期刊
JOURNAL OF BIOTECHNOLOGY
卷 231, 期 -, 页码 129-135出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.jbiotec.2016.06.002
关键词
Macroalgae; Laminarin; Saccharomyces cerevisiae; Cell surface engineering; Coculture; Ethanol
资金
- Core Research for Evolutional Science and Technology (CREST) of Japan Science and Technology Corporation (JST)
Laminarin is the algal storage glucan and represents up to 35% of the dry weight of brown macroalgae. In this study, a novel laminarinase, G1y5M, was first found using focused proteome analysis of a laminarin-assimilating marine bacterium, Saccharophagus degradans, and the encoding gene was isolated. A G1y5M-displaying yeast strain was prepared with the cell surface display system using Saccharomyces cerevisiae. It showed a laminarin-degrading activity on the cell surface and caused the dominant accumulation of gentiobiose. The obtained gentiobiose was converted into glucose and could be assimilated by an Aspergillus aculeatus p-glucosidase (BG)-displaying yeast strain. When G1y5M- and BG-displaying yeasts were anaerobically cultivated together in fermentation medium containing 20 g/L laminarin as a sole carbon source, the coculture system with the combination of optimized ratios of the 2 yeast strains directly produced 5.2 g/L ethanol. This coculture system of the 2 engineered yeast strains would be a platform for the use of laminarin and contribute to the complete utilization of brown macroalgae. (C) 2016 Elsevier B.V. All rights reserved.
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