Bioethanol production from marine biomass alginate by metabolically engineered bacteria
Bioethanol production from algae is a promising approach that resolves problems associated with biofuel production from land biomass, such as bioethanol-food conflicts and the indirect land use change. However, it presents several technical difficulties because existing ethanologenic microbes can ne...
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Published in | Energy & environmental science Vol. 4; no. 7; pp. 2575 - 2581 |
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Main Authors | , , , , |
Format | Journal Article |
Language | English |
Published |
01.01.2011
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Subjects | |
Online Access | Get full text |
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Summary: | Bioethanol production from algae is a promising approach that resolves problems associated with biofuel production from land biomass, such as bioethanol-food conflicts and the indirect land use change. However, it presents several technical difficulties because existing ethanologenic microbes can neither degrade alginate, a major component of brown algae, nor assimilate alginate degradation products. We developed an integrated bacterial system for converting alginate to ethanol using a metabolically modified, alginate-assimilating, pit-forming bacterium, Sphingomonas sp. A1 (strain A1). Overexpression of Zymomonas mobilis pdc and adhB was achieved using a strong constitutive expression promoter newly identified in strain A1 and by inserting multiple gene copies using the methylation sensitivity of XbaI. Metabolome analysis revealed by-product accumulation, and its synthesis pathway was blocked by gene disruption. The ethanologenic recombinant strain A1 accumulated 13.0 g L-1 ethanol in 3 d using alginate as the sole carbon source. |
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Bibliography: | ObjectType-Article-1 SourceType-Scholarly Journals-1 ObjectType-Feature-2 content type line 23 |
ISSN: | 1754-5692 1754-5706 |
DOI: | 10.1039/C1EE01236C |