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Garmaroody ER, PahnehKolaei ND, Ramezani O, Hamedi S. Detoxification Approaches of Bagasse Pith Hydrolysate Affecting Xylitol Production by Rhodotorula mucilaginosa. Appl Biochem Biotechnol 2024; 196:129-144. [PMID: 37103733 DOI: 10.1007/s12010-023-04539-1] [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] [Accepted: 04/11/2023] [Indexed: 04/28/2023]
Abstract
In this study, the potential of bagasse pith (the waste of sugar and paper industry) was investigated for bio-xylitol production for the first time. Xylose-rich hydrolysate was prepared using 8% dilute sulfuric acid, at 120 °C for 90 min. Then, the acid-hydrolyzed solution was detoxified by individual overliming (OL), active carbon (AC), and their combination (OL+AC). The amounts of reducing sugars and inhibitors (furfural and hydroxyl methyl furfural) were measured after acid pre-treatment and detoxification process. Thereafter, xylitol was produced from detoxified hydrolysate by Rhodotorula mucilaginosa yeast. Results showed that after acid hydrolysis, the sugar yield was 20%. Detoxification by overliming and active carbon methods increased the reducing sugar content up to 65% and 36% and decreased the concentration of inhibitors to >90% and 16%, respectively. Also, combined detoxification caused an increase in the reducing sugar content (>73%) and a complete removal of inhibitors. The highest productivity of xylitol (0.366 g/g) by yeast was attained after the addition of 100 g/l non-detoxified xylose-rich hydrolysate into fermentation broth after 96 h, while the xylitol productivity enhanced to 0.496 g/g after adding the similar amount of xylose-rich hydrolysate detoxified by combined method (OL+AC2.5%).
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Affiliation(s)
- Esmaeil Rasooly Garmaroody
- Dept. of Bio-refinery, Faculty of New Technologies, Zirab Campus, Shahid Beheshti University, Savadkooh, Mazandaran, Iran
| | - Niloufar Davoodi PahnehKolaei
- Dept. of Bio-refinery, Faculty of New Technologies, Zirab Campus, Shahid Beheshti University, Savadkooh, Mazandaran, Iran
| | - Omid Ramezani
- Dept. of Bio-refinery, Faculty of New Technologies, Zirab Campus, Shahid Beheshti University, Savadkooh, Mazandaran, Iran.
| | - Sepideh Hamedi
- Dept. of Bio-refinery, Faculty of New Technologies, Zirab Campus, Shahid Beheshti University, Savadkooh, Mazandaran, Iran
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Wu G, Alriksson B, Jönsson LJ. Conditioning of pretreated birch by liquid-liquid organic extractions to improve yeast fermentability and enzymatic digestibility. RSC Adv 2023; 13:20023-20030. [PMID: 37409043 PMCID: PMC10318483 DOI: 10.1039/d3ra02210b] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/03/2023] [Accepted: 06/23/2023] [Indexed: 07/07/2023] Open
Abstract
By-products from hydrothermal pretreatment of lignocellulosic biomass inhibit enzymatic saccharification and microbial fermentation. Three long-chain organic extractants (Alamine 336, Aliquat 336 and Cyanex 921) were compared to two conventional organic solvents (ethyl acetate and xylene) with regard to conditioning of birch wood pretreatment liquid (BWPL) for improved fermentation and saccharification. In the fermentation experiments, extraction with Cyanex 921 resulted in the best ethanol yield, 0.34 ± 0.02 g g-1 on initial fermentable sugars. Extraction with xylene also resulted in a relatively high yield, 0.29 ± 0.02 g g-1, while cultures consisting of untreated BWPL and BWPL treated with the other extractants exhibited no ethanol formation. Aliquat 336 was most efficient with regard to removing by-products, but the residual Aliquat after the extraction was toxic to yeast cells. Enzymatic digestibility increased by 19-33% after extraction with the long-chain organic extractants. The investigation demonstrates that conditioning with long-chain organic extractants has the potential to relieve inhibition of both enzymes and microbes.
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Affiliation(s)
- Guochao Wu
- Shandong Key Lab of Edible Mushroom Technology, School of Agriculture, Ludong University 264025 Yantai China
- Department of Chemistry, Umeå University SE-901 87 Umeå Sweden
| | - Björn Alriksson
- RISE Research Institutes of Sweden AB SE-891 22 Örnsköldsvik Sweden
| | - Leif J Jönsson
- Department of Chemistry, Umeå University SE-901 87 Umeå Sweden
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Zhai R, Hu J, Jin M. Towards efficient enzymatic saccharification of pretreated lignocellulose: Enzyme inhibition by lignin-derived phenolics and recent trends in mitigation strategies. Biotechnol Adv 2022; 61:108044. [PMID: 36152893 DOI: 10.1016/j.biotechadv.2022.108044] [Citation(s) in RCA: 12] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/08/2022] [Revised: 08/24/2022] [Accepted: 09/19/2022] [Indexed: 01/01/2023]
Abstract
Lignocellulosic biorefinery based on its sugar-platform has been considered as an efficient strategy to replace fossil fuel-based refinery. In the bioconversion process, pretreatment is an essential step to firstly open up lignocellulose cell wall structure and enhance the accessibility of carbohydrates to hydrolytic enzymes. However, various lignin and/or carbohydrates degradation products (e.g. phenolics, 5-hydroxymethylfurfural, furfural) also generated during pretreatment, which severely inhibit the following enzymatic hydrolysis and the downstream fermentation process. Among them, the lignin derived phenolics have been considered as the most inhibitory compounds and their inhibitory effects are highly dependent on the source of biomass and the type of pretreatment strategy. Although liquid-solid separation and subsequent washing can remove the lignin derived phenolics and other inhibitors, this is undesirable in the realistic industrial application where the whole slurry of pretreated biomass need to be directly used in the hydrolysis process. This review summarizes the phenolics formation mechanism for various commonly applied pretreatment methods and discusses the key factors that affect the inhibitory effect of phenolics on cellulose hydrolysis. In addition, the recent achievements on the rational design of inhibition mitigation strategies to boost cellulose hydrolysis for sugar-platform biorefinery are also introduced. This review also provides guidance for rational design detoxification strategies to facilitate whole slurry hydrolysis which helps to realize the industrialization of lignocellulose biorefinery.
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Affiliation(s)
- Rui Zhai
- School of Environmental and Biological Engineering, Nanjing University of Science and Technology, 200 Xiaolingwei Street, Nanjing 210094, China
| | - Jianguang Hu
- Department of Chemical and Petroleum Engineering, University of Calgary, Calgary T2N 1N4, Canada
| | - Mingjie Jin
- School of Environmental and Biological Engineering, Nanjing University of Science and Technology, 200 Xiaolingwei Street, Nanjing 210094, China.
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Growth and phycocyanin production with Galdieria sulphuraria UTEX 2919 using xylose, glucose, and corn stover hydrolysates under heterotrophy and mixotrophy. ALGAL RES 2022. [DOI: 10.1016/j.algal.2022.102752] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
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Maragoudaki L, Atsonios K, Kourkoumpas DS, Grammelis P. Process integration and scale up considerations of Typha domingensis macrophyte bioconversion into ethanol. Biochem Eng J 2022. [DOI: 10.1016/j.bej.2022.108404] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/02/2022]
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Kubisch C, Ochsenreither K. Detoxification of a pyrolytic aqueous condensate from wheat straw for utilization as substrate in Aspergillus oryzae DSM 1863 cultivations. BIOTECHNOLOGY FOR BIOFUELS AND BIOPRODUCTS 2022; 15:18. [PMID: 35418301 PMCID: PMC8855548 DOI: 10.1186/s13068-022-02115-z] [Citation(s) in RCA: 6] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/05/2021] [Accepted: 01/30/2022] [Indexed: 04/15/2023]
Abstract
BACKGROUND The pyrolytic aqueous condensate (PAC) formed during the fast pyrolysis of wheat straw contains a variety of organic carbons and might therefore potentially serve as an inexpensive substrate for microbial growth. One of its main components is acetic acid, which was recently shown to be a suitable carbon source for the filamentous fungus Aspergillus oryzae. However, the condensate also contains numerous toxic compounds that inhibit fungal growth and result in a tolerance of only about 1%. Therefore, to enable the use of the PAC as sole substrate for A. oryzae cultivations, a pretreatment seems to be necessary. RESULTS Various conditions for treatments with activated carbon, overliming, rotary evaporation and laccase were evaluated regarding fungal growth and the content of inhibitory model substances. Whereas the first three methods considerably increased the fungal tolerance to up to 1.625%, 12.5% and 30%, respectively, the enzymatic treatment did not result in any improvement. The optimum carbon load for the treatment with activated carbon was identified to be 10% (w/v) and overliming should ideally be performed at 100 °C and an initial pH of 12. The best detoxification results were achieved with rotary evaporation at 200 mbar as a complete removal of guaiacol and a strong reduction in the concentration of acetol, furfural, 2-cyclopenten-1-one and phenol by 84.9%, 95.4%, 97.7% and 86.2%, respectively, were observed. Subsequently, all possible combinations of the effective single methods were performed and rotary evaporation followed by overliming and activated carbon treatment proved to be most efficient as it enabled growth in 100% PAC shake-flask cultures and resulted in a maximum cell dry weight of 5.21 ± 0.46 g/L. CONCLUSION This study provides a comprehensive insight into the detoxification efficiency of a variety of treatment methods at multiple conditions. It was revealed that with a suitable combination of these methods, PAC toxicity can be reduced to such an extent that growth on pure condensate is possible. This can be considered as a first important step towards a microbial valorization of the pyrolytic side-stream with A. oryzae.
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Affiliation(s)
- Christin Kubisch
- Institute of Process Engineering in Life Sciences 2-Technical Biology, Karlsruhe Institute of Technology (KIT), Fritz-Haber-Weg 4, 76131, Karlsruhe, Germany.
| | - Katrin Ochsenreither
- Institute of Process Engineering in Life Sciences 2-Technical Biology, Karlsruhe Institute of Technology (KIT), Fritz-Haber-Weg 4, 76131, Karlsruhe, Germany
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Jarboe LR, Khalid A, Ocasio ER, Fashkami KN. Extrapolation of design strategies for lignocellulosic biomass conversion to the challenge of plastic waste. J Ind Microbiol Biotechnol 2022; 49:6510821. [PMID: 35040946 PMCID: PMC9119000 DOI: 10.1093/jimb/kuac001] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/07/2021] [Accepted: 01/18/2022] [Indexed: 11/12/2022]
Abstract
The goal of cost-effective production of fuels and chemicals from biomass has been a substantial driver of the development of the field of Metabolic Engineering. The resulting design principles and procedures provide a guide for the development of cost-effective methods for degradation, and possibly even valorization, of plastic wastes. Here we highlight these parallels, using the creative work of Lonnie O'Neal (Neal) Ingram in enabling production of fuels and chemicals from lignocellulosic biomass, with a focus on ethanol production as an exemplar process.
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Affiliation(s)
- Laura R Jarboe
- Department of Chemical and Biological Engineering, Iowa State University, Ames, IA 50011, USA
| | - Ammara Khalid
- Department of Chemical and Biological Engineering, Iowa State University, Ames, IA 50011, USA
| | - Efrain Rodriguez Ocasio
- Department of Chemical and Biological Engineering, Iowa State University, Ames, IA 50011, USA
| | - Kimia Noroozi Fashkami
- Department of Chemical and Biological Engineering, Iowa State University, Ames, IA 50011, USA
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Salas-Navarrete PC, de Oca Miranda AIM, Martínez A, Caspeta L. Evolutionary and reverse engineering to increase Saccharomyces cerevisiae tolerance to acetic acid, acidic pH, and high temperature. Appl Microbiol Biotechnol 2021; 106:383-399. [PMID: 34913993 DOI: 10.1007/s00253-021-11730-z] [Citation(s) in RCA: 16] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/01/2021] [Revised: 12/01/2021] [Accepted: 12/03/2021] [Indexed: 11/24/2022]
Abstract
Saccharomyces cerevisiae scarcely grows on minimal media with acetic acid, acidic pH, and high temperatures. In this study, the adaptive laboratory evolution (ALE), whole-genome analysis, and reverse engineering approaches were used to generate strains tolerant to these conditions. The thermotolerant strain TTY23 and its parental S288C were evolved through 1 year, in increasing concentrations of acetic acid up to 12 g/L, keeping the pH ≤ 4. Of the 18 isolated strains, 9 from each ancestor, we selected the thermo-acid tolerant TAT12, derived from TTY23, and the acid tolerant AT22, derived from S288C. Both grew in minimal media with 12 g/L of acetic acid, pH 4, and 30 °C, and produced ethanol up to 29.25 ± 6 mmol/gDCW/h-neither of the ancestors thrived in these conditions. Furthermore, only the TAT12 grew on 2 g/L of acetic acid, pH 3, and 37 °C, and accumulated 16.5 ± 0.5 mmol/gDCW/h of ethanol. Whole-genome sequencing and transcriptomic analysis of this strain showed changes in the genetic sequence and transcription of key genes involved in the RAS-cAMP-PKA signaling pathway (RAS2, GPA2, and IRA2), the heat shock transcription factor (HSF1), and the positive regulator of replication initiation (SUM1), among others. By reverse engineering, the relevance of the combined mutations in the genes RAS2, HSF1, and SUM1 to the tolerance for acetic acid, low pH, and high temperature was confirmed. Alone, the RAS2 mutation yielded acid tolerance and HSF1 nutation thermotolerance. Increasing the thermo-acidic niche and acetic acid tolerance of S. cerevisiae can contribute to improve economic ethanol production. KEY POINTS: • Thermo-acid tolerant (TAT) yeast strains were generated by adaptive laboratory evolution. • The strain TAT12 thrived on non-native, thermo-acidic harmful conditions. • Mutations in RAS2, HSF1, and SUM1 genes rendered yeast thermo and acid tolerant.
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Affiliation(s)
- Prisciluis Caheri Salas-Navarrete
- Centro de Investigación en Biotecnología, Universidad Autónoma del Estado de Morelos, Av. Universidad 1001, Col. Chamilpa, C.P. 62209, Cuernavaca, Morelos, Mexico
| | - Arturo Iván Montes de Oca Miranda
- Centro de Investigación en Biotecnología, Universidad Autónoma del Estado de Morelos, Av. Universidad 1001, Col. Chamilpa, C.P. 62209, Cuernavaca, Morelos, Mexico
| | - Alfredo Martínez
- Departamento de Ingeniería Celular Y Biocatálisis, Instituto de Biotecnología, Universidad Nacional Autónoma de México, Av. Universidad 2001, Col. Chamilpa, C.P. 62210, Cuernavaca, Morelos, Mexico
| | - Luis Caspeta
- Departamento de Ingeniería Celular Y Biocatálisis, Instituto de Biotecnología, Universidad Nacional Autónoma de México, Av. Universidad 2001, Col. Chamilpa, C.P. 62210, Cuernavaca, Morelos, Mexico.
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Jilani SB, Prasad R, Yazdani SS. Overexpression of Oxidoreductase YghA Confers Tolerance of Furfural in Ethanologenic Escherichia coli Strain SSK42. Appl Environ Microbiol 2021; 87:e0185521. [PMID: 34586907 PMCID: PMC8579976 DOI: 10.1128/aem.01855-21] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/17/2021] [Accepted: 09/21/2021] [Indexed: 02/02/2023] Open
Abstract
Furfural is a common furan inhibitor formed due to dehydration of pentose sugars, like xylose, and acts as an inhibitor of microbial metabolism. Overexpression of NADH-specific FucO and deletion of NADPH-specific YqhD had been a successful strategy in the past in conferring tolerance against furfural in Escherichia coli, which highlights the importance of oxidoreductases in conferring tolerance against furfural. In a screen consisting of various oxidoreductases, dehydrogenases, and reductases, we identified the yghA gene as an overexpression target to confer tolerance against furfural. YghA preferably used NADH as a cofactor and had an apparent Km value of 0.03 mM against furfural. In the presence of 1 g liter-1 furfural and 10% xylose (wt/vol), yghA overexpression in an ethanologenic E. coli strain SSK42 resulted in an ethanol efficiency of ∼97%, with a 5.3-fold increase in ethanol titers compared to the control. YghA also exhibited activity against the less toxic inhibitor 5-hydroxymethyl furfural, which is formed due to dehydration of hexose sugars, and thus is a formidable target for overexpression in ethanologenic strain for fermentation of sugars in biomass hydrolysate. IMPORTANCE Lignocellulosic biomass represents an inexhaustible source of carbon for second-generation biofuels. Thermo-acidic pretreatment of biomass is performed to loosen the lignocellulosic fibers and make the carbon bioavailable for microbial metabolism. The pretreatment process also results in the formation of inhibitors that inhibit microbial metabolism and increase production costs. Furfural is a potent furan inhibitor that increases the toxicity of other inhibitors present in the hydrolysate. Thus, it is desirable to engineer furfural tolerance in E. coli for efficient fermentation of hydrolysate sugars.
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Affiliation(s)
- S. Bilal Jilani
- Microbial Engineering Group, International Center for Genetic Engineering and Biotechnology, New Delhi, India
- DBT-ICGEB Centre for Advanced Bioenergy Research, International Centre for Genetic Engineering and Biotechnology, New Delhi, India
- Institute of Biotechnology, Amity University, Manesar, Haryana, India
| | - Rajendra Prasad
- Institute of Biotechnology, Amity University, Manesar, Haryana, India
| | - Syed Shams Yazdani
- Microbial Engineering Group, International Center for Genetic Engineering and Biotechnology, New Delhi, India
- DBT-ICGEB Centre for Advanced Bioenergy Research, International Centre for Genetic Engineering and Biotechnology, New Delhi, India
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Sierra-Ibarra E, Alcaraz-Cienfuegos J, Vargas-Tah A, Rosas-Aburto A, Valdivia-López Á, Hernández-Luna MG, Vivaldo-Lima E, Martinez A. Ethanol production by Escherichia coli from detoxified lignocellulosic teak wood hydrolysates with high concentration of phenolic compounds. J Ind Microbiol Biotechnol 2021; 49:6382998. [PMID: 34617569 PMCID: PMC9118984 DOI: 10.1093/jimb/kuab077] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/12/2021] [Accepted: 10/01/2021] [Indexed: 11/13/2022]
Abstract
Teak wood residues were subjected to thermochemical pretreatment, enzymatic saccharification, and detoxification to obtain syrups with a high concentration of fermentable sugars for ethanol production with the ethanologenic Escherichia coli strain MS04. Teak is a hardwood, and thus a robust deconstructive pretreatment was applied followed by enzymatic saccharification. The resulting syrup contained 60 g L-1 glucose, 18 g L-1 xylose, 6 g L-1 acetate, less than 0.1 g L-1 of total furans, and 12 g L-1 of soluble phenolic compounds (SPC). This concentration of SPC is toxic to E. coli, and thus two detoxification strategies were assayed: 1) treatment with Coriolopsis gallica laccase followed by addition of activated carbon and 2) overliming with Ca(OH)2. These reduced the phenolic compounds by 40 and 76%, respectively. The detoxified syrups were centrifuged and fermented with E. coli MS04. Cultivation with the over-limed hydrolysate showed a 60% higher volumetric productivity (0.45 gETOH L-1 h-1). The bioethanol/sugars yield was over 90% in both strategies.
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Affiliation(s)
- Estefanía Sierra-Ibarra
- Departamento de Ingeniería Química, Facultad de Química, Universidad Nacional Autónoma de México, 04510 Ciudad de México, México
| | - Jorge Alcaraz-Cienfuegos
- Departamento de Ingeniería Química, Facultad de Química, Universidad Nacional Autónoma de México, 04510 Ciudad de México, México
| | - Alejandra Vargas-Tah
- Departamento de Ingeniería Celular y Biocatálisis, Instituto de Biotecnología, Universidad Nacional Autónoma de México. Av. Universidad 2001, Col. Chamilpa, Cuernavaca, Morelos 62210, México
| | - Alberto Rosas-Aburto
- Departamento de Ingeniería Química, Facultad de Química, Universidad Nacional Autónoma de México, 04510 Ciudad de México, México
| | - Ángeles Valdivia-López
- Departamento de Alimentos y Biotecnología, Facultad de Química, Universidad Nacional Autónoma de México, 04510 Ciudad de México, México
| | - Martín G Hernández-Luna
- Departamento de Ingeniería Química, Facultad de Química, Universidad Nacional Autónoma de México, 04510 Ciudad de México, México
| | - Eduardo Vivaldo-Lima
- Departamento de Ingeniería Química, Facultad de Química, Universidad Nacional Autónoma de México, 04510 Ciudad de México, México
| | - Alfredo Martinez
- Departamento de Ingeniería Celular y Biocatálisis, Instituto de Biotecnología, Universidad Nacional Autónoma de México. Av. Universidad 2001, Col. Chamilpa, Cuernavaca, Morelos 62210, México
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Zhang Y, Bao J. Tolerance of Trichosporon cutaneum to lignin derived phenolic aldehydes facilitate the cell growth and cellulosic lipid accumulation. J Biotechnol 2021; 343:32-37. [PMID: 34537255 DOI: 10.1016/j.jbiotec.2021.09.009] [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] [Received: 04/16/2021] [Revised: 07/29/2021] [Accepted: 09/11/2021] [Indexed: 11/15/2022]
Abstract
Phenolic aldehydes are the major inhibitors from lignocellulose pretreatment. Previous studies show that oleaginous yeasts are difficult to survive in lignocellulosic hydrolysates even after the removal of furan aldehydes and organic acids inhibitors. This study investigated the cell viability, sugar consumption and lipid accumulation of the major oleaginous yeasts including Trichosporon cutaneum, Rhodosporidium toruloides, Rhodotorula glutinis, Yarrowia lipolytica in wheat straw hydrolysate containing only phenolic aldehydes after furan aldehydes and organic acids were selectively degraded by microorganisms. The results confirmed that the existence of residual phenolic aldehydes was the major reason for poor cell growth and metabolism of oleaginous yeasts. Only T. cutaneum demonstrated the higher tolerance by biodegrading phenolic aldehydes and the satisfactory cell growth and lipid production were obtained. This study revealed that T. cutaneum might be one of the promising cell factories for microbial lipid production from lignocellulosic feedstock.
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Affiliation(s)
- Yi Zhang
- State Key Laboratory of Bioreactor Engineering, East China University of Science and Technology, 130 Meilong Road, Shanghai 200237, China
| | - Jie Bao
- State Key Laboratory of Bioreactor Engineering, East China University of Science and Technology, 130 Meilong Road, Shanghai 200237, China.
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Wang L, Wang X, He ZQ, Zhou SJ, Xu L, Tan XY, Xu T, Li BZ, Yuan YJ. Engineering prokaryotic regulator IrrE to enhance stress tolerance in budding yeast. BIOTECHNOLOGY FOR BIOFUELS 2020; 13:193. [PMID: 33292418 PMCID: PMC7706047 DOI: 10.1186/s13068-020-01833-6] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 08/17/2020] [Accepted: 11/16/2020] [Indexed: 06/12/2023]
Abstract
BACKGROUND Stress tolerance is one of the important desired microbial traits for industrial bioprocesses, and global regulatory protein engineering is an efficient approach to improve strain tolerance. In our study, IrrE, a global regulatory protein from the prokaryotic organism Deinococcus radiodurans, was engineered to confer yeast improved tolerance to the inhibitors in lignocellulose hydrolysates or high temperatures. RESULTS Three IrrE mutations were developed through directed evolution, and the expression of these mutants could improve the yeast fermentation rate by threefold or more in the presence of multiple inhibitors. Subsequently, the tolerance to multiple inhibitors of single-site mutants based on the mutations from the variants were then evaluated, and 11 mutants, including L65P, I103T, E119V, L160F, P162S, M169V, V204A, R244G, Base 824 Deletion, V299A, and A300V were identified to be critical for the improved representative inhibitors, i.e., furfural, acetic acid and phenol (FAP) tolerance. Further studies indicated that IrrE caused genome-wide transcriptional perturbation in yeast, and the mutant I24 led to the rapid growth of Saccharomyces cerevisiae by primarily regulating the transcription level of transcription activators/factors, protecting the intracellular environment and enhancing the antioxidant capacity under inhibitor environments, which reflected IrrE plasticity. Meanwhile, we observed that the expression of the wild-type or mutant IrrE could also protect Saccharomyces cerevisiae from the damage caused by thermal stress. The recombinant yeast strains were able to grow with glucose at 42 ℃. CONCLUSIONS IrrE from Deinococcus radiodurans can be engineered as a tolerance-enhancer for Saccharomyces cerevisiae. Systematic research on the regulatory model and mechanism of a prokaryotic global regulatory factor IrrE to increase yeast tolerance provided valuable insights for the improvements in microbial tolerance to complex industrial stress conditions.
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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, 300072 P.R. China
- Synthetic Biology Research Platform, Collaborative Innovation Center of Chemical Science and Engineering (Tianjin), Tianjin University, Tianjin, 300072 P.R. China
| | - Xin Wang
- State Key Laboratory of Materials-Oriented Chemical Engineering, College of Biotechnology and Pharmaceutical Engineering, Nanjing Tech University, Nanjing, 211816 Jiangsu P.R. China
| | - Zhi-Qiang He
- Frontiers Science Center for Synthetic Biology and Key Laboratory of Systems Bioengineering (Ministry of Education), School of Chemical Engineering and Technology, Tianjin University, Tianjin, 300072 P.R. China
- Synthetic Biology Research Platform, Collaborative Innovation Center of Chemical Science and Engineering (Tianjin), Tianjin University, Tianjin, 300072 P.R. China
| | - Si-Jie Zhou
- Frontiers Science Center for Synthetic Biology and Key Laboratory of Systems Bioengineering (Ministry of Education), School of Chemical Engineering and Technology, Tianjin University, Tianjin, 300072 P.R. China
- Synthetic Biology Research Platform, Collaborative Innovation Center of Chemical Science and Engineering (Tianjin), Tianjin University, Tianjin, 300072 P.R. China
| | - Li Xu
- Frontiers Science Center for Synthetic Biology and Key Laboratory of Systems Bioengineering (Ministry of Education), School of Chemical Engineering and Technology, Tianjin University, Tianjin, 300072 P.R. China
- Synthetic Biology Research Platform, Collaborative Innovation Center of Chemical Science and Engineering (Tianjin), Tianjin University, Tianjin, 300072 P.R. China
| | - Xiao-Yu 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, 300072 P.R. China
- Synthetic Biology Research Platform, Collaborative Innovation Center of Chemical Science and Engineering (Tianjin), Tianjin University, Tianjin, 300072 P.R. China
| | - Tao Xu
- Frontiers Science Center for Synthetic Biology and Key Laboratory of Systems Bioengineering (Ministry of Education), School of Chemical Engineering and Technology, Tianjin University, Tianjin, 300072 P.R. China
- Synthetic Biology Research Platform, Collaborative Innovation Center of Chemical Science and Engineering (Tianjin), Tianjin University, Tianjin, 300072 P.R. 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, 300072 P.R. China
- Synthetic Biology Research Platform, Collaborative Innovation Center of Chemical Science and Engineering (Tianjin), Tianjin University, Tianjin, 300072 P.R. 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, 300072 P.R. China
- Synthetic Biology Research Platform, Collaborative Innovation Center of Chemical Science and Engineering (Tianjin), Tianjin University, Tianjin, 300072 P.R. China
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Lipid Accumulation by Xylose Metabolism Engineered Mucor circinelloides Strains on Corn Straw Hydrolysate. Appl Biochem Biotechnol 2020; 193:856-868. [PMID: 33200265 DOI: 10.1007/s12010-020-03427-2] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/16/2020] [Accepted: 09/11/2020] [Indexed: 12/27/2022]
Abstract
Previously, we presented a novel approach for increasing the consumption of xylose and the lipid yield by overexpressing the genes coding for xylose isomerase (XI) and xylulokinase (XK) in Mucor circinelloides. In the present study, an in-depth analysis of lipid accumulation by xylose metabolism engineered M. circinelloides strains (namely Mc-XI and Mc-XK) using corn straw hydrolysate was to be explored. The results showed that the fatty acid contents of the engineered M. circinelloides strains were, respectively, increased by 19.8% (in Mc-XI) and 22.3% (in Mc-XK) when compared with the control strain, even though a slightly decreased biomass in these engineered strains was detected. Moreover, the xylose uptake rates of engineered strains in the corn straw hydrolysate were improved significantly by 71.5% (in Mc-XI) and 68.8% (in Mc-XK), respectively, when compared with the control strain. Maybe the increased utilization of xylose led to an increase in lipid synthesis. When the recombinant M. circinelloides strains were cultured in corn straw hydrolysate medium with the carbon-to-nitrogen ratio (C/N ratio) of 50 and initial pH of 6.0, at 30 °C and 500 rpm for 144 h, a total biomass of 12.6-12.9 g/L with a lipid content of 17.2-17.7% (corresponding to a lipid yield of 2.17-2.28 g/L) was achieved. Our study provides a foundation for the further application of the engineered M. circinelloides strains to produce lipid from lignocelluloses.
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Longanesi L, Bouxin FP, Fan J, Auta H, Gammons R, Abeln F, Budarin VL, Clark JH, Chuck CJ. Scaled-Up Microwave-Assisted Pretreatment and Continuous Fermentation to Produce Yeast Lipids from Brewery Wastes. Ind Eng Chem Res 2020. [DOI: 10.1021/acs.iecr.0c03463] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Luca Longanesi
- Department of Chemical Engineering, University of Bath, Bath BA2 7AY, U.K
| | - Florent P. Bouxin
- Green Chemistry Centre of Excellence, Department of Chemistry, University of York, Heslington, York YO10 5DD, U.K
| | - Jiajun Fan
- Green Chemistry Centre of Excellence, Department of Chemistry, University of York, Heslington, York YO10 5DD, U.K
| | - Hadiza Auta
- Department of Chemical Engineering, University of Bath, Bath BA2 7AY, U.K
| | - Richard Gammons
- Green Chemistry Centre of Excellence, Department of Chemistry, University of York, Heslington, York YO10 5DD, U.K
| | - Felix Abeln
- Department of Chemical Engineering, University of Bath, Bath BA2 7AY, U.K
| | - Vitaliy L. Budarin
- Green Chemistry Centre of Excellence, Department of Chemistry, University of York, Heslington, York YO10 5DD, U.K
| | - James H. Clark
- Green Chemistry Centre of Excellence, Department of Chemistry, University of York, Heslington, York YO10 5DD, U.K
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Su Z, Wang F, Xie Y, Xie H, Mao G, Zhang H, Song A, Zhang Z. Reassessment of the role of CaCO 3 in n-butanol production from pretreated lignocellulosic biomass by Clostridium acetobutylicum. Sci Rep 2020; 10:17956. [PMID: 33087773 PMCID: PMC7578090 DOI: 10.1038/s41598-020-74899-9] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/06/2019] [Accepted: 10/05/2020] [Indexed: 12/25/2022] Open
Abstract
In this study, the role of CaCO3 in n-butanol production was further investigated using corn straw hydrolysate (CSH) media by Clostridium acetobutylicum CICC 8016. CaCO3 addition stimulated sugars utilization and butanol production. Further study showed that calcium salts addition to CSH media led to the increase in Ca2+ concentration both intracellularly and extracellularly. Interestingly, without calcium salts addition, intracellular Ca2+ concentration in the synthetic P2 medium was much higher than that in the CSH medium despite the lower extracellular Ca2+ concentrations in the P2 medium. These results indicated that without additional calcium salts, Ca2+ uptake by C. acetobutylicum CICC 8016 in the CSH medium may be inhibited by non-sugar biomass degradation compounds, such as furans, phenolics and organic acids. Comparative proteomics analysis results showed that most enzymes involved in glycolysis, redox balance and amino acids metabolism were up-regulated with CaCO3 addition. This study provides further insights into the role of CaCO3 in n-butanol production using real biomass hydrolysate.
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Affiliation(s)
- Zengping Su
- Key Laboratory of Agricultural Microbial Enzyme Engineering (Ministry of Agriculture), College of Life Science, Henan Agricultural University, No. 63, Nongye Road, Jinshui District, Zhengzhou, 450002, Henan Province, China
| | - Fengqin Wang
- Key Laboratory of Agricultural Microbial Enzyme Engineering (Ministry of Agriculture), College of Life Science, Henan Agricultural University, No. 63, Nongye Road, Jinshui District, Zhengzhou, 450002, Henan Province, China.
| | - Yaohuan Xie
- Key Laboratory of Agricultural Microbial Enzyme Engineering (Ministry of Agriculture), College of Life Science, Henan Agricultural University, No. 63, Nongye Road, Jinshui District, Zhengzhou, 450002, Henan Province, China
| | - Hui Xie
- Key Laboratory of Agricultural Microbial Enzyme Engineering (Ministry of Agriculture), College of Life Science, Henan Agricultural University, No. 63, Nongye Road, Jinshui District, Zhengzhou, 450002, Henan Province, China
| | - Guotao Mao
- Key Laboratory of Agricultural Microbial Enzyme Engineering (Ministry of Agriculture), College of Life Science, Henan Agricultural University, No. 63, Nongye Road, Jinshui District, Zhengzhou, 450002, Henan Province, China
| | - Hongsen Zhang
- Key Laboratory of Agricultural Microbial Enzyme Engineering (Ministry of Agriculture), College of Life Science, Henan Agricultural University, No. 63, Nongye Road, Jinshui District, Zhengzhou, 450002, Henan Province, China
| | - Andong Song
- Key Laboratory of Agricultural Microbial Enzyme Engineering (Ministry of Agriculture), College of Life Science, Henan Agricultural University, No. 63, Nongye Road, Jinshui District, Zhengzhou, 450002, Henan Province, China.
| | - Zhanying Zhang
- Centre for Agriculture and the Bioeconomy, Institute for Future Environments, Queensland University of Technology, Brisbane, QLD, 4000, Australia.,School of Mechanical, Medical and Process Engineering, Science and Engineering Faculty, Queensland University of Technology, Brisbane, QLD, 4000, Australia
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Sharma S, Arora A. Tracking strategic developments for conferring xylose utilization/fermentation by Saccharomyces cerevisiae. ANN MICROBIOL 2020. [DOI: 10.1186/s13213-020-01590-9] [Citation(s) in RCA: 14] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/05/2023] Open
Abstract
Abstract
Purpose
Efficient ethanol production through lignocellulosic biomass hydrolysates could solve energy crisis as it is economically sustainable and ecofriendly. Saccharomyces cerevisiae is the work horse for lignocellulosic bioethanol production at industrial level. But its inability to ferment and utilize xylose limits the overall efficacy of the process.
Method
Data for the review was selected using different sources, such as Biofuels digest, Statista, International energy agency (IEA). Google scholar was used as a search engine to search literature for yeast metabolic engineering approaches. Keywords used were metabolic engineering of yeast for bioethanol production from lignocellulosic biomass.
Result
Through these approaches, interconnected pathways can be targeted randomly. Moreover, the improved strains genetic makeup can help us understand the mechanisms involved for this purpose.
Conclusion
This review discusses all possible approaches for metabolic engineering of yeast. These approaches may reveal unknown hidden mechanisms and construct ways for the researchers to produce novel and modified strains.
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Jilani SB, Dev C, Eqbal D, Jawed K, Prasad R, Yazdani SS. Deletion of pgi gene in E. coli increases tolerance to furfural and 5-hydroxymethyl furfural in media containing glucose-xylose mixture. Microb Cell Fact 2020; 19:153. [PMID: 32723338 PMCID: PMC7389444 DOI: 10.1186/s12934-020-01414-0] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/16/2020] [Accepted: 07/20/2020] [Indexed: 01/18/2023] Open
Abstract
BACKGROUND Furfural and 5-hydroxymethyl furfural (5-HMF) are key furan inhibitors that are generated due to breakdown of lignocellulosic sugars at high temperature and acidic treatment conditions. Both furfural and 5-HMF act in a synergistic manner to inhibit microbial metabolism and resistance to both is a desirable characteristic for efficient conversion of lignocellulosic carbon to ethanol. Genetic manipulations targeted toward increasing cellular NADPH pools have successfully imparted tolerance against furfural and 5-HMF. In present study, deletion of pgi gene as a strategy to augment carbon flow through pentose phosphate pathway (PPP) was studied in ethanologenic Escherichia coli strain SSK101 to impart tolerance towards either furfural or 5-HMFor both inhibitors together. RESULTS A key gene of EMP pathway, pgi, was deleted in an ethanologenic E. coli strain SSK42 to yield strain SSK101. In presence of 1 g/L furfural in minimal AM1 media, the rate of biomass formation for strain SSK101 was up to 1.9-fold higher as compared to parent SSK42 strain, and it was able to clear furfural in half the time. Tolerance to inhibitor was associated with glucose as carbon source and not xylose, and the tolerance advantage of SSK101 was neutralized in LB media. Bioreactor studies were performed under binary stress of furfural and 5-HMF (1 g/L each) and different glucose concentrations in a glucose-xylose mixture with final sugar concentration of 5.5%, mimicking major components of dilute acid treated biomass hydrolysate. In the mixture having 6 g/L and 12 g/L glucose, SSK101 strain produced ~ 18 g/L and 20 g/L ethanol, respectively. Interestingly, the maximum ethanol productivity was better at lower glucose load with 0.46 g/(L.h) between 96 and 120 h, as compared to higher glucose load where it was 0.33 g/(L.h) between 144 and 168 h. Importantly, parent strain SSK42 did not exhibit significant metabolic activity under similar conditions of inhibitor load and sugar concentration. CONCLUSIONS E. coli strain SSK101 with pgi deletion had enhanced tolerance against both furfural and 5-HMF, which was associated with presence of glucose in media. Strain SSK101 also had improved fermentation characteristics under both hyperosmotic as well as binary stress of furfural and 5-HMF in media containing glucose-xylose mixture.
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Affiliation(s)
- Syed Bilal Jilani
- Microbial Engineering Group, International Centre for Genetic Engineering and Biotechnology (ICGEB), Aruna Asaf Ali Marg, New Delhi, India
- DBT-ICGEB Centre for Advanced Bioenergy Research, International Centre for Genetic Engineering and Biotechnology, New Delhi, India
- Institute of Biotechnology, Amity University, Manesar, Haryana India
| | - Chandra Dev
- Microbial Engineering Group, International Centre for Genetic Engineering and Biotechnology (ICGEB), Aruna Asaf Ali Marg, New Delhi, India
- DBT-ICGEB Centre for Advanced Bioenergy Research, International Centre for Genetic Engineering and Biotechnology, New Delhi, India
| | - Danish Eqbal
- Microbial Engineering Group, International Centre for Genetic Engineering and Biotechnology (ICGEB), Aruna Asaf Ali Marg, New Delhi, India
- DBT-ICGEB Centre for Advanced Bioenergy Research, International Centre for Genetic Engineering and Biotechnology, New Delhi, India
| | - Kamran Jawed
- Microbial Engineering Group, International Centre for Genetic Engineering and Biotechnology (ICGEB), Aruna Asaf Ali Marg, New Delhi, India
- DBT-ICGEB Centre for Advanced Bioenergy Research, International Centre for Genetic Engineering and Biotechnology, New Delhi, India
- Present Address: Biodiscovery Institute, School of Life Sciences, University of Nottingham, Nottingham, UK
| | - Rajendra Prasad
- Institute of Biotechnology, Amity University, Manesar, Haryana India
| | - Syed Shams Yazdani
- Microbial Engineering Group, International Centre for Genetic Engineering and Biotechnology (ICGEB), Aruna Asaf Ali Marg, New Delhi, India
- DBT-ICGEB Centre for Advanced Bioenergy Research, International Centre for Genetic Engineering and Biotechnology, New Delhi, India
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Stojiljkovic M, Foulquié-Moreno MR, Thevelein JM. Polygenic analysis of very high acetic acid tolerance in the yeast Saccharomyces cerevisiae reveals a complex genetic background and several new causative alleles. BIOTECHNOLOGY FOR BIOFUELS 2020; 13:126. [PMID: 32695222 PMCID: PMC7364526 DOI: 10.1186/s13068-020-01761-5] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 03/13/2020] [Accepted: 07/04/2020] [Indexed: 06/11/2023]
Abstract
BACKGROUND High acetic acid tolerance is of major importance in industrial yeast strains used for second-generation bioethanol production, because of the high acetic acid content of lignocellulose hydrolysates. It is also important in first-generation starch hydrolysates and in sourdoughs containing significant acetic acid levels. We have previously identified snf4 E269* as a causative allele in strain MS164 obtained after whole-genome (WG) transformation and selection for improved acetic acid tolerance. RESULTS We have now performed polygenic analysis with the same WG transformant MS164 to identify novel causative alleles interacting with snf4 E269* to further enhance acetic acid tolerance, from a range of 0.8-1.2% acetic acid at pH 4.7, to previously unmatched levels for Saccharomyces cerevisiae. For that purpose, we crossed the WG transformant with strain 16D, a previously identified strain displaying very high acetic acid tolerance. Quantitative trait locus (QTL) mapping with pooled-segregant whole-genome sequence analysis identified four major and two minor QTLs. In addition to confirmation of snf4 E269* in QTL1, we identified six other genes linked to very high acetic acid tolerance, TRT2, MET4, IRA2 and RTG1 and a combination of MSH2 and HAL9, some of which have never been connected previously to acetic acid tolerance. Several of these genes appear to be wild-type alleles that complement defective alleles present in the other parent strain. CONCLUSIONS The presence of several novel causative genes highlights the distinct genetic basis and the strong genetic background dependency of very high acetic acid tolerance. Our results suggest that elimination of inferior mutant alleles might be equally important for reaching very high acetic acid tolerance as introduction of rare superior alleles. The superior alleles of MET4 and RTG1 might be useful for further improvement of acetic acid tolerance in specific industrial yeast strains.
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Affiliation(s)
- Marija Stojiljkovic
- Laboratory of Molecular Cell Biology, Institute of Botany and Microbiology, Department of Biology, KU Leuven, Kasteelpark Arenberg 31, 3001 Leuven-Heverlee, Flanders Belgium
- Center for Microbiology, VIB, Kasteelpark Arenberg 31, 3001 Leuven-Heverlee, Flanders Belgium
| | - María R. Foulquié-Moreno
- Laboratory of Molecular Cell Biology, Institute of Botany and Microbiology, Department of Biology, KU Leuven, Kasteelpark Arenberg 31, 3001 Leuven-Heverlee, Flanders Belgium
- Center for Microbiology, VIB, Kasteelpark Arenberg 31, 3001 Leuven-Heverlee, Flanders Belgium
| | - Johan M. Thevelein
- Laboratory of Molecular Cell Biology, Institute of Botany and Microbiology, Department of Biology, KU Leuven, Kasteelpark Arenberg 31, 3001 Leuven-Heverlee, Flanders Belgium
- Center for Microbiology, VIB, Kasteelpark Arenberg 31, 3001 Leuven-Heverlee, Flanders Belgium
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Pretreatment and Detoxification of Acid-Treated Wood Hydrolysates for Pyruvate Production by an Engineered Consortium of Escherichia coli. Appl Biochem Biotechnol 2020; 192:243-256. [PMID: 32372381 DOI: 10.1007/s12010-020-03320-y] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/18/2020] [Accepted: 04/23/2020] [Indexed: 10/24/2022]
Abstract
The biorefinery concept makes use of renewable lignocellulosic biomass to produce commodities sustainably. A synthetic microbial consortium can enable the simultaneous utilization of sugars such as glucose and xylose to produce biochemicals, where each consortium member converts one sugar into the target product. In this study, woody biomass was used to generate glucose and xylose after pretreatment with 20% (w/v) sulfuric acid and 60-min reaction time. We compared several strategies for detoxification with charcoal and sodium borohydride treatments to improve the fermentability of this hydrolysate in a defined medium for the production of the growth-associated product pyruvate. In shake flask culture, the highest pyruvate yield on xylose of 0.8 g/g was found using pH 6 charcoal-treated hydrolysate. In bioreactor studies, a consortium of two engineered E. coli strains converted the mixture of glucose and xylose in batch studies to 12.8 ± 2.7 g/L pyruvate in 13 h. These results demonstrate that lignocellulosic biomass as the sole carbon source can be used to produce growth-related products after employing suitable detoxification strategies.
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20
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Shah SSM, Luthfi AAI, Jahim JM, Harun S, Low KO. An improvement in fermentability of acid-hydrolysed hemicellulose from kenaf stem for xylitol production. INTERNATIONAL JOURNAL OF FOOD ENGINEERING 2020. [DOI: 10.1515/ijfe-2019-0230] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
Abstract
AbstractIn recent years, there has been a growing interest in the use of agricultural biomass for fermentation purposes; however, efficient strategies to counter lignocellulose inhibition are warranted to enhance xylitol production performance. Dilute-acid hydrolysis has been studied to selectively release a significant portion of xylose from hemicellulose, while leaving cellulose and lignin intact. The formation of inhibitory compounds, however, could jeopardise the overall performance during fermentation to produce xylitol. In this study, the fermentability of nitric acid-hydrolysed kenaf stem was substantially improved, through either adaptive evolution of the recombinant Escherichia coli BL21 (DE3) or removal of fermentation inhibitors by detoxification with activated carbon. Both methods were compared to evaluate the superiority in fermentative performance. In the fermentation with detoxified hemicellulosic hydrolysate, the non-adapted strain produced the highest xylitol concentration of up to 6.8 g/L, with 61.5% xylose consumption. The yields of xylitol production involving detoxification were successfully enhanced by 22.6% and by 35.7% compared to those involving adaptive evolution and raw hydrolysate, respectively. The results reported herein suggest that the utilization of detoxified kenaf stem hydrolysate could be advantageous.
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Affiliation(s)
- Siti Syazwani Mohd Shah
- Research Centre of Sustainable Process Technology (CESPRO), Faculty of Engineering and Built Environment, Universiti Kebangsaan, Bangi, Malaysia
| | - Abdullah Amru Indera Luthfi
- Research Centre of Sustainable Process Technology (CESPRO), Faculty of Engineering and Built Environment, Universiti Kebangsaan, Bangi, Malaysia
| | - Jamaliah Md Jahim
- Department of Chemical and Process Engineering, Faculty of Engineering and Built Environment, Universiti Kebangsaan, Bangi, Malaysia
| | - Shuhaida Harun
- Department of Chemical and Process Engineering, Faculty of Engineering and Built Environment, Universiti Kebangsaan, Bangi, Malaysia
| | - Kheng Oon Low
- Malaysia Genome Institute, National Insitutes of Biotechnology Malaysia, Jalan Bangi Lama, Kajang, Malaysia
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Phuengjayaem S, Tanasupawat S, Teeradakorn S. Characterization of a novel Clostridium sp. SP17–B1 and its application for succinic acid production from hevea wood waste hydrolysate. Anaerobe 2020; 61:102096. [DOI: 10.1016/j.anaerobe.2019.102096] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/16/2019] [Revised: 08/19/2019] [Accepted: 09/02/2019] [Indexed: 10/26/2022]
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Cao W, Cao W, Shen F, Luo J, Yin J, Qiao C, Wan Y. Membrane-assisted β-poly(L-malic acid) production from bagasse hydrolysates by Aureobasidium pullulans ipe-1. BIORESOURCE TECHNOLOGY 2020; 295:122260. [PMID: 31654946 DOI: 10.1016/j.biortech.2019.122260] [Citation(s) in RCA: 20] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/09/2019] [Revised: 10/09/2019] [Accepted: 10/10/2019] [Indexed: 06/10/2023]
Abstract
Membrane-assisted β-poly(L-malic acid) (PMLA) production from bagasse hydrolysates was developed. For the first time, it was found that mixing the acid and enzyme hydrolysates was unfavorable for PMLA production because too high hexose: pentose ratio and glucose concentration in the mixed sugar could inhibit the assimilation of pentose. 120 g/L sugar concentrations in the acid hydrolysate was suitable for PMLA production with 23.2 g/L PMLA and 34.7 g/L biomass. Moreover, an integrated membrane process consisting of ultrafiltration, nanofiltration and reverse osmosis membranes could concentrate sugars and adjust acetic acid concentration prior to fermentation of lignocellulosic sugars. Meanwhile, it was found that 1.46 g/L acetic acid was preferred for PMLA production from enzyme hydrolysate or sole glucose which respectively increased PMLA production and cell growth by 25.4% and 5.9% from sole glucose, while it showed no significant enhancement in PMLA production with a higher cell growth and productivity from acid hydrolysate.
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Affiliation(s)
- Weifeng Cao
- State Key Laboratory of Biochemical Engineering, Institute of Process Engineering, Chinese Academy of Sciences, Beijing 100190, China
| | - Weilei Cao
- State Key Laboratory of Biochemical Engineering, Institute of Process Engineering, Chinese Academy of Sciences, Beijing 100190, China; University of the Chinese Academy of Sciences, Chinese Academy of Sciences, Beijing 100049, China
| | - Fei Shen
- State Key Laboratory of Biochemical Engineering, Institute of Process Engineering, Chinese Academy of Sciences, Beijing 100190, China
| | - Jianquan Luo
- State Key Laboratory of Biochemical Engineering, Institute of Process Engineering, Chinese Academy of Sciences, Beijing 100190, China; University of the Chinese Academy of Sciences, Chinese Academy of Sciences, Beijing 100049, China
| | - Junxiang Yin
- China National Center for Biotechnology Development, Beijing 100036, China
| | - Changsheng Qiao
- College of Bioengineering, Tianjin University of Science and Technology, Tianjin 300457, China
| | - Yinhua Wan
- State Key Laboratory of Biochemical Engineering, Institute of Process Engineering, Chinese Academy of Sciences, Beijing 100190, China; University of the Chinese Academy of Sciences, Chinese Academy of Sciences, Beijing 100049, China.
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Tequila Agave Bagasse Hydrolysate for the Production of Polyhydroxybutyrate by Burkholderia sacchari. Bioengineering (Basel) 2019; 6:bioengineering6040115. [PMID: 31861111 PMCID: PMC6956387 DOI: 10.3390/bioengineering6040115] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/25/2019] [Revised: 12/04/2019] [Accepted: 12/07/2019] [Indexed: 12/15/2022] Open
Abstract
Tequila agave bagasse (TAB) is the fibrous waste from the Tequila production process. It is generated in large amounts and its disposal is an environmental problem. Its use as a source of fermentable sugars for biotechnological processes is of interest; thus, it was investigated for the production of polyhydroxybutyrate (PHB) by the xylose-assimilating bacteria Burkholderia sacchari. First, it was chemically hydrolyzed, yielding 20.6 g·L−1 of reducing sugars, with xylose and glucose as the main components (7:3 ratio). Next, the effect of hydrolysis by-products on B. sacchari growth was evaluated. Phenolic compounds showed the highest toxicity (> 60% of growth inhibition). Then, detoxification methods (resins, activated charcoal, laccases) were tested to remove the growth inhibitory compounds from the TAB hydrolysate (TABH). The highest removal percentage (92%) was achieved using activated charcoal (50 g·L−1, pH 2, 4 h). Finally, detoxified TABH was used as the carbon source for the production of PHB in a two-step batch culture, reaching a biomass production of 11.3 g·L−1 and a PHB accumulation of 24 g PHB g−1 dry cell (after 122 h of culture). The polymer structure resulted in a homopolymer of 3-hydroxybutyric acid. It is concluded that the TAB could be hydrolyzed and valorized as a carbon source for producing PHB.
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Characterization of the Furfural and 5-Hydroxymethylfurfural (HMF) Metabolic Pathway in the Novel Isolate Pseudomonas putida ALS1267. Appl Biochem Biotechnol 2019; 190:918-930. [PMID: 31605303 DOI: 10.1007/s12010-019-03130-x] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/22/2019] [Accepted: 08/25/2019] [Indexed: 10/25/2022]
Abstract
The genes involved in the aerobic bacterial metabolism of furfural and 5-hydroxymethylfurfural (HMF) have been characterized in two species, Pseudomonas putida Fu1 and Cupriavidus basilensis HMF14. A third furan-metabolizing strain, Pseudomonas putida ALS1267, was recently identified that grows robustly on both furfural and HMF as sole carbon sources, with a growth rate of 0.250 h-1 on furfural and 0.311 h-1 on HMF, and we have characterized the genes involved in furfural and HMF metabolism in this bacterium. Unlike C. basilensis HMF14, which contains separate furfural and HMF operons, P. putida ALS1267 contains one contiguous 18.1-kb operon, which harbors all of the furfural- and HMF-metabolizing genes except for one, the hmfH gene that encodes HMF/furfural oxidoreductase and has both HMF acid oxidase and furfural/HMF dehydrogenase activity. The 18.1-kb operon was cloned into P. putida KT2440, which cannot metabolize furans, enabling growth on furfural as the sole carbon source with a growth rate of 0.340 h-1. The clone did not allow P. putida KT2440 to metabolize HMF, most likely due to the lack of the hmfH gene. No hmfH homolog was identified in P. putida ALS1267, suggesting that another gene in the ALS1267 genome provides this function.
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Sarawan C, Suinyuy TN, Sewsynker-Sukai Y, Gueguim Kana EB. Optimized activated charcoal detoxification of acid-pretreated lignocellulosic substrate and assessment for bioethanol production. BIORESOURCE TECHNOLOGY 2019; 286:121403. [PMID: 31078980 DOI: 10.1016/j.biortech.2019.121403] [Citation(s) in RCA: 21] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/06/2019] [Revised: 04/28/2019] [Accepted: 04/29/2019] [Indexed: 06/09/2023]
Abstract
This study optimized an activated charcoal (AC) detoxification method for the reduction of three different fermentation inhibitor compounds, while minimising the reducing sugar loss from acid-pretreated sorghum leaf (SL) wastes. Process optimization demonstrated a 98%, 88% and 37% removal efficiency for furfural, 5-hydroxymethylfurfural (HMF) and acetic acid respectively, with a 7% reducing sugar loss. Subsequently, the logistic and modified Gompertz models were used to comparatively evaluate the kinetics of Saccharomyces cerevisiae growth and ethanol production using the non-detoxified (NDF) and optimized detoxified (ODF) substrate. Yeast cell growth and bioethanol kinetic coefficients revealed that the ODF process was more effective than the NDF system. The experimental data generated from this study revealed that a suitable, cost-effective AC detoxification enhanced cell growth and bioethanol production efficiency. These findings pave the way for biomass pretreatment, detoxification and bioethanol process development using lignocellulosic wastes.
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Affiliation(s)
- Caitlyn Sarawan
- University of KwaZulu-Natal, School of Life Sciences, Pietermaritzburg, South Africa
| | - T N Suinyuy
- University of KwaZulu-Natal, School of Life Sciences, Pietermaritzburg, South Africa
| | - Y Sewsynker-Sukai
- University of KwaZulu-Natal, School of Life Sciences, Pietermaritzburg, South Africa
| | - E B Gueguim Kana
- University of KwaZulu-Natal, School of Life Sciences, Pietermaritzburg, South Africa.
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Singh N, Choudhury B. Valorization of food-waste hydrolysate by Lentibacillus salarius NS12IITR for the production of branched chain fatty acid enriched lipid with potential application as a feedstock for improved biodiesel. WASTE MANAGEMENT (NEW YORK, N.Y.) 2019; 94:1-9. [PMID: 31279385 DOI: 10.1016/j.wasman.2019.05.033] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/16/2018] [Revised: 04/26/2019] [Accepted: 05/20/2019] [Indexed: 06/09/2023]
Abstract
Oxidation stability and cold flow properties of biodiesel can be improved by using lipid with enriched branched-chain fatty acid (BCFA) as a feedstock. A halophilic bacterium was utilized for the production of BCFA enriched lipid from acid hydrolysate of food-waste. The maximum reducing sugar obtained by hydrolysis of wheat bran, rice bran, mango peel, and orange peel were 64.52 ± 0.57, 38.7 ± 0.58, 55.64 ± 1.14, 36.29 ± 0.54 g/L, respectively. On assessing these hydrolysates as feedstock for growth of halophilic bacterium Lentibacillus salarius NS12IITR at 10 g/L reducing sugar concentration, wheat bran hydrolysate was found to be best in-terms of sugar consumption (92%), lipid production (0.70 ± 0.029 g/L) and maximum branched-chain fatty acid methyl ester (FAME) (81 ± 4.72% of total FAME). At 20 g/L of reducing sugar concentration of wheat bran hydrolysate, the biomass and lipid yields were almost doubled. Efficient lipid extraction from cell, involving thermolysis at 85 °C and pH 2 along with osmotic shock resulted in isolation of 69% of total lipid.
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Affiliation(s)
- Noopur Singh
- Department of Biotechnology, Indian Institute of Technology Roorkee, Roorkee, Uttarakhand 247667, India
| | - Bijan Choudhury
- Department of Biotechnology, Indian Institute of Technology Roorkee, Roorkee, Uttarakhand 247667, India.
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Production of cellulosic butyrate and 3-hydroxybutyrate in engineered Escherichia coli. Appl Microbiol Biotechnol 2019; 103:5215-5230. [DOI: 10.1007/s00253-019-09815-x] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/07/2018] [Revised: 03/20/2019] [Accepted: 03/31/2019] [Indexed: 01/17/2023]
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Singh A, Bedore SR, Sharma NK, Lee SA, Eiteman MA, Neidle EL. Removal of aromatic inhibitors produced from lignocellulosic hydrolysates by Acinetobacter baylyi ADP1 with formation of ethanol by Kluyveromyces marxianus. BIOTECHNOLOGY FOR BIOFUELS 2019; 12:91. [PMID: 31044004 PMCID: PMC6477725 DOI: 10.1186/s13068-019-1434-7] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/13/2019] [Accepted: 04/12/2019] [Indexed: 05/15/2023]
Abstract
BACKGROUND Lignocellulosic biomass is an attractive, inexpensive source of potentially fermentable sugars. However, hydrolysis of lignocellulose results in a complex mixture containing microbial inhibitors at variable composition. A single microbial species is unable to detoxify or even tolerate these non-sugar components while converting the sugar mixtures effectively to a product of interest. Often multiple substrates are metabolized sequentially because of microbial regulatory mechanisms. To overcome these problems, we engineered strains of Acinetobacter baylyi ADP1 to comprise a consortium able to degrade benzoate and 4-hydroxybenzoate simultaneously under batch and continuous conditions in the presence of sugars. We furthermore used a thermotolerant yeast, Kluyveromyces marxianus, to convert the glucose remaining after detoxification to ethanol. RESULTS The two engineered strains, one unable to metabolize benzoate and another unable to metabolize 4-hydroxybenzoate, when grown together removed these two inhibitors simultaneously under batch conditions. Under continuous conditions, a single strain with a deletion in the gcd gene metabolized both inhibitors in the presence of sugars. After this batch detoxification using ADP1-derived mutants, K. marxianus generated 36.6 g/L ethanol. CONCLUSIONS We demonstrated approaches for the simultaneous removal of two aromatic inhibitors from a simulated lignocellulosic hydrolysate. A two-stage batch process converted the residual sugar into a non-growth-associated product, ethanol. Such a two-stage process with bacteria (A. baylyi) and yeast (K. marxianus) is advantageous, because the yeast fermentation occurs at a higher temperature which prevents growth and ethanol consumption of A. baylyi. Conceptually, the process can be extended to other inhibitors or sugars found in real hydrolysates. That is, additional strains which degrade components of lignocellulosic hydrolysates could be made substrate-selective and targeted for use with specific complex mixtures found in a hydrolysate.
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Affiliation(s)
- Anita Singh
- Department of Environmental Sciences, Central University of Jammu, Rahya-Suchani, Bagla, India
- School of Chemical, Materials and Biomedical Engineering, University of Georgia, Athens, GA 30602 USA
| | - Stacy R. Bedore
- Department of Microbiology, University of Georgia, Athens, GA 30602 USA
| | - Nilesh K. Sharma
- School of Chemical, Materials and Biomedical Engineering, University of Georgia, Athens, GA 30602 USA
| | - Sarah A. Lee
- School of Chemical, Materials and Biomedical Engineering, University of Georgia, Athens, GA 30602 USA
| | - Mark A. Eiteman
- Department of Environmental Sciences, Central University of Jammu, Rahya-Suchani, Bagla, India
- School of Chemical, Materials and Biomedical Engineering, University of Georgia, Athens, GA 30602 USA
| | - Ellen L. Neidle
- Department of Microbiology, University of Georgia, Athens, GA 30602 USA
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Mohammadi S, Piri K, Dinarvand M. Antioxidant and Antibacterial Effects of Some Medicinal Plants of Iran. INTERNATIONAL JOURNAL OF SECONDARY METABOLITE 2019. [DOI: 10.21448/ijsm.514968] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/04/2022] Open
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Development of Robust Yeast Strains for Lignocellulosic Biorefineries Based on Genome-Wide Studies. PROGRESS IN MOLECULAR AND SUBCELLULAR BIOLOGY 2019; 58:61-83. [PMID: 30911889 DOI: 10.1007/978-3-030-13035-0_3] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Abstract
Lignocellulosic biomass has been widely studied as the renewable feedstock for the production of biofuels and biochemicals. Budding yeast Saccharomyces cerevisiae is commonly used as a cell factory for bioconversion of lignocellulosic biomass. However, economic bioproduction using fermentable sugars released from lignocellulosic feedstocks is still challenging. Due to impaired cell viability and fermentation performance by various inhibitors that are present in the cellulosic hydrolysates, robust yeast strains resistant to various stress environments are highly desired. Here, we summarize recent progress on yeast strain development for the production of biofuels and biochemical using lignocellulosic biomass. Genome-wide studies which have contributed to the elucidation of mechanisms of yeast stress tolerance are reviewed. Key gene targets recently identified based on multiomics analysis such as transcriptomic, proteomic, and metabolomics studies are summarized. Physiological genomic studies based on zinc sulfate supplementation are highlighted, and novel zinc-responsive genes involved in yeast stress tolerance are focused. The dependence of host genetic background of yeast stress tolerance and roles of histones and their modifications are emphasized. The development of robust yeast strains based on multiomics analysis benefits economic bioconversion of lignocellulosic biomass.
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Liao Z, Guo X, Hu J, Suo Y, Fu H, Wang J. The significance of proline on lignocellulose-derived inhibitors tolerance in Clostridium acetobutylicum ATCC 824. BIORESOURCE TECHNOLOGY 2019; 272:561-569. [PMID: 30396113 DOI: 10.1016/j.biortech.2018.10.038] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/11/2018] [Revised: 10/15/2018] [Accepted: 10/16/2018] [Indexed: 06/08/2023]
Abstract
When lignocellulosic biomass was used for acetone-butanol-ethanol (ABE) fermentation, several lignocellulose-derived inhibitors, which are toxic to Clostridium acetobutylicum, were generated during acid hydrolysis process and seriously hindered the industrialization of lignocellulosic butanol. In this study, an engineered strain 824(proABC) with significantly improved tolerance to multiple lignocellulose-derived inhibitors (formic acid and phenolic compounds) was constructed by strengthening the proline biosynthesis. The engineered strain exhibited more effective synthesis ability of proline and scavenging ability of reactive oxygen species (ROS). Consequently, the butanol produced by 824(proABC) was 1-, 2.4- or 3.4-fold higher than that of the wild type strain when using the undetoxified hydrolysate of soybean straw, rice straw or corn straw as the substrate, respectively. Therefore, enhancing the proline biosynthesis can be used as an effective strategy to improve the tolerance of C. acetobutylicum to multiple lignocellulose-derived inhibitors, and 824(proABC) has great potential to produce butanol from undetoxified lignocellulosic hydrolysates.
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Affiliation(s)
- Zhengping Liao
- School of Biology and Biological Engineering, South China University of Technology, Guangzhou 510006, China
| | - Xiaolong Guo
- School of Biology and Biological Engineering, South China University of Technology, Guangzhou 510006, China
| | - Jialei Hu
- School of Biology and Biological Engineering, South China University of Technology, Guangzhou 510006, China
| | - Yukai Suo
- School of Biology and Biological Engineering, South China University of Technology, Guangzhou 510006, China
| | - Hongxin Fu
- School of Biology and Biological Engineering, South China University of Technology, Guangzhou 510006, China.
| | - Jufang Wang
- School of Biology and Biological Engineering, South China University of Technology, Guangzhou 510006, China; State Key Laboratory of Pulp and Paper Engineering, South China University of Technology, Guangzhou 510640, China.
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Martínez-Ruano JA, Caballero-Galván AS, Restrepo-Serna DL, Cardona CA. Techno-economic and environmental assessment of biogas production from banana peel (Musa paradisiaca) in a biorefinery concept. ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH INTERNATIONAL 2018; 25:35971-35980. [PMID: 29626328 DOI: 10.1007/s11356-018-1848-y] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/08/2017] [Accepted: 03/20/2018] [Indexed: 06/08/2023]
Abstract
Two scenarios for the biogas production using Banana Peel as raw material were evaluated. The first scenario involves the stand-alone production of biogas and the second scenario includes the biogas production together with other products under biorefinery concept. In both scenarios, the influence of the production scale on the process economy was assessed and feasibility limits were defined. For this purpose, the mass and energy balances were established using the software Aspen Plus along with kinetic models reported in the literature. The economic and environmental analysis of the process was performed considering Colombian economic conditions. As a result, it was found that different process scales showed great potential for biogas production. Thus, plants with greater capacity have a greater economic benefit than those with lower capacity. However, this benefit leads to high-energy consumption and greater environmental impact.
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Affiliation(s)
- Jimmy Anderson Martínez-Ruano
- Instituto de Biotecnología y Agroindustria, Laboratorio de Equilibrios Químicos y Cinética Enzimática, Departamento de Ingeniería Química, Universidad Nacional de Colombia sede Manizales, Manizales, Colombia
| | - Ashley Sthefanía Caballero-Galván
- Instituto de Biotecnología y Agroindustria, Laboratorio de Equilibrios Químicos y Cinética Enzimática, Departamento de Ingeniería Química, Universidad Nacional de Colombia sede Manizales, Manizales, Colombia
| | - Daissy Lorena Restrepo-Serna
- Instituto de Biotecnología y Agroindustria, Laboratorio de Equilibrios Químicos y Cinética Enzimática, Departamento de Ingeniería Química, Universidad Nacional de Colombia sede Manizales, Manizales, Colombia
| | - Carlos Ariel Cardona
- Instituto de Biotecnología y Agroindustria, Laboratorio de Equilibrios Químicos y Cinética Enzimática, Departamento de Ingeniería Química, Universidad Nacional de Colombia sede Manizales, Manizales, Colombia.
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Ibrahim MF, Kim SW, Abd-Aziz S. Advanced bioprocessing strategies for biobutanol production from biomass. RENEWABLE AND SUSTAINABLE ENERGY REVIEWS 2018; 91:1192-1204. [DOI: 10.1016/j.rser.2018.04.060] [Citation(s) in RCA: 26] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 09/02/2023]
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Zhang Y, Xia C, Lu M, Tu M. Effect of overliming and activated carbon detoxification on inhibitors removal and butanol fermentation of poplar prehydrolysates. BIOTECHNOLOGY FOR BIOFUELS 2018; 11:178. [PMID: 29983741 PMCID: PMC6020205 DOI: 10.1186/s13068-018-1182-0] [Citation(s) in RCA: 28] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/05/2018] [Accepted: 06/20/2018] [Indexed: 05/26/2023]
Abstract
BACKGROUND Biomass prehydrolysates from dilute acid pretreatment contain a considerable amount of fermentable sugars for biofuels production. However, carbonyl degradation compounds present severe toxicity to fermentation microbes. Furans (such as furfural and hydroxymethylfurfural), aliphatic acids (such as acetic acid, formic acid and levulinic acid) and phenolic compounds (such as vanillin and syringaldehyde) have been suggested to be the main inhibitors in biomass prehydrolysates. However, no single compound has been determined as the dominant toxic inhibitor. The effects of various detoxification methods on inhibitors removal have not been fully understood. RESULTS The effects of overliming and activated carbon (AC) detoxification on the removal of inhibitors and butanol fermentation of the poplar prehydrolysates were investigated. Gas chromatography-mass spectrometry (GC/MS) was used to identify and quantify 46 carbonyl compounds as potential inhibitors. It was observed that overliming and AC treatment alone did not make the prehydrolysates fermentable with Clostridium saccharobutylicum. The sequential overliming and AC resulted in a remarkable fermentability and a high butanol yield at 0.22 g g-1 sugar. The inhibitor removal in the prehydrolysates treated by overliming and AC was also examined by GC/MS. Overliming removed 75.6% of furan derivatives and 68.1% of aromatic monomers. In comparison, AC (5.0% w/v) removed 77.9% of furan derivatives and 98.6% of aromatic monomers. In addition, overliming removed much more 2,5-furandicarboxyaldehyde, 5-ethylfuran-2-carbaldehyde and 2,5-hexanedione than AC did. On the contrary, AC could remove considerably more phenolic acids than overliming. In the sequential detoxification, both dialdehydes/diketones and phenolic acids were extensively removed. This could be the main reason why the sequential detoxification enabled a remarkable ABE fermentation for the prehydrolysates. CONCLUSIONS This study indicated that the effect of overliming and AC treatment on inhibitors removal was related to their chemical structures. Overliming removed more dialdehydes and diketones than AC treatment, while AC removed more phenolic acids than overliming. Sequential overliming and AC treatment were required to make the prehydrolysates fermentable with C. saccharobutylicum. The study also suggested different detoxification method was needed for ABE fermentation of the prehydrolysate as compared to ethanol fermentation.
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Affiliation(s)
- Yu Zhang
- Department of Chemical and Environmental Engineering, University of Cincinnati, 2901 Woodside Drive, Cincinnati, OH 45221 USA
| | - Changlei Xia
- Department of Chemical and Environmental Engineering, University of Cincinnati, 2901 Woodside Drive, Cincinnati, OH 45221 USA
| | - Mingming Lu
- Department of Chemical and Environmental Engineering, University of Cincinnati, 2901 Woodside Drive, Cincinnati, OH 45221 USA
| | - Maobing Tu
- Department of Chemical and Environmental Engineering, University of Cincinnati, 2901 Woodside Drive, Cincinnati, OH 45221 USA
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García CA, Peña Á, Betancourt R, Cardona CA. Energetic and environmental assessment of thermochemical and biochemical ways for producing energy from agricultural solid residues: Coffee Cut-Stems case. JOURNAL OF ENVIRONMENTAL MANAGEMENT 2018; 216:160-168. [PMID: 28449949 DOI: 10.1016/j.jenvman.2017.04.029] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/23/2017] [Revised: 04/08/2017] [Accepted: 04/10/2017] [Indexed: 05/02/2023]
Abstract
Forest residues are an important source of biomass. Among these, Coffee Cut-Stems (CCS) are an abundant wood waste in Colombia obtained from coffee crops renovation. However, only low quantities of these residues are used directly in combustion processes for heating and cooking in coffee farms where their energy efficiency is very low. In the present work, an energy and environmental assessment of two bioenergy production processes (ethanol fermentation and gasification) using CCS as raw material was performed. Biomass gasification seems to be the most promising thermochemical method for bioenergy production whereas, ethanol fermentation is a widely studied biochemical method to produce biofuels. Experimental runs of the CCS gasification were carried out and the synthesis gas composition was monitored. Prior to the fermentation process, a treatment of the CCS is required from which sugar content was determined and then, in the fermentation process, the ethanol yield was calculated. Both processes were simulated in order to obtain the mass and energy balance that are used to assess the energy efficiency and the potential environmental impact (PEI). Moderate high energy efficiency and low environmental impacts were obtained from the CCS gasification. In contrast, high environmental impacts in different categories and low energy efficiencies were calculated from the ethanolic fermentation. Biomass gasification seems to be the most promising technology for the use of Coffee Cut-Stems with high energy yields and low environmental issues.
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Affiliation(s)
- Carlos A García
- Instituto de Biotecnología y Agroindustria, Departamento de Ingeniería Química, Universidad Nacional de Colombia Sede Manizales, Cra. 27 No. 64-60, Manizales, Colombia
| | - Álvaro Peña
- Instituto de Biotecnología y Agroindustria, Departamento de Ingeniería Química, Universidad Nacional de Colombia Sede Manizales, Cra. 27 No. 64-60, Manizales, Colombia
| | - Ramiro Betancourt
- Instituto de Biotecnología y Agroindustria, Departamento de Ingeniería Química, Universidad Nacional de Colombia Sede Manizales, Cra. 27 No. 64-60, Manizales, Colombia
| | - Carlos A Cardona
- Instituto de Biotecnología y Agroindustria, Departamento de Ingeniería Química, Universidad Nacional de Colombia Sede Manizales, Cra. 27 No. 64-60, Manizales, Colombia.
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Detoxification and concentration of corn stover hydrolysate and its fermentation for ethanol production. Front Chem Sci Eng 2018. [DOI: 10.1007/s11705-018-1714-y] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/16/2022]
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Pan S, Jia B, Liu H, Wang Z, Chai MZ, Ding MZ, Zhou X, Li X, Li C, Li BZ, Yuan YJ. Endogenous lycopene improves ethanol production under acetic acid stress in Saccharomyces cerevisiae. BIOTECHNOLOGY FOR BIOFUELS 2018; 11:107. [PMID: 29643937 PMCID: PMC5891932 DOI: 10.1186/s13068-018-1107-y] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/07/2018] [Accepted: 04/04/2018] [Indexed: 06/01/2023]
Abstract
BACKGROUND Acetic acid, generated from the pretreatment of lignocellulosic biomass, is a significant obstacle for lignocellulosic ethanol production. Reactive oxidative species (ROS)-mediated cell damage is one of important issues caused by acetic acid. It has been reported that decreasing ROS level can improve the acetic acid tolerance of Saccharomyces cerevisiae. RESULTS Lycopene is known as an antioxidant. In the study, we investigated effects of endogenous lycopene on cell growth and ethanol production of S. cerevisiae in acetic acid media. By accumulating endogenous lycopene during the aerobic fermentation of the seed stage, the intracellular ROS level of strain decreased to 1.4% of that of the control strain during ethanol fermentation. In the ethanol fermentation system containing 100 g/L glucose and 5.5 g/L acetic acid, the lag phase of strain was 24 h shorter than that of control strain. Glucose consumption rate and ethanol titer of yPS002 got to 2.08 g/L/h and 44.25 g/L, respectively, which were 2.6- and 1.3-fold of the control strain. Transcriptional changes of INO1 gene and CTT1 gene confirmed that endogenous lycopene can decrease oxidative stress and improve intracellular environment. CONCLUSIONS Biosynthesis of endogenous lycopene is first associated with enhancing tolerance to acetic acid in S. cerevisiae. We demonstrate that endogenous lycopene can decrease intracellular ROS level caused by acetic acid, thus increasing cell growth and ethanol production. This work innovatively puts forward a new strategy for second generation bioethanol production during lignocellulosic fermentation.
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Affiliation(s)
- Shuo Pan
- Key Laboratory of Systems Bioengineering (Ministry of Education), School of Chemical Engineering and Technology, Tianjin University, Tianjin, 300072 People’s Republic of China
- SynBio Research Platform, Collaborative Innovation Center of Chemical Science and Engineering (Tianjin), Tianjin University, Tianjin, 300072 People’s Republic of China
| | - Bin Jia
- Key Laboratory of Systems Bioengineering (Ministry of Education), School of Chemical Engineering and Technology, Tianjin University, Tianjin, 300072 People’s Republic of China
- SynBio Research Platform, Collaborative Innovation Center of Chemical Science and Engineering (Tianjin), Tianjin University, Tianjin, 300072 People’s Republic of China
| | - Hong Liu
- Key Laboratory of Systems Bioengineering (Ministry of Education), School of Chemical Engineering and Technology, Tianjin University, Tianjin, 300072 People’s Republic of China
- SynBio Research Platform, Collaborative Innovation Center of Chemical Science and Engineering (Tianjin), Tianjin University, Tianjin, 300072 People’s Republic of China
| | - Zhen Wang
- Key Laboratory of Systems Bioengineering (Ministry of Education), School of Chemical Engineering and Technology, Tianjin University, Tianjin, 300072 People’s Republic of China
- SynBio Research Platform, Collaborative Innovation Center of Chemical Science and Engineering (Tianjin), Tianjin University, Tianjin, 300072 People’s Republic of China
| | - Meng-Zhe Chai
- Key Laboratory of Systems Bioengineering (Ministry of Education), School of Chemical Engineering and Technology, Tianjin University, Tianjin, 300072 People’s Republic of China
- SynBio Research Platform, Collaborative Innovation Center of Chemical Science and Engineering (Tianjin), Tianjin University, Tianjin, 300072 People’s Republic of China
| | - Ming-Zhu Ding
- Key Laboratory of Systems Bioengineering (Ministry of Education), School of Chemical Engineering and Technology, Tianjin University, Tianjin, 300072 People’s Republic of China
- SynBio Research Platform, Collaborative Innovation Center of Chemical Science and Engineering (Tianjin), Tianjin University, Tianjin, 300072 People’s Republic of China
| | - Xiao Zhou
- Key Laboratory of Systems Bioengineering (Ministry of Education), School of Chemical Engineering and Technology, Tianjin University, Tianjin, 300072 People’s Republic of China
- SynBio Research Platform, Collaborative Innovation Center of Chemical Science and Engineering (Tianjin), Tianjin University, Tianjin, 300072 People’s Republic of China
| | - Xia Li
- Key Laboratory of Systems Bioengineering (Ministry of Education), School of Chemical Engineering and Technology, Tianjin University, Tianjin, 300072 People’s Republic of China
- SynBio Research Platform, Collaborative Innovation Center of Chemical Science and Engineering (Tianjin), Tianjin University, Tianjin, 300072 People’s Republic of China
| | - Chun Li
- Key Laboratory of Systems Bioengineering (Ministry of Education), School of Chemical Engineering and Technology, Tianjin University, Tianjin, 300072 People’s Republic of China
| | - Bing-Zhi Li
- Key Laboratory of Systems Bioengineering (Ministry of Education), School of Chemical Engineering and Technology, Tianjin University, Tianjin, 300072 People’s Republic of China
- SynBio Research Platform, Collaborative Innovation Center of Chemical Science and Engineering (Tianjin), Tianjin University, Tianjin, 300072 People’s Republic of China
| | - Ying-Jin Yuan
- Key Laboratory of Systems Bioengineering (Ministry of Education), School of Chemical Engineering and Technology, Tianjin University, Tianjin, 300072 People’s Republic of China
- SynBio Research Platform, Collaborative Innovation Center of Chemical Science and Engineering (Tianjin), Tianjin University, Tianjin, 300072 People’s Republic of China
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Maiti S, Gallastegui G, Suresh G, Sarma SJ, Brar SK, Drogui P, LeBihan Y, Buelna G, Verma M, Soccol CR. Hydrolytic pre-treatment methods for enhanced biobutanol production from agro-industrial wastes. BIORESOURCE TECHNOLOGY 2018; 249:673-683. [PMID: 29091853 DOI: 10.1016/j.biortech.2017.09.132] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/20/2017] [Revised: 09/18/2017] [Accepted: 09/19/2017] [Indexed: 06/07/2023]
Abstract
Brewery industry liquid waste (BLW), brewery spent grain (BSG), apple pomace solid wastes (APS), apple pomace ultrafiltration sludge (APUS) and starch industry wastewater (SIW) have been considered as substrates to produce biobutanol. Efficiency of hydrolysis techniques tested to produce fermentable sugars depended on nature of agro-industrial wastes and process conditions. Acid-catalysed hydrolysis of BLW and BSG gave a total reducing sugar yield of 0.433 g/g and 0.468 g/g respectively. Reducing sugar yield from microwave assisted hydrothermal method was 0.404 g/g from APS and 0.631 g/g from APUS, and, 0.359 g/g from microwave assisted acid-catalysed SIW dry mass. Parameter optimization (time, pH and substrate concentration) for acid-catalysed BLW hydrolysate utilization using central composite model technique produced 307.9 g/kg glucose with generation of inhibitors (5-hydroxymethyl furfural (20 g/kg), furfural (1.6 g/kg), levulinic acid (9.3 g/kg) and total phenolic compound (0.567 g/kg)). 10.62 g/L of acetone-butanol-ethanol was produced by subsequent clostridial fermentation of the substrate.
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Affiliation(s)
- Sampa Maiti
- Institut national de la recherche scientifique, Centre - Eau Terre Environnement, 490, Rue de la Couronne, Québec G1K 9A9 Canada
| | - Gorka Gallastegui
- Institut national de la recherche scientifique, Centre - Eau Terre Environnement, 490, Rue de la Couronne, Québec G1K 9A9 Canada; University of the Basque Country (UPV/EHU), Department of Chemical and Environmental Engineering, University College of Engineering of Vitoria/Gasteiz, Nieves Cano 12, 01006 Vitoria/Gasteiz, Spain
| | - Gayatri Suresh
- Institut national de la recherche scientifique, Centre - Eau Terre Environnement, 490, Rue de la Couronne, Québec G1K 9A9 Canada
| | - Saurabh Jyoti Sarma
- Institut national de la recherche scientifique, Centre - Eau Terre Environnement, 490, Rue de la Couronne, Québec G1K 9A9 Canada
| | - Satinder Kaur Brar
- Institut national de la recherche scientifique, Centre - Eau Terre Environnement, 490, Rue de la Couronne, Québec G1K 9A9 Canada.
| | - Patrick Drogui
- Institut national de la recherche scientifique, Centre - Eau Terre Environnement, 490, Rue de la Couronne, Québec G1K 9A9 Canada
| | - Yann LeBihan
- Centre de recherche industrielle du Québec (CRIQ), Québec, Canada
| | - Gerardo Buelna
- University of the Basque Country (UPV/EHU), Department of Chemical and Environmental Engineering, University College of Engineering of Vitoria/Gasteiz, Nieves Cano 12, 01006 Vitoria/Gasteiz, Spain
| | - Mausam Verma
- CO(2) Solutions Inc., 2300, rue Jean-Perrin, Québec, Québec G2C 1T9, Canada
| | - Carlos Ricardo Soccol
- Bioprocess Engineering and Biotechnology Department, Federal University of Paraná, Centro Politécnico, Usina Piloto B, CEP 81531-990 Curitiba, Paraná, Brazil
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Ferone M, Raganati F, Ercole A, Olivieri G, Salatino P, Marzocchella A. Continuous succinic acid fermentation by Actinobacillus succinogenes in a packed-bed biofilm reactor. BIOTECHNOLOGY FOR BIOFUELS 2018; 11:138. [PMID: 29785205 PMCID: PMC5950251 DOI: 10.1186/s13068-018-1143-7] [Citation(s) in RCA: 32] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/21/2018] [Accepted: 05/03/2018] [Indexed: 05/23/2023]
Abstract
BACKGROUND Succinic acid is one of the most interesting platform chemicals that can be produced in a biorefinery approach. In this study, continuous succinic acid production by Actinobacillus succinogenes fermentation in a packed-bed biofilm reactor (PBBR) was investigated. RESULTS The effects of the operating conditions tested, dilution rate (D), and medium composition (mixture of glucose, xylose, and arabinose-that simulate the composition of a lignocellulosic hydrolysate)-on the PBBR performances were investigated. The maximum succinic acid productivity of 35.0 g L-1 h-1 and the maximum SA concentration were achieved at a D = 1.9 h-1. The effect of HMF and furfural on succinic acid production was also investigated. HMF resulted to reduce succinic acid production by 22.6%, while furfural caused a reduction of 16% in SA production at the same dilution rate. CONCLUSION Succinic acid production by A. succinogenes fermentation in a packed-bed reactor (PBBR) was successfully carried out for more than 5 months. The optimal results were obtained at the dilution rate 0.5 h-1: 43.0 g L-1 of succinic acid were produced, glucose conversion was 88%; and the volumetric productivity was 22 g L-1 h-1.
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Affiliation(s)
- Mariateresa Ferone
- Dipartimento di Ingegneria Chimica, dei Materiali e della Produzione Industriale, Università degli Studi di Napoli Federico II, P.le V. Tecchio 80, 80125 Naples, Italy
| | - Francesca Raganati
- Dipartimento di Ingegneria Chimica, dei Materiali e della Produzione Industriale, Università degli Studi di Napoli Federico II, P.le V. Tecchio 80, 80125 Naples, Italy
| | - Alessia Ercole
- Dipartimento di Ingegneria Chimica, dei Materiali e della Produzione Industriale, Università degli Studi di Napoli Federico II, P.le V. Tecchio 80, 80125 Naples, Italy
| | - Giuseppe Olivieri
- Dipartimento di Ingegneria Chimica, dei Materiali e della Produzione Industriale, Università degli Studi di Napoli Federico II, P.le V. Tecchio 80, 80125 Naples, Italy
- Wageningen University and Research Centre, Droevendaalsesteeg 1, P.O. Box 8129, 6708 PB Wageningen, The Netherlands
| | - Piero Salatino
- Dipartimento di Ingegneria Chimica, dei Materiali e della Produzione Industriale, Università degli Studi di Napoli Federico II, P.le V. Tecchio 80, 80125 Naples, Italy
| | - Antonio Marzocchella
- Dipartimento di Ingegneria Chimica, dei Materiali e della Produzione Industriale, Università degli Studi di Napoli Federico II, P.le V. Tecchio 80, 80125 Naples, Italy
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Technological Processes for Conversion of Lignocellulosic Biomass to Bioethanol. JOURNAL OF PURE AND APPLIED MICROBIOLOGY 2017. [DOI: 10.22207/jpam.11.4.27] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
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Luo MT, Zhao C, Huang C, Chen XF, Huang QL, Qi GX, Tian LL, Xiong L, Li HL, Chen XD. Efficient Using Durian Shell Hydrolysate as Low-Cost Substrate for Bacterial Cellulose Production by Gluconacetobacter xylinus. Indian J Microbiol 2017; 57:393-399. [PMID: 29151639 PMCID: PMC5671436 DOI: 10.1007/s12088-017-0681-1] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/22/2017] [Accepted: 10/14/2017] [Indexed: 10/18/2022] Open
Abstract
Durian is one important tropical fruit with high nutritional value, but its shell is usually useless and considered as waste. To explore the efficient and high-value utilization of this agricultural and food waste, in this study, durian shell was simply hydrolyzed by dilute sulfuric acid, and the durian shell hydrolysate after detoxification was used for bacterial cellulose (BC) production by Gluconacetobacter xylinus for the first time. BC was synthesized in static culture for 10 days and the highest BC yield (2.67 g/L) was obtained at the 8th day. The typical carbon sources in the substrate including glucose, xylose, formic acid, acetic acid, etc. can be utilized by G. xylinus. The highest chemical oxygen demand (COD) removal (16.40%) was obtained at the 8th day. The highest BC yield on COD consumption and the highest BC yield on sugar consumption were 93.51% and 22.98% (w/w), respectively, suggesting this is one efficient bioconversion for BC production. Durian shell hydrolysate showed small influence on the BC structure by comparison with the structure of BC generated in traditional Hestrin-Schramm medium detected by FE-SEM, FTIR, and XRD. Overall, this technology can both solve the issue of waste durian shell and produce valuable bio-polymer (BC).
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Affiliation(s)
- Mu-Tan Luo
- Key Laboratory of Renewable Energy, Chinese Academy of Sciences, No. 2 Nengyuan Road, Tianhe District, Guangzhou, 510640 People’s Republic of China
- Guangzhou Institute of Energy Conversion, Chinese Academy of Sciences, Guangzhou, 510640 People’s Republic of China
- Guangdong Provincial Key Laboratory of New and Renewable Energy Research and Development, Guangzhou, 510640 People’s Republic of China
- University of Chinese Academy of Sciences, Beijing, 100049 People’s Republic of China
| | - Cheng Zhao
- Key Laboratory of Renewable Energy, Chinese Academy of Sciences, No. 2 Nengyuan Road, Tianhe District, Guangzhou, 510640 People’s Republic of China
- Guangzhou Institute of Energy Conversion, Chinese Academy of Sciences, Guangzhou, 510640 People’s Republic of China
- Guangdong Provincial Key Laboratory of New and Renewable Energy Research and Development, Guangzhou, 510640 People’s Republic of China
- University of Chinese Academy of Sciences, Beijing, 100049 People’s Republic of China
| | - Chao Huang
- Key Laboratory of Renewable Energy, Chinese Academy of Sciences, No. 2 Nengyuan Road, Tianhe District, Guangzhou, 510640 People’s Republic of China
- Guangzhou Institute of Energy Conversion, Chinese Academy of Sciences, Guangzhou, 510640 People’s Republic of China
- Guangdong Provincial Key Laboratory of New and Renewable Energy Research and Development, Guangzhou, 510640 People’s Republic of China
| | - Xue-Fang Chen
- Key Laboratory of Renewable Energy, Chinese Academy of Sciences, No. 2 Nengyuan Road, Tianhe District, Guangzhou, 510640 People’s Republic of China
- Guangzhou Institute of Energy Conversion, Chinese Academy of Sciences, Guangzhou, 510640 People’s Republic of China
- Guangdong Provincial Key Laboratory of New and Renewable Energy Research and Development, Guangzhou, 510640 People’s Republic of China
| | - Qian-Lin Huang
- Key Laboratory of Renewable Energy, Chinese Academy of Sciences, No. 2 Nengyuan Road, Tianhe District, Guangzhou, 510640 People’s Republic of China
- Guangzhou Institute of Energy Conversion, Chinese Academy of Sciences, Guangzhou, 510640 People’s Republic of China
- Guangdong Provincial Key Laboratory of New and Renewable Energy Research and Development, Guangzhou, 510640 People’s Republic of China
- University of Chinese Academy of Sciences, Beijing, 100049 People’s Republic of China
| | - Gao-Xiang Qi
- Key Laboratory of Renewable Energy, Chinese Academy of Sciences, No. 2 Nengyuan Road, Tianhe District, Guangzhou, 510640 People’s Republic of China
- Guangzhou Institute of Energy Conversion, Chinese Academy of Sciences, Guangzhou, 510640 People’s Republic of China
- Guangdong Provincial Key Laboratory of New and Renewable Energy Research and Development, Guangzhou, 510640 People’s Republic of China
- University of Chinese Academy of Sciences, Beijing, 100049 People’s Republic of China
| | - Lan-Lan Tian
- Key Laboratory of Renewable Energy, Chinese Academy of Sciences, No. 2 Nengyuan Road, Tianhe District, Guangzhou, 510640 People’s Republic of China
- Guangzhou Institute of Energy Conversion, Chinese Academy of Sciences, Guangzhou, 510640 People’s Republic of China
- Guangdong Provincial Key Laboratory of New and Renewable Energy Research and Development, Guangzhou, 510640 People’s Republic of China
- University of Chinese Academy of Sciences, Beijing, 100049 People’s Republic of China
| | - Lian Xiong
- Key Laboratory of Renewable Energy, Chinese Academy of Sciences, No. 2 Nengyuan Road, Tianhe District, Guangzhou, 510640 People’s Republic of China
- Guangzhou Institute of Energy Conversion, Chinese Academy of Sciences, Guangzhou, 510640 People’s Republic of China
- Guangdong Provincial Key Laboratory of New and Renewable Energy Research and Development, Guangzhou, 510640 People’s Republic of China
| | - Hai-Long Li
- Key Laboratory of Renewable Energy, Chinese Academy of Sciences, No. 2 Nengyuan Road, Tianhe District, Guangzhou, 510640 People’s Republic of China
- Guangzhou Institute of Energy Conversion, Chinese Academy of Sciences, Guangzhou, 510640 People’s Republic of China
- Guangdong Provincial Key Laboratory of New and Renewable Energy Research and Development, Guangzhou, 510640 People’s Republic of China
| | - Xin-De Chen
- Key Laboratory of Renewable Energy, Chinese Academy of Sciences, No. 2 Nengyuan Road, Tianhe District, Guangzhou, 510640 People’s Republic of China
- Guangzhou Institute of Energy Conversion, Chinese Academy of Sciences, Guangzhou, 510640 People’s Republic of China
- Guangdong Provincial Key Laboratory of New and Renewable Energy Research and Development, Guangzhou, 510640 People’s Republic of China
- Xuyi Center of Attapulgite Research Development and Industrialization, Guangzhou Institute of Energy Conversion, Chinese Academy of Sciences, Xuyi, 211700 People’s Republic of China
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Cao W, Liu B, Luo J, Yin J, Wan Y. α, ω-Dodecanedioic acid production by Candida viswanathii ipe-1 with co-utilization of wheat straw hydrolysates and n-dodecane. BIORESOURCE TECHNOLOGY 2017; 243:179-187. [PMID: 28662387 DOI: 10.1016/j.biortech.2017.06.082] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/17/2017] [Revised: 06/13/2017] [Accepted: 06/14/2017] [Indexed: 06/07/2023]
Abstract
Candida viswanathii ipe-1 was used to produce α, ω-dodecanedioic acid (DC12), which showed capability to ferment xylose and glucose simultaneously, while arabinose utilization was less efficient. A low concentration of furfural enhanced cell growth, and the addition of 4.0g/L sodium acetate largely increased DC12 production. It indicated that detoxification of the wheat straw hydrolysates was not necessary for the biosynthesis of DC12. Based on the promising features of our strain, an efficient process was developed to produce DC12 from co-utilization of wheat straw hydrolysates and n-dodecane. Using this process, 129.7g/L DC12 with a corresponding productivity of 1.13g·L-1·h-1 could be produced, which was increased by 40.0% compared with a sole carbon of glucose. The improved DC12 yield by the co-utilization of wheat straw hydrolysates and n-dodecane using C. viswanathii ipe-1 demonstrates the great potential of using biomass as a feedstock in the production of DC12.
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Affiliation(s)
- Weifeng Cao
- State Key Laboratory of Biochemical Engineering, Institute of Process Engineering, Chinese Academy of Sciences, Beijing 100190, PR China
| | - Bin Liu
- College of Food Science and Engineering, Qilu University of Technology, Jinan 250353, PR China
| | - Jianquan Luo
- State Key Laboratory of Biochemical Engineering, Institute of Process Engineering, Chinese Academy of Sciences, Beijing 100190, PR China
| | - Junxiang Yin
- China National Center for Biotechnology Development, Beijing 100036, PR China
| | - Yinhua Wan
- State Key Laboratory of Biochemical Engineering, Institute of Process Engineering, Chinese Academy of Sciences, Beijing 100190, PR China.
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Two-step economical welan gum production by Sphingomonas sp. HT-1 from sugar industrial by-products. Carbohydr Polym 2017; 181:412-418. [PMID: 29253990 DOI: 10.1016/j.carbpol.2017.09.033] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/30/2017] [Revised: 08/29/2017] [Accepted: 09/10/2017] [Indexed: 01/18/2023]
Abstract
A two-step fermentation strategy using glucose mother liquor (GML) for cell growth and xylose mother liquor (XML) for welan gum synthesis was used to alleviate uneconomic welan gum fermentation. This study revealed: (1) optimal initial GML concentration was 11.7g/L (10g/L sugars contained); (2) optimal XML feeding strategy was pseudo-exponential fed-batch and feeding time was 12thh-54thh, amounting to 25.7g/L XML (20g/L sugars contained); and (3) in a 7.5-L bioreactor, welan gum concentration was 22.68±0.50g/L and its yield reached 0.756g/g sugars with trace residual sugars. Compared with the cost of batch fermentation using glucose as sole carbon source, the final carbon source costs decreased by 61.40% and the welan gum yield increased by 50%. GML and XML can be used as inexpensive carbon sources for welan gum production with higher yield, giving them industrial application potential to produce value-added chemicals.
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Modulation of the Acetone/Butanol Ratio during Fermentation of Corn Stover-Derived Hydrolysate by Clostridium beijerinckii Strain NCIMB 8052. Appl Environ Microbiol 2017; 83:AEM.03386-16. [PMID: 28130305 DOI: 10.1128/aem.03386-16] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/15/2016] [Accepted: 01/25/2017] [Indexed: 11/20/2022] Open
Abstract
Producing biobutanol from lignocellulosic biomass has shown promise to ultimately reduce greenhouse gases and alleviate the global energy crisis. However, because of the recalcitrance of a lignocellulosic biomass, a pretreatment of the substrate is needed which in many cases releases soluble lignin compounds (SLCs), which inhibit growth of butanol-producing clostridia. In this study, we found that SLCs changed the acetone/butanol ratio (A/B ratio) during butanol fermentation. The typical A/B molar ratio during Clostridium beijerinckii NCIMB 8052 batch fermentation with glucose as the carbon source is about 0.5. In the present study, the A/B molar ratio during batch fermentation with a lignocellulosic hydrolysate as the carbon source was 0.95 at the end of fermentation. Structural and redox potential changes of the SLCs were characterized before and after fermentation by using gas chromatography/mass spectrometry and electrochemical analyses, which indicated that some exogenous SLCs were involved in distributing electron flow to C. beijerinckii, leading to modulation of the redox balance. This was further demonstrated by the NADH/NAD+ ratio and trxB gene expression profile assays at the onset of solventogenic growth. As a result, the A/B ratio of end products changed significantly during C. beijerinckii fermentation using corn stover-derived hydrolysate as the carbon source compared to glucose as the carbon source. These results revealed that SLCs not only inhibited cell growth but also modulated the A/B ratio during C. beijerinckii butanol fermentation.IMPORTANCE Bioconversion of lignocellulosic feedstocks to butanol involves pretreatment, during which hundreds of soluble lignin compounds (SLCs) form. Most of these SLCs inhibit growth of solvent-producing clostridia. However, the mechanism by which these compounds modulate electron flow in clostridia remains elusive. In this study, the results revealed that SLCs changed redox balance by producing oxidative stress and modulating electron flow as electron donors. Production of H2 and acetone was stimulated, while butanol production remained unchanged, which led to a high A/B ratio during C. beijerinckii fermentation using corn stover-derived hydrolysate as the carbon source. These observations provide insight into utilizing C. beijerinckii to produce butanol from a lignocellulosic biomass.
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Enhanced Production of Xylitol from Poplar Wood Hydrolysates Through a Sustainable Process Using Immobilized New Strain Candida tropicalis UFMG BX 12-a. Appl Biochem Biotechnol 2017; 182:1053-1064. [PMID: 28054259 DOI: 10.1007/s12010-016-2381-4] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/18/2016] [Accepted: 12/21/2016] [Indexed: 10/20/2022]
Abstract
A new strain, Candida tropicalis UFMG BX 12-a, was found to produce higher yields of xylitol on poplar wood hemicellulose hydrolysate. The hemicellulose hydrolysate liquor was detoxified using a novel method we developed, involving vacuum evaporation and solvent separation of inhibitors which made the hydrolysate free of toxins while retaining high concentrations of fermentable sugars. The effect of the detoxification method on the fermentation was also reported and compared to well-known methods reported in literature. In this study, the new strain C. tropicalis UFMG BX 12-a was used on the detoxified hydrolysate to produce xylitol. It was also compared to Candida guilliermondii FTI 20037, which has been reported to be one of the best strains for fermentative production of xylitol. To further improve the efficiency of the fermentation process, these strains were immobilized in calcium alginate beads. The yield (0.92 g g-1) and productivity (0.88 g L-1 h-1) obtained by fermenting the wood hydrolysate detoxified by our new detoxification technique using an immobilized new Candida strain were found to be higher than the values reported in literature.
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48
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Mukherjee V, Radecka D, Aerts G, Verstrepen KJ, Lievens B, Thevelein JM. Phenotypic landscape of non-conventional yeast species for different stress tolerance traits desirable in bioethanol fermentation. BIOTECHNOLOGY FOR BIOFUELS 2017; 10:216. [PMID: 28924451 PMCID: PMC5597992 DOI: 10.1186/s13068-017-0899-5] [Citation(s) in RCA: 48] [Impact Index Per Article: 6.9] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/29/2017] [Accepted: 09/04/2017] [Indexed: 05/12/2023]
Abstract
BACKGROUND Non-conventional yeasts present a huge, yet barely exploited, resource of yeast biodiversity for industrial applications. This presents a great opportunity to explore alternative ethanol-fermenting yeasts that are more adapted to some of the stress factors present in the harsh environmental conditions in second-generation (2G) bioethanol fermentation. Extremely tolerant yeast species are interesting candidates to investigate the underlying tolerance mechanisms and to identify genes that when transferred to existing industrial strains could help to design more stress-tolerant cell factories. For this purpose, we performed a high-throughput phenotypic evaluation of a large collection of non-conventional yeast species to identify the tolerance limits of the different yeast species for desirable stress tolerance traits in 2G bioethanol production. Next, 12 multi-tolerant strains were selected and used in fermentations under different stressful conditions. Five strains out of which, showing desirable fermentation characteristics, were then evaluated in small-scale, semi-anaerobic fermentations with lignocellulose hydrolysates. RESULTS Our results revealed the phenotypic landscape of many non-conventional yeast species which have not been previously characterized for tolerance to stress conditions relevant for bioethanol production. This has identified for each stress condition evaluated several extremely tolerant non-Saccharomyces yeasts. It also revealed multi-tolerance in several yeast species, which makes those species good candidates to investigate the molecular basis of a robust general stress tolerance. The results showed that some non-conventional yeast species have similar or even better fermentation efficiency compared to S. cerevisiae in the presence of certain stressful conditions. CONCLUSION Prior to this study, our knowledge on extreme stress-tolerant phenotypes in non-conventional yeasts was limited to only few species. Our work has now revealed in a systematic way the potential of non-Saccharomyces species to emerge either as alternative host species or as a source of valuable genetic information for construction of more robust industrial S. serevisiae bioethanol production yeasts. Striking examples include yeast species like Pichia kudriavzevii and Wickerhamomyces anomalus that show very high tolerance to diverse stress factors. This large-scale phenotypic analysis has yielded a detailed database useful as a resource for future studies to understand and benefit from the molecular mechanisms underlying the extreme phenotypes of non-conventional yeast species.
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Affiliation(s)
- Vaskar Mukherjee
- Laboratory of Molecular Cell Biology, Institute of Botany and Microbiology, VIB Center of Microbiology, KU Leuven, Kasteelpark Arenberg 31, B-3001 Louvain, Belgium
- Laboratory for Enzyme, Fermentation and Brewing Technology (EFBT), Department of Microbial and Molecular Systems, KU Leuven, Technology Campus Ghent, Gebroeders De Smetstraat 1, B-9000 Ghent, Belgium
- Laboratory for Process Microbial Ecology and Bioinspirational Management (PME&BIM), Department of Microbial and Molecular Systems, KU Leuven, Campus De Nayer, Fortsesteenweg 30A, B-2860, Sint-Katelijne Waver, Belgium
- Present Address: Lundberg Laboratory, Department of Marine Sciences, University of Gothenburg, Medicinaregatan 9C, 41390 Göteborg, Sweden
| | - Dorota Radecka
- Laboratory of Molecular Cell Biology, Institute of Botany and Microbiology, VIB Center of Microbiology, KU Leuven, Kasteelpark Arenberg 31, B-3001 Louvain, Belgium
| | - Guido Aerts
- Laboratory for Enzyme, Fermentation and Brewing Technology (EFBT), Department of Microbial and Molecular Systems, KU Leuven, Technology Campus Ghent, Gebroeders De Smetstraat 1, B-9000 Ghent, Belgium
| | - Kevin J. Verstrepen
- Laboratory for Systems Biology, VIB Center for Microbiology, KU Leuven, Gaston Geenslaan 1, B-3001 Louvain, Belgium
| | - Bart Lievens
- Laboratory for Process Microbial Ecology and Bioinspirational Management (PME&BIM), Department of Microbial and Molecular Systems, KU Leuven, Campus De Nayer, Fortsesteenweg 30A, B-2860, Sint-Katelijne Waver, Belgium
| | - Johan M. Thevelein
- Laboratory of Molecular Cell Biology, Institute of Botany and Microbiology, VIB Center of Microbiology, KU Leuven, Kasteelpark Arenberg 31, B-3001 Louvain, Belgium
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Tan J, Abdel-Rahman MA, Numaguchi M, Tashiro Y, Zendo T, Sakai K, Sonomoto K. Thermophilic Enterococcus faecium QU 50 enabled open repeated batch fermentation for l-lactic acid production from mixed sugars without carbon catabolite repression. RSC Adv 2017. [DOI: 10.1039/c7ra03176a] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
Thermophilic lactic acid bacterium enabled homo-l-lactic acid fermentation from hexose/pentose without carbon catabolite repression, and open repeated production by immobilization.
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Affiliation(s)
- J. Tan
- Laboratory of Microbial Technology
- Division of Systems Bioengineering
- Department of Bioscience and Biotechnology
- Faculty of Agriculture
- Graduate School
| | - M. A. Abdel-Rahman
- Laboratory of Microbial Technology
- Division of Systems Bioengineering
- Department of Bioscience and Biotechnology
- Faculty of Agriculture
- Graduate School
| | - M. Numaguchi
- Laboratory of Microbial Technology
- Division of Systems Bioengineering
- Department of Bioscience and Biotechnology
- Faculty of Agriculture
- Graduate School
| | - Y. Tashiro
- Laboratory of Soil and Environmental Microbiology
- Division of Systems Bioengineering
- Department of Bioscience and Biotechnology
- Faculty of Agriculture
- Graduate School
| | - T. Zendo
- Laboratory of Microbial Technology
- Division of Systems Bioengineering
- Department of Bioscience and Biotechnology
- Faculty of Agriculture
- Graduate School
| | - K. Sakai
- Laboratory of Soil and Environmental Microbiology
- Division of Systems Bioengineering
- Department of Bioscience and Biotechnology
- Faculty of Agriculture
- Graduate School
| | - K. Sonomoto
- Laboratory of Microbial Technology
- Division of Systems Bioengineering
- Department of Bioscience and Biotechnology
- Faculty of Agriculture
- Graduate School
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50
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Gao J, Feng H, Yuan W, Li Y, Hou S, Zhong S, Bai F. Enhanced fermentative performance under stresses of multiple lignocellulose-derived inhibitors by overexpression of a typical 2-Cys peroxiredoxin from Kluyveromyces marxianus. BIOTECHNOLOGY FOR BIOFUELS 2017; 10:79. [PMID: 28360937 PMCID: PMC5370469 DOI: 10.1186/s13068-017-0766-4] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/13/2016] [Accepted: 03/21/2017] [Indexed: 05/03/2023]
Abstract
BACKGROUND Bioethanol from lignocellulosic materials is of great significance to the production of renewable fuels due to its wide sources. However, multiple inhibitors generated from pretreatments represent great challenges for its industrial-scale fermentation. Despite the complex toxicity mechanisms, lignocellulose-derived inhibitors have been reported to be related to the levels of intracellular reactive oxygen species (ROS), which makes oxidoreductase a potential target for the enhancement of the tolerance of yeasts to these inhibitors. RESULTS A typical 2-Cys peroxiredoxin from Kluyveromyces marxianus Y179 (KmTPX1) was identified, and its overexpression was achieved in Saccharomyces cerevisiae 280. Strain TPX1 with overexpressed KmTPX1 gene showed an enhanced tolerance to oxidative stresses. Serial dilution assay indicated that KmTPX1 gene contributed to a better cellular growth behavior, when the cells were exposed to multiple lignocellulose-derived inhibitors, such as formic acid, acetic acid, furfural, ethanol, and salt. In particular, KmTPX1 expression also possessed enhanced tolerance to a mixture of formic acid, acetic acid, and furfural (FAF) with a shorter lag period. The maximum glucose consumption rate and ethanol generation rate in KmTPX1-expressing strain were significantly improved, compared with the control. The mechanism of improved tolerance to FAF depends on the lower level of intracellular ROS for cell survival under stress. CONCLUSION A new functional gene KmTPX1 from K. marxianus is firstly associated with the enhanced tolerance to multiple lignocellulose-derived inhibitors in S. cerevisiae. We provided a possible detoxification mechanism of the KmTPX1 for further theoretical research; meanwhile, we provided a powerful potential for application of the KmTPX1 overexpressing strain in ethanol production from lignocellulosic materials.
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Affiliation(s)
- Jiaoqi Gao
- School of Life Science and Biotechnology, Dalian University of Technology, Dalian, 116024 China
| | - Hualiang Feng
- School of Life Science and Biotechnology, Dalian University of Technology, Dalian, 116024 China
| | - Wenjie Yuan
- School of Life Science and Biotechnology, Dalian University of Technology, Dalian, 116024 China
| | - Yimin Li
- School of Life Science and Biotechnology, Dalian University of Technology, Dalian, 116024 China
| | - Shengbo Hou
- School of Life Science and Biotechnology, Dalian University of Technology, Dalian, 116024 China
| | - Shijun Zhong
- School of Life Science and Biotechnology, Dalian University of Technology, Dalian, 116024 China
| | - Fengwu Bai
- School of Life Science and Biotechnology, Dalian University of Technology, Dalian, 116024 China
- State Key Laboratory of Microbial Metabolism, Shanghai Jiaotong University, Shanghai, 200240 China
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