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  • 1
    Keywords: Quantum biochemistry ; Catalysis ; Tunneling (Physics) ; Enzymes ; Quantenbiochemie ; Biokatalyse
    Description / Table of Contents: This accessible introduction to modern theories of enzyme catalysis presents the latest methods for studying quantum tunnelling in biological systems, 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
    Type of Medium: Online Resource
    Pages: 410 p , Online-Ressource , 97 b&w, ill
    Edition: RSC eBook Collection 1968-2009
    ISBN: 1847559972 , 9781847559975
    Series Statement: RSC Biomolecular sciences v. 18
    DDC: 530.416
    RVK:
    Language: English
    Note: Ebook , Introduction. Preface: Beyond the Historical Perspective on Hydrogen and Electron Transfers. Chapter 1: The Transition State Theory Description of Enzyme Catalysis for Classically Activated Reactions: Introduction-- Quantifying the Catalytic Activity of Enzymes-- Free Energy Analysis of Enzyme Catalysis-- Transition State Stabilisation or Ground State Destabilisation?-- Selective Stabilisation of Transition Structures by Enzymes-- Enzyme Flexibility and Dynamics. Chapter 2: Introduction to Quantum Behavior - A Primer: Introduction-- Classical Mechanics-- Quantum Mechanics-- Heisenberg Uncertainty Principle-- The Schrodinger Equation-- Electronic Structure Calculations-- Born-Oppenheimer Approximation-- Hartree-Fock Theory-- Basis sets-- Zero-point Energy-- Density Functional Theory-- DFT Calculations of Free Energies of Activation of Enzyme Models-- DFT Calculations of Kinetic Isotope Effects-- Quantum Mechanics/Molecular Mechanics Methods-- Summary and Outlook. Chapter 3: Quantum Catalysis in Enzymes: Introduction-- Theory-- Variational Transition State Theory-- The Transmission Coefficient-- One-Dimensional Tunneling-- Multidimensional Tunneling-- Ensemble Averaging-- Examples-- Liver Alcohol Dehydrogenase-- Dihydrofolate Reductase-- Soybean-Lipoxygenase-1 and Methylmalonyl-CoA Mutase-- Other Systems and Perspectives-- Concluding Remarks. Chapter 4: Selected Theoretical Models and Computational Methods for Enzymatic Tunneling: Introduction-- Vibronically Nonadiabatic Reactions: Proton-coupled Electron Transfer-- Theory-- Application to Lipoxygenase-- Predominantly Adiabatic Reactions: Proton and Hydride Transfer-- Theory-- Application to Dihydrofolate Reductase-- Emerging Concepts About Enzyme Catalysis. Chapter 5: Kinetic Isotope Effects from Hybrid Classical and Quantum Path Integral Computations: Introduction-- Theoretical Background-- Path Integral Quantum Transition State Theory-- Centroid Path Integral Simulations-- Kinetic Isotope Effects-- Sequential Centroid Path Integral and Umbrella Sampling (PI/UM)-- The PI-FEP/UM Method-- Kleinert's Variational Perturbation (KP) Theory-- Potential Energy Surface-- Combined QM/MM Potentials-- The MOVB Potential-- Computational Details-- Illustrative Examples-- Proton Transfer between Viscosity-- Multiple Reactive Configurations and a Place for Single-Molecule Measurements. Chapter 10. Computational Simulations of Tunnelling Reactions in Enzymes-- Introduction-- Molecular Mechanical Methods-- Quantum Mechanical Methods-- Combined Quantum Mechanical/Molecular Mechanical Methods-- Improving Semiempirical QM Calculations-- Calculation of Potential Energy Surfaces and Free Energy Surfaces-- Simulation of the H-tunnelling Event-- Calculation of H-tunnelling Rates and Kinetic Isotope Effects-- Analysing Molecular Dynamics Trajectories-- A Case Study: Aromatic Amine Dehydrogenase (AADH)-- Preparation of the System-- Analysis of the H-tunnelling Step in AADH-- Analysis of the Role of Promoting Motions in Driving Tunnelling-- Comparison of Short-range Motions in AADH with Long Range Motions in Dihydrofolate Reductase-- Summary. Chapter 11. Tunneling Does Not Contribute Significantly to Enzyme Catalysis, But Studying Temperature Dependence of Isotope Effects is Useful-- Introduction-- Methods-- Simulating Temperature Dependence of KIEs in Enzymes-- Concluding Remarks. Chapter 12: The Use of X-Ray Crystallography to Study Enzymic H-Tunnelling-- Introduction-- X-Ray Crystallography: A Brief Overview-- Accuracy of X-Ray Diffraction Structures-- Dynamic Information from X-Ray Crystallography-- Examples of H-tunnelling Systems Studied by Crystallography-- Crystallographic Studies of AADH Catalytic Mechanism-- Crystallographic Studies of MR-- Conclusions. Chapter 13: The Strengths and Weaknesses of Model Reactions for the Assessment of Tunneling in Enzymic Reactions-- Model Reactions for Biochemical Processes-- Model Reactions Relevant to Enzymic Tunneling-- Isotope Effect Temperature Dependences and the Configurational-Search Framework (CSF) for their Interpretation-- The Traditionally Dependent Category-- The Underdependent Tunneling Category-- The Overdependent Tunneling Category-- Example 1. Hydride Transfer in a Thermophilic Alcohol Dehydrogenase-- The Kirby-Walwyn Intramolecular Model Reaction-- The Powell-Bruice Tunneling Model Reaction-- Enzymic Tunneling in Alcohol Dehydrogenases-- Model Reactions and the Catalytic Power of Alcohol Dehydrogenase-- Example 2. Hydrogen-atom Transfer in Methylmalonyl Coenzyme A Mutase (MCM)-- Non-enzymic Tunneling in the Finke Model Reactions for MCM-- Enzymic Tunneling in MCM-- Model Reactions and MCM Catalytic Power-- The Roles of Theory in the Comparison of Model and Enzymic Reactions-- Model Reactions, Enzymic Accelerations, and Quantum Tunneling. Chapter 14: Long-Distance Electron Tunneling in Proteins: Introduction-- Electronic Coupling and Tunneling Pathways-- Direct Method-- Avoided Crossing-- Application of Koopmans' Theorem-- Generalized Mulliken-Hush Method-- The Propagator Method-- Protein Pruning-- Tunneling Pathways-- The Method of Tunneling Currents-- General Relations-- Many-Electron Picture-- Calculation of Current Density. Hartree-Fock Approximation-- Interatomic Tunneling Currents-- Many-Electron Aspects-- One Tunneling Orbital (OTO) Approximation and Polarization Effects-- The Limitation of the SCF Description of Many-Electron Tunneling-- Correlation Effects. Polarization Cloud Dynamics. Beyond Hartree-Fock Methods-- Quantum Interference Effects. Quantized Vertices-- Electron Transfer or Hole Transfer? Exchange Effects-- Dynamical Aspects.Chapter 15. Proton-coupled Electron Transfer: The Engine that Drives Radical Transport and Catalysis in Biology-- Introduction-- PCET Model Systems-- Unidirectional PCET Networks-- Bidirectional PCET Networks-- PCET Biocatalysis-- PCET in Enzymes: A Study of Ribonucleotide Reductase-- The PCET Pathway in RNR-- PCET in the ?2 Subunit of RNR-- PCET in ?2 Subunit of RNR: PhotoRNRs-- A Model for PCET in RNR-- Concluding Remarks.
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  • 2
    Description / Table of Contents: With contributions from experts in the field, this book provides a comprehensive overview of the oxidative folding of cysteine-rich peptides, The formation of disulfide bonds is probably the most influential modification of peptides and proteins. An elaborate set of cellular machinery exists to catalyze and guide this process. In recent years, significant developments have been made in both our understanding of the in vivo situation and the in vitro manipulation of disulfide bonds. This is the first monograph to provide a comprehensive overview of this exciting and rapidly developing area. It offers in-depth insights into the mechanisms of in vivo and in vitro oxidative folding of proteins as well as mono- and multiple-stranded peptides. Procedures applied for laboratory and industrial purposes are also discussed by top experts in the field. The book describes the enzymes involved in the correct oxidative folding of cysteine-containing proteins in prokaryotes and eukaryotes. It then goes on to discuss the mimicking of these enzymes for successful in vitro folding of proteins (including synthetic replicates) and to deal with important issues concerning cysteine-rich peptides. The ability of natural bioactive peptides to fold correctly, and in high yields, to form defined structural motifs using cysteine sequence patterns is still puzzling. With this in mind, synthetic procedures for establishing native cysteine frameworks are discussed using selected examples, such as the potential of selenocysteines. The biotechnological and pharmaceutical relevance of proteins, peptides, their variants and synthetic replicates is continuously increasing. Consequently, this book is invaluable for peptide and protein chemists involved in related research and production
    Type of Medium: Online Resource
    Pages: 448 p , Online-Ressource , 57 b&w, 51 b&w halftones, line drawings
    Edition: RSC eBook Collection 1968-2009
    Series Statement: RSC Biomolecular sciences v. 16
    Language: English
    Note: Ebook , Preface. Foreword. Chapter 1. Oxidative Folding of Proteins in Vivo: Thioredoxins and the regulation of redox conditions in prokaryotes-- Dsb A B-- Eucaryotic PDIs-- Structure of Ero1/oxidation in the ER-- Oxidative folding in the ER-- Oxidative protein folding in mitochondria-- Cellular responses to redox stress-- Harnessing disulfide bond formation in the periplasm of bacteria for recombinant protein production. Chapter 2. Oxidative Folding of Proteins in vitro: The role of disulfide bonds for folding and stability of proteins-- Strategies for the oxidative refolding of disulfide-bonded proteins. Chapter 3. Redox potentials of cysteine residues in peptides and proteins: Methods for their determination. Chapter 4. Engineering disulfide bonds. Chapter 5. Selenocysteine as a probe of oxidative protein folding. Chapter 6. Oxidative Folding of Peptides in vitro: Oxidative folding of single-stranded disulfide-rich Peptides-- Regioselective disulfide formation-- Folding motifs of cysteine-rich peptides-- Double-stranded cysteine-peptides-- Multiple-strand cysteine-peptides. Chapter 7. Cysteine-based scaffolds for functional miniature proteins. Chapter 8. Selenocystine-peptides - Synthesis, folding and applications.
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  • 3
    Online Resource
    Online Resource
    La Vergne :RSC,
    Keywords: Electronic books.
    Description / Table of Contents: This accessible introduction to modern theories of enzyme catalysis presents the latest methods for studying quantum tunnelling in biological systems.
    Type of Medium: Online Resource
    Pages: 1 online resource (404 pages)
    Edition: 1st ed.
    ISBN: 9781847559975
    Series Statement: ISSN Series
    Language: English
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  • 4
    Online Resource
    Online Resource
    La Vergne :Royal Society of Chemistry, The,
    Keywords: Ciencias políticas. -- Gobierno. ; Political Science. -- Government. ; Ciencias sociales. -- Estudios de géneros. ; Social Science. -- Gender studies. ; Electronic books.
    Description / Table of Contents: This accessible introduction to modern theories of enzyme catalysis presents the latest methods for studying quantum tunnelling in biological systems.
    Type of Medium: Online Resource
    Pages: 1 online resource (404 pages)
    Edition: 1st ed.
    ISBN: 9781847559975
    Series Statement: Issn Series
    DDC: 530.416
    Language: English
    Note: 9780854041220_Publicity -- i_iv -- v_xiv -- xv_xvi -- xvii_xxvi -- 001_017r -- 018_035r -- 036_078r -- 079_104r -- 105_131r -- 132_160r -- 161_178r -- 179_198r -- 199_218r -- 219_241r -- 242_267r -- 268_290r -- 291_313r -- 314_344r -- 345_377r.
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  • 5
    Online Resource
    Online Resource
    La Vergne :RSC,
    Keywords: Electronic books.
    Description / Table of Contents: With contributions from experts in the field, this book provides a comprehensive overview of the oxidative folding of cysteine-rich peptides.
    Type of Medium: Online Resource
    Pages: 1 online resource (452 pages)
    Edition: 1st ed.
    ISBN: 9781847559265
    Series Statement: ISSN Series
    Language: English
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  • 6
    ISSN: 1520-4995
    Source: ACS Legacy Archives
    Topics: Biology , Chemistry and Pharmacology
    Type of Medium: Electronic Resource
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  • 7
    Electronic Resource
    Electronic Resource
    s.l. : American Chemical Society
    Journal of the American Chemical Society 110 (1988), S. 5555-5560 
    ISSN: 1520-5126
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
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  • 8
    Electronic Resource
    Electronic Resource
    [s.l.] : Nature Publishing Group
    Nature 365 (1993), S. 530-532 
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] Decarboxylation of oxaloacetate is the final reaction in the Rozzell process for the industrial synthesis of phenylalanine9. This process achieves decarboxylation by means of a natural enzyme (an oxaloacetate decarboxylase) that requires a metal ion as a cofactor10. Because industrial processes may ...
    Type of Medium: Electronic Resource
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