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Simulating Enzyme Reactivity
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Book Synopsis Simulating Enzyme Reactivity Computational Methods in Enzyme Catalysis by : John Maclane
Download or read book Simulating Enzyme Reactivity Computational Methods in Enzyme Catalysis written by John Maclane and published by Createspace Independent Publishing Platform. This book was released on 2017-06-07 with total page 446 pages. Available in PDF, EPUB and Kindle. Book excerpt: The simulation of enzymatic processes is a well-established field within computational chemistry, as demonstrated by the 2013 Nobel Prize in Chemistry. It has been attracting increasing attention in recent years due to the potential applications in the development of new drugs or new environmental-friendly catalysts. Featuring contributions from renowned authors, including Nobel Laureate Arieh Warshel, this book explores the theories, methodologies and applications in simulations of enzyme reactions. It is the first book offering a comprehensive perspective of the field by examining several different methodological approaches and discussing their applicability and limitations. The book provides the basic knowledge for postgraduate students and researchers in chemistry, biochemistry and biophysics, who want a deeper understanding of complex biological process at the molecular level.
Book Synopsis Simulating Enzyme Reactivity by : Inaki Tunon
Download or read book Simulating Enzyme Reactivity written by Inaki Tunon and published by Royal Society of Chemistry. This book was released on 2016-11-25 with total page 558 pages. Available in PDF, EPUB and Kindle. Book excerpt: Exploring the theories, methodologies and applications in simulations of enzymatic reactions, this book is a great resource for postgraduate students and researchers.
Book Synopsis Computer Modeling of Chemical Reactions in Enzymes and Solutions by : Arieh Warshel
Download or read book Computer Modeling of Chemical Reactions in Enzymes and Solutions written by Arieh Warshel and published by Wiley-Interscience. This book was released on 1991-11-29 with total page 264 pages. Available in PDF, EPUB and Kindle. Book excerpt: This practical reference explores computer modeling of enzyme reations--techniques that help chemists, biochemists and pharmaceutical researchers understand drug and enzyme action.
Book Synopsis Large Scale Simulation and Analysis to Understand Enzymatic Chemical Mechanisms by : Ishan Satish Patel
Download or read book Large Scale Simulation and Analysis to Understand Enzymatic Chemical Mechanisms written by Ishan Satish Patel and published by . This book was released on 2015 with total page 119 pages. Available in PDF, EPUB and Kindle. Book excerpt: The full stack approach, from Biochemical Network Simulation to Quantum Mechanics, is developed and utilized to understand in this thesis to understand enzymatic mechanism. The story falls into two segments that highlight two different aspects of enzymatic mechanisms. The first is the determination of the kinetic complexity of one full enzymatic turnover can affect the system in ways that cannot be predicted by simplistic simulations, as evidenced by differential hydrolysis rates of VX and Paraoxon in the enzyme PTE. Over 4M CPU hours of thermodynamic integration simulations were performed to obtain free energy profiles, as a function of up to 6 dimensions, along a reaction path determined through a combination of knowledge from physical organic chemistry, local energetic optimizations, and experimental information. The activation barriers were converted to reaction rates and simulated with mass action kinetics. The results show the slow-down in one turnover for the enzyme is not exactly the one with the "highest barrier" but is instead the result of non-preferential product-facing equilibrium. We also show that active site poisoning by VX opens up new pathways that are an overall detriment to the enzyme. The second is the uncovering of the drivers of enzymatic reactivity for a purely electronic Claisen rearrangement of Chorismate in CM, CM mutants, 1 F7 antibody, Solvent, and Vacuum. Utilizing Transition Path Sampling (TPS), we performed large scale simulations totaling over I OM CPU hours and 1000 TB of storage space to arrive at an understanding of the causation behind differential reactivity from a quantum mechanical orbital point of view. Our results suggest differential catalytic capacity is driven by, and correlates with, greater capacity to generate the forming bond, and for faster enzymes, greater capacity to disrupt the breaking bond. Further orbital level decompositions were performed that demonstrated disruption of the breaking bond allows greater catalytic gains because orbital symmetry prevents strong intermolecular electronic delocalization of the breaking bond electrons. Our evidence suggests a combination of catalyzing the departure from the reactant basin and the transport through the transition region are both reasons why the WT CM is an extremely capable catalyst.
Book Synopsis Computational Approaches to Biochemical Reactivity by : Gábor Náray-Szabó
Download or read book Computational Approaches to Biochemical Reactivity written by Gábor Náray-Szabó and published by Springer Science & Business Media. This book was released on 2006-04-11 with total page 386 pages. Available in PDF, EPUB and Kindle. Book excerpt: A quantitative description of the action of enzymes and other biological systems is both a challenge and a fundamental requirement for further progress in our und- standing of biochemical processes. This can help in practical design of new drugs and in the development of artificial enzymes as well as in fundamental understanding of the factors that control the activity of biological systems. Structural and biochemical st- ies have yielded major insights about the action of biological molecules and the mechanism of enzymatic reactions. However it is not entirely clear how to use this - portant information in a consistent and quantitative analysis of the factors that are - sponsible for rate acceleration in enzyme active sites. The problem is associated with the fact that reaction rates are determined by energetics (i. e. activation energies) and the available experimental methods by themselves cannot provide a correlation - tween structure and energy. Even mutations of specific active site residues, which are extremely useful, cannot tell us about the totality of the interaction between the active site and the substrate. In fact, short of inventing experiments that allow one to measure the forces in enzyme active sites it is hard to see how can one use a direct experimental approach to unambiguously correlate the structure and function of enzymes. In fact, in view of the complexity of biological systems it seems that only computers can handle the task of providing a quantitative structure-function correlation.
Book Synopsis Computer Simulations Of Enzymes by : Philip Hanoian
Download or read book Computer Simulations Of Enzymes written by Philip Hanoian and published by . This book was released on 2014 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Enzymes are proteins that perform the essential function of facilitating chemical reactions within living organisms, and the rate enhancements provided by enzymes are so significant that they remain a marvel for chemists today. The study of enzymes is thus pervaded by attempts to understand the precise mechanisms by which enzymes achieve these rate enhancements, with additional focus on the impressive level of specificity and selectivity these protein catalysts display as well. In this thesis, four studies on enzymatic systems are presented with the goal of further elucidating the mechanisms by which enzymes confer enormous rate enhancements to chemical reactions. In the first study, mixed quantum mechanical/molecular mechanical calculations are applied to study a series of phenolate inhibitors of increasing pKa bound to ketosteroid isomerase to explore the catalytically relevant hydrogen bonds in the enzyme active site. The second study uses molecular dynamics simulations to explore the use of water in the active site in lieu of the native enzymatic hydrogen bonds. The third study focuses on the positioning of the catalytic base in ketosteroid isomerase using molecular dynamics simulations, and this positioning is suggested to arise from non-local contributions involving nearby hydrophobic residues and an active site loop. In the final study, an additional enzyme, dihydrofolate reductase is examined, and empirical valence bond molecular dynamics simulations are applied to evaluate the free energy barriers of the wild-type enzyme and several evolutionarily motivated mutants. Overall, these studies help to further our understanding of enzymes and the roles of individual factors in enzyme catalysis.
Book Synopsis Enzyme Reactions and Enzyme Systems by : Charles Walter
Download or read book Enzyme Reactions and Enzyme Systems written by Charles Walter and published by . This book was released on 1976 with total page 226 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Quantum Medicinal Chemistry by : Paolo Carloni
Download or read book Quantum Medicinal Chemistry written by Paolo Carloni and published by John Wiley & Sons. This book was released on 2006-03-06 with total page 294 pages. Available in PDF, EPUB and Kindle. Book excerpt: Computational methods are transforming the work of chemical and pharmaceutical laboratories. Increasingly faster and more exact simulation algorithms have made quantum chemistry a valuable tool in the search for active substances. Written by a team of leading international quantum chemists, this book is aimed at both beginners as well as experienced users of quantum chemical methods. All commonly used quantum chemical methods are treated here, including Density Functional Theory, quantum and molecular mechanical approaches. Numerous examples illustrate the use of these methods for dealing with problems in pharmaceutical practice, whether the study of inhibitor binding, identifying the surface load of active substances or deriving molecular descriptors using quantum chemical tools. For anyone striving to stay ahead in this rapidly evolving field.
Book Synopsis The Dynamics of Enzymatic Reactions by : Lishan Yao
Download or read book The Dynamics of Enzymatic Reactions written by Lishan Yao and published by . This book was released on 2006 with total page 610 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Analysis of Key Effects in Enzyme-catalysed Reactions by QM/MM Simulations by :
Download or read book Analysis of Key Effects in Enzyme-catalysed Reactions by QM/MM Simulations written by and published by . This book was released on 2006 with total page 465 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Nanozymes: Next Wave of Artificial Enzymes by : Xiaoyu Wang
Download or read book Nanozymes: Next Wave of Artificial Enzymes written by Xiaoyu Wang and published by Springer. This book was released on 2016-07-27 with total page 134 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book describes the fundamental concepts, the latest developments and the outlook of the field of nanozymes (i.e., the catalytic nanomaterials with enzymatic characteristics). As one of today’s most exciting fields, nanozyme research lies at the interface of chemistry, biology, materials science and nanotechnology. Each of the book’s six chapters explores advances in nanozymes. Following an introduction to the rise of nanozymes research in the course of research on natural enzymes and artificial enzymes in Chapter 1, Chapters 2 through 5 discuss different nanomaterials used to mimic various natural enzymes, from carbon-based and metal-based nanomaterials to metal oxide-based nanomaterials and other nanomaterials. In each of these chapters, the nanomaterials’ enzyme mimetic activities, catalytic mechanisms and key applications are covered. In closing, Chapter 6 addresses the current challenges and outlines further directions for nanozymes. Presenting extensive information on nanozymes and supplemented with a wealth of color illustrations and tables, the book offers an ideal guide for readers from disparate areas, including analytical chemistry, materials science, nanoscience and nanotechnology, biomedical and clinical engineering, environmental science and engineering, green chemistry, and novel catalysis.
Book Synopsis Simulation of Enzyme Reactions by : Peter Vagedes
Download or read book Simulation of Enzyme Reactions written by Peter Vagedes and published by . This book was released on 2000 with total page 112 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Multi-scale Quantum Models for Biocatalysis by : Darrin M. York
Download or read book Multi-scale Quantum Models for Biocatalysis written by Darrin M. York and published by Springer Science & Business Media. This book was released on 2009-05-30 with total page 426 pages. Available in PDF, EPUB and Kindle. Book excerpt: “Multi-scale Quantum Models for Biocatalysis” explores various molecular modelling techniques and their applications in providing an understanding of the detailed mechanisms at play during biocatalysis in enzyme and ribozyme systems. These areas are reviewed by an international team of experts in theoretical, computational chemistry, and biophysics. This book presents detailed reviews concerning the development of various techniques, including ab initio molecular dynamics, density functional theory, combined QM/MM methods, solvation models, force field methods, and free-energy estimation techniques, as well as successful applications of multi-scale methods in the biocatalysis systems including several protein enzymes and ribozymes. This book is an excellent source of information for research professionals involved in computational chemistry and physics, material science, nanotechnology, rational drug design and molecular biology and for students exposed to these research areas.
Book Synopsis Theory and Applications of the Empirical Valence Bond Approach by : Fernanda Duarte
Download or read book Theory and Applications of the Empirical Valence Bond Approach written by Fernanda Duarte and published by John Wiley & Sons. This book was released on 2017-04-17 with total page 139 pages. Available in PDF, EPUB and Kindle. Book excerpt: A comprehensive overview of current empirical valence bond (EVB) theory and applications, one of the most powerful tools for studying chemical processes in the condensed phase and in enzymes. Discusses the application of EVB models to a broad range of molecular systems of chemical and biological interest, including reaction dynamics, design of artificial catalysts, and the study of complex biological problems Edited by a rising star in the field of computational enzymology Foreword by Nobel laureate Arieh Warshel, who first developed the EVB approach
Book Synopsis Quantum Tunnelling in Enzyme-catalysed Reactions by : Rudolf K. Allemann
Download or read book Quantum Tunnelling in Enzyme-catalysed Reactions written by Rudolf K. Allemann and published by Royal Society of Chemistry. This book was released on 2009 with total page 412 pages. Available in PDF, EPUB and Kindle. Book excerpt: In recent years, there has been an explosion in knowledge and research associated with the field of enzyme catalysis and H-tunneling. Rich in its breath and depth, this introduction to modern theories and methods of study is suitable for experienced researchers those new to the subject. Edited by two leading experts, and bringing together the foremost practitioners in the field, this up-to-date account of a rapidly developing field sits at the interface between biology, chemistry and physics. It covers computational, kinetic and structural analysis of tunnelling and the synergy in combining these methods (with a major focus on H-tunneling reactions in enzyme systems). The book starts with a brief overview of proton and electron transfer history by Nobel Laureate, Rudolph A. Marcus. The reader is then guided through chapters covering almost every aspect of reactions in enzyme catalysis ranging from descriptions of the relevant quantum theory and quantum/classical theoretical methodology to the description of experimental results. The theoretical interpretation of these large systems includes both quantum mechanical and statistical mechanical computations, as well as simple more approximate models. Most of the chapters focus on enzymatic catalysis of hydride, proton and H" transfer, an example of the latter being proton coupled electron transfer. There is also a chapter on electron transfer in proteins. This is timely since the theoretical framework developed fifty years ago for treating electron transfers has now been adapted to H-transfers and electron transfers in proteins. Accessible in style, this book is suitable for a wide audience but will be particularly useful to advanced level undergraduates, postgraduates and early postdoctoral workers.
Book Synopsis Computational Approaches for Studying Enzyme Mechanism Part A by :
Download or read book Computational Approaches for Studying Enzyme Mechanism Part A written by and published by Academic Press. This book was released on 2016-08-04 with total page 560 pages. Available in PDF, EPUB and Kindle. Book excerpt: Computational Approaches for Studying Enzyme Mechanism Part A, is the first of two volumes in the Methods in Enzymology series, focusses on computational approaches for studying enzyme mechanism. The serial achieves the critically acclaimed gold standard of laboratory practices and remains one of the most highly respected publications in the molecular biosciences. Each volume is eagerly awaited, frequently consulted, and praised by researchers and reviewers alike. Now with over 550 volumes, the series remains a prominent and essential publication for researchers in all fields of life sciences and biotechnology, including biochemistry, chemical biology, microbiology, synthetic biology, cancer research, and genetics to name a few. Focuses on computational approaches for studying enzyme mechanism Continues the legacy of this premier serial with quality chapters authored by leaders in the field Covers research methods in intermediate filament associated proteins, and contains sections on such topics as lamin-associated proteins, intermediate filament-associated proteins and plakin, and other cytoskeletal cross-linkers
Book Synopsis Understanding and Improving Designed Enzymes by Computer Simulations by : Asmit Bhowmick
Download or read book Understanding and Improving Designed Enzymes by Computer Simulations written by Asmit Bhowmick and published by . This book was released on 2016 with total page 110 pages. Available in PDF, EPUB and Kindle. Book excerpt: Abstract Understanding and Improving Designed Enzymes by Computer Simulations By Asmit Bhowmick Doctor of Philosophy in Chemical Engineering University of California, Berkeley Professor Teresa Head-Gordon, Chair The ability to control for protein structure, electrostatics and dynamical motions is a fundamental problem that limits our ability to rationally design catalysts for new chemical reactions not known to have a natural biocatalyst. Current computational approaches for de novo enzyme design seek to engineer a small catalytic construct into an accommodating protein scaffold as exemplified by the Rosetta strategy. Here we consider 3 designed enzymes for the Kemp elimination reaction (KE07, KE70 and KE15) that showed minimal catalytic activity. KE07 and KE70 were subsequently improved by 2 orders of magnitude in catalytic efficiency by directed evolution and highlighted the shortcomings of the design process. This work studies two keys issues plaguing the designs - side chain conformational variability and electrostatics. For the first part, a new Monte Carlo sampling method was developed that uses a physical forcefield and coupled with backbone variability and a backbone dependent rotamer library. Using transition state theory with energies/entropies calculated from Monte Carlo simulations, it is shown that in both KE07 and KE70, the initial design was over-optimized to stabilize the enzyme-substrate complex. Mutations introduced by directed evolutions led to destabilization of the enzyme-substrate complex and stabilization of the transition state. Furthermore, analysis of residue correlations via mutual information yielded hotspots, several of which were mutations during directed evolution. Laboratory mutations of these hotspots in the best variant of KE07 led to a drop in catalytic performance, demonstrating their importance. The metrics identified in KE07/KE70 studies were used to predict mutations to improve enzyme KE15 that had not been improved prior to this study. Several mutants, all predicted through computer simulations have now yielded better catalytic activity in the laboratory with the best one 10-fold better than the starting enzyme. In order to quantify the role of electrostatics, a new method was developed using the AMOEBA polarizable forcefield that allowed splitting the contribution of electric field at the substrate by residues and solvent. The improvement in KE07 series could be tracked directly through changes in electric field at the substrate. In comparison, KE70 did not show a significant shift in electrostatic field, suggesting other factors like substrate binding may have been the reason for enhancement of activity. However, the common theme in both enzymes was the lack of participation (and in fact detrimental role) of the scaffold in the reaction. Future design efforts would benefit from an expanded theozyme and careful selection of scaffold based on electrostatic properties. Generating efficient biocatalysts without using laboratory directed evolution would be an inflection point in the field of enzyme design. This work is a step in that direction.
