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

BER Research Highlights


Diversion of Lignin Precursor Reduces Content and Improves Biomass Saccharification Efficiency
Published: January 13, 2015
Posted: April 01, 2015

Lignin confers recalcitrance to plant biomass used for producing biofuels and bioproducts. The metabolic steps for the synthesis of lignin building blocks belong to the shikimate and phenylpropanoid pathways. Genetic engineering efforts to reduce lignin content typically have employed gene knockout or gene silencing techniques to constitutively repress one of these metabolic pathways. Recently, researchers at the Department of Energy’s Joint BioEnergy Institute (JBEI) employed a new strategy using gain of function. In this method, expression of a 3-dehydroshikimate dehydratase (QsuB from Corynebacterium glutamicum) was targeted to the plastids of Arabidopsis to convert 3-dehydroshikimate—an intermediate of the shikimate pathway—into protocatechuate. This enzymatic conversion diverted lignin precursor into protocatechuate and related molecules and away from lignin precursors. Compared to wild-type plants, Arabidopsis lines expressing QsuB contained reduced levels of lignin deposition in the cell walls. Because this strategy is a gain of function, its expression can be controlled by selective promoters, thus offering better spatiotemporal control of lignin deposition than the gene knockout or gene silencing strategies. Finally, biomass from these engineered Arabidopsis lines exhibits more than a twofold improvement in saccharification efficiency. This result confirms that QsuB expression in plants, in combination with specific promoters, is a promising gain-of-function strategy for spatiotemporal reduction of lignin in plant biomass.

Reference: Eudes, A., N. Sathitsuksanoh, E. E. Baidoo, A. George, Y. Liang, F. Yang, S. Singh, J. D. Keasling, B. A. Simmons, and D. Loqué. 2015. “Expression of a Bacterial 3-Dehydroshikimate Dehydratase Reduces Lignin Content and Improves Biomass Saccharification Efficiency,” Plant Biotechnology Journal, DOI: 10.1111/pbi.12310. (Reference link)

Contact: Kent Peters, SC-23.2, (301) 903-5549
Topic Areas:

  • Research Area: Genomic Analysis and Systems Biology
  • Research Area: Microbes and Communities
  • Research Area: Plant Systems and Feedstocks, Plant-Microbe Interactions
  • Research Area: Sustainable Biofuels and Bioproducts
  • Research Area: DOE Bioenergy Research Centers (BRC)
  • Research Area: Biosystems Design

Division: SC-23.2 Biological Systems Science Division, BER

 

BER supports basic research and scientific user facilities to advance DOE missions in energy and environment. More about BER

Recent Highlights

Aug 24, 2019
New Approach for Studying How Microbes Influence Their Environment
A diverse group of scientists suggests a common framework and targeting of known microbial processes [more...]

Aug 08, 2019
Nutrient-Hungry Peatland Microbes Reduce Carbon Loss Under Warmer Conditions
Enzyme production in peatlands reduces carbon lost to respiration under future high temperatures. [more...]

Aug 05, 2019
Amazon Forest Response to CO2 Fertilization Dependent on Plant Phosphorus Acquisition
AmazonFACE Model Intercomparison. The Science Plant growth is dependent on the availabi [more...]

Jul 29, 2019
A Slippery Slope: Soil Carbon Destabilization
Carbon gain or loss depends on the balance between competing biological, chemical, and physical reac [more...]

Jul 15, 2019
Field Evaluation of Gas Analyzers for Measuring Ecosystem Fluxes
How gas analyzer type and correction method impact measured fluxes. The Science A side- [more...]

List all highlights (possible long download time)