U.S. Department of Energy Office of Biological and Environmental Research

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One-Stop “Shopping” for Biofuels: A Breakthrough in Consolidated Bioprocessing
Published: March 07, 2011
Posted: March 17, 2011

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
Topic Areas:

  • Research Area: Microbes and Communities
  • Research Area: Plant Systems and Feedstocks
  • Research Area: DOE Bioenergy Research Centers (BRC)
  • Research Area: Biological Engineering
  • Mission Science: Sustainable Biofuels

Division: SC-23.2 Biological Systems Science Division, BER


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