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Peroxiredoxin Systems
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Book Synopsis Peroxiredoxin Systems by : Leopold Flohé
Download or read book Peroxiredoxin Systems written by Leopold Flohé and published by Springer Science & Business Media. This book was released on 2007-09-04 with total page 409 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book contains a broad survey on the peroxiredoxins. It involves almost all groups that contributed significant insights into the emerging field. Coverage discusses the diverse biological roles of the new protein family in the context of other antioxidant systems like those based on heme or selenium catalysis. In addition, the book highlights related future perspectives.
Book Synopsis Peroxiredoxin Systems by : Leopold Flohé
Download or read book Peroxiredoxin Systems written by Leopold Flohé and published by Springer Science & Business Media. This book was released on 2007-09-05 with total page 408 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book contains a broad survey on the peroxiredoxins. It involves almost all groups that contributed significant insights into the emerging field. Coverage discusses the diverse biological roles of the new protein family in the context of other antioxidant systems like those based on heme or selenium catalysis. In addition, the book highlights related future perspectives.
Book Synopsis Peroxiredoxin 6 as a Unique Member of the Peroxiredoxin Family by : Aron B. Fisher
Download or read book Peroxiredoxin 6 as a Unique Member of the Peroxiredoxin Family written by Aron B. Fisher and published by MDPI. This book was released on 2019-05-13 with total page 152 pages. Available in PDF, EPUB and Kindle. Book excerpt: The peroxiredoxin family was discovered approximately 30 years ago and is now recognized as one of the most important families of enzymes related to antioxidant defense and cellular signaling. Peroxiredoxin 6 shares the basic enzymatic functions that characterize this family, but also exhibits several unique and crucial activities. These include the ability to reduce phospholipid hydroperoxides, phospholipase A2 activity, and an acyl transferase activity that is important in phospholipid remodeling. This book describes the available models for investigating the unique functions of PRDX6 and its role in normal physiological function, as well its roles in the pathophysiology of diseases including cancer, diseases of the eye, and male fertility.
Book Synopsis Model Systems for Structural Investigations Into Peroxiredoxin Catalysis, Conformation Change, and Inactivation by : Arden Perkins
Download or read book Model Systems for Structural Investigations Into Peroxiredoxin Catalysis, Conformation Change, and Inactivation written by Arden Perkins and published by . This book was released on 2015 with total page 252 pages. Available in PDF, EPUB and Kindle. Book excerpt: Peroxiredoxin (Prx) enzymes catalyze the reduction of hydrogen peroxide, peroxynitrous acid, and organic peroxides, and are extremely efficient peroxidases, with k[subscript cat]/K[subscript M] on the order of 107 - 108 M−1 s−1. Besides their role in oxidative stress defense, evidence has accumulated that some eukaryotes, including humans, use Prxs as switches to regulate peroxide levels for the purpose of signaling events triggered by hormones and growth factors. Their significance and relevance to human health is underscored by the occurrence of cancer in some Prx knockout mice; the overexpression of Prxs in certain cancers, and knockout/knockdown studies that show Prxs in pathogens can be important, and even essential, for pathogen viability and infectivity. Further, their ubiquity in all the kingdoms of life implies Prxs provide indispensible functions. This thesis reports on work aimed at characterizing aspects of Prx function and catalysis using model systems that behave well for experimentation, specifically focusing on detangling the multifaceted roles of conserved residues, catalytic conformation change, and hyperoxidative inactivation. Five chapters of original work include two review articles and three primary research reports. One review provides a relatively broad overview of Prx structure-function (Chapter 2) and the other focuses on observations related to understanding the physiological role(s) of Prxs especially summarizing the results of knockout/knockdown studies and assessing the natural distribution of an enzyme, sulfiredoxin, that is able to reactivate hyperoxidized Prxs (Chapter 3). The latter shows that many virulent bacterial and eukaryotic pathogens lack sulfiredoxin, implying that they are unable to rescue hyperoxidatively inactivated Prxs. Of the primary research reports, two studies using the model Prx Salmonella typhimurium alkyl hydroperoxide reductase C (StAhpC) assess the impact of modifications on structure and dynamics (Chapter 4) and define the roles of highly conserved residues as they pertain to catalysis, conformation change, and oligomerization (Chapter 5). The studies with StAhpC were enabled by the discovery that a previously studied crystal form of the locally-unfolded (LU) conformation of StAhpC is also able to accommodate the fully-folded (FF) conformation. The work includes presentations of the first crystal structure of the wild type enzyme in its substrate-ready form and also the structures of eight mutants of residues that are well-conserved in the Prx1 subfamily of Prxs. The work led to an awareness of how small shifts in the relative stabilities of the FF versus LU conformations could strongly influence Prx function, and this in turn led to the proposal of a novel idea for the design of selective inhibitors of Prxs as potential drug leads: to target regions involved in the catalytic conformation change to trap them in inactive states. The third primary research report (Chapter 6) presents an analysis of three crystal structures of the PrxQ subfamily that had been solved and deposited in the Protein Data Bank by structural genomics groups, but not described in publications. These three structures provided views of the only remaining undescribed type of Prx conformation change - that of the PrxQ group with a resolving Cys in helix 2. In addition to describing the conformation change, we also define roles for conserved residues from a structural perspective for this entire PrxQ subgroup. Finally, in a forward looking part of the thesis (Chapter 7) I describe initial work toward developing Xanthomonas campestris PrxQ (XcPrxQ) as a new model system for study. This enzyme has the advantage of being a monomer, unusual for Prxs, and this makes it more ideal for probing questions related to dynamics. The preliminary work with this system includes crystal structures solved at 1 Å resolution, the highest for any Prx, trapping all relevant active site oxidation states and a ligand-bound form, NMR backbone assignments for the reduced and oxidized forms, and in silico docking analyses aimed at discovering a conformation-stabilizing inhibitor. Furthermore, results showing that the protein in the crystal has strongly enhanced sensitivity to hyperoxidation validates my proposal that inhibitors stabilizing the FF conformation of Prxs will lead to hyperoxidative inactivation. Together, these results establish XcPrxQ as a promising model system for future study.
Book Synopsis Antioxidants and Antioxidant Enzymes in Higher Plants by : Dharmendra K. Gupta
Download or read book Antioxidants and Antioxidant Enzymes in Higher Plants written by Dharmendra K. Gupta and published by Springer. This book was released on 2018-03-10 with total page 306 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book provides an overview of antioxidants and antioxidant enzymes and their role in the mechanisms of signaling and cellular tolerance under stress in plant systems. Major reactive oxygen species (ROS)-scavenging/modulating enzymes include the superoxide dismutase (SOD) that dismutates O2 into H2O2, which is followed by the coordinated action of a set of enzymes including catalase (CAT), ascorbate peroxidase (APX), glutathione peroxidase (GPX) and peroxiredoxins (Prx) that remove H2O2. In addition to the ROS scavenging enzymes, a number of other enzymes are found in various subcellular compartments, which are involved in maintaining such redox homeostasis either by directly scavenging particular ROS and ROS-byproducts or by replenishing antioxidants. In that respect, these enzymes can be also considered antioxidants. Such enzymes include monodehydroascorbate reductase (MDAR), dehydroascorbate reductase (DHAR), glutathione reductase (GR), alternative oxidases (AOXs), peroxidases (PODs) and glutathione S-transferases (GSTs). Some non-enzymatic antioxidants, such as ascorbic acid (vitamin C), carotenes (provitamin A), tocopherols (vitamin E), and glutathione (GSH), work in concert with antioxidant enzymes to sustain an intracellular steady-state level of ROS that promotes plant growth, development, cell cycles and hormone signaling, and reinforces the responses to abiotic and biotic environmental stressors. Offering a unique compilation of information on antioxidants and antioxidant enzymes, this is a valuable resource for advanced students and researchers working on plant biochemistry, physiology, biotechnology, and signaling in cell organelles, and those specializing in plant enzyme technology.
Book Synopsis Encyclopedia of Signaling Molecules by : Sangdun Choi
Download or read book Encyclopedia of Signaling Molecules written by Sangdun Choi and published by Springer. This book was released on 2017-12-15 with total page 6330 pages. Available in PDF, EPUB and Kindle. Book excerpt: The second edition of this encyclopedia presents over 400 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. 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.
Book Synopsis Modelling and Analysis of Peroxiredoxin Kinetics for Systems Biology Applications by : Beatrice Demelza Eagling
Download or read book Modelling and Analysis of Peroxiredoxin Kinetics for Systems Biology Applications written by Beatrice Demelza Eagling and published by . This book was released on 2015 with total page 184 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Thioredoxin and Glutaredoxin Systems by : Jean-Pierre Jacquot
Download or read book Thioredoxin and Glutaredoxin Systems written by Jean-Pierre Jacquot and published by MDPI. This book was released on 2019-05-10 with total page 280 pages. Available in PDF, EPUB and Kindle. Book excerpt: This Special Issue features recent data concerning thioredoxins and glutaredoxins from various biological systems, including bacteria, mammals, and plants. Four of the sixteen articles are review papers that deal with the regulation of development of the effect of hydrogen peroxide and the interactions between oxidants and reductants, the description of methionine sulfoxide reductases, detoxification enzymes that require thioredoxin or glutaredoxin, and the response of plants to cold stress, respectively. This is followed by eleven research articles that focus on a reductant of thioredoxin in bacteria, a thioredoxin reductase, and a variety of plant and bacterial thioredoxins, including the m, f, o, and h isoforms and their targets. Various parameters are studied, including genetic, structural, and physiological properties of these systems. The redox regulation of monodehydroascorbate reductase, aminolevulinic acid dehydratase, and cytosolic isocitrate dehydrogenase could have very important consequences in plant metabolism. Also, the properties of the mitochondrial o-type thioredoxins and their unexpected capacity to bind iron–sulfur center (ISC) structures open new developments concerning the redox mitochondrial function and possibly ISC assembly in mitochondria. The final paper discusses interesting biotechnological applications of thioredoxin for breadmaking.
Book Synopsis Thiol Redox Transitions in Cell Signaling, Part B by :
Download or read book Thiol Redox Transitions in Cell Signaling, Part B written by and published by Academic Press. This book was released on 2010-08-19 with total page 389 pages. Available in PDF, EPUB and Kindle. Book excerpt: This volume, along with its companion (volume 474), presents methods and protocols dealing with thiol oxidation-reduction reactions and their implications as they relate to cell signaling. The critically acclaimed laboratory standard for 40 years, Methods in Enzymology is one of the most highly respected publications in the field of biochemistry. Since 1955, each volume has been eagerly awaited, frequently consulted, and praised by researchers and reviewers alike. Over 450 volumes have been published to date, and much of the material is relevant even today--truly an essential publication for researchers in all fields of life sciences. Along with companion volume, provides a full overview of techniques necessary to the study of thiol redox in relation to cell signaling Gathers tried and tested techniques from global labs, offering both new and tried-and-true methods Relevant background and reference information given for procedures can be used as a guide to developing protocols in a number of disciplines
Book Synopsis Advances in Cyanobacterial Biology by : Prashant Kumar Singh
Download or read book Advances in Cyanobacterial Biology written by Prashant Kumar Singh and published by Academic Press. This book was released on 2020-03-04 with total page 420 pages. Available in PDF, EPUB and Kindle. Book excerpt: Advances in Cyanobacterial Biology presents the novel, practical, and theoretical aspects of cyanobacteria, providing a better understanding of basic and advanced biotechnological application in the field of sustainable agriculture. Chapters have been designed to deal with the different aspects of cyanobacteria including their role in the evolution of life, cyanobacterial diversity and classification, isolation, and characterization of cyanobacteria through biochemical and molecular approaches, phylogeny and biogeography of cyanobacteria, symbiosis, Cyanobacterial photosynthesis, morphological and physiological adaptation to abiotic stresses, stress-tolerant cyanobacterium, biological nitrogen fixation. Other topics include circadian rhythms, genetics and molecular biology of abiotic stress responses, application of cyanobacteria and cyanobacterial mats in wastewater treatments, use as a source of novel stress-responsive genes for development of stress tolerance and as a source of biofuels, industrial application, as biofertilizer, cyanobacterial blooms, use in Nano-technology and nanomedicines as well as potential applications. This book will be important for academics and researchers working in cyanobacteria, cyanobacterial environmental biology, cyanobacterial agriculture and cyanobacterial molecular biologists. Summarizes the various aspects of cyanobacterial research, from primary nitrogen fixation, to advanced nano-technology applications Addresses both practical and theoretical aspects of the cyanobacterial application Includes coverage of biochemical and molecular approaches for the identification, use and management of cyanobacteria
Book Synopsis Measuring Oxidants and Oxidative Stress in Biological Systems by : Lawrence J. Berliner
Download or read book Measuring Oxidants and Oxidative Stress in Biological Systems written by Lawrence J. Berliner and published by Springer Nature. This book was released on 2020-08-08 with total page 237 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book describes the methods of analysis and determination of oxidants and oxidative stress in biological systems. Reviews and protocols on select methods of analysis of ROS, RNS, oxygen, redox status, and oxidative stress in biological systems are described in detail. It is an essential resource for both novices and experts in the field of oxidant and oxidative stress biology.
Book Synopsis Investigation Into Peroxiredoxin and Interactions in the Peroxiredoxin Peroxide Scavenging System by : Paul Brian Charles James
Download or read book Investigation Into Peroxiredoxin and Interactions in the Peroxiredoxin Peroxide Scavenging System written by Paul Brian Charles James and published by . This book was released on 2010 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Peroxiredoxins are a family of multifunctional enzymes that are able to protect the cell against oxidative stress. Peroxiredoxins form part of a recently discovered peroxide scavenging system along with thioredoxin, thioredoxin reductase and sulfiredoxin. This study describes the purification of a recombinant human peroxiredoxin II from human erythrocytes. The original recombinant clone contained a point mutation at the fourth residue from glycine to valine and a number of problems were encountered with aggregation during purification. Reverting back to the original amino acid sequence allowed the protein to be purified and concentrated without aggregation, as well as leading to over-expression in the same oligomeric state as the native sample from blood. This study also describes the over-expression and purification of the human peroxiredoxin II protein in the intermolecular disulfide form as well as the subsequent crystallisation and X-ray diffraction studies. The crystal structure for this form of the protein was obtained to 3.3 Å resolution revealing the peroxiredoxin to be in the decameric form. In addition conformational changes in the protein that are necessary for formation of the intermolecular disulfide between the peroxidatic (Cys52) and resolving cysteine (Cys172) have been observed. The structure also revealed that these movements did not interfere with the dimer:dimer interface as had been previously suggested. This then allows the disulfide to be seen within the decameric form of peroxiredoxin. The production of covalent complexes formed between peroxiredoxin and sulfiredoxin, and peroxiredoxin and thioredoxin was also investigated. Complexes were stabilised by using DTNB to form a covalent bond between specific cysteine residues. The complex binding results from size exclusion chromatography showed that decameric peroxiredoxin bound to sulfiredoxin in a 1:5 ratio and decameric peroxiredoxin bound to thioredoxin in a 1:10 ratio. Cloning, over-expression and purification of the selenocysteine containing enzyme thioredoxin reductase was achieved. A minimal selenocysteine insertion sequence was added to the 3' end of the DNA sequence to drive selenocysteine insertion in place of the typical stop UGA codon. The activity of this protein was found to be low but was greatly increased when co-expressed with a plasmid containing the selA, selB and selC genes. Although the activity of this co-expressed thioredoxin reductase was ~20% of the native enzyme activity, it was comparable to the activity of other recombinant forms of the enzyme. These studies report the purification of all of the proteins necessary to reform the peroxiredoxin system and allow the production of a working assay for peroxiredoxin activity. Together with the first report for a structure of a decameric disulfide form of human peroxiredoxin II a greater insight into the peroxiredoxin system has been obtained.
Book Synopsis Hydrogen Peroxide and Cell Signaling, Part B by :
Download or read book Hydrogen Peroxide and Cell Signaling, Part B written by and published by Academic Press. This book was released on 2013-07-15 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: This new volume of Methods in Enzymology continues the legacy of this premier serial with quality chapters authored by leaders in the field. This is the second of three volumes on hydrogen peroxide and cell signaling, and includes chapters on such topics as the cellular steady-state of H2O2, evaluating peroxiredoxin sensitivity towards inactivation by peroxide substrates, and peroxiredoxins as preferential targets in H2O2-induced signaling.
Book Synopsis Protein Sensors and Reactive Oxygen Species by : Helmut Sies
Download or read book Protein Sensors and Reactive Oxygen Species written by Helmut Sies and published by Academic Press. This book was released on 2002 with total page 550 pages. Available in PDF, EPUB and Kindle. Book excerpt: This volume of Methods in Enzymology is concerned with the rapidly developing field of selenoprotein synthesis and its related molecular genetics. Progressive information on the topics of proteins as redox sensors, selenoproteins, and the thioredoxin system is studied using methods such as bioinformatics, DNA chip technology, cell biology, molecular genetics, and enzymology. The information on novel selenoproteins identified from genomic sequence data, as well as current knowledge on glutathione peroxidases, selenoprotein P, iodothyronine deiodinases, and thioredoxin reductases, is presented in a method-based approach.
Book Synopsis Thyroid Hormone Metabolism by : Georg Hennemann
Download or read book Thyroid Hormone Metabolism written by Georg Hennemann and published by Marcel Dekker. This book was released on 1986 with total page 656 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Glutathione System and Oxidative Stress in Health and Disease by :
Download or read book Glutathione System and Oxidative Stress in Health and Disease written by and published by BoD – Books on Demand. This book was released on 2020-08-26 with total page 140 pages. Available in PDF, EPUB and Kindle. Book excerpt: The imbalance between the production of reactive oxygen species (ROS) and antioxidant defenses determines a state known as oxidative stress. Higher levels of pro-oxidants compared to antioxidant defenses may generate oxidative damage, which, in turn, may lead to modifications in cellular proteins, lipids, and DNA, reducing functional capacity and increasing the risk of diseases. Nevertheless, the clearance of harmful reactive chemical species is achieved by the antioxidant defense systems. These protection systems are referred to as the first and second lines of defense and comprise the classic antioxidants, enzymatic and nonenzymatic defenses, including glutathione. This book presents and discusses the advancement of research on health and diseases and their underlying mechanisms, exploring mainly aspects related to the glutathione antioxidant system.
Book Synopsis Transition States of Biochemical Processes by : R. Gandour
Download or read book Transition States of Biochemical Processes written by R. Gandour and published by Springer Science & Business Media. This book was released on 2013-06-29 with total page 625 pages. Available in PDF, EPUB and Kindle. Book excerpt: The transItIOn-state theory has been, from the point of its inception, the most influential principle in the development of our knowledge of reaction mechanisms in solution. It is natural that as the field of biochemical dynamics has achieved new levels of refinement its students have increasingly adopted the concepts and methods of transition-state theory. Indeed, every dynamical problem of biochemistry finds its most elegant and economical statement in the terms of this theory. Enzyme catalytic power, for example, derives from the interaction of enzyme and substrate structures in the transition state, so that an understanding of this power must grow from a knowledge of these structures and interactions. Similarly, transition-state interactions, and the way in which they change as protein structure is altered, constitute the pivotal feature upon which molecular evolution must turn. The complete, coupled dynamical system of the organism, incorporating the transport of matter and energy as well as local chemical processes, will eventually have to yield to a description of its component transition-state structures and their energetic response characteristics, even if the form of the description goes beyond present-day transition-state theory. Finally, the importance of biochemical effectors in medicine and agriculture carries the subject into the world of practical affairs, in the use of transition-state information for the construction of ultra potent biological agents.
