Kooperativer Bibliotheksverbund

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Umfang: 1 Online-Ressource (380 p.) , 101 b&w, ill

ISBN: 1847558763 , 9781847558763

Serie: RSC Biomolecular sciences v. 15

Anmerkung: Provides a perspective on nucleic acid-metal ion interactions with an emphasis on experimental biophysical studies which will prove indispensable to biophysicists and molecular biologists, Natural biochemical processes are routinely being discovered in living cells that involve RNA. Some of these processes, such as RNA interference, are now being exploited for biotechnology and medicinal applications. DNA has also proven in recent years to be more than a passive storehouse of information. For example, non-B-form DNA structures formed by G-rich DNA have been shown to participate in the regulation of gene expression, a discovery that presents new possibilities for drug targets in the genome. The current quest to understand how nucleic acid functions at the most fundamental level requires that we have a detailed understanding of nucleic acid-metal ion interactions. Because RNA and DNA are polyanions the structure and biological function of these biopolymers depends strongly on their association with metal ions. While this intimate connection between metal ions and nucleic function has been appreciated for decades, the noncovalent and dynamic nature of these interactions has continually presented challenges to the development of accurate and quantitative descriptions. Over the past few years the development of solution state spectroscopic techniques and the achievement of high resolution X-ray crystal structures have provided tremendous insights into the nature of nucleic acid-metal ion interactions, including direct evidence for their importance in determining nucleic acid structure, from the dictation of folding pathways followed by large RNA molecules to the subtle modulation of DNA groove widths. This new book provides a comprehensive review of the experimental studies that define our current understanding of nucleic acid-metal ion interactions with a particular ++ , emphasis being placed on experimental biophysical studies. However, the book is not merely a current review of the literature, as original material and fresh perspectives on published results are also presented. Particularly noteworthy topics include: -The chapter by Williams and fellow workers which reviews information provided by x-ray crystal structures and discusses what this information has revealed about the unique nature of Mg2+ interactions with RNA phosphate groups. The authors provide fresh insights, based upon structural comparisons, for how these interactions govern the local folding pathways of RNA. By dedicating separate chapters to the participation of metal ions in the kinetics and thermodynamics of RNA folding, this volume provides a more in depth treatise of both areas than is typically possible for reviews in which these two related, but distinct, topics are combined -Polyelectrolyte models of nucleic acids have proven to be extremely valuable for understanding the sequestering counterions in a so-called diffuse cloud around polymeric DNA. J. Michael Schurr provides a comprehensive review of polyanion models. of nucleic acid-metal ion interactions. Despite the success of polyelectrolyte models in describing some physical properties of nucleic acids, this topic is not always sufficiently understood by many researchers to make use of these models and this chapter serves as a valuable and up to date introduction to this topic. -The chapter by Pizarro and Sadler on metal ion-nucleic acid interactions in disease and medicine is complemented by a chapter by Lippert on coordinative bond formation between metal ions and nucleic acid bases. Together, these two chapters provide an overview of transition metal ion interactions with nucleic acids that illustrates the promise and peril that is associated with direct metal ion coordination to nucleic acid b++e , s in living cells. The book is sufficiently detailed to serve as a reference source for researchers active in the field of nucleic acids biophysics and molecular biology. In addition, chapter authors have added introductory material and enough background material in each chapter so that the book can also can serve as an entry point for students and researchers that have not previously worked in the field which will make the book of lasting value and more accessible by a wider audience

Sprache: Englisch

Fachgebiete: Chemie/Pharmazie

Schlagwort(e): Nucleinsäuren ; Metallion

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Umfang: 1 Online-Ressource (330 p.) , 59 b&w, ill

ISBN: 1847559980 , 9781847559982

Serie: RSC Biomolecular sciences v. 16

Anmerkung: This book, written by expert scientists in the field, analyses how diverse fields of scientific research interact on a specific example - RNA polymerases, The cell can be viewed as a 'collection of protein machines' and understanding these molecular machines requires sophisticated cooperation between cell biologists, geneticists, enzymologists, crystallographers, chemists and physicists. To observe these machines in action, researchers have developed entirely new methodologies for the detection and the nanomanipulation of single molecules. This book, written by expert scientists in the field, analyses how these diverse fields of research interact on a specific example - RNA polymerase. The book concentrates on RNA polymerases because they play a central role among all the other machines operating in the cell and are the target of a wide range of regulatory mechanisms. They have also been the subject of spectacular advances in their structural understanding in recent years, as testified by the attribution of the Nobel prize in chemistry in 2006 to Roger Kornberg. The book focuses on two aspects of the transcription cycle that have been more intensively studied thanks to this increased scientific cooperation - the recognition of the promoter by the enzyme, and the achievement of consecutive translocation steps during elongation of the RNA product. Each of these two topics is introduced by an overview, and is then presented by worldwide experts in the field, taking the viewpoint of their speciality. The overview chapters focus on the mechanism-structure interface and the structure-machine interface while the individual chapters within each section concentrate more specifically on particular processes-kinetic analysis, single-molecule spectroscopy, and termination of transcription, amongst others. Specific attention has been paid to the newcomers in the field, with ++ , careful descriptions of new emerging techniques and the constitution of an atlas of three-dimensional pictures of the enzymes involved. For more than thirty years, the study of RNA polymerases has benefited from intense cooperation between the scientific partners involved in the various fields listed above. It is hoped that a collection of essays from outstanding scientists on this subject will catalyse the convergence of scientific efforts in this field, as well as contribute to better teaching at advanced levels in Universities

Sprache: Englisch

Fachgebiete: Biologie

Schlagwort(e): DNS-abhängige-RNS-Polymerasen ; Aufsatzsammlung

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Umfang: 1 Online-Ressource (288 p.) , 44 b&w, ill

ISBN: 1847558283 , 9781847558282

Serie: RSC Biomolecular sciences v. 14

Anmerkung: This unique book covers all the modern approaches and the many advances experienced in the field of protein folding and aggregation during the last 10 years, Protein folding and aggregation is the process by which newly synthesized proteins fold into the specific three-dimensional structures defining their biologically active states. It has always been a major focus of research in biochemistry and has often been seen as the unsolved second part of the genetic code. In the last 10 years we have witnessed a quantum leap in the research in this exciting area. Computational methods have improved to the extent of making possible to simulate the complete folding process of small proteins and the early stages of protein aggregation. Experimental methods have evolved to permit resolving fast processes of folding reactions and visualizing single molecules during folding. The findings from these novel experiments and detailed computer simulations have confirmed the main predictions of analytical theory of protein folding. In summary, protein folding research has finally acquired the status of a truly quantitative science, paving the way for more exciting developments in the near future. This unique book covers all the modern approaches and the many advances experienced in the field during the last 10 years. There is also much emphasis on computational methods and studies of protein aggregation which have really flourished in the last decade. It includes chapters in the areas that have witnessed major developments and are written by top experts including:computer simulations of folding, fast folding, single molecule spectroscopy, protein design, aggregation studies (both computational and experimental). Readers will obtain a unique perspective of the problems faced in the biophysical study of protein conformational behaviour in aqueous solution and how these problems are be++ , ing solved with a multidisciplinary approach that combines theory, experiment and computer simulations. Protein Folding, Misfolding and Aggregation Classical Themes and Novel Approaches is essential reading for graduate students actively involved in protein folding research, other scientists interested in the recent progress of the field and instructors revamping the protein folding section of their biochemistry and biophysics courses

Sprache: Englisch

Fachgebiete: Biologie

Schlagwort(e): Proteinfaltung ; Aufsatzsammlung

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Umfang: 1 Online-Ressource (416 p.) , 109 b&w, ill

ISBN: 1847558267 , 9781847558268

Anmerkung: Written by a team of experts, this book bridges the gap between the DNA- and RNA- views of protein-nucleic acid recognition which are often treated as separate fields, The structural biology of protein-nucleic acid interactions is in some ways a mature field and in others in its infancy. High-resolution structures of protein-DNA complexes have been studied since the mid 1980s and a vast array of such structures has now been determined, but surprising and novel structures still appear quite frequently. High-resolution structures of protein-RNA complexes were relatively rare until the last decade. Propelled by advances in technology as well as the realization of RNA's importance to biology, the number of example structures has ballooned in recent years. New insights are now being gained from comparative studies only recently made possible due to the size of the database, as well as from careful biochemical and biophysical studies. As a result of the explosion of research in this area, it is no longer possible to write a comprehensive review. Instead, current review articles tend to focus on particular subtopics of interest. This makes it difficult for newcomers to the field to attain a solid understanding of the basics. One goal of this book is therefore to provide in-depth discussions of the fundamental principles of protein-nucleic acid interactions as well as to illustrate those fundamentals with up-to-date and fascinating examples for those who already possess some familiarity with the field. The book also aims to bridge the gap between the DNA- and the RNA- views of nucleic acid - protein recognition, which are often treated as separate fields. However, this is a false dichotomy because protein - DNA and protein - RNA interactions share many general principles. This book therefore includes relevant examples from both sides, and frames discussions of the , fundamentals in terms that are relevant to both. The monograph approaches the study of protein-nucleic acid interactions in two distinctive ways. First, DNA-protein and RNA-protein interactions are presented together. Second, the first half of the book develops the principles of protein-nucleic acid recognition, whereas the second half applies these to more specialized topics. Both halves are illustrated with important real life examples. The first half of the book develops fundamental principles necessary to understand function. An introductory chapter by the editors reviews the basics of nucleic acid structure. Jen-Jacobsen and Jacobsen discuss how solvent interactions play an important role in recognition, illustrated with extensive thermodynamic data on restriction enzymes. Marmorstein and Hong introduce the zoology of the DNA binding domains found in transcription factors, and describe the combinational recognition strategies used by many multiprotein eukaryotic complexes. Two chapters discuss indirect readout of DNA sequence in detail: Berman and Lawson explain the basic principles and illustrate them with in-depth studies of CAP, while in their chapter on DNA bending and compaction Johnson, Stella and Heiss highlight the intrinsic connections between DNA bending and indirect readout. Horvath lays out the fundamentals of protein recognition of single stranded DNA and single stranded RNA, and describes how they apply in a detailed analysis of telomere end binding proteins. Nucleic acids adopt more complex structures - Lilley describes the conformational properties of helical junctions, and how proteins recognize and cleave them. Because RNA readily folds due to the stabilizing role of its 2'-hydroxyl groups, Li discusses how proteins recognize different RNA folds, which include duplex RNA. With the fundamentals laid out, discussion turns to more specialized , examples taken from important aspects of nucleic acid metabolism. Schroeder discusses how proteins chaperone RNA by rearranging its structure into a functional form. Berger and Dong discuss how topoisomerases alter the topology of DNA and relieve the superhelical tension introduced by other processes such as replication and transcription. Dyda and Hickman show how DNA transposes mediate genetic mobility and Van Duyne discusses how site-specific recombinases "cut" and "paste" DNA. Horton presents a comprehensive review of the structural families and chemical mechanisms of DNA nucleases, whereas Li in her discussion of RNA-protein recognition also covers RNA nucleases. Lastly, Ferre-D'Amare shows how proteins recognize and modify RNA transcripts at specific sites. The book also emphasises the impact of structural biology on understanding how proteins interact with nucleic acids and it is intended for advanced students and established scientists wishing to broaden their horizons

Sprache: Englisch

Fachgebiete: Biologie

Schlagwort(e): Proteine ; Nucleinsäuren ; Wechselwirkung ; DNS ; Proteine ; Wechselwirkung ; DNS ; Proteinstoffwechsel ; Aufsatzsammlung

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