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Biotechnology for Biofuels

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https://www.readbyqxmd.com/read/28077967/integrated-omics-analyses-reveal-the-details-of-metabolic-adaptation-of-clostridium-thermocellum-to-lignocellulose-derived-growth-inhibitors-released-during-the-deconstruction-of-switchgrass
#1
Suresh Poudel, Richard J Giannone, Miguel Rodriguez, Babu Raman, Madhavi Z Martin, Nancy L Engle, Jonathan R Mielenz, Intawat Nookaew, Steven D Brown, Timothy J Tschaplinski, David Ussery, Robert L Hettich
BACKGROUND: Clostridium thermocellum is capable of solubilizing and converting lignocellulosic biomass into ethanol. Although much of the work-to-date has centered on characterizing this microbe's growth on model cellulosic substrates, such as cellobiose, Avicel, or filter paper, it is vitally important to understand its metabolism on more complex, lignocellulosic substrates to identify relevant industrial bottlenecks that could undermine efficient biofuel production. To this end, we have examined a time course progression of C...
2017: Biotechnology for Biofuels
https://www.readbyqxmd.com/read/28070222/scale-up-and-process-integration-of-sugar-production-by-acidolysis-of-municipal-solid-waste-corn-stover-blends-in-ionic-liquids
#2
Chenlin Li, Ling Liang, Ning Sun, Vicki S Thompson, Feng Xu, Akash Narani, Qian He, Deepti Tanjore, Todd R Pray, Blake A Simmons, Seema Singh
BACKGROUND: Lignocellulosic biorefineries have tonnage and throughput requirements that must be met year round and there is no single feedstock available in any given region that is capable of meeting the price and availability demands of the biorefineries scheduled for deployment. Significant attention has been historically given to agriculturally derived feedstocks; however, a diverse range of wastes, including municipal solid wastes (MSW), also have the potential to serve as feedstocks for the production of advanced biofuels and have not been extensively studied...
2017: Biotechnology for Biofuels
https://www.readbyqxmd.com/read/28070221/nannochloropsis-a-rich-source-of-diacylglycerol-acyltransferases-for-engineering-of-triacylglycerol-content-in-different-hosts
#3
Krzysztof Zienkiewicz, Agnieszka Zienkiewicz, Eric Poliner, Zhi-Yan Du, Katharina Vollheyde, Cornelia Herrfurth, Sofia Marmon, Eva M Farré, Ivo Feussner, Christoph Benning
BACKGROUND: Photosynthetic microalgae are considered a viable and sustainable resource for biofuel feedstocks, because they can produce higher biomass per land area than plants and can be grown on non-arable land. Among many microalgae considered for biofuel production, Nannochloropsis oceanica (CCMP1779) is particularly promising, because following nutrient deprivation it produces very high amounts of triacylglycerols (TAG). The committed step in TAG synthesis is catalyzed by acyl-CoA:diacylglycerol acyltransferase (DGAT)...
2017: Biotechnology for Biofuels
https://www.readbyqxmd.com/read/28066511/biomass-waste-to-energy-valorisation-technologies-a-review-case-for-banana-processing-in-uganda
#4
REVIEW
Robert Gumisiriza, Joseph Funa Hawumba, Mackay Okure, Oliver Hensel
BACKGROUND: Uganda's banana industry is heavily impeded by the lack of cheap, reliable and sustainable energy mainly needed for processing of banana fruit into pulp and subsequent drying into chips before milling into banana flour that has several uses in the bakery industry, among others. Uganda has one of the lowest electricity access levels, estimated at only 2-3% in rural areas where most of the banana growing is located. In addition, most banana farmers have limited financial capacity to access modern solar energy technologies that can generate sufficient energy for industrial processing...
2017: Biotechnology for Biofuels
https://www.readbyqxmd.com/read/28066510/rapid-in-vivo-lipid-carbohydrate-quantification-of-single-microalgal-cell-by-raman-spectral-imaging-to-reveal-salinity-induced-starch-to-lipid-shift
#5
Liang-da Chiu, Shih-Hsin Ho, Rintaro Shimada, Nan-Qi Ren, Takeaki Ozawa
BACKGROUND: Lipid/carbohydrate content and ratio are extremely important when engineering algal cells for liquid biofuel production. However, conventional methods for such determination and quantification are not only destructive and tedious, but also energy consuming and environment unfriendly. In this study, we first demonstrate that Raman spectroscopy is a clean, fast, and accurate method to simultaneously quantify the lipid/carbohydrate content and ratio in living microalgal cells...
2017: Biotechnology for Biofuels
https://www.readbyqxmd.com/read/28066509/development-and-implementation-of-rapid-metabolic-engineering-tools-for-chemical-and-fuel-production-in-geobacillus-thermoglucosidasius-ncimb-11955
#6
Lili Sheng, Katalin Kovács, Klaus Winzer, Ying Zhang, Nigel Peter Minton
BACKGROUND: The thermophile Geobacillus thermoglucosidasius has considerable attraction as a chassis for the production of chemicals and fuels. It utilises a wide range of sugars and oligosaccharides typical of those derived from lignocellulose and grows at elevated temperatures. The latter improves the rate of feed conversion, reduces fermentation cooling costs and minimises the risks of contamination. Full exploitation of its potential has been hindered by a dearth of effective gene tools...
2017: Biotechnology for Biofuels
https://www.readbyqxmd.com/read/28066508/a-molecular-genetic-toolbox-for-yarrowia-lipolytica
#7
Erin L Bredeweg, Kyle R Pomraning, Ziyu Dai, Jens Nielsen, Eduard J Kerkhoven, Scott E Baker
BACKGROUND: Yarrowia lipolytica is an ascomycete yeast used in biotechnological research for its abilities to secrete high concentrations of proteins and accumulate lipids. Genetic tools have been made in a variety of backgrounds with varying similarity to a comprehensively sequenced strain. RESULTS: We have developed a set of genetic and molecular tools in order to expand capabilities of Y. lipolytica for both biological research and industrial bioengineering applications...
2017: Biotechnology for Biofuels
https://www.readbyqxmd.com/read/28053668/study-of-traits-and-recalcitrance-reduction-of-field-grown-comt-down-regulated-switchgrass
#8
Mi Li, Yunqiao Pu, Chang Geun Yoo, Erica Gjersing, Stephen R Decker, Crissa Doeppke, Todd Shollenberger, Timothy J Tschaplinski, Nancy L Engle, Robert W Sykes, Mark F Davis, Holly L Baxter, Mitra Mazarei, Chunxiang Fu, Richard A Dixon, Zeng-Yu Wang, C Neal Stewart, Arthur J Ragauskas
BACKGROUND: The native recalcitrance of plants hinders the biomass conversion process using current biorefinery techniques. Down-regulation of the caffeic acid O-methyltransferase (COMT) gene in the lignin biosynthesis pathway of switchgrass reduced the thermochemical and biochemical conversion recalcitrance of biomass. Due to potential environmental influences on lignin biosynthesis and deposition, studying the consequences of physicochemical changes in field-grown plants without pretreatment is essential to evaluate the performance of lignin-altered plants...
2017: Biotechnology for Biofuels
https://www.readbyqxmd.com/read/28053667/the-sole-introduction-of-two-single-point-mutations-establishes-glycerol-utilization-in-saccharomyces-cerevisiae-cen-pk-derivatives
#9
Ping-Wei Ho, Steve Swinnen, Jorge Duitama, Elke Nevoigt
BACKGROUND: Glycerol is an abundant by-product of biodiesel production and has several advantages as a substrate in biotechnological applications. Unfortunately, the popular production host Saccharomyces cerevisiae can barely metabolize glycerol by nature. RESULTS: In this study, two evolved derivatives of the strain CEN.PK113-1A were created that were able to grow in synthetic glycerol medium (strains PW-1 and PW-2). Their growth performances on glycerol were compared with that of the previously published evolved CEN...
2017: Biotechnology for Biofuels
https://www.readbyqxmd.com/read/28053666/when-substrate-inhibits-and-inhibitor-activates-implications-of-%C3%AE-glucosidases
#10
Silja Kuusk, Priit Väljamäe
BACKGROUND: β-glucosidases (BGs) catalyze the hydrolysis of β-glycosidic bonds in glucose derivatives. They constitute an important group of enzymes with biotechnological interest like supporting cellulases in degradation of lignocellulose to fermentable sugars. In the latter context, the glucose tolerant BGs are of particular interest. These BGs often show peculiar kinetics, including inhibitory effects of substrates and activating effects of inhibitors, such as glucose or xylose. The mechanisms behind the activating/inhibiting effects are poorly understood...
2017: Biotechnology for Biofuels
https://www.readbyqxmd.com/read/28053665/improved-growth-rate-in-clostridium-thermocellum-hydrogenase-mutant-via-perturbed-sulfur-metabolism
#11
Ranjita Biswas, Charlotte M Wilson, Richard J Giannone, Dawn M Klingeman, Thomas Rydzak, Manesh B Shah, Robert L Hettich, Steven D Brown, Adam M Guss
BACKGROUND: Metabolic engineering is a commonly used approach to develop organisms for an industrial function, but engineering aimed at improving one phenotype can negatively impact other phenotypes. This lack of robustness can prove problematic. Cellulolytic bacterium Clostridium thermocellum is able to rapidly ferment cellulose to ethanol and other products. Recently, genes involved in H2 production, including the hydrogenase maturase hydG and NiFe hydrogenase ech, were deleted from the chromosome of C...
2017: Biotechnology for Biofuels
https://www.readbyqxmd.com/read/28053664/the-coptotermes-gestroi-aldo-keto-reductase-a-multipurpose-enzyme-for-biorefinery-applications
#12
Robson Tramontina, João Paulo L Franco Cairo, Marcelo V Liberato, Fernanda Mandelli, Amanda Sousa, Samantha Santos, Sarita Cândida Rabelo, Bruna Campos, Jaciane Ienczak, Roberto Ruller, André R L Damásio, Fabio Marcio Squina
BACKGROUND: In nature, termites can be considered as a model biological system for biofuel research based on their remarkable efficiency for lignocellulosic biomass conversion. Redox enzymes are of interest in second-generation ethanol production because they promote synergic enzymatic activity with classical hydrolases for lignocellulose saccharification and inactivate fermentation inhibitory compounds produced after lignocellulose pretreatment steps. RESULTS: In the present study, the biochemical and structural characteristics of the Coptotermes gestroi aldo-keto reductase (CgAKR-1) were comprehensively investigated...
2017: Biotechnology for Biofuels
https://www.readbyqxmd.com/read/28053663/utilization-of-xylose-by-engineered-strains-of-ashbya-gossypii-for-the-production-of-microbial-oils
#13
David Díaz-Fernández, Patricia Lozano-Martínez, Rubén M Buey, José Luis Revuelta, Alberto Jiménez
BACKGROUND: Ashbya gossypii is a filamentous fungus that is currently exploited for the industrial production of riboflavin. The utilization of A. gossypii as a microbial biocatalyst is further supported by its ability to grow in low-cost feedstocks, inexpensive downstream processing and the availability of an ease to use molecular toolbox for genetic and genomic modifications. Consequently, A. gossypii has been also introduced as an ideal biotechnological chassis for the production of inosine, folic acid, and microbial oils...
2017: Biotechnology for Biofuels
https://www.readbyqxmd.com/read/28053662/development-of-a-genome-editing-crispr-cas9-system-in-thermophilic-fungal-myceliophthora-species-and-its-application-to-hyper-cellulase-production-strain-engineering
#14
Qian Liu, Ranran Gao, Jingen Li, Liangcai Lin, Junqi Zhao, Wenliang Sun, Chaoguang Tian
BACKGROUND: Over the past 3 years, the CRISPR/Cas9 system has revolutionized the field of genome engineering. However, its application has not yet been validated in thermophilic fungi. Myceliophthora thermophila, an important thermophilic biomass-degrading fungus, has attracted industrial interest for the production of efficient thermostable enzymes. Genetic manipulation of Myceliophthora is crucial for metabolic engineering and to unravel the mechanism of lignocellulose deconstruction...
2017: Biotechnology for Biofuels
https://www.readbyqxmd.com/read/28031745/rnai-downregulation-of-three-key-lignin-genes-in-sugarcane-improves-glucose-release-without-reduction-in-sugar-production
#15
William P Bewg, Charleson Poovaiah, Wu Lan, John Ralph, Heather D Coleman
BACKGROUND: Sugarcane is a subtropical crop that produces large amounts of biomass annually. It is a key agricultural crop in many countries for the production of sugar and other products. Residual bagasse following sucrose extraction is currently underutilized and it has potential as a carbohydrate source for the production of biofuels. As with all lignocellulosic crops, lignin acts as a barrier to accessing the polysaccharides, and as such, is the focus of transgenic efforts. In this study, we used RNAi to individually reduce the expression of three key genes in the lignin biosynthetic pathway in sugarcane...
2016: Biotechnology for Biofuels
https://www.readbyqxmd.com/read/28031744/self-regulated-1-butanol-production-in-escherichia-coli-based-on-the-endogenous-fermentative-control
#16
Rex C Wen, Claire R Shen
BACKGROUND: As a natural fermentation product secreted by Clostridium species, bio-based 1-butanol has attracted great attention for its potential as alternative fuel and chemical feedstock. Feasibility of microbial 1-butanol production has also been demonstrated in various recombinant hosts. RESULTS: In this work, we constructed a self-regulated 1-butanol production system in Escherichia coli by borrowing its endogenous fermentation regulatory elements (FRE) to automatically drive the 1-butanol biosynthetic genes in response to its natural fermentation need...
2016: Biotechnology for Biofuels
https://www.readbyqxmd.com/read/28018486/hydrogen-production-by-the-hyperthermophilic-bacterium-thermotoga-maritima-part-i-effects-of-sulfured-nutriments-with-thiosulfate-as-model-on-hydrogen-production-and-growth
#17
Céline Boileau, Richard Auria, Sylvain Davidson, Laurence Casalot, Pierre Christen, Pierre-Pol Liebgott, Yannick Combet-Blanc
BACKGROUND: Thermotoga maritima and T. neapolitana are hyperthermophile bacteria chosen by many research teams to produce bio-hydrogen because of their potential to ferment a wide variety of sugars with the highest theoretical H2/glucose yields. However, to develop economically sustainable bio-processes, the culture medium formulation remained to be optimized. The main aim of this study was to quantify accurately and specifically the effect of thiosulfate, used as sulfured nutriment model, on T...
2016: Biotechnology for Biofuels
https://www.readbyqxmd.com/read/28018485/hydrogen-production-by-the-hyperthermophilic-bacterium-thermotoga-maritima-part-ii-modeling-and-experimental-approaches-for-hydrogen-production
#18
Richard Auria, Céline Boileau, Sylvain Davidson, Laurence Casalot, Pierre Christen, Pierre Pol Liebgott, Yannick Combet-Blanc
BACKGROUND: Thermotoga maritima is a hyperthermophilic bacterium known to produce hydrogen from a large variety of substrates. The aim of the present study is to propose a mathematical model incorporating kinetics of growth, consumption of substrates, product formations, and inhibition by hydrogen in order to predict hydrogen production depending on defined culture conditions. RESULTS: Our mathematical model, incorporating data concerning growth, substrates, and products, was developed to predict hydrogen production from batch fermentations of the hyperthermophilic bacterium, T...
2016: Biotechnology for Biofuels
https://www.readbyqxmd.com/read/28018484/mechanistic-insights-into-the-effect-of-imidazolium-ionic-liquid-on-lipid-production-by-geotrichum-fermentans
#19
Li-Ping Liu, Min-Hua Zong, Robert J Linhardt, Wen-Yong Lou, Ning Li, Chao Huang, Hong Wu
BACKGROUND: Ionic liquid (IL) pretreatment has emerged as a promising technique that enables complete utilization of lignocellulosic biomass for biofuel production. However, imidazolium IL has recently been shown to exhibit inhibitory effect on cell growth and product formation of industrial microbes, such as oleaginous microorganisms. To date, the mechanism of this inhibition remains largely unknown. RESULTS: In this study, the feasibility of [Bmim][OAc]-pretreated rice straw hydrolysate as a substrate for microbial lipid production by Geotrichum fermentans, also known as Trichosporon fermentans, was evaluated...
2016: Biotechnology for Biofuels
https://www.readbyqxmd.com/read/27990176/enhanced-production-of-2-3-butanediol-by-engineered-saccharomyces-cerevisiae-through-fine-tuning-of-pyruvate-decarboxylase-and-nadh-oxidase-activities
#20
Jin-Woo Kim, Jungyeon Kim, Seung-Oh Seo, Kyoung Heon Kim, Yong-Su Jin, Jin-Ho Seo
BACKGROUND: 2,3-Butanediol (2,3-BD) is a promising compound for various applications in chemical, cosmetic, and agricultural industries. Pyruvate decarboxylase (Pdc)-deficient Saccharomyces cerevisiae is an attractive host strain for producing 2,3-BD because a large amount of pyruvate could be shunted to 2,3-BD production instead of ethanol synthesis. However, 2,3-BD yield, productivity, and titer by engineered yeast were inferior to native bacterial producers because of the following metabolic limitations...
2016: Biotechnology for Biofuels
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