Journal
PROCESS BIOCHEMISTRY
Volume 47, Issue 9, Pages 1287-1294Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.procbio.2012.05.004
Keywords
Bioethanol; Lignocellulose; Thermotolerance; Biomass; Consolidated bioprocessing; Simultaneous saccharification and fermentation; Saccharomyces cerevisiae; Cell surface engineering
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Funding
- New Energy and Industrial Technology Development Organization (NEDO) [P07015]
- Ministry of Economy. Trade, and Industry (METI) of Japan
- Ministry of Education, Culture, Sports and Technology (MEXT) of Japan
- Special Coordination Funds for Promoting Science and Technology, Creation of Innovative Centers for Advanced Interdisciplinary Research Areas (Innovative Bioproduction Kobe), MEXT, Japan
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Consolidated bioprocessing (CBP), which integrates enzyme production, saccharification and fermentation into a single process, is a promising strategy for effective ethanol production from lignocellulosic materials because of the resulting reduction in utilities, the substrate and other raw materials and simplification of operation. CBP requires a highly engineered microbial strain capable of hydrolyzing biomass with enzymes produced on its own and producing high-titer ethanol. Recently, heterologous production of cellulolytic enzymes has been pursued with yeast hosts, which has realized direct conversion of cellulose to ethanol. Specifically, the development of cell surface engineering, which provides a display of cellulolytic enzymes on the yeast cell surface, facilitates effective biomass hydrolysis concomitantly with ethanol production. On the other hand, the difference in optimum temperature between saccharification and fermentation is a drawback of efficient ethanol production in the simultaneous saccharification and fermentation (SSF). The application of thermotolerant yeast strains engineered to the SSF process would overcome the drawback by performing hydrolysis and fermentation at elevated temperature. In this review, we focus on the recent advances in the application of thermotolerant yeast to CBP and SSF of lignocellulosic material to ethanol. The development of thermotolerant and ethanologenic yeast strains with the ability to hydrolyze lignocellulosic materials is emphasized for high-temperature CBP. (C) 2012 Elsevier Ltd. All rights reserved.
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