Download or read book The Mechanism of Lipid Bilayer Disruption by the Human Antimicrobial Peptide LL 37 written by Katherine Anne Henzler Wildman and published by . This book was released on 2003 with total page 660 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Fragments of the Human Antimicrobial LL 37 and Their Interaction with Model Membranes written by Claudia Dannehl and published by . This book was released on 2013 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: A detailed description of the characteristics of antimicrobial peptides (AMPs) is highly demanded, since the resistance against traditional antibiotics is an emerging problem in medicine. They are part of the innate immune system in every organism, and they are very efficient in the protection against bacteria, viruses, fungi and even cancer cells. Their advantage is that their target is the cell membrane, in contrast to antibiotics which disturb the metabolism of the respective cell type. This allows AMPs to be more active and faster. The lack of an efficient therapy for some cancer types and the evolvement of resistance against existing antitumor agents make AMPs promising in cancer therapy besides being an alternative to traditional antibiotics. The aim of this work was the physical-chemical characterization of two fragments of LL-37, a human antimicrobial peptide from the cathelicidin family. The fragments LL-32 and LL-20 exhibited contrary behavior in biological experiments concerning their activity against bacterial cells, human cells and human cancer cells. LL-32 had even a higher activity than LL-37, while LL-20 had almost no effect. The interaction of the two fragments with model membranes was systematically studied in this work to understand their mode of action. Planar lipid films were mainly applied as model systems in combination with IR-spectroscopy and X-ray scattering methods. Circular Dichroism spectroscopy in bulk systems completed the results. In the first approach, the structure of the peptides was determined in aqueous solution and compared to the structure of the peptides at the air/water interface. In bulk, both peptides are in an unstructured conformation. Adsorbed and confined to at the air-water interface, the peptides differ drastically in their surface activity as well as in the secondary structure. While LL-32 transforms into an [alpha]-helix lying flat at the water surface, LL-20 stays partly unstructured. This is in good agreement with the high antimicrobial activity of LL-32. In the second approach, experiments with lipid monolayers as biomimetic models for the cell membrane were performed. It could be shown that the peptides fluidize condensed monolayers of negatively charged DPPG which can be related to the thinning of a bacterial cell membrane. An interaction of the peptides with zwitterionic PCs, as models for mammalian cells, was not clearly observed, even though LL-32 is haemolytic. In the third approach, the lipid monolayers were more adapted to the composition of human erythrocyte membranes by incorporating sphingomyelin (SM) into the PC monolayers. Physical-chemical properties of the lipid films were determined and the influence of the peptides on them was studied. It could be shown that the interaction of the more active LL-32 is strongly increased for heterogeneous lipid films containing both gel and fluid phases, while the interaction of LL-20 with the monolayers was unaffected. The results indicate an interaction of LL-32 with the membrane in a detergent-like way. Additionally, the modelling of the peptide interaction with cancer cells was performed by incorporating some negatively charged lipids into the PC/SM monolayers, but the increased charge had no effect on the interaction of LL-32. It was concluded, that the high anti-cancer activity of the peptide originates from the changed fluidity of cell membrane rather than from the increased surface charge. Furthermore, similarities to the physical-chemical properties of melittin, an AMP from the bee venom, were demonstrated.

Download or read book Advances in Planar Lipid Bilayers and Liposomes written by Ales Iglic and published by Academic Press. This book was released on 2012-09-04 with total page 358 pages. Available in PDF, EPUB and Kindle. Book excerpt: Advances in Planar Lipid Bilayers and Liposomes volumes cover a broad range of topics, including main arrangements of the reconstituted system, namely planar lipid bilayers as well as spherical liposomes. The invited authors present the latest results of their own research groups in this exciting multidisciplinary field. Incorporates contributions from newcomers and established and experienced researchers Explores the planar lipid bilayer systems and spherical liposomes from both theoretical and experimental perspectives Serves as an indispensable source of information for new scientists

Download or read book Peptide Lipid Interactions written by Sidney A. Simon and published by Academic Press. This book was released on 2002-11-13 with total page 606 pages. Available in PDF, EPUB and Kindle. Book excerpt: This volume contains a comprehensive overview of peptide-lipid interactions by leading researchers. The first part covers theoretical concepts, experimental considerations, and thermodynamics. The second part presents new results obtained through site-directed EPR, electron microscopy, NMR, isothermal calorimetry, and fluorescence quenching. The final part covers problems of biological interest, including signal transduction, membrane transport, fusion, and adhesion. Key Features * world-renowned experts * state-of-the-art experimental methods * monolayers, bilayers, biological membranes * theoretical aspects and computer simulations * rafts * synaptic transmission * membrane fusion * signal transduction

Download or read book Antimicrobial Peptides written by Katsumi Matsuzaki and published by Springer. This book was released on 2019-04-12 with total page 304 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book presents an overview of antimicrobial peptides (AMPs), their mechanisms of antimicrobial action, other activities, and various problems that must still be overcome regarding their clinical application. Divided into four major parts, the book begins with a general overview of AMPs (Part I), and subsequently discusses the various mechanisms of antimicrobial action and methods for researching them (Part 2). It then addresses a range of activities other than antimicrobial action, such as cell penetration, antisepsis, anticancer, and immunomodulatory activities (Part 3), and explores the prospects of clinical application from various standpoints such as the selective toxicity, design, and discovery of AMPs (Part 4). A huge number of AMPs have been discovered in plants, insects, and vertebrates including humans, and constitute host defense systems against invading pathogenic microorganisms. Consequently, many attempts have been made to utilize AMPs as antibiotics. AMPs could help to solve the urgent problem of drug-resistant bacteria, and are also promising with regard to sepsis and cancer therapy. Gathering a wealth of information, this book will be a bible for all those seeking to develop antibiotics, anti-sepsis, or anticancer agents based on AMPs.

Download or read book Insect Immunity written by Dan Hultmark and published by . This book was released on 1982 with total page 98 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Diffraction and Spectroscopic Methods in Electrochemistry written by and published by John Wiley & Sons. This book was released on 2009-04-22 with total page 445 pages. Available in PDF, EPUB and Kindle. Book excerpt: This ninth volume in the series concentrates on in situ spectroscopic methods and combines a balanced mixture of theory and applications, making it highly readable for chemists and physicists, as well as for materials scientists and engineers. As with the previous volumes, all the chapters continue the high standards of this series, containing numerous references to further reading and the original literature, for easy access to this new field. The editors have succeeded in selecting highly topical areas of research and in presenting authors who are leaders in their fields, covering such diverse topics as diffraction studies of the electrode-solution interface, thin organic films at electrode surfaces, linear and non-linear spectroscopy as well as sum frequency generation studies of the electrified solid-solution interface, plus quantitative SNIFTIRS and PM-IRRAS. Special attention is paid to recent advances and developments, which are critically and thoroughly discussed. The result is a compelling set of reviews, serving equally well as an excellent and up-to-date source of information for experienced researchers in the field, as well as as an introduction for newcomers.

Download or read book Antimicrobial Peptides written by David A. Phoenix and published by John Wiley & Sons. This book was released on 2013-04-01 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: In this text, the small team of expert authors presents the field in a comprehensive and accessible manner that is well suited for students and junior researchers. The result is a highly readable and systematically structured introduction to antimicrobial peptides, their structure, biological function and mode of action. The authors point the way towards a rational design of this potentially highly effective new class of clinical antibiotics on the brink of industrial application. They do this by discussing their design principles, target membranes and structure-activity relationships. The final part of the book describes recent successes in the application of peptides as anticancer agents.

Download or read book Biomembranes written by Robert B. Gennis and published by Springer Science & Business Media. This book was released on 2013-04-17 with total page 549 pages. Available in PDF, EPUB and Kindle. Book excerpt: New textbooks at all levels of chemistry appear with great regularity. Some fields like basic biochemistry, organic reaction mechanisms, and chemical thermody namics are well represented by many excellent texts, and new or revised editions are published sufficiently often to keep up with progress in research. However, some areas of chemistry, especially many of those taught at the graduate level, suffer from a real lack of up-to-date textbooks. The most serious needs occur in fields that are rapidly changing. Textbooks in these subjects usually have to be written by scientists actually involved in the research which is advancing the field. It is not often easy to persuade such individuals to set time aside to help spread the knowledge they have accumulated. Our goal, in this series, is to pinpoint areas of chemistry where recent progress has outpaced what is covered in any available textbooks, and then seek out and persuade experts in these fields to produce relatively concise but instructive introductions to their fields. These should serve the needs of one semester or one quarter graduate courses in chemistry and biochemistry. In some cases, the availability of texts in active research areas should help stimulate the creation of new courses.

Download or read book Lactoferrin written by T. William Hutchens and published by Springer Science & Business Media. This book was released on 2012-12-06 with total page 295 pages. Available in PDF, EPUB and Kindle. Book excerpt: Lactoferrin is an intriguing protein with an interesting structure and several known or suggested biological activities. We feel that attention on this protein has been too limited and diffuse, partly because it has been "hidden" among other well-known iron-binding proteins such as hemoglobin, ferritin and transferrin, but also perhaps because its biological functions are so diverse. Investigators that focus on lactoferrin represent a wide variety of medical and scientific disciplines that do not usually come together. It was our intention to improve that situation with this symposium. In this book, experts from a variety of disciplines describe the present knowledge of the structural features of lactoferrin, its carbohydrate side chains and its capacity to bind different metal ions and anions. Several of the possible physiological functions of lactoferrin are described in detail, including the role of lactoferrin in bacterial killing, its involvement in growth and proliferation, in immune function and in iron absorption. Aspects of the molecular biology of lactoferrin and its specific interactions with different cell types are also included. Finally, as lactoferrin now has become commercially available in larger quantities, possible industrial applications are discussed. The book should give the interested reader a thorough insight into our present knowledge of lactoferrin.

Download or read book Antibiotics written by Claudio O. Gualerzi and published by John Wiley & Sons. This book was released on 2013-09-05 with total page 549 pages. Available in PDF, EPUB and Kindle. Book excerpt: Most of the antibiotics now in use have been discovered more or less by chance, and their mechanisms of action have only been elucidated after their discovery. To meet the medical need for next-generation antibiotics, a more rational approach to antibiotic development is clearly needed. Opening with a general introduction about antimicrobial drugs, their targets and the problem of antibiotic resistance, this reference systematically covers currently known antibiotic classes, their molecular mechanisms and the targets on which they act. Novel targets such as cell signaling networks, riboswitches and bacterial chaperones are covered here, alongside the latest information on the molecular mechanisms of current blockbuster antibiotics. With its broad overview of current and future antibacterial drug development, this unique reference is essential reading for anyone involved in the development and therapeutic application of novel antibiotics.

Download or read book Vibrational Spectroscopy at Electrified Interfaces written by Andrzej Wieckowski and published by Wiley. This book was released on 2013-09-10 with total page 440 pages. Available in PDF, EPUB and Kindle. Book excerpt: Reviews the latest theory, techniques, and applications Surface vibrational spectroscopy techniques probe the structure and composition of interfaces at the molecular level. Their versatility, coupled with their non-destructive nature, enables in-situ measurements of operating devices and the monitoring of interface-controlled processes under reactive conditions. Vibrational Spectroscopy at Electrified Interfaces explores new and emerging applications of Raman, infrared, and non-linear optical spectroscopy for the study of charged interfaces. The book draws from hundreds of findings reported in the literature over the past decade. It features an internationally respected team of authors and editors, all experts in the field of vibrational spectroscopy at surfaces and interfaces. Content is divided into three parts: Part One, Nonlinear Vibrational Spectroscopy, explores properties of interfacial water, ions, and biomolecules at charged dielectric, metal oxide, and electronically conductive metal catalyst surfaces. In addition to offering plenty of practical examples, the chapters present the latest measurement and instrumental techniques. Part Two, Raman Spectroscopy, sets forth highly sensitive approaches for the detection of biomolecules at solid-liquid interfaces as well as the use of photon depolarization strategies to elucidate molecular orientation at surfaces. Part Three, IRRAS Spectroscopy (including PM-IRRAS), reports on wide-ranging systems—from small fuel molecules at well-defined surfaces to macromolecular complexes—that serve as the building blocks for functional interfaces in devices designed for chemical sensing and electric power generation. The Wiley Series on Electrocatalysis and Electrochemistry is dedicated to reviewing important advances in the field, exploring how these advances affect industry. The series defines what we currently know and can do with our knowledge of electrocatalysis and electrochemistry as well as forecasts where we can expect the field to be in the future.

Download or read book Lipid Domains written by and published by Academic Press. This book was released on 2015-06-08 with total page 393 pages. Available in PDF, EPUB and Kindle. Book excerpt: Current Topics in Membranes is targeted toward scientists and researchers in biochemistry and molecular and cellular biology, providing the necessary membrane research to assist them in discovering the current state of a particular field and in learning where that field is heading. This volume offers an up to date presentation of current knowledge in the field of Lipid Domains. Written by leading experts Contains original material, both textual and illustrative, that should become a very relevant reference material The material is presented in a very comprehensive manner Both researchers in the field and general readers should find relevant and up-to-date information

Download or read book Antimicrobial Peptides and Human Disease written by William Shafer and published by Springer Science & Business Media. This book was released on 2006-10-05 with total page 274 pages. Available in PDF, EPUB and Kindle. Book excerpt: Microbes are in our midst soon after birth. Thankfully, the number of harmless (and often beneficial) microbes far outnumber those that would do us harm. Our ability to ward-off pathogens in our environment, including those that can colonize our exterior and/or interior surfaces, depends on the integrative action of the innate and adaptive immunity systems. This volume of CTMI, entitled Antimicrobial Peptides and Human Disease, is dedicated to the role of antimicrobial peptides (AMPs) in the innate host defense system of homo sapiens.

Download or read book Prokaryotic Antimicrobial Peptides written by Djamel Drider and published by Springer Science & Business Media. This book was released on 2011-03-08 with total page 451 pages. Available in PDF, EPUB and Kindle. Book excerpt: The book will provide an overview of the advancement of fundamental knowledge and applications of antimicrobial peptides in biomedical, agricultural, veterinary, food, and cosmetic products. Antimicrobial peptides stand as potentially great alternatives to current antibiotics, and most research in this newly-created area has been published in journals and other periodicals. It is the editors’ opinion that it is timely to sum up the most important achievements in the field and provide the scientific community in a reference book. The goals of this project include illustrating the achievements made so far, debating the state of the art, and drawing new perspectives.

Download or read book Feldman and Pike s Vitamin D written by Martin Hewison and published by Elsevier. This book was released on 2023-10-28 with total page 1382 pages. Available in PDF, EPUB and Kindle. Book excerpt: Vitamin D deficiency is a worldwide problem linked to numerous diseases affecting men, women, and children of all ages. Enormous progress in the study of vitamin D has been made since the first edition of this highly-acclaimed book was published nearly 20 years ago, and current research continues to draw headlines. Feldman and Pike’s Vitamin D, Fifth Edition continues to build on the successful formula from previous editions, taking the reader from the basic elements of fundamental research to the most sophisticated concepts in therapeutics. The two comprehensive volumes provide investigators, clinicians, and students with a comprehensive, definitive, and up-to-date compendium of the diverse scientific and clinical aspects of vitamin D, where each area is covered by both basic and clinical experts in the field. In Volume I: Biochemistry, Physiology and Diagnostics, international experts in endocrinology, bone biology, and human physiology take readers through the basic research of vitamin D. This impressive reference presents a comprehensive review of the multi-faceted actions of vitamin D relating both to skeletal and extra-skeletal action. Researchers from all areas of vitamin D will gain insight into how clinical observations and practices can feed back into the research cycle and will, therefore, be able to develop more targeted genomic and proteomic insights into the mechanisms of disease. Volume II: Health, Disease and Therapy authoritatively covers the evidence for new roles of vitamin D, ranging from organ transplantation to cancer, diabetes, inflammatory bowel disease, multiple sclerosis, and renal disease. The coverage is appropriately broad, drawing on aspects of internal medicine, pediatrics, nutrition, orthopedics, oncology, neurology, obstetrics and gynecology, and immunology, as well as, new areas for vitamin D including sports medicine, opthalmology, veterinary medicine and ICU care – including COVID-19. Clinical researchers will gain a strong understanding of the molecular basis for a particular disease and better understand future directions for research in this still-growing field. A comprehensive reference ranging from basic biochemistry, cell biology, and physiology principles to the clinical diagnostic and management implications of vitamin D Saves researchers and clinicians time in quickly accessing the very latest details on the diverse scientific and clinical aspects of vitamin D, as opposed to searching through thousands of journal articles Chapters written by the most prominent and well-published names in the field

Download or read book Molecular Medical Microbiology written by Yi-Wei Tang and published by Academic Press. This book was released on 2014-09-14 with total page 2214 pages. Available in PDF, EPUB and Kindle. Book excerpt: The molecular age has brought about dramatic changes in medical microbiology, and great leaps in our understanding of the mechanisms of infectious disease. Molecular Medical Microbiology is the first book to synthesise the many new developments in both molecular and clinical research in a single comprehensive resource. This timely and authoritative three-volume work is an invaluable reference source of medical bacteriology. Comprising more than 100 chapters, organized into 17 major sections, the scope of this impressive work is wide-ranging. Written by experts in the field, chapters include cutting-edge information, and clinical overviews for each major bacterial group, in addition to the latest updates on vaccine development, molecular technology and diagnostic technology. Topics covered include bacterial structure, cell function, and genetics; mechanisms of pathogenesis and prevention; antibacterial agents; and infections ranging from gastrointestinal to urinary tract, centrtal nervous system, respiratory tract, and more. The first comprehensive and accessible reference on molecular medical microbiology Full color presentation througout In-depth discussion of individual pathogenic bacteria in a system-oriented approach Includes a clinical overview for each major bacterial group Presents the latest information on vaccine development, molecular technology, and diagnostic technology More than 100 chapters covering all major groups of bacteria Written by an international panel of authors who are experts in their respective disciplines