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Zymomonas with improved ethanol production in medium containing concentrated sugars and acetate

United States Patent

March 1, 2011
View the Complete Patent at the US Patent & Trademark Office
National Renewable Energy Laboratory - Visit the NREL Technology Transfer Website
Through screening of a Zymomonas mutant library the himA gene was found to be involved in the inhibitory effect of acetate on Zymomonas performance. Xylose-utilizing Zymomonas strains further engineered to reduce activity of the himA gene were found to have increased ethanol production in comparison to a parental strain, when cultured in mixed-sugars medium comprising xylose, and, in particular, in the presence of acetate.
Caimi; Perry G. (Kennett Square, PA), Chou; Yat-Chen (Lakewood, CO), Franden; Mary Ann (Centennial, CO), Knoke; Kyle (Newark, DE), Tao; Luan (Havertown, PA), Viitanen; Paul V. (West Chester, PA), Zhang; Min (Lakewood, CO), Zhang; Yuying (New Hope, PA)
E.I. du Pont de Nemours and Company (Wilmington, DE), Alliance for Sustainable Energy LLC (
12/ 261,160
October 30, 2008
STATEMENT OF GOVERNMENT RIGHTS This invention was made with United States Government support under Contract No. 04-03-CA-70224 awarded by the Department of Energy and Contract No. DE-AC36-08GO28308 between the United States Department of Energy and the Alliance for Sustainable Energy, LLC, the Manager and Operator of the National Renewable Energy Laboratory. The U.S. Government has certain rights in this invention.