Download or read book The Role of the Ribosomal Stalk in the Activity of Ricin Shiga like Toxin 1 and Shiga like Toxin 2 in Saccharomyces Cerevisiae written by Jiachi Chiou and published by . This book was released on 2011 with total page 101 pages. Available in PDF, EPUB and Kindle. Book excerpt: Ricin, Shiga-like toxin 1 (Stx1) and Shiga-like toxin 2 (Stx2) are ribosome inactivating proteins (RIPs) that catalytically remove an adenine residue from the highly conserved [alpha]-sarcin/ricin loop (SRL) in the large ribosomal subunit, inhibiting the translocation step of protein synthesis. Although all RIPs act on the same substrate, they differ in the ribosome specificity among different kingdoms. Ricin is only active towards the eukaryotic ribosomes, while Stx1 and Stx2 are active towards both prokaryotic and eukaryotic ribosomes. Infection with E. coli O157:H7 containing Stx2 is more likely to lead to hemolytic uremic syndrome (HUS) and progress to more severe disease than infection with E. coli O157:H7 containing Stx1. Accumulating evidence indicates that interaction of RIPs with different ribosomal proteins may be responsible for the ribosome specificity. By expressing the enzymatic A subunits of ricin, Stx1 and Stx2 in Saccharomyces cerevisiae, this study presents evidence that the ribosomal stalk is the docking site for ricin, Stx1 and Stx2, but not PAP. The results suggest that the P proteins of the ribosomal stalk recruit the RIPs to the ribosome to build a toxin pool near the SRL, facilitating depurination of the SRL. Stx2 depurinates ribosomes more efficiently than Stx1 regardless of the defects in the ribosomal stalk both in vitro and in vivo. Addition of purified P1[alpha]/P2[beta] proteins has the most impact on the ribosome depurination by Stx1 than Stx2 and RTA. These results suggest that Stx1 is more dependent on the ribosomal stalk than Stx2. A model is proposed to describe the interaction between Stx1A and the ribosomal stalk. The ribosome-bound and the cytoplasmic pool of stalk P proteins play important roles in the depurination of the SRL, ribosome binding and cytotoxicity of the three different toxins. The cytoplasmic pool of P proteins and stalk conformation affect each toxin differently and these differences contribute to their relative cytotoxicity.
Download or read book Ricin and Shiga Toxins written by Nicholas Mantis and published by Springer Science & Business Media. This book was released on 2012-02-10 with total page 283 pages. Available in PDF, EPUB and Kindle. Book excerpt: In May of 2011, Western Europe experienced a severe outbreak of Shiga toxin (Stx)-producing E. coli (STEC) that culminated in more than 3200 cases and 39 deaths. While Stx is not the only virulence factor associated with STEC, it is certainly the primary determinant associated with the onset of hemolytic uremic syndrome (HUS). At the present time, there are no clinically approved measures to neutralize Stx in individuals suffering from STEC infection. Nor are there any preventatives or therapeutics for ricin toxin. Although incidents of ricin exposure are largely unheard of, federal agencies and public health officials consider it a significant threat. It is well documented that domestic and international terrorist groups have stockpiled, and in some cases weaponized ricin with the intent of releasing it into the public sphere and causing panic, illness and/or death on a local, regional, or possibly national scale. The chapters, written by leading experts in the field, are organized so as to cover all aspects of ricin and Stx, including pathogenesis, immunity, vaccines and therapeutics. This outstanding collection of reviews will serve as an important and readily accessible resource for the research community in the coming years.
Download or read book Enterotoxins Microbial Proteins and Host Cell Dysregulation written by Teresa Krakauer and published by MDPI. This book was released on 2018-10-01 with total page 307 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book is a printed edition of the Special Issue "Enterotoxins: Microbial Proteins and Host Cell Dysregulation" that was published in Toxins
Download or read book Ricin Toxins written by Nilgun E. Tumer and published by MDPI. This book was released on 2020-12-14 with total page 154 pages. Available in PDF, EPUB and Kindle. Book excerpt: The plant toxin ricin is one of the most potent and lethal substances known. Due to its wide availability and the ease of production, ricin has been exploited as an agent of bioterrorism and biological warfare and is classified as a level B threat. Tons of ricin are produced annually worldwide as a by-product of castor oil, leading to exposure. Currently, there is no proven safe treatment for ricin intoxication. Ricin consists of an active A subunit (RTA) covalently linked to a cell binding B subunit (RTB). RTA depurinates a universally conserved adenine in the sarcin–ricin loop (SRL) of the large rRNA and inhibits protein synthesis. RTA-antibody complexes have been explored as immunotoxins against cancer cells. The articles published in this book address the history of ricin research, how ricin enters cells and traffics to the ribosome, how it inactivates ribosomes, how it induces inflammatory signaling pathways and programmed cell death, the design of therapies against ricin intoxication, and innovative assays for ricin detection.
Download or read book Ribosome Inactivating Toxins written by Julien Barbier and published by MDPI. This book was released on 2019-01-17 with total page 330 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book is a printed edition of the Special Issue "Ribosome Inactivating Toxins" that was published in Toxins
Download or read book Single Domain Antibodies written by Greg Hussack and published by Springer Nature. This book was released on 2022-02-14 with total page 606 pages. Available in PDF, EPUB and Kindle. Book excerpt: This volume covers current and emerging techniques for studying single-domain antibodies (sdAbs). Chapters guide readers through the biology and immunology of sdAbs in camelids and sharks, isolation of sdAbs, protein engineering approaches to optimize the solubility, stability, valency and antigen binding affinity of sdAbs, and specialized applications of sdAbs. Written in the format of the highly successful Methods in Molecular Biology series, each chapter includes an introduction to the topic, lists necessary materials and reagents, includes tips on troubleshooting and known pitfalls, and step-by-step, readily reproducible protocols. Authoritative and cutting-edge, Single-Domain Antibodies: Methods and Protocols aims to be a useful, practical guide to help researchers further their studies in this field.
Download or read book Toxic Plant Proteins written by J. Michael Lord and published by Springer Science & Business Media. This book was released on 2010-07-20 with total page 275 pages. Available in PDF, EPUB and Kindle. Book excerpt: Many plants produce enzymes collectively known as ribosome-inactivating proteins (RIPs). RIPs catalyze the removal of an adenine residue from a conserved loop in the large ribosomal RNA. The adenine residue removed by this depurination is crucial for the binding of elongation factors. Ribosomes modified in this way are no longer able to carry out protein synthesis. Most RIPs exist as single polypeptides (Type 1 RIPs) which are largely non-toxic to mammalian cells because they are unable to enter them and thus cannot reach their ribosomal substrate. In some instances, however, the RIP forms part of a heterodimer where its partner polypeptide is a lectin (Type 2 RIPs). These heterodimeric RIPs are able to bind to and enter mammalian cells. Their ability to reach and modify ribosomes in target cells means these proteins are some of the most potently cytotoxic poisons found in nature, and are widely assumed to play a protective role as part of the host plant’s defenses. RIPs are able to further damage target cells by inducing apoptosis. In addition, certain plants produce lectins lacking an RIP component but which are also cytotoxic. This book focuses on the structure/function and some potential applications of these toxic plant proteins.
Download or read book Stress Activated Protein Kinases written by Francesc Posas and published by Springer Science & Business Media. This book was released on 2008-01-24 with total page 322 pages. Available in PDF, EPUB and Kindle. Book excerpt: In this book leading researchers in the field discuss the state-of-the-art of many aspects of SAPK signaling in various systems from yeast to mammals. These include various chapters on regulatory mechanisms as well as the contribution of the SAPK signaling pathways to processes such as gene expression, metabolism, cell cycle regulation, immune responses and tumorigenesis. Written by international experts, the book will appeal to cell biologists and biochemists.
Download or read book Wastewater Microbiology written by Gabriel Bitton and published by John Wiley & Sons. This book was released on 2011-06-09 with total page 809 pages. Available in PDF, EPUB and Kindle. Book excerpt: Wastewater Microbiology focuses on microbial contaminants found in wastewater, methods of detection for these contaminants, and methods of cleansing water of microbial contamination. This classic reference has now been updated to focus more exclusively on issues particular to wastewater, with new information on fecal contamination and new molecular methods. The book features new methods to determine cell viability/activity in environmental samples; a new section on bacterial spores as indicators; new information covering disinfection byproducts, UV disinfection, and photoreactivation; and much more. A PowerPoint of figures from the book is available at ftp://ftp.wiley.com/public/sci_tech_med/wastewater_microbiology.
Download or read book RNA Methodologies written by Robert E. Farrell Jr. and published by Elsevier. This book was released on 2010-07-22 with total page 794 pages. Available in PDF, EPUB and Kindle. Book excerpt: This laboratory guide represents a growing collection of tried, tested and optimized laboratory protocols for the isolation and characterization of eukaryotic RNA, with lesser emphasis on the characterization of prokaryotic transcripts. Collectively the chapters work together to embellish the RNA story, each presenting clear take-home lessons, liberally incorporating flow charts, tables and graphs to facilitate learning and assist in the planning and implementation phases of a project. RNA Methodologies, 3rd edition includes approximately 30% new material, including chapters on the more recent technologies of RNA interference including: RNAi; Microarrays; Bioinformatics. It also includes new sections on: new and improved RT-PCR techniques; innovative 5’ and 3’ RACE techniques; subtractive PCR methods; methods for improving cDNA synthesis. * Author is a well-recognized expert in the field of RNA experimentation and founded Exon-Intron, a well-known biotechnology educational workshop center * Includes classic and contemporary techniques * Incorporates flow charts, tables, and graphs to facilitate learning and assist in the planning phases of projects
Download or read book The JNK Signaling Pathway written by Anning Lin and published by CRC Press. This book was released on 2006-02-15 with total page 116 pages. Available in PDF, EPUB and Kindle. Book excerpt: Signal transduction is one of the most exciting research areas in modern biology as it deals with how information flows from the extracellular environment into a living cell to change its metabolism, genotype and phenotype. With the completion of the genomes of human and several other species, it becomes even more important to elucidate the molecular mechanisms that govern cellular functions. The intracellular signaling network, which is composed of many signaling pathways, regulates most, if not all, fundamental cellular activities, from proliferation to programmed cell death (apoptosis). Over the past decade, many signaling pathways have been “mapped’ out. Nowadays, we know in great detail about how a specific signal is transmitted via specific signaling pathways, from the membrane to the nucleus, to change the functions of a cell. In this book, a group of experts present a comprehensive review of one of such signaling pathways, the JNK signaling pathway.
Download or read book Epigenetics in Psychiatry written by Jacob Peedicayil and published by Academic Press. This book was released on 2021-08-21 with total page 848 pages. Available in PDF, EPUB and Kindle. Book excerpt: Epigenetics in Psychiatry, Second Edition covers all major areas of psychiatry in which extensive epigenetic research has been performed, fully encompassing a diverse and maturing field, including drug addiction, bipolar disorder, epidemiology, cognitive disorders, and the uses of putative epigenetic-based psychotropic drugs. Uniquely, each chapter correlates epigenetics with relevant advances across genomics, transcriptomics, and proteomics. The book acts as a catalyst for further research in this growing area of psychiatry. This new edition has been fully revised to address recent advances in epigenetic understanding of psychiatric disorders, evoking data consortia (e.g., CommonMind, ATAC-seq), single cell analysis, and epigenome-wide association studies to empower new research. The book also examines epigenetic effects of the microbiome on psychiatric disorders, and the use of neuroimaging in studying the role of epigenetic mechanisms of gene expression. Ongoing advances in epigenetic therapy are explored in-depth. Fully revised to discuss new areas of research across neuronal stem cells, cognitive disorders, and transgenerational epigenetics in psychiatric disease Relates broad advances in psychiatric epigenetics to a modern understanding of the genome, transcriptome, and proteins Catalyzes knowledge discovery in both basic epigenetic biology and epigenetic targets for drug discovery Provides guidance in research methods and protocols, as well how to employ data from consortia, single cell analysis, and epigenome-wide association studies (EWAS) Features chapter contributions from international leaders in the field
Download or read book Translation Initiation Reconstituted Systems and Biophysical Methods written by and published by Elsevier. This book was released on 2007-10-09 with total page 510 pages. Available in PDF, EPUB and Kindle. Book excerpt: For over fifty years the Methods in Enzymology series has been the critically aclaimed laboratory standard and one of the most respected publications in the field of biochemistry. The highly relevant material makes it an essential publication for researchers in all fields of life and related sciences. This volume, the second of three on the topic of Translation Initiation includes articles written by leaders in the field.
Download or read book Issues in new crops and new uses written by National symposium Creating markets for economic development of new crops in new uses and published by . This book was released on 2007 with total page 350 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book The Neuroscience of Autism Spectrum Disorders written by Joseph D. Buxbaum and published by Academic Press. This book was released on 2012-10-25 with total page 494 pages. Available in PDF, EPUB and Kindle. Book excerpt: Autism is no longer considered a rare disease, and the Center for Disease Control now estimates that upwards of 730,000 children in the US struggle with this isolating brain disorder. New research is leading to greater understanding of and ability to treat the disorder at an earlier age. It is hoped that further genetic and imaging studies will lead to biologically based diagnostic techniques that could help speed detection and allow early, more effective intervention. Edited by two leaders in the field, this volume offers a current survey and synthesis of the most important findings of the neuroscience behind autism of the past 20 years. With chapters authored by experts in each topic, the volume explores etiology, neuropathology, imaging, and pathways/models. Offering a broad background of ASDs with a unique focus on neurobiology, the volume offers more than the others on the market with a strictly clinical focus or a single authored perspective that fails to offer expert, comprehensive coverage. Researchers and graduate students alike with an interest in developmental disorders and autism will benefit, as will autism specialists across psychology and medicine looking to expand their expertise. Uniquely explores ASDs from a neurobiological angle, looking to uncover the molecular/cellular basis rather than to merely catalog the commonly used behavioral interventions Comprehensive coverage synthesizes widely dispersed research, serving as one-stop shopping for neurodevelopmental disorder researchers and autism specialists Edited work with chapters authored by leaders in the field around the globe - the broadest, most expert coverage available
Download or read book Lectins written by Nathan Sharon and published by Springer Science & Business Media. This book was released on 2012-12-06 with total page 134 pages. Available in PDF, EPUB and Kindle. Book excerpt: A characteristic property of most, or perhaps all, proteins is their ability to combine specifically and reversibly with various substances. Well known examples are enzymes that bind substrates and inhibitors, and antibodies that bind antigens. This book deals with lectins, a class of proteins that bind carbohydrates. Another characteristic property of lectins is that they agglutinate cells or precipitate polysaccharides and glycoproteins. This is because lectins are polyvalent, i.e. each lectin molecule has at least two carbohydrate binding sites to allow crosslinking between cells (by combining with sugars on their surfaces) or between sugar containing macromolecules. The agglutinating and precipitating activities of lectins are very similar to those of antibodies. They can likewise be specifically inhibited by low molecular weight compounds (haptens), which in the case of lectins are sugars or sugar containing compounds (Fig. 1.1). Not surprisingly, therefore, many of the methods used in lectin research are based on immunochemical techniques. Nevertheless, lectins are different from antibodies in several important aspects. Many lectins are found in plants, microorganisms and viruses, which do not synthesize immunoglobulins. In fact, they are found in almost all living organisms (Table 1.1) and are not confined to specific organs or tissues. Another marked difference between the two classes of compound is that antibodies are structurally similar, whereas lectins are structurally diverse. In general, lectins are oligomeric proteins composed of subunits, usually with one sugar binding site per subunit.
Download or read book Methods for Analysis of Golgi Complex Function written by and published by Elsevier. This book was released on 2013-11-26 with total page 499 pages. Available in PDF, EPUB and Kindle. Book excerpt: This new volume of Methods in Cell Biology looks at methods for analyzing of golgi complex function. Chapters cover such topics as in vitro reconstitution systems, fluorescence-based analysis of trafficking in mammalian cells and high content screening. With cutting-edge material, this comprehensive collection is intended to guide researchers for years to come. Covers sections on model systems and functional studies, imaging-based approaches and emerging studies Chapters are written by experts in the field Cutting-edge material
