Download or read book Designing Novel Enzymes for Homogeneous Catalysis in Organic Solvents written by C. Wong and published by . This book was released on 1999 with total page 6 pages. Available in PDF, EPUB and Kindle. Book excerpt: Several mutants derived from the thermostable subtilisin 8397 were produced in order to create an enzyme that is more stable toward organic solvents, or more effective for peptide coupling in aqueous solution. Mutants were created with higher stability (8397/K256Y), broader substrate specificity (83 97/M222A/Y217W), and better aminolysis:hydrolysis ratio (8397/C206Q/S221C). Engineered subtilisins were shown to be useful in the coupling of glycopeptides, and in tandem with the use of glycosyltransferases, subtilisin was shown to be useful for synthesizing homogeneous glycoproteins. X-ray crystallographic and NMR structural studies of the subtilisin active site in 50% DMF support a nearly 180 deg flip in the ring of the active site histidine, which may help explain the large changes in catalysis under these conditions.

Download or read book Molecular Design and Bioorganic Catalysis written by C.S. Wilcox and published by Springer. This book was released on 2012-02-26 with total page 268 pages. Available in PDF, EPUB and Kindle. Book excerpt: One of the most active areas of contemporary organic chemistry involves the search for new catalysts that borrow concepts, strategies and even components from enzymes but yet are not found in nature. Such artificial enzymes not only give enormous insights into the mechanisms of enzyme catalysis but also offer the potential for catalyzing a wide range of chemical reactions with no counterpart in nature. Several approaches have been taken in the deVelopment of new catalysts, some based on biological methods and others on synthetic techniques. Site directed mutagenesis has allowed the direct replacement of amino acids in an enzyme with resulting changes in stability, selectivity and mechanism. Recent developments have shown that even non-natural amino acids can be incorporated into proteins and also that enzymes can function effectively in organic solvents. A different biological route to artificial enzymes has exploited the immune system and its ability to generate millions of antibodies to a given antigen. Novel antigens have been designed to mimic the transition states of chemical reactions. Antibodies elicited against these antigens thus contain an active site that is complementary to transition state structure and can potentially catalyze target reactions. A broad range of reactions can now be 6 catalyzed using the method with rate accelerations reaching 10 compared to the control reactions. Protein engineering and catalytic antibodies represent complex solutions to the problem of artificial enzymes. Their complexity is however their principal limitation.

Download or read book The Design of Enzymatic Systems for Catalysis in Organic Solvents written by Valerie Mei-lin Reiko Suzawa and published by . This book was released on 1995 with total page 286 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Enzymes as Catalysts in Organic Synthesis written by Manfred P. Schneider and published by Springer Science & Business Media. This book was released on 2012-12-06 with total page 422 pages. Available in PDF, EPUB and Kindle. Book excerpt: Proceedings of the NATO Advanced Research Workshop, Reisensburg/Ulm, Donau, Germany, June 16-22, 1985

Download or read book Enzymes in Nonaqueous Solvents written by Evgeny N. Vulfson and published by Springer Science & Business Media. This book was released on 2008-02-05 with total page 677 pages. Available in PDF, EPUB and Kindle. Book excerpt: Enzymatic catalysis has gained considerable attention in recent years as an efficient tool in the preparation of natural products, pharmaceuticals, fine chemicals, and food ingredients. The high selectivity and mild reaction con- tions associated with enzymatic transformations have made this approach an attractive alternative in the synthesis of complex bioactive compounds, which are often difficult to obtain by standard chemical routes. However, the maj- ity of organic compounds are not very soluble in water, which was traditi- ally perceived as the only suitable reaction medium for the application of biocatalysts. The realization that most enzymes can function perfectly well under nearly anhydrous conditions and, in addition, display a number of useful properties, e. g. , highly enhanced stability and different selectivity, has d- matically widened the scope of their application to the organic synthesis. Another great attraction of using organic solvents rather than water as a reaction solvent is the ability to perform synthetic transformations with re- tively inexpensive hydrolytic enzymes. It is worth reminding the reader that in vivo, the synthetic and hydrolytic pathways are catalyzed by different enzymes. However, elimination of water from the reaction mixture enables the “reversal” of hydrolytic enzymes and thus avoids the use of the expensive cofactors or activated substrates that are required for their synthetic count- parts.

Download or read book Enzyme Biocatalysis written by Andrés Illanes and published by Springer Science & Business Media. This book was released on 2008-06-19 with total page 398 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book was written with the purpose of providing a sound basis for the design of enzymatic reactions based on kinetic principles, but also to give an updated vision of the potentials and limitations of biocatalysis, especially with respect to recent app- cations in processes of organic synthesis. The ?rst ?ve chapters are structured in the form of a textbook, going from the basic principles of enzyme structure and fu- tion to reactor design for homogeneous systems with soluble enzymes and hete- geneous systems with immobilized enzymes. The last chapter of the book is divided into six sections that represent illustrative case studies of biocatalytic processes of industrial relevance or potential, written by experts in the respective ?elds. We sincerely hope that this book will represent an element in the toolbox of gr- uate students in applied biology and chemical and biochemical engineering and also of undergraduate students with formal training in organic chemistry, biochemistry, thermodynamics and chemical reaction kinetics. Beyond that, the book pretends also to illustrate the potential of biocatalytic processes with case studies in the ?eld of organic synthesis, which we hope will be of interest for the academia and prof- sionals involved in R&D&I. If some of our young readers are encouraged to engage or persevere in their work in biocatalysis this will certainly be our more precious reward.

Download or read book Novel Enzyme and Whole Cell Biocatalysts written by Anwar Sunna and published by MDPI. This book was released on 2020-11-04 with total page 332 pages. Available in PDF, EPUB and Kindle. Book excerpt: The concept of a circular economy relies on waste reduction, valorization, and recycling. Global trends for “green” synthesis of chemicals have positioned the field of enzyme technology and biocatalysis (multi-enzymes and whole-cells) as an alternative for the synthesis of more social- and environmentally-responsible bio-based chemicals. Recent advances in synthetic biology, computational tools, and metabolic engineering have supported the discovery of new enzymes and the rational design of whole-cell biocatalysts. In this book, we highlight these current advances in the field of biocatalysis, with special emphasis on novel enzymes and whole-cell biocatalysts for applications in several industrial biotechnological applications.

Download or read book Supramolecular Catalysis written by Piet W.N.M. van Leeuwen and published by John Wiley & Sons. This book was released on 2022-05-31 with total page 708 pages. Available in PDF, EPUB and Kindle. Book excerpt: Supramolecular Catalysis Provides a timely and detailed overview of the expanding field of supramolecular catalysis The subdiscpline of supramolecular catalysis has expanded in recent years, benefiting from the development of homogeneous catalysis and supramolecular chemistry. Supramolecular catalysis allows chemists to design custom-tailored metal and organic catalysts by devising non-covalent interactions between the various components of the reaction. Edited by two world-renowned researchers, Supramolecular Catalysis: New Directions and Developments summarizes the most significant developments in the dynamic, interdisciplinary field. Contributions from an international panel of more than forty experts address a broad range of topics covering both organic and metal catalysts, including emergent catalysis by self-replicating molecules, switchable catalysis using allosteric effects, supramolecular helical catalysts, and transition metal catalysis in confined spaces. This authoritative and up-to-date volume: Covers ligand-ligand interactions, assembled multi-component catalysts, ligand-substrate interactions, and supramolecular organocatalysis and non-classical interactions Presents recent work on supramolecular catalysis in water, supramolecular allosteric catalysis, and catalysis promoted by discrete cages, capsules, and other confined environments Highlights current research trends and discusses the future of supramolecular catalysis Includes full references and numerous figures, tables, and color illustrations Supramolecular Catalysis: New Directions and Developments is essential reading for catalytic chemists, complex chemists, biochemists, polymer chemists, spectroscopists, and chemists working with organometallics.

Download or read book Sustainable Catalysis written by Rafael Luque and published by John Wiley & Sons. This book was released on 2018-05-07 with total page 292 pages. Available in PDF, EPUB and Kindle. Book excerpt: Highlighting sustainable catalytic processes in synthetic organic chemistry and industry, this useful guide places special emphasis on catalytic reactions carried out at room temperature. It describes the fundamentals, summarizes key advances, and covers applications in industrial processes in the field of energy generation from renewables, food science, and pollution control. Throughout, the latest research from various disciplines is combined, such as homogeneous and heterogeneous catalysis, biocatalysis, and photocatalysis. The book concludes with a chapter on future trends and energy challenges for the latter half of the 21st century. With its multidisciplinary approach this is an essential reference for academic and industrial researchers in catalysis science aiming to design more sustainable and energy-efficient processes.

Download or read book Enzyme Engineering written by Manfred T. Reetz and published by John Wiley & Sons. This book was released on 2023-01-09 with total page 405 pages. Available in PDF, EPUB and Kindle. Book excerpt: Enzyme Engineering An authoritative and up-to-date discussion of enzyme engineering and its applications In Enzyme Engineering: Selective Catalysts for Applications in Biotechnology, Organic Chemistry, and Life Science, a team of distinguished researchers deliver a robust treatment of enzyme engineering and its applications in various fields such as biotechnology, life science, and synthesis. The book begins with an introduction to different protein engineering techniques, covers topics like gene mutagenesis methods for directed evolution and rational enzyme design. It includes industrial case studies of enzyme engineering with a focus on selectivity and activity. The authors also discuss new and innovative areas in the field, involving machine learning and artificial intelligence. It offers several insightful perspectives on the future of this work. Readers will also find: A thorough introduction to directed evolution and rational design as protein engineering techniques Comprehensive explorations of screening and selection techniques, gene mutagenesis methods in directed evolution, and guidelines for applying gene mutagenesis in organic chemistry, pharmaceutical applications, and biotechnology Practical discussions of protein engineering of enzyme robustness relevant to organic and pharmaceutical chemistry Treatments of artificial enzymes as promiscuous catalysts Various lessons learned from semi-rational and rational directed evolution A transdisciplinary treatise, Enzyme Engineering: Selective Catalysts for Applications in Biotechnology, Organic Chemistry, and Life Science is perfect for protein engineers, theoreticians, organic, and pharmaceutical chemists as well as transition metal researchers in catalysis and biotechnologists.

Download or read book Design And Applications Of Single site Heterogeneous Catalysts Contributions To Green Chemistry Clean Technology And Sustainability written by John Meurig Thomas and published by World Scientific Publishing Company. This book was released on 2012-04-16 with total page 324 pages. Available in PDF, EPUB and Kindle. Book excerpt: For far too long chemists and industrialists have relied on the use of aggressive reagents such as nitric and sulphuric acids, permanganates and dichromates to prepare the massive quantities of both bulk and fine chemicals that are needed for the maintenance of civilised life — materials such as fuels, fabrics, foodstuffs, fertilisers and pharmaceuticals. Such aggressive reagents generate vast quantities of environmentally harmful and often toxic by-products, including the oxides of nitrogen, of metal oxides and carbon dioxide.Now, owing to recent advances made in the synthesis of nanoporous solids, it is feasible to design new solid catalysts that enable benign, mild oxidants to be used, frequently without utilising solvents, to manufacture the products that the chemical, pharmaceutical, agro- and bio-chemical industries require. These new solid agents are designated single-site heterogeneous catalysts (SSHCs). Their principal characteristics are that all the active sites present in the high-area solids are identical in their atomic environment and hence in their energy of interaction with reactants, just as in enzymes.Single-site heterogeneous catalysts now occupy a position of growing importance both academically and in their potential for commercial exploitation. This text, the only one devoted to such catalysts, dwells both on principles of design and on applications, such as the benign synthesis of nylon 6 and vitamin B3. It equips the reader with unifying insights required for future catalytic adventures in the quest for sustainability in the materials used by humankind.Anyone acquainted with the language of molecules, including undergraduates in the physical and biological sciences, as well as graduates in engineering and materials science, should be able to assimilate the principles and examples presented in this book. Inter alia, it describes how clean technology and ‘green’ processes may be carried out in an environmentally responsible manner.

Download or read book Enzymatic Reactions in Organic Media written by Ari Koskinen and published by Springer Science & Business Media. This book was released on 1995-12-31 with total page 338 pages. Available in PDF, EPUB and Kindle. Book excerpt: The outlook of organic synthesis has changed many times during its tractable history. The initial focus on the synthesis of substances typical of living matter, exemplified by the first examples of organic chemistry through the synthesis of urea from inorganic substances by Liebig, was accepted as the birth of organic chemistry, and thus also of organic synthesis. Although the early developments in organic synthesis closely followed the pursuit of molecules typical in nature, towards the end of the 19th century, societal pressures placed higher demands on chemical methods appropriate for the emerging age of industrialization. This led to vast amounts of information being generated through the discovery of synthetic reactions, spectroscopic techniques and reaction mechanisms. The basic organic functional group transformations were discovered and improved during the early part of this century. Reaction mechanisms were elucidated at a growing pace, and extremely powerful spectroscopic tools, such as infrared, nuclear magnetic resonance and mass spectrometry were introduced as everyday tools for a practising organic chemist. By the 1950s, many practitioners were ready to agree that almost every molecule could be syn thesized. Some difficult stereochemical problems were exceptions; for example Woodward concluded that erythromycin was a "hopelessly complex target". This frustration led to a hectic phase of development of new and increasingly more ingenious protecting group strategies and functional group transformations, and also saw the emergence of asymmetric synthesis.

Download or read book New Enzymes for Organic Synthesis written by Thomas Scheper and published by Springer Science & Business Media. This book was released on 2007-02-08 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: Isolated enzymes are known as useful for synthesising of complex molecules with more and more large scale applications in recent years. These six reviews show different steps in the development of enzymatic syntheses for useful compounds. Screening of novel enzymes, their biochemical characterisation as well as reaction engineering approaches in order to increase their performance are treated in three papers. Then the use of protein design as a tool for the directed improvement of reactivity and selectivity of biocatalysts is described in two reviews. The supply of sufficient quantities of biocatalysts must not be neglected: fluidized bed adsorption as an emerging technology for the simple and fast purification of biomolecules is presented in the light of its potential in large scale supply of enzyme catalysts.

Download or read book Enzyme Design for Nonaqueous Media Optimization of Enzymatic Catalysis for Organic Solvent Systems written by and published by . This book was released on 1994 with total page 5 pages. Available in PDF, EPUB and Kindle. Book excerpt: From a biotechnological perspective there are many potential advantages of employing enzymes in organic as opposed to aqueous media. To that end, we have concluded an initial three-year research program in the area of enzymatic catalysis in organic solvents. Our studies have focused on the effect of protein hydration on subtilisins BPN' and Carlsberg in nonaqueous media. Investigations on protein engineered mutants, catalyst engineering studies, and structural studies, primarily employing EPR spectroscopy, have revealed fundamental information on the role of water, the the nature of enzyme structure, and the effects of solvents on the catalytic activity in organic solvents. This study has also resulted in several rational methods to dramatically improve enzyme activity under anhydrous conditions. Catalytic activities in organic solvents can now be expressed at levels similar to that in water--this is a major advance in the field of nonaqueous enzymology. (jg).

Download or read book New Enzymes for Organic Synthesis written by Thomas Scheper and published by Springer. This book was released on 2014-01-15 with total page 248 pages. Available in PDF, EPUB and Kindle. Book excerpt: Isolated enzymes are known as useful for synthesising of complex molec ules with more and more large scale applications in recent years. Thes e six reviews show different steps in the development of enzymatic syn theses for useful compounds. Screening of novel enzymes, their biochem ical characterisation as well as reaction engineering approaches in or der to increase their performance are treated in three papers. Then th e use of protein design as a tool for the directed improvement of reac tivity and selectivity of biocatalysts is described in two reviews. Th e supply of sufficient quantities of biocatalysts must not be neglecte d: fluidized bed adsorption as an emerging technology for the simple a nd fast purification of biomolecules is presented in the light of its potential in large scale supply of enzyme catalysts.

Download or read book New Trends in Enzyme Catalysis and Biomimetic Chemical Reactions written by Gertz I. Likhtenshtein and published by Springer Science & Business Media. This book was released on 2007-05-08 with total page 239 pages. Available in PDF, EPUB and Kindle. Book excerpt: "This book is a view of enzyme catalysis by a physico-chemist with long-term experience in the investigation of structure and action mechanism of biological catalysts. This book is not intended to provide an exhaustive survey of each topic but rather a discussion of their theoretical and experimental background, and recent developments. The literature of enzyme catalysis is so vast and many scientists have made important contribution in the area, that it is impossible in the space allowed for this book to give a representative set of references. The author has tried to use reviews, and general principles of articles. He apologizes to those he has not been able to include. . ... The monograph is intended for scientists working on enzyme catalysis and adjacent areas such as chemical modeling of biological processes, homogeneous catalysis, biomedical research and biotechnology. The book can be use as a subsidiary manual for instructors, graduate and undergraduate students of university biochemistry and chemistry departments."--Pages ix-x.

Download or read book Enzyme Catalysis in Organic Synthesis written by Karlheinz Drauz and published by Wiley-VCH. This book was released on 2002-07-26 with total page 380 pages. Available in PDF, EPUB and Kindle. Book excerpt: Organic synthesis with enzymes - the only way This comprehensive set gives reliable answers to all questions on enzyme catalysis - from searching for suitable catalytic systems via choosing the optimal reaction conditions to implementing modern synthesis strategies. The long-awaited new edition has been greatly expanded to include new topics and to reflect the latest research, yet retains the clear and practice-oriented presentation found in the first edition. More than a mere data collection, the three volumes provide synthetic chemists with easy access to all the first-hand information necessary for successfully using enzymes: - the latest synthesis methods - example applications arranged according to reaction type - a table of all the important, commercially available enzymes - comprehensive registers for targeted searching according to enzyme, compound, or reaction - current references to the literature In short, an indispensable reference that should be on the shelf of every modern synthesis laboratory.