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Gram-negative Escherichia coli (E. coli) bacteria are the most numerous commensal aerobic germs located in the human colon. Diarrhea caused by E. coli pathogenic strains is a major cause of death in developing countries, especially the sub-Saharan and South Asian areas. Some strains cause diarrhea, and all of them may produce an infectious disease. This book includes ten chapters covering the main aspects of infections related to E. coli, their pathogenic mechanisms, treatments, and resistance to diverse antibiotics.
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Escherichia coli --- Escherichia coli --- Escherichia coli infections --- Colibacillose --- Escherichia coli --- Escherichia coli --- Congresses --- Congresses --- Congresses --- Congrès --- Congrès --- Congrès
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The title of the book ""The Universe of Escherichia coli"" aims to present and emphasize the huge diversity of this bacterial species and our efforts to prevent the E. coli infections. As it is part of the gut microbiota, E. coli is a well-known commensal species, and probiotic E. coli strains are successfully used for improving host's health. Also many ""workhorse"" E. coli strain exist that are employed in laboratory and biotechnology settings. But certain E. coli strains can cause intestinal and also extraintestinal infections at many anatomical sites. Therefore many efforts are undertaken to prevent E. coli infections, among them food safety, vaccines, but also new antimicrobial agents are searched for.
Escherichia coli. --- E. coli (Bacterium) --- Escherichia --- Life Sciences --- Microbiology --- Genetics and Molecular Biology --- Biochemistry --- Bacteriology
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Shiga toxin-producing Escherichia coli (STEC) is an important foodborne pathogen associated with both outbreaks and sporadic cases of human disease, ranging from uncomplicated diarrhoea to haemorrhagic colitis (HC) and haemolytic uraemic syndrome (HUS). STEC affects children, elderly and immuno-compromised patients. STEC is capable of producing Shiga toxin type 1 (Stx1), type 2 (Stx2) or both, encoded by stx1 and stx2 genes, respectively. These strains are likely to produce putative accessory virulence factors such as intimin (encoded by eae), an enterohaemolysin (EhxA) and an autoagglutinating protein commonly associated with eae-negative strains (Saa), both encoded by an enterohaemorrhagic plasmid. Several studies have confirmed that cattle are the principal reservoir of STEC (O157 and non-O157:H7 serotypes) and many of these serotypes have been involved in HUS and HC outbreaks in other countries. Transmission of STEC to humans occurs through the consumption of undercooked meat, vegetables and water contaminated by faeces of carriers and by person-to-person contact. Diagnostic methods have evolved to avoid selective diagnostics, currently using molecular techniques for typing and subtyping of strains. Control is still a challenge, although there are animal vaccines directed against the serotype O157:H7.
Escherichia coli. --- E. coli (Bacterium) --- Escherichia --- environment --- Cattle --- STEC --- Virulence Factors --- Food
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Bacterial genetics --- Escherichia coli --- Lactose --- Operons --- Génétique bactérienne --- Escherichia coli --- Opérons
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Bacteria --- DNA, Bacterial --- Bacterial genetics --- Escherichia coli --- Génétique bactérienne --- genetics --- Genetics --- Génétique --- Génétique bactérienne --- Génétique --- DNA, Bacterial. --- genetics. --- Escherichia coli - Genetics --- Bacteria - genetics --- Escherichia coli - genetics --- Genes, bacterial
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Escherichia coli --- Virulence (Microbiology) --- Colibacillose --- Virulence (Microbiologie) --- Congresses. --- Congrès --- Congrès
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With the advent of recombinant DNA technology, expressing heterologous proteins in microorganisms rapidly became the method of choice for their production at laboratory and industrial scale. Bacteria, yeasts and other hosts can be grown to high biomass levels efficiently and inexpensively. Obtaining high yields of recombinant proteins from this material was only feasible thanks to constant research on microbial genetics and physiology that led to novel strains, plasmids and cultivation strategies. Despite the spectacular expansion of the field, there is still much room for progress. Improving the levels of expression and the solubility of a recombinant protein can be quite challenging. Accumulation of the product in the cell can lead to stress responses which affect cell growth. Buildup of insoluble and biologically inactive aggregates (inclusion bodies) lowers the yield of production. This is particularly true for obtaining membrane proteins or high-molecular weight and multi-domain proteins. Also, obtaining eukaryotic proteins in a prokaryotic background (for example, plant or animal proteins in bacteria) results in a product that lack post-translational modifications, often required for functionality. Changing to a eukaryotic host (yeasts or filamentous fungi) may not be a proper solution since the pattern of sugar modifications is different than in higher eukaryotes. Still, many advances in the last couple of decades have provided to researchers a wide variety of strategies to maximize the production of their recombinant protein of choice. Everything starts with the careful selection of the host. Be it bacteria or yeast, a broad list of strains is available for overcoming codon use bias, incorrect disulfide bond formation, protein toxicity and lack of post-translational modifications. Also, a huge catalog of plasmids allows choosing for different fusion partners for improving solubility, protein secretion, chaperone co-expression, antibiotic resistance and promoter strength. Next, controlling culture conditions like temperature, inducer and media composition can bolster recombinant protein production. With this Research Topic, we aim to provide an encyclopedic account of the existing approaches to the expression of recombinant proteins in microorganisms, highlight recent discoveries and analyze the future prospects of this exciting and ever-growing field.
Environmental sciences. --- Inclusion Bodies --- Escherichia coli --- Filamentous fungi --- Microalgae --- Recombinant Proteins --- Microorganism --- fusion tags --- yeast
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Escherichia coli is a facultative anaerobic Gamma-proteobacterium, which belongs to the family Enterobacteriaceae. While being an important constituent of the normal gut microbiota, specialized E. coli clones have acquired genetic elements that allow them to compete with the endogenous commensals, colonise normally sterile niches and cause disease. E. coli pathotypes can cause intestinal and extra intestinal infections (e.g. UTI, sepsis) and associate with mammalian cells while being extra- or intra-cellular. In recent years, E. coli infections have become a serious clinical problem, due to the rapid spread of antibiotic resistance. Thus, infections with intestinal E. coli (e.g. E. coli O104) or extraintestinal pathogenic strains (e.g. E. coli ST131) are becoming difficult to treat and are often lethal. Consequently, there is a pressing need to develop alternative control measures, including the identification of new drug targets and development of vaccines that offer lasting protection. This volume focuses on several types of E. coli infections (intestinal and extraintestinal), virulence factors, and E. coli pandemics. It addresses the problem of antibiotic resistance, and a dedicated chapter discusses the need to develop alternative control measures. Given its depth and breadth of coverage, the book will benefit all those interested in the biology, genetics, physiology and pathogenesis of E. coli, and in related vaccine development.
Escherichia coli. --- E. coli (Bacterium) --- Escherichia --- Microbiology. --- Emerging infectious diseases. --- Bacteriology. --- Medical Microbiology. --- Infectious Diseases. --- Microbiology --- Emerging infections --- New infectious diseases --- Re-emerging infectious diseases --- Reemerging infectious diseases --- Communicable diseases --- Microbial biology --- Biology --- Microorganisms --- Medical microbiology. --- Infectious diseases.
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