Download or read book Structural Analysis of the Reductase Component AnfH of Iron only Nitrogenase from Azotobacter Vinelandii written by Christian Trncik and published by . This book was released on 2022 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: Abstract: Biological nitrogen fixation, the conversion of atmospheric dinitrogen into bioavailable ammonium, is exclusively catalyzed by the enzyme nitrogenase that is present in nitrogen-fixing organisms, the diazotrophs. So far, three different nitrogenase variants, encoded in their corresponding, distinct gene clusters, have been found in nature. Each one of these consists of a catalytic dinitrogenase component and a unique, ATP-dependent reductase, the Fe protein. The three variant nitrogenases differ in the composition of the active site and contain either molybdenum, vanadium or only iron in the dinitrogenase component. Here we present the 2.0 Å resolution crystal structure of the ADP-bound reductase component AnfH of the iron-only nitrogenase from the model diazotroph Azotobacter vinelandii. A comparison of this structure with the ones reported for the two other Fe protein homologs NifH and VnfH in the ADP-bound state shows that all are adopting the same conformation. However, cross-reactivity assays with the three nitrogenase homologs revealed AnfH to be compatible with iron-only nitrogenase and to a lesser degree with the vanadium-containing enzyme, but not with molybdenum nitrogenase
Download or read book Structure function Studies on the Iron Protein from the Azotobacter Vinelandii Nitrogenase Complex written by Robert Paul Hausinger and published by . This book was released on 1982 with total page 358 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Structural and Functional Analysis of Metalloproteins in Azotobacter Vinelandii written by Hanqing Dong and published by . This book was released on 2007 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: The enzyme nitrogenase, which catalyzes nitrogen fixation in Azotobacter vinelandii, consists of two components, the Fe protein (NifH) and the MoFe protein (NifDK). NifK contains several highly conserved residues implicated in its functions throughout the protein. However, the carboxyl terminus of NifK is not implicated in any of the known functions of this protein. Therefore, the present study explored the role of carboxyl terminal region of NifK. The results of growth analysis showed that when the media was adjusted to be slightly acidic, the strain that expresses the mutated NifK yielded a lower growth compared to the wild type. These observations implied that the carboxyl terminus of the NifK contributes to the formation of a stable nitrogenase complex when A. vinelandii is grown in acidic environment. The proper interaction between NifH and NifK is essential for the nitrogenase conformation. To determine how the interaction is influenced by the characteristics of the amino acids available at position 112 of NifH, we introduced residue mutations to the codon encoding for Glu112. Growth analyses indicated that mutant strains are capable of propagation under nitrogen-deficit conditions although the growth rate is lower than that of wild type strain. Therefore the charge carried by the amino acid at position 112 of NifH plays a minor role in the interaction whereas; a more important factor is the length of the side chains. The research on hydrogenase expressed by bacteria shed light on the possibilities of utilizing this novel energy source. We endeavored to take advantage of the nature of A. vinelandii and construct an A. vinelandii mutant strain expressing Fe-hydrogenase. This ongoing research involves molecular manipulation of the enzyme-encoding gene hydA. The synthetic hydA was incorporated and expressed in A. vinelandii strain DJ54. At the same time, we screened several biomass materials for their capabilities in sustaining diazotrophic growth of A. vinelandii. The result indicated that the HydA protein can be expressed in A. vinelandii under certain conditions and a number of biomass substances can be supportive ingredients for putative biohydrogen media.
Download or read book Structure Studies of Iron molybdenum Protein of Nitrogenase from Azotobacter Vinelandii written by Amy Chatterton Robinson and published by . This book was released on 1989 with total page 168 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Structure of the Vanadium Nitrogenase of Azotobacter Vinelandii and Mechanistic Insights Into Biological Nitrogen Fixation written by Daniel Sippel and published by . This book was released on 2017 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Crystallographic Structures and Functional Implications of Nitrogenase Molybdenum iron Proteins from Azotobacter Vinelandii and Clostridium Pasteurianum written by Jongsun Kim and published by . This book was released on 1993 with total page 398 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Agrindex written by and published by . This book was released on 1995 with total page 896 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Cumulated Index Medicus written by and published by . This book was released on 1995 with total page 1500 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Molybdenum Enzymes written by Thomas G. Spiro and published by Wiley-Interscience. This book was released on 1985-11-14 with total page 632 pages. Available in PDF, EPUB and Kindle. Book excerpt: Volume 7 in the Metal Ions in Biology Series, divided into two parts, covers the nitrogenase enzyme complex and the molybdenum redox enzymes. Part one covers the chemistry of Mo-Fe-S clusters and their relationship to nitrogenase, cofactor chemistry and biochemistry of nitrogenase, spectroscopic and electrochemical studies of the Fe-Mo cofactor and Fe-S clusters, and more. Part Two surveys oxo-molybdenum chemistry, discusses the nature of the molybdo-pterin complex, and describes the characteristics of several of the Mo redox enzymes.
Download or read book Fe S Proteins written by Patricia C. dos Santos and published by . This book was released on 2021 with total page 351 pages. Available in PDF, EPUB and Kindle. Book excerpt: This volume explores current technologies used to investigate the formation, insertion, and function of metalloclusters associated with proteins. Chapters describe relevant topics about Fe-S cluster metabolism are explored through genetic, biochemical, spectroscopic methods. Written in the highly successful Methods in Molecular Biology series format, chapters include introductions to their respective topics, lists of the necessary materials and reagents, step-by-step, readily reproducible laboratory protocols, and tips on troubleshooting and avoiding known pitfalls. Authoritative and cutting-edge, Fe-S Proteins: Methods and Protocols aims to be a useful practical guide to researchers to help further their study in this field.
Download or read book Biology of the Nitrogen Cycle written by Hermann Bothe and published by Elsevier. This book was released on 2007 with total page 451 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Climate Resilience and Environmental Sustainability Approaches written by Anubha Kaushik and published by Springer Nature. This book was released on 2021-09-07 with total page 418 pages. Available in PDF, EPUB and Kindle. Book excerpt: The book is about climate resilience and environmental sustainability approaches, discussing knowledge at global level and the local challenges, presented by authors from various countries. Environmental sustainability is at stake and implications of climate change are clearly visible in most parts of the world. In the times of the prevailing global environmental crisis, this book discusses key issues of climate change and sustainable energy alternatives, waste management and development. It discusses climate change scenario using simulation models in various Asian countries, signatures of climate change in Antarctica, implications in the Indian Ocean and the Indian scenario of REDD+. A special focus has been given on building climate resilience in our agricultural ecosystems and sustainable agriculture. It discusses the prospects and challenges of renewable energy options including biofuels and energy from wastewaters, explores the technical aspects of eco-friendly bioremediation of pollutants, sustainable solid waste management practices and challenges, carbon footprints of industry, and emphasizes on the significance of combining traditional knowledge with modern technology with novel approaches including involvement of social enterprises and corporate social responsibility to achieve the Sustainable Development Goals. This is an important document for researchers and policy makers working in multidisciplinary fields of sustainability sciences.
Download or read book Catalysts for Nitrogen Fixation written by Barry E. Smith and published by Springer Science & Business Media. This book was released on 2013-03-20 with total page 351 pages. Available in PDF, EPUB and Kindle. Book excerpt: Biological nitrogen fixation provides more than 50% of the total annual input of the essential element nitrogen to world agriculture. Thus, it is of immense agronomic importance and critical to food supplies, particularly in developing countries. This book, with chapters authored by internationally renowned experts, provides a comprehensive and detailed account of the fascinating history of the process - including the surprising discoveries of molybdenum-independent nitrogenases and superoxide-dependent nitrogenase; a review of Man's attempts to emulate the biological process - most successfully with the commercially dominant Haber-Bosch process; and the current state of the understanding art with respect to the enzymes - called nitrogenases - responsible for biological nitrogen fixation. The initial chapters use a historical approach to the biological and industrial processes, followed by an overview of assay methodologies. The next set of chapters focuses on the classical enzyme, the molybdenum nitrogenase, and details its biosynthesis, structure, composition, and mechanism of action as well as detailing both how variants of its two component proteins are constructed by recombinant DNA technology and how computational techniques are being applied. The sophisticated chemical modelling of the metal-containing clusters in the enzyme is reviewed next, followed by a description of the two molybdenum-independent nitrogenases - first, the vanadium-containing enzyme and then the iron-only nitrogenase - together with some thoughts as to why they exist! Then follows an up-to-date treatment of the clearly "non-classical" properties of the superoxide-dependent nitrogenase, which more closely resembles molybdenum-containing hydroxylases and related enzymes, like nitrate reductase, that it does the other nitrogenases. Each chapter contains an extensive list of references. This book is the self-contained first volume of a comprehensive seven-volume series. No other available work provides the up-to-date and in-depth coverage of this series and this volume. This book is intended to serve as an indispensable reference work for all scientists working in this area, including agriculture and the closely related metals-in-biology area; to assist students to enter this challenging area of research; and to provide science administrators easy access to vital relevant information.
Download or read book Clostridia written by Hubert Bahl and published by John Wiley & Sons. This book was released on 2001-10-15 with total page 300 pages. Available in PDF, EPUB and Kindle. Book excerpt: Clostridia have a high biotechnological potential, although they are generally still regarded more as a group of pathogenic microorganisms. They undertake a broad variety of biocatalytic reactions some of which are unique and of use in the chemical and biotechnology industry for the production of chemicals or for biopharmaceutical purposes. Even some of the clostridial toxins are of medical relevance and can be used as therapeutic agents; The book presents the biology, pyhsiology, and genetics, including genome projects of Clostridia and highlights their potential for industrial and medical applications. It is mostly based on research during the last decade which has brought significant progress in the field and outlines future perspectives of industrial interest.
Download or read book Bioenergetic Processes of Cyanobacteria written by Guenter A. Peschek and published by Springer Science & Business Media. This book was released on 2011-05-26 with total page 733 pages. Available in PDF, EPUB and Kindle. Book excerpt: This publication is unique among a number of books on cyanobacteria because it focuses on the bioenergetics of these widespread organisms which are the evolutionary prerequisite for the development of all higher forms of life on our "blue" planet. The book primarily addresses questions of energy conversion by the fundamental bioenergetic processes: (oxygenic) photosynthesis, (aerobic) respiration, and (anaerobic) fermentation which uniquely occur together in these prokaryotic cells. Thermophilic cyanobacteria offer the most suitable material for high resolution structure analyses of Photosystem I and II and other electron transport complexes by X-ray crystallography (for example, at present the structure of Photosystem II at atomic resolution is only known for these organisms). These achievements during the last decade represent a milestone in our understanding of the complexes which are crucial for solar energy exploitation through photosynthetic water splitting. The present work represents an ambitious attempt to achieve the goal of a synoptic state-of-the-art picture by casting together the mosaics of detailed knowledge described by leading experts in the field. It contains 24 chapters written by 35 authors from Europe, USA, India and Japan. The book is aimed at reaching a broad audience ranging from students to experienced scientists. The editors wish all readers a pleasant and stimulating journey through the fascinating “world” of the bioenergetics of cyanobacteria and sincerely hope that this book will not only be of great value for the experts but also entice young people into this exciting research area with the aim to address successfully the challenging problems of high relevance that are still waiting for a satisfactory answer.
Download or read book Nitrogen Fixation in Agriculture Forestry Ecology and the Environment written by Dietrich Werner and published by Springer Science & Business Media. This book was released on 2005-10-24 with total page 380 pages. Available in PDF, EPUB and Kindle. Book excerpt: Sustainability has a major part to play in the global challenge of continued development of regions, countries, and continents all around the World and biological nitrogen fixation has a key role in this process. This volume begins with chapters specifically addressing crops of major global importance, such as soybeans, rice, and sugar cane. It continues with a second important focus, agroforestry, and describes the use and promise of both legume trees with their rhizobial symbionts and other nitrogen-fixing trees with their actinorhizal colonization. An over-arching theme of all chapters is the interaction of the plants and trees with microbes and this theme allows other aspects of soil microbiology, such as interactions with arbuscular mycorrhizal fungi and the impact of soil-stress factors on biological nitrogen fixation, to be addressed. Furthermore, a link to basic science occurs through the inclusion of chapters describing the biogeochemically important nitrogen cycle and its key relationships among nitrogen fixation, nitrification, and denitrification. The volume then provides an up-to-date view of the production of microbial inocula, especially those for legume crops.
Download or read book Metalloproteins written by Yilin Hu and published by Humana Press. This book was released on 2018-10-31 with total page 275 pages. Available in PDF, EPUB and Kindle. Book excerpt: This volume provides an up-to-date, in-depth overview of the methods that have been applied to studying the complex metalloproteins at a molecular level. Chapters cover a wide range of approaches focusing on genetic, biochemical, spectroscopic, chemical methods, and theoretical calculations. Written in the highly successful Methods in Molecular Biology series format, chapters include introductions to their respective topics, lists of the necessary materials and reagents, step-by-step, readily reproducible laboratory protocols, and tips on troubleshooting and avoiding known pitfalls. Authoritative and cutting-edge, Metalloproteins: Methods and Protocols aims to be useful for anyone who is interested in metalloprotein research and wants to address the unanswered mechanistic and biosynthetic questions of these fascinating enzyme systems.
