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https://www.readbyqxmd.com/read/28413638/serologic-testing-of-a-panel-of-five-antibodies-in-inflammatory-bowel-diseases-diagnostic-value-and-correlation-with-disease-phenotype
#1
Zhi-Zhi Wang, Ke Shi, Jie Peng
The aim of the present study was to evaluate the diagnostic value of five serological antibodies, perinuclear antineutrophil cytoplasmic antibody (pANCA), anti-Saccharomyces cerevisiae antibodies [ASCA; ASCA-immunoglobulin (IgG)and ASCA-IgA], Escherichia coli outer membrane porin C antibody (anti-OmpC) and CBir1 flagellin antibody for detection in inflammatory bowel diseases. Whether the antibody status correlated with the disease phenotype was also evaluated. Sera from 71 patients with Crohn's disease (CD), 41 patients with ulcerative colitis (UC), 78 patients with other gastrointestinal diseases and 31 healthy control subjects were investigated...
April 2017: Biomedical Reports
https://www.readbyqxmd.com/read/28399854/improved-n-butanol-production-via-co-expression-of-membrane-targeted-tilapia-metallothionein-and-the-clostridial-metabolic-pathway-in-escherichia-coli
#2
Wei-Chih Chin, Kuo-Hsing Lin, Chun-Chi Liu, Kenji Tsuge, Chieh-Chen Huang
BACKGROUND: N-Butanol has favorable characteristics for use as either an alternative fuel or platform chemical. Bio-based n-butanol production using microbes is an emerging technology that requires further development. Although bio-industrial microbes such as Escherichia coli have been engineered to produce n-butanol, reactive oxygen species (ROS)-mediated toxicity may limit productivity. Previously, we show that outer-membrane-targeted tilapia metallothionein (OmpC-TMT) is more effective as an ROS scavenger than human and mouse metallothioneins to reduce oxidative stress in the host cell...
April 11, 2017: BMC Biotechnology
https://www.readbyqxmd.com/read/28398866/genome-wide-survey-of-genes-under-positive-selection-in-avian-pathogenic-escherichia-coli-strains
#3
Thaís Cabrera Galvão Rojas, Francisco Pereira Lobo, Jorge Augusto Hongo, Renato Vicentini, Renu Verma, Renato Pariz Maluta, Wanderley Dias da Silveira
The ability to obtain bacterial genomes from the same host has allowed for comparative studies that help in the understanding of the molecular evolution of specific pathotypes. Avian pathogenic Escherichia coli (APEC) is a group of extraintestinal strains responsible for causing colibacillosis in birds. APEC is also suggested to possess a role as a zoonotic agent. Despite its importance, APEC pathogenesis still has several cryptic pathogenic processes that need to be better understood. In this work, a genome-wide survey of eight APEC strains for genes with evidence of recombination revealed that ∼14% of the homologous groups evaluated present signs of recombination...
May 2017: Foodborne Pathogens and Disease
https://www.readbyqxmd.com/read/28372037/construction-of-methanol-sensing-escherichia-coli-by-the-introduction-of-paracoccus-denitrificans-mxay-based-chimeric-two-component-system
#4
Irisappan Ganesh, Selvamani Vidhya, Gyeong Tae Eom, Soon Ho Hong
Escherichia coli, which does not have methanol sensing apparatus, was engineered to sense methanol by employing chimeric two-component system (TCS) strategy. A chimeric MxaY/EnvZ (MxaYZ) TCS was constructed by fusing the Paracoccus denitrificans MxaY with the E. coli EnvZ. Real-time quantitative PCR analysis and GFP-based fluorescence analysis showed that the ompC expression level and the fluorescence were increased as methanol concentration increased up to 0.01 %, respectively. These results suggested that E...
April 3, 2017: Journal of Microbiology and Biotechnology
https://www.readbyqxmd.com/read/28351921/cdia-effectors-use-modular-receptor-binding-domains-to-recognize-target-bacteria
#5
Zachary C Ruhe, Josephine Y Nguyen, Jing Xiong, Sanna Koskiniemi, Christina M Beck, Basil R Perkins, David A Low, Christopher S Hayes
Contact-dependent growth inhibition (CDI) systems encode CdiA effectors, which bind to specific receptors on neighboring bacteria and deliver C-terminal toxin domains to suppress target cell growth. Two classes of CdiA effectors that bind distinct cell surface receptors have been identified, but the molecular basis of receptor specificity is not understood. Alignment of BamA-specific CdiA(EC93) from Escherichia coli EC93 and OmpC-specific CdiA(EC536) from E. coli 536 suggests that the receptor-binding domain resides within a central region that varies between the two effectors...
March 28, 2017: MBio
https://www.readbyqxmd.com/read/28337196/salmonella-typhi-porins-ompc-and-ompf-are-potent-adjuvants-for-t-dependent-and-t-independent-antigens
#6
Marisol Pérez-Toledo, Nuriban Valero-Pacheco, Rodolfo Pastelin-Palacios, Cristina Gil-Cruz, Christian Perez-Shibayama, Mario A Moreno-Eutimio, Ingeborg Becker, Sonia Mayra Pérez-Tapia, Lourdes Arriaga-Pizano, Adam F Cunningham, Armando Isibasi, Laura C Bonifaz, Constantino López-Macías
Several microbial components, such as bacterial DNA and flagellin, have been used as experimental vaccine adjuvants because of their inherent capacity to efficiently activate innate immune responses. Likewise, our previous work has shown that the major Salmonella Typhi (S. Typhi) outer membrane proteins OmpC and OmpF (porins) are highly immunogenic protective antigens that efficiently stimulate innate and adaptive immune responses in the absence of exogenous adjuvants. Moreover, S. Typhi porins induce the expression of costimulatory molecules on antigen-presenting cells through toll-like receptor canonical signaling pathways...
2017: Frontiers in Immunology
https://www.readbyqxmd.com/read/28315387/functional-role-of-ompf-and-ompc-porins-in-pathogenesis-of-avian-pathogenic-escherichia-coli
#7
Hassan M A Hejair, Yinchu Zhu, Jiale Ma, Yue Zhang, Zihao Pan, Wei Zhang, Huochun Yao
Avian pathogenic Escherichia coli is an important pathogen causes systemic infections in avian species and large economic losses in poultry industry worldwide. The functional role of porins during the infection and their mechanisms of interaction with host tissues for adhesion to and invasion are poorly understood. However, whether porins play a role in infection remains unclear. In this study we evaluated the potential of ompF and ompC outer membrane porins in the pathogenesis of avian pathogenic E. coli (APEC) strain TW-XM...
March 14, 2017: Microbial Pathogenesis
https://www.readbyqxmd.com/read/28264855/structural-alteration-of-ompr-as-a-source-of-ertapenem-resistance-in-a-ctx-m-15-producing-escherichia-coli-o25b-h4-sequence-type-131-clinical-isolate
#8
Hervé Dupont, Pascaline Choinier, David Roche, Sandine Adiba, Megan Sookdeb, Catherine Branger, Erick Denamur, Hedi Mammeri
In this study, an ertapenem-nonsusceptible Escherichia coli isolate was investigated to determine the genetic basis for its carbapenem resistance phenotype. This clinical strain was recovered from a patient that received, 1 year previously, ertapenem to treat a cholangitis due to a carbapenem-susceptible extended-spectrum-β-lactamase (ESBL)-producing E. coli isolate. Whole-genome sequencing of these strains was performed using Illumina and single-molecule real-time sequencing technologies. It revealed that they belonged to the ST131 clonal group, had the predicted O25b:H4 serotype, and produced the CTX-M-15 and TEM-1 β-lactamases...
May 2017: Antimicrobial Agents and Chemotherapy
https://www.readbyqxmd.com/read/28198105/antibiotic-dependent-perturbations-of-extended-spectrum-beta-lactamase-producing-klebsiella-pneumoniae-proteome
#9
Moo-Jin Suh, Sarah L Keasey, Ernst E Brueggemann, Robert G Ulrich
Extended spectrum beta-lactamase producing Klebsiella pneumoniae (ESBL-KP) causes life-threatening infections in susceptible and immuno-compromised individuals. Because of the emergence of multidrug resistance and tolerance, it is crucial to better understand the mechanisms by which ESBL-KP can adapt to antibiotic stress. The aim of this study was to provide an overview of the global proteome changes occurring in ESBL-KP in response to sub-lethal concentrations of the antibiotics doxycycline (DC, bacteriostatic) and streptomycin (SM, bactericidal), which both impair ribosomal synthesis of bacterial proteins...
May 2017: Proteomics
https://www.readbyqxmd.com/read/28137507/construction-and-evaluation-of-an-edwardsiella-tarda-dna-vaccine-encoding-outer-membrane-protein-c
#10
Fuguo Liu, Xiaoqian Tang, Xiuzhen Sheng, Jing Xing, Wenbin Zhan
Outer membrane protein C is a porin that resides in the outer membrane, and it has been identified as an antigenic protein in many bacteria, such as Escherichia coli, Salmonella typhi, Aeromonas hydrophila and Edwardsiella tarda. In the present work, we aimed at evaluating the immune protective potential of E. tarda OmpC as a DNA vaccine. For this purpose, a recombinant DNA plasmid encoding OmpC (pCG-OmpC) gene was constructed and its vaccine potential was analyzed in a flounder (Paralichthys olivaceus) model...
March 2017: Microbial Pathogenesis
https://www.readbyqxmd.com/read/28134784/sibling%C3%A2-srna%C3%A2-ryfa1%C3%A2-influences%C3%A2-shigella%C3%A2-dysenteriae-pathogenesis
#11
Megan E Fris, William H Broach, Sarah E Klim, Peter W Coschigano, Ronan K Carroll, Clayton C Caswell, Erin R Murphy
Small regulatory RNAs (sRNAs) of Shigella dysenteriae and other pathogens are vital for the regulation of virulence-associated genes and processes. Here, we characterize RyfA1, one member of a sibling pair of sRNAs produced by S. dysenteriae. Unlike its nearly identical sibling molecule, RyfA2, predicted to be encoded almost exclusively by non-pathogenic species, the presence of a gene encoding RyfA1, or a RyfA1-like molecule, is strongly correlated with virulence in a variety of enteropathogens. In S. dysenteriae, the overproduction of RyfA1 negatively impacts the virulence-associated process of cell-to-cell spread as well as the expression of ompC, a gene encoding a major outer membrane protein important for the pathogenesis of Shigella...
January 26, 2017: Genes
https://www.readbyqxmd.com/read/28109883/probing-transport-of-charged-%C3%AE-lactamase-inhibitors-through-ompc-a-membrane-channel-from-e-%C3%A2-coli
#12
Ishan Ghai, Mathias Winterhalter, Richard Wagner
One of the major causes of antibiotic resistance in the Gram-negative bacteria is the low permeability across the outer membrane. Currently a main bottleneck in the development of effective antibiotics is the lack of a general method to quantify permeation which would allow screening for optimal scaffolds. Here, we present a permeation assay based on conventional electrophysiology. The method mainly involves application of concentration gradients of charged molecules with different electrophoretic mobilities through a membrane channel...
January 18, 2017: Biochemical and Biophysical Research Communications
https://www.readbyqxmd.com/read/28076882/characterization-of-salmonella-typhi-ompc-and-ompf-porins-engineered-with-hiv-gp41-epitope-on-the-surface-loops
#13
Madhuranayaki Thulasingam, Subha Damodharan, Gopal Madhana Vigneshwari, Eswari P J Pandaranayaka, Luke Elizabeth Hanna, Ramakrishnan Usha, Sankaran Krishnaswamy
Porins form trimers in the outer membrane and help transport nutrients and waste products across the bacterial cell membrane. Porin loops are suitable candidates as display systems due to their high immunogenicity and presentation at the bacterial cell surface. In this study, Salmonella typhi porins (OmpC and OmpF) engineered with the Kennedy peptide from gp41 of HIV were characterised. The chimeric OmpC carrying the Kennedy peptide in loop7 did not trimerise, whereas the chimeric OmpF with the epitope in loop5 formed trimers and also was recognised by the antibodies in the HIV patient serum...
January 11, 2017: Proteins
https://www.readbyqxmd.com/read/27990800/bacteriophage-based-bioconjugates-as-a-flow-cytometry-probe-for-fast-bacteria-detection
#14
Marta Janczuk, Łukasz Richter, Grażyna Hoser, Jerzy Kawiak, Marcin Łoś, Joanna Niedziółka-Jönsson, Jan Paczesny, Robert Hołyst
Robust detection of bacteria can significantly reduce risks of nosocomial infections, which are a serious problem even in developed countries (4.1 million cases each year in Europe). Here we demonstrate utilization of novel multifunctional bioconjugates as specific probes for bacteria detection. Bifunctional magnetic-fluorescent microparticles are coupled with bacteriophages. The T4 bacteriophage, due to its natural affinity to bacterial receptors, namely, OmpC and LPS, enables specific and efficient detection of Escherichia coli bacteria...
December 19, 2016: Bioconjugate Chemistry
https://www.readbyqxmd.com/read/27976801/serologic-antibodies-in-relation-to-outcome-in-post-operative-crohn-s-disease
#15
Amy L Hamilton, Michael A Kamm, Peter De Cruz, Emily K Wright, Fabiyola Selvaraj, Fred Princen, Alexandra Gorelik, Danny Liew, Ian C Lawrance, Jane M Andrews, Peter A Bampton, Miles P Sparrow, Timothy H Florin, Peter R Gibson, Henry Debinski, Richard B Gearry, Finlay A Macrae, Rupert W Leong, Ian Kronborg, Graham Radford-Smith, Warwick Selby, Sally J Bell, Steven J Brown, William R Connell
BACKGROUND: Disease recurs frequently after Crohn's disease resection. The role of serological antimicrobial antibodies in predicting recurrence or as a marker of recurrence has not been well defined. METHODS: 169 patients (523 samples) were prospectively studied, with testing peri-operatively, and 6, 12 and 18 months post-operatively. Colonoscopy was performed at 18 months post-operatively. Serologic antibody presence (pANCA, ASCA IgA/IgG, anti-OmpC, anti-CBir1, anti-A4-Fla2, anti-Fla-X) and titre were tested...
December 15, 2016: Journal of Gastroenterology and Hepatology
https://www.readbyqxmd.com/read/27916690/acyl-homoserine-lactone-changes-the-abundance-of-proteins-and-the-levels-of-organic-acids-associated-with-stationary-phase-in-salmonella-enteritidis
#16
Felipe Alves de Almeida, Natan de Jesus Pimentel-Filho, Lanna Clícia Carrijo, Cláudia Braga Pereira Bento, Maria Cristina Baracat-Pereira, Uelinton Manoel Pinto, Leandro Licursi de Oliveira, Maria Cristina Dantas Vanetti
Quorum sensing (QS) is cell-cell communication mechanism mediated by signaling molecules known as autoinducers (AIs) that lead to differential gene expression. Salmonella is unable to synthesize the AI-1 acyl homoserine lactone (AHL), but is able to recognize AHLs produced by other microorganisms through SdiA protein. Our study aimed to evaluate the influence of AI-1 on the abundance of proteins and the levels of organic acids of Salmonella Enteritidis. The presence of N-dodecyl-homoserine lactone (C12-HSL) did not interfere on the growth or the total amount of extracted proteins of Salmonella...
January 2017: Microbial Pathogenesis
https://www.readbyqxmd.com/read/27887202/serological-markers-in-diagnosis-of-pediatric-inflammatory-bowel-disease-and-as-predictors-for-early-tumor-necrosis-factor-blocker-therapy
#17
Christine Olbjørn, Milada Cvancarova Småstuen, Espen Thiis-Evensen, Britt Nakstad, Morten Harald Vatn, Gøri Perminow
OBJECTIVE: To describe the prevalence of serological markers in newly diagnosed treatment-naïve pediatric inflammatory bowel disease (IBD), their utility in differentiating Crohn's disease (CD), ulcerative colitis (UC) and symptomatic non-IBD patients and whether serological markers are associated with early TNF blocker treatment. MATERIAL AND METHODS: Ninety-six children and adolescents <18 years, 58 with IBD and 38 symptomatic non-IBD controls were included...
April 2017: Scandinavian Journal of Gastroenterology
https://www.readbyqxmd.com/read/27832917/immune-response-characterization-and-vaccine-potential-of-a-recombinant-chimera-comprising-b-cell-epitope-of-aeromonas-hydrophila-outer-membrane-protein-c-and-ltb
#18
Mahima Sharma, Aparna Dixit
Aeromonas hydrophila is one of the most virulent fish pathogens, causing colossal economic losses to the aquaculture industry annually. The absence of a safe and effective vaccine makes it very difficult to control this infection. Outer membrane proteins have been widely illustrated to confer protective immunity against a broad spectrum of gram negative bacteria. In the current study, we have analyzed the ability of B-cell epitopes of A. hydrophila's outer membrane protein C (OmpC) to confer protection against bacterial virulence...
December 7, 2016: Vaccine
https://www.readbyqxmd.com/read/27799202/acquisition-of-carbapenem-resistance-by-plasmid-encoded-ampc-expressing-escherichia-coli
#19
Ria van Boxtel, Agnes A Wattel, Jesús Arenas, Wil H F Goessens, Jan Tommassen
Although AmpC β-lactamases can barely degrade carbapenems, if at all, they can sequester them and prevent them from reaching their targets. Thus, carbapenem resistance in Escherichia coli and other Enterobacteriaceae can result from AmpC production and simultaneous reduction of antibiotic influx into the periplasm by mutations in the porin genes. Here we investigated the route and genetic mechanisms of acquisition of carbapenem resistance in a clinical E. coli isolate carrying blaCMY-2 on a plasmid by selecting for mutants that are resistant to increasing concentrations of meropenem...
January 2017: Antimicrobial Agents and Chemotherapy
https://www.readbyqxmd.com/read/27775882/application-of-noncanonical-amino-acids-for-protein-labeling-in-a-genomically-recoded-escherichia-coli
#20
Kalle Kipper, Ebba Gregorsson Lundius, Vladimir Curic, Ivana Nikic, Edward A Lemke, Manfred Wiessler, Johan Elf
Small synthetic fluorophores are in many ways superior to fluorescent proteins as labels for imaging. A major challenge is to use them for a protein-specific labeling in living cells. Here, we report on our use of noncanonical amino acids that are genetically encoded via the pyrrolysyl-tRNA/pyrrolysyl-RNA synthetase pair at artificially introduced TAG codons in a recoded E. coli strain. The strain is lacking endogenous TAG codons and the TAG-specific release factor RF1. The amino acids contain bioorthogonal groups that can be clicked to externally supplied dyes, thus enabling protein-specific labeling in live cells...
October 24, 2016: ACS Synthetic Biology
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