The Complete Genome of the Atypical Enteropathogenic Escherichia coli Archetype Isolate E110019 Highlights a Role for Plasmids in Dissemination of the Type III Secreted Effector EspT Molecular Genomics

Enteropathogenic Escherichia coli (EPEC) is a leading cause of moderate to severe diarrhea among young children in developing countries, and EPEC isolates can be subdivided into two groups. Typical EPEC (tEPEC) bacteria are characterized by the presence of both the locus of enterocyte effacement (LEE) and the plasmid-encoded bundle-forming pilus (BFP), which are involved in adherence and translocation of type III effectors into the host cells. Atypical EPEC (aEPEC) bacteria also contain the LEE but lack the BFP. In the current report, we describe the complete genome of outbreak-associated aEPEC isolate E110019, which carries four plasmids. Comparative genomic analysis demonstrated that the type III secreted effector EspT gene, an autotransporter gene, a hemolysin gene, and putative fimbrial genes are all carried on plasmids. Further investigation of 65 espT-containing E. coli genomes demonstrated that different espT alleles are associated with multiple plasmids that differ in their overall gene content from the E110019 espT-containing plasmid. EspT has been previously described with respect to its role in the ability of E110019 to invade host cells. While other type III secreted effectors of E. coli have been identified on insertion elements and prophages of the chromosome, we demonstrated in the current study that the espT gene is located on multiple unique plasmids. These findings highlight a role of plasmids in dissemination of a unique E. coli type III secreted effector t...
Source: Infection and Immunity - Category: Infectious Diseases Authors: Tags: Molecular Genomics Source Type: research

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Publication date: Available online 12 October 2019Source: Journal of Hospital InfectionAuthor(s): Jaspreet Dhanda, James Gray, Ellen Knox, Amreen Bashir
Source: Journal of Hospital Infection - Category: Infectious Diseases Source Type: research
ConclusionIn summary, our results show that farms are an important reservoir of colistin-resistant E.coli, added to other additional genes, such as blaESBL. The transfer of manure from animals to soil and irrigation water might be spreading a mix of multiple resistances, posing a worrying threat to human health.Graphical abstract
Source: Journal of Global Antimicrobial Resistance - Category: Infectious Diseases Source Type: research
ConclusionsPA activates PXR signalling and suppresses NF-κB signalling, consequently causing ameliorating inflammation. Results highlight the importance of PXR–NF-κB crosstalk in colitis and suggest a novel therapeutic reagent.Graphical abstract
Source: Journal of Ethnopharmacology - Category: Drugs & Pharmacology Source Type: research
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Source: Medical Science Monitor - Category: Research Tags: Med Sci Monit Source Type: research
China reported another outbreak of the African swine fever on Sunday in its northwestern province of Gansu, the Ministry of Agriculture and Rural Affairs said on its website.
Source: Reuters: Health - Category: Consumer Health News Tags: healthNews Source Type: news
Publication date: Available online 12 October 2019Source: Enzyme and Microbial TechnologyAuthor(s): Soo-Yeon Yang, Tae-Rim Choi, Hye-Rim Jung, Ye-Lim Park, Yeong-Hoon Han, Hun-Suk Song, Ranjit Gurav, Shashi Kant Bhatia, Kyungmoon Park, Jung-Oh Ahn, Yung-Hun YangAbstractGlutaric acid is a C5 dicarboxylic acid that can be used as a building block for bioplastics. Although high concentrations of glutaric acid can be produced by fermentation or bioconversion, a large amount of α-ketoglutaric acid (α-KG) is necessary to accept the amine group from 5-aminovaleric acid. To decrease the demand for α-KG, we introd...
Source: Enzyme and Microbial Technology - Category: Biotechnology Source Type: research
Blessing O. Anonye1, Jack Hassall2, Jamie Patient3, Usanee Detamornrat3, Afnan M. Aladdad3, Stephanie Schüller4,5, Felicity R. A. J. Rose3 and Meera Unnikrishnan1* 1Microbiology and Infection Unit, Division of Biomedical Sciences, Warwick Medical School, University of Warwick, Coventry, United Kingdom 2Warwick Integrative Synthetic Biology Centre, School of Life Sciences, University of Warwick, Coventry, United Kingdom 3Division of Regenerative Medicine and Cellular Therapies, School of Pharmacy, Centre for Biomolecular Sciences, University of Nottingham, Nottingham, United Kingdom 4Norwich Medical School, F...
Source: Frontiers in Microbiology - Category: Microbiology Source Type: research
This study establishes RstAB as a major regulator of virulence and diverse cellular functions in P. damselae subsp. damselae. Introduction Two-component signal transduction systems enable bacteria to sense environmental stimuli and transfer this information across the cytoplasmic membrane to the cytoplasm (Stock et al., 2000). Such systems consist of a membrane-embedded protein kinase which acts as a sensory component, and its cognate response regulator, a cytoplasmic transcriptional factor. When the sensory component of the pair is stimulated by a specific signal, it autophosphorylates a histidine residue and then...
Source: Frontiers in Microbiology - Category: Microbiology Source Type: research
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Source: Microbiology - Category: Microbiology Authors: Tags: Microbiology Source Type: research
Abstract Giardia duodenalis is a prevalent cause of acute diarrheal disease worldwide. However, recent outbreaks in Italy and Norway have revealed a link between giardiasis and the subsequent development of chronic post-infectious irritable bowel syndrome (PI-IBS). While the mechanisms underlying the causation of PI-IBS remain obscure, recent findings suggest that alterations in gut microbiota communities are linked to the pathophysiology of IBS. In the present study, we use a laboratory biofilm system to culture and enrich mucosal microbiota from human intestinal biopsies. Subsequently, we show that co-culture wi...
Source: International Journal for Parasitology - Category: Parasitology Authors: Tags: Int J Parasitol Source Type: research
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