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Hernández-Vásquez CI, García-García JH, Pérez-Ortega ER, Martínez-Segundo AG, Damas-Buenrostro LC, Pereyra-Alférez B. Expression patterns of Mal genes and association with differential maltose and maltotriose transport rate of two Saccharomyces pastorianus yeasts. Appl Environ Microbiol 2024:e0039724. [PMID: 38975758 DOI: 10.1128/aem.00397-24] [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: 03/06/2024] [Accepted: 05/22/2024] [Indexed: 07/09/2024] Open
Abstract
Beer brewing is a well-known process that still faces great challenges, such as the total consumption of sugars present in the fermentation media. Lager-style beer, a major worldwide beer type, is elaborated by Saccharomyces pastorianus (Sp) yeast, which must ferment high maltotriose content worts, but its consumption represents a notable problem, especially among Sp strains belonging to group I. Factors, such as fermentation conditions, presence of maltotriose transporters, transporter copy number variation, and genetic regulation variations contribute to this issue. We assess the factors affecting fermentation in two Sp yeast strains: SpIB1, with limited maltotriose uptake, and SpIB2, known for efficient maltotriose transport. Here, SpIB2 transported significantly more maltose (28%) and maltotriose (32%) compared with SpIB1. Furthermore, SpIB2 expressed all MAL transporters (ScMALx1, SeMALx1, ScAGT1, SeAGT1, MTT1, and MPHx) on the first day of fermentation, whereas SpIB1 only exhibited ScMalx1, ScAGT1, and MPH2/3 genes. Some SpIB2 transporters had polymorphic transmembrane domains (TMD) resembling MTT1, accompanied by higher expression of these transporters and its positive regulator genes, such as MAL63. These findings suggest that, in addition to the factors mentioned above, positive regulators of Mal transporters contribute significantly to phenotypic diversity in maltose and maltotriose consumption among the studied lager yeast strains.IMPORTANCEBeer, the third most popular beverage globally with a 90% market share in the alcoholic beverage industry, relies on Saccharomyces pastorianus (Sp) strains for lager beer production. These strains exhibit phenotypic diversity in maltotriose consumption, a crucial process for the acceptable organoleptic profile in lager beer. This diversity ranges from Sp group II strains with a notable maltotriose-consuming ability to Sp group I strains with limited capacity. Our study highlights that differential gene expression of maltose and maltotriose transporters and its upstream trans-elements, such as MAL gene-positive regulators, adds complexity to this variation. This insight can contribute to a more comprehensive analysis needed to the development of controlled and efficient biotechnological processes in the beer brewing industry.
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Affiliation(s)
- César I Hernández-Vásquez
- Facultad de Ciencias Biológicas, Universidad Autónoma de Nuevo León, Instituto de Biotecnología, Nuevo León, Mexico
| | - Jorge H García-García
- Facultad de Ciencias Biológicas, Universidad Autónoma de Nuevo León, Instituto de Biotecnología, Nuevo León, Mexico
| | | | | | | | - Benito Pereyra-Alférez
- Facultad de Ciencias Biológicas, Universidad Autónoma de Nuevo León, Instituto de Biotecnología, Nuevo León, Mexico
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2
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Botman D, Kanagasabapathi S, Rep MI, van Rossum K, Tutucci E, Teusink B. cAMP in budding yeast: Also a messenger for sucrose metabolism? BIOCHIMICA ET BIOPHYSICA ACTA. MOLECULAR CELL RESEARCH 2024; 1871:119706. [PMID: 38521467 DOI: 10.1016/j.bbamcr.2024.119706] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/16/2023] [Revised: 02/28/2024] [Accepted: 03/04/2024] [Indexed: 03/25/2024]
Abstract
S. cerevisiae (or budding yeast) is an important micro-organism for sucrose-based fermentation in biotechnology. Yet, it is largely unknown how budding yeast adapts to sucrose transitions. Sucrose can only be metabolized when the invertase or the maltose machinery are expressed and we propose that the Gpr1p receptor signals extracellular sucrose availability via the cAMP peak to adapt cells accordingly. A transition to sucrose or glucose gave a transient cAMP peak which was maximally induced for sucrose. When transitioned to sucrose, cAMP signalling mutants showed an impaired cAMP peak together with a lower growth rate, a longer lag phase and a higher final OD600 compared to a glucose transition. These effects were not caused by altered activity or expression of enzymes involved in sucrose metabolism and imply a more general metabolic adaptation defect. Basal cAMP levels were comparable among the mutant strains, suggesting that the transient cAMP peak is required to adapt cells correctly to sucrose. We propose that the short-term dynamics of the cAMP signalling cascade detects long-term extracellular sucrose availability and speculate that its function is to maintain a fermentative phenotype at continuously low glucose and fructose concentrations.
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Affiliation(s)
- Dennis Botman
- Systems Biology Lab, AIMMS/ALIFE, Vrije Universiteit Amsterdam, 1081 HV Amsterdam, the Netherlands.
| | - Sineka Kanagasabapathi
- Systems Biology Lab, AIMMS/ALIFE, Vrije Universiteit Amsterdam, 1081 HV Amsterdam, the Netherlands
| | - Mila I Rep
- Systems Biology Lab, AIMMS/ALIFE, Vrije Universiteit Amsterdam, 1081 HV Amsterdam, the Netherlands
| | - Kelly van Rossum
- Systems Biology Lab, AIMMS/ALIFE, Vrije Universiteit Amsterdam, 1081 HV Amsterdam, the Netherlands
| | - Evelina Tutucci
- Systems Biology Lab, AIMMS/ALIFE, Vrije Universiteit Amsterdam, 1081 HV Amsterdam, the Netherlands
| | - Bas Teusink
- Systems Biology Lab, AIMMS/ALIFE, Vrije Universiteit Amsterdam, 1081 HV Amsterdam, the Netherlands.
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3
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Integrated bioinformatics, modelling, and gene expression analysis of the putative pentose transporter from Candida tropicalis during xylose fermentation with and without glucose addition. Appl Microbiol Biotechnol 2022; 106:4587-4606. [PMID: 35708749 DOI: 10.1007/s00253-022-12005-x] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/21/2021] [Revised: 05/18/2022] [Accepted: 05/27/2022] [Indexed: 11/02/2022]
Abstract
The transport of substrates across the cell membrane plays an essential role in nutrient assimilation by yeasts. The establishment of an efficient microbial cell factory, based on the maximum use of available carbon sources, can generate new technologies that allow the full use of lignocellulosic constituents. These technologies are of interest because they could promote the formation of added-value products with economic feasibility. In silico analyses were performed to investigate gene sequences capable of encoding xylose transporter proteins in the Candida tropicalis genome. The current study identified 11 putative transport proteins that have not yet been functionally characterized. A phylogenetic tree highlighted the potential C. tropicalis xylose-transporter proteins CtXUT1, CtXUT4, CtSTL1, CtSTL2, and CtGXT2, which were homologous to previously characterized and reported xylose transporters. Their expression was quantified through real-time qPCR at defined times, determined through a kinetic analysis of the microbial growth curve in the absence/presence of glucose supplemented with xylose as the main carbon source. The results indicated different mRNA expression levels for each gene. CtXUT1 mRNA expression was only found in the absence of glucose in the medium. Maximum CtXUT1 expression was observed in intervals of the highest xylose consumption (21 to 36 h) that corresponded to consumption rates of 1.02 and 0.82 g/L/h in the formulated media, with xylose as the only carbon source and with glucose addition. These observations indicate that CtXUT1 is an important xylose transporter in C. tropicalis. KEY POINTS: • Putative xylose transporter proteins were identified in Candida tropicalis; • The glucose concentration in the cultivation medium plays a key role in xylose transporter regulation; • The transporter gene CtXUT1 has an important role in xylose consumption by Candida tropicalis.
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4
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Pereira IDO, Dos Santos ÂA, Gonçalves DL, Purificação M, Guimarães NC, Tramontina R, Coutouné N, Zanella E, Matsushika A, Stambuk BU, Ienczak JL. Comparison of Spathaspora passalidarum and recombinant Saccharomyces cerevisiae for integration of first- and second-generation ethanol production. FEMS Yeast Res 2021; 21:6363686. [PMID: 34477865 DOI: 10.1093/femsyr/foab048] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/17/2021] [Accepted: 09/01/2021] [Indexed: 12/23/2022] Open
Abstract
First-generation ethanol (E1G) is based on the fermentation of sugars released from saccharine or starch sources, while second-generation ethanol (E2G) is focused on the fermentation of sugars released from lignocellulosic feedstocks. During the fractionation process to release sugars from hemicelluloses (mainly xylose), some inhibitor compounds are released hindering fermentation. Thus, the biggest challenge of using hemicellulosic hydrolysate is selecting strains and processes able to efficiently ferment xylose and tolerate inhibitors. With the aim of diluting inhibitors, sugarcane molasses (80% of sucrose content) can be mixed to hemicellulosic hydrolysate in an integrated E1G-E2G process. Cofermentations of xylose and sucrose were evaluated for the native xylose consumer Spathaspora passalidarum and a recombinant Saccharomyces cerevisiae strain. The industrial S. cerevisiae strain CAT-1 was modified to overexpress the XYL1, XYL2 and XKS1 genes and a mutant ([4-59Δ]HXT1) version of the low-affinity HXT1 permease, generating strain MP-C5H1. Although S. passalidarum showed better results for xylose fermentation, this yeast showed intracellular sucrose hydrolysis and low sucrose consumption in microaerobic conditions. Recombinant S. cerevisiae showed the best performance for cofermentation, and a batch strategy at high cell density in bioreactor achieved unprecedented results of ethanol yield, titer and volumetric productivity in E1G-E2G production process.
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Affiliation(s)
- Isabela de Oliveira Pereira
- Department of Chemical Engineering and Food Engineering, Federal University of Santa Catarina, Florianópolis, SC 88040-900, Brazil
| | - Ângela Alves Dos Santos
- Department of Biochemistry, Federal University of Santa Catarina, Florianópolis, SC 88040-900, Brazil
| | - Davi L Gonçalves
- Department of Biochemistry, Federal University of Santa Catarina, Florianópolis, SC 88040-900, Brazil
| | - Marcela Purificação
- Department of Biochemistry, Federal University of Santa Catarina, Florianópolis, SC 88040-900, Brazil
| | - Nick Candiotto Guimarães
- Department of Chemical Engineering and Food Engineering, Federal University of Santa Catarina, Florianópolis, SC 88040-900, Brazil
| | - Robson Tramontina
- Graduate Program in Biosciences and Technology of Bioactive Products, Institute of Biology, State University of Campinas (UNICAMP), Campinas, SP 13083-852, Brazil.,Brazilian Biorenewable Laboratory, National Center for Research in Energy and Materials, Campinas, SP 13083-100, Brazil
| | - Natalia Coutouné
- Brazilian Biorenewable Laboratory, National Center for Research in Energy and Materials, Campinas, SP 13083-100, Brazil.,Graduate Program in Genetics and Molecular Biology, Institute of Biology, State University of Campinas (UNICAMP), Campinas, SP 13083-852, Brazil
| | - Eduardo Zanella
- Department of Biochemistry, Federal University of Santa Catarina, Florianópolis, SC 88040-900, Brazil
| | - Akinori Matsushika
- Research Institute for Sustainable Chemistry, National Institute of Advanced Industrial Science and Technology, Higashi-Hiroshima, Hiroshima 739-0046, Japan.,Graduate School of Integrated Sciences for Life, Hiroshima University, Higashi-Hiroshima, Hiroshima 739-8530, Japan
| | - Boris U Stambuk
- Department of Biochemistry, Federal University of Santa Catarina, Florianópolis, SC 88040-900, Brazil
| | - Jaciane Lutz Ienczak
- Department of Chemical Engineering and Food Engineering, Federal University of Santa Catarina, Florianópolis, SC 88040-900, Brazil
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Costa ACT, Hornick J, Antunes TFS, Santos AMC, Fernandes AAR, Broach JR, Fernandes PMB. Complete genome sequence and analysis of a Saccharomyces cerevisiae strain used for sugarcane spirit production. Braz J Microbiol 2021; 52:1087-1095. [PMID: 33835421 DOI: 10.1007/s42770-021-00444-z] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/18/2020] [Accepted: 02/02/2021] [Indexed: 12/01/2022] Open
Abstract
Distillation of fermented sugarcane juice produces both rum and cachaça, significant sources of revenue in Brazil and elsewhere. In this study, we provide a genomic analysis of a Saccharomyces cerevisiae strain isolated from a cachaça distillery in Brazil. We determined the complete genome sequence of a strain with high flocculation capacity, high tolerance to ethanol, osmotic and heat shock stress and high fermentation rates and compared the sequence with that of the reference S288c genome as well as those of two other cachaça strains. Single-nucleotide polymorphism analysis identified alterations in genes involved in nitrogen and organic compound metabolism, integrity of organelles and ion homeostasis. The strain exhibited fragmentation of several flocculation genes relative to the reference genome, as well as loss of a stop codon in the FLO8 gene, which encodes a transcription factor required for FLO gene expression. The strain contained no genes not present in the reference genome strain but did lack several genes, including asparaginase genes, maltose utilization loci, and several genes from the tandem array of the DUP240 family. The three cachaça strains lacked different sets of genes, but the asparaginase genes and several of the DUP240 genes were common deficiencies. This study provides new insights regarding the selective pressure of sugarcane fermentation on the genome of yeast strains and offers additional genetic resources for modern synthetic biology and genome editing tools.
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Affiliation(s)
- Ane Catarine Tosi Costa
- Programa de Pós-Graduação em Biotecnologia, Universidade Federal do Espírito Santo, Vitoria, ES, 29040-090, Brazil
| | - Jacob Hornick
- Department of Biochemistry and Molecular Biology, Penn State University College of Medicine, 500 University Drive, Hershey, PA, 17033, USA
| | - Tathiana Ferreira Sá Antunes
- Programa de Pós-Graduação em Biotecnologia, Universidade Federal do Espírito Santo, Vitoria, ES, 29040-090, Brazil
| | | | - A Alberto R Fernandes
- Programa de Pós-Graduação em Biotecnologia, Universidade Federal do Espírito Santo, Vitoria, ES, 29040-090, Brazil
| | - James R Broach
- Department of Biochemistry and Molecular Biology, Penn State University College of Medicine, 500 University Drive, Hershey, PA, 17033, USA
| | - Patricia M B Fernandes
- Programa de Pós-Graduação em Biotecnologia, Universidade Federal do Espírito Santo, Vitoria, ES, 29040-090, Brazil.
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6
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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.
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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
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7
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Datamining and functional environmental genomics reassess the phylogenetics and functional diversity of fungal monosaccharide transporters. Appl Microbiol Biotechnol 2021; 105:647-660. [PMID: 33394157 DOI: 10.1007/s00253-020-11076-y] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/05/2020] [Revised: 12/14/2020] [Accepted: 12/23/2020] [Indexed: 10/22/2022]
Abstract
Sugar transporters are essential components of carbon metabolism and have been extensively studied to control sugar uptake by yeasts and filamentous fungi used in fermentation processes. Based on published information on characterized fungal sugar porters, we show that this protein family encompasses phylogenetically distinct clades. While several clades encompass transporters that seemingly specialized on specific "sugar-related" molecules (e.g., myo-inositol, charged sugar analogs), others include mostly either mono- or di/oligosaccharide low-specificity transporters. To address the issue of substrate specificity of sugar transporters, that protein primary sequences do not fully reveal, we screened "multi-species" soil eukaryotic cDNA libraries for mannose transporters, a sugar that had never been used to select transporters. We obtained 19 environmental transporters, mostly from Basidiomycota and Ascomycota. Among them, one belonged to the unusual "Fucose H+ Symporter" family, which is only known in Fungi for a rhamnose transporter in Aspergillus niger. Functional analysis of the 19 transporters by expression in yeast and for two of them in Xenopus laevis oocytes for electrophysiological measurements indicated that most of them showed a preference for D-mannose over other tested D-C6 (glucose, fructose, galactose) or D-C5 (xylose) sugars. For the several glucose and fructose-negative transporters, growth of the corresponding recombinant yeast strains was prevented on mannose in the presence of one of these sugars that may act by competition for the binding site. Our results highlight the potential of environmental genomics to figure out the functional diversity of key fungal protein families and that can be explored in a context of biotechnology. KEY POINTS: • Most fungal sugar transporters accept several sugars as substrates. • Transporters, belonging to 2 protein families, were isolated from soil cDNA libraries. • Environmental transporters featured novel substrate specificities.
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8
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Schematic overview of oligosaccharides, with survey on their major physiological effects and a focus on milk ones. CARBOHYDRATE POLYMER TECHNOLOGIES AND APPLICATIONS 2020. [DOI: 10.1016/j.carpta.2020.100013] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022] Open
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9
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Lopes RG, Muñoz JE, Barros LM, Alves-Jr SL, Taborda CP, Stambuk BU. The secreted acid trehalase encoded by the CgATH1 gene is involved in Candida glabrata virulence. Mem Inst Oswaldo Cruz 2020; 115:e200401. [PMID: 33146242 PMCID: PMC7607559 DOI: 10.1590/0074-02760200401] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/30/2020] [Accepted: 10/05/2020] [Indexed: 01/04/2023] Open
Abstract
BACKGROUND Candida glabrata yeast is the second cause of candidiasis worldwide. Differs from other yeasts since assimilates only glucose and trehalose (a characteristic used in rapid identification tests for this pathogen) by secreting into the medium a highly active acid trehalase encoded by the CgATH1 gene. OBJECTIVE This study aimed to characterise the function of the acid trehalase in the physiopathology of C. glabrata. METHODS Gene deletion was performed to obtain a mutant ath1Δ strain, and the ability of the ath1Δ strain to grow in trehalase, or the presence of trehalase activity in the ath1Δ yeast cells, was verified. We also tested the virulence of the ath1Δ strain in a murine model of infection. FINDINGS The ath1Δ mutant strain grows normally in the presence of glucose, but loses its ability to grow in trehalose. Due to the high acid trehalase activity present in wild-type cells, the cytoplasmic neutral trehalase activity is only detected in the ath1Δ strain. We also observed a significantly lower virulence of the ath1Δ strain in a murine model of infection with either normal or immunocompromised mice. MAIN CONCLUSIONS The acid trehalase is involved in the hydrolysis of external trehalose by C. glabrata, and the enzyme also plays a major virulence role during infectivity.
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Affiliation(s)
- Rafael G Lopes
- Universidade Federal de Santa Catarina, Centro de Ciências Biológicas, Departamento de Bioquímica, Florianópolis, SC, Brasil
| | - Julián E Muñoz
- Universidade de São Paulo, Instituto de Ciências Biomédicas, Departamento de Microbiologia, São Paulo, SP, Brasil.,Universidade de São Paulo, Faculdade de Medicina, Instituto de Medicina Tropical de São Paulo, Departamento de Dermatologia, Laboratório de Micologia Médica/LIM53, São Paulo, SP, Brasil.,Universidad del Rosario, Escuela de Medicina y Ciencias de la Salud, Bogotá, Colombia
| | - Ludmila M Barros
- Universidade Federal de Santa Catarina, Centro de Ciências Biológicas, Departamento de Bioquímica, Florianópolis, SC, Brasil
| | - Sergio L Alves-Jr
- Universidade Federal da Fronteira Sul, Laboratório de Bioquímica e Genética, Chapecó, SC, Brasil
| | - Carlos P Taborda
- Universidade de São Paulo, Instituto de Ciências Biomédicas, Departamento de Microbiologia, São Paulo, SP, Brasil.,Universidade de São Paulo, Faculdade de Medicina, Instituto de Medicina Tropical de São Paulo, Departamento de Dermatologia, Laboratório de Micologia Médica/LIM53, São Paulo, SP, Brasil
| | - Boris U Stambuk
- Universidade Federal de Santa Catarina, Centro de Ciências Biológicas, Departamento de Bioquímica, Florianópolis, SC, Brasil
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Grijalva-Vallejos N, Krogerus K, Nikulin J, Magalhães F, Aranda A, Matallana E, Gibson B. Potential application of yeasts from Ecuadorian chichas in controlled beer and chicha production. Food Microbiol 2020; 98:103644. [PMID: 33875226 DOI: 10.1016/j.fm.2020.103644] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/25/2020] [Revised: 09/11/2020] [Accepted: 09/15/2020] [Indexed: 11/30/2022]
Abstract
The potential of yeasts isolated from traditional chichas as starter cultures, either for controlled production of the native beverage or for industrial beer production, has been investigated. Three S. cerevisiae strains and one T. delbrueckii strain isolated from four different Ecuadorian chichas were compared to ale and lager beer strains with respect to fermentation performance, sugar utilisation, phenolic off-flavour production, flocculation and growth at low temperature. Fermentations were performed in 15 °P all-malt wort and in a model chicha substrate at 12 °C and 20 °C. Tall-tube fermentations (1.5 L) were also performed with both substrates to assess yeast performance and beer quality. Among the strains tested, only one Ecuadorian S. cerevisiae strain was able to ferment the wort sugars maltose and maltotriose. Fermentations with all Ecuadorian strains were poor in wort at 12 °C relative to 20 °C, but were similar in model chicha substrate at both temperatures. The aromatic profile was different between species and strains. These results indicate the potential of yeasts derived from traditional Andean fermented beverages for commercial applications. One of the chicha strains demonstrated traits typical of domesticated brewery strains and could be suitable for ale fermentation, while the other strains may have potential for low-alcohol beer or chicha production.
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Affiliation(s)
- N Grijalva-Vallejos
- Institute for Integrative Systems Biology (I2SysBio), University of Valencia-CSIC, 46980, Paterna, Valencia, Spain
| | - K Krogerus
- VTT Technical Research Centre of Finland Ltd, Tietotie 2, P.O. Box 1000, FI-02044 VTT, Espoo, Finland
| | - J Nikulin
- VTT Technical Research Centre of Finland Ltd, Tietotie 2, P.O. Box 1000, FI-02044 VTT, Espoo, Finland; Chemical Process Engineering, Faculty of Technology, University of Oulu, P.O. Box 8000, FI-90014, Oulun Yliopisto, Finland
| | - F Magalhães
- VTT Technical Research Centre of Finland Ltd, Tietotie 2, P.O. Box 1000, FI-02044 VTT, Espoo, Finland
| | - A Aranda
- Institute for Integrative Systems Biology (I2SysBio), University of Valencia-CSIC, 46980, Paterna, Valencia, Spain
| | - E Matallana
- Institute for Integrative Systems Biology (I2SysBio), University of Valencia-CSIC, 46980, Paterna, Valencia, Spain
| | - B Gibson
- VTT Technical Research Centre of Finland Ltd, Tietotie 2, P.O. Box 1000, FI-02044 VTT, Espoo, Finland; Chair of Brewing and Beverage Technology, Technische Universität Berlin, Seestraße 13, 13353, Berlin, Germany.
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11
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Bermejo PM, Raghavendran V, Gombert AK. Neither 1G nor 2G fuel ethanol: setting the ground for a sugarcane-based biorefinery using an iSUCCELL yeast platform. FEMS Yeast Res 2020; 20:5836716. [PMID: 32401320 DOI: 10.1093/femsyr/foaa027] [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: 03/24/2020] [Accepted: 05/11/2020] [Indexed: 11/12/2022] Open
Abstract
First-generation (1G) fuel ethanol production in sugarcane-based biorefineries is an established economic enterprise in Brazil. Second-generation (2G) fuel ethanol from lignocellulosic materials, though extensively investigated, is currently facing severe difficulties to become economically viable. Some of the challenges inherent to these processes could be resolved by efficiently separating and partially hydrolysing the cellulosic fraction of the lignocellulosic materials into the disaccharide cellobiose. Here, we propose an alternative biorefinery, where the sucrose-rich stream from the 1G process is mixed with a cellobiose-rich stream in the fermentation step. The advantages of mixing are 3-fold: (i) decreased concentrations of metabolic inhibitors that are typically produced during pretreatment and hydrolysis of lignocellulosic materials; (ii) decreased cooling times after enzymatic hydrolysis prior to fermentation; and (iii) decreased availability of free glucose for contaminating microorganisms and undesired glucose repression effects. The iSUCCELL platform will be built upon the robust Saccharomyces cerevisiae strains currently present in 1G biorefineries, which offer competitive advantage in non-aseptic environments, and into which intracellular hydrolyses of sucrose and cellobiose will be engineered. It is expected that high yields of ethanol can be achieved in a process with cell recycling, lower contamination levels and decreased antibiotic use, when compared to current 2G technologies.
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Affiliation(s)
| | - Vijayendran Raghavendran
- Department of Molecular Biology and Biotechnology, University of Sheffield, Firth Court, Western Bank, Sheffield S10 2TN, UK
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12
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Tao X, Huang Y, Wang C, Chen F, Yang L, Ling L, Che Z, Chen X. Recent developments in molecular docking technology applied in food science: a review. Int J Food Sci Technol 2019. [DOI: 10.1111/ijfs.14325] [Citation(s) in RCA: 50] [Impact Index Per Article: 10.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
Affiliation(s)
- Xuan Tao
- School of Food and Bioengineering Xihua University Chengdu Sichuan 610039 China
| | - Yukun Huang
- School of Food and Bioengineering Xihua University Chengdu Sichuan 610039 China
- Key Laboratory of Food Non Thermal Processing Engineering Technology Research Center of Food Non Thermal Processing Yibin Xihua University Research Institute Yibin Sichuan 644404 China
| | - Chong Wang
- School of Food and Bioengineering Xihua University Chengdu Sichuan 610039 China
| | - Fang Chen
- School of Food and Bioengineering Xihua University Chengdu Sichuan 610039 China
| | - Lingling Yang
- School of Food and Bioengineering Xihua University Chengdu Sichuan 610039 China
| | - Li Ling
- School of Food and Bioengineering Xihua University Chengdu Sichuan 610039 China
- College of Pharmacy Chengdu University of Traditional Chinese Medicine Chengdu Sichuan 611137 China
| | - Zhenming Che
- School of Food and Bioengineering Xihua University Chengdu Sichuan 610039 China
| | - Xianggui Chen
- School of Food and Bioengineering Xihua University Chengdu Sichuan 610039 China
- Key Laboratory of Food Non Thermal Processing Engineering Technology Research Center of Food Non Thermal Processing Yibin Xihua University Research Institute Yibin Sichuan 644404 China
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