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E. coli bacteria engineered to eat switchgrass and make transportation fuels
Date:11/29/2011

for advanced biofuels.

Gregory Bokinsky, a post-doctoral researcher with JBEI's synthetic biology group and lead author of the PNAS paper, explains that the pre-treatment of the switchgrass with ionic liquids was essential to this demonstration.

"The magic is in the ionic liquid pre-treatment," Bokinsky says. "If properly optimized, I suspect you could use ionic liquid pre-treatment on any plant biomass and make it readily digestible by microbes. For us it was the combination of biomass from the ionic liquid pretreatment with the engineered E. coli that enabled our success."

The JBEI researchers also attribute the success of this work to the "unparalleled genetic and metabolic tractability" of E. coli, which over the years has been engineered to produce a wide range of chemical products. However, the researchers believe that the techniques used in this demonstration should also be readily adapted to other microbes. This would open the door to the production of advanced biofuels from lignocellulosic feedstocks that are ecologically and economically appropriate to grow and harvest anywhere in the world. For the JBEI researchers, however, the next step is to increase the yields of the fuels they can synthesize from switchgrass.

"We already have hydrocarbon fuel production pathways that give far better yields than what we obtained with this demonstration," says Bokinsky. "And these other pathways are very likely to be compatible with the biomass-consumption pathways we've engineered into our E. coli. However, we need to find enzymes that can both digest more of the ionic liquid pre-treated biomass and be secreted by E coli. We also need to work on optimizing the ionic liquid pre-treatment steps to yield biomass that is even easier for the microbes to digest."


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Contact: Lynn Yarris
lcyarris@lbl.gov
510-486-5375
DOE/Lawrence Berkeley National Laboratory
Source:Eurekalert  

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