Elimination of Metabolic Pathways to All Traditional Fermentation Products Increases Ethanol Yields in Clostridium Thermocellum

Elimination of Metabolic Pathways to All Traditional Fermentation Products Increases Ethanol Yields in Clostridium Thermocellum PDF Author:
Publisher:
ISBN:
Category :
Languages : en
Pages : 6

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Book Description
Clostridium thermocellum has the natural ability to convert cellulose to ethanol, making it a promising candidate for consolidated bioprocessing (CBP) of cellulosic biomass to biofuels. To further improve its CBP capabilities, we study a mutant strain of C. thermocellum that was constructed (strain AG553; C. thermocellum [Delta]hpt [Delta]hydG [Delta]ldh [Delta]pfl [Delta]pta-ack) to increase flux to ethanol by removing side product formation. Strain AG553 showed a two- to threefold increase in ethanol yield relative to the wild type on all substrates tested. On defined medium, strain AG553 exceeded 70% of theoretical ethanol yield on lower loadings of the model crystalline cellulose Avicel, effectively eliminating formate, acetate, and lactate production and reducing H2 production by fivefold. On 5 g/L Avicel, strain AG553 reached an ethanol yield of 63.5% of the theoretical maximum compared with 19.9% by the wild type, and it showed similar yields on pretreated switchgrass and poplar. The elimination of organic acid production suggested that the strain might be capable of growth under higher substrate loadings in the absence of pH control. Final ethanol titer peaked at 73.4 mM in mutant AG553 on 20 g/L Avicel, at which point the pH decreased to a level that does not allow growth of C. thermocellum, likely due to CO2 accumulation. In comparison, the maximum titer of wild type C. thermocellum was 14.1 mM ethanol on 10 g/L Avicel. In conclusion, with the elimination of the metabolic pathways to all traditional fermentation products other than ethanol, AG553 is the best ethanol-yielding CBP strain to date and will serve as a platform strain for further metabolic engineering for the bioconversion of lignocellulosic biomass.

Elimination of Metabolic Pathways to All Traditional Fermentation Products Increases Ethanol Yields in Clostridium Thermocellum

Elimination of Metabolic Pathways to All Traditional Fermentation Products Increases Ethanol Yields in Clostridium Thermocellum PDF Author:
Publisher:
ISBN:
Category :
Languages : en
Pages : 6

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Book Description
Clostridium thermocellum has the natural ability to convert cellulose to ethanol, making it a promising candidate for consolidated bioprocessing (CBP) of cellulosic biomass to biofuels. To further improve its CBP capabilities, we study a mutant strain of C. thermocellum that was constructed (strain AG553; C. thermocellum [Delta]hpt [Delta]hydG [Delta]ldh [Delta]pfl [Delta]pta-ack) to increase flux to ethanol by removing side product formation. Strain AG553 showed a two- to threefold increase in ethanol yield relative to the wild type on all substrates tested. On defined medium, strain AG553 exceeded 70% of theoretical ethanol yield on lower loadings of the model crystalline cellulose Avicel, effectively eliminating formate, acetate, and lactate production and reducing H2 production by fivefold. On 5 g/L Avicel, strain AG553 reached an ethanol yield of 63.5% of the theoretical maximum compared with 19.9% by the wild type, and it showed similar yields on pretreated switchgrass and poplar. The elimination of organic acid production suggested that the strain might be capable of growth under higher substrate loadings in the absence of pH control. Final ethanol titer peaked at 73.4 mM in mutant AG553 on 20 g/L Avicel, at which point the pH decreased to a level that does not allow growth of C. thermocellum, likely due to CO2 accumulation. In comparison, the maximum titer of wild type C. thermocellum was 14.1 mM ethanol on 10 g/L Avicel. In conclusion, with the elimination of the metabolic pathways to all traditional fermentation products other than ethanol, AG553 is the best ethanol-yielding CBP strain to date and will serve as a platform strain for further metabolic engineering for the bioconversion of lignocellulosic biomass.

Advances in Applied Microbiology

Advances in Applied Microbiology PDF Author: Geoffrey M. Gadd
Publisher: Academic Press
ISBN: 0128207108
Category : Science
Languages : en
Pages : 202

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Book Description
Advances in Applied Microbiology, Volume 113, continues the comprehensive reach of this widely read and authoritative review source in microbiology. Users will find invaluable references and information on a variety of areas relating to the topic, with this release focusing on Gaps in the Assortment of Rapid Assays for Microorganisms of Interest to the Dairy Industry, Metal reduction and corrosion by bacterial biofilms, The microbiology of red brines, Clostridium thermocellum: a microbial platform for high-value chemical production from lignocellulose, and The zincophore system in pathogenic yeasts. - Contains contributions from leading authorities in the field - Informs and updates on all the latest developments in the field of microbiology - Includes discussions on the role of specific molecules in pathogen life stages, interactions, and much more

Bioethanol

Bioethanol PDF Author: Ayerim Y. Hernández Almanza
Publisher: CRC Press
ISBN: 1000565130
Category : Science
Languages : en
Pages : 542

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Book Description
This new book, Bioethanol: Biochemistry and Biotechnological Advances, presents some insightful perspectives and important advances in the bioethanol industry. The volume goes into detail on the biochemical and physiological parameters carried out by the main bioethanol-producing microorganisms as well as the discusses the potential applications that bioproducts can have and the advantages they generate. The chapter authors discuss a variety of issues, including the physiology of ethanol production by yeasts, by Zymomonas mobilis, and by Clostridium thermocellum. Other sources of biofuel, such as sweet sorghum, Agave americana L. leaves waste, and fungi are included as well. Chapters also discuss the genetic regulation and genetic engineering of principal microorganisms and then go on to address ways to increase ethanol tolerance in industrially important ethanol fermenting organisms, methods for developing sustainable fermentable substrates, and new strategies for ethanol purification. Chapters explore the design and engineering requirements for bioreactors, bioelectrosynthesis of ethanol via bioelectrochemical systems, and more. The book will be a valuable resource for faculty and students in this area as well as for scientists, researchers, and managers in the biofuel industry in the area of biofuel production, fermentation process, environmental engineering and all other related scientific areas.

Metabolic Engineering

Metabolic Engineering PDF Author: Sang Yup Lee
Publisher: John Wiley & Sons
ISBN: 352782345X
Category : Science
Languages : en
Pages : 1075

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Book Description
Learn more about foundational and advanced topics in metabolic engineering in this comprehensive resource edited by leaders in the field Metabolic Engineering: Concepts and Applications delivers a one-stop resource for readers seeking a complete description of the concepts, models, and applications of metabolic engineering. This guide offers practical insights into the metabolic engineering of major cell lines, including E. Coli, Bacillus and Yarrowia Lipolytica, and organisms, including human, animal, and plant). The distinguished editors also offer readers resources on microbiome engineering and the use of metabolic engineering in bioremediation. Written in two parts, Metabolic Engineering begins with the essential models and strategies of the field, like Flux Balance Analysis, Quantitative Flux Analysis, and Proteome Constrained Models. It also provides an overview of topics like Pathway Design, Metabolomics, and Genome Editing of Bacteria and Eukarya. The second part contains insightful descriptions of the practical applications of metabolic engineering, including specific examples that shed light on the topics within. In addition to subjects like the metabolic engineering of animals, humans, and plants, you’ll learn more about: Metabolic engineering concepts and a historical perspective on their development The different modes of analysis, including flux balance analysis and quantitative flux analysis An illuminating and complete discussion of the thermodynamics of metabolic pathways The Genome architecture of E. coli, as well as genome editing of both bacteria and eukarya An in-depth treatment of the application of metabolic engineering techniques to organisms including corynebacterial, bacillus, and pseudomonas, and more Perfect for students of biotechnology, bioengineers, and biotechnologists, Metabolic Engineering: Concepts and Applications also has a place on the bookshelves of research institutes, biotechnological institutes and industry labs, and university libraries. It's comprehensive treatment of all relevant metabolic engineering concepts, models, and applications will be of use to practicing biotechnologists and bioengineers who wish to solidify their understanding of the field.

Industrial Biotechnology

Industrial Biotechnology PDF Author: Christoph Wittmann
Publisher: John Wiley & Sons
ISBN: 3527807802
Category : Science
Languages : en
Pages : 862

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Book Description
The latest volume in the Advanced Biotechnology series provides an overview of the main production hosts and platform organisms used today as well as promising future cell factories in a two volume book. Alongside describing tools for genetic and metabolic engineering for strain improvement, the authors also impart topical information on computational tools, safety aspects and industrial-scale production. Following an introduction to general concepts, historical developments and future technologies, the text goes on to cover multi-purpose bacterial cell factories, including those organisms that exploit anaerobic biosynthetic power. Further chapters deal with microbes used for the production of high-value natural compounds and those obtained from alternative raw material sources, concluding with eukaryotic workhorses.

Developments and Applications of Enzymes From Thermophilic Microorganisms

Developments and Applications of Enzymes From Thermophilic Microorganisms PDF Author: Pratima Bajpai
Publisher: Elsevier
ISBN: 0443191980
Category : Science
Languages : en
Pages : 316

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Book Description
Developments and Applications of Enzymes from Thermophilic Microorganisms extensively presents the industrial application of thermophilic/hyperthermophilic enzymes. The book brings thorough and in-depth coverage on the role of these enzymes in a broad range of industries, focusing on present scenarios of these enzymes in biofuel industries, including recent advancements. The use of thermophilic enzymes in 2G biorefineries may enable the whole production process to take place at high temperatures, allowing increased reaction rate and reduced costs. Researchers in biochemistry, microbiology, microbial technology, biotechnology, molecular biology and bioresource technology will benefit from the new insights given on potential applications of hyperthermophiles. Hyperthermophilic enzymes, many of which survive at temperatures at or above 100C, contain novel macromolecules and metabolic systems which represent a vast resource for fundamental molecular and physiological studies, and for potential exploitation in biotechnology. Covers the role of thermophilic/hyperthermophilic enzymes in a broad range of industries Explains the Importance of thermophilic/hyperthermophilic enzymes in biorefineries using examples of lignocellulose and starch conversions to desired products Discusses the existing and potential applications of thermophiles/hyperthermophilic enzymes

Fungal Applications in Sustainable Environmental Biotechnology

Fungal Applications in Sustainable Environmental Biotechnology PDF Author: Diane Purchase
Publisher: Springer
ISBN: 3319428527
Category : Science
Languages : en
Pages : 407

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Book Description
Fungi are distinct eukaryotic organisms renowned for their remarkable biodiversity and extensive habitat range. Many fungal species have long been exploited for food and medicines. This volume considers other important applications of fungal biotechnology especially in an environmental context, showcasing the essential contributions of these amazingly versatile organisms. It explores how fungi offer sustainable solutions to tackle various environmental concerns. Written by eminent experts in their fields, this work presents a broad array of current advances and future prospects in fungal environmental biotechnology and discusses their limitations and potential. The book is organized in five parts, each addressing a theme of the UN Sustainable Development Goals (SDG): strengthen food security (Zero Hunger), wastewater treatment (Clean Water & Sanitation), pollution reduction (Life on Land), biofuel production (Affordable & Clean Energy) and biosynthesis of novel biomolecules (Responsible Consumption & Production).

Industrial Biotechnology

Industrial Biotechnology PDF Author: Christoph Wittmann
Publisher: John Wiley & Sons
ISBN: 352734179X
Category : Science
Languages : en
Pages : 789

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Book Description
The latest volume in the Advanced Biotechnology series provides an overview of the main production hosts and platform organisms used today as well as promising future cell factories in a two volume book. Alongside describing tools for genetic and metabolic engineering for strain improvement, the authors also impart topical information on computational tools, safety aspects and industrial-scale production. Following an introduction to general concepts, historical developments and future technologies, the text goes on to cover multi-purpose bacterial cell factories, including those organisms that exploit anaerobic biosynthetic power. Further chapters deal with microbes used for the production of high-value natural compounds and those obtained from alternative raw material sources, concluding with eukaryotic workhorses.

Waste to Wealth

Waste to Wealth PDF Author: Reeta Rani Singhania
Publisher: Springer
ISBN: 9811074313
Category : Science
Languages : en
Pages : 525

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Book Description
This book focuses on value addition to various waste streams, which include industrial waste, agricultural waste, and municipal solid and liquid waste. It addresses the utilization of waste to generate valuable products such as electricity, fuel, fertilizers, and chemicals, while placing special emphasis on environmental concerns and presenting a multidisciplinary approach for handling waste. Including chapters authored by prominent national and international experts, the book will be of interest to researchers, professionals and policymakers alike.

Handbook on Clostridia

Handbook on Clostridia PDF Author: Peter Duerre
Publisher: CRC Press
ISBN: 113550198X
Category : Medical
Languages : en
Pages : 1451

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Book Description
Clostridia is one of the largest bacterial genera with an enormous potential for biotechnical and medical applications. Despite growing scientific, medical, and industrial interest, information on basic methods, biochemical fundamentals, clinical practice, industrial applications, and novel developments remains scattered in a variety of research ar