Bioethanol production from marine biomass alginate by metabolically engineered bacteria
Energy and Environmental Science, ISSN: 1754-5692, Vol: 4, Issue: 7, Page: 2575-2581
2011
- 155Citations
- 141Captures
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Article Description
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 ethanol in 3 d using alginate as the sole carbon source. © 2011 The Royal Society of Chemistry.
Bibliographic Details
Royal Society of Chemistry (RSC)
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