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Sandia National Labs Developing Optimized Enzymes from Extremeophile for Production of Cellulosic Ethanol

12 June 2007

Sulfolobus
Sulfolobus solfataricus.

Researchers at Sandia National Laboratories are using an extremeophile—a microorganism that lives in extreme environmental conditions—as the basis for developing optimized enzymes to pre-process cellulosic biomass cheaply and efficiently for the production of cellulosic ethanol.

Sandia’s current biological object of interest is Sulfolobus solfataricus, a thermoacidophilic (heat- and acid-loving) archaeon whose extreme enzymes were isolated and discovered in 1980 by the German researcher Georg Lipps. Sulfolobus lives in and around volcanic springs (sulfurous caldrons) and metabolizes sulfur to sulfuric acid.

Sulfolobus expresses three cellulase-type enzymes that efficiently break down cellulose into sugars. Sandia’s target is an endoglucanase (SSO 1949).

Pre-processing of cellulosic biomass to breakup the lignocellulosic material into easily converted polymers is one of the current barriers to the cost effective production of cellulosic ethanol.

[Biomass] production is not a concern. More than a billion tons of biomass is estimated to be created each year in the timber and agricultural industries, as well as a variety of grasses and potential energy crops. Unfortunately, you can’t just take a tree trunk, stick it into an enzymatic reactor, and ferment the sugar produced into ethanol with any kind of efficiency. The process of turning certain lignocellulosic materials into ethanol is very difficult and costly.

—Blake Simmons, Sandia National Laboratory

Correspondingly, the search for better pre-processing techniques and enzymes is one of the major areas of concentration in R&ampD for cellulosic ethanol. One of the challenges is the acidity and temperature of the bioreactor production environment.

Instead of trying to create an extremozyme from sources that live in rather benign environmental conditions, why not just manipulate a real one isolated from its natural state?

—Blake Simmons

Sandia is applying a technique called “site-directed mutagenesis” to manipulate and optimize the Sulfolobus sequence that expresses the cellulase enzymes in hopes of improving performance. These mutations are identified using computational modeling techniques at Sandia that compare the structure and sequence of the extremozymes with their more benign counterparts to identify key genetic sequences of interest.

The ultimate dream—and it’s only a dream right now—would be to take a poplar tree, put it into a tank, let it sit for three days, then come back and watch as the ethanol comes pouring out of the spigot. Though we’re probably decades away from that, this project aims to consolidate the pretreatment steps and get us one step closer to realizing that vision.

—Blake Simmons

Simmons’ team has demonstrated increased enzyme activity of a recombinant SSO 1949 enzyme under thermoacidophilic conditions (pH 1.8 at 80°C) as compared to established enzymes. The computational tools the team developed will help identify candidate modifications to the genetic sequence to improve performance.

Next steps are to increase the purification and activity analysis of SSO 1949 mutants, analyze mutants for increased activity and then develop techniques for the directed evolution of SSO 1949.

The team will also expand its work to include other enzymes, and develop other expression systems for the enzymes.

Simmons presented his team’s preliminary findings from the extremeophile project recently at the 4th World Congress on Industrial Biotechnology & Bioprocessing. The team hopes to publish more advanced findings soon and is finalizing several proposals that could lead to further funding. The lab would be open, Simmons said, to conducting collaborative R&D with other commercial partners or research entities, or to licensing its research capabilities.

This and other efforts at Sandia National Laboratories are expected to be a component of the Joint Bio-Energy Institute (JBEI), a multi-lab/university effort to bring a Department of Energy-funded bio-research facility to the San Francisco Bay Area.

Resources:

  • “Development of Novel Endoglucanases Isolated from Thermoacidophiles” (presentation at 4th Annual World Congress on Industrial Biotechnology and Bioprocessing)

June 12, 2007 in Biotech, Cellulosic ethanol | Permalink | Comments (6) | TrackBack (0)

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Comments

Why doesn't someone just take CO2 + H2O + genetically engineered microorganisms = BioFuels.

Greener Jet Fuel

http://www.technologyreview.com/Biotech/18842/

OttoV, its called algae and they are working on it.

cellulosic ethanol is not decades way, even single stage reactors were you put in your cellulose (pre-mulched) and out comes diluted ethanol is not the far away.

Ben,
Algae lab projects don't cut it. Who is going to spend the $ billions to develop this idea and how many acres (millions) will be needed for these algae farms? Anyway, a company called Virent is working on a technology that can use sugar to produce green fuels without the buggies or algae right now. They just need cheap a source of sugar to make it work. http://www.virent.com/

I never said I supported algea it’s just that the only microbiological way of converting CO2 and H2O into biofuels, unless you can find an organism that can suck energy out of something other then solar, perhaps a Microbial Fuel Cell in reverse but that would require electricity. There are lots of companies using sugar to make biofuels in fact that what the ethanol industry is about.

In all this effort to change cellulose into a sugar/starch on the way to ethanol fuel overlooks a tremendous unrecognized side effect.

The World's food supply would increase by a tremendous amount, for non ruminants. Do you have a hungry population? Why simply feed them the local forest!

Talk about an unheralded Green Revolution. (Or if you prefer the dark side, the coming of a Soylent Green)

In the long term it will be seen as totally stupid to take complex bio-organics and degrade them into a replacement fuel. It will always be expensive and in the long run, self defeating.

The Electrification of Ground Transport that is coming at us swiftly, will make it an academic answer to a question to which no one needs an answer.

Well stan we could just eat less meat and shuttle all that fodder into making fuel and plastics, combined with EVs and other alternative sources of energy I'll put a good bet that americans will still be grossly overweight for decades to come.

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