Current Topics in Cellular Regulation: Volume 25 is a collection of papers that deals with GTP, the central regulator of cellular anabolism, and the quantitative approach to metabolic control. , Other papers describe the inactivation and aldolases by limited proteolysis by lysosomal cathepsin M, the regulatory functions of proline, pyrroline-5-carboxylic acid, as well as the characteristics of a hormonal regulation of amino acid transport. One paper suggests that GTP, possibly acting through high guanine nucleotide energy charge, acts to stimulate a wide variety of anabolic processes involved in cell growth or proliferation. Another paper proposes that lysosomes are responsible for the degradation of proteins and other macromolecules, and in regulating cytosolic enzymes. This action is due to the presence of selected proteinases (located on the outer lysosomal surface) that are active at neutral pH, and also which catalyze only limited proteolysis of cytosolic proteins. One paper describes the characteristics and hormonal regulation of a specific transport system for neutral amino acids, namely, the System A-mediated transport. The collection can prove beneficial for biochemists, micro-biologists, bio-physicists, cellular researchers, and academicians involved in the study of cellular biology.

Praise for the Series: "Timely...High standard of Writing...It is to be highly recommended." --Quarterly Journal of Experimental Physiology This informative publication brings together knowledge of various aspects of cellular regulation. Current Topics in Cellular Regulation reviews the progress being made in those specialized areas of study that have undergone substantial development. It also publishes provocative new theories and concepts and serves as a forum for the discussion of general principles. Researchers in cellular regulation as well as biochemists, molecular and cell biologists, microbiologists, biophysicists, physiologists, nutritionists, and pathologists will find Current Topics in Cellular Regulation a useful source of up-to-date information. - CONTENTS: - Regulatory Features of Multicatalytic and 26S Proteases - Calponin - Type III Cyclic Nucelotide Phosphodiesterases and Insulin Action - Mammalian Aminoacyl-tRNA Synthetases - Regulation of Interaction between Signaling Protein CheY and Flagellar Motor during Bacterial Chemotaxis - The Chemical Biology of Nitric Oxide: Regulation and Protective and Toxic Mechanisms - Nutritional and Hormonal Regulation of Glutathione Homeostasis - Protein Folding and Association: In Vitro Studies for Self Organization and Targeting in the Cell

Current Topics in Cellular Regulation: Volume 32 is a collection of papers that discusses the role of GTP-binding proteins in signal transduction, the activation of cholera toxin by ADP-ribosylation factors, and the signal transduction by the colony-stimulating factor-1 receptor. Other papers explain the secretory granule, the mechanism of stimulus-secretion coupling, calcium pumps in the plasma and intracellular membranes, as well as the protein phosphorylation in translational control. One paper proposes a linkage between the multimeric structures and cytoskeletal elements to bridge the signal transducing systems and the cytoskeletal network. Another paper describes the signaling mechanisms utilized by CSF-1R, the similarities, and differences when compared to other receptor tyrosine kinases (RTKs). The paper explains in detail the mechanism of ligand-induced kinase activation, and also the possible biological role of certain intracellular substrates. Another paper examines the role played by protein phosphorylation in the control of translation, or when possible, any additional regulatory mechanisms operating in other eukaryotic species. Biochemists, micro-biologists, bio-physicists, cellular researchers, and researchers involved in the study of cellular biology will find the collection very useful.

Current Topics in Cellular Regulation.

First Published in 1985. A collaboration of the latest research on regulation of carbohydrate metabolism.

In this work we present the basic principles of metabolic control which we hope will serve as a foundation for the vast array of factual matter which the biochemist and the physician engaged in metabolic research must accumulate. Accordingly, we attempt to set forth these principles, along with sufficient explanation, so that the reader may apply them to the ever-expanding literature of biochemistry. If we are successful, this will provide a theoretical approach which can be applied to any given set of metabolic reactions. It is impossible to enumerate each and every biochemical reaction and pathway since such a work would be too unwieldy for efficient use. Rather, we hope our presentation of the principles of metabolic control will be sufficiently basic to be of lasting usefulness no matter how detailed biochemistry may become. We would like to be able to con dense biochemistry into a theoretical biology that will not only allow for the general treatment of any given reaction but will enable predic tions to be made as to the existence of necessary pathways and the con sequences of altered control. Such is not possible today, but this may be accomplished in the future. We believe it is now possible to institute the beginnings of such a theoretical biology.

This is the first of a 4-volume module that is an introduction to the study of cell chemistry and physiology. It is not intended to be encyclopedic in nature but rather a general survey of the subject with an emphasis on those topics that are central to an understanding of cell biology and those that are certain to become of increasing importance in the teaching of modern medicine.We have followed what appeared to as to be the logical divisions of the subject beginning with proteins. Allewell and her colleagues stress the point that proteins fold spontaneously to form complex three-dimensional structures and that some of them unfold with the help of proteins called chaperones. Michaelis-Menten kinetics are shown by Nelsestuen to describe the behaviour of enzymes in the test tube. The formalism is particularly useful in the search for agents of therapeutic value, as exemplified by methotrexate. Uptake by mammalian cells of substrates and their metabolic conversions are discussed by van der Vusse and Reneman. However, both Welch and Savageau expound the view that the cell is not simply a bagful of enzymes. The biologist is urged by Savageau to abandon Michaelis-Menten formalism and apply the Power Law. The biologist is also told that the approach to arriving at a theory of metabolic control would have to be one of successive approximations requiring the use of the computer. Information gained from comparative biochemistry is shown by Storey and Brooks to have shed new light on mechanisms of metabolic rate depression and freeze tolerance, and to be applicable to organ transplantation technology. We are reminded that enzyme adaptation is partly the result of the presence of a hydrating shell of vicinal water that stabilises conformation of the enzyme. Vicinal water, according to Drost-Hausen and Singleton, lies adjacent to most solids and protein interfaces. The kinks or breaks observed in the slope of the Arrhenius plot are attributed to structural changes in vicinal water. Regulation of cell volume is shown by Hempling to involve regulation of cell water. It could be that the osmo-receptor or volume detection system is a protein that links the cytoskeleton to specific K and C1 channels. Additionally, it is interesting that aquaporins, which are water channel-forming membrane proteins, are now known to exist in both renal and extra-renal tissues. One of the renal porins is affected by vasopressin. We then pass on to protein synthesis (Rattan) and other important topics including protein glycosylation (Hounsell), methylation (Clarke), ADP-ribosylation (Pearson) and prenylation (Gelb). Among the four types of lipids attached to membrane proteins are the prenyl groups. Ford and Gross in their chapter on lipobiology drive home the point that there is an accumulation of acyl carnitine and lysophospholipids during myocardial infarction.

This book, published in association with the journal MOLECULAR AND CELLULAR BIOCHEMISTRY, is dedicated to Ed Krebs and Eddy Fischer in celebration of their 1992 Nobel Prize in Physiology and Medicine. Reversible protein phosphorylation is a research field pioneered and developed by Krebs and Fischer. This book contains short reviews and original research papers contributed by Krebs and Fischer's coworkers, both former and current. The contents reflect the two-way interaction between protein phosphorylation and other biomedical research fields. The chapters are grouped into four sections. The first two deal with structure/function aspects of protein kinases and protein mechanisms. Unlike many other research fields, which undergo periods of intense activity and productivity followed by relative calm, the protein phosphorylation field enjoyed continued growth both in scope and intensity, and the pace of this growth has increased markedly in recent years. This volume will provide a glimpse of the dynamism and diversity of the research activity representative of the current state of the field.

A keyword listing of serial titles currently received by the National Library of Medicine.