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Nagamatsu ST, Coutouné N, José J, Fiamenghi MB, Pereira GAG, Oliveira JVDC, Carazzolle MF. Ethanol production process driving changes on industrial strains. FEMS Yeast Res 2021; 21:6070656. [PMID: 33417685 DOI: 10.1093/femsyr/foaa071] [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: 12/01/2020] [Accepted: 01/04/2021] [Indexed: 12/16/2022] Open
Abstract
Ethanol production has key differences between the two largest producing countries of this biofuel, Brazil and the USA, such as feedstock source, sugar concentration and ethanol titers in industrial fermentation. Therefore, it is highly probable that these specificities have led to genome adaptation of the Saccharomyces cerevisiae strains employed in each process to tolerate different environments. In order to identify particular adaptations, in this work, we have compared the genomes of industrial yeast strains widely used to produce ethanol from sugarcane, corn and sweet sorghum, and also two laboratory strains as reference. The genes were predicted and then 4524 single-copy orthologous were selected to build the phylogenetic tree. We found that the geographic location and industrial process were shown as the main evolutionary drivers: for sugarcane fermentation, positive selection was identified for metal homeostasis and stress response genes, whereas genes involved in membrane modeling have been connected with corn fermentation. In addition, the corn specialized strain Ethanol Red showed an increased number of copies of MAL31, a gene encoding a maltose transporter. In summary, our work can help to guide new strain chassis selection for engineering strategies, to produce more robust strains for biofuel production and other industrial applications.
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Affiliation(s)
- Sheila Tiemi Nagamatsu
- Division of Human Genetics, Department of Psychiatry, Yale School of Medicine, 333 Cedar St, New Haven, CT, 06510, USA.,Laboratório de Genômica e BioEnergia, Departamento de Genética, Evolução, Microbiologia e Imunologia, Universidade Estadual de Campinas (UNICAMP), Cidade Universitária Zeferino Vaz, Campinas, São Paulo, 13083-970, Brazil
| | - Natalia Coutouné
- Laboratório Nacional de Biorrenováveis (LNBR), Centro Nacional de Pesquisa em Energia e Materiais (CNPEM), CEP 13083-970, Campinas, São Paulo, Brazil
| | - Juliana José
- Laboratório de Genômica e BioEnergia, Departamento de Genética, Evolução, Microbiologia e Imunologia, Universidade Estadual de Campinas (UNICAMP), Cidade Universitária Zeferino Vaz, Campinas, São Paulo, 13083-970, Brazil
| | - Mateus Bernabe Fiamenghi
- Laboratório de Genômica e BioEnergia, Departamento de Genética, Evolução, Microbiologia e Imunologia, Universidade Estadual de Campinas (UNICAMP), Cidade Universitária Zeferino Vaz, Campinas, São Paulo, 13083-970, Brazil
| | - Gonçalo Amarante Guimarães Pereira
- Laboratório de Genômica e BioEnergia, Departamento de Genética, Evolução, Microbiologia e Imunologia, Universidade Estadual de Campinas (UNICAMP), Cidade Universitária Zeferino Vaz, Campinas, São Paulo, 13083-970, Brazil
| | - Juliana Velasco de Castro Oliveira
- Laboratório Nacional de Biorrenováveis (LNBR), Centro Nacional de Pesquisa em Energia e Materiais (CNPEM), CEP 13083-970, Campinas, São Paulo, Brazil
| | - Marcelo Falsarella Carazzolle
- Laboratório de Genômica e BioEnergia, Departamento de Genética, Evolução, Microbiologia e Imunologia, Universidade Estadual de Campinas (UNICAMP), Cidade Universitária Zeferino Vaz, Campinas, São Paulo, 13083-970, Brazil
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Monteiro B, Ferraz P, Barroca M, da Cruz SH, Collins T, Lucas C. Conditions promoting effective very high gravity sugarcane juice fermentation. BIOTECHNOLOGY FOR BIOFUELS 2018; 11:251. [PMID: 30237826 PMCID: PMC6142328 DOI: 10.1186/s13068-018-1239-0] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/27/2018] [Accepted: 08/27/2018] [Indexed: 05/07/2023]
Abstract
BACKGROUND Applying very high gravity (VHG) fermentation conditions to the sugarcane juice (SCJ) bioethanol industry would improve its environmental and economic sustainability without the need for major infrastructure changes or investments. It could enable a decrease in the consumption of biological and natural resources (cane/land, water and energy) while maintaining acceptable production parameters. The present study attempts to demonstrate and characterise an effective industrially relevant SCJ-VHG fermentation process. RESULTS An industry-like SCJ-VHG bioethanol production process with 30 and 35 °Bx broth was employed to investigate the effects of both the yeast strain used and nitrogen source supplementation on process yield, process productivity, biomass viability, glycerol concentration and retention-associated gene expression. Process performance was shown to be variably affected by the different process conditions investigated. Highest process efficiency, with a 17% (w/v) ethanol yield and only 0.2% (w/v) sugar remaining unfermented, was observed with the Saccharomyces cerevisiae industrial strain CAT-1 in 30 °Bx broth with urea supplementation. In addition, efficient retention of glycerol by the yeast strain was identified as a requisite for better fermentation and was consistent with a higher expression of glycerol permease STL1 and channel FPS1. Urea was shown to promote the deregulation of STL1 expression, overcoming glucose repression. The consistency between Fps1-mediated ethanol secretion and ethanol in the extracellular media reinforces previous suggestions that ethanol might exit the cell through the Fps1 channel. CONCLUSIONS This work brings solid evidence in favour of the utilisation of VHG conditions in SCJ fermentations, bringing it a step closer to industrial application. SCJ concentrated up to 30 °Bx maintains industrially relevant ethanol production yield and productivity, provided the broth is supplemented with a suitable nitrogen source and an appropriate industrial bioethanol-producing yeast strain is used. In addition, the work contributes to a better understanding of the VHG-SCJ process and the variable effects of process parameters on process efficiency and yeast strain response.
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Affiliation(s)
- Bruno Monteiro
- Laboratory of Food and Beverage Biotechnology, ESALQ, University of São Paulo, Piracicaba, SP 13418-900 Brazil
- Centre of Molecular and Environmental Biology (CBMA), University of Minho, 4710-057 Braga, Portugal
| | - Pedro Ferraz
- Centre of Molecular and Environmental Biology (CBMA), University of Minho, 4710-057 Braga, Portugal
- Institute of Science and Innovation for Bio-Sustainability (IB-S)/CBMA, University of Minho, Campus de Gualtar, 4710-057 Braga, Portugal
| | - Mário Barroca
- Centre of Molecular and Environmental Biology (CBMA), University of Minho, 4710-057 Braga, Portugal
- Institute of Science and Innovation for Bio-Sustainability (IB-S)/CBMA, University of Minho, Campus de Gualtar, 4710-057 Braga, Portugal
| | - Sandra H. da Cruz
- Laboratory of Food and Beverage Biotechnology, ESALQ, University of São Paulo, Piracicaba, SP 13418-900 Brazil
| | - Tony Collins
- Centre of Molecular and Environmental Biology (CBMA), University of Minho, 4710-057 Braga, Portugal
- Institute of Science and Innovation for Bio-Sustainability (IB-S)/CBMA, University of Minho, Campus de Gualtar, 4710-057 Braga, Portugal
| | - Cândida Lucas
- Centre of Molecular and Environmental Biology (CBMA), University of Minho, 4710-057 Braga, Portugal
- Institute of Science and Innovation for Bio-Sustainability (IB-S)/CBMA, University of Minho, Campus de Gualtar, 4710-057 Braga, Portugal
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Barbosa HS, Silveira EDA, Miranda M, Ernandes JR. Efficient very-high-gravity fermentation of sugarcane molasses by industrial yeast strains. JOURNAL OF THE INSTITUTE OF BREWING 2016. [DOI: 10.1002/jib.317] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
Affiliation(s)
- Heloisy Suzes Barbosa
- Instituto de Química, UNESP - Univ Estadual Paulista; PO Box 335, 14801-970 Araraquara SP Brazil
| | - Erick de Abreu Silveira
- Instituto de Química, UNESP - Univ Estadual Paulista; PO Box 335, 14801-970 Araraquara SP Brazil
| | - Messias Miranda
- Instituto de Química, UNESP - Univ Estadual Paulista; PO Box 335, 14801-970 Araraquara SP Brazil
| | - José Roberto Ernandes
- Instituto de Química, UNESP - Univ Estadual Paulista; PO Box 335, 14801-970 Araraquara SP Brazil
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