Genetics And Biotechnology Of Lactic Acid Bacteria

A prime reference volume for geneticists, food technologists and biotechnologists in the academic and industrial sectors. Fermentations with lactic acid bacteria determine important qualities such as taste, shelf-life, and food values. New methods of food production require fast and reliable manufacture, which has led to a dramatic surge of interest in the genetic, microbiological and biochemical properties of lactic acid bacteria.

Beginning with an introduction to relevant genetic techniques, chapters cover all major groups of LAB, including the Bifidobacteria; plasmid biology, gene transfer, phage, and sugar metabolism; gene expression of various LAB; applications for genetically engineered LAB, including the emerging field of medical applications; and the legal and consumer issues that arise from such applications. This resource will set the benchmark for the state of knowledge of LAB genetics and should be of value to food scientists and other researchers working with LAB in its present and future capacities. Professionals using lactic acid bacteria (LAB) for research and/or as working organisms, whether in food and dairy fermentations or in the exciting new field of clinical delivery agents, will find this book invaluable. In addition, professors teaching under- and post-graduates in microbiology, and postgraduate research students will also find this an essential reference work.

The economic importance of lactic acid bacteria (LAB) for the food industry and their implication in health and disease has rendered them attractive models for research in many laboratories around the world. Over the past three decades, molecular and genetic analysis of LAB species provided important insights into the biology and application of starter and probiotic LAB and in the virulence of LAB pathogens. The knowledge obtained prepared LAB researchers for the forthcoming opportunities provided by the advent of microbial genomics. Today, developments in next-generation sequencing technologies have rocketed LAB genome research and the sequences of several hundreds of strains are available. This flood of information has revolutionized our view of LAB. First of all, a detailed picture has emerged about the evolutionary mechanisms allowing LAB to inhabit the very diverge ecological niches in which they can be found. Adaptation of LAB to nutrient-rich environments has led to degenerative evolution processes that resulted in shortening of chromosomes and simplified metabolic potential. Gene acquisition through horizontal transfer, on the other hand, is also important in shaping LAB gene pools. Horizontally acquired genes have been shown to be essential in technological properties of starters and in probiosis or virulence of commensals. Progress in bioinformatics tools has allowed rapid annotation of LAB genomes and the direct assignment of genetic traits among species/strains through comparative genomics. In this way, the molecular basis of many important traits of LAB has been elucidated, including aspects of sugar fermentation, flavor and odor formation, production of textural substances, stress responses, colonization of and survival in the host, cell-tocell interactions and pathogenicity. Functional genomics and proteomics have been employed in a number of instances to support in silico predictions. Given that the costs of advanced next-generation methodologies like RNA-seq are dropping fast, bottlenecks in the in silico characterization of LAB genomes will be rapidly overcome. Another crucial advancement in LAB research is the application of systems biology approaches, by which the properties and interactions of components or parts of a biological system are investigated to accurately understand or predict LAB behavior. Practically, systems biology involves the mathematical modeling of complex biological systems that can be refined iteratively with wet-lab experiments. High-throughput experimentation generating huge amounts of data on the properties and quantities of many components such as transcripts, enzymes and metabolites has resulted in several systems models of LAB. Novel techniques allow modelling of additional levels of complexity including the function of small RNAs, structural features of RNA molecules and post-translational modifications. In addition, researchers have started to apply systems approaches in the framework of LAB multispecies ecosystems in which each species or strain is considered as a part of the system. Metatransciptomics, metaproteomics and metametabolomics offer the means to combine cellular behavior with population dynamics in microbial consortia.

For a long time, lactic acid bacteria have played an indispensable role in food production. This book provides an overview and recent findings on their genetics and biochemistry as well as possible applications. The development and use of non-pathogenic lactic acid bacteria in vaccine delivery systems for mucosal immunizations are discussed. Their role in food fermentation, their use in carbohydrate modification and key systems for proteolysis and lantibiotic production are treated in detail. Further, the transformation of organic wastes into food and fertilizers is covered. The volume contains a wealth of useful information and can serve both as an introduction to the field for beginners and as a reference book.

This title represents a broad review of current research on LAB and their novel applications with contributions from a number of well-known leading scientists. The book encompasses a wide range of topics including both traditional and novel developing fields, and provides unparalleled, comprehensive information on new advances of genomics, proteomics, metabolism and biodiversity of LAB. Chapters contain state-of-the-art discussions of specific LAB applications such as their use as probiotics, live vaccines and starter cultures in old and new fermented products. The safety of these microorganisms and their interactions with diverse ecosystems natural biota are also covered as well as the new applications of well-known (bacteriocins) and novel (vitamins, low-calorie sugars, etc.) metabolites produced by LAB. This book is an essential reference for established researchers and scientists, doctoral and post-doctoral students, university professors and instructors, and food technologists working on food microbiology, physiology and biotechnology of lactic acid bacteria.

The September 1996 proceedings summarize current research in the area of lactic acid bacteria in respect to fundamental biology, application, and the potential possibilities for use in promoting human and animal health and nutrition. The 14 papers discuss topics in genetics, metabolism, and applications including the biosynthesis of bacteriocins in lactic acid bacteria, the proteolytic systems of lactic acid bacteria, lactococcus lactis and stress, the barriers to application of genetically modified lactic acid bacteria, the acceleration of cheese ripening, and lactic acid bacteria as vaccine delivery vehicles. Includes illustrations. Annotation copyrighted by Book News, Inc., Portland, OR

Lactic Acid Bacteria in Food Biotechnology: Innovations and Functional Aspects describes the latest advancements in LAB applications in the development of functional foods and fermented foods, biotechnological products using LAB, i.e., bio chemicals (organic acids, bacteriocins, etc.), bioactive and functional biomolecules, comparative genomics of probiotic LAB, and genetically modified LAB in food industry. Bridging the gap between LAB-mediated fermented foods and bioactive compounds, vis-a-vis molecular aspects, this book enables the transition from research to application. The book details applications of LAB in fermented/functional foods including cereals, vegetables, fish, meat cheese, other dairy products, and much more. Other sections cover their biochemistry and biotechnology aspects, bio preservation by bio molecules produced by LAB, bioactive metabolites and biosurfactants, including their value in health and wellness and exploring the genomics of LAB from food to health. Finally, the book addresses genetically modified lactic acid bacteria in food and beverages. Identifies biomolecules released by LAB into foods and their health benefits Describes natural biopreservation by LAB, mechanisms, food safety issues and disease prevention Includes LAB as probiotics, modulation of gut microbiota and health aspects Addresses potentially negative aspects of LAB in producing biogenic amines and health impacts Presents the pros and cons of genetically modified LAB in food industry