Bacterial Cellular Metabolic Systems

The metabolic regulation of a cell system is of critical importance in systems biology, and a robust model of these mechanisms is essential in predicting the effects on the metabolism of both the culture environment and the knockout of specific genes. Bacterial cellular metabolic systems focuses on this highly topical subject in relation to culture environment and provides a detailed analysis from gene level to metabolic level regulation, as well as offering a discussion of the most recent modelling approaches. The book begins with an introduction to metabolic mechanisms and to the metabolic regulation of a cell, before moving on to discussing the action of global regulators in response to a specific culture environment. The second half of the book examines conventional flux balance analysis and its applications, 13C-metabolic flux analysis, and the effect of a specific gene knockout on the metabolism. Comprehensive account of metabolic regulation via global regulators in response to changes in the culture environment Basic formulation of 13C-metabolic flux analysis based on 13C-labelling experiments Systems biology approach for the modelling and computer simulation of the main metabolic pathways of a cell system

I am particularly indebted to Joan Macy, Lynne Quandt, Jan Andreesen and Peter Hillmer for reading the manuscript, for their criticisms and their suggestions, and I thank Ute Gnass for typing the manuscript and for her invaluable help with the indexing and with the preparation of the figures. Finally, I am grateful to the publishers for their patience, willing help, and cooperation. G6ttingen, 1978 GERHARD GOTTSCHALK Contents CHAPTER I Nutrition of Bacteria I. Major and Minor Bioelements I II. The Two Basic Mechanisms of ATP Synthesis 4 III. Nutrients as Energy Sources 6 IV. Growth Factor Requirements of Bacteria 9 V. Summary 10 CHAPTER 2 How Escherichia coli Synthesizes ATP during Aerobic Growth on Glucose I. Transport of D-Glucose into the E. coli Cell 13 II. Degradation of Glucose-6-Phosphate to Pyruvate via the Embden-Meyerhof- Parnas (EMP) Pathway 15 III. Oxidative Decarboxylation of Pyruvate to Acetyl-Coenzyme A 18 IV. Oxidation of Acetyl-CoA via the Tricarboxylic Acid Cycle 20 V. The Formation of ATP in the Respiratory Chain 22 VI. Summary 35 CHAPTER 3 Biosynthesis of Escherichia coli Cells from Glucose I. Composition of E. coli Cells 38 II. Assimilation of Ammonia 40 Ill. Assimilatory Reduction of Sulfate 42 IV. Biosynthesis of Amino Acids 43 V. How Pentose Phosphates and NADPH are Formed 55 xii Contents VI. Ribonucleotides and Deoxyribonucleotides 59 VII. Biosynthesis of Lipids 65 VIII. Formation of Carbohydrates 71 IX. Synthesis of Polymers 73 X. The Requirement for an Anaplerotic Sequence 92 XI.

This book provides useful information on microbial physiology and metabolism. The key aspects covered are prokaryotic diversity, growth physiology, basic metabolic pathways and their regulation, metabolic diversity with details of various unique pathways. Another focus area is stress physiology with details on varying environmental stresses, signal transduction, adaptation and survival. For instructional purposes, the book provides case studies, interesting facts, techniques etc. which help in showcasing the inter-disciplinary nature and bridge the gap between various aspects of applied microbiology.

Bacterial Metabolism focuses on metabolic events that occur in microorganisms, as well as photosynthesis, oxidation, polysaccharide formation, and homofermentation. The book first discusses the thermodynamics of biological reactions, photosynthesis and photometabolism, and chemosynthesis. Free energy, photosynthesis, enzymes, and terminology in bacterial metabolism are elaborated. The manuscript then examines acetic acid bacteria and lactic acid bacteria. Discussions focus on lactate, ethanol, glucose, and glycerol metabolism, glycol oxidation, homofermentation, polysaccharide formation, and electron transport systems. The publication takes a look at pseudomonadaceae and nitrogen metabolism as an energy source for anaerobic microorganisms. Topics include metabolism of pairs of amino acids, single amino acid metabolism, oxidation of glycolate and malonate, and oxygenases. The book is a dependable source of information for readers interested in bacterial metabolism.

This book has been written for students who are taking a course in bacterial metabolism. I hope, however, that scholars will also find it useful either as a help in teaching bacterial metabolism or as a review on the special aspects of metabolism in bacteria. The concept of this book results from my experience in teaching bacterial metabolism. In the first chapters the principal reactions of the energy and biosynthetic metabolism have been discussed using Escherichia coli as a model organism. Then the diversity of aerobic metabolism has been out lined. Following a brief description of the regulation of the level and the activity of enzymes in bacteria the characteristic features of fermentative, chemolithotrophic and phototrophic metabolism have been discussed. Finally, the last chapter has been devoted to nitrogen fixation. Throughout the text I have tried not only to describe metabolic pathways and enzyme reactions but also to elucidate the physiology of the microorganisms which carry out all these metabolic reactions. Two comments regarding the formulas used in this book are necessary.

Groundbreaking thinking on how bacterial metabolism is foundational to pathogenesis For too long, bacterial metabolism and bacterial pathogenesis have been studied as separate entities. However, the scientific community is beginning to realize that not only are bacterial nutrient acquisition and utilization essential for pathogenesis, but that interfering with the pathogen-specific metabolic pathways used during infection can regulate virulence factor expression and might lead to effective breakthroughs in a variety of treatments. Editors Paul Cohen and Tyrrell Conway, who pioneered the use of metabolic mutants in competitive colonization assays, an approach now widely used to investigate the nutrition of pathogens in vivo, are uniquely qualified to advance our knowledge of this integrative field of research. They convened a group of contributors who are breaking new ground in understanding how bacterial metabolism is foundational to pathogenesis to share their expert perspectives and outlook for the future. Beginning with overviews, Metabolism and Bacterial Pathogenesis covers a wide range of diseases and both Gram-positive and -negative bacteria that serve as model systems for in vitro and in vivo investigations intracellular, respiratory, and enteric pathogens pathogen-specific nutrient acquisition in hosts mechanisms of host-driven metabolic adaptation by pathogens metabolic regulation of virulence gene expression Useful for specialists in bacterial pathogenesis and specialists in metabolism as well as molecular biologists, physicians, veterinarians, dentists, graduate and undergraduate students, and laboratory technicians, Metabolism and Bacterial Pathogenesis is also essential reading for scientists studying the microbiome.

Metabolism refers to all the biochemical reactions that take place in a cell or organism. The study of bacterial metabolism focuses on the chemical diversity of substrate oxidations and dissimilation reactions, which normally function in bacteria to generate energy. The role of metabolism in the bacterial response to antibiotics has recently garnered interest because of a rapid rise in antibiotic resistance, a clear link between metabolic function and cell viability, and the lack of novel targets for hard-to-treat infections. Also within the scope of bacterial metabolism is the study of the uptake and utilization of the inorganic or organic compounds required for growth and maintenance of a cellular steady state (assimilation reactions). Genome-scale metabolic models bridge the gap between genome-derived biochemical information and metabolic phenotypes in a principled manner, providing a solid interpretative framework for experimental data related to metabolic states, and enabling simple in silico experiments with whole-cell metabolism.This book entitled "Bacterial Metabolism" presents cutting-edge research and reviews on how bacterial and archaeal structure lead to function, how metabolic processes are regulated, how microbes respond to environmental stressors, and how microbes can be manipulated to enhance their growth or the production of desired products. It also summarises the current knowledge of the bacterial isolates capable of anaerobic mineralization of hydrocarbons, and of the biochemistry and molecular biology of enzymes involved in the catabolic pathways of some of these substrates. Several alkylbenzenes, alkanes or alkenes are anaerobically utilized as substrates by several species of denitrifying, ferric iron-reducing and sulfate-reducing bacteria. The book will be of valued for students, researchers as well as for practitioners dealing with the subject.