P. Boon Chock – författare

Recent developments in concepts and techniques have brought enzyme research to a changing yet exciting stage. Enzymes have served as indispensable tools in the phenomenal rise of molecular biology, and the resultant biotechnology thrusts enzymes to new heights and territories. This volume, the proceedings of a recent symposium on the Dynamics of Soluble and Immobilized Enzyme Systems, provides a current overview of the field to help scientists utilize long-established and newly acquired information.

Recent developments in concepts and techniques have brought enzyme research to a changing yet exciting stage. Enzymes have served as indispensable tools in the phenomenal rise of molecular biology, and the resultant biotechnology thrusts enzymes to new heights and territories. This volume, the proceedings of a recent symposium on the Dynamics of Soluble and Immobilized Enzyme Systems, provides a current overview of the field to help scientists utilize long-established and newly acquired information.

Current Topics in Cellular Regulation: Volume 27, Modulation by Covalent Modification is a compendium of papers dealing with the coordination, function, or control of cellular metabolism, particularly on modulation by covalent modification. One paper reviews the cyclic cascade model in metabolic regulation that shows the model''s applicability to all covalent interconvertible enzyme systems, such as those modified by phosphorylation, ADP-ribosylation, carboxymethylation, acetylation, and sulfation. Another paper discusses the hypothesis that smooth muscle contraction is regulated by a calcium-dependent phosphorylation of the myosin molecule. Studies made by Sellers and Pato suggest that a phosphatase isolated from turkey gizzard muscle (known as smooth muscle phosphatase IV) can be related to an in vivo myosin phosphatase as the phosphatase IV binds well to both myosin and thiophosphorylated myosin. Other papers describe in situ regulation studies of Excherichia coli glutamine synthethase, the posttranslational processing of the insulin proreceptor, and selenium in cellular metabolism. The compendium is suitable for biochemists, microbiologists, and academicians whose works involve research in cell biology.

Current Topics in Cellular Regulation: Volume 30 is a collection of papers that deals with eukaryotic DNA methylation, gene expression, regulation of nitrogenase activity, and the recognition of DNA by Type II restriction enzymes. Other papers discuss the mitochondrial Krebs cycle, enzyme mechanisms, transducin, and calcium-dependent cellular processes. One paper explains that methylation and demethylation of the DNA are complicated active processes, involving many aspects of the genome. The paper also notes that within the gross changes in methylation patterns, specific CpG sites play important roles in the expression or shutdown of target genes. Another paper concludes that, mono-ADP ribosylation being a mechanism of action of the diphtheria toxin, ADP ribosylation plays a role in normal cell metabolism by regulating the activity of key enzymes. One paper explains the significance of restriction enzymes into the nature of DNA-protein interactions; as well as the enzyme''s possible role in discriminating between alternative DNA sequences. Biochemists, cellular researchers, micro-biologists, bio-physicists, and academicians involved in the study of cellular biology will find the collection very useful.

Current Topics in Cellular Regulation: Volume 31 is a collection of papers that deals with the role of calcium as intracellular messenger, calcium release or entry across the plasma membrane, calcium in neurotransmitter release, and the regulation of free calmodulin levels in neurons by neuromodulin. Other papers discuss the calcium/calmodulin-dependent protein kinase II, the regulation of muscular calcium channels, and the Na+-Ca2+ exchangers. One paper describes the mechanisms of intracellular calcium release or entry in which agonists acting through the phosphoinositide system, or possibly by metabolites or secondary messenger system,can regulate the mechanisms of cellular Ca2+. Another paper describes different approaches in evaluating the possible mechanisms of calcium in neurotransmitter release. The paper notes that imaging techniques can be used in the timing and order of events in the release process. Possible identification by the investigator of specific "releasing" regions at the membranes, such as active zones, can also define more precisely the exact localization of the process. One paper discusses the interaction between released calmodulin and cytoskeleton proteins that can affect polymerization and cross-linking of cytoskeleton polymers, that leads to filopodia formation or extension. The collection will prove beneficial to molecular biologists, general biologists, microbiologists, biochemists, and researchers involved in cellular biology.

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.