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Procópio DP, Lee JW, Shin J, Tramontina R, Ávila PF, Brenelli LB, Squina FM, Damasio A, Rabelo SC, Goldbeck R, Franco TT, Leak D, Jin YS, Basso TO. Metabolic engineering of Saccharomyces cerevisiae for second-generation ethanol production from xylo-oligosaccharides and acetate. Sci Rep 2023; 13:19182. [PMID: 37932303 PMCID: PMC10628280 DOI: 10.1038/s41598-023-46293-8] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/22/2023] [Accepted: 10/30/2023] [Indexed: 11/08/2023] Open
Abstract
Simultaneous intracellular depolymerization of xylo-oligosaccharides (XOS) and acetate fermentation by engineered Saccharomyces cerevisiae offers significant potential for more cost-effective second-generation (2G) ethanol production. In the present work, the previously engineered S. cerevisiae strain, SR8A6S3, expressing enzymes for xylose assimilation along with an optimized route for acetate reduction, was used as the host for expressing two β-xylosidases, GH43-2 and GH43-7, and a xylodextrin transporter, CDT-2, from Neurospora crassa, yielding the engineered SR8A6S3-CDT-2-GH34-2/7 strain. Both β-xylosidases and the transporter were introduced by replacing two endogenous genes, GRE3 and SOR1, that encode aldose reductase and sorbitol (xylitol) dehydrogenase, respectively, and catalyse steps in xylitol production. The engineered strain, SR8A6S3-CDT-2-GH34-2/7 (sor1Δ gre3Δ), produced ethanol through simultaneous XOS, xylose, and acetate co-utilization. The mutant strain produced 60% more ethanol and 12% less xylitol than the control strain when a hemicellulosic hydrolysate was used as a mono- and oligosaccharide source. Similarly, the ethanol yield was 84% higher for the engineered strain using hydrolysed xylan, compared with the parental strain. Xylan, a common polysaccharide in lignocellulosic residues, enables recombinant strains to outcompete contaminants in fermentation tanks, as XOS transport and breakdown occur intracellularly. Furthermore, acetic acid is a ubiquitous toxic component in lignocellulosic hydrolysates, deriving from hemicellulose and lignin breakdown. Therefore, the consumption of XOS, xylose, and acetate expands the capabilities of S. cerevisiae for utilization of all of the carbohydrate in lignocellulose, potentially increasing the efficiency of 2G biofuel production.
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Affiliation(s)
- Dielle Pierotti Procópio
- Department of Chemical Engineering, Escola Politécnica, Universidade de São Paulo (USP), São Paulo, SP, 05508-010, Brazil
- Departamento de Química Fundamental, Instituto de Química, Universidade de São Paulo), São Paulo, SP, 05508-900, Brazil
| | - Jae Won Lee
- DOE Center for Advanced Bioenergy and Bioproducts Innovation (CABER), University of Illinois at Urbana-Champaign, Urbana, IL, 61801, USA
- Department of Food Science and Human Nutrition, University of Illinois at Urbana-Champaign (UIUC), Urbana, IL, 61801, USA
| | - Jonghyeok Shin
- DOE Center for Advanced Bioenergy and Bioproducts Innovation (CABER), University of Illinois at Urbana-Champaign, Urbana, IL, 61801, USA
- Department of Food Science and Human Nutrition, University of Illinois at Urbana-Champaign (UIUC), Urbana, IL, 61801, USA
- Synthetic Biology & Bioengineering Research Center, Korea Research Institute of Bioscience and Biotechnology, Daejeon, 34141, Republic of Korea
| | - Robson Tramontina
- Department of Biochemistry and Tissue Biology, Institute of Biology, University of Campinas (UNICAMP), Campinas, SP, 13083-862, Brazil
- Environment and Technological Processes Program, University of Sorocaba (UNISO), Sorocaba, SP, 18023-000, Brazil
| | - Patrícia Felix Ávila
- School of Food Engineering, University of Campinas (UNICAMP), Campinas, SP, 13083-862, Brazil
| | - Lívia Beatriz Brenelli
- Interdisciplinary Centre of Energy Planning, University of Campinas (UNICAMP), Campinas, SP, 13083-896, Brazil
| | - Fabio Márcio Squina
- Environment and Technological Processes Program, University of Sorocaba (UNISO), Sorocaba, SP, 18023-000, Brazil
| | - André Damasio
- Department of Biochemistry and Tissue Biology, Institute of Biology, University of Campinas (UNICAMP), Campinas, SP, 13083-862, Brazil
| | - Sarita Cândida Rabelo
- Departament of Bioprocesses and Biotechnology, School of Agriculture, Sao Paulo State University (UNESP), Botucatu, SP, 18618-687, Brazil
| | - Rosana Goldbeck
- School of Food Engineering, University of Campinas (UNICAMP), Campinas, SP, 13083-862, Brazil
| | - Telma Teixeira Franco
- Interdisciplinary Centre of Energy Planning, University of Campinas (UNICAMP), Campinas, SP, 13083-896, Brazil
- School of Chemical Engineering, University of Campinas (UNICAMP), Campinas, SP, 13083-852, Brazil
| | - David Leak
- Department of Biology and Biochemistry, University of Bath, Claverton Down, Bath, BA2 7AY, UK
| | - Yong-Su Jin
- DOE Center for Advanced Bioenergy and Bioproducts Innovation (CABER), University of Illinois at Urbana-Champaign, Urbana, IL, 61801, USA
- Department of Food Science and Human Nutrition, University of Illinois at Urbana-Champaign (UIUC), Urbana, IL, 61801, USA
| | - Thiago Olitta Basso
- Department of Chemical Engineering, Escola Politécnica, Universidade de São Paulo (USP), São Paulo, SP, 05508-010, Brazil.
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Guo H, Zhao Y, Chang JS, Lee DJ. Enzymes and enzymatic mechanisms in enzymatic degradation of lignocellulosic biomass: A mini-review. BIORESOURCE TECHNOLOGY 2023; 367:128252. [PMID: 36334864 DOI: 10.1016/j.biortech.2022.128252] [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: 09/29/2022] [Revised: 10/26/2022] [Accepted: 10/28/2022] [Indexed: 06/16/2023]
Abstract
Enzymatic hydrolysis is the key step limiting the efficiency of the biorefinery of lignocellulosic biomass. Enzymes involved in enzymatic hydrolysis and their interactions with biomass should be comprehended to form the basis for looking for strategies to improve process efficiency. This article updates the contemporary research on the properties of key enzymes in the lignocellulose biorefinery and their interactions with biomass, adsorption, and hydrolysis. The advanced analytical techniques to track the interactions for exploiting mechanisms are discussed. The challenges and prospects for future research are outlined.
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Affiliation(s)
- Hongliang Guo
- College of Forestry, Northeast Forestry University, Harbin 150040, China
| | - Ying Zhao
- College of Forestry, Northeast Forestry University, Harbin 150040, China
| | - Jo-Shu Chang
- Research Center for Smart Sustainable Circular Economy, Tunghai University, Taichung 407, Taiwan; Department of Chemical Engineering, National Cheng Kung University, Tainan, Taiwan; Department of Chemical and Materials Engineering, Tunghai University, Taichung 407, Taiwan
| | - Duu-Jong Lee
- Department of Mechanical Engineering, City University of Hong Kong, Kowloon Tong, Hong Kong; Department of Chemical Engineering and Materials Science, Yuan Ze University, Chung-li 32003, Taiwan.
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