit nature: Omics insight into butanol tolerance. Biotechnol Adv 2020; 46:107658. [PMID: 33220435 DOI: 10.1016/j.biotechadv.2020.107658] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/07/2020] [Revised: 11/10/2020] [Accepted: 11/13/2020] [Indexed: 12/16/2022]
Abstract
The energy crisis, depletion of oil reserves, and global climate changes are pressing problems of developed societies. One possibility to counteract that is microbial production of butanol, a promising new fuel and alternative to many petrochemical reagents. However, the high butanol toxicity to all known microbial species is the main obstacle to its industrial implementation. The present state of the art review aims to expound the recent advances in modern omics approaches to resolving this insurmountable to date problem of low butanol tolerance. Genomics, transcriptomics, and proteomics show that butanol tolerance is a complex phenomenon affecting multiple genes and their expression. Efflux pumps, stress and multidrug response, membrane transport, and redox-related genes are indicated as being most important during butanol challenge, in addition to fine-tuning of global regulators of transcription (Spo0A, GntR), which may further improve tolerance. Lipidomics shows that the alterations in membrane composition (saturated lipids and plasmalogen increase) are very much species-specific and butanol-related. Glycomics discloses the pleiotropic effect of CcpA, the role of alternative sugar transport, and the production of exopolysaccharides as alternative routes to overcoming butanol stress. Unfortunately, the strain that simultaneously syntheses and tolerates butanol in concentrations that allow its commercialization has not yet been discovered or produced. Omics insight will allow the purposeful increase of butanol tolerance in natural and engineered producers and the effective heterologous expression of synthetic butanol pathways in strains hereditary butanol-resistant up to 3.2 - 4.9% (w/v). Future breakthrough can be achieved by a detailed study of the membrane proteome, of which 21% are proteins with unknown functions.
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19
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Zhao R, Cui Z, Pan B, Li Y, Chen Y, Qu J, Jin P, Zheng Z. Enhanced stability and nitrogen removal efficiency of Klebsiella sp. entrapped in chitosan beads applied in the domestic sewage system. RSC Adv 2020; 10:41078-41087. [PMID: 35519206 PMCID: PMC9057698 DOI: 10.1039/d0ra07732a] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/09/2020] [Accepted: 11/02/2020] [Indexed: 01/19/2023] Open
Abstract
Although numerous denitrifying bacteria have been isolated and characterized, their capacity is seriously compromised by traditional inoculant addition and environmental stress in open bioreactors for wastewater treatment. In this study, a biocompatible material, chitosan, was used as a carrier to immobilize a simultaneously heterotrophic nitrifying-aerobic denitrifying bacterium Klebsiella sp., KSND, for continuous nitrogen removal from domestic wastewater in an open purification tank. The results showed that immobilization had no significant effect on cell viability and was beneficial for the reproduction and adhesion of cells. The entrapped KSND exhibited a slightly higher nitrogen removal efficiency of 90.09% than that of free KSND (87.69%). Subsequently, repeated batch cultivation experiments and analysis of the effects of organic contaminants and metal ions were performed using artificial wastewater and domestic wastewater. The findings revealed that the immobilized KSND beads presented desirable biophysical properties with good mechanical stability, cell viability, and enrichment, remarkable stability in organic contaminants and metal ions, and high efficiency nitrogen removal capacity. In conclusion, the developed immobilized denitrifying bacteria system has great potential for continuous wastewater treatment in open bioreactors.
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Affiliation(s)
- Ruojin Zhao
- School of Environmental & Resource, Zhejiang A & F University Hangzhou 311300 China
| | - Zhiwen Cui
- School of Environmental & Resource, Zhejiang A & F University Hangzhou 311300 China
| | - Biwen Pan
- Zhejiang Shuangliang Sunda Environment co, Ltd Hangzhou 310000 China
| | - Yiyi Li
- Zhejiang Shuangliang Sunda Environment co, Ltd Hangzhou 310000 China
| | - Yinyan Chen
- School of Environmental & Resource, Zhejiang A & F University Hangzhou 311300 China
| | - Jin Qu
- School of Environmental & Resource, Zhejiang A & F University Hangzhou 311300 China
| | - Peng Jin
- College of Agricultural and Food Sciences, Zhejiang A & F University Hangzhou 311300 China
| | - Zhanwang Zheng
- School of Environmental & Resource, Zhejiang A & F University Hangzhou 311300 China
- Zhejiang Shuangliang Sunda Environment co, Ltd Hangzhou 310000 China
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20
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Stancu MM. Biosurfactant production by a Bacillus megaterium strain. Open Life Sci 2020; 15:629-637. [PMID: 33817251 PMCID: PMC7747503 DOI: 10.1515/biol-2020-0068] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/10/2019] [Revised: 06/29/2020] [Accepted: 07/05/2020] [Indexed: 12/16/2022] Open
Abstract
The aim of the present study was to investigate the ability of Bacillus megaterium IBBPo17 (GenBank KX499518) cells to produce biosurfactant when the growth was done in the presence of long-chain n-alkane n-hexadecane on medium supplemented with yeast extract, proteose peptone, starch, or cellulose. B. megaterium IBBPo17 revealed a higher growth in the presence of n-hexadecane when the medium was supplemented with yeast extract, proteose peptone, or starch, compared with cellulose. Biosurfactant production was higher when B. megaterium IBBPo17 was grown in the presence of n-hexadecane on yeast extract, proteose peptone, or starch supplemented medium, compared with biosurfactant produced on cellulose supplemented medium. A direct correlation between cell growth and biosurfactant production was observed. When the growth of B. megaterium IBBPo17 cells was higher, the decrease in pH values of the medium was higher too, and more amount of CO2 was released. Changes in cell morphology, aggregation of the cells in clusters, and biofilm formation were observed when B. megaterium IBBPo17 was grown in the presence of n-hexadecane on medium supplemented with yeast extract, proteose peptone, starch, or cellulose. Due to its physiological abilities, this Gram-positive bacterium could be a promising candidate for the bioremediation of petroleum hydrocarbon polluted environments.
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Affiliation(s)
- Mihaela Marilena Stancu
- Institute of Biology Bucharest of Romanian Academy, 296 Splaiul Independentei, Bucharest, 060031, P.O. Box 56-53, Romania
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21
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Zampolli J, Di Canito A, Manconi A, Milanesi L, Di Gennaro P, Orro A. Transcriptomic Analysis of Rhodococcus opacus R7 Grown on o-Xylene by RNA-Seq. Front Microbiol 2020; 11:1808. [PMID: 32903390 PMCID: PMC7434839 DOI: 10.3389/fmicb.2020.01808] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/05/2020] [Accepted: 07/09/2020] [Indexed: 11/13/2022] Open
Abstract
Xylenes are considered one of the most common hazardous sources of environmental contamination. The biodegradation of these compounds has been often reported, rarer the ability to oxidize the ortho-isomer. Among few o-xylene-degrading bacteria, Rhodococcus opacus R7 is well known for its capability to degrade diverse aromatic hydrocarbons and toxic compounds, including o-xylene as only carbon and energy source. This work shows for the first time the RNA-seq approach to elucidate the genetic determinants involved in the o-xylene degradation pathway in R. opacus R7. Transcriptomic data showed 542 differentially expressed genes that are associated with the oxidation of aromatic hydrocarbons and stress response, osmotic regulation and central metabolism. Gene ontology (GO) enrichment and KEGG pathway analysis confirmed significant changes in aromatic compound catabolic processes, fatty acid metabolism, beta-oxidation, TCA cycle enzymes, and biosynthesis of metabolites when cells are cultured in the presence of o-xylene. Interestingly, the most up-regulated genes belong to the akb gene cluster encoding for the ethylbenzene (Akb) dioxygenase system. Moreover, the transcriptomic approach allowed identifying candidate enzymes involved in R7 o-xylene degradation for their likely participation in the formation of the metabolites that have been previously identified. Overall, this approach supports the identification of several oxidative systems likely involved in o-xylene metabolism confirming that R. opacus R7 possesses a redundancy of sequences that converge in o-xylene degradation through R7 peculiar degradation pathway. This work advances our understanding of o-xylene metabolism in bacteria belonging to Rhodococcus genus and provides a framework of useful enzymes (molecular tools) that can be fruitfully targeted for optimized o-xylene consumption.
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Affiliation(s)
- Jessica Zampolli
- Department of Biotechnology and Biosciences, University of Milano-Bicocca, Milan, Italy
| | - Alessandra Di Canito
- Department of Biotechnology and Biosciences, University of Milano-Bicocca, Milan, Italy
| | - Andrea Manconi
- Institute of Biomedical Technologies, National Research Council, CNR, Milan, Italy
| | - Luciano Milanesi
- Institute of Biomedical Technologies, National Research Council, CNR, Milan, Italy
| | - Patrizia Di Gennaro
- Department of Biotechnology and Biosciences, University of Milano-Bicocca, Milan, Italy
| | - Alessandro Orro
- Institute of Biomedical Technologies, National Research Council, CNR, Milan, Italy
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Richards L, Jarrold A, Bowser T, Stevens GW, Gras SL. Cytochrome P450-mediated N-demethylation of noscapine by whole-cell biotransformation: process limitations and strategies for optimisation. J Ind Microbiol Biotechnol 2020; 47:449-464. [PMID: 32507955 DOI: 10.1007/s10295-020-02283-7] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/17/2020] [Accepted: 05/29/2020] [Indexed: 01/16/2023]
Abstract
Cytochrome P450 enzymes catalyse reactions of significant industrial interest but are underutilised in large-scale bioprocesses due to enzyme stability, cofactor requirements and the poor aqueous solubility and microbial toxicity of typical substrates and products. In this work, we investigate the potential for preparative-scale N-demethylation of the opium poppy alkaloid noscapine by a P450BM3 (CYP102A1) mutant enzyme in a whole-cell biotransformation system. We identify and address several common limitations of whole-cell P450 biotransformations using this model N-demethylation process. Mass transfer into Escherichia coli cells was found to be a major limitation of biotransformation rate and an alternative Gram-positive expression host Bacillus megaterium provided a 25-fold improvement in specific initial rate. Two methods were investigated to address poor substrate solubility. First, a biphasic biotransformation system was developed by systematic selection of potentially biocompatible solvents and in silico solubility modelling using Hansen solubility parameters. The best-performing biphasic system gave a 2.3-fold improvement in final product titre compared to a single-phase system but had slower initial rates of biotransformation due to low substrate concentration in the aqueous phase. The second strategy aimed to improve aqueous substrate solubility using cyclodextrin and hydrophilic polymers. This approach provided a fivefold improvement in initial biotransformation rate and allowed a sixfold increase in final product concentration. Enzyme stability and cell viability were identified as the next parameters requiring optimisation to improve productivity. The approaches used are also applicable to the development of other pharmaceutical P450-mediated biotransformations.
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Affiliation(s)
- Luke Richards
- Department of Chemical Engineering, The University of Melbourne, Parkville, VIC, 3010, Australia
- The Bio21 Molecular Science and Biotechnology Institute, The University of Melbourne, 30 Flemington Rd, Parkville, VIC, 3010, Australia
| | - Ailsa Jarrold
- Sun Pharmaceutical Industries Ltd, Princes Highway, Port Fairy, VIC, 3281, Australia
| | - Tim Bowser
- Impact Science Consulting, Unit 2/52 Swanston St, Heidelberg Heights, VIC, 2081, Australia
| | - Geoffrey W Stevens
- Department of Chemical Engineering, The University of Melbourne, Parkville, VIC, 3010, Australia
| | - Sally L Gras
- Department of Chemical Engineering, The University of Melbourne, Parkville, VIC, 3010, Australia.
- The Bio21 Molecular Science and Biotechnology Institute, The University of Melbourne, 30 Flemington Rd, Parkville, VIC, 3010, Australia.
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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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Peng F, Zhao Y, Li FZ, Ou XY, Zeng YJ, Zong MH, Lou WY. Highly enantioselective resolution of racemic 1-phenyl-1,2-ethanediol to (S)-1-phenyl-1,2-ethanediol by Kurthia gibsonii SC0312 in a biphasic system. J Biotechnol 2020; 308:21-26. [PMID: 31758968 DOI: 10.1016/j.jbiotec.2019.11.012] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/15/2019] [Revised: 11/19/2019] [Accepted: 11/20/2019] [Indexed: 12/20/2022]
Abstract
The asymmetric resolution of racemic 1-phenyl-1,2-ethanediol (PED) to (S)-PED by Kurthia gibsonii SC0312 (K. gibsonii SC0312) was conducted in a biphasic system comprised of an organic solvent and aqueous phosphate buffer. The impacts of organic solvents on the whole cell catalytic activity, metabolic activity, membrane integrity, and material distribution were first evaluated. The results showed that all organic solvents, except for dibutyl phthalate, showed a detrimental effect on the metabolic activity of the cells, especially for those with low log P values. All organic solvents were capable of changing the membrane permeability and membrane integrity of the cells. Moreover, some organic solvents showed a good extraction of the oxidation product. Finally, a high yield of 47.7 % of (S)-PED was obtained by the asymmetric resolution of racemic PED using K. gibsonii SC0312 in a biphasic system under the optimal conditions: racemic PED 120 mM, temperature 35 °C, reaction time 6 h, 180 rpm, and a volume ratio of dibutyl phthalate to aqueous phosphate buffer of 1:1. The optical purity of (S)-PED increased from 51.3 % to >99 %. This work described an efficient approach to improve reaction efficiency, and constructed a highly effective biphasic reaction system for the fabrication of (S)-PED via K. gibsonii SC0312.
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Affiliation(s)
- Fei Peng
- Laboratory of Applied Biocatalysis, School of Food Science and Engineering, South China University of Technology, Guangzhou 510640, Guangdong, China
| | - Ying Zhao
- Laboratory of Applied Biocatalysis, School of Food Science and Engineering, South China University of Technology, Guangzhou 510640, Guangdong, China
| | - Fang-Zhou Li
- Laboratory of Applied Biocatalysis, School of Food Science and Engineering, South China University of Technology, Guangzhou 510640, Guangdong, China
| | - Xiao-Yang Ou
- Laboratory of Applied Biocatalysis, School of Food Science and Engineering, South China University of Technology, Guangzhou 510640, Guangdong, China
| | - Ying-Jie Zeng
- Laboratory of Applied Biocatalysis, School of Food Science and Engineering, South China University of Technology, Guangzhou 510640, Guangdong, China
| | - Min-Hua Zong
- Laboratory of Applied Biocatalysis, School of Food Science and Engineering, South China University of Technology, Guangzhou 510640, Guangdong, China
| | - Wen-Yong Lou
- Laboratory of Applied Biocatalysis, School of Food Science and Engineering, South China University of Technology, Guangzhou 510640, Guangdong, China.
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25
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Wang C, Chen Y, Zhou H, Li X, Tan Z. Adaptation mechanisms of Rhodococcus sp. CNS16 under different temperature gradients: Physiological and transcriptome. CHEMOSPHERE 2020; 238:124571. [PMID: 31472351 DOI: 10.1016/j.chemosphere.2019.124571] [Citation(s) in RCA: 24] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/09/2019] [Revised: 08/06/2019] [Accepted: 08/09/2019] [Indexed: 06/10/2023]
Abstract
Rhodococcus exhibits strong adaptability to environmental stressors and plays a crucial role in environmental bioremediation. However, seasonal changes in ambient temperature, especially rapid temperature drops exert an adverse effect on in situ bioremediation. In this paper, we studied the cell morphology and fatty acid composition of an aniline-degrading strain Rhodococcus sp. CNS16 at temperatures of 30 °C, 20 °C, and 10 °C. At suboptimal temperatures, cell morphology of CNS16 changed from short rod-shaped to long rod or irregular shaped, and the proportion of unsaturated fatty acids was upregulated. Transcriptomic technologies were then utilized to gain detailed insights into the adaptive mechanisms of CNS16 subjected to suboptimal temperatures. The results showed that the number of gene responses was significantly higher at 10 °C than that at 20 °C. The inhibition of peptidoglycan synthase expression and up-regulation of Filamentous Temperature Sensitive as well as unsaturated fatty acid synthesis genes at suboptimal temperatures might be closely related to corresponding changes in cell morphology and fatty acids composition. Strain CNS16 showed loss of catalase and superoxide dismutase activity, and utilized thioredoxin-dependent thiol peroxidase to resist oxidative stress. The up-regulation of carotenoid and Vitamin B2 synthesis at 10 °C might also be involved in the resistance to oxidative stress. Amino acid metabolism, coenzyme and vitamin metabolism, ABC transport, and energy metabolism are essential for peptidoglycan synthesis and regulation of cellular metabolism; therefore, synergistically resisting environmental stress. This study provides a mechanistic basis for the regulation of aniline degradation in Rhodococcus sp. CNS16 at low temperatures.
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Affiliation(s)
- Chen Wang
- Key Laboratory of Environmental and Applied Microbiology, Chengdu Institute of Biology, Chinese Academy of Sciences, 610041, Chengdu, China; Environmental Microbiology Key Laboratory of Sichuan Province, Chengdu Institute of Biology, Chinese Academy of Sciences, 610041, Chengdu, China; University of Chinese Academy of Sciences, 100049, Beijing, China
| | - Yangwu Chen
- Key Laboratory of Environmental and Applied Microbiology, Chengdu Institute of Biology, Chinese Academy of Sciences, 610041, Chengdu, China; Environmental Microbiology Key Laboratory of Sichuan Province, Chengdu Institute of Biology, Chinese Academy of Sciences, 610041, Chengdu, China
| | - Houzhen Zhou
- Key Laboratory of Environmental and Applied Microbiology, Chengdu Institute of Biology, Chinese Academy of Sciences, 610041, Chengdu, China; Environmental Microbiology Key Laboratory of Sichuan Province, Chengdu Institute of Biology, Chinese Academy of Sciences, 610041, Chengdu, China
| | - Xudong Li
- Key Laboratory of Environmental and Applied Microbiology, Chengdu Institute of Biology, Chinese Academy of Sciences, 610041, Chengdu, China; Environmental Microbiology Key Laboratory of Sichuan Province, Chengdu Institute of Biology, Chinese Academy of Sciences, 610041, Chengdu, China
| | - Zhouliang Tan
- Key Laboratory of Environmental and Applied Microbiology, Chengdu Institute of Biology, Chinese Academy of Sciences, 610041, Chengdu, China; Environmental Microbiology Key Laboratory of Sichuan Province, Chengdu Institute of Biology, Chinese Academy of Sciences, 610041, Chengdu, China.
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26
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González E, Herencias C, Prieto MA. A polyhydroxyalkanoate‐based encapsulating strategy for ‘bioplasticizing’ microorganisms. Microb Biotechnol 2020; 13:185-198. [PMID: 31714682 PMCID: PMC9531750 DOI: 10.1111/1751-7915.13492] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/02/2019] [Revised: 09/16/2019] [Accepted: 09/17/2019] [Indexed: 11/29/2022] Open
Abstract
Over the past few decades, considerable interest has been shown in developing nano‐ and microcarriers with biocompatible and biodegradable materials for medical and biotechnological applications. Microencapsulation is a technology capable of enhancing the survival rate of bacteria, providing stability in harsh environments. In the present paper, we developed a technology to encapsulate microorganisms within polyhydroxyalkanoate (PHA)‐based microcapsules (MPs), employing a modified double emulsion solvent evaporation technique, with Pseudomonas putida KT2440 as a biotechnological model strain. The resulting MPs display a spherical morphology and an average particle size of 10 μm. The stability of the MPs was monitored under different conditions of storage and stress. The MPs remained stable for at least 24 days stored at 4°C in a water suspension. They exhibited greater tolerance to stress conditions; encapsulated cells remained viable for 2 h in alkaline solution and after 24 h of H2O2 exposure at 10 and 20 mM. Results suggested the potential of MPs as a microcontainer of bacterial cells, even for biotechnological applications requiring high alkaline conditions and oxidative stress. We validated the potential applicability of the PHA‐based microencapsulation method in other microorganisms by encapsulating the predatory bacterium Bdellovibrio bacteriovorus.
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Affiliation(s)
- Erika González
- Polymer Biotechnology Group Microbial and Plant Biotechnology Department Centro de Investigaciones Biológicas CIB‐CSIC Ramiro de Maeztu 9 28040 Madrid Spain
- Interdisciplinary Platform for Sustainable Plastics towards a Circular Economy‐Spanish National Research Council (SusPlast‐CSIC) Madrid Spain
| | - Cristina Herencias
- Polymer Biotechnology Group Microbial and Plant Biotechnology Department Centro de Investigaciones Biológicas CIB‐CSIC Ramiro de Maeztu 9 28040 Madrid Spain
- Interdisciplinary Platform for Sustainable Plastics towards a Circular Economy‐Spanish National Research Council (SusPlast‐CSIC) Madrid Spain
| | - M. Auxiliadora Prieto
- Polymer Biotechnology Group Microbial and Plant Biotechnology Department Centro de Investigaciones Biológicas CIB‐CSIC Ramiro de Maeztu 9 28040 Madrid Spain
- Interdisciplinary Platform for Sustainable Plastics towards a Circular Economy‐Spanish National Research Council (SusPlast‐CSIC) Madrid Spain
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27
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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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28
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Pidot SJ, Gao W, Buultjens AH, Monk IR, Guerillot R, Carter GP, Lee JYH, Lam MMC, Grayson ML, Ballard SA, Mahony AA, Grabsch EA, Kotsanas D, Korman TM, Coombs GW, Robinson JO, Gonçalves da Silva A, Seemann T, Howden BP, Johnson PDR, Stinear TP. Increasing tolerance of hospital Enterococcus faecium to handwash alcohols. Sci Transl Med 2019; 10:10/452/eaar6115. [PMID: 30068573 DOI: 10.1126/scitranslmed.aar6115] [Citation(s) in RCA: 133] [Impact Index Per Article: 26.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/10/2017] [Revised: 02/10/2018] [Accepted: 04/03/2018] [Indexed: 11/03/2022]
Abstract
Alcohol-based disinfectants and particularly hand rubs are a key way to control hospital infections worldwide. Such disinfectants restrict transmission of pathogens, such as multidrug-resistant Staphylococcus aureus and Enterococcus faecium Despite this success, health care infections caused by E. faecium are increasing. We tested alcohol tolerance of 139 hospital isolates of E. faecium obtained between 1997 and 2015 and found that E. faecium isolates after 2010 were 10-fold more tolerant to killing by alcohol than were older isolates. Using a mouse gut colonization model of E. faecium transmission, we showed that alcohol-tolerant E. faecium resisted standard 70% isopropanol surface disinfection, resulting in greater mouse gut colonization compared to alcohol-sensitive E. faecium We next looked for bacterial genomic signatures of adaptation. Alcohol-tolerant E. faecium accumulated mutations in genes involved in carbohydrate uptake and metabolism. Mutagenesis confirmed the roles of these genes in the tolerance of E. faecium to isopropanol. These findings suggest that bacterial adaptation is complicating infection control recommendations, necessitating additional procedures to prevent E. faecium from spreading in hospital settings.
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Affiliation(s)
- Sacha J Pidot
- Department of Microbiology and Immunology, The Peter Doherty Institute for Infection and Immunity, University of Melbourne, Victoria 3010, Australia
| | - Wei Gao
- Department of Microbiology and Immunology, The Peter Doherty Institute for Infection and Immunity, University of Melbourne, Victoria 3010, Australia
| | - Andrew H Buultjens
- Department of Microbiology and Immunology, The Peter Doherty Institute for Infection and Immunity, University of Melbourne, Victoria 3010, Australia
| | - Ian R Monk
- Department of Microbiology and Immunology, The Peter Doherty Institute for Infection and Immunity, University of Melbourne, Victoria 3010, Australia
| | - Romain Guerillot
- Department of Microbiology and Immunology, The Peter Doherty Institute for Infection and Immunity, University of Melbourne, Victoria 3010, Australia
| | - Glen P Carter
- Department of Microbiology and Immunology, The Peter Doherty Institute for Infection and Immunity, University of Melbourne, Victoria 3010, Australia
| | - Jean Y H Lee
- Department of Microbiology and Immunology, The Peter Doherty Institute for Infection and Immunity, University of Melbourne, Victoria 3010, Australia
| | - Margaret M C Lam
- Department of Microbiology and Immunology, The Peter Doherty Institute for Infection and Immunity, University of Melbourne, Victoria 3010, Australia
| | - M Lindsay Grayson
- Infectious Diseases Department, Austin Health, Heidelberg, Victoria 3084, Australia.,Department of Medicine, University of Melbourne, Heidelberg, Victoria 3084, Australia.,Department of Epidemiology and Preventive Medicine, Monash University, Victoria 3800, Australia
| | - Susan A Ballard
- Microbiological Diagnostic Unit Public Health Laboratory, Department of Microbiology and Immunology, The Peter Doherty Institute for Infection and Immunity, University of Melbourne, Victoria 3010, Australia
| | - Andrew A Mahony
- Infectious Diseases Department, Austin Health, Heidelberg, Victoria 3084, Australia
| | - Elizabeth A Grabsch
- Infectious Diseases Department, Austin Health, Heidelberg, Victoria 3084, Australia
| | - Despina Kotsanas
- Monash Infectious Diseases, Monash Health, Clayton, Victoria 3168, Australia
| | - Tony M Korman
- Monash Infectious Diseases, Monash Health, Clayton, Victoria 3168, Australia
| | - Geoffrey W Coombs
- Antimicrobial Resistance and Infectious Diseases Research Laboratory, School of Veterinary and Life Sciences, Murdoch University, Murdoch, Western Australia 6150, Australia.,Department of Microbiology, PathWest Laboratory Medicine WA, Fiona Stanley Hospital, Murdoch, Western Australia 6150, Australia
| | - J Owen Robinson
- Antimicrobial Resistance and Infectious Diseases Research Laboratory, School of Veterinary and Life Sciences, Murdoch University, Murdoch, Western Australia 6150, Australia.,Department of Microbiology, PathWest Laboratory Medicine WA, Fiona Stanley Hospital, Murdoch, Western Australia 6150, Australia
| | - Anders Gonçalves da Silva
- Microbiological Diagnostic Unit Public Health Laboratory, Department of Microbiology and Immunology, The Peter Doherty Institute for Infection and Immunity, University of Melbourne, Victoria 3010, Australia
| | - Torsten Seemann
- Melbourne Bioinformatics, University of Melbourne, Carlton, Victoria 3053, Australia
| | - Benjamin P Howden
- Department of Microbiology and Immunology, The Peter Doherty Institute for Infection and Immunity, University of Melbourne, Victoria 3010, Australia.,Infectious Diseases Department, Austin Health, Heidelberg, Victoria 3084, Australia.,Department of Medicine, University of Melbourne, Heidelberg, Victoria 3084, Australia.,Microbiological Diagnostic Unit Public Health Laboratory, Department of Microbiology and Immunology, The Peter Doherty Institute for Infection and Immunity, University of Melbourne, Victoria 3010, Australia
| | - Paul D R Johnson
- Department of Microbiology and Immunology, The Peter Doherty Institute for Infection and Immunity, University of Melbourne, Victoria 3010, Australia. .,Infectious Diseases Department, Austin Health, Heidelberg, Victoria 3084, Australia.,Department of Medicine, University of Melbourne, Heidelberg, Victoria 3084, Australia
| | - Timothy P Stinear
- Department of Microbiology and Immunology, The Peter Doherty Institute for Infection and Immunity, University of Melbourne, Victoria 3010, Australia.
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29
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Ozdal M. A new strategy for the efficient production of pyocyanin, a versatile pigment, in Pseudomonas aeruginosa OG1 via toluene addition. 3 Biotech 2019; 9:374. [PMID: 31588398 DOI: 10.1007/s13205-019-1907-1] [Citation(s) in RCA: 16] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/06/2019] [Accepted: 09/19/2019] [Indexed: 11/24/2022] Open
Abstract
Pseudomonas aeruginosa produce pyocyanin, which is an extracellular secondary metabolite and multifunctional pigment. In this study, the effects of several surfactants (Tween 20, Tween 80 and Triton X-100) and organic solvents (toluene and chloroform) on pyocyanin production and cell growth were investigated in submerged culture of P. aeruginosa OG1. Organic solvents were found to be more effective in the production of pyocyanin. The maximum production of pyocyanin (33 mg/L) was achieved when 0.2% toluene was added at the stationary growth phase (30 h), corresponding to significant increase of 312% compared with the control (8 mg/L). With the addition of toluene, pyocyanin production was significantly increased, but bacterial biomass reduced. Production of alkaline protease was also affected by toluene addition. It was found that the ratio of saturated/unsaturated fatty acids in the bacterial biomass significantly increased when toluene addition to the medium. This study revealed that with a novel strategy, the addition of toluene to the fermentation medium significantly increased pyocyanin production. These findings suggest that solvent-assisted fermentation strategy can be used in microbial fermentations to increase the production of biotechnological products such as industrially important pigment and enzyme. This study is a first investigation on the stimulation of pyocyanin release in the medium of P. aeruginosa cultures by the addition of toluene.
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Affiliation(s)
- Murat Ozdal
- Department of Biology, Science Faculty, Ataturk University, Erzurum, 25240 Turkey
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30
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Kondakova T, Kumar S, Cronan JE. A novel synthesis of trans-unsaturated fatty acids by the Gram-positive commensal bacterium Enterococcus faecalis FA2-2. Chem Phys Lipids 2019; 222:23-35. [PMID: 31054954 PMCID: PMC7392533 DOI: 10.1016/j.chemphyslip.2019.04.010] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/12/2019] [Revised: 04/15/2019] [Accepted: 04/29/2019] [Indexed: 11/30/2022]
Abstract
A key mechanism of Pseudomonas spp. adaptation to environmental stressors is their ability to convert the cis-unsaturated fatty acids of the membrane lipids to their trans-isomers to rigidify the membrane and thereby resist stresses. Although this Cti-catalyzed enzymatic isomerization has been well investigated in the P. putida paradigm, several bacterial species have been found to produce trans-unsaturated fatty acids. Although cti orthologs have only been reported in Gram-negative bacteria, we report that E. faecalis FA2-2 cultures synthesize trans-unsaturated fatty acids during growth by a mechanism similar of P. putida. Although the role of trans-unsaturated fatty acids (trans-UFAs) in E. faecalis remains obscure, our results indicate that organic solvents, as well as the membrane altering antibiotic, daptomycin, had no effect on trans-UFA formation in E. faecalis FA2-2. Moreover trans-UFA production in E. faecalis FA2-2 membranes was constant in oxidative stress conditions or when metal chelator EDTA was added, raising the question about the role of heme domain in cis-trans isomerization in E. faecalis FA2-2. Although growth temperature and growth phase had significant effects on cis-trans isomerization, the bulk physical properties of the membranes seems unlikely to be altered by the low levels of trans-UFA. Hence, any effects seems likely to be on membrane proteins and membrane enzyme activities. We also report investigations of cti gene distribution in bacteria was and suggest the distribution to be triggered by habitat population associations. Three major Cti clusters were defined, corresponding to Pseudomonas, Pseudoalteromonas and Vibrio Cti proteins.
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Affiliation(s)
- Tatiana Kondakova
- Department of Microbiology, University of Illinois, Urbana, IL, 61801, USA
| | - Sneha Kumar
- 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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31
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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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32
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Santos IC, Chaumette A, Smuts J, Hildenbrand ZL, Schug KA. Analysis of bacteria stress responses to contaminants derived from shale energy extraction. ENVIRONMENTAL SCIENCE. PROCESSES & IMPACTS 2019; 21:269-278. [PMID: 30444232 DOI: 10.1039/c8em00338f] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/09/2023]
Abstract
In order to survive environmental changes, bacteria have stress responses, which protect them from adverse and variable conditions. Contamination can be a source of stress and bacterial responses can serve as an indicator of environmental abnormality. In this work, the biochemical effects of toxic compounds that stem from hydraulic fracturing were measured on the whole cell-derived fatty acid and protein compositions of Escherichia coli, Klebsiella oxytoca, Pseudomonas aeruginosa, Pseudomonas putida, Pseudomonas stutzeri, Aeromonas hydrophila, Bacillus cereus, and Bacillus subtilis. These microorganisms were exposed to elevated levels of benzene, ethanol, propanol, toluene, and salt. These were chosen to represent significant subsurface contamination or a surface spill. The fatty acid and protein profiles for the bacteria were analyzed using gas chromatography - vacuum ultraviolet spectroscopy and matrix-assisted laser desorption ionization time-of-flight mass spectrometry, respectively. Overall, different fatty acid and protein profiles were observed when the microorganisms were grown in the presence of the toxic compounds. The cells exhibited an increase in the saturated/unsaturated ratio and displayed the presence of branched and cyclopropane fatty acids when in the presence of common fracture fluid constituents to decrease membrane permeability which was confirmed by the analysis of produced water. This approach provides a potentially useful tool for environmental diagnosis, since proteins and fatty acids can act as a harbinger of ecological health.
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Affiliation(s)
- Inês C Santos
- Department of Chemistry and Biochemistry, The University of Texas at Arlington, 700 Planetarium Pl.; Box 19065, Arlington, TX 76019-0065, USA.
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34
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Xu X, Liu W, Tian S, Wang W, Qi Q, Jiang P, Gao X, Li F, Li H, Yu H. Petroleum Hydrocarbon-Degrading Bacteria for the Remediation of Oil Pollution Under Aerobic Conditions: A Perspective Analysis. Front Microbiol 2018; 9:2885. [PMID: 30559725 PMCID: PMC6287552 DOI: 10.3389/fmicb.2018.02885] [Citation(s) in RCA: 222] [Impact Index Per Article: 37.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/15/2018] [Accepted: 11/12/2018] [Indexed: 11/13/2022] Open
Abstract
With the sharp increase in population and modernization of society, environmental pollution resulting from petroleum hydrocarbons has increased, resulting in an urgent need for remediation. Petroleum hydrocarbon-degrading bacteria are ubiquitous in nature and can utilize these compounds as sources of carbon and energy. Bacteria displaying such capabilities are often exploited for the bioremediation of petroleum oil-contaminated environments. Recently, microbial remediation technology has developed rapidly and achieved major gains. However, this technology is not omnipotent. It is affected by many environmental factors that hinder its practical application, limiting the large-scale application of the technology. This paper provides an overview of the recent literature referring to the usage of bacteria as biodegraders, discusses barriers regarding the implementation of this microbial technology, and provides suggestions for further developments.
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Affiliation(s)
- Xingjian Xu
- Northeast Institute of Geography and Agroecology, Chinese Academy of Sciences, Changchun, China.,Hinggan League Academy of Agriculture and Animal Husbandry, Ulanhot, China
| | - Wenming Liu
- Hinggan League Academy of Agriculture and Animal Husbandry, Ulanhot, China
| | - Shuhua Tian
- Hinggan League Academy of Agriculture and Animal Husbandry, Ulanhot, China
| | - Wei Wang
- Hinggan League Academy of Agriculture and Animal Husbandry, Ulanhot, China
| | - Qige Qi
- Hinggan League Academy of Agriculture and Animal Husbandry, Ulanhot, China
| | - Pan Jiang
- Hinggan League Academy of Agriculture and Animal Husbandry, Ulanhot, China
| | - Xinmei Gao
- Hinggan League Academy of Agriculture and Animal Husbandry, Ulanhot, China
| | - Fengjiao Li
- Hinggan League Academy of Agriculture and Animal Husbandry, Ulanhot, China
| | - Haiyan Li
- Northeast Institute of Geography and Agroecology, Chinese Academy of Sciences, Changchun, China.,School of Life Science and Technology, Changchun University of Science and Technology, Changchun, China
| | - Hongwen Yu
- Northeast Institute of Geography and Agroecology, Chinese Academy of Sciences, Changchun, China.,School of Life Science and Technology, Changchun University of Science and Technology, Changchun, China
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35
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Zhao L, Lu X, Polasko A, Johnson NW, Miao Y, Yang Z, Mahendra S, Gu B. Co-contaminant effects on 1,4-dioxane biodegradation in packed soil column flow-through systems. ENVIRONMENTAL POLLUTION (BARKING, ESSEX : 1987) 2018; 243:573-581. [PMID: 30216889 DOI: 10.1016/j.envpol.2018.09.018] [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: 05/31/2018] [Revised: 08/10/2018] [Accepted: 09/03/2018] [Indexed: 06/08/2023]
Abstract
Biodegradation of 1,4-dioxane was examined in packed quartz and soil column flow-through systems. The inhibitory effects of co-contaminants, specifically trichloroethene (TCE), 1,1-dichloroethene (1,1-DCE), and copper (Cu2+) ions, were investigated in the columns either with or without bioaugmentation with a 1,4-dioxane degrading bacterium Pseudonocardia dioxanivorans CB1190. Results indicate that CB1190 cells readily grew and colonized in the columns, leading to significant degradation of 1,4-dioxane under oxic conditions. Degradation of 1,4-dioxane was also observed in the native soil (without bioaugmentation), which had been previously subjected to enhanced reductive dechlorination treatment for co-contaminants TCE and 1,1-DCE. Bioaugmentation of the soil with CB1190 resulted in nearly complete degradation at influent concentrations of 3-10 mg L-1 1,4-dioxane and a residence reaction time of 40-80 h, but the presence of co-contaminants, 1,1-DCE and Cu2+ ions (up to 10 mg L-1), partially inhibited 1,4-dioxane degradation in the untreated and bioaugmented soil columns. However, the inhibitory effects were much less severe in the column flow-through systems than those previously observed in planktonic cultures, which showed near complete inhibition at the same co-contaminant concentrations. These observations demonstrate a low susceptibility of soil microbes to the toxicity of 1,1-DCE and Cu2+ in packed soil flow-through systems, and thus have important implications for predicting biodegradation potential and developing sustainable, cost-effective technologies for in situ remediation of 1,4-dioxane contaminated soils and groundwater.
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Affiliation(s)
- Linduo Zhao
- Environmental Science Division, Oak Ridge National Laboratory, Oak Ridge, TN, 37831, United States
| | - Xia Lu
- Environmental Science Division, Oak Ridge National Laboratory, Oak Ridge, TN, 37831, United States
| | - Alexandra Polasko
- Department of Civil and Environmental Engineering, University of California, Los Angeles, CA, 90095, United States
| | - Nicholas W Johnson
- Department of Civil and Environmental Engineering, University of California, Los Angeles, CA, 90095, United States
| | - Yu Miao
- Department of Civil and Environmental Engineering, University of California, Los Angeles, CA, 90095, United States
| | - Ziming Yang
- Department of Chemistry, Oakland University, Rochester, MI 48309, United States
| | - Shaily Mahendra
- Department of Civil and Environmental Engineering, University of California, Los Angeles, CA, 90095, United States
| | - Baohua Gu
- Environmental Science Division, Oak Ridge National Laboratory, Oak Ridge, TN, 37831, United States; Department of Biosystems Engineering and Soil Science, University of Tennessee, Knoxville, TN, 37996, United States.
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36
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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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Petrova P, Tsvetanova F, Petrov K. Low cell surface hydrophobicity is one of the key factors for high butanol tolerance of Lactic acid bacteria. Eng Life Sci 2018; 19:133-142. [PMID: 32624995 DOI: 10.1002/elsc.201800141] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/31/2018] [Revised: 11/05/2018] [Accepted: 11/21/2018] [Indexed: 12/14/2022] Open
Abstract
Highly butanol-tolerant strains have always been attractive because of their potential as microbial hosts for butanol production. However, due to the amphiphilic nature of 1-butanol as a solvent, the relationship between the cell surface hydrophobicity and butanol resistance remained ambiguous to date. In this work, the quantitatively estimated cell surface hydrophobicity of 74 Lactic acid bacteria strains were juxtaposed to their tolerance to various butanol concentrations. The obtained results revealed that the strains' hydrophobicity was inversely proportional to their butanol tolerance. All highly butanol-resistant strains were hydrophilic (cell surface hydrophobicity<1%), whereas the more hydrophobic the strains were, the more sensitive to butanol they were. Furthermore, cultivation at increasing butanol concentrations showed a clear tendency to decrease the level of hydrophobicity in all tested organisms, thus suggesting possible adaptation mechanisms. Purposeful reduction of cell surface hydrophobicity (by removal of S-layer proteins from the cell envelope) also led to an increase of butanol resistance. Since the results covered 23 different Lactic acid bacteria species of seven genera, it could be concluded that regardless of the species, the lower degree of cells' hydrophobicity clearly correlates with the higher level of butanol tolerance.
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Affiliation(s)
- Penka Petrova
- Institute of Microbiology Bulgarian Academy of Sciences Sofia Bulgaria
| | - Flora Tsvetanova
- Institute of Chemical Engineering Bulgarian Academy of Sciences Sofia Bulgaria
| | - Kaloyan Petrov
- Institute of Chemical Engineering Bulgarian Academy of Sciences Sofia Bulgaria
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38
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Solvent Tolerance in Bacteria: Fulfilling the Promise of the Biotech Era? Trends Biotechnol 2018; 36:1025-1039. [DOI: 10.1016/j.tibtech.2018.04.007] [Citation(s) in RCA: 35] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/26/2018] [Revised: 04/17/2018] [Accepted: 04/19/2018] [Indexed: 01/01/2023]
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39
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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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40
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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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41
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Song B, Zhou Q, Xue HJ, Liu JJ, Zheng YY, Shen YB, Wang M, Luo JM. IrrE Improves Organic Solvent Tolerance and Δ 1-Dehydrogenation Productivity of Arthrobacter simplex. JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY 2018; 66:5210-5220. [PMID: 29746123 DOI: 10.1021/acs.jafc.8b01311] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/08/2023]
Abstract
During steroid bioconversion, organic solvents are widely used for facilitating hydrophobic substrate dissolution in industry. Thus, strains that tolerate organic solvents are highly desirable. IrrE, a global transcriptional factor, was introduced into Arthrobacter simplex with Δ1-dehydrogenation ability. The results evidenced that IrrE did not affect cell biological traits and biotransformation performance under non-stress conditions. However, the recombinant strain achieved a productivity higher than that of the control strain in systems containing more ethanol and substrate, which coincided with cell viability under ethanol stress, the major stress factor during biotransformation. It also demonstrated that IrrE caused genome-wide transcriptional perturbation, and several defense proteins or systems were linked with higher organic solvent tolerance. IrrE simultaneously enhanced cell resistance to various stresses, and its horizontal impacts showed strain and stress dependence. In conclusion, the introduction of exogenous global regulators is an efficient approach to enhance organic solvent tolerance in steroid-transforming strains, resulting in higher productivity.
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Affiliation(s)
- Bo Song
- Key Laboratory of Industrial Fermentation Microbiology, Ministry of Education, Tianjin Key Lab of Industrial Microbiology, College of Biotechnology , Tianjin University of Science and Technology , Tianjin 300457 , People's Republic of China
| | - Qin Zhou
- Key Laboratory of Industrial Fermentation Microbiology, Ministry of Education, Tianjin Key Lab of Industrial Microbiology, College of Biotechnology , Tianjin University of Science and Technology , Tianjin 300457 , People's Republic of China
| | - Hai-Jie Xue
- Key Laboratory of Industrial Fermentation Microbiology, Ministry of Education, Tianjin Key Lab of Industrial Microbiology, College of Biotechnology , Tianjin University of Science and Technology , Tianjin 300457 , People's Republic of China
| | - Jia-Jia Liu
- Key Laboratory of Industrial Fermentation Microbiology, Ministry of Education, Tianjin Key Lab of Industrial Microbiology, College of Biotechnology , Tianjin University of Science and Technology , Tianjin 300457 , People's Republic of China
| | - Yuan-Yuan Zheng
- Key Laboratory of Industrial Fermentation Microbiology, Ministry of Education, Tianjin Key Lab of Industrial Microbiology, College of Biotechnology , Tianjin University of Science and Technology , Tianjin 300457 , People's Republic of China
| | - Yan-Bing Shen
- Key Laboratory of Industrial Fermentation Microbiology, Ministry of Education, Tianjin Key Lab of Industrial Microbiology, College of Biotechnology , Tianjin University of Science and Technology , Tianjin 300457 , People's Republic of China
| | - Min Wang
- Key Laboratory of Industrial Fermentation Microbiology, Ministry of Education, Tianjin Key Lab of Industrial Microbiology, College of Biotechnology , Tianjin University of Science and Technology , Tianjin 300457 , People's Republic of China
| | - Jian-Mei Luo
- Key Laboratory of Industrial Fermentation Microbiology, Ministry of Education, Tianjin Key Lab of Industrial Microbiology, College of Biotechnology , Tianjin University of Science and Technology , Tianjin 300457 , People's Republic of China
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42
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Kanauchi M, Nagata A, Kondo A. Accumulation of Hydroxyl Fatty Acid inLactobacillus sakeiY-20 Cells Cultivated under Stress Conditions and Expression of Fatty Acid Hydroxylase. JOURNAL OF THE AMERICAN SOCIETY OF BREWING CHEMISTS 2018. [DOI: 10.1080/03610470.2017.1402580] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
Affiliation(s)
- Makoto Kanauchi
- Department of Food Management, Miyagi University, 2-2-1 Hatatate, Taihaku-ku, Sendai, Miyagi, Japan
| | - Ayaka Nagata
- Department of Food Management, Miyagi University, 2-2-1 Hatatate, Taihaku-ku, Sendai, Miyagi, Japan
| | - Ayaka Kondo
- Department of Food Management, Miyagi University, 2-2-1 Hatatate, Taihaku-ku, Sendai, Miyagi, Japan
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43
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Role and mechanism of cell-surface hydrophobicity in the adaptation of Sphingobium hydrophobicum to electronic-waste contaminated sediment. Appl Microbiol Biotechnol 2018; 102:2803-2815. [DOI: 10.1007/s00253-017-8734-2] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/01/2017] [Revised: 11/29/2017] [Accepted: 12/12/2017] [Indexed: 01/16/2023]
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44
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Kalita D, Joshi S. Study on bioremediation of Lead by exopolysaccharide producing metallophilic bacterium isolated from extreme habitat. BIOTECHNOLOGY REPORTS (AMSTERDAM, NETHERLANDS) 2017; 16:48-57. [PMID: 29167759 PMCID: PMC5686426 DOI: 10.1016/j.btre.2017.11.003] [Citation(s) in RCA: 36] [Impact Index Per Article: 5.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 09/23/2017] [Revised: 11/04/2017] [Accepted: 11/04/2017] [Indexed: 11/21/2022]
Abstract
Lead released from manufacturing factories, recycling plants, automobile company and landfill leachate is abundantly found in wastewater. An efficient bioremediating agent for lead removal from wastewater is expected to ease the ever increasing problem. The present study reports Pseudomonas sp. W6 isolated from extreme habitat of hot water spring of North-East India evaluated for its Lead biosorption property. The bacterium showed capacity to resist 1.0 mM lead in both solid and liquid minimal media. Epifluorescence microscopy reveal the viability of bacterial cells under metal stress condition. ICP-MS analysis revealed 65% and 61.2% removal of lead from the Synthetic Bangladesh Ground Water medium in batch culture and column study respectively which was higher when compared to biosorption capacity of P. aeruginosa MTCC2474, P. alcaligenes MJ7 from forest soil and P. ficuserectae PKRS11 from uranium rich soil. Exopolysaccharide released by the isolate which influenced biosorption revealed the presence of ligands assayed using microbial hydrophobicity and FTIR. The extremophilic isolate is proposed as a choice for efficient bioremediation of lead contaminated wastewater.
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Affiliation(s)
- Debajit Kalita
- Microbiology Laboratory, Department of Biotechnology and Bioinformatics, North-Eastern Hill University, Shillong 793022, Meghalaya, India
| | - S.R. Joshi
- Microbiology Laboratory, Department of Biotechnology and Bioinformatics, North-Eastern Hill University, Shillong 793022, Meghalaya, India
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45
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Choi H, Lim B, Park Y, Joo W. Improvement in solvent tolerance by exogenous glycerol inPseudomonassp. BCNU 106. Lett Appl Microbiol 2017; 65:147-152. [DOI: 10.1111/lam.12754] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/21/2017] [Revised: 04/25/2017] [Accepted: 05/02/2017] [Indexed: 11/30/2022]
Affiliation(s)
- H.J. Choi
- Department of Biology and Chemistry; Changwon National University; Changwon Korea
| | - B.R. Lim
- Department of Biology and Chemistry; Changwon National University; Changwon Korea
| | - Y.J. Park
- Department of Biology and Chemistry; Changwon National University; Changwon Korea
| | - W.H. Joo
- Department of Biology and Chemistry; Changwon National University; Changwon Korea
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46
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Mahipant G, Paemanee A, Roytrakul S, Kato J, Vangnai AS. The significance of proline and glutamate on butanol chaotropic stress in Bacillus subtilis 168. BIOTECHNOLOGY FOR BIOFUELS 2017; 10:122. [PMID: 28503197 PMCID: PMC5425972 DOI: 10.1186/s13068-017-0811-3] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 07/10/2016] [Accepted: 05/04/2017] [Indexed: 06/07/2023]
Abstract
BACKGROUND Butanol is an intensively used industrial solvent and an attractive alternative biofuel, but the bioproduction suffers from its high toxicity. Among the native butanol producers and heterologous butanol-producing hosts, Bacillus subtilis 168 exhibited relatively higher butanol tolerance. Nevertheless, organic solvent tolerance mechanisms in Bacilli and Gram-positive bacteria have relatively less information. Thus, this study aimed to elucidate butanol stress responses that may involve in unique tolerance of B. subtilis 168 to butanol and other alcohol biocommodities. RESULTS Using comparative proteomics approach and molecular analysis of butanol-challenged B. subtilis 168, 108 butanol-responsive proteins were revealed, and classified into seven groups according to their biological functions. While parts of them may be similar to the proteins reportedly involved in solvent stress response in other Gram-positive bacteria, significant role of proline in the proline-glutamate-arginine metabolism was substantiated. Detection of intracellular proline and glutamate accumulation, as well as glutamate transient conversion during butanol exposure confirmed their necessity, especially proline, for cellular butanol tolerance. Disruption of the particular genes in proline biosynthesis pathways clarified the essential role of the anabolic ProB-ProA-ProI system over the osmoadaptive ProH-ProA-ProJ system for cellular protection in response to butanol exposure. Molecular modifications to increase gene dosage for proline biosynthesis as well as for glutamate acquisition enhanced butanol tolerance of B. subtilis 168 up to 1.8% (vol/vol) under the conditions tested. CONCLUSION This work revealed the important role of proline as an effective compatible solute that is required to protect cells against butanol chaotropic effect and to maintain cellular functions in B. subtilis 168 during butanol exposure. Nevertheless, the accumulation of intracellular proline against butanol stress required a metabolic conversion of glutamate through the specific biosynthetic ProB-ProA-ProI route. Thus, exogenous addition of glutamate, but not proline, enhanced butanol tolerance. These findings serve as a practical knowledge to enhance B. subtilis 168 butanol tolerance, and demonstrate means to engineer the bacterial host to promote higher butanol/alcohol tolerance of B. subtilis 168 for the production of butanol and other alcohol biocommodities.
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Affiliation(s)
- Gumpanat Mahipant
- Biological Sciences Program, Faculty of Science, Chulalongkorn University, Bangkok, 10330 Thailand
- Department of Biochemistry, Faculty of Science, Chulalongkorn University, Bangkok, 10330 Thailand
| | - Atchara Paemanee
- Proteomics Research Laboratory, Genome Institute Biotechnology, National Center for Genetic Engineering and Biotechnology (BIOTEC), Pathum Thani, 12120 Thailand
| | - Sittiruk Roytrakul
- Proteomics Research Laboratory, Genome Institute Biotechnology, National Center for Genetic Engineering and Biotechnology (BIOTEC), Pathum Thani, 12120 Thailand
| | - Junichi Kato
- Department of Molecular Biotechnology, Graduate School of Advanced Sciences of Matter, Hiroshima University, Hiroshima, 739-8530 Japan
| | - Alisa S. Vangnai
- Department of Biochemistry, Faculty of Science, Chulalongkorn University, Bangkok, 10330 Thailand
- Center of Excellence on Hazardous Substance Management (HSM), Chulalongkorn University, Bangkok, 10330 Thailand
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47
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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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48
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de Carvalho CCCR. Whole cell biocatalysts: essential workers from Nature to the industry. Microb Biotechnol 2017; 10:250-263. [PMID: 27145540 PMCID: PMC5328830 DOI: 10.1111/1751-7915.12363] [Citation(s) in RCA: 140] [Impact Index Per Article: 20.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/27/2016] [Revised: 03/28/2016] [Accepted: 03/31/2016] [Indexed: 11/30/2022] Open
Abstract
Microorganisms have been exposed to a myriad of substrates and environmental conditions throughout evolution resulting in countless metabolites and enzymatic activities. Although mankind have been using these properties for centuries, we have only recently learned to control their production, to develop new biocatalysts with high stability and productivity and to improve their yields under new operational conditions. However, microbial cells still provide the best known environment for enzymes, preventing conformational changes in the protein structure in non-conventional medium and under harsh reaction conditions, while being able to efficiently regenerate necessary cofactors and to carry out cascades of reactions. Besides, a still unknown microbe is probably already producing a compound that will cure cancer, Alzeihmer's disease or kill the most resistant pathogen. In this review, the latest developments in screening desirable activities and improving production yields are discussed.
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Affiliation(s)
- Carla C. C. R. de Carvalho
- iBB‐Institute for Bioengineering and BiosciencesDepartment of BioengineeringInstituto Superior TécnicoUniversidade de LisboaAv. Rovisco PaisLisbon1049‐001Portugal
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49
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Thurotte A, Brüser T, Mascher T, Schneider D. Membrane chaperoning by members of the PspA/IM30 protein family. Commun Integr Biol 2017. [PMCID: PMC5333519 DOI: 10.1080/19420889.2016.1264546] [Citation(s) in RCA: 22] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/05/2023] Open
Abstract
PspA, IM30 (Vipp1) and LiaH, which all belong to the PspA/IM30 protein family, form high molecular weight oligomeric structures. For all proteins membrane binding and protection of the membrane structure and integrity has been shown or postulated. Here we discuss the possible membrane chaperoning activity of PspA, IM30 and LiaH and propose that larger oligomeric structures bind to stressed membrane regions, followed by oligomer disassembly and membrane stabilization by protein monomers or smaller/different oligomeric scaffolds.
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Affiliation(s)
- Adrien Thurotte
- Institut für Pharmazie und Biochemie, Johannes Gutenberg-Universität Mainz, Mainz, Germany
| | - Thomas Brüser
- Institut für Mikrobiologie, Leibniz Universität Hannover, Hannover, Germany
| | - Thorsten Mascher
- Institut für Mikrobiologie, Technische Universität Dresden, Dresden, Germany
| | - Dirk Schneider
- Institut für Pharmazie und Biochemie, Johannes Gutenberg-Universität Mainz, Mainz, Germany
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50
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Genome and Proteome Analysis of Rhodococcus erythropolis MI2: Elucidation of the 4,4´-Dithiodibutyric Acid Catabolism. PLoS One 2016; 11:e0167539. [PMID: 27977722 PMCID: PMC5157978 DOI: 10.1371/journal.pone.0167539] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/29/2016] [Accepted: 11/15/2016] [Indexed: 01/02/2023] Open
Abstract
Rhodococcus erythropolis MI2 has the extraordinary ability to utilize the xenobiotic 4,4´-dithiodibutyric acid (DTDB). Cleavage of DTDB by the disulfide-reductase Nox, which is the only verified enzyme involved in DTDB-degradation, raised 4-mercaptobutyric acid (4MB). 4MB could act as building block of a novel polythioester with unknown properties. To completely unravel the catabolism of DTDB, the genome of R. erythropolis MI2 was sequenced, and subsequently the proteome was analyzed. The draft genome sequence consists of approximately 7.2 Mbp with an overall G+C content of 62.25% and 6,859 predicted protein-encoding genes. The genome of strain MI2 is composed of three replicons: one chromosome and two megaplasmids with sizes of 6.45, 0.4 and 0.35 Mbp, respectively. When cells of strain MI2 were cultivated with DTDB as sole carbon source and compared to cells grown with succinate, several interesting proteins with significantly higher expression levels were identified using 2D-PAGE and MALDI-TOF mass spectrometry. A putative luciferase-like monooxygenase-class F420-dependent oxidoreductase (RERY_05640), which is encoded by one of the 126 monooxygenase-encoding genes of the MI2-genome, showed a 3-fold increased expression level. This monooxygenase could oxidize the intermediate 4MB into 4-oxo-4-sulfanylbutyric acid. Next, a desulfurization step, which forms succinic acid and volatile hydrogen sulfide, is proposed. One gene coding for a putative desulfhydrase (RERY_06500) was identified in the genome of strain MI2. However, the gene product was not recognized in the proteome analyses. But, a significant expression level with a ratio of up to 7.3 was determined for a putative sulfide:quinone oxidoreductase (RERY_02710), which could also be involved in the abstraction of the sulfur group. As response to the toxicity of the intermediates, several stress response proteins were strongly expressed, including a superoxide dismutase (RERY_05600) and an osmotically induced protein (RERY_02670). Accordingly, novel insights in the catabolic pathway of DTDB were gained.
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