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Louie TM, Louie K, DenHartog S, Gopishetty S, Subramanian M, Arnold M, Das S. Production of bio-xylitol from D-xylose by an engineered Pichia pastoris expressing a recombinant xylose reductase did not require any auxiliary substrate as electron donor. Microb Cell Fact 2021; 20:50. [PMID: 33618706 PMCID: PMC7898734 DOI: 10.1186/s12934-021-01534-1] [Citation(s) in RCA: 9] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/23/2020] [Accepted: 01/29/2021] [Indexed: 11/23/2022] Open
Abstract
BACKGROUND Xylitol is a five-carbon sugar alcohol that has numerous beneficial health properties. It has almost the same sweetness as sucrose but has lower energy value compared to the sucrose. Metabolism of xylitol is insulin independent and thus it is an ideal sweetener for diabetics. It is widely used in food products, oral and personal care, and animal nutrition as well. Here we present a two-stage strategy to produce bio-xylitol from D-xylose using a recombinant Pichia pastoris expressing a heterologous xylose reductase gene. The recombinant P. pastoris cells were first generated by a low-cost, standard procedure. The cells were then used as a catalyst to make the bio-xylitol from D-xylose. RESULTS Pichia pastoris expressing XYL1 from P. stipitis and gdh from B. subtilis demonstrated that the biotransformation was very efficient with as high as 80% (w/w) conversion within two hours. The whole cells could be re-used for multiple rounds of catalysis without loss of activity. Also, the cells could directly transform D-xylose in a non-detoxified hemicelluloses hydrolysate to xylitol at 70% (w/w) yield. CONCLUSIONS We demonstrated here that the recombinant P. pastoris expressing xylose reductase could transform D-xylose, either in pure form or in crude hemicelluloses hydrolysate, to bio-xylitol very efficiently. This biocatalytic reaction happened without the external addition of any NAD(P)H, NAD(P)+, and auxiliary substrate as an electron donor. Our experimental design & findings reported here are not limited to the conversion of D-xylose to xylitol only but can be used with other many oxidoreductase reactions also, such as ketone reductases/alcohol dehydrogenases and amino acid dehydrogenases, which are widely used for the synthesis of high-value chemicals and pharmaceutical intermediates.
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Affiliation(s)
- Tai Man Louie
- Center for Biocatalysis & Bioprocessing, University of Iowa, Iowa City, IA, 52241, USA
| | - Kailin Louie
- Center for Biocatalysis & Bioprocessing, University of Iowa, Iowa City, IA, 52241, USA
| | - Samuel DenHartog
- Center for Biocatalysis & Bioprocessing, University of Iowa, Iowa City, IA, 52241, USA
| | - Sridhar Gopishetty
- Center for Biocatalysis & Bioprocessing, University of Iowa, Iowa City, IA, 52241, USA
| | - Mani Subramanian
- Center for Biocatalysis & Bioprocessing, University of Iowa, Iowa City, IA, 52241, USA
| | - Mark Arnold
- Center for Biocatalysis & Bioprocessing, University of Iowa, Iowa City, IA, 52241, USA
- Department of Chemistry, University of Iowa, Iowa City, IA, 52241, USA
| | - Shuvendu Das
- Center for Biocatalysis & Bioprocessing, University of Iowa, Iowa City, IA, 52241, USA.
- Department of Chemistry, University of Iowa, Iowa City, IA, 52241, USA.
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Bagheri B, Zambelli P, Vigentini I, Bauer FF, Setati ME. Investigating the Effect of Selected Non- Saccharomyces Species on Wine Ecosystem Function and Major Volatiles. Front Bioeng Biotechnol 2018; 6:169. [PMID: 30483500 PMCID: PMC6243112 DOI: 10.3389/fbioe.2018.00169] [Citation(s) in RCA: 22] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/31/2018] [Accepted: 10/25/2018] [Indexed: 11/17/2022] Open
Abstract
Natural alcoholic fermentation is initiated by a diverse population of several non-Saccharomyces yeast species. However, most of the species progressively die off, leaving only a few strongly fermentative species, mainly Saccharomyces cerevisiae. The relative performance of each yeast species is dependent on its fermentation capacity, initial cell density, ecological interactions as well as tolerance to environmental factors. However, the fundamental rules underlying the working of the wine ecosystem are not fully understood. Here we use variation in cell density as a tool to evaluate the impact of individual non-Saccharomyces wine yeast species on fermentation kinetics and population dynamics of a multi-species yeast consortium in synthetic grape juice fermentation. Furthermore, the impact of individual species on aromatic properties of wine was investigated, using Gas Chromatography-Flame Ionization Detector. Fermentation kinetics was affected by the inoculation treatment. The results show that some non-Saccharomyces species support or inhibit the growth of other non-Saccharomyces species in the multi-species consortium. Overall, the fermentation inoculated with a high cell density of Starmerella bacillaris displayed the fastest fermentation kinetics while fermentation inoculated with Hanseniaspora vineae showed the slowest kinetics. The production of major volatiles was strongly affected by the treatments, and the aromatic signature could in some cases be linked to specific non-Saccharomyces species. In particular, Wickerhamomyces anomalus at high cell density contributed to elevated levels of 2-Phenylethan-1-ol whereas Starm. bacillaris at high cell density resulted in the high production of 2-methylpropanoic acid and 3-Hydroxybutanone. The data revealed possible direct and indirect influences of individual non-Saccharomyces species within a complex consortium, on wine chemical composition.
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Affiliation(s)
- Bahareh Bagheri
- Department of Viticulture and Oenology, Institute for Wine Biotechnology, Stellenbosch University, Stellenbosch, South Africa
| | - Paolo Zambelli
- Department of Food, Environmental and Nutritional Sciences, University Degli Studi di Milano, Milan, Italy
| | - Ileana Vigentini
- Department of Food, Environmental and Nutritional Sciences, University Degli Studi di Milano, Milan, Italy
| | - Florian Franz Bauer
- Department of Viticulture and Oenology, Institute for Wine Biotechnology, Stellenbosch University, Stellenbosch, South Africa
| | - Mathabatha Evodia Setati
- Department of Viticulture and Oenology, Institute for Wine Biotechnology, Stellenbosch University, Stellenbosch, South Africa
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Bagheri B, Bauer FF, Setati ME. The Impact of Saccharomyces cerevisiae on a Wine Yeast Consortium in Natural and Inoculated Fermentations. Front Microbiol 2017; 8:1988. [PMID: 29085347 PMCID: PMC5650610 DOI: 10.3389/fmicb.2017.01988] [Citation(s) in RCA: 33] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/12/2017] [Accepted: 09/27/2017] [Indexed: 11/25/2022] Open
Abstract
Natural, also referred to as spontaneous wine fermentations, are carried out by the native microbiota of the grape juice, without inoculation of selected, industrially produced yeast or bacterial strains. Such fermentations are commonly initiated by non-Saccharomyces yeast species that numerically dominate the must. Community composition and numerical dominance of species vary significantly between individual musts, but Saccharomyces cerevisiae will in most cases dominate the late stages of the fermentation and complete the process. Nevertheless, non-Saccharomyces species contribute significantly, positively or negatively, to the character and quality of the final product. The contribution is species and strain dependent and will depend on each species or strain's absolute and relative contribution to total metabolically active biomass, and will therefore, be a function of its relative fitness within the microbial ecosystem. However, the population dynamics of multispecies fermentations are not well understood. Consequently, the oenological potential of the microbiome in any given grape must, can currently not be evaluated or predicted. To better characterize the rules that govern the complex wine microbial ecosystem, a model yeast consortium comprising eight species commonly encountered in South African grape musts and an ARISA based method to monitor their dynamics were developed and validated. The dynamics of these species were evaluated in synthetic must in the presence or absence of S. cerevisiae using direct viable counts and ARISA. The data show that S. cerevisiae specifically suppresses certain species while appearing to favor the persistence of other species. Growth dynamics in Chenin blanc grape must fermentation was monitored only through viable counts. The interactions observed in the synthetic must, were upheld in the natural must fermentations, suggesting the broad applicability of the observed ecosystem dynamics. Importantly, the presence of indigenous yeast populations did not appear to affect the broad interaction patterns between the consortium species. The data show that the wine ecosystem is characterized by both mutually supportive and inhibitory species. The current study presents a first step in the development of a model to predict the oenological potential of any given wine mycobiome.
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Affiliation(s)
| | | | - Mathabatha E. Setati
- Department of Viticulture and Oenology, Institute for Wine Biotechnology, Stellenbosch University, Stellenbosch, South Africa
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Bellasio M, Peymann A, Steiger MG, Valli M, Sipiczki M, Sauer M, Graf AB, Marx H, Mattanovich D. Complete genome sequence and transcriptome regulation of the pentose utilizing yeastSugiyamaella lignohabitans. FEMS Yeast Res 2016; 16:fow037. [DOI: 10.1093/femsyr/fow037] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 04/07/2016] [Indexed: 01/17/2023] Open
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Effects of oxygen and nutrients on xylitol and ethanol production in sugarcane bagasse hydrolyzates. Food Sci Biotechnol 2015. [DOI: 10.1007/s10068-015-0177-x] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/07/2023] Open
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von Rymon Lipinski GW. Sweeteners. ADVANCES IN BIOCHEMICAL ENGINEERING/BIOTECHNOLOGY 2014; 143:1-28. [PMID: 23887731 DOI: 10.1007/10_2013_222] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
Abstract
Polyols as sugar substitutes, intense sweeteners and some new carbohydrates are increasingly used in foods and beverages. Some sweeteners are produced by fermentation or using enzymatic conversion. Many studies for others have been published. This chapter reviews the most important sweeteners.
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8
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Tathod A, Kane T, Sanil E, Dhepe PL. Solid base supported metal catalysts for the oxidation and hydrogenation of sugars. ACTA ACUST UNITED AC 2014. [DOI: 10.1016/j.molcata.2013.09.014] [Citation(s) in RCA: 48] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
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Nozaki H, Suzuki SI, Tsuyoshi N, Yokozeki K. Production of D-Arabitol byMetschnikowia reukaufiiAJ14787. Biosci Biotechnol Biochem 2014; 67:1923-9. [PMID: 14519977 DOI: 10.1271/bbb.67.1923] [Citation(s) in RCA: 33] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Abstract
A potent producer of D-arabitol was isolated by screening of natural sources and identified as Metschnikowia reukaufii AJ14787. Resting cells of this strain can efficiently produce D-arabitol from D-glucose with a weight yield of more than 60%, and can also produce D-arabitol from several other types of sugars such as polyols, ketoses, and aldoses. To improve productivity, various culture conditions such as temperature and the concentrations of D-glucose and nitrogen sources were examined. Under optimal conditions, 206 g/l of D-arabitol was produced from D-glucose with a weight yield of 52% in 100 hours.
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Affiliation(s)
- Hiroyuki Nozaki
- Aminoscience Laboratories, Ajinomoto Co., Ltd., Kawasaki, Japan.
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10
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Li Z, Qu H, Li C, Zhou X. Direct and efficient xylitol production from xylan by Saccharomyces cerevisiae through transcriptional level and fermentation processing optimizations. BIORESOURCE TECHNOLOGY 2013; 149:413-419. [PMID: 24128404 DOI: 10.1016/j.biortech.2013.09.101] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/05/2013] [Revised: 09/19/2013] [Accepted: 09/22/2013] [Indexed: 05/27/2023]
Abstract
In this study, four engineered Saccharomyces cerevisiae carrying xylanase, β-xylosidase and xylose reductase genes by different transcriptional regulations were constructed to directly convert xylan to xylitol. According to the results, the high-copy number plasmid required a rigid selection for promoter characteristics, on the contrast, the selection of promoters could be more flexible for low-copy number plasmid. For cell growth and xylitol production, glucose and galactose were found more efficient than other sugars. The semi-aerobic condition and feeding of co-substrates were taken to improve the yield of xylitol. It was found that the strain containing high-copy number plasmid had the highest xylitol yield, but it was sensitive to the change of fermentation. However, the strain carrying low-copy number plasmid was more adaptable to different processes. By optimization of the transcriptional regulation and fermentation processes, the xylitol concentration could be increased of 1.7 folds and the yield was 0.71 g xylitol/g xylan.
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Affiliation(s)
- Zhe Li
- School of Life Science, Beijing Institute of Technology, Beijing 100081, PR China
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Pal S, Choudhary V, Kumar A, Biswas D, Mondal AK, Sahoo DK. Studies on xylitol production by metabolic pathway engineered Debaryomyces hansenii. BIORESOURCE TECHNOLOGY 2013; 147:449-455. [PMID: 24012734 DOI: 10.1016/j.biortech.2013.08.065] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/10/2013] [Revised: 08/07/2013] [Accepted: 08/09/2013] [Indexed: 05/24/2023]
Abstract
Debaryomyces hansenii is one of the most promising natural xylitol producers. As the conversion of xylitol to xylulose mediated by NAD(+) cofactor dependent xylitol dehydrogenase (XDH) reduces its xylitol yield, xylitol dehydrogenase gene (DhXDH)-disrupted mutant of D. hansenii having potential for xylose assimilating pathway stopping at xylitol, was used to study the effects of co-substrates, xylose and oxygen availability on xylitol production. Compared to low cell growth and xylitol production in cultivation medium containing xylose as the only substrate, XDH disrupted mutants grown on glycerol as co-substrate accumulated 2.5-fold increased xylitol concentration over those cells grown on glucose as co-substrate. The oxygen availability, in terms of volumetric oxygen transfer coefficient, kLa (23.86-87.96 h(-1)), affected both xylitol productivity and yield, though the effect is more pronounced on the former. The addition of extra xylose at different phases of xylitol fermentation did not enhance xylitol productivity under experimental conditions.
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Affiliation(s)
- Suksham Pal
- CSIR-Institute of Microbial Technology, Sector-39A, Chandigarh 160036, India
| | - Vikas Choudhary
- CSIR-Institute of Microbial Technology, Sector-39A, Chandigarh 160036, India
| | - Anil Kumar
- CSIR-Institute of Microbial Technology, Sector-39A, Chandigarh 160036, India
| | - Dipanwita Biswas
- CSIR-Institute of Microbial Technology, Sector-39A, Chandigarh 160036, India
| | - Alok K Mondal
- CSIR-Institute of Microbial Technology, Sector-39A, Chandigarh 160036, India
| | - Debendra K Sahoo
- CSIR-Institute of Microbial Technology, Sector-39A, Chandigarh 160036, India.
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Effect of heterologous xylose transporter expression in Candida tropicalis on xylitol production rate. Bioprocess Biosyst Eng 2013; 36:809-17. [DOI: 10.1007/s00449-013-0907-5] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/26/2012] [Accepted: 01/15/2013] [Indexed: 10/27/2022]
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13
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Misra S, Raghuwanshi S, Gupta P, Dutt K, Saxena RK. Fermentation behavior of osmophilic yeast Candida tropicalis isolated from the nectar of Hibiscus rosa sinensis flowers for xylitol production. Antonie van Leeuwenhoek 2011; 101:393-402. [PMID: 21956659 DOI: 10.1007/s10482-011-9646-2] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/05/2011] [Accepted: 09/16/2011] [Indexed: 10/17/2022]
Abstract
Eighteen yeast species belonging to seven genera were isolated from ten samples of nectar from Hibiscus rosa sinensis and investigated for xylitol production using D-xylose as sole carbon source. Amongst these isolates, no. 10 was selected as the best xylitol producer and identified as Candida tropicalis on the basis of morphological, biochemical and 26S rDNA sequencing. C. tropicalis produced 12.11 gl(-1) of xylitol in presence of 50 gl(-1) of xylose in 72 h at pH 5, 30°C and 200 rpm. The strain of C. tropicalis obtained through xylose enrichment technique has resulted in a yield of 0.5 gg(-1) with a xylitol volumetric productivity of 1.07 gl(-1)h(-1) in the presence of 300 gl(-1) of xylose through batch fermentation. This organism has been reported for the first time from Hibiscus rosa sinensis flowers. Realizing, the importance of this high valued compound, as a sugar substitute, xylose enrichment technique was developed in order to utilize even higher concentrations of xylose as substrate for maximum xylitol production.
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Affiliation(s)
- Swati Misra
- Department of Microbiology, University of Delhi South Campus, Benito Juarez Road, New Delhi, 110 021, India
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Jeon WY, Yoon BH, Ko BS, Shim WY, Kim JH. Xylitol production is increased by expression of codon-optimized Neurospora crassa xylose reductase gene in Candida tropicalis. Bioprocess Biosyst Eng 2011; 35:191-8. [PMID: 21922311 PMCID: PMC3250611 DOI: 10.1007/s00449-011-0618-8] [Citation(s) in RCA: 55] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/30/2011] [Accepted: 07/16/2011] [Indexed: 11/29/2022]
Abstract
Xylose reductase (XR) is the first enzyme in d-xylose metabolism, catalyzing the reduction of d-xylose to xylitol. Formation of XR in the yeast Candida tropicalis is significantly repressed in cells grown on medium that contains glucose as carbon and energy source, because of the repressive effect of glucose. This is one reason why glucose is not a suitable co-substrate for cell growth in industrial xylitol production. XR from the ascomycete Neurospora crassa (NcXR) has high catalytic efficiency; however, NcXR is not expressed in C. tropicalis because of difference in codon usage between the two species. In this study, NcXR codons were changed to those preferred in C. tropicalis. This codon-optimized NcXR gene (termed NXRG) was placed under control of a constitutive glyceraldehyde-3-phosphate dehydrogenase (GAPDH) promoter derived from C. tropicalis, and integrated into the genome of xylitol dehydrogenase gene (XYL2)-disrupted C. tropicalis. High expression level of NXRG was confirmed by determining XR activity in cells grown on glucose medium. The resulting recombinant strain, LNG2, showed high XR activity (2.86 U (mg of protein)−1), whereas parent strain BSXDH-3 showed no activity. In xylitol fermentation using glucose as a co-substrate with xylose, LNG2 showed xylitol production rate 1.44 g L−1 h−1 and xylitol yield of 96% at 44 h, which were 73 and 62%, respectively, higher than corresponding values for BSXDH-3 (rate 0.83 g L−1 h−1; yield 59%).
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Affiliation(s)
- Woo Young Jeon
- Department of Biological Sciences, Korea Advanced Institute of Science and Technology, 373-1, Guseong-dong, Yuseong-gu, Daejeon, 305-701, Korea
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Rodrigues RCLB, Kenealy WR, Jeffries TW. Xylitol production from DEO hydrolysate of corn stover by Pichia stipitis YS-30. J Ind Microbiol Biotechnol 2011; 38:1649-55. [PMID: 21424687 DOI: 10.1007/s10295-011-0953-4] [Citation(s) in RCA: 35] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/19/2010] [Accepted: 02/21/2011] [Indexed: 10/18/2022]
Abstract
Corn stover that had been treated with vapor-phase diethyl oxalate released a mixture of mono- and oligosaccharides consisting mainly of xylose and glucose. Following overliming and neutralization, a D-xylulokinase mutant of Pichia stipitis, FPL-YS30 (xyl3-∆1), converted the stover hydrolysate into xylitol. This research examined the effects of phosphoric or gluconic acids used for neutralization and urea or ammonium sulfate used as nitrogen sources. Phosphoric acid improved color and removal of phenolic compounds. D-Gluconic acid enhanced cell growth. Ammonium sulfate increased cell yield and maximum specific cell growth rate independently of the acid used for neutralization. The highest xylitol yield (0.61 g(xylitol)/g(xylose)) and volumetric productivity (0.18 g(xylitol)/g(xylose )l) were obtained in hydrolysate neutralized with phosphoric acid. However, when urea was the nitrogen source the cell yield was less than half of that obtained with ammonium sulfate.
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Affiliation(s)
- Rita C L B Rodrigues
- Departamento de Biotecnologia, DEBIQ, Escola de Engenharia de Lorena, EEL, USP, Universidade de São Paulo, P.O Box 116, Lorena, SP 12600-970, Brazil.
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Cheng H, Wang B, Lv J, Jiang M, Lin S, Deng Z. Xylitol production from xylose mother liquor: a novel strategy that combines the use of recombinant Bacillus subtilis and Candida maltosa. Microb Cell Fact 2011; 10:5. [PMID: 21299871 PMCID: PMC3046924 DOI: 10.1186/1475-2859-10-5] [Citation(s) in RCA: 39] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/13/2010] [Accepted: 02/07/2011] [Indexed: 11/10/2022] Open
Abstract
Background Xylose mother liquor has high concentrations of xylose (35%-40%) as well as other sugars such as L-arabinose (10%-15%), galactose (8%-10%), glucose (8%-10%), and other minor sugars. Due to the complexity of this mother liquor, further isolation of xylose by simple method is not possible. In China, more than 50,000 metric tons of xylose mother liquor was produced in 2009, and the management of sugars like xylose that present in the low-cost liquor is a problem. Results We designed a novel strategy in which Bacillus subtilis and Candida maltosa were combined and used to convert xylose in this mother liquor to xylitol, a product of higher value. First, the xylose mother liquor was detoxified with the yeast C. maltosa to remove furfural and 5-hydromethylfurfural (HMF), which are inhibitors of B. subtilis growth. The glucose present in the mother liquor was also depleted by this yeast, which was an added advantage because glucose causes carbon catabolite repression in B. subtilis. This detoxification treatment resulted in an inhibitor-free mother liquor, and the C. maltosa cells could be reused as biocatalysts at a later stage to reduce xylose to xylitol. In the second step, a recombinant B. subtilis strain with a disrupted xylose isomerase gene was constructed. The detoxified xylose mother liquor was used as the medium for recombinant B. subtilis cultivation, and this led to L-arabinose depletion and xylose enrichment of the medium. In the third step, the xylose was further reduced to xylitol by C. maltosa cells, and crystallized xylitol was obtained from this yeast transformation medium. C. maltosa transformation of the xylose-enriched medium resulted in xylitol with 4.25 g L-1·h-1 volumetric productivity and 0.85 g xylitol/g xylose specific productivity. Conclusion In this study, we developed a biological method for the purification of xylose from xylose mother liquor and subsequent preparation of xylitol by C. maltosa-mediated biohydrogenation of xylose.
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Affiliation(s)
- Hairong Cheng
- Laboratory of Microbial Metabolism and School of Life Sciences and Biotechnology, Shanghai Jiao Tong University, 800# Dongchuan Road, Shanghai, China
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Peng F, Ren JL, Xu F, Sun RC. Chemicals from Hemicelluloses: A Review. ACS SYMPOSIUM SERIES 2011. [DOI: 10.1021/bk-2011-1067.ch009] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/25/2023]
Affiliation(s)
- Feng Peng
- Institute of Biomass Chemistry and Technology, Beijing Forestry University, Beijing 100083, China
- State Key Laboratory of Pulp and Paper Engineering, South China University of Technology, Guangzhou 510640, China
| | - Jun Li Ren
- Institute of Biomass Chemistry and Technology, Beijing Forestry University, Beijing 100083, China
- State Key Laboratory of Pulp and Paper Engineering, South China University of Technology, Guangzhou 510640, China
| | - Feng Xu
- Institute of Biomass Chemistry and Technology, Beijing Forestry University, Beijing 100083, China
- State Key Laboratory of Pulp and Paper Engineering, South China University of Technology, Guangzhou 510640, China
| | - Run-Cang Sun
- Institute of Biomass Chemistry and Technology, Beijing Forestry University, Beijing 100083, China
- State Key Laboratory of Pulp and Paper Engineering, South China University of Technology, Guangzhou 510640, China
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Affiliation(s)
- Pedram Fatehi
- Chemical Engineering Department and Limerick Pulp and Paper Centre, University of New Brunswick, Fredericton, New Brunswick, Canada E3B 5A3
| | - Yonghao Ni
- Chemical Engineering Department and Limerick Pulp and Paper Centre, University of New Brunswick, Fredericton, New Brunswick, Canada E3B 5A3
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Santiago-Gómez MP, Thanh HT, De Coninck J, Cachon R, Kermasha S, Belin JM, Gervais P, Husson F. Modeling hexanal production in oxido-reducing conditions by the yeast Yarrowia lipolytica. Process Biochem 2009. [DOI: 10.1016/j.procbio.2009.04.028] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
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Rivas B, Torre P, Domínguez JM, Converti A. Maintenance and growth requirements in the metabolism of Debaryomyces hansenii performing xylose-to-xylitol bioconversion in corncob hemicellulose hydrolyzate. Biotechnol Bioeng 2009; 102:1062-73. [PMID: 18988265 DOI: 10.1002/bit.22155] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Abstract
In order to improve the biotechnological production of xylitol, the metabolism of Debaryomyces hansenii NRRL Y-7426 in corncob hemicellulose hydrolyzate has been investigated under different conditions, where either maintenance or growth requirements predominated. For this purpose, the experimental results of two sets of batch bioconversions carried out alternatively varying the starting xylose concentration in the hydrolyzate (65.6 < or = S(0) < or = 154.7 g L(-1)) or the initial biomass level (3.0 < or = X(0) < or = 54.6 g(DM) L(-1)) were used to fit a metabolic model consisting of carbon material and ATP balances based on five main activities, namely fermentative assimilation of pentoses, semi-aerobic pentose-to-pentitol bioconversion, biomass growth on pentoses, catabolic oxidation of pentoses, and acetic acid and NADH regeneration by the electron transport system. Such an approach allowed separately evaluating the main bioenergetic constants of this microbial system, that is, the specific rates of ATP and xylose consumption due to maintenance (m(ATP) = 21.0 mmol(ATP) C-mol(DM) (-1)h(-1); m(Xyl) = 6.5 C-mmol(Xyl) C-mol(DM) (-1)h(-1)) and the true yields of biomass on ATP (Y(ATP) (max) = 0.83 C-mol(DM) mol(ATP) (-1)) and on xylose (Y(Xyl) (max) = 0.93 C-mol(DM) C-mol(Xyl) (-1)). The results of this study highlighted that the system, at very high S(0) and X(0) values, dramatically increased its energy requirements for cell maintenance, owing to the occurrence of stressing conditions. In particular, for S(0) > 130 g L(-1), these activities required an ATP consumption of about 2.1 mol(ATP) L(-1), that is, a value about seven- to eightfold that observed at low substrate concentration. Such a condition led to an increase in the fraction of ATP addressed to cell maintenance from 47% to 81%. On the other hand, the very high percentage of ATP addressed to maintenance (> 96%) at very high cell concentration (X(0) > or = 25 g(DM) L(-1)) was likely due to the insufficient substrate to sustain the growth.
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Affiliation(s)
- Beatriz Rivas
- Department of Chemical and Process Engineering "G.B. Bonino," Genoa University, Via Opera Pia 15, 16145 Genoa, Italy
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Sampaio FC, Chaves-Alves VM, Converti A, Lopes Passos FM, Cavalcante Coelho JL. Influence of cultivation conditions on xylose-to-xylitol bioconversion by a new isolate of Debaryomyces hansenii. BIORESOURCE TECHNOLOGY 2008; 99:502-8. [PMID: 17350252 DOI: 10.1016/j.biortech.2007.01.017] [Citation(s) in RCA: 27] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/01/2006] [Revised: 11/04/2006] [Accepted: 01/15/2007] [Indexed: 05/14/2023]
Abstract
About 270 yeast isolates were screened for xylitol production using xylose as the sole carbon source. The best isolate, Debaryomyces hansenii UFV-170, released 5.84 g L(-1) xylitol from 10 g L(-1) xylose after 24 h, corresponding to a yield of xylitol on consumed substrate (Y(P/S)) of 0.54 g g(-1). This strain was cultivated batch-wise at variable starting concentrations of xylose (S(o)) and biomass (X(o)) and agitation intensity, in order to improve xylitol production and to evaluate, through simple carbon balances, the influence of these conditions on xylose metabolism. Under the best microaerobic conditions (S(o) = 53 g L(-1), X(o) = 1.4 g L(-1), 200 rpm), xylitol production reached 37.0 g L(-1), corresponding to xylitol volumetric productivity of 1.0 g L(-1)h(-1), specific productivity of 0.22 g g(-1)h(-1) and Y(P/S) = 0.76 g g(-1). Almost 83% of xylose was consumed for xylitol production, the rest being consumed for growth, while respiration was negligible. The new isolate appeared to be a promising alternative for industrial xylitol bioproduction.
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Affiliation(s)
- Fábio C Sampaio
- Department of Microbiology, Instituto de Biotecnologia Aplicada à Agropecuária, Federal University of Viçosa, Av. P.H. Rolfs s/n, 36571-000 Viçosa, Minas Gerais, Brazil
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22
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Rodrigues RCLB, Lu C, Lin B, Jeffries TW. Fermentation kinetics for xylitol production by a Pichia stipitis D: -xylulokinase mutant previously grown in spent sulfite liquor. Appl Biochem Biotechnol 2007; 148:199-209. [PMID: 18418752 DOI: 10.1007/s12010-007-8080-4] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/11/2007] [Accepted: 10/10/2007] [Indexed: 10/22/2022]
Abstract
Spent sulfite pulping liquor (SSL) contains lignin, which is present as lignosulfonate, and hemicelluloses that are present as hydrolyzed carbohydrates. To reduce the biological oxygen demand of SSL associated with dissolved sugars, we studied the capacity of Pichia stipitis FPL-YS30 (xyl3Delta) to convert these sugars into useful products. FPL-YS30 produces a negligible amount of ethanol while converting xylose into xylitol. This work describes the xylose fermentation kinetics of yeast strain P.stipitis FPL-YS30. Yeast was grown in rich medium supplemented with different carbon sources: glucose, xylose, or ammonia-base SSL. The SSL and glucose-acclimatized cells showed similar maximum specific growth rates (0.146 h(-1)). The highest xylose consumption at the beginning of the fermentation process occurred using cells precultivated in xylose, which showed relatively high specific activity of glucose-6-phosphate dehydrogenase (EC 1.1.1.49). However, the maximum specific rates of xylose consumption (0.19 g(xylose)/g(cel) h) and xylitol production (0.059 g(xylitol)/g(cel) h) were obtained with cells acclimatized in glucose, in which the ratio between xylose reductase (EC 1.1.1.21) and xylitol dehydrogenase (EC 1.1.1.9) was kept at higher level (0.82). In this case, xylitol production (31.6 g/l) was 19 and 8% higher than in SSL and xylose-acclimatized cells, respectively. Maximum glycerol (6.26 g/l) and arabitol (0.206 g/l) production were obtained using SSL and xylose-acclimatized cells, respectively. The medium composition used for the yeast precultivation directly reflected their xylose fermentation performance. The SSL could be used as a carbon source for cell production. However, the inoculum condition to obtain a high cell concentration in SSL needs to be optimized.
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Affiliation(s)
- Rita C L B Rodrigues
- Departamento de Biotecnologia, DEBIQ, Escola de Engenharia de Lorena, EEL, USP, Universidade de São Paulo, P.O Box 116, 12600-970, Lorena, Sao Paulo, Brazil.
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Molecular cloning and functional expression of a novelNeurospora crassa xylose reductase inSaccharomyces cerevisiae in the development of a xylose fermenting strain. ANN MICROBIOL 2007. [DOI: 10.1007/bf03175211] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022] Open
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Feron G, Mauvais G, Lherminier J, Michel J, Wang XD, Viel C, Cachon R. Metabolism of fatty acid in yeast: addition of reducing agents to the reaction medium influences β-oxidation activities, γ-decalactone production, and cell ultrastructure inSporidiobolus ruineniicultivated on ricinoleic acid methyl ester. Can J Microbiol 2007; 53:738-49. [PMID: 17668034 DOI: 10.1139/w07-028] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
The sensitivity of Sporidiobolus ruinenii yeast to the use of reducing agents, reflected in changes in the oxidoreduction potential at pH 7 (Eh7) environment, ricinoleic acid methyl ester catabolism, γ-decalactone synthesis, cofactor level, β-oxidation activity, and ultrastructure of the cell, was studied. Three environmental conditions (corresponding to oxidative, neutral, and reducing conditions) were fixed with the use of air or air and reducing agents (hydrogen and dithiothreitol). Lowering Eh7to neutral conditions (Eh7 = +30 mV and +2.5 mV) favoured the production of lactone more than the more oxidative condition (Eh7 = +350 mV). In contrast, when a reducing condition was used (Eh7= –130 mV), the production of γ-decalactone was very low. These results were linked to changes in the cofactor ratio during lactone production, to the β-oxidation activity involved in decanolide synthesis, and to ultrastructural modification of the cell.
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Affiliation(s)
- Gilles Feron
- Laboratoire de microbiologie, UMR INRA-UB 1232, INRA, 17 rue Sully, B.P. 86510, F-21065 Dijon, France.
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Cirino PC, Chin JW, Ingram LO. EngineeringEscherichia colifor xylitol production from glucose-xylose mixtures. Biotechnol Bioeng 2006; 95:1167-76. [PMID: 16838379 DOI: 10.1002/bit.21082] [Citation(s) in RCA: 100] [Impact Index Per Article: 5.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Abstract
The range of value-added chemicals produced by Escherichia coli from simple sugars has been expanded to include xylitol. This was accomplished by screening the in vivo activity of a number of heterologous xylitol-producing enzymes. Xylose reductases from Candida boidinii (CbXR), Candida tenuis (CtXR), Pichia stipitis (PsXR), and Saccharmoyces cerivisiae (ScXR), and xylitol dehydrogenases from Gluconobacter oxydans (GoXDH) and Pichia stipitis (PsXDH) were all functional in E. coli to varying extents. Replacement of E. coli's native cyclic AMP receptor protein (CRP) with a cyclic AMP-independent mutant (CRP*) facilitated xylose uptake and xylitol production from mixtures of glucose and xylose, with glucose serving as the growth substrate and source of reducing equivalents. Of the enzymes tested, overexpression of NADPH-dependent CbXR produced the highest concentrations of xylitol in shake-flask cultures (approximately 275 mM in LB cultures, approximately 180 mM using minimal medium). Expression of CbXR in strain PC09 (crp*, DeltaxylB) in a 10-L controlled fermentation containing minimal medium resulted in production of approximately 250 mM xylitol (38 g/L), with concomitant utilization of approximately 150 mM glucose. The ratio of moles xylitol produced (from xylose) per mole glucose consumed was improved to > 3.7:1 using metabolically active "resting" cells.
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Affiliation(s)
- Patrick C Cirino
- Department of Chemical Engineering, Pennsylvania State University, University Park, Pennsylvania 16802, USA
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Guo C, Zhao C, He P, Lu D, Shen A, Jiang N. Screening and characterization of yeasts for xylitol production. J Appl Microbiol 2006; 101:1096-104. [PMID: 17040233 DOI: 10.1111/j.1365-2672.2006.02994.x] [Citation(s) in RCA: 62] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
AIMS To discover novel naturally occurring xylitol producing yeast species with potential for industrial applications. METHODS AND RESULTS Exactly 274 strains were cultivated on both solid and liquid screening medium with xylose as the sole carbon resource. Five strains were selected on the basis of significant growth and high degree of xylose assimilation. Their phylogenetic position was confirmed by the PCR-RFLP and sequence analysis of the D1/D2 domain of the 5' end of the large subunit rDNA gene (5'-LSU rDNA). Enzymatic analysis was conducted to compare xylose metabolism in each strain. Candida guilliermondii Xu280 and Candida maltosa Xu316 were found to have high xylose consumption rates and xylitol yields in the batch fermentation under micro-aerobic condition. The effect of the different media with high initial xylose concentration on biosynthesis of xylitol by both strains was investigated. CONCLUSIONS We have identified Candida spp. strains, which exhibit high levels of xylitol production from xylose suggesting that these may have potential for industrial applications. SIGNIFICANCE AND IMPACTS OF THE STUDY Microbial species are of importance for xylitol production. Xylitol production involves complicated metabolic regulation including xylose transport, production of key enzymes and cofactor regeneration. Thus, screening of naturally occurring xylose-utilizing micro-organisms is a viable and effective mean to obtain xylitol producing organisms with industrial application. Moreover, the research on selected strains will contribute to a better understanding of regulatory properties of xylose metabolism in different yeasts.
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Affiliation(s)
- C Guo
- Centre of Microbial Biotechnology, Institute of Microbiology, Chinese Academy of Sciences, Beijing, China
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Sampaio FC, De Faveri D, Mantovani HC, Passos FML, Perego P, Converti A. Use of response surface methodology for optimization of xylitol production by the new yeast strain Debaryomyces hansenii UFV-170. J FOOD ENG 2006. [DOI: 10.1016/j.jfoodeng.2005.05.055] [Citation(s) in RCA: 17] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
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Guo C, He P, Lu D, Shen A, Jiang N. Cloning and molecular characterization of a gene coding D-xylulokinase (CmXYL3) from Candida maltosa. J Appl Microbiol 2006; 101:139-50. [PMID: 16834601 DOI: 10.1111/j.1365-2672.2006.02915.x] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
AIMS To clone and identify a gene (CmXYL3) coding D-xylulokinase from Candida maltosa Xu316 and understand its physiological function. METHODS AND RESULTS Based on the conserved regions of the known D-xylulokinase-encoding genes, a pair of degenerate primers was designed to clone the CmXYL3 gene from C. maltosa Xu316. The coding region and sequences flanking the CmXYL3 gene were obtained by PCR-based DNA walking method. Southern blotting analysis suggested that there is a single copy of the CmXYL3 gene in the genome. The open reading frame starting from ATG and ending with TAG stop codon encoded 616 amino acids with a calculated molecular mass of 68889.743 Da. The CmXYL3 gene under the control of the GPD1 promoter was heterologously expressed in Saccharomyces cerevisiae deficient in D-xylulokinase (deltaScXKS1::LEU2) activity, and restored growth on D-xylulose. The specific activity of D-xylulokinase varied during xylose fermentation and was correlated with aeration level. After growth on different pentoses and pentitols as sole carbon sources, the highest specific activity of D-xylulokinase was observed on D-xylose. CONCLUSIONS The CmXYL3 gene isolated from C. maltosa Xu316 encodes a novel D-xylulokinase that plays a pivotal role in xylulose metabolism. SIGNIFICANCE AND IMPACT OF THE STUDY This is the first report that describes the isolation and cloning of D-xylulokinase gene (CmXYL3) from C. maltosa Xu316. D-xylulokinase is pivotal for growth and product formation during xylose metabolism. Better understanding of the biochemical properties and the physiological function of D-xylulokinase will contribute to optimizing fermentation conditions and determining the strategies for metabolic engineering of C. maltosa Xu316 for further improvement of xylitol yield and productivity.
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Affiliation(s)
- C Guo
- Centre of Microbial Biotechnology, Institute of Microbiology, Chinese Academy of Sciences, Beijing, PR China
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Ko BS, Rhee CH, Kim JH. Enhancement of xylitol productivity and yield using a xylitol dehydrogenase gene-disrupted mutant of Candida tropicalis under fully aerobic conditions. Biotechnol Lett 2006; 28:1159-62. [PMID: 16810450 DOI: 10.1007/s10529-006-9068-9] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/21/2005] [Accepted: 04/04/2006] [Indexed: 10/24/2022]
Abstract
The effects of glycerol and the oxygen transfer rate on the xylitol production rate by a xylitol dehydrogenase gene (XYL2)-disrupted mutant of Candida tropicalis were investigated. The mutant produced xylitol near the almost yield of 100% from D: -xylose using glycerol as a co-substrate for cell growth and NADPH regeneration: 50 g D: -xylose l(-1) was completely converted into xylitol when at least 20 g glycerol l(-1) was used as a co-substrate. The xylitol production rate increased with the O(2) transfer rate until saturation and it was not necessary to control the dissolved O(2) tension precisely. Under the optimum conditions, the volumetric productivity and xylitol yield were 3.2 g l(-1) h(-1) and 97% (w/w), respectively.
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Affiliation(s)
- Byoung Sam Ko
- Department of Biological Sciences, Korea Advanced Institute of Science and Technology, 373-1 Guseong-dong, Yuseong-gu, Daejeon, 305-701, Republic of Korea
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Li XJ, Chen T, Chen X, Zhao XM. Redirection electron flow to high coupling efficiency of terminal oxidase to enhance riboflavin biosynthesis. Appl Microbiol Biotechnol 2006; 73:374-83. [PMID: 16736087 DOI: 10.1007/s00253-006-0482-7] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/29/2005] [Revised: 04/19/2006] [Accepted: 04/21/2006] [Indexed: 10/24/2022]
Abstract
The metabolic impact of redirection electron flow to high coupling efficiency of terminal oxidases on riboflavin biosynthetic ability was quantitatively assessed during batch culture in this paper. While disruption of the low coupling bd oxidase of the riboflavin overproducing B. subtilis PK, the apparent phenotype with more rapid specific growth rate and higher biomass yield was achieved. Compared to by-products formation, a discernible shift to less acetate and more acetoin in cyd mutant was observed. As the overflow metabolism was decreased in B. subtilis PK cyd, more carbon source was directed to biomass and riboflavin biosynthetic pathway, which resulted in higher biomass and about 30% improvement of riboflavin biosynthetic ability. The higher product-corrected biomass yield in mutant showed that the efficient energy generation is an important factor for exponential growth of riboflavin overproducing B. subtilis strain in batch culture.
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Affiliation(s)
- Xiao-Jing Li
- School of Chemical Engineering and Technology, Tianjin University, Tianjin 300072, People's Republic of China
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Husson F, Tu VP, Santiago-Gomez M, Cachon R, Feron G, Nicaud JM, Kermasha S, Belin JM. Effect of redox potential on the growth of Yarrowia lipolytica and the biosynthesis and activity of heterologous hydroperoxide lyase. ACTA ACUST UNITED AC 2006. [DOI: 10.1016/j.molcatb.2006.01.021] [Citation(s) in RCA: 26] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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Waché Y, Husson F, Feron G, Belin JM. Yeast as an efficient biocatalyst for the production of lipid-derived flavours and fragrances. Antonie van Leeuwenhoek 2006; 89:405-16. [PMID: 16779636 DOI: 10.1007/s10482-005-9049-3] [Citation(s) in RCA: 32] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Accepted: 11/21/2005] [Indexed: 11/29/2022]
Abstract
Responding to consumer' demand for natural products, biotechnology is constantly seeking new biocatalysts. In the field of hydrophobic substrate degradation, some yeast species known some years ago as non-conventional, have acquired their right to be considered as good biocatalysts. These Candida, Yarrowia, Sporobolomyces ... are now used for themselves or for their lipases in processes to produce flavours and fragrances. In this paper we present some examples of use of these biocatalysts to generate high-value compounds and discuss the new trends related to progress in the development of molecular tools or the mastering of the redox characteristics of the medium.
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Affiliation(s)
- Y Waché
- Laboratoire de Microbiologie UMR UB-INRA, ENSBANA, 1 esplanade Erasme, 21000, Dijon, France.
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Ko BS, Jung HC, Kim JH. Molecular Cloning and Characterization of NAD+-Dependent Xylitol Dehydrogenase fromCandida tropicalisATCC 20913. Biotechnol Prog 2006. [DOI: 10.1002/bp060263i] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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Jin YS, Cruz J, Jeffries TW. Xylitol production by a Pichia stipitis D-xylulokinase mutant. Appl Microbiol Biotechnol 2005; 68:42-5. [PMID: 15635458 DOI: 10.1007/s00253-004-1854-5] [Citation(s) in RCA: 36] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/16/2004] [Revised: 11/01/2004] [Accepted: 11/12/2004] [Indexed: 11/25/2022]
Abstract
Xylitol production by Pichia stipitis FPL-YS30, a xyl3-delta1 mutant that metabolizes xylose using an alternative metabolic pathway, was investigated under aerobic and oxygen-limited culture conditions. Under both culture conditions, FPL-YS30 (xyl3-delta1) produced a negligible amount of ethanol and converted xylose mainly into xylitol with comparable yields (0.30 and 0.27 g xylitol/g xylose). However, xylose consumption increased five-fold under aerobic compared to oxygen-limited conditions. This suggests that the efficiency of the alternative route of xylose assimilation is affected by respiration. As a result, the FPL-YS30 strain produced 26 g/l of xylitol, and exhibited a higher volumetric productivity (0.22 g xylitol l(-1) h(-1)) under aerobic conditions.
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Affiliation(s)
- Yong-Su Jin
- Department of Food Science, University of Wisconsin-Madison, 1550 Linden Drive, Madison, WI 53706, USA
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Lee JK, Koo BS, Kim SY. Cloning and characterization of the xyl1 gene, encoding an NADH-preferring xylose reductase from Candida parapsilosis, and its functional expression in Candida tropicalis. Appl Environ Microbiol 2004; 69:6179-88. [PMID: 14532079 PMCID: PMC201247 DOI: 10.1128/aem.69.10.6179-6188.2003] [Citation(s) in RCA: 97] [Impact Index Per Article: 4.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
Abstract
Xylose reductase (XR) is a key enzyme in D-xylose metabolism, catalyzing the reduction of D-xylose to xylitol. An NADH-preferring XR was purified to homogeneity from Candida parapsilosis KFCC-10875, and the xyl1 gene encoding a 324-amino-acid polypeptide with a molecular mass of 36,629 Da was subsequently isolated using internal amino acid sequences and 5' and 3' rapid amplification of cDNA ends. The C. parapsilosis XR showed high catalytic efficiency (kcat/Km = 1.46 s(-1) mM(-1)) for D-xylose and showed unusual coenzyme specificity, with greater catalytic efficiency with NADH (kcat/Km = 1.39 x 10(4) s(-1) mM(-1)) than with NADPH (kcat/Km = 1.27 x 10(2) s(-1) mM(-1)), unlike all other aldose reductases characterized. Studies of initial velocity and product inhibition suggest that the reaction proceeds via a sequentially ordered Bi Bi mechanism, which is typical of XRs. Candida tropicalis KFCC-10960 has been reported to have the highest xylitol production yield and rate. It has been suggested, however, that NADPH-dependent XRs, including the XR of C. tropicalis, are limited by the coenzyme availability and thus limit the production of xylitol. The C. parapsilosis xyl1 gene was placed under the control of an alcohol dehydrogenase promoter and integrated into the genome of C. tropicalis. The resulting recombinant yeast, C. tropicalis BN-1, showed higher yield and productivity (by 5 and 25%, respectively) than the wild strain and lower production of by-products, thus facilitating the purification process. The XRs partially purified from C. tropicalis BN-1 exhibited dual coenzyme specificity for both NADH and NADPH, indicating the functional expression of the C. parapsilosis xyl1 gene in C. tropicalis BN-1. This is the first report of the cloning of an xyl1 gene encoding an NADH-preferring XR and its functional expression in C. tropicalis, a yeast currently used for industrial production of xylitol.
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Affiliation(s)
- Jung-Kul Lee
- BioNgene Co., Ltd., Jongro-Ku, Seoul 110-521, Korea.
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Náhlı́k J, Palatová M, Gı́rio F, Roseiro C. Model identification and physiological control of xylitol production using Debaryomyces hansenii. Process Biochem 2003. [DOI: 10.1016/s0032-9592(02)00256-x] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
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Nosek J, Adamíková L, Zemanová J, Tomáska L, Zufferey R, Mamoun CB. Genetic manipulation of the pathogenic yeast Candida parapsilosis. Curr Genet 2002; 42:27-35. [PMID: 12420143 DOI: 10.1007/s00294-002-0326-7] [Citation(s) in RCA: 28] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/11/2002] [Revised: 07/25/2002] [Accepted: 08/12/2002] [Indexed: 11/30/2022]
Abstract
Candida parapsilosis is an important human pathogen, responsible for severe cases of systemic candidiasis and one of the leading causes of mortality in neonates. In this report, we describe the first system for genetic manipulation of C. parapsilosis. We isolated and subsequently determined DNA sequences of genes encoding galactokinase ( CpGAL1) and orotidine-5'-phosphate decarboxylase ( CpURA3) from a genomic DNA library of C. parapsilosis by functional complementation of corresponding mutations in Saccharomyces cerevisiae. The predicted protein products, Gal1p and Ura3p, displayed a high degree of homology with corresponding sequences of C. albicans and S. cerevisiae, respectively. A collection of galactokinase-deficient ( gal1) strains of C. parapsilosis was prepared using direct selection of mutagenized cells on media containing 2-deoxy-galactose. Additionally, we constructed a plasmid vector carrying CpGAL1 as a selection marker and a genomic DNA fragment with an autonomously replicating sequence activity that transforms the C. parapsilosis gal1 mutant strain with high efficiency. This system for genetic transformation of C. parapsilosis may significantly advance the study of this human pathogen, greatly improving our understanding of its biology and virulence, with implications for drug development.
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Affiliation(s)
- Jozef Nosek
- Department of Biochemistry, Faculty of Natural Sciences, Comenius University, Mlynská dolina CH-1, 84215 Bratislava, Slovakia.
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Development of xylitol oxidase-based flow injection analysis for monitoring of xylitol concentrations. Anal Chim Acta 2002. [DOI: 10.1016/s0003-2670(02)00046-6] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
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Abstract
The growth characteristics of the sourdough yeast Candida milleri was studied in a carbon-limited aerobic chemostat culture on defined medium. The effect of glucose, xylose, and glucose-xylose mixture on metabolite production and on key enzyme activities was evaluated. Xylose as a sole carbon source was not metabolized by C. milleri. Glucose as a sole carbon source produced only biomass and carbon dioxide. When a glucose-xylose mixture (125:125 C-mM) was used as a carbon source, a small amount of xylose was consumed and a low concentration of xylitol was produced (7.20 C-mM). Enzymatic assays indicated that C. milleri does not possess xylitol dehydrogenase activity and its xylose reductase is exclusively NADPH-dependent. In glucose medium both NAD(+)- and NADP(+)-dependent aldehyde dehydrogenase activities were found, whereas in a glucose-xylose medium only NADP(+)-dependent aldehyde dehydrogenase activity was detected. The developed metabolic flux analysis corresponded well with the experimentally measured values of metabolite production, oxygen consumption (OUR), and carbon dioxide production (CER). Turnover number in generation and consumption of ATP, mitochondrial and cytosolic NADH, and cytosolic NADPH could be calculated and redox balance was achieved. Constraints were imposed on the flux estimates such that the directionality of irreversible reactions is not violated, and cofactor dependence of the measured enzyme activities were taken into account in constructing the metabolic flux network.
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Affiliation(s)
- T B Granström
- Helsinki University of Technology, Department of Chemical Technology, Laboratory of Bioprocess Engineering, POB 6100, FIN-02015HUT, Finland.
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40
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Wang XD, Mauvais G, Cachon R, Diviès C, Feron G. Addition of reducing agent dithiothreitol improves 4-decanolide synthesis by the genus Sporidiobolus. J Biosci Bioeng 2000; 90:338-40. [PMID: 16232867 DOI: 10.1016/s1389-1723(00)80092-4] [Citation(s) in RCA: 15] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/02/2000] [Accepted: 06/09/2000] [Indexed: 11/16/2022]
Abstract
Two species of the genus Sporidiobolus, S. johnsonii and S. ruinenii, were used to study the effect of the reducing agent, dithiothreitol (DTT), on 4-decanolide production using ricinoleic acid as the substrate. The results indicate that the addition of DTT into the cultures significantly enhanced 4-decanolide biosynthesis by the two species.
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Affiliation(s)
- X D Wang
- UMR de Microbiologie, Université de Bourgogne-ENSBANA-INRA, 1 Esplanade Erasme, Dijon, France
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41
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Nakano K, Katsu R, Tada K, Matsumura M. Production of highly concentrated xylitol by Candida magnoliae under a microaerobic condition maintained by simple fuzzy control. J Biosci Bioeng 2000; 89:372-6. [PMID: 16232761 DOI: 10.1016/s1389-1723(00)88961-6] [Citation(s) in RCA: 16] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/24/1999] [Accepted: 01/27/2000] [Indexed: 10/17/2022]
Abstract
Microbial production of xylitol from xylose was investigated using Candida magnoliae. In particular, the effect of the oxygenation condition on the xylitol production yield was examined and the significance of maintaining a microaerobic condition was demonstrated. A simple system of fuzzy logic control (FLC) was devised to maintain the microaerobic condition in the xylitol production phase by regulating the proportion of air (air flow rate) supplied to the fermentor. The input variables to the fuzzy control system were the dissolved oxygen (DO) concentration in the culture broth and the CO2 concentration in the exit gas. A batch cultivation test using the FLC system confirmed the importance of maintaining a constant microaerobic condition throughout the xylitol production phase, and indicated it would be advantageous for this phase to be prolonged. An intermittent fed-batch culture was therefore carried out. The FLC system allowed a constant microaerobic condition to be maintained, resulting in minimal cell mass production and constant xylitol accumulation in the culture medium. As a consequence, a very high xylitol concentration of 356 g/dm3 could be attained. The xylitol yield in the fed-batch culture was 0.75, which corresponded to 82% of the theoretical yield.
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Affiliation(s)
- K Nakano
- Institute of Applied Biochemistry, University of Tsukuba, 1-1-1 Tennodai, Tsukuba, Ibaraki 305-0006, Japan
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42
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Kim YS, Kim SY, Kim JH, Kim SC. Xylitol production using recombinant Saccharomyces cerevisiae containing multiple xylose reductase genes at chromosomal delta-sequences. J Biotechnol 1999; 67:159-71. [PMID: 9990733 DOI: 10.1016/s0168-1656(98)00172-2] [Citation(s) in RCA: 23] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
Xylitol production from xylose was studied using recombinant Saccharomyces cerevisiae 2805 containing xylose reductase genes (XYL1) of Pichia stipitis at chromosomal delta-sequences. S. cerevisiae 2805-39-40, which contains about 40 copies of the XYL1 gene on the chromosome, was obtained by a sequential transformation using a dominant selection marker neor and an auxotrophic marker URA3. The multiple XYL1 genes were stably maintained on the chromosome even after 21 and 10 days in the non-selective sequential batch and chemostat cultures, respectively, whereas S. cerevisiae 2805:pVTXR, which harbors the episomal plasmid pVTXR having the XYL1 gene, showed mitotic plasmid instability and more than 95% of the cells lost the plasmid under the same culture conditions. In the first batch (3 days) of the sequential batch culture, volumetric xylitol productivity was 0.18 g l-1 h-1 for S. cerevisiae 2805-39-40, as compared to 0.21 g l-1 h-1 for S. cerevisiae 2805:pVTXR. However, the xylitol productivity of the latter started to decrease rapidly in the third batch and dropped to 0.04 g l-1 h-1 in the seventh batch, whereas the former maintained the stable xylitol productivity at 0.18 g l-1 h-1 through the entire sequential batch culture. The xylitol production level in the chemostat culture was about 8 g l-1 for S. cerevisiae 2805-39-40, as compared to 2.0 g l-1 for S. cerevisiae 2805:pVTXR after 10 days of cultures even though the xylitol production level of the latter was higher than that of the former for the first 5 days. The results of this experiment indicate that S. cerevisiae containing the multiple XYL1 genes on the chromosome is much more efficient for the xylitol production in the long-term non-selective culture than S. cerevisiae harboring the episomal plasmid containing the XYL1 gene.
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Affiliation(s)
- Y S Kim
- Department of Biological Sciences, Korea Advanced Institute of Science and Technology, Taejon, South Korea
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