In most current biomass-to-biofuel strategies, plant material must be first broken down into its component sugars and then converted to ethanol in a separate step, resulting in a costly and inefficient process. Researchers at the DOE Bioenergy Science Center (BESC) and the University of California, Los Angeles, have now successfully engineered the cellulose-degrading bacterium Clostridium cellulolyticum to convert cellulose directly to isobutanol, a liquid fuel with much higher energy density than ethanol and, unlike ethanol, with the potential to be directly used in current engines. This consolidated bioprocessing (CBP) approach, in which a single organism both deconstructs plant cellulose and converts it to a biofuel in one step, significantly improves overall process efficiency. Until now no single microbe was known to possess the necessary combination of biomass degradation and fuel synthesis properties, and the most promising organisms are extremely challenging to genetically manipulate. This breakthrough thus provides a promising new avenue to engineer similar organisms for single-step conversion of plant biomass to fuels.
Reference: Higashide, W., Y. Li, Y. Yang, and J. C. Liao. 2011. “Metabolic Engineering of Clostridium cellulolyticumfor Isobutanol Production from Cellulose,” Applied and Environmental Microbiology, published online March 4, 2011 (doi:10.1128/AEM.02454-10).
Contact: Joseph Graber, SC-23.2, (301) 903-1239
SC-33.2 Biological Systems Science Division, BER
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