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Chetty BJ, Inokuma K, Hasunuma T, van Zyl WH, den Haan R. Improvement of cell-tethered cellulase activity in recombinant strains of Saccharomyces cerevisiae. Appl Microbiol Biotechnol 2022; 106:6347-6361. [PMID: 35951080 DOI: 10.1007/s00253-022-12114-7] [Citation(s) in RCA: 6] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/19/2022] [Revised: 07/27/2022] [Accepted: 07/28/2022] [Indexed: 11/30/2022]
Abstract
Consolidated bioprocessing (CBP) remains an attractive option for the production of commodity products from pretreated lignocellulose if a process-suitable organism can be engineered. The yeast Saccharomyces cerevisiae requires engineered cellulolytic activity to enable its use in CBP production of second-generation (2G) bioethanol. A promising strategy for heterologous cellulase production in yeast entails displaying enzymes on the cell surface by means of glycosylphosphatidylinositol (GPI) anchors. While strains producing a core set of cell-adhered cellulases that enabled crystalline cellulose hydrolysis have been created, secreted levels of enzyme were insufficient for complete cellulose hydrolysis. In fact, all reported recombinant yeast CBP candidates must overcome the drawback of generally low secretion titers. Rational strain engineering can be applied to enhance the secretion phenotype. This study aimed to improve the amount of cell-adhered cellulase activities of recombinant S. cerevisiae strains expressing a core set of four cellulases, through overexpression of genes that were previously shown to enhance cellulase secretion. Results showed significant increases in cellulolytic activity for all cell-adhered cellulase enzyme types. Cell-adhered cellobiohydrolase activity was improved by up to 101%, β-glucosidase activity by up to 99%, and endoglucanase activity by up to 231%. Improved hydrolysis of crystalline cellulose of up to 186% and improved ethanol yields from this substrate of 40-50% in different strain backgrounds were also observed. In addition, improvement in resistance to fermentation stressors was noted in some strains. These strains represent a step towards more efficient organisms for use in 2G biofuel production. KEY POINTS: • Cell-surface-adhered cellulase activity was improved in strains engineered for CBP. • Levels of improvement of activity were strain and enzyme dependent. • Crystalline cellulose conversion to ethanol could be improved up to 50%.
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Affiliation(s)
- Bronwyn Jean Chetty
- Department of Biotechnology, University of the Western Cape, Bellville, South Africa
| | - Kentaro Inokuma
- Graduate School of Science, Technology and Innovation, Kobe University, 1-1 Rokkodai-cho, Nada-ku, Kobe, 657-8501, Japan
| | - Tomohisa Hasunuma
- Graduate School of Science, Technology and Innovation, Kobe University, 1-1 Rokkodai-cho, Nada-ku, Kobe, 657-8501, Japan
- Engineering Biology Research Center, Kobe University, 1-1 Rokkodai-cho, Nada-ku, Kobe, 657-8501, Japan
| | | | - Riaan den Haan
- Department of Biotechnology, University of the Western Cape, Bellville, South Africa.
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Li X, Cen N, Liu L, Chen Y, Yang X, Yu K, Guo J, Liao X, Shi B. Collagen Peptide Provides Saccharomyces cerevisiae with Robust Stress Tolerance for Enhanced Bioethanol Production. ACS APPLIED MATERIALS & INTERFACES 2020; 12:53879-53890. [PMID: 33211491 DOI: 10.1021/acsami.0c18919] [Citation(s) in RCA: 14] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/11/2023]
Abstract
Efficient production of bioethanol is desirable for bioenergy large-scale applications, but it is severely challenged by ethanol and sugar stresses. Here, collagen peptide (CP), as a renewable nitrogen-containing biomass, remarkably enhanced the stress resistance of Saccharomyces cerevisiae SLL-510 against ethanol challenge, based on its unique amino acid composition. Transcriptome analysis showed that the energy, lipid, cofactor, and vitamin metabolism may involve in stress tolerance provided by CP. When CP was added into the media containing 249.99 mg/mL glucose, the bioethanol yield increased from 8.03 to 12.25% (v/v) and 11.35 to 12.29% (v/v) at 43 and 120 h, respectively. Moreover, at 286.79 mg/mL glucose, the highest yield reached 14.48% (v/v), with 99.58% glucose utilization rate. The protection and promotion effects of CP were also shown by four other industrial S. cerevisiae strains. These results coupled with the advantages of abundant reserves, cleanliness, and renewability revealed that CP is a promising economically viable and industrially scalable enhancer for bioethanol fermentation.
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Affiliation(s)
- Xia Li
- Department of Biomass and Leather Engineering, Sichuan University, Chengdu 610065, PR China
| | - Nengkai Cen
- Department of Biomass and Leather Engineering, Sichuan University, Chengdu 610065, PR China
| | - Lu Liu
- Department of Biomass and Leather Engineering, Sichuan University, Chengdu 610065, PR China
| | - Yongle Chen
- Department of Biomass and Leather Engineering, Sichuan University, Chengdu 610065, PR China
| | - Xi Yang
- Department of Biomass and Leather Engineering, Sichuan University, Chengdu 610065, PR China
| | - Kang Yu
- Department of Biomass and Leather Engineering, Sichuan University, Chengdu 610065, PR China
| | - Junling Guo
- Department of Biomass and Leather Engineering, Sichuan University, Chengdu 610065, PR China
| | - Xuepin Liao
- Department of Biomass and Leather Engineering, Sichuan University, Chengdu 610065, PR China
- The Key Laboratory of Leather Chemistry and Engineering of Ministry of Education, Sichuan University, Chengdu 610065, PR China
| | - Bi Shi
- Department of Biomass and Leather Engineering, Sichuan University, Chengdu 610065, PR China
- The Key Laboratory of Leather Chemistry and Engineering of Ministry of Education, Sichuan University, Chengdu 610065, PR China
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Phukoetphim N, Khongsay N, Laopaiboon P, Laopaiboon L. A novel aeration strategy in repeated-batch fermentation for efficient ethanol production from sweet sorghum juice. Chin J Chem Eng 2019. [DOI: 10.1016/j.cjche.2018.11.010] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
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Vučurović VM, Puškaš VS, Miljić UD. Bioethanol production from sugar beet molasses and thick juice by free and immobilisedSaccharomyces cerevisiae. JOURNAL OF THE INSTITUTE OF BREWING 2018. [DOI: 10.1002/jib.536] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Affiliation(s)
- Vesna M. Vučurović
- Department of Biotechnology and Pharmaceutical engineering, Faculty of Technology; University of Novi Sad; Boulevard Cara Lazara 1 21000 Novi Sad Republic of Serbia
| | - Vladimir S. Puškaš
- Department of Biotechnology and Pharmaceutical engineering, Faculty of Technology; University of Novi Sad; Boulevard Cara Lazara 1 21000 Novi Sad Republic of Serbia
| | - Uroš D. Miljić
- Department of Biotechnology and Pharmaceutical engineering, Faculty of Technology; University of Novi Sad; Boulevard Cara Lazara 1 21000 Novi Sad Republic of Serbia
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Yuan WJ, Li NN, Zhao XQ, Chen LJ, Kong L, Bai FW. Engineering an industrialSaccharomyces cerevisiaestrain with the inulinase gene for more efficient ethanol production from Jerusalem artichoke tubers. Eng Life Sci 2013. [DOI: 10.1002/elsc.201200199] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022] Open
Affiliation(s)
- Wen-Jie Yuan
- School of Life Science and Biotechnology; Dalian University of Technology; Dalian China
| | - Nan-Nan Li
- School of Life Science and Biotechnology; Dalian University of Technology; Dalian China
| | - Xin-Qing Zhao
- School of Life Science and Biotechnology; Dalian University of Technology; Dalian China
| | - Li-Jie Chen
- School of Life Science and Biotechnology; Dalian University of Technology; Dalian China
| | - Liang Kong
- College of Marine Technology and Environment; Dalian Ocean University; Dalian China
| | - Feng-Wu Bai
- School of Life Science and Biotechnology; Dalian University of Technology; Dalian China
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