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https://www.readbyqxmd.com/read/30109846/an-introduction-to-the-structure-and-function-of-the-catalytic-core-enzyme-of-escherichia-coli-rna-polymerase
#1
Catherine Sutherland, Katsuhiko S Murakami
RNA polymerase (RNAP) is the essential enzyme responsible for transcribing genetic information stored in DNA to RNA. Understanding the structure and function of RNAP is important for those who study basic principles in gene expression, such as the mechanism of transcription and its regulation, as well as translational sciences such as antibiotic development. With over a half-century of investigations, there is a wealth of information available on the structure and function of Escherichia coli RNAP. This review introduces the structural features of E...
August 2018: EcoSal Plus
https://www.readbyqxmd.com/read/30066669/function-and-biogenesis-of-lipopolysaccharides
#2
Blake Bertani, Natividad Ruiz
The cell envelope is the first line of defense between a bacterium and the world-at-large. Often, the initial steps that determine the outcome of chemical warfare, bacteriophage infections, and battles with other bacteria or the immune system greatly depend on the structure and composition of the bacterial cell surface. One of the most studied bacterial surface molecules is the glycolipid known as lipopolysaccharide (LPS), which is produced by most Gram-negative bacteria. Much of the initial attention LPS received in the early 1900s was owed to its ability to stimulate the immune system, for which the glycolipid was commonly known as endotoxin...
August 2018: EcoSal Plus
https://www.readbyqxmd.com/read/30022749/spread-and-persistence-of-virulence-and-antibiotic-resistance-genes-a-ride-on-the-f-plasmid-conjugation-module
#3
Günther Koraimann
The F plasmid or F-factor is a large, 100-kbp, circular conjugative plasmid of Escherichia coli and was originally described as a vector for horizontal gene transfer and gene recombination in the late 1940s. Since then, F and related F-like plasmids have served as role models for bacterial conjugation. At present, more than 200 different F-like plasmids with highly related DNA transfer genes, including those for the assembly of a type IV secretion apparatus, are completely sequenced. They belong to the phylogenetically related MOBF12 A group...
July 2018: EcoSal Plus
https://www.readbyqxmd.com/read/29988001/periplasmic-chaperones-and-prolyl-isomerases
#4
Frederick Stull, Jean-Michel Betton, James C A Bardwell
The biogenesis of periplasmic and outer membrane proteins (OMPs) in Escherichia coli is assisted by a variety of processes that help with their folding and transport to their final destination in the cellular envelope. Chaperones are macromolecules, usually proteins, that facilitate the folding of proteins or prevent their aggregation without becoming part of the protein's final structure. Because chaperones often bind to folding intermediates, they often (but not always) act to slow protein folding. Protein folding catalysts, on the other hand, act to accelerate specific steps in the protein folding pathway, including disulfide bond formation and peptidyl prolyl isomerization...
July 2018: EcoSal Plus
https://www.readbyqxmd.com/read/29667573/molecular-epidemiology-of-extraintestinal-pathogenic-escherichia-coli
#5
James R Johnson, Thomas A Russo
Extraintestinal pathogenic Escherichia coli (ExPEC) are important pathogens in humans and certain animals. Molecular epidemiological analyses of ExPEC are based on structured observations of E. coli strains as they occur in the wild. By assessing real-world phenomena as they occur in authentic contexts and hosts, they provide an important complement to experimental assessment. Fundamental to the success of molecular epidemiological studies are the careful selection of subjects and the use of appropriate typing methods and statistical analysis...
April 2018: EcoSal Plus
https://www.readbyqxmd.com/read/29536829/pili-assembled-by-the-chaperone-usher-pathway-in-escherichia-coli-and-salmonella
#6
Glenn T Werneburg, David G Thanassi
Gram-negative bacteria assemble a variety of surface structures, including the hair-like organelles known as pili or fimbriae. Pili typically function in adhesion and mediate interactions with various surfaces, with other bacteria, and with other types of cells such as host cells. The chaperone/usher (CU) pathway assembles a widespread class of adhesive and virulence-associated pili. Pilus biogenesis by the CU pathway requires a dedicated periplasmic chaperone and integral outer membrane protein termed the usher, which forms a multifunctional assembly and secretion platform...
March 2018: EcoSal Plus
https://www.readbyqxmd.com/read/29424333/pathogenesis-of-proteus-mirabilis-infection
#7
Chelsie E Armbruster, Harry L T Mobley, Melanie M Pearson
Proteus mirabilis , a Gram-negative rod-shaped bacterium most noted for its swarming motility and urease activity, frequently causes catheter-associated urinary tract infections (CAUTIs) that are often polymicrobial. These infections may be accompanied by urolithiasis, the development of bladder or kidney stones due to alkalinization of urine from urease-catalyzed urea hydrolysis. Adherence of the bacterium to epithelial and catheter surfaces is mediated by 17 different fimbriae, most notably MR/P fimbriae...
February 2018: EcoSal Plus
https://www.readbyqxmd.com/read/29318984/a-brief-history-of-shigella
#8
Keith A Lampel, Samuel B Formal, Anthony T Maurelli
The history of Shigella , the causative agent of bacillary dysentery, is a long and fascinating one. This brief historical account starts with descriptions of the disease and its impact on human health from ancient time to the present. Our story of the bacterium starts just before the identification of the dysentery bacillus by Kiyoshi Shiga in 1898 and follows the scientific discoveries and principal scientists who contributed to the elucidation of Shigella pathogenesis in the first 100 years. Over the past century, Shigella has proved to be an outstanding model of an invasive bacterial pathogen and has served as a paradigm for the study of other bacterial pathogens...
January 2018: EcoSal Plus
https://www.readbyqxmd.com/read/29165233/the-sec-system-protein-export-in-escherichia-coli
#9
REVIEW
Jennine M Crane, Linda L Randall
In Escherichia coli , proteins found in the periplasm or the outer membrane are exported from the cytoplasm by the general secretory, Sec, system before they acquire stably folded structure. This dynamic process involves intricate interactions among cytoplasmic and membrane proteins, both peripheral and integral, as well as lipids. In vivo , both ATP hydrolysis and proton motive force are required. Here, we review the Sec system from the inception of the field through early 2016, including biochemical, genetic, and structural data...
November 2017: EcoSal Plus
https://www.readbyqxmd.com/read/28635589/regulation-of-escherichia-coli-pathogenesis-by-alternative-sigma-factor-n
#10
REVIEW
James T Riordan, Avishek Mitra
σN (also σ54 ) is an alternative sigma factor subunit of the RNA polymerase complex that regulates the expression of genes from many different ontological groups. It is broadly conserved in the Eubacteria with major roles in nitrogen metabolism, membrane biogenesis, and motility. σN is encoded as the first gene of a five-gene operon including rpoN (σN ), ptsN , hpf , rapZ , and npr that has been genetically retained among species of Escherichia , Shigella , and Salmonella . In an increasing number of bacteria, σN has been implicated in the control of genes essential to pathogenic behavior, including those involved in adherence, secretion, immune subversion, biofilm formation, toxin production, and resistance to both antimicrobials and biological stressors...
June 2017: EcoSal Plus
https://www.readbyqxmd.com/read/28593831/osmoregulated-periplasmic-glucans
#11
Sébastien Bontemps-Gallo, Jean-Pierre Bohin, Jean-Marie Lacroix
Among all the systems developed by enterobacteria to face osmotic stress, only osmoregulated periplasmic glucans (OPGs) were found to be modulated during osmotic fluxes. First detected in 1973 by E.P. Kennedy's group in a study of phospholipid turnover in Escherichia coli , OPGs have been shown across alpha, beta, and gamma subdivisions of the proteobacteria. Discovery of OPG-like compounds in the epsilon subdivision strongly suggested that the presence of periplasmic glucans is essential for almost all proteobacteria...
June 2017: EcoSal Plus
https://www.readbyqxmd.com/read/28443537/the-legacy-of-genetic-analysis-advances-contemporary-research-with-escherichia-coli-k-12-and-salmonella-enterica-serovar-typhimurium-lt2
#12
Valley Stewart
Escherichia coli K-12 and Salmonella enterica serovar Typhimurium LT2 became standard organisms for genetic analysis during the Truman administration. Half a century later, genetic analysis with these strains had become an art form, interpreted through 23 articles in the ambitious two-volume masterpiece edited by the late Fred Neidhardt and colleagues. These legacy articles now are available through EcoSal Plus , so as to inform and inspire contemporary genetic analyses in these standard organisms and their relatives...
April 2017: EcoSal Plus
https://www.readbyqxmd.com/read/28281437/systems-metabolic-engineering-of-escherichia-coli
#13
REVIEW
Kyeong Rok Choi, Jae Ho Shin, Jae Sung Cho, Dongsoo Yang, Sang Yup Lee
Systems metabolic engineering, which recently emerged as metabolic engineering integrated with systems biology, synthetic biology, and evolutionary engineering, allows engineering of microorganisms on a systemic level for the production of valuable chemicals far beyond its native capabilities. Here, we review the strategies for systems metabolic engineering and particularly its applications in Escherichia coli. First, we cover the various tools developed for genetic manipulation in E. coli to increase the production titers of desired chemicals...
March 2017: EcoSal Plus
https://www.readbyqxmd.com/read/28276312/targeting-and-insertion-of-membrane-proteins
#14
REVIEW
Andreas Kuhn, Hans-Georg Koch, Ross E Dalbey
The insertion and assembly of proteins into the inner membrane of bacteria are crucial for many cellular processes, including cellular respiration, signal transduction, and ion and pH homeostasis. This process requires efficient membrane targeting and insertion of proteins into the lipid bilayer in their correct orientation and proper conformation. Playing center stage in these events are the targeting components, signal recognition particle (SRP) and the SRP receptor FtsY, as well as the insertion components, the Sec translocon and the YidC insertase...
March 2017: EcoSal Plus
https://www.readbyqxmd.com/read/28084193/type-i-protein-secretion-deceptively-simple-yet-with-a-wide-range-of-mechanistic-variability-across-the-family
#15
REVIEW
I Barry Holland, Sandra Peherstorfer, Kerstin Kanonenberg, Michael Lenders, Sven Reimann, Lutz Schmitt
A very large type I polypeptide begins to reel out from a ribosome; minutes later, the still unidentifiable polypeptide, largely lacking secondary structure, is now in some cases a thousand or more residues longer. Synthesis of the final hundred C-terminal residues commences. This includes the identity code, the secretion signal within the last 50 amino acids, designed to dock with a waiting ATP binding cassette (ABC) transporter. What happens next is the subject of this review, with the main, but not the only focus on hemolysin HlyA, an RTX protein toxin secreted by the type I system...
December 2016: EcoSal Plus
https://www.readbyqxmd.com/read/27809955/live-attenuated-human-salmonella-vaccine-candidates-tracking-the-pathogen-in-natural-infection-and-stimulation-of-host-immunity
#16
REVIEW
James E Galen, Amanda D Buskirk, Sharon M Tennant, Marcela F Pasetti
Salmonellosis, caused by members of the genus Salmonella, is responsible for considerable global morbidity and mortality in both animals and humans. In this review, we will discuss the pathogenesis of Salmonella enterica serovar Typhi and Salmonella enterica serovar Typhimurium, focusing on human Salmonella infections. We will trace the path of Salmonella through the body, including host entry sites, tissues and organs affected, and mechanisms involved in both pathogenesis and stimulation of host immunity. Careful consideration of the natural progression of disease provides an important context in which attenuated live oral vaccines can be rationally designed and developed...
November 2016: EcoSal Plus
https://www.readbyqxmd.com/read/27735786/animal-enterotoxigenic-escherichia-coli
#17
REVIEW
J Daniel Dubreuil, Richard E Isaacson, Dieter M Schifferli
Enterotoxigenic Escherichia coli (ETEC) is the most common cause of E. coli diarrhea in farm animals. ETEC are characterized by the ability to produce two types of virulence factors: adhesins that promote binding to specific enterocyte receptors for intestinal colonization and enterotoxins responsible for fluid secretion. The best-characterized adhesins are expressed in the context of fimbriae, such as the F4 (also designated K88), F5 (K99), F6 (987P), F17, and F18 fimbriae. Once established in the animal small intestine, ETEC produce enterotoxin(s) that lead to diarrhea...
October 2016: EcoSal Plus
https://www.readbyqxmd.com/read/27735785/the-mosaic-type-iv-secretion-systems
#18
REVIEW
Peter J Christie
Escherichia coli and other Gram-negative and -positive bacteria employ type IV secretion systems (T4SSs) to translocate DNA and protein substrates, generally by contact-dependent mechanisms, to other cells. The T4SSs functionally encompass two major subfamilies, the conjugation systems and the effector translocators. The conjugation systems are responsible for interbacterial transfer of antibiotic resistance genes, virulence determinants, and genes encoding other traits of potential benefit to the bacterial host...
October 2016: EcoSal Plus
https://www.readbyqxmd.com/read/27735784/anaerobic-formate-and-hydrogen-metabolism
#19
REVIEW
Constanze Pinske, R Gary Sawers
Numerous recent developments in the biochemistry, molecular biology, and physiology of formate and H2 metabolism and of the [NiFe]-hydrogenase (Hyd) cofactor biosynthetic machinery are highlighted. Formate export and import by the aquaporin-like pentameric formate channel FocA is governed by interaction with pyruvate formate-lyase, the enzyme that generates formate. Formate is disproportionated by the reversible formate hydrogenlyase (FHL) complex, which has been isolated, allowing biochemical dissection of evolutionary parallels with complex I of the respiratory chain...
October 2016: EcoSal Plus
https://www.readbyqxmd.com/read/27419387/the-enterobacterial-genotoxins-cytolethal-distending-toxin-and-colibactin
#20
REVIEW
Frederic Taieb, Claude Petit, Jean-Philippe Nougayrède, Eric Oswald
While the DNA damage induced by ionizing radiation and by many chemical compounds and drugs is well characterized, the genotoxic insults inflicted by bacteria are only scarcely documented. However, accumulating evidence indicates that we are exposed to bacterial genotoxins. The prototypes of such bacterial genotoxins are the Cytolethal Distending Toxins (CDTs) produced by Escherichia coli and Salmonella enterica serovar Typhi. CDTs display the DNase structure fold and activity, and induce DNA strand breaks in the intoxicated host cell nuclei...
July 2016: EcoSal Plus
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