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Mika T, Kalnins M, Spalvins K. The use of droplet-based microfluidic technologies for accelerated selection of Yarrowia lipolytica and Phaffia rhodozyma yeast mutants. Biol Methods Protoc 2024; 9:bpae049. [PMID: 39114747 PMCID: PMC11303513 DOI: 10.1093/biomethods/bpae049] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/11/2024] [Revised: 06/24/2024] [Accepted: 07/09/2024] [Indexed: 08/10/2024] Open
Abstract
Microorganisms are widely used for the industrial production of various valuable products, such as pharmaceuticals, food and beverages, biofuels, enzymes, amino acids, vaccines, etc. Research is constantly carried out to improve their properties, mainly to increase their productivity and efficiency and reduce the cost of the processes. The selection of microorganisms with improved qualities takes a lot of time and resources (both human and material); therefore, this process itself needs optimization. In the last two decades, microfluidics technology appeared in bioengineering, which allows for manipulating small particles (from tens of microns to nanometre scale) in the flow of liquid in microchannels. The technology is based on small-volume objects (microdroplets from nano to femtolitres), which are manipulated using a microchip. The chip is made of an optically transparent inert to liquid medium material and contains a series of channels of small size (<1 mm) of certain geometry. Based on the physical and chemical properties of microparticles (like size, weight, optical density, dielectric constant, etc.), they are separated using microsensors. The idea of accelerated selection of microorganisms is the application of microfluidic technologies to separate mutants with improved qualities after mutagenesis. This article discusses the possible application and practical implementation of microfluidic separation of mutants, including yeasts like Yarrowia lipolytica and Phaffia rhodozyma after chemical mutagenesis will be discussed.
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Affiliation(s)
- Taras Mika
- Institute of Energy Systems and Environment, Riga Technical University, 12 – K1 Āzene street, Riga, LV-1048, Latvia
| | - Martins Kalnins
- Institute of Energy Systems and Environment, Riga Technical University, 12 – K1 Āzene street, Riga, LV-1048, Latvia
| | - Kriss Spalvins
- Institute of Energy Systems and Environment, Riga Technical University, 12 – K1 Āzene street, Riga, LV-1048, Latvia
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2
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Georgescu AM, Corbu VM, Csutak O. Molecular Basis of Yeasts Antimicrobial Activity-Developing Innovative Strategies for Biomedicine and Biocontrol. Curr Issues Mol Biol 2024; 46:4721-4750. [PMID: 38785553 PMCID: PMC11119588 DOI: 10.3390/cimb46050285] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/31/2024] [Revised: 04/28/2024] [Accepted: 05/11/2024] [Indexed: 05/25/2024] Open
Abstract
In the context of the growing concern regarding the appearance and spread of emerging pathogens with high resistance to chemically synthetized biocides, the development of new agents for crops and human protection has become an emergency. In this context, the yeasts present a huge potential as eco-friendly agents due to their widespread nature in various habitats and to their wide range of antagonistic mechanisms. The present review focuses on some of the major yeast antimicrobial mechanisms, their molecular basis and practical applications in biocontrol and biomedicine. The synthesis of killer toxins, encoded by dsRNA virus-like particles, dsDNA plasmids or chromosomal genes, is encountered in a wide range of yeast species from nature and industry and can affect the development of phytopathogenic fungi and other yeast strains, as well as human pathogenic bacteria. The group of the "red yeasts" is gaining more interest over the last years, not only as natural producers of carotenoids and rhodotorulic acid with active role in cell protection against the oxidative stress, but also due to their ability to inhibit the growth of pathogenic yeasts, fungi and bacteria using these compounds and the mechanism of competition for nutritive substrate. Finally, the biosurfactants produced by yeasts characterized by high stability, specificity and biodegrability have proven abilities to inhibit phytopathogenic fungi growth and mycelia formation and to act as efficient antibacterial and antibiofilm formation agents for biomedicine. In conclusion, the antimicrobial activity of yeasts represents a direction of research with numerous possibilities of bioeconomic valorization as innovative strategies to combat pathogenic microorganisms.
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Affiliation(s)
- Ana-Maria Georgescu
- Department of Genetics, Faculty of Biology, University of Bucharest, Aleea Portocalelor 1-3, 060101 Bucharest, Romania; (A.-M.G.); (V.M.C.)
| | - Viorica Maria Corbu
- Department of Genetics, Faculty of Biology, University of Bucharest, Aleea Portocalelor 1-3, 060101 Bucharest, Romania; (A.-M.G.); (V.M.C.)
- Research Institute of University of Bucharest (ICUB), University of Bucharest, B.P. Hasdeu Street 7, 050568 Bucharest, Romania
| | - Ortansa Csutak
- Department of Genetics, Faculty of Biology, University of Bucharest, Aleea Portocalelor 1-3, 060101 Bucharest, Romania; (A.-M.G.); (V.M.C.)
- Research Institute of University of Bucharest (ICUB), University of Bucharest, B.P. Hasdeu Street 7, 050568 Bucharest, Romania
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3
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Basiony M, Ouyang L, Wang D, Yu J, Zhou L, Zhu M, Wang X, Feng J, Dai J, Shen Y, Zhang C, Hua Q, Yang X, Zhang L. Optimization of microbial cell factories for astaxanthin production: Biosynthesis and regulations, engineering strategies and fermentation optimization strategies. Synth Syst Biotechnol 2022; 7:689-704. [PMID: 35261927 PMCID: PMC8866108 DOI: 10.1016/j.synbio.2022.01.002] [Citation(s) in RCA: 21] [Impact Index Per Article: 10.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/29/2021] [Revised: 12/08/2021] [Accepted: 01/03/2022] [Indexed: 12/29/2022] Open
Abstract
The global market demand for natural astaxanthin is rapidly increasing owing to its safety, the potential health benefits, and the diverse applications in food and pharmaceutical industries. The major native producers of natural astaxanthin on industrial scale are the alga Haematococcus pluvialis and the yeast Xanthopyllomyces dendrorhous. However, the natural production via these native producers is facing challenges of limited yield and high cost of cultivation and extraction. Alternatively, astaxanthin production via metabolically engineered non-native microbial cell factories such as Escherichia coli, Saccharomyces cerevisiae and Yarrowia lipolytica is another promising strategy to overcome these limitations. In this review we summarize the recent scientific and biotechnological progresses on astaxanthin biosynthetic pathways, transcriptional regulations, the interrelation with lipid metabolism, engineering strategies as well as fermentation process control in major native and non-native astaxanthin producers. These progresses illuminate the prospects of producing astaxanthin by microbial cell factories on industrial scale.
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Affiliation(s)
- Mostafa Basiony
- State Key Laboratory of Bioreactor Engineering, East China University of Science and Technology, Shanghai, 200237, China
| | - Liming Ouyang
- State Key Laboratory of Bioreactor Engineering, East China University of Science and Technology, Shanghai, 200237, China
| | - Danni Wang
- State Key Laboratory of Bioreactor Engineering, East China University of Science and Technology, Shanghai, 200237, China
| | - Jiaming Yu
- State Key Laboratory of Bioreactor Engineering, East China University of Science and Technology, Shanghai, 200237, China
| | - Liming Zhou
- State Key Laboratory of Bioreactor Engineering, East China University of Science and Technology, Shanghai, 200237, China
| | - Mohan Zhu
- State Key Laboratory of Bioreactor Engineering, East China University of Science and Technology, Shanghai, 200237, China
| | - Xuyuan Wang
- State Key Laboratory of Bioreactor Engineering, East China University of Science and Technology, Shanghai, 200237, China
| | - Jie Feng
- State Key Laboratory of Bioreactor Engineering, East China University of Science and Technology, Shanghai, 200237, China
| | - Jing Dai
- State Key Laboratory of Bioreactor Engineering, East China University of Science and Technology, Shanghai, 200237, China
| | - Yijie Shen
- State Key Laboratory of Bioreactor Engineering, East China University of Science and Technology, Shanghai, 200237, China
| | - Chengguo Zhang
- Shandong Jincheng Bio-Pharmaceutical Co., Ltd., No. 117 Qixing River Road, Zibo, 255130, Shandong, China
| | - Qiang Hua
- State Key Laboratory of Bioreactor Engineering, East China University of Science and Technology, Shanghai, 200237, China
| | - Xiuliang Yang
- Shandong Jincheng Bio-Pharmaceutical Co., Ltd., No. 117 Qixing River Road, Zibo, 255130, Shandong, China
| | - Lixin Zhang
- State Key Laboratory of Bioreactor Engineering, East China University of Science and Technology, Shanghai, 200237, China
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Enhancing astaxanthin yield in Phaffia rhodozyma: current trends and potential of phytohormones. Appl Microbiol Biotechnol 2022; 106:3531-3538. [PMID: 35579685 DOI: 10.1007/s00253-022-11972-5] [Citation(s) in RCA: 8] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/31/2022] [Revised: 04/30/2022] [Accepted: 05/07/2022] [Indexed: 11/27/2022]
Abstract
Astaxanthin is an important ketocarotenoid with remarkable biological activities and high economic value. In recent times, natural astaxanthin production by microorganisms has attracted much attention particularly in pharmaceuticals, nutraceuticals, cosmetics, and food and feed industries. Though, currently, productivity is still low and has restricted scale-up application in the commercial market, microbial production of astaxanthin has enormous prospects as it is a greener alternative to the predominating chemical synthesis. Over the years, Phaffia rhodozyma has attracted immense interest particularly in the field of biovalorization and sustainable production of natural nutraceuticals as a promising source of natural astaxanthin since it is able to use agro-food waste as inexpensive nutrient source. Many research works have, thus, been devoted to improving the astaxanthin yield from this yeast. Considering that the yeast was first isolated from tree exudates, the use of phytohormones and plant growth stimulators as prospective stimulants of astaxanthin production in the yeast is promising. Besides, it has been shown in several studies that phytohormones could improve cell growth and astaxanthin production of algae. Nevertheless, this option is less explored for P. rhodozyma. The few studies that have examined the effect of phytohormones on the yeast and its astaxanthin productivity reported positive results, with phytohormones such as 6-benzylaminopurin and gibberellic acid resulting in increased expression of carotenogenesis genes. Although the evidence available is scanty, the results are promising. KEY POINTS: • Phaffia rhodozyma is a promising source of natural astaxanthin • For industrialization, astaxanthin productivity of P. rhodozyma still needs optimization • Phytohormones could potentially augment astaxanthin yield of P. rhodozyma.
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Luna-Flores CH, Wang A, von Hellens J, Speight RE. Towards commercial levels of astaxanthin production in Phaffia rhodozyma. J Biotechnol 2022; 350:42-54. [DOI: 10.1016/j.jbiotec.2022.04.001] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/03/2021] [Revised: 03/23/2022] [Accepted: 04/05/2022] [Indexed: 01/01/2023]
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Zhang J, Li Q, Lu Y, Guan X, Liu J, Xu N, Cai C, Li X, Nan B, Liu J, Wang Y. Astaxanthin overproduction of Phaffia rhodozyma PR106 under titanium dioxide stress by transcriptomics and metabolic regulation analysis. BIORESOURCE TECHNOLOGY 2021; 342:125957. [PMID: 34555753 DOI: 10.1016/j.biortech.2021.125957] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/29/2021] [Revised: 09/10/2021] [Accepted: 09/12/2021] [Indexed: 06/13/2023]
Abstract
In this study, astaxanthin yield of Phaffia rhodozyma PR106 increased significantly under titanium dioxide (TiO2) stress, and the yield of lycopene and β-carotene also increased significantly, as well as the yield of violaxanthin and lutein significantly decreased; in addition, TiO2 stress promoted cell division and changed cell morphology of PR106. Then, the mechanism of increasing astaxanthin yield was studied by transcriptomics and related metabolic regulation. The results showed that astaxanthin accumulation in PR106 was not directly related to mRNA transcription and post-translational modifications regulation under TiO2 stress; TiO2 stress accelerated glucose uptake of yeast, promoted reuse of ethanol, and increased the formation of acetyl-CoA and ATP. The more carbon flux was shifted to astaxanthin synthesis pathway and weakened carotenoids accumulation in astaxanthin branch pathway to improve the astaxanthin production of PR106. The metabolism regulation of ROS could continue in the PR106 strain.
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Affiliation(s)
- Jing Zhang
- College of Food Science and Engineering, Jilin Agricultural University, Changchun, China; Jilin Province Innovation Center for Food Biological Manufacture, Jilin Agricultural University, Changchun, China
| | - Qingru Li
- College of Food Science and Engineering, Jilin Agricultural University, Changchun, China; Jilin Province Innovation Center for Food Biological Manufacture, Jilin Agricultural University, Changchun, China
| | - Yanhong Lu
- College of Food Science and Engineering, Jilin Agricultural University, Changchun, China; Jilin Province Innovation Center for Food Biological Manufacture, Jilin Agricultural University, Changchun, China
| | - Xiaoyu Guan
- College of Food Science and Engineering, Jilin Agricultural University, Changchun, China; Jilin Province Innovation Center for Food Biological Manufacture, Jilin Agricultural University, Changchun, China
| | - Jiahuan Liu
- College of Food Science and Engineering, Jilin Agricultural University, Changchun, China; Jilin Province Innovation Center for Food Biological Manufacture, Jilin Agricultural University, Changchun, China
| | - Na Xu
- College of Food Science and Engineering, Jilin Agricultural University, Changchun, China; Jilin Province Innovation Center for Food Biological Manufacture, Jilin Agricultural University, Changchun, China
| | - Chunyu Cai
- College of Food Science and Engineering, Jilin Agricultural University, Changchun, China; Jilin Province Innovation Center for Food Biological Manufacture, Jilin Agricultural University, Changchun, China
| | - Xia Li
- College of Food Science and Engineering, Jilin Agricultural University, Changchun, China; Jilin Province Innovation Center for Food Biological Manufacture, Jilin Agricultural University, Changchun, China
| | - Bo Nan
- College of Food Science and Engineering, Jilin Agricultural University, Changchun, China; Jilin Province Innovation Center for Food Biological Manufacture, Jilin Agricultural University, Changchun, China
| | - Jingsheng Liu
- College of Food Science and Engineering, Jilin Agricultural University, Changchun, China; National Engineering Laboratory for Wheat and Corn Deep Processing, Changchun, China
| | - Yuhua Wang
- College of Food Science and Engineering, Jilin Agricultural University, Changchun, China; Jilin Province Innovation Center for Food Biological Manufacture, Jilin Agricultural University, Changchun, China; National Engineering Laboratory for Wheat and Corn Deep Processing, Changchun, China.
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Ahmadi AR, Ayazi-Nasrabadi R. Astaxanthin protective barrier and its ability to improve the health in patients with COVID-19. IRANIAN JOURNAL OF MICROBIOLOGY 2021; 13:434-441. [PMID: 34557270 PMCID: PMC8421583 DOI: 10.18502/ijm.v13i4.6965] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Indexed: 12/19/2022]
Abstract
Inflammation acts like a double-edged sword and can be harmful if not appropriately controlled. COVID-19 is created through a novel species of coronavirus SARS-CoV-2 (2019-nCoV). Elevated levels of inflammatory factors such as interleukin-6 (IL-6), tumor necrosis factor-alpha (TNF-α), etc. lead to Acute Respiratory Distress Syndrome (ARDS) and severe complications of infection in the lungs of coronavirus-infected patients. Astaxanthin is a natural and potent carotenoid with powerful antioxidant activity as well as an anti-inflammatory agent that supports good health. The effects of astaxanthin on the regulation of cyclooxygenase-2 (COX-2) pathways and the reduction and suppression of cytokines and other inflammatory agents such as IL-6 and TNF-α have already been identified. Therefore, these unique features can make this natural compound an excellent option to minimize inflammation and its consequences.
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Affiliation(s)
- Ali-Reza Ahmadi
- Department of Biomedical Sciences, Women Research Center, Alzahra University, Tehran, Iran
| | - Roya Ayazi-Nasrabadi
- Department of Biomedical Sciences, Women Research Center, Alzahra University, Tehran, Iran
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8
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Chatragadda R, Dufossé L. Ecological and Biotechnological Aspects of Pigmented Microbes: A Way Forward in Development of Food and Pharmaceutical Grade Pigments. Microorganisms 2021; 9:637. [PMID: 33803896 PMCID: PMC8003166 DOI: 10.3390/microorganisms9030637] [Citation(s) in RCA: 28] [Impact Index Per Article: 9.3] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/01/2021] [Revised: 03/04/2021] [Accepted: 03/15/2021] [Indexed: 12/17/2022] Open
Abstract
Microbial pigments play multiple roles in the ecosystem construction, survival, and fitness of all kinds of organisms. Considerably, microbial (bacteria, fungi, yeast, and microalgae) pigments offer a wide array of food, drug, colorants, dyes, and imaging applications. In contrast to the natural pigments from microbes, synthetic colorants are widely used due to high production, high intensity, and low cost. Nevertheless, natural pigments are gaining more demand over synthetic pigments as synthetic pigments have demonstrated side effects on human health. Therefore, research on microbial pigments needs to be extended, explored, and exploited to find potential industrial applications. In this review, the evolutionary aspects, the spatial significance of important pigments, biomedical applications, research gaps, and future perspectives are detailed briefly. The pathogenic nature of some pigmented bacteria is also detailed for awareness and safe handling. In addition, pigments from macro-organisms are also discussed in some sections for comparison with microbes.
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Affiliation(s)
- Ramesh Chatragadda
- Biological Oceanography Division (BOD), Council of Scientific and Industrial Research-National Institute of Oceanography (CSIR-NIO), Dona Paula 403004, Goa, India
| | - Laurent Dufossé
- Chemistry and Biotechnology of Natural Products (CHEMBIOPRO Lab), Ecole Supérieure d’Ingénieurs Réunion Océan Indien (ESIROI), Département Agroalimentaire, Université de La Réunion, F-97744 Saint-Denis, France
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9
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Enhancing Astaxanthin Biosynthesis by Rhodosporidium toruloides Mutants and Optimization of Medium Compositions Using Response Surface Methodology. Processes (Basel) 2020. [DOI: 10.3390/pr8040497] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022] Open
Abstract
Astaxanthin is a valuable carotenoid, which has been approved as a food coloring by the US Food and Drug Administration and is considered as a food dye by the European Union (European Commission). This work aimed to attain Rhodosporidium toruloides mutants for enhanced astaxanthin accumulation using ultraviolet (UV) and gamma irradiation mutagenesis. Gamma irradiation was shown to be more efficient than UV for producing astaxanthin-overproducer. Among the screened mutants, G17, a gamma-induced mutant, exhibited the highest astaxanthin production, which was significantly higher than that of the wild strain. Response surface methodology was then applied to optimize the medium compositions for maximizing astaxanthin production by the mutant G17. The optimal medium compositions for the cultivation of G17 were determined as a peptone concentration of 19.75 g/L, malt extract concentration of 13.56 g/L, and glucose concentration of 19.92 g/L, with the maximum astaxanthin yield of 3021.34 µg/L ± 16.49 µg/L. This study suggests that the R. toruloides mutant (G17) is a potential candidate for astaxanthin production.
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10
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Hu HF, Zhou HY, Cheng GP, Xue YP, Wang YS, Zheng YG. Improvement of R-2-(4-hydroxyphenoxy) propionic acid biosynthesis of Beauveria bassiana by combined mutagenesis. Biotechnol Appl Biochem 2019; 67:343-353. [PMID: 31846537 DOI: 10.1002/bab.1872] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/04/2019] [Accepted: 12/05/2019] [Indexed: 12/16/2022]
Abstract
R-2-(4-hydroxyphenoxy)propionicacid (HPOPA) is a valuable intermediate for the synthesis of enantiomerically pure aryloxyphenoxypropionic acid herbicides. In this work, to improve the HPOPA biosynthesis by Beauveria bassiana ZJB16002 from the substrate R-2-phenoxypropionic acid (POPA), the original HPOPA producer B. bassiana ZJB16002 was subjected to physical mutagenesis with 137 Cs-γ irradiation and chemical mutagen N-methyl-N'-nitro-N-nitrasoguanidine (NTG) induced mutagenesis. The effects of different treatment doses of the mutagens on the lethal rate and positive mutation rate were investigated, and the results showed that the optimal 137 Cs-γirradiation dose and NTG concentration was 850 Gy and 500 µg/mL, respectively. Under these conditions, a mutant strain CCN-7 with the highest HPOPA production capacity was obtained through two rounds of 137 Cs-γ irradiation treatment followed by one round of NTG mutagenesis. At the substrate (POPA) concentration of 50 g/L, HPOPA titer of CCN-7 reached 36.88 g/L, which was 9.73-fold higher than the parental strain. The morphology of the wild-type and mutant strain was compared and the results might provide helpful information in exploration of the correlation of morphology and biochemical features of B. bassiana.
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Affiliation(s)
- Hai-Feng Hu
- Key Laboratory of Bioorganic Synthesis of Zhejiang Province, College of Biotechnology and Bioengineering, Zhejiang University of Technology, Hangzhou, People's Republic of China.,Engineering Research Center of Bioconversion and Biopurification of Ministry of Education, Zhejiang University of Technology, Hangzhou, People's Republic of China.,The National and Local Joint Engineering Research Center for Biomanufacturing of Chiral Chemicals, Zhejiang University of Technology, Hangzhou, People's Republic of China
| | - Hai-Yan Zhou
- Key Laboratory of Bioorganic Synthesis of Zhejiang Province, College of Biotechnology and Bioengineering, Zhejiang University of Technology, Hangzhou, People's Republic of China.,Engineering Research Center of Bioconversion and Biopurification of Ministry of Education, Zhejiang University of Technology, Hangzhou, People's Republic of China.,The National and Local Joint Engineering Research Center for Biomanufacturing of Chiral Chemicals, Zhejiang University of Technology, Hangzhou, People's Republic of China
| | - Gao-Ping Cheng
- Key Laboratory of Bioorganic Synthesis of Zhejiang Province, College of Biotechnology and Bioengineering, Zhejiang University of Technology, Hangzhou, People's Republic of China.,Engineering Research Center of Bioconversion and Biopurification of Ministry of Education, Zhejiang University of Technology, Hangzhou, People's Republic of China.,The National and Local Joint Engineering Research Center for Biomanufacturing of Chiral Chemicals, Zhejiang University of Technology, Hangzhou, People's Republic of China
| | - Ya-Ping Xue
- Key Laboratory of Bioorganic Synthesis of Zhejiang Province, College of Biotechnology and Bioengineering, Zhejiang University of Technology, Hangzhou, People's Republic of China.,Engineering Research Center of Bioconversion and Biopurification of Ministry of Education, Zhejiang University of Technology, Hangzhou, People's Republic of China.,The National and Local Joint Engineering Research Center for Biomanufacturing of Chiral Chemicals, Zhejiang University of Technology, Hangzhou, People's Republic of China
| | - Yuan-Shan Wang
- Key Laboratory of Bioorganic Synthesis of Zhejiang Province, College of Biotechnology and Bioengineering, Zhejiang University of Technology, Hangzhou, People's Republic of China.,Engineering Research Center of Bioconversion and Biopurification of Ministry of Education, Zhejiang University of Technology, Hangzhou, People's Republic of China.,The National and Local Joint Engineering Research Center for Biomanufacturing of Chiral Chemicals, Zhejiang University of Technology, Hangzhou, People's Republic of China
| | - Yu-Guo Zheng
- Key Laboratory of Bioorganic Synthesis of Zhejiang Province, College of Biotechnology and Bioengineering, Zhejiang University of Technology, Hangzhou, People's Republic of China.,Engineering Research Center of Bioconversion and Biopurification of Ministry of Education, Zhejiang University of Technology, Hangzhou, People's Republic of China.,The National and Local Joint Engineering Research Center for Biomanufacturing of Chiral Chemicals, Zhejiang University of Technology, Hangzhou, People's Republic of China
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12
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Strain improvement of Trichoderma viride for increased cellulase production by irradiation of electron and (12)C(6+)-ion beams. Biotechnol Lett 2016; 38:983-9. [PMID: 26932902 DOI: 10.1007/s10529-016-2066-7] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/09/2015] [Accepted: 02/25/2016] [Indexed: 10/22/2022]
Abstract
OBJECTIVES To improve cellulase production and activity, Trichoderma viride GSICC 62010 was subjected to mutation involving irradiation with an electron beam and subsequently with a (12)C(6+)-ion beam. RESULTS Mutant CIT 626 was the most promising cellulase producer after preliminary and secondary screening. Soluble protein production and cellulase activities were increased mutifold. The optimum temperature, pH and culture time for the maximum cellulase production of the selected mutant were 35 °C, pH 5 and 6 days. The highest cellulase production was obtained using wheat bran. The prepared cellulases from T. viride CIT 626 had twice the hydrolytic performance with sawdust (83 %) than that from the parent strain (42.5 %). Furthermore, molecular studies demonstrated that there were some key mutation sites suggesting that some amino acid changes in the protein caused by base mutations had led to the enhanced cellulase production and activity. CONCLUSIONS Mutagenesis with electron and (12)C(6+)-ion beams could be developed as an effective tool for improvement of cellulase producing strains.
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Cheng J, Li K, Yang Z, Zhou J, Cen K. Enhancing the growth rate and astaxanthin yield of Haematococcus pluvialis by nuclear irradiation and high concentration of carbon dioxide stress. BIORESOURCE TECHNOLOGY 2016; 204:49-54. [PMID: 26773378 DOI: 10.1016/j.biortech.2015.12.076] [Citation(s) in RCA: 64] [Impact Index Per Article: 8.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/04/2015] [Revised: 12/25/2015] [Accepted: 12/26/2015] [Indexed: 05/20/2023]
Abstract
Unicellular green microalgae Haematococcus pluvialis was mutated with (60)Co-γ irradiation to promote growth rate and increase astaxanthin yield under high concentration of CO2 stress. The average specific growth rate of H. pluvialis mutated with 4000 Gy γ-ray irradiation was increased by 15% compared with the original strain with air aeration. The mutant grew best with 6% CO2 (the maximum specific growth rate was 0.60/d) when it was cultured with high concentrations of CO2 (2-10%). The peak biomass productivity (0.16 g/L/d) of the mutant cultured with 6% CO2 was 82% higher than that of the mutant with air. The astaxanthin yield and lipid content of the mutant induced with 6% CO2 and high light (108 μmol photons m(-2) s(-1)) increased to 46.0mg/L and 45.9%, which were 2.4 and 1.3 times higher than those of the wild-type strain, respectively.
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Affiliation(s)
- Jun Cheng
- State Key Laboratory of Clean Energy Utilization, Zhejiang University, Hangzhou 310027, China.
| | - Ke Li
- State Key Laboratory of Clean Energy Utilization, Zhejiang University, Hangzhou 310027, China
| | - Zongbo Yang
- State Key Laboratory of Clean Energy Utilization, Zhejiang University, Hangzhou 310027, China
| | - Junhu Zhou
- State Key Laboratory of Clean Energy Utilization, Zhejiang University, Hangzhou 310027, China
| | - Kefa Cen
- State Key Laboratory of Clean Energy Utilization, Zhejiang University, Hangzhou 310027, China
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Liu XY, Shen XY, Fan L, Gao J, Hou CL. High-efficiency biosynthesis of hypocrellin A in Shiraia sp. using gamma-ray mutagenesis. Appl Microbiol Biotechnol 2016; 100:4875-83. [PMID: 26767989 DOI: 10.1007/s00253-015-7222-9] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/07/2015] [Revised: 11/05/2015] [Accepted: 11/29/2015] [Indexed: 10/22/2022]
Abstract
Hypocrellin A (HA), well known as one of the best natural pigments and bioactive agent to treat skin diseases, is further anticipated to play a vital role in photodynamic therapy (PDT) in anticancer and antiviral treatments. In this study, an HA-producing strain ZZZ816 (Shiraia sp.) was isolated from the moso bamboo (Phyllostachys edulis) seeds, and gamma irradiation was used to mutagenize spores of the original strain. After treatment with cobalt-60 gamma ((60)Coγ) with different doses (20, 50, 80, 100, 150, 180, 300, and 500 Gy), the 100 Gy was selected as the optimal condition, which led to 77.2 % lethality of spores and 35 % positive mutant frequency. The extracted compound of the most excellent HA-producing strain (H-4-2) was precisely analyzed by a combination of seven detection methods, and the maximum HA content was shown to reach 2018.3 mg/L. HA production in H-4-2 increased by 414.9 % compared to that of original strain ZZZ816 (392 mg/L) and was significantly higher than all the other industrial HA-producing strains in published reports.
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Affiliation(s)
- Xin-Yao Liu
- College of Life Science, Capital Normal University, Beijing, 100048, People's Republic of China
| | - Xiao-Ye Shen
- College of Life Science, Capital Normal University, Beijing, 100048, People's Republic of China.
| | - Li Fan
- College of Life Science, Capital Normal University, Beijing, 100048, People's Republic of China
| | - Jian Gao
- Key Laboratory of Bamboo and Rattan Science and Technology of the SFA, International Centre for Bamboo and Rattan, Beijing, 100102, People's Republic of China
| | - Cheng-Lin Hou
- College of Life Science, Capital Normal University, Beijing, 100048, People's Republic of China.
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Hlavova M, Turoczy Z, Bisova K. Improving microalgae for biotechnology — From genetics to synthetic biology. Biotechnol Adv 2015; 33:1194-203. [DOI: 10.1016/j.biotechadv.2015.01.009] [Citation(s) in RCA: 80] [Impact Index Per Article: 8.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/27/2014] [Revised: 01/11/2015] [Accepted: 01/17/2015] [Indexed: 01/01/2023]
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16
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Frontiers of yeast metabolic engineering: diversifying beyond ethanol and Saccharomyces. Curr Opin Biotechnol 2013; 24:1023-30. [DOI: 10.1016/j.copbio.2013.03.005] [Citation(s) in RCA: 92] [Impact Index Per Article: 8.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/02/2012] [Revised: 03/05/2013] [Accepted: 03/07/2013] [Indexed: 01/09/2023]
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17
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Enhanced bioaccumulation of astaxanthin in Phaffia rhodozyma by utilising low-cost agro products as fermentation substrate. BIOCATALYSIS AND AGRICULTURAL BIOTECHNOLOGY 2013. [DOI: 10.1016/j.bcab.2012.11.002] [Citation(s) in RCA: 28] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/29/2022]
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