Tagged: Biofuels Toggle Comment Threads | Keyboard Shortcuts

  • richardmitnick 12:26 pm on August 8, 2016 Permalink | Reply
    Tags: , Biofuels, , MITEI   

    From MITEI at MIT: “Microbial engineering technique could reduce contamination in biofermentation plants” 

    MIT News
    MIT News
    MIT Widget

    1

    August 4, 2016
    Helen Knight

    Approach could lower cost and eliminate need for antibiotics during biofuel production.

    2
    The ability to ferment low-cost feedstocks under nonsterile conditions may enable new classes of biochemicals and biofuels, such as microbial oil produced by the yeast Yarrowia lipolytica (shown here, oil in lipid bodies is stained green and cells walls stained blue). Photo: Novogy, Inc.

    The cost and environmental impact of producing liquid biofuels and biochemicals as alternatives to petroleum-based products could be significantly reduced, thanks to a new metabolic engineering technique.

    Liquid biofuels are increasingly used around the world, either as a direct “drop-in” replacement for gasoline, or as an additive that helps reduce carbon emissions.

    The fuels and chemicals are often produced using microbes to convert sugars from corn, sugar cane, or cellulosic plant mass into products such as ethanol and other chemicals, by fermentation. However, this process can be expensive, and developers have struggled to cost-effectively ramp up production of advanced biofuels to large-scale manufacturing levels.

    One particular problem facing producers is the contamination of fermentation vessels with other, unwanted microbes. These invaders can outcompete the producer microbes for nutrients, reducing yield and productivity.

    Ethanol is known to be toxic to most microorganisms other than the yeast used to produce it,Saccharomyces cerevisiae, naturally preventing contamination of the fermentation process. However, this is not the case for the more advanced biofuels and biochemicals under development.

    To kill off invading microbes, companies must instead use either steam sterilization, which requires fermentation vessels to be built from expensive stainless steels, or costly antibiotics. Exposing large numbers of bacteria to these drugs encourages the appearance of tolerant bacterial strains, which can contribute to the growing global problem of antibiotic resistance.

    Now, in a paper published today in the journal Science, researchers at MIT and the Cambridge startup Novogy describe a new technique that gives producer microbes the upper hand against unwanted invaders, eliminating the need for such expensive and potentially harmful sterilization methods.

    The researchers engineered microbes, such as Escherichia coli, with the ability to extract nitrogen and phosphorous — two vital nutrients needed for growth — from unconventional sources that could be added to the fermentation vessels, according to Gregory Stephanopoulos, the Willard Henry Dow Professor of Chemical Engineering and Biotechnology at MIT, and Joe Shaw, senior director of research and development at Novogy, who led the research.

    What’s more, because the engineered strains only possess this advantage when they are fed these unconventional chemicals, the chances of them escaping and growing in an uncontrolled manner outside of the plant in a natural environment are extremely low.

    “We created microbes that can utilize some xenobiotic compounds that contain nitrogen, such as melamine,” Stephanopoulos says. Melamine is a xenobiotic, or artificial, chemical that contains 67 percent nitrogen by weight.

    Conventional biofermentation refineries typically use ammonium to supply microbes with a source of nitrogen. But contaminating organisms, such as Lactobacilli, can also extract nitrogen from ammonium, allowing them to grow and compete with the producer microorganisms.

    In contrast, these organisms do not have the genetic pathways needed to utilize melamine as a nitrogen source, says Stephanopoulos.

    “They need that special pathway to be able to utilize melamine, and if they don’t have it they cannot incorporate nitrogen, so they cannot grow,” he says.

    The researchers engineered E. coli with a synthetic six-step pathway that allows it to express enzymes needed to convert melamine to ammonia and carbon dioxide, in a strategy they have dubbed ROBUST (Robust Operation By Utilization of Substrate Technology).

    When they experimented with a mixed culture of the engineered E. coli strain and a naturally occurring strain, they found the engineered type rapidly outcompeted the control, when fed on melamine.

    They then investigated engineering the yeast Saccharomyces cerevisiae to express a gene that allowed it to convert the nitrile-containing chemical cyanamide into urea, from which it could obtain nitrogen.

    The engineered strain was then able to grow with cyanamide as its only nitrogen source.

    Finally, the researchers engineered both S. cerevisiae and the yeast Yarrowia lipolytica to use potassium phosphite as a source of phosphorous.

    Like the engineered E. coli strain, both the engineered yeasts were able to outcompete naturally occurring strains when fed on these chemicals.

    “So by engineering the strains to make them capable of utilizing these unconventional sources of phosphorous and nitrogen, we give them an advantage that allows them to outcompete any other microbes that may invade the fermenter without sterilization,” Stephanopoulos says.

    The microbes were tested successfully on a variety of biomass feedstocks, including corn mash, cellulosic hydrolysate, and sugar cane, where they demonstrated no loss of productivity when compared to naturally occurring strains.

    The paper provides a novel approach to allow companies to select for their productive microbes and select against contaminants, according to Jeff Lievense, a senior engineering fellow at the San Diego-based biotechnology company Genomatica who was not involved in the research.

    “In theory you could operate a fermentation plant with much less expensive equipment and lower associated operating costs,” Lievense says. “I would say you could cut the capital and capital-related costs [of fermentation] in half, and for very large-volume chemicals, that kind of saving is very significant,” he says.

    The ROBUST strategy is now ready for industrial evaluation, Shaw says. The technique was developed with Novogy researchers, who have tested the engineered strains at laboratory scale and trials with 1,000-liter fermentation vessels, and with Felix Lam of the MIT Whitehead Institute for Biomedical Research, who led the cellulosic hydrosylate testing.

    Novogy now hopes to use the technology in its own advanced biofuel and biochemical production, and is also interested in licensing it for use by other manufacturers, Shaw says.

    See the full article here .

    Please help promote STEM in your local schools.

    STEM Icon

    Stem Education Coalition

    MIT Seal

    The mission of MIT is to advance knowledge and educate students in science, technology, and other areas of scholarship that will best serve the nation and the world in the twenty-first century. We seek to develop in each member of the MIT community the ability and passion to work wisely, creatively, and effectively for the betterment of humankind.

    MIT Campus

     
  • richardmitnick 8:36 am on July 1, 2016 Permalink | Reply
    Tags: , Biofuels,   

    From BNL: “Study Shows Trees with Altered Lignin are Better for Biofuels” 

    Brookhaven Lab

    June 28, 2016
    Karen McNulty Walsh
    (631) 344-8350
    kmcnulty@bnl.gov

    Peter Genzer
    (631) 344-3174
    genzer@bnl.gov

    Fundamental enzyme study leads to increased access to bioenergy feedstocks and improves ethanol yield by modifying plant cell wall structures.

    1
    Postdoctoral associate Yuanheng Cai, biological research associate Xuebin Zhang, and plant biochemist Chang-Jun Liu in the Brookhaven Lab greenhouse with transgenic trees designed to improve biofuel production.

    Lignin is a natural component of plant cell walls, the scaffolding that surrounds each cell and plays a pivotal role in plants’ ability to grow against gravity and reach heights ranging from stubbly grasses to the sky-scraping splendor of redwoods. But lignin is a problem for scientists interested in converting plant biomass to biofuels and other sustainable bio-based products. Lignin makes it hard to break down the plant matter so its carbon-rich building blocks can be converted into forms suitable for generating energy or running automobiles.

    A simple solution might be to engineer plants with less lignin. But previous attempts to do this have often resulted in weaker plants and stunted growth—essentially putting the brakes on biomass production.

    Now, by engineering a novel enzyme involved in lignin synthesis, scientists at the U.S. Department of Energy’s Brookhaven National Laboratory and collaborators have altered the lignin in aspen trees in a way that increases access to biofuel building blocks without inhibiting plant growth. Their research, described in Nature Communications, resulted in an almost 50 percent increase in ethanol yield from healthy aspen trees whose woody biomass released 62 percent more simple sugars than native plants.

    “Our study provides a useful strategy for tailoring woody biomass for bio-based applications,” said Brookhaven biologist Chang-Jun Liu, the lead author on the project.

    Lignin makes up about 20 percent of aspen’s woody structures, with cellulose and hemicellulose polymers making up approximately 45 and 25 percent, along with other minor components.

    “The lignin forms a barrier of sorts around the other polymers,” Liu explained. “Digestive enzymes can’t get through to break down the cellulose and hemicellulose to release their simple sugars.”

    Prior work, including Liu’s own research manipulating enzymes involved in lignin synthesis, has shown that reducing or altering plants’ lignin content can make woody biomass more digestible. But many of these approaches, particularly those that dramatically reduced lignin content, resulted in weaker plants and severe reductions in biomass yield, rendering these plants unsuitable for large-scale cultivation.

    In this study the scientists explored a creative new strategy for modifying lignin’s structure based on detailed analysis of enzyme structures that were previously solved by Liu’s group using x-rays at the National Synchrotron Light Source (NSLS)—a DOE Office of Science User Facility at Brookhaven Lab, now replaced by a much brighter NSLS-II.

    BNL NSLS Interior
    NSLS

    BNL NSLS-II Interior
    NSLS-II

    That work, described in papers published in Plant Cell (2012) and the Journal of Biological Chemistry (2010 and 2015), was part of an effort to understand the enzymes’ mechanism of selectivity. In those studies, the scientists also sought to engineer a series of variations of the enzyme, called monolignol 4-O-methyltransferase, some of which effectively modified the structure of lignin building blocks so they would no longer be incorporated into the lignin polymer.

    2
    Cross-sections of wild type (a,c) and transgenic (b,d) aspen stems stained with lignin detection agents. The violet red color in the upper images indicates no dramatic change in total lignin content between the wild type (a) and transgenic (b) plants. The red color staining specific for one particular lignin structural unit shown in the lower images, however, indicates a significantly lower level of this component in the transgenic aspen (d) compared with the wild type (c). These findings suggest that lignin in the transgenic aspen has significantly altered composition and structure.

    In the new work, the scientists used biochemical analyses to identify a variant of monolignol 4-O-methyltransferase that had a slight chemical “preference” for reacting with one specific type of lignin precursor. The scientists reasoned that this variant had the potential to depress the formation of a particular lignin component.

    To test this idea, they transplanted the gene for this variant into a strain of fast-growing aspen trees—a model for other trees in the poplar family, which have widespread potential for bioenergy production because of their ability to grow in many regions and on non-agricultural land. The scientists grew the altered aspen trees alongside untreated control trees in a greenhouse on Brookhaven’s property.

    Modified cell walls, more sugar

    The trees that produced the engineered enzyme had slightly less total lignin in their cell walls. But on further analysis, the scientists found that these trees also had dramatically altered lignin structure, with a significant reduction in the level of one of the two major types of lignin components normally found in aspen trees. These findings were further confirmed using two-dimensional nuclear magnetic resonance spectroscopic imaging by a team led by John Ralph of the University of Wisconsin and the Great Lakes Bioenergy Research Center, a DOE Bioenergy Research Center. Specifically, the engineered trees had less “labile” lignin, while the remaining lignin components became structurally more condensed, forming an increased number of cross-linkages among the polymers.

    “We expected that this condensed, more cross-linked lignin might make the plants even harder to digest, but found that wood containing these structures released up to 62 percent more simple sugars when treated with digestive enzymes,” Liu said. The yield of ethanol from this modified wood was almost 50 percent higher than the ethanol yield of wood derived from untreated control trees.

    3
    Microscopic images of wood tissues from wild type (a) and transgenic (b) aspen trees show similar anatomical and structural features, suggesting that the transgenic plant maintains normal growth and wood formation even with altered lignin composition.

    Interestingly, by imaging aspen wood samples using infrared light at NSLS, the scientists found that their approach for altering lignin content and composition also increased the production of cellulose fibers, the major source of fermentable sugars in the cell wall. This increased cellulose content might partially contribute to the increased release of simple sugars, they said.

    Importantly, the changes in lignin and cell wall structures did not affect the growth of the engineered aspens. The wood densities and the biomass yields were comparable to those of the control trees.

    “These data suggest that lignin condensation itself is not a critical factor affecting the digestibility of the cell wall,” said Liu. “The findings also support the idea that engineering the enzymes that modify lignin precursors represents a useful biotechnological solution for effectively tailoring the digestibility of poplar-family woody biomass to generate feedstocks for biofuel production.

    “It’s gratifying when fundamental studies of enzyme function, such as the findings that underpin this work, can be translated to contribute to solving real-world problems,” he added.

    This work was supported by the DOE Office of Science.

    See the full article here .

    Please help promote STEM in your local schools.

    STEM Icon

    Stem Education Coalition
    BNL Campus

    One of ten national laboratories overseen and primarily funded by the Office of Science of the U.S. Department of Energy (DOE), Brookhaven National Laboratory conducts research in the physical, biomedical, and environmental sciences, as well as in energy technologies and national security. Brookhaven Lab also builds and operates major scientific facilities available to university, industry and government researchers. The Laboratory’s almost 3,000 scientists, engineers, and support staff are joined each year by more than 5,000 visiting researchers from around the world.Brookhaven is operated and managed for DOE’s Office of Science by Brookhaven Science Associates, a limited-liability company founded by Stony Brook University, the largest academic user of Laboratory facilities, and Battelle, a nonprofit, applied science and technology organization.
    i1

     
  • richardmitnick 11:32 am on June 9, 2016 Permalink | Reply
    Tags: , Biofuels, Chemistry lessons from bacteria may improve biofuel production,   

    From Wisconsin: “Chemistry lessons from bacteria may improve biofuel production” 

    U Wisconsin

    University of Wisconsin

    June 8, 2016
    Chris Barncard

    If you’re made of carbon, precious few things are as important to life as death.

    A dead tree may represent a literal windfall of the building blocks necessary for making new plants and animals and the energy to sustain them.

    “The recycling of plant carbon is fundamental to the function of our ecosystems,” says Cameron Currie, professor of bacteriology at the University of Wisconsin–Madison. “We get food, water, air, energy — almost everything — through those ecosystem services. It’s how our planet operates.”

    But the component parts of a dead tree were carefully assembled in the first place, and don’t just fall apart for easy recycling.

    1
    The ability to break down the cellulose in plant material is rare in Streptomyces bacteria, except in strains that live alongside insects — honeybees, leaf-cutter ants (above), some beetles —that eat or make use of the woody parts of plants. Courtesy of Don Parsons/UW-Madison

    In the case of cellulose — a key structural component in plant cell walls and the most abundant organic compound in life on land — a world of specialized microbes handles this careful deconstruction. Much of that work is done by fungi growing on decaying plants, but bacteria in the soil, in the guts of animals like cows and working alongside insects, get the job done, too.

    A new analysis of a group of bacteria called Streptomyces reveals the way some strains of the microbe developed advanced abilities to tear up cellulose, and points out more efficient ways we might mimic those abilities to make fuel from otherwise unusable plant material.

    Streptomyces were long thought to be prominent contributors at work in breaking down cellulose, and to be equally active in the cause across hundreds or thousands of strains of the bacteria.

    2
    Researchers tried to grow different strains of Streptomyces bacteria on dead plant material (in this case, filter paper). Successful cellulose processing strains tapped special genes to produce enzymes that break down cellulose. Courtesy of Currie Lab/UW-Madison

    “The strains that aren’t good at degrading cellulose mostly express the same genes whether we grow them on glucose or on plant material,” says Gina Lewin, a bacteriology graduate student and study co-author. “The strains that are really good at degrading cellulose totally change their gene expression when we grow them on plant material.”

    The successful Streptomyces strains — which were typically those found living in communities with insects — ramp up production of certain enzymes, the proteins that do the cleaving and dissolving and picking apart of cellulose.

    “There are families — six or eight or maybe 10 of these enzymes — that all of the active Streptomyces have,” Fox says. “And this paper shows that the most abundant one of them has to be there or the whole thing collapses.”

    It’s the particular combinations of enzymes that makes the research useful to scientists working on biofuels.

    4
    Counter to long-held belief about the bacteria Streptomyces, seen growing here in a petri dish, the ability to break down a stubborn molecule in plant cell walls called cellulose may be limited to just a few gifted strains. Courtesy of Adam Book/UW-Madison

    Biofuels are typically made from the sugars easily extracted from the same parts of plants we eat.

    “We eat the kernels off the corn cob,” Currie says. “But most of the energy in that corn plant is in the part which is not digestible to us. It’s not in the cob. It’s in the green parts, like the stalk and the leaves.”

    Evolving microbes like Streptomyces have been sharpening the way they make use of those parts of plants almost as long as the plants themselves have been growing on land. That’s hundreds of millions of years. On the other hand, the Department of Energy’s UW–Madison-based Great Lakes Bioenergy Research Center, which funded the Streptomyces study, was established in 2007.

    “The natural world is responding to the same kind of things that humans are,” Fox says. “We need to get food. We need to get energy. And different types of organisms are achieving their needs in different ways. It’s worth looking at how they do it.”

    The new study identifies important enzymes, and new groups of enzymes, produced when Streptomyces flex particular genes. If they represent an improvement over current industrial processes, the microbes’ tricks could make for a great boon to bioenergy production.

    “For a cellulosic biofuel plant, enzymes are one of the most expensive parts of making biofuels,” Lewin says. “So, if you can identify enzymes that work even just slightly better, that could mean a difference of millions of dollars in costs and cheaper energy.”

    See the full article here .

    Please help promote STEM in your local schools.

    STEM Icon

    Stem Education Coalition

    In achievement and prestige, the University of Wisconsin–Madison has long been recognized as one of America’s great universities. A public, land-grant institution, UW–Madison offers a complete spectrum of liberal arts studies, professional programs and student activities. Spanning 936 acres along the southern shore of Lake Mendota, the campus is located in the city of Madison.

     
  • richardmitnick 7:40 am on March 31, 2016 Permalink | Reply
    Tags: , Biofuels, Ee-Been Goh, , woman scientist   

    From LBL: “From Near-Dropout to PhD, Berkeley Lab Scientist Now at Forefront of Biofuels Revolution” 

    Berkeley Logo

    Berkeley Lab

    March 30, 2016
    Julie Chao
    (510) 486-6491
    JHChao@lbl.gov

    1
    Ee-Been Goh works with summer intern Joshua Borrajo in 2013. (Credit: Roy Kaltschmidt/Berkeley Lab)

    To see biochemist Ee-Been Goh in the lab today, figuring out how to rewire bacteria to produce biofuels, one would never guess she was once so uninterested in school that she barely made it through junior high.

    “My mom would say, ‘You used to be the worst in school—why would you want to go for more school?’” Goh said. “That was the joke when I was going into grad school.”

    Today Goh is a project scientist at the Joint BioEnergy Institute (JBEI), a Department of Energy Bioenergy Research Center led by Lawrence Berkeley National Laboratory (Berkeley Lab). She has been lead author on two important publications on methyl ketones, a compound found in blue cheese that has also turned out be one of the most promising and high-performing biofuels at JBEI.

    Her path into science is an object lesson she likes to share with the high school students she mentors through a JBEI summer program called Introductory College Level Experience in Microbiology (iCLEM). “I always tell the iCLEM kids how I was a terrible student in Singapore,” she said. “I was a tomboy, and I just loved goofing off on the streets and playing sports. I really hated school. I would’ve loved to have had a career in professional sports.”

    At the age of 14, her parents moved the entire family to Vancouver, largely for a better educational experience for Goh and her two sisters. Getting to do hands-on science activities in high school, such as animal dissections, sparked her interest in science. “When you do it yourself, you understand things a lot better than when you’re being bombarded with words on a board or an overhead projector,” she said. “That’s something that really caught on for me.”

    Likewise, she encourages students to take advantage of any opportunity they might have. “I think some of these students get really dejected when they don’t do well in school, and as you get more dejected, you just don’t want to put in any more effort,” she said. “That’s how I felt when I was a little kid. The most important thing for me is to fan their interest.”

    As an undergrad at the University of British Columbia, her opportunity was an internship in the microbiology lab of Julian Davies, a renowned scientist in the field of antibiotics and drug resistance. “He was retired and in his 70s, but he really loved science so he was still taking on undergrad students who liked to do research,” she said. “He was very hands-on and got very excited even with small results, and it got me excited too.”

    With encouragement from Davies, Goh decided to pursue an advanced career in science. She did her graduate work in microbiology at UC Davis, where her research focused on understanding how bacteria communicate with each other. This work in the basic sciences taught Goh useful research techniques, but she realized she wanted to pursue a career in the applied sciences.

    “With applied science it impacts more people and has broader reach,” she said. “People can take it and use it. That’s what science is about, right?”

    Landing a job at JBEI fit that requirement perfectly.

    From blue cheese to climate change

    “Many valuable commodity chemicals and fragrances are often derived from petroleum,” Goh said. “At JBEI we’re aiming not just to make biofuels but also to replace a lot of everyday products that come from that barrel of crude oil. We’re trying to do our part in slowing down climate change—that’s the ultimate goal.”

    The focus of her research has been methyl ketones, which are derived from fatty acids and show great promise for biodiesel fuels. Not only are methyl ketones a potential biodiesel, there is a market for these compounds as flavors and fragrances. Working with Harry Beller, director of Biofuels Pathways at JBEI, Goh’s research is aimed at engineering E. coli bacteria to produce methyl ketones as efficiently as possible.

    “Ee-Been has made significant scientific contributions to the development of new biofuels at JBEI,” Beller said. “Her two first-author publications on engineering and optimizing a novel methyl ketone pathway in E. coli have made a notable impact in the area of fatty acid-derived biofuels—medium-chain methyl ketones are among our best performing biofuels at JBEI.”

    Beller elaborated on what made Goh good at what she does: “Qualities that have helped Ee-Been be a successful scientist are her persistence and intelligent approach to troubleshooting. In biotechnology, as in many areas of science and technology, only a fraction of scientific avenues we follow lead to clear success. Ee-Been has the fortitude and ability to learn from things that didn’t work to eventually pursue things that do.”

    And although she occasionally likes to pull pranks in the lab—switching out medium-sized gloves for small ones is a perennial favorite—her JBEI colleagues have voted her “JBEI Citizen” for two consecutive years for “fostering a positive working environment through helping colleagues.”

    “Perhaps Ee-Been’s most lasting legacy at JBEI is all the people she has helped along the way,” Beller said. “She’s been very generous with her time, including ongoing involvement in the iCLEM summer internship program for economically disadvantaged high-school students.”

    See the full article here .

    Please help promote STEM in your local schools.

    STEM Icon

    Stem Education Coalition

    A U.S. Department of Energy National Laboratory Operated by the University of California

    University of California Seal

    DOE Seal

     
  • richardmitnick 10:53 am on February 3, 2016 Permalink | Reply
    Tags: , Biofuels, ,   

    From Sandia: “Algae raceway paves path from lab to real-world applications” 


    Sandia Lab

    February 2, 2016
    Patti Koning
    pkoning@sandia.gov
    (925) 294-4911

    Sandia algae raceway testing facility

    In a twist of geometry, an oval can make a line. The new algae raceway testing facility at Sandia National Laboratories may be oval in shape, but it paves a direct path between laboratory research and solving the demand for clean energy.

    As the nation and California adopt policies to promote clean transportation fuels, that path could help bring the promise of algal biofuels closer to reality. As one of the fastest growing organisms on the planet, algae are an ideal source of biomass, but researchers have not yet found a cost-competitive way to use algae for fuels.

    “This facility helps bridge the gap from the lab to the real world by giving us an environmentally controlled raceway that we can monitor to test and fine tune discoveries,” said Ben Wu, Sandia’s Biomass Science and Conversion Technology manager.

    “The success of moving technologies from a research lab to large outdoor facilities is tenuous. The scale-up from flask to a 150,000-liter outdoor raceway pond is just too big.”

    The new Sandia algae testing facility consists of three 1,000-liter raceway ponds with advanced monitoring provides new advantages to researchers:

    Easy scale-up to larger, outdoor raceways
    Customizable lighting and temperature controls, operational by year end, to simulate the conditions of locations across the country
    Fully contained for testing genetic strains and crop protection strategies
    Advanced hyperspectral monitoring 24 hours a day

    Several ongoing projects will use the algae raceway right away. Researchers Todd Lane and Anne Ruffing will test genetically modified algae strains as part of a project funded by Sandia’s Laboratory Directed Research and Development (LDRD) program. The algae raceway will allow the researchers to more quickly identify strains that promise improved performance.

    Lane is also part of a project partnership with Lawrence Livermore National Laboratory funded by the Department of Energy’s Bioenergy Technologies Office (BETO) that is investigating a probiotic approach to algae crop protection.

    Another BETO project seeks to convert algae proteins into useful chemical compounds such as butanol. Wu expects the facility will expand opportunities for Sandia researchers to develop algae as a robust source of biofuels and increase collaborations and partnerships with the private sector, particularly in California where efforts to transform transportation energy are prevalent.

    “The bioeconomy is gaining momentum,” he said. “Biofuels from algae may be further off, but algae has sugar and proteins that can make fuel or higher valued products, such as butanol or nylon — products that currently come from fossil fuels.”

    See the full article here .

    Please help promote STEM in your local schools.

    STEM Icon

    Stem Education Coalition

    Sandia Campus
    Sandia National Laboratory

    Sandia National Laboratories is a multiprogram laboratory operated by Sandia Corporation, a wholly owned subsidiary of Lockheed Martin Corporation, for the U.S. Department of Energy’s National Nuclear Security Administration. With main facilities in Albuquerque, N.M., and Livermore, Calif., Sandia has major R&D responsibilities in national security, energy and environmental technologies, and economic competitiveness.
    i1
    i2
    i3

     
  • richardmitnick 6:20 pm on January 4, 2016 Permalink | Reply
    Tags: , Biofuels, Indiana U   

    From IU: “IU scientists create ‘nano-reactor’ for the production of hydrogen biofuel” 

    Indiana U bloc

    Indiana University

    Jan. 4, 2016
    Kevin Fryling
    Office 812-856-2988
    kfryling@iu.edu

    Temp 1
    An artist’s rendering of P22-Hyd, a new biomaterial created by encapsulating a hydrogen-producing enzyme within a virus shell. | Photo by Trevor Douglas

    Temp 2
    Illustration showing the release of NiFe-hydrogenase from inside the virus shell, or “capsid,” of bacteriophage P22. | Photo by Trevor Douglas

    Scientists at Indiana University have created a highly efficient biomaterial that catalyzes the formation of hydrogen — one half of the “holy grail” of splitting H2O to make hydrogen and oxygen for fueling cheap and efficient cars that run on water.

    A modified enzyme that gains strength from being protected within the protein shell — or capsid — of a bacterial virus, this new material is 150 times more efficient than the unaltered form of the enzyme.

    The process of creating the material was recently reported in Self-assembling biomolecular catalysts for hydrogen production in the journal Nature Chemistry.

    “Essentially, we’ve taken a virus’s ability to self-assemble myriad genetic building blocks and incorporated a very fragile and sensitive enzyme with the remarkable property of taking in protons and spitting out hydrogen gas,” said Trevor Douglas, the Earl Blough Professor of Chemistry in the IU Bloomington College of Arts and Sciences’ Department of Chemistry, who led the study.

    3
    Trevor Douglas | Photo by Montana State University

    “The end result is a virus-like particle that behaves the same as a highly sophisticated material that catalyzes the production of hydrogen.”

    Other IU scientists who contributed to the research were Megan C. Thielges, an assistant professor of chemistry; Ethan J. Edwards, a Ph.D. student; and Paul C. Jordan, a postdoctoral researcher at Alios BioPharma, who was an IU Ph.D. student at the time of the study.

    The genetic material used to create the enzyme, hydrogenase, is produced by two genes from the common bacteria Escherichia coli, inserted inside the protective capsid using methods previously developed by these IU scientists. The genes, hyaA and hyaB, are two genes in E. coli that encode key subunits of the hydrogenase enzyme. The capsid comes from the bacterial virus known as bacteriophage P22.

    The resulting biomaterial, called “P22-Hyd,” is not only more efficient than the unaltered enzyme but also is produced through a simple fermentation process at room temperature.

    The material is potentially far less expensive and more environmentally friendly to produce than other materials currently used to create fuel cells. The costly and rare metal platinum, for example, is commonly used to catalyze hydrogen as fuel in products such as high-end concept cars.

    “This material is comparable to platinum, except it’s truly renewable,” Douglas said. “You don’t need to mine it; you can create it at room temperature on a massive scale using fermentation technology; it’s biodegradable. It’s a very green process to make a very high-end sustainable material.”

    In addition, P22-Hyd both breaks the chemical bonds of water to create hydrogen and also works in reverse to recombine hydrogen and oxygen to generate power. “The reaction runs both ways — it can be used either as a hydrogen production catalyst or as a fuel cell catalyst,” Douglas said.

    The form of hydrogenase is one of three occurring in nature: di-iron (FeFe)-, iron-only (Fe-only)- and nitrogen-iron (NiFe)-hydrogenase. The third form was selected for the new material due to its ability to easily integrate into biomaterials and tolerate exposure to oxygen.

    NiFe-hydrogenase also gains significantly greater resistance upon encapsulation to breakdown from chemicals in the environment, and it retains the ability to catalyze at room temperature. Unaltered NiFe-hydrogenase, by contrast, is highly susceptible to destruction from chemicals in the environment and breaks down at temperatures above room temperature — both of which make the unprotected enzyme a poor choice for use in manufacturing and commercial products such as cars.

    These sensitivities are “some of the key reasons enzymes haven’t previously lived up to their promise in technology,” Douglas said. Another is their difficulty to produce.

    “No one’s ever had a way to create a large enough amount of this hydrogenase despite its incredible potential for biofuel production. But now we’ve got a method to stabilize and produce high quantities of the material — and enormous increases in efficiency,” he said.

    The development is highly significant according to Seung-Wuk Lee, professor of bioengineering at the University of California-Berkeley, who was not a part of the study.

    “Douglas’ group has been leading protein- or virus-based nanomaterial development for the last two decades. This is a new pioneering work to produce green and clean fuels to tackle the real-world energy problem that we face today and make an immediate impact in our life in the near future,” said Lee, whose work has been cited in a U.S. Congressional report on the use of viruses in manufacturing.

    Beyond the new study, Douglas and his colleagues continue to craft P22-Hyd into an ideal ingredient for hydrogen power by investigating ways to activate a catalytic reaction with sunlight, as opposed to introducing elections using laboratory methods.

    “Incorporating this material into a solar-powered system is the next step,” Douglas said.

    This research was supported by the U.S. Department of Energy.

    See the full article here .

    Please help promote STEM in your local schools.

    STEM Icon

    Stem Education Coalition

    Indiana U Campus

    Indiana University students get it all—the storybook experience of what college should be like, and the endless opportunities that come with it. Top-ranked academics. Awe-inspiring faculty. Dynamic campus life. International culture. Phenomenal music and arts events. The excitement of IU Hoosier sports. And a jaw-droppingly beautiful campus.

     
  • richardmitnick 9:03 am on December 17, 2015 Permalink | Reply
    Tags: , , Biofuels,   

    From Sandia: “Sandia, ASU collaborate on algae computational modeling, look for algae pond predators” 


    Sandia Lab

    December 17, 2015
    Michael Padilla
    mjpadil@sandia.gov
    (925) 294-2447

    1
    Sandia National Laboratories researcher Jerilyn Timlin serves as a principal investigator for the Algal Predator and Pathogen Signature Verification project. (Photo by Randy Montoya)

    Work part of a broader framework for funding energy-related science, technology

    Sandia National Laboratories and Arizona State University (ASU) have teamed up to further improve computational models of algae growth in raceway ponds that can predict performance, improve pond design and operation and discover ways to improve algae yield outdoors.

    Such ponds consist of an oval-shaped closed-loop channel — or raceway — in which the cultivation mixture of water and algae is propelled to flow around the raceway and undergo mixing by a paddlewheel powered by an electric motor.

    In addition, Sandia and ASU will further develop spectroradiometric techniques to optically monitor the growth and health of algae pond cultivation in real-time and detect early warnings of predators and pathogens in outdoor algal ponds.

    The work is part of a newly signed Cooperative Research and Development Agreement (CRADA) between ASU and Sandia to collaborate on algae-based biofuels, solar fuels, concentrating solar technologies, photovoltaics, electric grid modernization and the energy-water nexus. The umbrella CRADA also covers international applications of the technologies and science and engineering education. The topics were first identified in a 2013 memo of understanding between Sandia and ASU focusing on collaborations to support science, technology, engineering and mathematics, or STEM, fields.

    This is the first CRADA Sandia has executed with a university in nearly 15 years and is currently the only active umbrella CRADA with an institution of higher education. The algae cultivation modeling and monitoring projects are the first two efforts funded under this umbrella CRADA.

    Sandia researcher Ron Pate said Sandia brings distinctive capabilities for physics-based modeling of algae cultivation systems performance and for remote spectroradiometric monitoring and diagnostics of algae growth and state of health, while ASU has a variety of algae species under cultivation in outdoor ponds in a range of scales in which to take measurements.

    “Sandia is excited about the collaboration with ASU,” Pate said. “This agreement allows Sandia to continue modeling and monitoring work that we have been pursuing with ASU since 2013 under the original ATP3 (Algae Testbed Public-Private Partnership) project.” Pate serves as deputy director for ATP3, overseeing Sandia technical tasks under the project.

    The ATP3 project was established to support the algae research and development community and industry to advance the field and help accelerate progress toward more rapid and successful commercialization of algae-based technologies for fuels and products. ATP3 is funded by the DOE’s Energy Efficiency and Renewable Energy Bioenergy Technologies Office. ATP3 partners include Sandia, ASU, the National Renewable Energy Laboratory, California Polytechnic State University in San Luis Obispo, the Georgia Institute of Technology in Atlanta and the algae companies San Diego-based Cellana Inc. with algae cultivation facilities in Kona, Hawaii, Commercial Algae Management in Franklin, North Carolina and Florida Algae in Vero Beach, Florida.

    Two projects exercise new Sandia, ASU CRADA

    The first project under the agreement, Algal Cultivation Growth Dynamic Modeling and Analysis, focuses on the further development of a Sandia algae growth model based on the effect of light, temperature, nutrients, pH and salinity integrated into an open raceway pond hydrodynamic computational fluid dynamics model. The algae growth model has been partially validated utilizing multiple data sets from partners involved in ATP3. Under the CRADA, the modeling will be further refined through improvement of the paddlewheel driven pond circulation flow and mixing portion of the model based on the application of hydrodynamic measurement data taken from experimental testing with progressively larger scale outdoor ponds operated by ATP3 partners.

    The 12-month project, led by principal investigators Patricia Gharagozloo from Sandia and John McGowen from ASU, will be conducted in two phases. The first phase will study the flow dynamics of turbulence models and control parameters in open raceway ponds, which are currently the most promising outdoor cultivation system approach for cost-effectively growing algae at the large scales required for producing fuels. In this phase, ASU will measure the spatial variations in velocity of the flow of algae-water mix in the ponds at various paddlewheel speeds.

    The second phase will calibrate the model and verify the appropriate turbulence physics to be accounted for at certain scales of ponds for one paddlewheel speed. After the two phases, a study will be conducted to compare the data with model results at additional paddlewheel speeds.

    The second 12-month project, Algal Predator and Pathogen Signature Verification, looks at exploring and exploiting the various detailed optical signatures that arise when the algae cultivation pond surface is monitored using Sandia’s optical spectroradiometric techniques. These techniques can differentiate algae growth and state of health and provide an early warning of the active presence of predators and pathogens in outdoor algal ponds. Sandia researcher Jerilyn Timlin and McGowen are the principal investigators for this project. Sandia researcher Tom Reichardt, who pioneered the original technology as part of a bioscience Laboratory Directed Research & Development project, also serves as technical contributor to the project.

    During the first phase of this project, controlled experiments will be conducted in the laboratory with a host-pathogen-predator pair that the team has seen cause problems in the field in order to understand the parameters that control culture collapse and identify spectral markers that indicate the presence of the pathogen or predator. The second phase will consist of experiments in the field to determine how well the identified spectral markers predict the presence of the pathogen or predator in the challenges of an outdoor environment.

    “The continuation of the technical work related to algae biofuels, which began under the ATP3 project, is a great opportunity to exercise this new Sandia-ASU CRADA,” Pate said. “However, collaborative work on the other STEM topic areas could also be pursued in the future as funding becomes available and the mutual interest exists at ASU and Sandia.”

    See the full article here .

    Please help promote STEM in your local schools.

    STEM Icon

    Stem Education Coalition

    Sandia Campus
    Sandia National Laboratory

    Sandia National Laboratories is a multiprogram laboratory operated by Sandia Corporation, a wholly owned subsidiary of Lockheed Martin Corporation, for the U.S. Department of Energy’s National Nuclear Security Administration. With main facilities in Albuquerque, N.M., and Livermore, Calif., Sandia has major R&D responsibilities in national security, energy and environmental technologies, and economic competitiveness.
    i1
    i2
    i3

     
  • richardmitnick 10:43 am on August 21, 2015 Permalink | Reply
    Tags: , Biofuels,   

    From EPFL: Using fungi to harvest microalgae for biofuels 

    EPFL bloc

    École Polytechnique Fédérale de Lausanne EPFL

    21.08.15
    No Writer Credit

    1
    Microalgae are a promising feedstock for biofuels, but current methods of harvesting and dewatering them are unsustainable. Now researchers have shown that growing the algae with certain filamentous fungi to form lichens can reduce both cost and the energy input.

    Biofuels produced using microalgae could play an important role in the transition from a fossil fuel-based to a sustainable economy. While researchers have optimized the transformation of microalgae into biogas, harvesting and drying the algae continue to consume too much energy, accounting for 20-30% of the cost of biofuel production. Now, scientists from EPFL and the Universities of the Western Cape and Stellenbosch in South Africa have come across a filamentous fungus that could cut the cost of biomass harvesting. They presented their findings in the journal Bioresource Technology in June.

    Burning biogas made from microalgae only releases as much carbon into the air as the algae absorb during their growth, making algal biogas a potential carbon neutral substitute for natural gas. Curiously, the bottleneck to making the technology competitive is not in the technologically challenging process of transforming the algae into biogas, a mixture of methane (CH4) and carbon dioxide (CO2). Researchers have solved this step using a highly efficient process called hydrothermal gasification as part of the SunCHem project . Instead, the bottleneck lies in the technologically much simpler step of harvesting the algae.

    Researchers Stephan Mackay and Eduardo Gomes may have serendipitously stumbled a potential solution to harvesting problem. When testing different types of microalgae, they noticed that in one of their samples, the algae lumped together into little pellets. Upon close investigation, they identified the culprit: a filamentous fungus, Isaria fumosorosea that had contaminated their samples. The pellets that they observed were in fact lichens, hybrid structures made up of algae and fungi. A few millimeters in diameter, the pellets are large enough to be harvested from the water with a simple filter, with much lower energy expenditure than conventional approaches such as drying and dewatering.

    According the Jean-Paul Schwitzguébel from EPFL’s Laboratory for Environmental Biotechnology and the principal investigator of the study, the next steps would be to assess the energy savings that could be made using the approach if it were to be scaled up.

    This work builds on the output of the SunCHem project, carried out by the Swiss Competence Center for Energy and Mobility (CCEM), in collaboration with EPFL, the Paul Scherrer Institut (PSI) and other partners.

    See the full article here.

    Please help promote STEM in your local schools.

    STEM Icon

    Stem Education Coalition

    EPFL campus

    EPFL is Europe’s most cosmopolitan technical university with students, professors and staff from over 120 nations. A dynamic environment, open to Switzerland and the world, EPFL is centered on its three missions: teaching, research and technology transfer. EPFL works together with an extensive network of partners including other universities and institutes of technology, developing and emerging countries, secondary schools and colleges, industry and economy, political circles and the general public, to bring about real impact for society.

     
  • richardmitnick 2:18 pm on October 10, 2014 Permalink | Reply
    Tags: , , Biofuels,   

    From BNL: “Researchers Pump Up Oil Accumulation in Plant Leaves” 

    Brookhaven Lab

    October 7, 2014
    Karen McNulty Walsh, (631) 344-8350 or Peter Genzer, (631) 344-3174

    Increasing the oil content of plant biomass could help fulfill the nation’s increasing demand for renewable energy feedstocks. But many of the details of how plant leaves make and break down oils have remained a mystery. Now a series of detailed genetic studies conducted at the U.S. Department of Energy’s (DOE) Brookhaven National Laboratory and published in The Plant Cell reveals previously unknown biochemical details about those metabolic pathways—including new ways to increase the accumulation of oil in leaves, an abundant source of biomass for fuel production.

    Using these methods, the scientists grew experimental Arabidopsis plants whose leaves accumulated 9 percent oil by dry weight, which represents an approximately 150-fold increase in oil content compared to wild type leaves.

    “This is an unusually high level of oil accumulation for plant vegetative tissue,” said Brookhaven Lab biochemist Changcheng Xu, who led the research team. “In crop plants, whose growth time is longer, if the rate of oil accumulation is the same we could get much higher oil content—possibly as high as 40 percent by weight,” he said.

    And when it comes to growing plants for biofuels, packing on the calories is the goal, because energy-dense oils give more “bang per bushel” than less-energy-dense leaf carbohydrates.
    Deciphering biochemical pathways

    The key to increasing oil accumulation in these studies was to unravel the details of the biochemical pathways involved in the conversion of carbon into fatty acids, the storage of fatty acids as oil, and the breakdown of oil in leaves. Prior to this research, scientists did not know that these processes were so intimately related.

    “Our method resulted in an unusually high level of oil accumulation in plant vegetative tissue.”
    — Brookhaven Lab biochemist Changcheng Xu

    “We previously thought that oil storage and oil degradation were alternative fates for newly synthesized fatty acids—the building blocks of oils,” said Brookhaven biochemist John Shanklin, a collaborator on the studies.

    To reveal the connections, Brookhaven’s Jillian Fan and other team members used a series of genetic tricks to systematically disable an alphabet soup of enzymes—molecules that mediate a cell’s chemical reactions—to see whether and how each had an effect in regulating the various biochemical conversions. They also used radiolabeled versions of fatty acids to trace their paths and learn how quickly they move through the pathway. They then used the findings to map out how the processes take place inside different subcellular structures, some of which you might recognize from high school science classes: the chloroplast, endoplasmic reticulum, storage droplets, and the peroxisome.

    team
    Brookhaven researchers Jilian Fan, John Shanklin, and Changcheng Xu have developed a method for getting experimental plants to accumulate more leaf oil. Their strategy could have a significant impact on the production of biofuels.

    “Our goal was to test and understand all the components of the system to fully understand how fatty acids, which are produced in the chloroplasts, are broken down in the peroxisome,” Xu said.

    Key findings

    syn
    Details of the oil synthesis and breakdown pathways within plant leaf cells: Fatty acids (FA) synthesized within chloroplasts go through a series of reactions to be incorporated into lipids (TAG) within the endoplasmic reticulum (ER); lipid droplets (LD) store lipids such as oils until they are broken down to release fatty acids into the cytoplasm; the fatty acids are eventually transported into the peroxisome for oxidation. This detailed metabolic map pointed to a new way to dramatically increase the accumulation of oil in plant leaves — blocking the SDP1 enzyme that releases fatty acids from lipid droplets in plants with elevated fatty acid synthesis. If this strategy works in biofuel crops, it could dramatically increase the energy content of biomass used to make biofuels.

    The research revealed that there is no direct pathway for fatty acids to move from the chloroplasts to the peroxisome as had previously been assumed. Instead, many complex reactions occur within the endoplasmic reticulum to first convert the fatty acids through a series of intermediates into plant oils. These oils accumulate in storage droplets within the cytoplasm until another enzyme breaks them down to release the fatty acid building blocks. Yet another enzyme must transport the fatty acids into the peroxisome for the final stages of degradation via oxidation. The amount of oil that accumulates at any one time represents a balance between the pathways of synthesis and degradation.

    Some previous attempts to increase oil accumulation in leaves have focused on disrupting the breakdown of oils by blocking the action of the enzyme that transports fatty acids into the peroxisome. The reasoning was that the accumulation of fatty acids would have a negative feedback on oil droplet breakdown. High levels of fatty acids remaining in the cytoplasm would inhibit the further breakdown of oil droplets, resulting in higher oil accumulation.

    That idea works to some extent, Xu said, but the current research shows it has negative effects on the overall health of the plants. “Plants don’t grow as well and there can be other defects,” he said.

    Based on their new understanding of the detailed biochemical steps that lead to oil breakdown, Xu and his collaborators explored another approach—namely disabling the enzyme one step back in the metabolic process, the one that breaks down oil droplets to release fatty acids.

    “If we knock out this enzyme, known as SDP1, we get a large amount of oil accumulating in the leaves,” he said, “and without substantial detrimental effects on plant growth.”

    “This research points to a new and different way to accumulate oil in leaves from that being tried in other labs,” Xu said. “In addition, the strategy differs fundamentally from other strategies that are based on adding genes, whereas our strategy is based on disabling or inactivating genes through simple mutations. This work provides a very promising platform for engineering oil production in a non-genetically modified way.”

    “This work provides another example of how research into basic biochemical mechanisms can lead to knowledge that has great promise to help solve real world problems,” concluded Shanklin.

    This research was conducted by Xu in collaboration with Jilian Fan and Chengshi Yan and John Shanklin of Brookhaven’s Biosciences Department, and Rebecca Roston, now at the University of Nebraska, Lincoln. The work was funded by the DOE Office of Science and made use of a confocal microscope at Brookhaven Lab’s Center for Functional Nanomaterials, a DOE Office of Science user facility.

    See the full article here.

    BNL Campus

    One of ten national laboratories overseen and primarily funded by the Office of Science of the U.S. Department of Energy (DOE), Brookhaven National Laboratory conducts research in the physical, biomedical, and environmental sciences, as well as in energy technologies and national security. Brookhaven Lab also builds and operates major scientific facilities available to university, industry and government researchers. The Laboratory’s almost 3,000 scientists, engineers, and support staff are joined each year by more than 5,000 visiting researchers from around the world.Brookhaven is operated and managed for DOE’s Office of Science by Brookhaven Science Associates, a limited-liability company founded by Stony Brook University, the largest academic user of Laboratory facilities, and Battelle, a nonprofit, applied science and technology organization.
    i1

    ScienceSprings relies on technology from

    MAINGEAR computers

    Lenovo
    Lenovo

    Dell
    Dell

     
  • richardmitnick 1:41 pm on August 29, 2014 Permalink | Reply
    Tags: , , Biofuels, ,   

    From LBL: “Going to Extremes for Enzymes” 

    Berkeley Logo

    Berkeley Lab

    August 29, 2014
    Lynn Yarris (510) 486-5375

    In the age-old nature versus nurture debate, Douglas Clark, a faculty scientist with Berkeley Lab and the University of California (UC) Berkeley, is not taking sides. In the search for enzymes that can break lignocellulose down into biofuel sugars under the extreme conditions of a refinery, he has prospected for extremophilic microbes and engineered his own cellulases.

    ext
    Extremophiles thriving in thermal springs where the water temperature can be close to boiling can be a rich source of enzymes for the deconstruction of lignocellulose.

    Speaking at the national meeting of the American Chemical Society (ACS) in San Francisco, Clark discussed research for the Energy Biosciences Institute (EBI) in which he and his collaborators are investigating ways to release plant sugars from lignin for the production of liquid transportation fuels. Sugars can be fermented into fuels once the woody matter comprised of cellulose, hemicellulose, and lignin is broken down, but lignocellulose is naturally recalcitrant.

    “Lignocellulose is designed by nature to stand tall and resist being broken down, and lignin in particular acts like a molecular glue to help hold it together” said Clark, who holds appointments with Berkeley Lab’s Physical Biosciences Division and UC Berkeley’s Chemical and Biomolecular Engineering Department where he currently serves as dean of the College of Chemistry. “Consequently, lignocellulosic biomass must undergo either chemical or enzymatic deconstruction to release the sugars that can be fermented to biofuels.”

    dc
    Douglas Clark holds joint appointments with Berkeley Lab and UC Berkeley and is a principal investigator with the Energy Biosciences Institute. (Photo by Roy Kaltschmidt)

    For various chemical reasons, all of which add up to cost-competitiveness, biorefineries could benefit if the production of biofuels from lignocellulosic biomass is carried out at temperatures between 65 and 70 degrees Celsius. The search by Clark and his EBI colleagues for cellulases that can tolerate these and even harsher conditions led them to thermal springs near Gerlach, Nevada, where the water temperature can be close to boiling. There they discovered a consortium of three hyperthermophilic Archaea that could grow on crystalline cellulose at 90 degrees Celsius.

    “This consortium represents the first instance of Archaea able to deconstruct lignocellulose optimally above 90°C,” Clark said.

    Following metagenomic studies on the consortium, the most active high-temperature cellulase was identified and named EBI-244.

    “The EBI-244 cellulase is active at temperatures as high as 108 degrees Celsius, the most extremely heat-tolerant enzyme ever found in any cellulose-digesting microbe,” Clark said.

    The most recent expedition of Clark and his colleagues was to thermal hot springs in Lassen Volcanic National Park, where they found an enzyme active on cellulose up to 100°C under highly acidic conditions – pH approximately 2.2.

    “The Lassen enzyme is the most acidothermophilic cellulase yet discovered,” Clark said. “The final products that it forms are similar to those produced by EBI244.”

    three
    A consortium of three hyperthermophilic Archaea that could grow on crystalline cellulose at 90 degrees Celsius yielded EBI-244, the most active high-temperature cellulase ever identified.

    In addition to bioprospecting for heat tolerant enzymes, Clark and his colleagues have developed a simple and effective mutagenesis method to enhance the properties of natural enzymes. Most recently they used this technique to increase the optimal temperature and enhance the thermostability of Ce17A, a fungal cellulase that is present in high concentrations in commercial cellulase cocktails. They engineered yeast to produce this enzyme with encouraging results.

    “The yeast Saccharomyces cerevisiae has often been used both in the engineering and basic study of Cel7A; however, Cel7A enzymes recombinantly expressed in yeast are often less active and less stable than their native counterparts,” Clark said. “We discovered that an important post-translational modification that was sometimes absent in the yeast-expressed enzyme was the underlying cause of this disparity and successfully carried out the post-translational modification in vitro. After this treatment, the properties of Cel7A recombinantly expressed in yeast were improved to match those of the native enzyme.”

    Collaborators in this research include Harvey Blanch, who also holds joint appointments with Berkeley Lab and UC Berkeley, and Frank Robb from the University of Maryland.

    EBI, which provided the funding for this research, is a collaborative partnership between BP, the funding agency, UC Berkeley, Berkeley Lab and the University of Illinois at Urbana-Champaign.

    See the full article here.

    A U.S. Department of Energy National Laboratory Operated by the University of California

    University of California Seal

    DOE Seal

    ScienceSprings relies on technology from

    MAINGEAR computers

    Lenovo
    Lenovo

    Dell
    Dell

     
c
Compose new post
j
Next post/Next comment
k
Previous post/Previous comment
r
Reply
e
Edit
o
Show/Hide comments
t
Go to top
l
Go to login
h
Show/Hide help
shift + esc
Cancel
Follow

Get every new post delivered to your Inbox.

Join 599 other followers

%d bloggers like this: