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"The authors represent most of the key figures and the work and the book as a whole is an essential reference for the newcomer or specialist in this area and for any student of eukaryotic cell structure and function. This is an important and wonderful reference." –Microbiology Today, May 2009 Septins are an evolutionarily conserved group of GTP-binding and filament-forming proteins that were originally discovered in yeast. Once the preserve of a small band of yeast biologists, the field has grown rapidly in the past few years and now encompasses the whole of animal and fungal biology. Furthermore, septins are nowadays recognized to be involved in a variety of disease processes from neoplasia to neurodegenerative conditions. This book comprehensively examines the septin gene family and their proteins, providing those new to this research area with a detailed and wide ranging introduction to septin biology. It starts with a unique historical perspective on the development of the field, from its beginnings in the screen for cell division mutants by the Nobel Laureate Lee Hartwell. The evolution of the septin gene family then forms a basis for consideration of the biochemistry and functions of septins in yeast and other model organisms including C. elegans and Drosophila. A major part of the book considers the diversity of septins in mammals, their functions and properties as well as their involvement in normal and abnormal cellular states, followed by a speculative overview from the editors of the key questions in septin research and of where the field may be headed. In addition, several appendices summarise important information for those in, or just entering, the field, e.g. nomenclature and septin and septin-like sequences. This book is an essential source of reference material for researchers in septin biology, cell biology, genetics and medicine, in particular pathology, including areas of neurobiology, oncology, infectious disease and developmental biology.
Together with the microfilament, microtubule and intermediate-filament networks, septins constitute an integral part of the eukaryotic cytoskeleton. Historically identified as proteins critical for septum formation in the budding yeast Saccharomyces cerevisiae, septin family GTPases are expressed and participate in the process of cytokinesis in most eukaryotes except higher plants. More than a dozen septin genes in mammals, together with various splice variants displaying tissue-specific expression patterns and flexible hetero-polymeric higher-order assembly achieve an unfathomable complexity superior to the other cytoskeletal components. Even though the initial studies in the septin field was restricted to their evolutionarily conserved role in cell division, strong expression of septins in the non-dividing cells of the brain generated great interest in understanding their role in neuronal morphogenesis and other aspects of cellular function. On one hand, recent developments indicate complex non-canonical roles for septins in diverse processes ranging from neuronal development to immune response and calcium signaling. On the other hand several lines of data including those from knockout models question the universal role for septins in animal cell cytokinesis. Mammalian hematopoietic cells seem to proliferate and efficiently undergo cytokinesis in the absence of pivotal septin proteins in a context-dependent manner. The lack of septin-dependence of hematopoiesis also opens the possibility of safely targeting septin-dependent cytokinesis for solid-tumor therapy. Thus the septin field is perfectly poised with novel roles for septins being discovered and the basic understanding on septin assembly and its canonical functions constantly revisited. The objective of this research topic was to provide an exclusive platform for discussing these rapid advances in the septin field. With a mixture of reviews and research articles encompassing diverse areas of septin research, ranging from the humble yeast model to human cancer, this ebook will be an interesting reading material for both experts as well as new comers to the septin field.
Septins provides established septin and molecular and developmental biologists and researchers new to the field with proven, state-of-art techniques and relevant historical background and theory to aid efficient design and effective implementation of experimental methodologies. Topics include the purification of septin proteins from diverse systems, their visualization in live cells, and their analysis by a variety of cutting-edge microscopy approaches. - Provides the latest information on septins - Includes both established and new technologies - Brings together specialists from the field who contribute their expertise
New and Future Developments in Microbial Biotechnology and Bioengineering presents an account of recent developments and applied aspects of fungi and its metabolites for human welfare. The fungi and its metabolites are employed in diverse fields of agri-food, biochemistry, chemical engineering, diagnostics, pharmaceuticals and medical device development. The book contains chapters by the eminent researchers working with fungi and fungal metabolites who explain their importance and potential in manifold prospects. The book includes a description of various fungal metabolites and their chemistry and biotechnology. - Highlights the latest developments surrounding the utilization of fungi and fungal metabolites - Overviews applied aspects of fungi and their metabolites for human welfare - Details the usage of fungi and their metabolites in diverse fields - Identifies the importance and potential of fungi and fungal metabolites in manifold prospects - Illustrates recent trends in fungal metabolite research using elaborate, expressive tables and figures with concise information
SNARE proteins mediate the docking and/or fusion of the vesicle with the plasma membrane. However, it is not clearly understood how this process is regulated. In a search for potential SNARE regulators, we have identified a novel snare interacting protein, the septin CDCrel-1. Septins were first identified as filamentous proteins required for cytokinesis in yeast. However, in mammals little is known about their functions. I show here that cdcrel-1 is predominantly expressed in the brain where it associates with membranes via binding to syntaxin 1A. Wildtype CDCrel-1 transfected into HIT-T15 cells inhibits secretion while mutated forms of CDCrel-1 potentiate secretion, suggesting that cdcrel-1 may be regulating vesicle targeting and/or fusion events. I further map the CDCrel-1 domains important for syntaxin binding and investigate the ability of CDCrel-1 to bind to syntaxin when in various SNARE complexes. CDCrel-1 can bind syntaxin in a SNARE complex, but its binding is occluded by alpha-SNAP. This suggests that CDCrel-1 may act as a novel filamentous element, regulating the delivery and/or fusion of vesicles to the presynaptic membrane through its interaction with syntaxin and the 7S complex. The regulation of filaments may be via post-translational modifications. Indeed we have discovered a novel interaction between SUMO E3 PIAS proteins and CDCrel-1. The conjugation of SUMO to substrates is dependent upon an E1 and E2, whereas specificity is mediated by an E3. Although several SUMO-1 substrates have been characterized, conjugation solely by SUMO-2/3 has not been described. Here I describe the colocalization of CDCrel-1 with SUMO-2 and 3 but not SUMO-1. Transfection of SUMO-2/3 but not SUMO-1 causes a reorganization of CDCrel-1 distribution in CHO cells. Furthermore, CDCrel-1 sequesters the nuclear pool of SUMO-2/3 and of the E2 Ubc9 but not SUMO1 into the cytoplasm. Sumoylation of CDCrel-l is shown in vivo and putative SUMO modification sites on CDCrel-1 are investigated by deletion of lysine residues. These experiments strongly suggest that CDCrel-1 is sumoylated specifically by SUMO-2/3. Sumoylation of CDCrel-1 may therefore play a regulatory role in secretion and septin filament formation. Future work will be aimed at determining the functional significance of SUMO modified CDCrel-1.
"It is said if you take care of the pennies, the pounds will take care of themselves. Richard Burton's excellent book takes this approach to calculations applied to the biomedical sciences...This is certainly interesting and engaging but it avoids being complicated." –Journal of Biological Education, April 2009 Biomedical Calculations: Principles and Practice is an accessible, student-friendly introduction to calculating, applying formulae and solving quantitative problems within these subjects. This book targets a problem area for many students and aims to give them the confidence which they are so often lacking when undertaking scientific calculations. It takes a unique approach to the subject and uses unit analysis as a central theme throughout the book to enhance student understanding. Clearly structured throughout, little basic knowledge of mathematics is assumed, but even the most numerate readers will be interested in the sometimes-novel biological detail. Numerous worked examples, supplementary questions and practice problems are provided and although the book is written to be read in sequence, it will also be a useful reference. The central theme of the book focuses on the value of unit analysis in solving quantitative problems, with explanations on how to avoid errors in calculations and in checking, understanding and deriving formulae and equations. As a background to this, there is extensive treatment of physical units, both individually (e.g. kg, m, mmol) and in combination (e.g. m s ̄2, mmol L ̄1), and also of other aspects of quantitative thinking. A variety of topics (mostly from physiology, pharmacology and biochemistry) are used to demonstrate these calculations in practice. Key features: An accessible, student-friendly introduction for all those hesitant in calculating, applying formulae and solving quantitative problems An innovative approach to scientific calculations and how to work with unfamiliar formulae for the biomedical and life sciences Includes modern, up to date definition of pH eliminating the need for logarithms and a discussion of the importance of pH Clear introduction on how to use the book, guidance on units and unit conversion, and an appendix on basic mathematics and notation Use of unit analysis as a central theme Includes numerous worked examples and supplementary questions throughout the text to enhance student understanding
Biological processes are driven by complex systems of functionally interacting signaling molecules. Thus, understanding signaling molecules is essential to explain normal or pathological biological phenomena. A large body of clinical and experimental data has been accumulated over these years, albeit in fragmented state. Hence, systems biological approaches concomitant with the understanding of each molecule are ideal to delineate signaling networks/pathways involved in the biologically important processes. The control of these signaling pathways will enrich our healthier life. Currently, there are more than 30,000 genes in human genome. However, not all the proteins encoded by these genes work equally in order to maintain homeostasis. Understanding the important signaling molecules as completely as possible will significantly improve our research-based teaching and scientific capabilities. This encyclopedia presents 350 biologically important signaling molecules and the content is built on the core concepts of their functions along with early findings written by some of the world’s foremost experts. The molecules are described by recognized leaders in each molecule. The interactions of these single molecules in signal transduction networks will also be explored. This encyclopedia marks a new era in overview of current cellular signaling molecules for the specialist and the interested non-specialist alike During past years, there were multiple databases to gather this information briefly and very partially. Amidst the excitement of these findings, one of the great scientific tasks of the coming century is to bring all the useful information into a place. Such an approach is arduous but at the end will infuse the lacunas and considerably be a streamline in the understanding of vibrant signaling networks. Based on this easy-approach, we can build up more complicated biological systems.
Calcium Entry Channels in Non-Excitable Cells focuses on methods of investigating the structure and function of non-voltage gated calcium channels. Each chapter presents important discoveries in calcium entry pathways, specifically dealing with the molecular identification of store-operated calcium channels which were reviewed by earlier volumes in the Methods in Signal Transduction series. Crystallographic and pharmacological approaches to the study of calcium channels of epithelial cells are also discussed. Calcium ion is a messenger in most cell types. Whereas voltage gated calcium channels have been studied extensively, the non-voltage gated calcium entry channel genes have only been identified relatively recently. The book will fill this important niche.