1
|
Asemoloye MD, Bello TS, Oladoye PO, Remilekun Gbadamosi M, Babarinde SO, Ebenezer Adebami G, Olowe OM, Temporiti MEE, Wanek W, Marchisio MA. Engineered yeasts and lignocellulosic biomaterials: shaping a new dimension for biorefinery and global bioeconomy. Bioengineered 2023; 14:2269328. [PMID: 37850721 PMCID: PMC10586088 DOI: 10.1080/21655979.2023.2269328] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/24/2023] [Accepted: 10/03/2023] [Indexed: 10/19/2023] Open
Abstract
The next milestone of synthetic biology research relies on the development of customized microbes for specific industrial purposes. Metabolic pathways of an organism, for example, depict its chemical repertoire and its genetic makeup. If genes controlling such pathways can be identified, scientists can decide to enhance or rewrite them for different purposes depending on the organism and the desired metabolites. The lignocellulosic biorefinery has achieved good progress over the past few years with potential impact on global bioeconomy. This principle aims to produce different bio-based products like biochemical(s) or biofuel(s) from plant biomass under microbial actions. Meanwhile, yeasts have proven very useful for different biotechnological applications. Hence, their potentials in genetic/metabolic engineering can be fully explored for lignocellulosic biorefineries. For instance, the secretion of enzymes above the natural limit (aided by genetic engineering) would speed-up the down-line processes in lignocellulosic biorefineries and the cost. Thus, the next milestone would greatly require the development of synthetic yeasts with much more efficient metabolic capacities to achieve basic requirements for particular biorefinery. This review gave comprehensive overview of lignocellulosic biomaterials and their importance in bioeconomy. Many researchers have demonstrated the engineering of several ligninolytic enzymes in heterologous yeast hosts. However, there are still many factors needing to be well understood like the secretion time, titter value, thermal stability, pH tolerance, and reactivity of the recombinant enzymes. Here, we give a detailed account of the potentials of engineered yeasts being discussed, as well as the constraints associated with their development and applications.
Collapse
Affiliation(s)
- Michael Dare Asemoloye
- School of Pharmaceutical Science and Technology, Tianjin University, Tianjin, Nankai District, China
- Department of Microbiology and Ecosystem Science, University of Vienna, Vienna, Austria
| | - Tunde Sheriffdeen Bello
- Department of Plant Biology, School of Life Sciences, Federal University of Technology Minna, Minna Niger State, Nigeria
| | | | | | - Segun Oladiran Babarinde
- Department of Plant, Food and Environmental Sciences, Faculty of Agriculture, Dalhousie University, Truro, Nova Scotia, Canada
| | | | - Olumayowa Mary Olowe
- Food Security and Safety Focus Area, Faculty of Natural and Agricultural Sciences, North-West University, Private Mail Bag, Mmabatho, South Africa
| | | | - Wolfgang Wanek
- Department of Microbiology and Ecosystem Science, University of Vienna, Vienna, Austria
| | - Mario Andrea Marchisio
- School of Pharmaceutical Science and Technology, Tianjin University, Tianjin, Nankai District, China
| |
Collapse
|
2
|
Cheng J, Zhang C, Zhang K, Li J, Hou Y, Xin J, Sun Y, Xu C, Xu W. Cyanobacteria-Mediated Light-Driven Biotransformation: The Current Status and Perspectives. ACS OMEGA 2023; 8:42062-42071. [PMID: 38024730 PMCID: PMC10653055 DOI: 10.1021/acsomega.3c05407] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 07/26/2023] [Revised: 09/29/2023] [Accepted: 10/11/2023] [Indexed: 12/01/2023]
Abstract
Most chemicals are manufactured by traditional chemical processes but at the expense of toxic catalyst use, high energy consumption, and waste generation. Biotransformation is a green, sustainable, and cost-effective process. As cyanobacteria can use light as the energy source to power the synthesis of NADPH and ATP, using cyanobacteria as the chassis organisms to design and develop light-driven biotransformation platforms for chemical synthesis has been gaining attention, since it can provide a theoretical and practical basis for the sustainable and green production of chemicals. Meanwhile, metabolic engineering and genome editing techniques have tremendous prospects for further engineering and optimizing chassis cells to achieve efficient light-driven systems for synthesizing various chemicals. Here, we display the potential of cyanobacteria as a promising light-driven biotransformation platform for the efficient synthesis of green chemicals and current achievements of light-driven biotransformation processes in wild-type or genetically modified cyanobacteria. Meanwhile, future perspectives of one-pot enzymatic cascade biotransformation from biobased materials in cyanobacteria have been proposed, which could provide additional research insights for green biotransformation and accelerate the advancement of biomanufacturing industries.
Collapse
Affiliation(s)
- Jie Cheng
- School
of Life Sciences, Liaocheng University, Liaocheng, Shandong 252000, China
| | - Chaobo Zhang
- School
of Life Sciences, Liaocheng University, Liaocheng, Shandong 252000, China
| | - Kaidian Zhang
- State
Key Laboratory of Marine Resource Utilization in the South China Sea,
School of Marine Biology and Aquaculture, Hainan University, Haikou, Hainan 570100, China
- Xiamen
Key Laboratory of Urban Sea Ecological Conservation and Restoration,
State Key Laboratory of Marine Environmental Science, College of Ocean
and Earth Sciences, Xiamen University, Xiamen, Fujian 361005, China
| | - Jiashun Li
- Xiamen
Key Laboratory of Urban Sea Ecological Conservation and Restoration,
State Key Laboratory of Marine Environmental Science, College of Ocean
and Earth Sciences, Xiamen University, Xiamen, Fujian 361005, China
| | - Yuyong Hou
- Key
Laboratory of Engineering Biology for Low-Carbon Manufacturing, Tianjin Institute of Industrial Biotech-nology, Chinese
Academy of Sciences, Tianjin 300308, China
| | - Jiachao Xin
- School
of Life Sciences, Liaocheng University, Liaocheng, Shandong 252000, China
| | - Yang Sun
- School
of Life Sciences, Liaocheng University, Liaocheng, Shandong 252000, China
| | - Chengshuai Xu
- School
of Life Sciences, Liaocheng University, Liaocheng, Shandong 252000, China
| | - Wei Xu
- School
of Life Sciences, Liaocheng University, Liaocheng, Shandong 252000, China
| |
Collapse
|
3
|
Soares Rodrigues CI, den Ridder M, Pabst M, Gombert AK, Wahl SA. Comparative proteome analysis of different Saccharomyces cerevisiae strains during growth on sucrose and glucose. Sci Rep 2023; 13:2126. [PMID: 36746999 PMCID: PMC9902475 DOI: 10.1038/s41598-023-29172-0] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/14/2022] [Accepted: 01/30/2023] [Indexed: 02/08/2023] Open
Abstract
Both the identity and the amount of a carbon source present in laboratory or industrial cultivation media have major impacts on the growth and physiology of a microbial species. In the case of the yeast Saccharomyces cerevisiae, sucrose is arguably the most important sugar used in industrial biotechnology, whereas glucose is the most common carbon and energy source used in research, with many well-known and described regulatory effects, e.g. glucose repression. Here we compared the label-free proteomes of exponentially growing S. cerevisiae cells in a defined medium containing either sucrose or glucose as the sole carbon source. For this purpose, bioreactor cultivations were employed, and three different strains were investigated, namely: CEN.PK113-7D (a common laboratory strain), UFMG-CM-Y259 (a wild isolate), and JP1 (an industrial bioethanol strain). These strains present different physiologies during growth on sucrose; some of them reach higher specific growth rates on this carbon source, when compared to growth on glucose, whereas others display the opposite behavior. It was not possible to identify proteins that commonly presented either higher or lower levels during growth on sucrose, when compared to growth on glucose, considering the three strains investigated here, except for one protein, named Mnp1-a mitochondrial ribosomal protein of the large subunit, which had higher levels on sucrose than on glucose, for all three strains. Interestingly, following a Gene Ontology overrepresentation and KEGG pathway enrichment analyses, an inverse pattern of enriched biological functions and pathways was observed for the strains CEN.PK113-7D and UFMG-CM-Y259, which is in line with the fact that whereas the CEN.PK113-7D strain grows faster on glucose than on sucrose, the opposite is observed for the UFMG-CM-Y259 strain.
Collapse
Affiliation(s)
- Carla Inês Soares Rodrigues
- Department of Biotechnology, Delft University of Technology, van der Maasweg 9, 2629 HZ, Delft, The Netherlands.,School of Food Engineering, University of Campinas, Rua Monteiro Lobato 80, Campinas, SP, 13083-862, Brazil.,Cargill R&D Centre Europe, Havenstraat 84, 1800, Vilvoorde, Belgium.,DAB.bio, Alexander Fleminglaan 1, 2613 AX, Delft, The Netherlands
| | - Maxime den Ridder
- Department of Biotechnology, Delft University of Technology, van der Maasweg 9, 2629 HZ, Delft, The Netherlands
| | - Martin Pabst
- Department of Biotechnology, Delft University of Technology, van der Maasweg 9, 2629 HZ, Delft, The Netherlands
| | - Andreas K Gombert
- School of Food Engineering, University of Campinas, Rua Monteiro Lobato 80, Campinas, SP, 13083-862, Brazil
| | - Sebastian Aljoscha Wahl
- Department of Biotechnology, Delft University of Technology, van der Maasweg 9, 2629 HZ, Delft, The Netherlands. .,Lehrstuhl für Bioverfahrenstechnik, Friedrich-Alexander Universität Erlangen-Nürnberg, Paul-Gordan-Str. 3-5, 91052, Erlangen, Germany.
| |
Collapse
|
4
|
Kruasuwan W, Puseenam A, Am-in S, Trakarnpaiboon S, Sornlek W, Kocharin K, Jindamorakot S, Tanapongpipat S, Bai FY, Roongsawang N. Evaluation of thermotolerant and ethanol-tolerant Saccharomyces cerevisiae as an alternative strain for bioethanol production from industrial feedstocks. 3 Biotech 2023; 13:23. [PMID: 36573155 PMCID: PMC9789288 DOI: 10.1007/s13205-022-03436-4] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/08/2022] [Accepted: 11/26/2022] [Indexed: 12/25/2022] Open
Abstract
Despite the fact that yeast Saccharomyces cerevisiae is by far the most commonly used in ethanol fermentation, few have been reported to be resistant to high ethanol concentrations at high temperatures. Hence, in this study, 150 S. cerevisiae strains from the Thailand Bioresource Research Center (TBRC) were screened for ethanol production based on their glucose utilization capability at high temperatures. Four strains, TBRC 12149, 12150, 12151, and 12153, exhibited the most outstanding ethanol production at high temperatures in shaking-flask culture. Among these, strain TBRC 12151 demonstrated a high ethanol tolerance of up to 12% at 40 °C. Compared to industrial and laboratory strains, TBRC 12149 displayed strong sucrose fermentation capacity whereas TBRC 12153 and 12151, respectively, showed the greatest ethanol production from molasses and cassava starch hydrolysate at high temperatures in shaking-flask conditions. In 5-L batch fermentation, similarly to both industrial strains, strain TBRC 12153 yielded an ethanol concentration of 66.5 g L-1 (58.4% theoretical yield) from molasses after 72 h at 40 °C. In contrast, strain TBRC12151 outperformed other industrial strains in cell growth and ethanol production from cassava starch hydrolysis at 40 °C with an ethanol production of 65 g L-1 (77.7% theoretical yield) after 72 h. Thus, the thermotolerant and ethanol-tolerant S. cerevisiae TBRC 12151 displayed great potential and possible uses as an alternative strain for industrial ethanol fermentation using cassava starch hydrolysate. Supplementary Information The online version contains supplementary material available at 10.1007/s13205-022-03436-4.
Collapse
Affiliation(s)
- Worarat Kruasuwan
- Microbial Cell Factory Research Team, Biorefinery and Bioproduct Technology Research Group, National Center for Genetic Engineering and Biotechnology, National Science and Technology Development Agency, 113 Thailand Science Park, Khlong Nueng, Khlong Luang, 12120 Pathum Thani Thailand
- Present Address: Siriraj Long-Read Laboratory (Si-LoL), Division of Medical Bioinformatics, Research Department, Faculty of Medicine Siriraj Hospital, Mahidol University, Bangkok, 10700 Thailand
| | - Aekkachai Puseenam
- Microbial Cell Factory Research Team, Biorefinery and Bioproduct Technology Research Group, National Center for Genetic Engineering and Biotechnology, National Science and Technology Development Agency, 113 Thailand Science Park, Khlong Nueng, Khlong Luang, 12120 Pathum Thani Thailand
| | - Somjit Am-in
- Microbial Diversity and Utilization Research Team, Thailand Bioresource Research Center, National Center for Genetic Engineering and Biotechnology, National Science and Technology Development Agency, 113 Thailand Science Park, Khlong Nueng, Khlong Luang, 12120 Pathum Thani Thailand
| | - Srisakul Trakarnpaiboon
- Enzyme Technology Research Team, Biorefinery and Bioproduct Technology Research Group, National Center for Genetic Engineering and Biotechnology, National Science and Technology Development Agency, 113 Thailand Science Park, Khlong Nueng, Khlong Luang, 12120 Pathum Thani Thailand
| | - Warasirin Sornlek
- Enzyme Technology Research Team, Biorefinery and Bioproduct Technology Research Group, National Center for Genetic Engineering and Biotechnology, National Science and Technology Development Agency, 113 Thailand Science Park, Khlong Nueng, Khlong Luang, 12120 Pathum Thani Thailand
| | - Kanokarn Kocharin
- Microbial Cell Factory Research Team, Biorefinery and Bioproduct Technology Research Group, National Center for Genetic Engineering and Biotechnology, National Science and Technology Development Agency, 113 Thailand Science Park, Khlong Nueng, Khlong Luang, 12120 Pathum Thani Thailand
| | - Sasitorn Jindamorakot
- Microbial Diversity and Utilization Research Team, Thailand Bioresource Research Center, National Center for Genetic Engineering and Biotechnology, National Science and Technology Development Agency, 113 Thailand Science Park, Khlong Nueng, Khlong Luang, 12120 Pathum Thani Thailand
| | - Sutipa Tanapongpipat
- Microbial Cell Factory Research Team, Biorefinery and Bioproduct Technology Research Group, National Center for Genetic Engineering and Biotechnology, National Science and Technology Development Agency, 113 Thailand Science Park, Khlong Nueng, Khlong Luang, 12120 Pathum Thani Thailand
| | - Feng-Yan Bai
- State Key Laboratory of Mycology, Institute of Microbiology, Chinese Academy of Sciences, Beijing, 100101 China
| | - Niran Roongsawang
- Microbial Cell Factory Research Team, Biorefinery and Bioproduct Technology Research Group, National Center for Genetic Engineering and Biotechnology, National Science and Technology Development Agency, 113 Thailand Science Park, Khlong Nueng, Khlong Luang, 12120 Pathum Thani Thailand
| |
Collapse
|
5
|
Current Ethanol Production Requirements for the Yeast Saccharomyces cerevisiae. Int J Microbiol 2022; 2022:7878830. [PMID: 35996633 PMCID: PMC9392646 DOI: 10.1155/2022/7878830] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/09/2021] [Revised: 06/28/2022] [Accepted: 07/12/2022] [Indexed: 11/17/2022] Open
Abstract
An increase in global energy demand has caused oil prices to reach record levels in recent times. High oil prices together with concerns over CO2 emissions have resulted in renewed interest in renewable energy. Nowadays, ethanol is the principal renewable biofuel. However, the industrial need for increased productivity, wider substrate range utilization, and the production of novel compounds leads to renewed interest in further extending the use of current industrial strains by exploiting the immense, and still unknown, potential of natural yeast strains. This review seeks to answer the following questions: (a) which characteristics should S. cerevisiae have for the current production of first- and second-generation ethanol? (b) Why are alcohol-tolerance and thermo-tolerance characteristics required? (c) Which genes are related to these characteristics? (d) What are the advances that can be achieved with the isolation of new organisms from the environment?
Collapse
|
6
|
Genotypic and phenotypic characterization of industrial autochthonous Saccharomyces cerevisiae for the selection of well-adapted bioethanol-producing strains. Fungal Biol 2022; 126:658-673. [DOI: 10.1016/j.funbio.2022.08.004] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/05/2022] [Revised: 07/28/2022] [Accepted: 08/09/2022] [Indexed: 11/17/2022]
|
7
|
Mining transcriptomic data to identify Saccharomyces cerevisiae signatures related to improved and repressed ethanol production under fermentation. PLoS One 2022; 17:e0259476. [PMID: 35881609 PMCID: PMC9321456 DOI: 10.1371/journal.pone.0259476] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/13/2021] [Accepted: 07/12/2022] [Indexed: 11/19/2022] Open
Abstract
Saccharomyces cerevisiae is known for its outstanding ability to produce ethanol in industry. Underlying the dynamics of gene expression in S. cerevisiae in response to fermentation could provide informative results, required for the establishment of any ethanol production improvement program. Thus, representing a new approach, this study was conducted to identify the discriminative genes between improved and repressed ethanol production as well as clarifying the molecular responses to this process through mining the transcriptomic data. The significant differential expression probe sets were extracted from available microarray datasets related to yeast fermentation performance. To identify the most effective probe sets contributing to discriminate ethanol content, 11 machine learning algorithms from RapidMiner were employed. Further analysis including pathway enrichment and regulatory analysis were performed on discriminative probe sets. Besides, the decision tree models were constructed, the performance of each model was evaluated and the roots were identified. Based on the results, 171 probe sets were identified by at least 5 attribute weighting algorithms (AWAs) and 17 roots were recognized with 100% performance Some of the top ranked presets were found to be involved in carbohydrate metabolism, oxidative phosphorylation, and ethanol fermentation. Principal component analysis (PCA) and heatmap clustering validated the top-ranked selective probe sets. In addition, the top-ranked genes were validated based on GSE78759 and GSE5185 dataset. From all discriminative probe sets, OLI1 and CYC3 were identified as the roots with the best performance, demonstrated by the most weighting algorithms and linked to top two significant enriched pathways including porphyrin biosynthesis and oxidative phosphorylation. ADH5 and PDA1 were also recognized as differential top-ranked genes that contribute to ethanol production. According to the regulatory clustering analysis, Tup1 has a significant effect on the top-ranked target genes CYC3 and ADH5 genes. This study provides a basic understanding of the S. cerevisiae cell molecular mechanism and responses to two different medium conditions (Mg2+ and Cu2+) during the fermentation process.
Collapse
|
8
|
High Foam Phenotypic Diversity and Variability in Flocculant Gene Observed for Various Yeast Cell Surfaces Present as Industrial Contaminants. FERMENTATION-BASEL 2021. [DOI: 10.3390/fermentation7030127] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/30/2022]
Abstract
Many contaminant yeast strains that survive inside fuel ethanol industrial vats show detrimental cell surface phenotypes. These harmful effects may include filamentation, invasive growth, flocculation, biofilm formation, and excessive foam production. Previous studies have linked some of these phenotypes to the expression of FLO genes, and the presence of gene length polymorphisms causing the expansion of FLO gene size appears to result in stronger flocculation and biofilm formation phenotypes. We performed here a molecular analysis of FLO1 and FLO11 gene polymorphisms present in contaminant strains of Saccharomyces cerevisiae from Brazilian fuel ethanol distilleries showing vigorous foaming phenotypes during fermentation. The size variability of these genes was correlated with cellular hydrophobicity, flocculation, and highly foaming phenotypes in these yeast strains. Our results also showed that deleting the primary activator of FLO genes (the FLO8 gene) from the genome of a contaminant and highly foaming industrial strain avoids complex foam formation, flocculation, invasive growth, and biofilm production by the engineered (flo8∆::BleR/flo8Δ::kanMX) yeast strain. Thus, the characterization of highly foaming yeasts and the influence of FLO8 in this phenotype open new perspectives for yeast strain engineering and optimization in the sugarcane fuel-ethanol industry.
Collapse
|
9
|
Rodrigues CIS, Wahl A, Gombert AK. Aerobic growth physiology of Saccharomyces cerevisiae on sucrose is strain-dependent. FEMS Yeast Res 2021; 21:6214418. [PMID: 33826723 DOI: 10.1093/femsyr/foab021] [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: 10/26/2020] [Accepted: 04/01/2021] [Indexed: 12/22/2022] Open
Abstract
Present knowledge on the quantitative aerobic physiology of the yeast Saccharomyces cerevisiae during growth on sucrose as sole carbon and energy source is limited to either adapted cells or to the model laboratory strain CEN.PK113-7D. To broaden our understanding of this matter and open novel opportunities for sucrose-based biotechnological processes, we characterized three strains, with distinct backgrounds, during aerobic batch bioreactor cultivations. Our results reveal that sucrose metabolism in S. cerevisiae is a strain-specific trait. Each strain displayed distinct extracellular hexose concentrations and invertase activity profiles. Especially, the inferior maximum specific growth rate (0.21 h-1) of the CEN.PK113-7D strain, with respect to that of strains UFMG-CM-Y259 (0.37 h-1) and JP1 (0.32 h-1), could be associated to its low invertase activity (0.04-0.09 U/mgDM). Moreover, comparative experiments with glucose or fructose alone, or in combination, suggest mixed mechanisms of sucrose utilization by the industrial strain JP1, and points out the remarkable ability of the wild isolate UFMG-CM-259 to grow faster on sucrose than on glucose in a well-controlled cultivation system. This work hints to a series of metabolic traits that can be exploited to increase sucrose catabolic rates and bioprocess efficiency.
Collapse
Affiliation(s)
- Carla Inês Soares Rodrigues
- School of Food Engineering, University of Campinas, Rua Monteiro Lobato 80, 13083-862, Campinas, SP, Brazil.,Department of Biotechnology, Delft University of Technology, Van der Maasweg 9, 2629HZ Delft, The Netherlands
| | - Aljoscha Wahl
- Department of Biotechnology, Delft University of Technology, Van der Maasweg 9, 2629HZ Delft, The Netherlands
| | - Andreas K Gombert
- School of Food Engineering, University of Campinas, Rua Monteiro Lobato 80, 13083-862, Campinas, SP, Brazil
| |
Collapse
|
10
|
Variable and dose-dependent response of Saccharomyces and non-Saccharomyces yeasts toward lignocellulosic hydrolysate inhibitors. Braz J Microbiol 2021; 52:575-586. [PMID: 33825150 DOI: 10.1007/s42770-021-00489-0] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/24/2020] [Accepted: 03/29/2021] [Indexed: 10/21/2022] Open
Abstract
Lignocellulosic hydrolysates will also contain compounds that inhibit microbial metabolism, such as organic acids, furaldehydes, and phenolic compounds. Understanding the response of yeasts toward such inhibitors is important to the development of different bioprocesses. In this work, the growth capacity of 7 industrial Saccharomyces cerevisiae and 7 non-Saccharomyces yeasts was compared in the presence of 3 different concentrations of furaldehydes (furfural and 5-hydroxymetil-furfural), organic acids (acetic and formic acids), and phenolic compounds (vanillin, syringaldehyde, ferulic, and coumaric acids). Then, Candida tropicalis JA2, Meyerozyma caribbica JA9, Wickerhamomyces anomalus 740, S. cerevisiae JP1, B1.1, and G06 were selected for fermentation in presence of acetic acid, HMF, and vanillin because they proved to be most tolerant to the tested compounds, while Spathaspora sp. JA1 because its xylose consumption rate. The results obtained showed a dose-dependent response of the yeasts toward the eight different inhibitors. Among the compared yeasts, S. cerevisiae strains presented higher tolerance than non-Saccharomyces, 3 of them with the highest tolerance among all. Regarding the non-Saccharomyces yeasts, C. tropicalis JA2 and W. anomalus 740 appeared as the most tolerant, whereas Spathaspora strains appeared very sensitive to the different compounds.
Collapse
|
11
|
Online monitoring of the morphology of an industrial sugarcane biofuel yeast strain via in situ microscopy. J Microbiol Methods 2020; 175:105973. [DOI: 10.1016/j.mimet.2020.105973] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/01/2020] [Revised: 06/03/2020] [Accepted: 06/04/2020] [Indexed: 12/15/2022]
|
12
|
da Silva JM, da Silva GHTG, Parente DC, Leite FCB, Silva CS, Valente P, Ganga AM, Simões DA, de Morais MA. Biological diversity of carbon assimilation among isolates of the yeast Dekkera bruxellensis from wine and fuel-ethanol industrial processes. FEMS Yeast Res 2019; 19:5372417. [PMID: 30848782 DOI: 10.1093/femsyr/foz022] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/23/2018] [Accepted: 03/07/2019] [Indexed: 12/11/2022] Open
Abstract
Dekkera bruxellensis is considered a spoilage yeast in winemaking, brewing and fuel-ethanol production. However, there is growing evidence in the literature of its biotechnological potential. In this work, we surveyed 29 D. bruxellensis isolates from three countries and two different industrial origins (winemaking and fuel-ethanol production) for the metabolization of industrially relevant sugars. The isolates were characterized by the determination of their maximum specific growth rates, and by testing their ability to grow in the presence of 2-deoxy-d-glucose and antimycin A. Great diversity was observed among the isolates, with fuel-ethanol isolates showing overall higher specific growth rates than wine isolates. Preferences for galactose (three wine isolates) and for cellobiose or lactose (some fuel-ethanol isolates) were observed. Fuel-ethanol isolates were less sensitive than wine isolates to glucose catabolite repression (GCR) induction by 2-deoxy-d-glucose. In strictly anaerobic conditions, isolates selected for having high aerobic growth rates were able to ferment glucose, sucrose and cellobiose at fairly high rates without supplementation of casamino acids or yeast extract in the culture medium. The phenotypic diversity found among wine and fuel-ethanol isolates suggests adaptation to these environments. A possible application of some of the GCR-insensitive, fast-growing isolates in industrial processes requiring co-assimilation of different sugars is considered.
Collapse
Affiliation(s)
- Jackeline Maria da Silva
- Department of Genetics, Federal University of Pernambuco, Recife, Brazil.,Department of Biochemistry, Federal University of Pernambuco, Recife, Brazil
| | | | - Denise Castro Parente
- Department of Genetics, Federal University of Pernambuco, Recife, Brazil.,Department of Biochemistry, Federal University of Pernambuco, Recife, Brazil
| | | | - Carolina Santos Silva
- Department of Chemical Engineering, Federal University of Pernambuco, Recife, Brazil
| | - Patrícia Valente
- Department of Microbiology, Immunology and Parasitology, Federal University of Rio Grande do Sul, Porto Alegre, Brazil
| | | | | | | |
Collapse
|
13
|
Favaro L, Jansen T, van Zyl WH. Exploring industrial and naturalSaccharomyces cerevisiaestrains for the bio-based economy from biomass: the case of bioethanol. Crit Rev Biotechnol 2019; 39:800-816. [DOI: 10.1080/07388551.2019.1619157] [Citation(s) in RCA: 46] [Impact Index Per Article: 9.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
Affiliation(s)
- Lorenzo Favaro
- Department of Agronomy Food Natural resources Animals and Environment (DAFNAE), University of Padova, Legnaro, Italy
| | - Trudy Jansen
- Department of Microbiology, Stellenbosch University, Stellenbosch, South Africa
| | | |
Collapse
|
14
|
The biotechnological potential of the yeast Dekkera bruxellensis. World J Microbiol Biotechnol 2019; 35:103. [PMID: 31236799 DOI: 10.1007/s11274-019-2678-x] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/17/2019] [Accepted: 06/15/2019] [Indexed: 10/26/2022]
Abstract
Dekkera bruxellensis is an industrial yeast mainly regarded as a contaminant species in fermentation processes. In winemaking, it is associated with off-flavours that cause wine spoilage, while in bioethanol production this yeast is linked to a reduction of industrial productivity by competing with Saccharomyces cerevisiae for the substrate. In spite of that, this point of view is gradually changing, mostly because D. bruxellensis is also able to produce important metabolites, such as ethanol, acetate, fusel alcohols, esters and others. This dual role is likely due to the fact that this yeast presents a set of metabolic traits that might be either industrially attractive or detrimental, depending on how they are faced and explored. Therefore, a proper industrial application for D. bruxellensis depends on the correct assembly of its central metabolic puzzle. In this sense, researchers have addressed issues regarding the physiological and genetic aspects of D. bruxellensis, which have brought to light much of our current knowledge on this yeast. In this review, we shall outline what is presently understood about the main metabolic features of D. bruxellensis and how they might be managed to improve its current or future industrial applications (except for winemaking, in which it is solely regarded as a contaminant). Moreover, we will discuss the advantages and challenges that must be overcome in order to take advantage of the full biotechnological potential of this yeast.
Collapse
|
15
|
Selection of Saccharomyces cerevisiae isolates for ethanol production in the presence of inhibitors. 3 Biotech 2019; 9:6. [PMID: 30622844 DOI: 10.1007/s13205-018-1541-3] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/31/2018] [Accepted: 12/16/2018] [Indexed: 12/29/2022] Open
Abstract
Eight yeast isolates identified as Saccharomyces cerevisiae were recovered from molasses-using Cuban distilleries and discriminated by nucleotide sequence analysis of ITS locus. The isolates L/25-7-81 and L/25-7-86 showed the highest ethanol yield from sugarcane juice, while L/25-7-12 and L/25-7-79 showed high ethanol yield from sugarcane molasses. The isolate L/25-7-86 also displayed high fermentation capacity when molasses was diluted with vinasse. In addition, stress tolerance was evaluated on the basis of growth in the presence of inhibitors (acetic acid, lactic acid, 5-hydroxymethylfurfural and sulfuric acid) and the results indicated that L/25-7-77 and L/25-7-79 congregated the highest score for cross-tolerance and fermentation capacity. Hence, these isolates, especially L/25-7-77, could serve as potential biological platform for the arduous task of fermenting complex substrates that contain inhibitors. The use of these yeasts was discussed in the context of second-generation ethanol and the environmental and economic implications of the use of vinasse, saving the use of water for substrate dilution.
Collapse
|
16
|
Aldrete-Tapia A, Martínez-Peniche R, Miranda-Castilleja D, Hernández-Iturriaga M. Saccharomyces cerevisiaeassociated with the spontaneous fermentation of tequila agave juice. JOURNAL OF THE INSTITUTE OF BREWING 2018. [DOI: 10.1002/jib.499] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Affiliation(s)
- A. Aldrete-Tapia
- Programa de Posgrado de Alimentos del Centro de la República (PROPAC), Facultad de Química; Universidad Autónoma de Querétaro; Cerro de las Campanas s/n Col. Las Campanas C.P. 76010 Querétaro Querétaro México
| | - R. Martínez-Peniche
- Programa de Posgrado de Alimentos del Centro de la República (PROPAC), Facultad de Química; Universidad Autónoma de Querétaro; Cerro de las Campanas s/n Col. Las Campanas C.P. 76010 Querétaro Querétaro México
| | - D. Miranda-Castilleja
- Programa de Posgrado de Alimentos del Centro de la República (PROPAC), Facultad de Química; Universidad Autónoma de Querétaro; Cerro de las Campanas s/n Col. Las Campanas C.P. 76010 Querétaro Querétaro México
| | - M. Hernández-Iturriaga
- Programa de Posgrado de Alimentos del Centro de la República (PROPAC), Facultad de Química; Universidad Autónoma de Querétaro; Cerro de las Campanas s/n Col. Las Campanas C.P. 76010 Querétaro Querétaro México
| |
Collapse
|
17
|
Paulino de Souza J, Dias do Prado C, Eleutherio EC, Bonatto D, Malavazi I, Ferreira da Cunha A. Improvement of Brazilian bioethanol production – Challenges and perspectives on the identification and genetic modification of new strains of Saccharomyces cerevisiae yeasts isolated during ethanol process. Fungal Biol 2018; 122:583-591. [DOI: 10.1016/j.funbio.2017.12.006] [Citation(s) in RCA: 24] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/28/2017] [Revised: 12/07/2017] [Accepted: 12/09/2017] [Indexed: 10/18/2022]
|
18
|
de Paiva DP, Rocha TB, Rubini MR, Nicola AM, Reis VCB, Torres FAG, de Moraes LMP. A study on the use of strain-specific and homologous promoters for heterologous expression in industrial Saccharomyces cerevisiae strains. AMB Express 2018; 8:82. [PMID: 29785587 PMCID: PMC5962522 DOI: 10.1186/s13568-018-0613-4] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/31/2018] [Accepted: 05/12/2018] [Indexed: 02/08/2023] Open
Abstract
Polymorphism is well known in Saccharomyces cerevisiae strains used for different industrial applications, however little is known about its effects on promoter efficiency. In order to test this, five different promoters derived from an industrial and a laboratory (S288c) strain were used to drive the expression of eGFP reporter gene in both cells. The ADH1 promoter (PADH1) in particular, which showed more polymorphism among the promoters analyzed, also exhibited the highest differences in intracellular fluorescence production. This was further confirmed by Northern blot analysis. The same behavior was also observed when the gene coding for secreted α-amylase from Cryptococcus flavus was placed under the control of either PADH1. These results underline the importance of the careful choice of the source of the promoter to be used in industrial yeast strains for heterologous expression.
Collapse
|
19
|
Santana NB, Dias JCT, Rezende RP, Franco M, Oliveira LKS, Souza LO. Production of xylitol and bio-detoxification of cocoa pod husk hemicellulose hydrolysate by Candida boidinii XM02G. PLoS One 2018; 13:e0195206. [PMID: 29641547 PMCID: PMC5895003 DOI: 10.1371/journal.pone.0195206] [Citation(s) in RCA: 27] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/02/2017] [Accepted: 03/19/2018] [Indexed: 11/18/2022] Open
Abstract
The use of cocoa pod husk hemicellulose hydrolysate (CPHHH) was evaluated for the production of xylitol by Candida boidinii XM02G yeast isolated from soil of cocoa-growing areas and decaying bark, as an alternative means of reusing this type of waste. Xylitol was obtained in concentrations of 11.34 g.L-1, corresponding to a yield (Yp/s) of 0.52 g.g-1 with a fermentation efficiency (ε) of 56.6%. The yeast was tolerant to inhibitor compounds present in CPHHH without detoxification in different concentration factors, and was able to tolerate phenolic compounds at approximately 6 g.L-1. The yeast was also able to metabolize more than 99% (p/v) of furfural and hydroxymethylfurfural present in the non-detoxified CPHHH without extension of the cell-growth lag phase, showing the potential of this microorganism for the production of xylitol. The fermentation of cocoa pod husk hydrolysates appears to provide an alternative use which may reduce the impact generated by incorrect disposal of this waste.
Collapse
Affiliation(s)
- Nivio Batista Santana
- Department of Animal and Rural Technology, State University of Southwest Bahia (UESB), Itapetinga, Bahia, Brazil
| | - João Carlos Teixeira Dias
- Department of Exact and Technological Sciences, State University of Santa Cruz (UESC), Ilhéus, Bahia, Brazil
- * E-mail:
| | - Rachel Passos Rezende
- Department of Exact and Technological Sciences, State University of Santa Cruz (UESC), Ilhéus, Bahia, Brazil
| | - Marcelo Franco
- Department of Biological Sciences, State University of Santa Cruz (UESC), Ilhéus, Bahia, Brazil
| | | | - Lucas Oliveira Souza
- Postgraduate Program in Food Science and Engineering, State University of Southwest Bahia (UESB), Itapetinga, Bahia, Brazil
| |
Collapse
|
20
|
Mohd Azhar SH, Abdulla R, Jambo SA, Marbawi H, Gansau JA, Mohd Faik AA, Rodrigues KF. Yeasts in sustainable bioethanol production: A review. Biochem Biophys Rep 2017; 10:52-61. [PMID: 29114570 PMCID: PMC5637245 DOI: 10.1016/j.bbrep.2017.03.003] [Citation(s) in RCA: 173] [Impact Index Per Article: 24.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/04/2016] [Revised: 02/10/2017] [Accepted: 03/04/2017] [Indexed: 12/23/2022] Open
Abstract
Bioethanol has been identified as the mostly used biofuel worldwide since it significantly contributes to the reduction of crude oil consumption and environmental pollution. It can be produced from various types of feedstocks such as sucrose, starch, lignocellulosic and algal biomass through fermentation process by microorganisms. Compared to other types of microoganisms, yeasts especially Saccharomyces cerevisiae is the common microbes employed in ethanol production due to its high ethanol productivity, high ethanol tolerance and ability of fermenting wide range of sugars. However, there are some challenges in yeast fermentation which inhibit ethanol production such as high temperature, high ethanol concentration and the ability to ferment pentose sugars. Various types of yeast strains have been used in fermentation for ethanol production including hybrid, recombinant and wild-type yeasts. Yeasts can directly ferment simple sugars into ethanol while other type of feedstocks must be converted to fermentable sugars before it can be fermented to ethanol. The common processes involves in ethanol production are pretreatment, hydrolysis and fermentation. Production of bioethanol during fermentation depends on several factors such as temperature, sugar concentration, pH, fermentation time, agitation rate, and inoculum size. The efficiency and productivity of ethanol can be enhanced by immobilizing the yeast cells. This review highlights the different types of yeast strains, fermentation process, factors affecting bioethanol production and immobilization of yeasts for better bioethanol production.
Collapse
Affiliation(s)
- Siti Hajar Mohd Azhar
- Faculty of Science and Natural Resources, Universiti Malaysia Sabah, Jalan UMS, 88400 Kota Kinabalu, Sabah, Malaysia
| | - Rahmath Abdulla
- Faculty of Science and Natural Resources, Universiti Malaysia Sabah, Jalan UMS, 88400 Kota Kinabalu, Sabah, Malaysia
- Energy Research Unit, Universiti Malaysia Sabah, Jalan UMS, 88400 Kota Kinabalu, Sabah, Malaysia
| | - Siti Azmah Jambo
- Faculty of Science and Natural Resources, Universiti Malaysia Sabah, Jalan UMS, 88400 Kota Kinabalu, Sabah, Malaysia
| | - Hartinie Marbawi
- Faculty of Science and Natural Resources, Universiti Malaysia Sabah, Jalan UMS, 88400 Kota Kinabalu, Sabah, Malaysia
| | - Jualang Azlan Gansau
- Faculty of Science and Natural Resources, Universiti Malaysia Sabah, Jalan UMS, 88400 Kota Kinabalu, Sabah, Malaysia
| | - Ainol Azifa Mohd Faik
- Faculty of Science and Natural Resources, Universiti Malaysia Sabah, Jalan UMS, 88400 Kota Kinabalu, Sabah, Malaysia
| | - Kenneth Francis Rodrigues
- Biotechnology Research Institute, Universiti Malaysia Sabah, Jalan UMS, 88400 Kota Kinabalu, Sabah, Malaysia
| |
Collapse
|
21
|
Brexó RP, Sant'Ana ADS. Microbial interactions during sugar cane must fermentation for bioethanol production: does quorum sensing play a role? Crit Rev Biotechnol 2017; 38:231-244. [PMID: 28574287 DOI: 10.1080/07388551.2017.1332570] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
Abstract
Microbial interactions represent important modulatory role in the dynamics of biological processes. During bioethanol production from sugar cane must, the presence of lactic acid bacteria (LAB) and wild yeasts is inevitable as they originate from the raw material and industrial environment. Increasing the concentration of ethanol, organic acids, and other extracellular metabolites in the fermentation must are revealed as wise strategies for survival by certain microorganisms. Despite this, the co-existence of LAB and yeasts in the fermentation vat and production of compounds such as organic acids and other extracellular metabolites result in reduction in the final yield of the bioethanol production process. In addition to the competition for nutrients, reduction of cellular viability of yeast strain responsible for fermentation, flocculation, biofilm formation, and changes in cell morphology are listed as important factors for reductions in productivity. Although these consequences are scientifically well established, there is still a gap about the physiological and molecular mechanisms governing these interactions. This review aims to discuss the potential occurrence of quorum sensing mechanisms between bacteria (mainly LAB) and yeasts and to highlight how the understanding of such mechanisms can result in very relevant and useful tools to benefit the biofuels industry and other sectors of biotechnology in which bacteria and yeast may co-exist in fermentation processes.
Collapse
Affiliation(s)
- Ramon Peres Brexó
- a Department of Food Science, Faculty of Food Engineering , University of Campinas , Campinas , SP , Brazil
| | - Anderson de Souza Sant'Ana
- a Department of Food Science, Faculty of Food Engineering , University of Campinas , Campinas , SP , Brazil
| |
Collapse
|
22
|
Lopes ML, Paulillo SCDL, Godoy A, Cherubin RA, Lorenzi MS, Giometti FHC, Bernardino CD, Amorim Neto HBD, Amorim HVD. Ethanol production in Brazil: a bridge between science and industry. Braz J Microbiol 2016; 47 Suppl 1:64-76. [PMID: 27818090 PMCID: PMC5156502 DOI: 10.1016/j.bjm.2016.10.003] [Citation(s) in RCA: 104] [Impact Index Per Article: 13.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/08/2016] [Accepted: 10/05/2016] [Indexed: 12/13/2022] Open
Abstract
In the last 40 years, several scientific and technological advances in microbiology of the fermentation have greatly contributed to evolution of the ethanol industry in Brazil. These contributions have increased our view and comprehension about fermentations in the first and, more recently, second-generation ethanol. Nowadays, new technologies are available to produce ethanol from sugarcane, corn and other feedstocks, reducing the off-season period. Better control of fermentation conditions can reduce the stress conditions for yeast cells and contamination by bacteria and wild yeasts. There are great research opportunities in production processes of the first-generation ethanol regarding high-value added products, cost reduction and selection of new industrial yeast strains that are more robust and customized for each distillery. New technologies have also focused on the reduction of vinasse volumes by increasing the ethanol concentrations in wine during fermentation. Moreover, conversion of sugarcane biomass into fermentable sugars for second-generation ethanol production is a promising alternative to meet future demands of biofuel production in the country. However, building a bridge between science and industry requires investments in research, development and transfer of new technologies to the industry as well as specialized personnel to deal with new technological challenges.
Collapse
|
23
|
Beato FB, Bergdahl B, Rosa CA, Forster J, Gombert AK. Physiology of Saccharomyces cerevisiae strains isolated from Brazilian biomes: new insights into biodiversity and industrial applications. FEMS Yeast Res 2016; 16:fow076. [PMID: 27609600 DOI: 10.1093/femsyr/fow076] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 09/05/2016] [Indexed: 01/21/2023] Open
Abstract
Fourteen indigenous Saccharomyces cerevisiae strains isolated from the barks of three tree species located in the Atlantic Rain Forest and Cerrado biomes in Brazil were genetically and physiologically compared to laboratory strains and to strains from the Brazilian fuel ethanol industry. Although no clear correlation could be found either between phenotype and isolation spot or between phenotype and genomic lineage, a set of indigenous strains with superior industrially relevant traits over commonly known industrial and laboratory strains was identified: strain UFMG-CM-Y257 has a very high specific growth rate on sucrose (0.57 ± 0.02 h-1), high ethanol yield (1.65 ± 0.02 mol ethanol mol hexose equivalent-1), high ethanol productivity (0.19 ± 0.00 mol L-1 h-1), high tolerance to acetic acid (10 g L-1) and to high temperature (40°C). Strain UFMG-CM-Y260 displayed high ethanol yield (1.67 ± 0.13 mol ethanol mol hexose equivalent-1), high tolerance to ethanol and to low pH, a trait which is important for non-aseptic industrial processes. Strain UFMG-CM-Y267 showed high tolerance to acetic acid and to high temperature (40°C), which is of particular interest to second generation industrial processes.
Collapse
Affiliation(s)
- Felipe B Beato
- School of Food Engineering, University of Campinas, Rua Monteiro Lobato, 80, Campinas, São Paulo 13083862, Brazil The Novo Nordisk Foundation Center for Biosustainability, Technical University of Denmark, Hørsholm 2970, Denmark Department of Chemical Engineering, University of São Paulo, São Paulo 05434070, Brazil
| | - Basti Bergdahl
- The Novo Nordisk Foundation Center for Biosustainability, Technical University of Denmark, Hørsholm 2970, Denmark
| | - Carlos A Rosa
- Department of Microbiology, Federal University of Minas Gerais, Belo Horizonte, Minas Gerais 31270-901, Brazil
| | - Jochen Forster
- The Novo Nordisk Foundation Center for Biosustainability, Technical University of Denmark, Hørsholm 2970, Denmark
| | - Andreas K Gombert
- School of Food Engineering, University of Campinas, Rua Monteiro Lobato, 80, Campinas, São Paulo 13083862, Brazil Department of Chemical Engineering, University of São Paulo, São Paulo 05434070, Brazil
| |
Collapse
|
24
|
Canseco Grellet M, Castagnaro A, Dantur K, De Boeck G, Ahmed P, Cárdenas G, Welin B, Ruiz R. A modified indirect mathematical model for evaluation of ethanol production efficiency in industrial-scale continuous fermentation processes. J Appl Microbiol 2016; 121:1026-37. [DOI: 10.1111/jam.13240] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/29/2016] [Revised: 03/29/2016] [Accepted: 07/19/2016] [Indexed: 11/28/2022]
Affiliation(s)
- M.A. Canseco Grellet
- Instituto de Tecnología Agroindustrial del Noroeste Argentino (ITANOA); Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET); Estación Experimental Agroindustrial Obispo Colombres (EEAOC); Las Talitas Tucumán Argentina
| | - A. Castagnaro
- Instituto de Tecnología Agroindustrial del Noroeste Argentino (ITANOA); Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET); Estación Experimental Agroindustrial Obispo Colombres (EEAOC); Las Talitas Tucumán Argentina
| | - K.I. Dantur
- Instituto de Tecnología Agroindustrial del Noroeste Argentino (ITANOA); Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET); Estación Experimental Agroindustrial Obispo Colombres (EEAOC); Las Talitas Tucumán Argentina
| | - G. De Boeck
- Instituto de Tecnología Agroindustrial del Noroeste Argentino (ITANOA); Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET); Estación Experimental Agroindustrial Obispo Colombres (EEAOC); Las Talitas Tucumán Argentina
| | - P.M. Ahmed
- Instituto de Tecnología Agroindustrial del Noroeste Argentino (ITANOA); Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET); Estación Experimental Agroindustrial Obispo Colombres (EEAOC); Las Talitas Tucumán Argentina
| | - G.J. Cárdenas
- Instituto de Tecnología Agroindustrial del Noroeste Argentino (ITANOA); Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET); Estación Experimental Agroindustrial Obispo Colombres (EEAOC); Las Talitas Tucumán Argentina
| | - B. Welin
- Instituto de Tecnología Agroindustrial del Noroeste Argentino (ITANOA); Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET); Estación Experimental Agroindustrial Obispo Colombres (EEAOC); Las Talitas Tucumán Argentina
| | - R.M. Ruiz
- Instituto de Tecnología Agroindustrial del Noroeste Argentino (ITANOA); Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET); Estación Experimental Agroindustrial Obispo Colombres (EEAOC); Las Talitas Tucumán Argentina
| |
Collapse
|
25
|
Transcriptomic response of Saccharomyces cerevisiae for its adaptation to sulphuric acid-induced stress. Antonie van Leeuwenhoek 2015; 108:1147-60. [DOI: 10.1007/s10482-015-0568-2] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/25/2015] [Accepted: 08/20/2015] [Indexed: 01/13/2023]
|
26
|
New sources and methods to isolate vinasse-tolerant wild yeasts efficient in ethanol production. ANN MICROBIOL 2015. [DOI: 10.1007/s13213-015-1095-0] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022] Open
|
27
|
Della-Bianca BE, de Hulster E, Pronk JT, van Maris AJ, Gombert AK. Physiology of the fuel ethanol strainSaccharomyces cerevisiaePE-2 at low pH indicates a context-dependent performance relevant for industrial applications. FEMS Yeast Res 2014; 14:1196-205. [DOI: 10.1111/1567-1364.12217] [Citation(s) in RCA: 39] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/22/2014] [Revised: 09/04/2014] [Accepted: 09/23/2014] [Indexed: 12/27/2022] Open
Affiliation(s)
| | - Erik de Hulster
- Department of Biotechnology; Delft University of Technology; Delft The Netherlands
| | - Jack T. Pronk
- Department of Biotechnology; Delft University of Technology; Delft The Netherlands
| | | | - Andreas K. Gombert
- Department of Chemical Engineering; University of Sao Paulo; São Paulo-SP Brazil
| |
Collapse
|
28
|
Pereira LF, Lucatti E, Basso LC, de Morais MA. The fermentation of sugarcane molasses by Dekkera bruxellensis and the mobilization of reserve carbohydrates. Antonie van Leeuwenhoek 2013; 105:481-9. [PMID: 24370978 DOI: 10.1007/s10482-013-0100-5] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/07/2013] [Accepted: 12/12/2013] [Indexed: 01/13/2023]
Abstract
The yeast Dekkera bruxellensis is considered to be very well adapted to industrial environments, in Brazil, USA, Canada and European Countries, when different substrates are used in alcoholic fermentations. Our previous study described its fermentative profile with a sugarcane juice substrate. In this study, we have extended its physiological evaluation to fermentation situations by using sugarcane molasses as a substrate to replicate industrial working conditions. The results have confirmed the previous reports of the low capacity of D. bruxellensis cells to assimilate sucrose, which seems to be the main factor that can cause a bottleneck in its use as fermentative yeast. Furthermore, the cells of D. bruxellensis showed a tendency to deviate most of sugar available for biomass and organic acids (lactic and acetic) compared with Saccharomyces cerevisiae, when calculated on the basis of their respective yields. As well as this, the acetate production from molasses medium by both yeasts was in marked contrast with the previous data on sugarcane juice. Glycerol and ethanol production by D. bruxellensis cells achieved levels of 33 and 53 % of the S. cerevisiae, respectively. However, the ethanol yield was similar for both yeasts. It is worth noting that this yeast did not accumulate trehalose when the intracellular glycogen content was 30 % lower than in S. cerevisiae. The lack of trehalose did not affect yeast viability under fermentation conditions. Thus, the adaptive success of D. bruxellensis under industrial fermentation conditions seems to be unrelated to the production of these reserve carbohydrates.
Collapse
Affiliation(s)
- Luciana Filgueira Pereira
- Interdepartmental Research Group on Metabolic Engineering, Federal University of Pernambuco, Recife, Brazil
| | | | | | | |
Collapse
|
29
|
Stress tolerance and growth physiology of yeast strains from the Brazilian fuel ethanol industry. Antonie van Leeuwenhoek 2013; 104:1083-95. [DOI: 10.1007/s10482-013-0030-2] [Citation(s) in RCA: 34] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/21/2013] [Accepted: 09/05/2013] [Indexed: 10/26/2022]
|
30
|
Antonangelo ATBF, Alonso DP, Ribolla PEM, Colombi D. Microsatellite marker-based assessment of the biodiversity of native bioethanol yeast strains. Yeast 2013; 30:307-17. [DOI: 10.1002/yea.2964] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/13/2012] [Revised: 05/17/2013] [Accepted: 05/22/2013] [Indexed: 11/06/2022] Open
Affiliation(s)
- Ana Teresa B. F. Antonangelo
- Laboratório de Pesquisas e Análises Genéticas (PANGENE), Depto de Parasitologia; IBB-UNESP; Botucatu; SP; Brazil
| | - Diego P. Alonso
- Laboratório de Pesquisas e Análises Genéticas (PANGENE), Depto de Parasitologia; IBB-UNESP; Botucatu; SP; Brazil
| | | | | |
Collapse
|
31
|
Vidal EE, de Billerbeck GM, Simões DA, Schuler A, François JM, de Morais MA. Influence of nitrogen supply on the production of higher alcohols/esters and expression of flavour-related genes in cachaça fermentation. Food Chem 2013; 138:701-8. [DOI: 10.1016/j.foodchem.2012.10.147] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/25/2012] [Revised: 10/16/2012] [Accepted: 10/30/2012] [Indexed: 10/27/2022]
|
32
|
What do we know about the yeast strains from the Brazilian fuel ethanol industry? Appl Microbiol Biotechnol 2012; 97:979-91. [DOI: 10.1007/s00253-012-4631-x] [Citation(s) in RCA: 120] [Impact Index Per Article: 10.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/16/2012] [Revised: 11/28/2012] [Accepted: 11/30/2012] [Indexed: 02/07/2023]
|
33
|
Sànchez i Nogué V, Bettiga M, Gorwa-Grauslund MF. Isolation and characterization of a resident tolerant Saccharomyces cerevisiae strain from a spent sulfite liquor fermentation plant. AMB Express 2012; 2:68. [PMID: 23237549 PMCID: PMC3539867 DOI: 10.1186/2191-0855-2-68] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/09/2012] [Accepted: 12/04/2012] [Indexed: 11/10/2022] Open
Abstract
Spent Sulfite Liquor (SSL) from wood pulping facilities is a sugar rich effluent that can be used as feedstock for ethanol production. However, depending on the pulping process conditions, the release of monosaccharides also generates a range of compounds that negatively affect microbial fermentation. In the present study, we investigated whether endogenous yeasts in SSL-based ethanol plant could represent a source of Saccharomyces cerevisiae strains with a naturally acquired tolerance towards this inhibitory environment. Two isolation processes were performed, before and after the re-inoculation of the plant with a commercial baker's yeast strain. The isolates were clustered by DNA fingerprinting and a recurrent Saccharomyces cerevisiae strain, different from the inoculated commercial baker's yeast strain, was isolated. The strain, named TMB3720, flocculated heavily and presented high furaldehyde reductase activity. During fermentation of undiluted SSL, TMB3720 displayed a 4-fold higher ethanol production rate and 1.8-fold higher ethanol yield as compared to the commercial baker's yeast. Another non-Saccharomyces cerevisiae species, identified as the pentose utilizing Pichia galeiformis, was also recovered in the last tanks of the process where the hexose to pentose sugar ratio and the inhibitory pressure are expected to be the lowest.
Collapse
|
34
|
Leite FCB, Basso TO, Pita WDB, Gombert AK, Simões DA, de Morais MA. Quantitative aerobic physiology of the yeast Dekkera bruxellensis, a major contaminant in bioethanol production plants. FEMS Yeast Res 2012; 13:34-43. [PMID: 23078341 DOI: 10.1111/1567-1364.12007] [Citation(s) in RCA: 34] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/06/2011] [Revised: 08/07/2012] [Accepted: 09/07/2012] [Indexed: 12/01/2022] Open
Abstract
Dekkera bruxellensis has been described as the major contaminant yeast of industrial ethanol production, although little is known about its physiology. The aim of this study was to investigate the growth of this yeast in diverse carbon sources and involved conducting shake-flask and glucose- or sucrose-limited chemostats experiments, and from the chemostat data, the stoichiometry of biomass formation during aerobic growth was established. As a result of the shake-flask experiments with hexoses or disaccharides, the specific growth rates were calculated, and a different behavior in rich and mineral medium was observed concerning to profile of acetate and ethanol production. In C-limited chemostats conditions, the metabolism of this yeast was completely respiratory, and the biomass yields reached values of 0.62 gDW gS(-1) . In addition, glucose pulses were applied to the glucose- or sucrose-limited chemostats. These results showed that D. bruxellensis has a short-term Crabtree effect. While the glucose pulse was at the sucrose-limited chemostat, sucrose accumulated at the reactor, indicating the presence of a glucose repression mechanism in D. bruxellensis.
Collapse
|
35
|
Leite FCB, Dos Anjos RSG, Basilio ACM, Leal GFC, Simões DA, de Morais MA. Construction of integrative plasmids suitable for genetic modification of industrial strains of Saccharomyces cerevisiae. Plasmid 2012; 69:114-7. [PMID: 23041652 DOI: 10.1016/j.plasmid.2012.09.004] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/26/2010] [Revised: 09/20/2012] [Accepted: 09/24/2012] [Indexed: 12/13/2022]
Abstract
The development of efficient tools for genetic modification of industrial yeast strains is one of the challenges that face the use of recombinant cells in industrial processes. In this study, we examine how the construction of two complementary integrative vectors can fulfill the major requirements of industrial recombinant yeast strains: the use of lactose assimilation genes as a food-grade yeast selection marker, and a system of integration that does not leave hazardous genes in the host genome and involves minimal interference in the yeast physiology. The pFB plasmid set was constructed to co-integrate both LAC4-based and LAC12-based cassettes into the ribosomal DNA (rDNA) locus to allow yeast cells to be selected in lactose medium. This phenotype can also be used to trace the recombinant cells in the environment by simply being plated on X-gal medium. The excisable trait of the LAC12 marker allows the introduction of many different heterologous genes, and makes it possible to introduce a complete heterologous metabolic pathway. The cloned heterologous genes can be highly expressed under the strong and constitutive TPI1 gene promoter, which can be exchanged for easy digestion of enzymes if necessary. This platform was introduced into Saccharomyces cerevisiae JP1 industrial strain where a recombinant with high stability of markers was produced without any change in the yeast physiology. Thus, it proved to be an efficient tool for the genetic modification of industrial strains.
Collapse
|
36
|
Reis VCB, Nicola AM, de Souza Oliveira Neto O, Batista VDF, de Moraes LMP, Torres FAG. Genetic characterization and construction of an auxotrophic strain of Saccharomyces cerevisiae JP1, a Brazilian industrial yeast strain for bioethanol production. J Ind Microbiol Biotechnol 2012; 39:1673-83. [PMID: 22892884 DOI: 10.1007/s10295-012-1170-5] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/18/2012] [Accepted: 07/10/2012] [Indexed: 02/08/2023]
Abstract
Used for millennia to produce beverages and food, Saccharomyces cerevisiae also became a workhorse in the production of biofuels, most notably bioethanol. Yeast strains have acquired distinct characteristics that are the result of evolutionary adaptation to the stresses of industrial ethanol production. JP1 is a dominant industrial S. cerevisiae strain isolated from a sugarcane mill and is becoming increasingly popular for bioethanol production in Brazil. In this work, we carried out the genetic characterization of this strain and developed a set of tools to permit its genetic manipulation. Using flow cytometry, mating type, and sporulation analysis, we verified that JP1 is diploid and homothallic. Vectors with dominant selective markers for G418, hygromycin B, zeocin, and ρ-fluoro-DL-phenylalanine were used to successfully transform JP1 cells. Also, an auxotrophic ura3 mutant strain of JP1 was created by gene disruption using integration cassettes with dominant markers flanked by loxP sites. Marker excision was accomplished by the Cre/loxP system. The resulting auxotrophic strain was successfully transformed with an episomal vector that allowed green fluorescent protein expression.
Collapse
Affiliation(s)
- Viviane Castelo Branco Reis
- Centro de Biotecnologia Molecular, Instituto de Ciências Biológicas, Universidade de Brasília, Brasília, DF 70910-900, Brazil
| | | | | | | | | | | |
Collapse
|
37
|
de Lucena RM, Elsztein C, Simões DA, de Morais MA. Participation of CWI, HOG and Calcineurin pathways in the tolerance of Saccharomyces cerevisiae to low pH by inorganic acid. J Appl Microbiol 2012; 113:629-40. [PMID: 22702539 DOI: 10.1111/j.1365-2672.2012.05362.x] [Citation(s) in RCA: 32] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/03/2012] [Revised: 05/26/2012] [Accepted: 06/12/2012] [Indexed: 02/03/2023]
Abstract
AIMS The present work aimed at identifying the metabolic response to acid stress and the mechanisms that lead to cell tolerance and adaptation. METHODS AND RESULTS Two strategies were used: screening deletion mutants for cell growth at neutral and acid pH compared to wild type and measurement by qPCR of the expression of yeast genes involved in different pathways. CONCLUSIONS The results complement our previous findings and showed that the Cell Wall Integrity pathway is the main mechanism for cell tolerance to acid pH, and this damage triggers the protein kinase C (PKC) pathway mainly via the Wsc1p membrane sensor. In addition, cell wall injury might mimic the effects of high osmotic shock and activates the High Osmolarity Glycerol pathway, which amplifies the signal in the upper part of PKC pathway and leads to the activation of Ca(2+) channels by SLT2 overexpression and this Ca(2+) influx further activates calcineurin. Together, these mechanisms induce the expression of genes involved in cell cycle regulation and cell wall regeneration. SIGNIFICANCE AND IMPACT OF THE STUDY These interactions are responsible for long-term adaptation of yeast cells to the acidic environment, and the results could drive future work on the genetic modification of yeast strains for high tolerance to the stresses of the bioethanol fermentation process.
Collapse
Affiliation(s)
- R M de Lucena
- Interdepartmental Research Group in Metabolic Engineering, Federal University of Pernambuco, Recife, Brazil
| | | | | | | |
Collapse
|
38
|
Graves T, Narendranath N, Power R. Development of a “Stress Model” Fermentation System for Fuel Ethanol Yeast Strains. JOURNAL OF THE INSTITUTE OF BREWING 2012. [DOI: 10.1002/j.2050-0416.2007.tb00286.x] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
|
39
|
de Souza Liberal AT, Carazzolle MF, Pereira GA, Simões DA, de Morais MA. The yeast Dekkera bruxellensis genome contains two orthologs of the ARO10 gene encoding for phenylpyruvate decarboxylase. World J Microbiol Biotechnol 2012; 28:2473-8. [PMID: 22806152 DOI: 10.1007/s11274-012-1054-x] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/21/2011] [Accepted: 04/09/2012] [Indexed: 11/26/2022]
Abstract
The yeast Dekkera bruxellensis possesses important physiological traits that enable it to grow in industrial environments as either spoiling yeast of wine production or a fermenting strain used for lambic beer, or fermenting yeast in the bioethanol production process. In this work, in silico analysis of the Dekkera genome database allowed the identification of two paralogous genes encoding for phenylpyruvate decarboxylase (DbARO10) that represents a unique trait among the hemiascomycetes. The molecular analysis of the theoretical protein confirmed its protein identity. Upon cultivation of the cell in medium containing phenylpyruvate, both increases in gene expression and in phenylpyruvate decarboxylase activity were observed. Both genes were differentially expressed depending on the culture condition and the type of metabolism, which indicated the difference in the biological function of their corresponding proteins. The importance of the duplicated DbARO10 genes in the D. bruxellensis genome was discussed and represents the first effort to understand the production of flavor by this yeast.
Collapse
|
40
|
Pereira LF, Bassi APG, Avansini SH, Neto AGB, Brasileiro BTRV, Ceccato-Antonini SR, de Morais MA. The physiological characteristics of the yeast Dekkera bruxellensis in fully fermentative conditions with cell recycling and in mixed cultures with Saccharomyces cerevisiae. Antonie Van Leeuwenhoek 2011; 101:529-39. [PMID: 22041979 DOI: 10.1007/s10482-011-9662-2] [Citation(s) in RCA: 30] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/09/2011] [Accepted: 10/14/2011] [Indexed: 11/30/2022]
Abstract
The yeast Dekkera bruxellensis plays an important role in industrial fermentation processes, either as a contaminant or as a fermenting yeast. In this study, an analysis has been conducted of the fermentation characteristics of several industrial D. bruxellensis strains collected from distilleries from the Southeast and Northeast of Brazil, compared with Saccharomyces cerevisiae. It was found that all the strains of D. bruxellensis showed a lower fermentative capacity as a result of inefficient sugar assimilation, especially sucrose, under anaerobiosis, which is called the Custer effect. In addition, most of the sugar consumed by D. bruxellensis seemed to be used for biomass production, as was observed by the increase of its cell population during the fermentation recycles. In mixed populations, the surplus of D. bruxellensis over S. cerevisiae population could not be attributed to organic acid production by the first yeast, as previously suggested. Moreover, both yeast species showed similar sensitivity to lactic and acetic acids and were equally resistant to ethanol, when added exogenously to the fermentation medium. Thus, the effects that lead to the employment of D. bruxellensis in an industrial process and its effects on the production of ethanol are multivariate. The difficulty of using this yeast for ethanol production is that it requires the elimination of the Custer effect to allow an increase in the assimilation of sugar under anaerobic conditions.
Collapse
Affiliation(s)
- Luciana Filgueira Pereira
- Interdepartmental Research Group in Metabolic Engineering, Federal University of Pernambuco, Recife, PE, Brazil
| | | | | | | | | | | | | |
Collapse
|
41
|
Elsztein C, de Lucena RM, de Morais MA. The resistance of the yeast Saccharomyces cerevisiae to the biocide polyhexamethylene biguanide: involvement of cell wall integrity pathway and emerging role for YAP1. BMC Mol Biol 2011; 12:38. [PMID: 21854579 PMCID: PMC3175164 DOI: 10.1186/1471-2199-12-38] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/21/2011] [Accepted: 08/19/2011] [Indexed: 11/19/2022] Open
Abstract
Background Polyhexamethylene biguanide (PHMB) is an antiseptic polymer that is mainly used for cleaning hospitals and pools and combating Acantamoeba infection. Its fungicide activity was recently shown by its lethal effect on yeasts that contaminate the industrial ethanol process, and on the PE-2 strain of Saccharomyces cerevisiae, one of the main fermenting yeasts in Brazil. This pointed to the need to know the molecular mechanism that lay behind the cell resistance to this compound. In this study, we examined the factors involved in PHMB-cell interaction and the mechanisms that respond to the damage caused by this interaction. To achieve this, two research strategies were employed: the expression of some genes by RT-qPCR and the analysis of mutant strains. Results Cell Wall integrity (CWI) genes were induced in the PHMB-resistant Saccharomyces cerevisiae strain JP-1, although they are poorly expressed in the PHMB-sensitive Saccharomyces cerevisiae PE2 strain. This suggested that PHMB damages the glucan structure on the yeast cell wall. It was also confirmed by the observed sensitivity of the yeast deletion strains, Δslg1, Δrom2, Δmkk2, Δslt2, Δknr4, Δswi4 and Δswi4, which showed that the protein kinase C (PKC) regulatory mechanism is involved in the response and resistance to PHMB. The sensitivity of the Δhog1 mutant was also observed. Furthermore, the cytotoxicity assay and gene expression analysis showed that the part played by YAP1 and CTT1 genes in cell resistance to PHMB is unrelated to oxidative stress response. Thus, we suggested that Yap1p can play a role in cell wall maintenance by controlling the expression of the CWI genes. Conclusion The PHMB treatment of the yeast cells activates the PKC1/Slt2 (CWI) pathway. In addition, it is suggested that HOG1 and YAP1 can play a role in the regulation of CWI genes.
Collapse
Affiliation(s)
- Carolina Elsztein
- Interdepartmental Research Group in Metabolic Engineering, Av, Moraes Rego, 1235, Cidade Universitária, 50670-901, Recife, PE, Brazil
| | | | | |
Collapse
|
42
|
de Barros Pita W, Leite FCB, de Souza Liberal AT, Simões DA, de Morais MA. The ability to use nitrate confers advantage to Dekkera bruxellensis over S. cerevisiae and can explain its adaptation to industrial fermentation processes. Antonie van Leeuwenhoek 2011; 100:99-107. [PMID: 21350883 DOI: 10.1007/s10482-011-9568-z] [Citation(s) in RCA: 49] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/21/2010] [Accepted: 02/18/2011] [Indexed: 10/18/2022]
Abstract
The yeast Dekkera bruxellensis has been regarded as a contamination problem in industrial ethanol production because it can replace the originally inoculated Saccharomyces cerevisiae strains. The present study deals with the influence of nitrate on the relative competitiveness of D. bruxellensis and S. cerevisiae in sugar cane ethanol fermentations. The industrial strain D. bruxellensis GDB 248 showed higher growth rates than S. cerevisiae JP1 strain in mixed ammonia/nitrate media, and nitrate assimilation genes were only slightly repressed by ammonia. These characteristics rendered D. bruxellensis cells with an ability to overcome S. cerevisiae populations in both synthetic medium and in sugar cane juice. The results were corroborated by data from industrial fermentations that showed a correlation between high nitrate concentrations and high D. bruxellensis cell counts. Moreover, the presence of nitrate increased fermentation efficiency of D. bruxellensis cells in anaerobic conditions, which may explain the maintenance of ethanol production in the presence of D. bruxellensis in industrial processes. The presence of high levels of nitrate in sugar cane juice may be due to its inefficient conversion by plant metabolism in certain soil types and could explain the periodical episodes of D. bruxellensis colonization of Brazilian ethanol plants.
Collapse
Affiliation(s)
- Will de Barros Pita
- Interdepartmental Research Group on Metabolic Engineering, Federal University of Pernambuco, Recife, PE, Brazil
| | | | | | | | | |
Collapse
|
43
|
Lucena BTL, dos Santos BM, Moreira JL, Moreira APB, Nunes AC, Azevedo V, Miyoshi A, Thompson FL, de Morais MA. Diversity of lactic acid bacteria of the bioethanol process. BMC Microbiol 2010; 10:298. [PMID: 21092306 PMCID: PMC2999616 DOI: 10.1186/1471-2180-10-298] [Citation(s) in RCA: 81] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/31/2010] [Accepted: 11/23/2010] [Indexed: 12/04/2022] Open
Abstract
Background Bacteria may compete with yeast for nutrients during bioethanol production process, potentially causing economic losses. This is the first study aiming at the quantification and identification of Lactic Acid Bacteria (LAB) present in the bioethanol industrial processes in different distilleries of Brazil. Results A total of 489 LAB isolates were obtained from four distilleries in 2007 and 2008. The abundance of LAB in the fermentation tanks varied between 6.0 × 105 and 8.9 × 108 CFUs/mL. Crude sugar cane juice contained 7.4 × 107 to 6.0 × 108 LAB CFUs. Most of the LAB isolates belonged to the genus Lactobacillus according to rRNA operon enzyme restriction profiles. A variety of Lactobacillus species occurred throughout the bioethanol process, but the most frequently found species towards the end of the harvest season were L. fermentum and L. vini. The different rep-PCR patterns indicate the co-occurrence of distinct populations of the species L. fermentum and L. vini, suggesting a great intraspecific diversity. Representative isolates of both species had the ability to grow in medium containing up to 10% ethanol, suggesting selection of ethanol tolerant bacteria throughout the process. Conclusions This study served as a first survey of the LAB diversity in the bioethanol process in Brazil. The abundance and diversity of LAB suggest that they have a significant impact in the bioethanol process.
Collapse
Affiliation(s)
- Brigida T L Lucena
- Institute of Biology, Federal University of Rio de Janeiro, Rio de Janeiro, Brazil
| | | | | | | | | | | | | | | | | |
Collapse
|
44
|
De Melo H, Bonini B, Thevelein J, Simões D, Morais M. Physiological and molecular analysis of the stress response of
Saccharomyces cerevisiae
imposed by strong inorganic acid with implication to industrial fermentations. J Appl Microbiol 2010; 109:116-27. [PMID: 20002866 DOI: 10.1111/j.1365-2672.2009.04633.x] [Citation(s) in RCA: 40] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- H.F. De Melo
- Department of Genetics, Federal University of Pernambuco, Recife, Pernambuco, Brazil
| | - B.M. Bonini
- Laboratory of Molecular Cell Biology, Institute of Botany and Microbiology, Katholieke Universiteit Leuven, Leuven, Belgium
- Department of Molecular Microbiology, VIB, Leuven‐Heverlee, Flanders, Belgium
| | - J. Thevelein
- Laboratory of Molecular Cell Biology, Institute of Botany and Microbiology, Katholieke Universiteit Leuven, Leuven, Belgium
- Department of Molecular Microbiology, VIB, Leuven‐Heverlee, Flanders, Belgium
| | - D.A. Simões
- Department of Biochemistry, Federal University of Pernambuco, Recife, Pernambuco, Brazil
| | - M.A. Morais
- Department of Genetics, Federal University of Pernambuco, Recife, Pernambuco, Brazil
| |
Collapse
|
45
|
Nova MXV, Schuler ARP, Brasileiro BTRV, Morais MA. Yeast species involved in artisanal cachaça fermentation in three stills with different technological levels in Pernambuco, Brazil. Food Microbiol 2009; 26:460-6. [DOI: 10.1016/j.fm.2009.02.005] [Citation(s) in RCA: 24] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/26/2008] [Revised: 02/03/2009] [Accepted: 02/06/2009] [Indexed: 10/21/2022]
|
46
|
Study of sugarcane pieces as yeast supports for ethanol production from sugarcane juice and molasses. J Ind Microbiol Biotechnol 2008; 35:1605-13. [PMID: 18685877 DOI: 10.1007/s10295-008-0404-z] [Citation(s) in RCA: 40] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/21/2008] [Accepted: 07/23/2008] [Indexed: 10/21/2022]
Abstract
Due to the environmental concerns and the increasing price of oil, bioethanol was already produced in large amount in Brazil and China from sugarcane juice and molasses. In order to make this process competitive, we have investigated the suitability of immobilized Saccharomyces cerevisiae strain AS2.1190 on sugarcane pieces for production of ethanol. Electron microscopy clearly showed that cell immobilization resulted in firm adsorption of the yeast cells within subsurface cavities, capillary flow through the vessels of the vascular bundle structure, and attachment of the yeast to the surface of the sugarcane pieces. Repeated batch fermentations using sugarcane supported-biocatalyst were successfully carried out for at least ten times without any significant loss in ethanol production from sugarcane juice and molasses. The number of cells attached to the support increased during the fermentation process, and fewer yeast cells leaked into fermentation broth. Ethanol concentrations (about 89.73-77.13 g/l in average value), and ethanol productivities (about 59.53-62.79 g/l d in average value) were high and stable, and residual sugar concentrations were low in all fermentations (0.34-3.60 g/l) with conversions ranging from 97.67-99.80%, showing efficiency (90.11-94.28%) and operational stability of the biocatalyst for ethanol fermentation. The results of this study concerning the use of sugarcane as yeast supports could be promising for industrial fermentations.
Collapse
|
47
|
Fischer CR, Klein-Marcuschamer D, Stephanopoulos G. Selection and optimization of microbial hosts for biofuels production. Metab Eng 2008; 10:295-304. [PMID: 18655844 DOI: 10.1016/j.ymben.2008.06.009] [Citation(s) in RCA: 225] [Impact Index Per Article: 14.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/05/2008] [Accepted: 06/20/2008] [Indexed: 11/25/2022]
Abstract
Currently, the predominant microbially produced biofuel is starch- or sugar-derived ethanol. However, ethanol is not an ideal fuel molecule, and lignocellulosic feedstocks are considerably more abundant than both starch and sugar. Thus, many improvements in both the feedstock and the fuel have been proposed. In this paper, we examine the prospects for bioproduction of four second-generation biofuels (n-butanol, 2-butanol, terpenoids, or higher lipids) from four feedstocks (sugars and starches, lignocellulosics, syngas, and atmospheric carbon dioxide). The principal obstacle to commercial production of these fuels is that microbial catalysts of robust yields, productivities, and titers have yet to be developed. Suitable microbial hosts for biofuel production must tolerate process stresses such as end-product toxicity and tolerance to fermentation inhibitors in order to achieve high yields and titers. We tested seven fast-growing host organisms for tolerance to production stresses, and discuss several metabolic engineering strategies for the improvement of biofuels production.
Collapse
Affiliation(s)
- Curt R Fischer
- Department of Chemical Engineering, Massachusetts Institute of Technology, Room 56-469, Cambridge, MA 02139, USA
| | | | | |
Collapse
|
48
|
Polyhexamethyl biguanide can eliminate contaminant yeasts from fuel-ethanol fermentation process. J Ind Microbiol Biotechnol 2008; 35:967-73. [PMID: 18506496 DOI: 10.1007/s10295-008-0371-4] [Citation(s) in RCA: 15] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/14/2008] [Accepted: 05/12/2008] [Indexed: 10/22/2022]
Abstract
Industrial ethanol fermentation is a non-sterile process and contaminant microorganisms can lead to a decrease in industrial productivity and significant economic loss. Nowadays, some distilleries in Northeastern Brazil deal with bacterial contamination by decreasing must pH and adding bactericides. Alternatively, contamination can be challenged by adding a pure batch of Saccharomyces cerevisiae-a time-consuming and costly process. A better strategy might involve the development of a fungicide that kills contaminant yeasts while preserving S. cerevisiae cells. Here, we show that polyhexamethyl biguanide (PHMB) inhibits and kills the most important contaminant yeasts detected in the distilleries of Northeastern Brazil without affecting the cell viability and fermentation capacity of S. cerevisiae. Moreover, some physiological data suggest that PHMB acts through interaction with the yeast membrane. These results support the development of a new strategy for controlling contaminant yeast population whilst keeping industrial yields high.
Collapse
|
49
|
Basílio ACM, de Araújo PRL, de Morais JOF, da Silva Filho EA, de Morais MA, Simões DA. Detection and identification of wild yeast contaminants of the industrial fuel ethanol fermentation process. Curr Microbiol 2008; 56:322-6. [PMID: 18188645 DOI: 10.1007/s00284-007-9085-5] [Citation(s) in RCA: 70] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/24/2007] [Accepted: 10/06/2007] [Indexed: 11/26/2022]
Abstract
Monitoring for wild yeast contaminants is an essential component of the management of the industrial fuel ethanol manufacturing process. Here we describe the isolation and molecular identification of 24 yeast species present in bioethanol distilleries in northeast Brazil that use sugar cane juice or cane molasses as feeding substrate. Most of the yeast species could be identified readily from their unique amplification-specific polymerase chain reaction (PCR) fingerprint. Yeast of the species Dekkera bruxellensis, Candida tropicalis, Pichia galeiformis, as well as a species of Candida that belongs to the C. intermedia clade, were found to be involved in acute contamination episodes; the remaining 20 species were classified as adventitious. Additional physiologic data confirmed that the presence of these major contaminants cause decreased bioethanol yield. We conclude that PCR fingerprinting can be used in an industrial setting to monitor yeast population dynamics to early identify the presence of the most important contaminant yeasts.
Collapse
MESH Headings
- Brazil
- DNA, Fungal/chemistry
- DNA, Fungal/genetics
- DNA, Intergenic/genetics
- DNA, Ribosomal/chemistry
- DNA, Ribosomal/genetics
- Ethanol/metabolism
- Fermentation
- Genes, rRNA
- Industrial Microbiology
- Molasses/microbiology
- Molecular Sequence Data
- Phylogeny
- Polymerase Chain Reaction/methods
- RNA, Fungal/genetics
- RNA, Ribosomal/genetics
- RNA, Ribosomal, 5.8S/genetics
- Ribotyping
- Sequence Analysis, DNA
- Sucrose/metabolism
- Yeasts/classification
- Yeasts/isolation & purification
Collapse
Affiliation(s)
- A C M Basílio
- Departamento de Genética, Universidade Federal de Pernambuco, Recife, Brazil
| | | | | | | | | | | |
Collapse
|
50
|
Santos SKBD, Basílio ACM, Brasileiro BTRV, Simões DA, Silva-Filho EAD, de Morais M. Identification of yeasts within Saccharomyces sensu stricto complex by PCR-fingerprinting. World J Microbiol Biotechnol 2007. [DOI: 10.1007/s11274-007-9407-6] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
|