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https://www.readbyqxmd.com/read/29021974/role-of-low-molecular-mass-penicillin-binding-proteins-nagz-and-ampr-in-ampc-%C3%AE-lactamase-regulation-of-yersinia-enterocolitica
#1
Chang Liu, Chuchu Li, Yuhuang Chen, Huijing Hao, Junrong Liang, Ran Duan, Zhaoke Guo, Jing Zhang, Zhongzhi Zhao, Huaiqi Jing, Xin Wang, Shihe Shao
Yersinia enterocolitica encodes a chromosomal AmpC β-lactamase under the regulation of the classical ampR-ampC system. To obtain a further understanding to the role of low-molecular-mass penicillin-binding proteins (LMM PBPs) including PBP4, PBP5, PBP6, and PBP7, as well as NagZ and AmpR in ampC regulation of Y. enterocolitica, series of single/multiple mutant strains were systematically constructed and the ampC expression levels were determined by luxCDABE reporter system, reverse transcription-PCR (RT-PCR) and β-lactamase activity test...
2017: Frontiers in Cellular and Infection Microbiology
https://www.readbyqxmd.com/read/28609744/a-whole-cell-bioreporter-assay-for-quantitative-genotoxicity-evaluation-of-environmental-samples
#2
Bo Jiang, Guanghe Li, Yi Xing, Dayi Zhang, Jianli Jia, Zhisong Cui, Xiao Luan, Hui Tang
Whole-cell bioreporters have emerged as promising tools for genotoxicity evaluation, due to their rapidity, cost-effectiveness, sensitivity and selectivity. In this study, a method for detecting genotoxicity in environmental samples was developed using the bioluminescent whole-cell bioreporter Escherichia coli recA::luxCDABE. To further test its performance in a real world scenario, the E. coli bioreporter was applied in two cases: i) soil samples collected from chromium(VI) contaminated sites; ii) crude oil contaminated seawater collected after the Jiaozhou Bay oil spill which occurred in 2013...
October 2017: Chemosphere
https://www.readbyqxmd.com/read/28594177/a-versatile-toolbox-for-the-control-of-protein-levels-using-n-%C3%AE%C2%B5-acetyl-l-lysine-dependent-amber-suppression
#3
Wolfram Volkwein, Christopher Maier, Ralph Krafczyk, Kirsten Jung, Jürgen Lassak
The analysis of the function of essential genes in vivo depends on the ability to experimentally modulate levels of their protein products. Current methods to address this are based on transcriptional or post-transcriptional regulation of mRNAs, but approaches based on the exploitation of translation regulation have so far been neglected. Here we describe a toolbox, based on amber suppression in the presence of N(ε)-acetyl-l-lysine (AcK), for translational tuning of protein output. We chose the highly sensitive luminescence system LuxCDABE as a reporter and incorporated a UAG stop codon into the gene for the reductase subunit LuxC...
June 27, 2017: ACS Synthetic Biology
https://www.readbyqxmd.com/read/28511109/sensitive-detection-of-viable-escherichia-coli-o157-h7-from-foods-using-a-luciferase-reporter-phage-phiv10lux
#4
Jinwoo Kim, Minsik Kim, Seongmi Kim, Sangryeol Ryu
Escherichia coli O157:H7, a major foodborne pathogen, is a major public health concern associated with life-threatening diseases such as hemolytic uremic syndrome. To alleviate this burden, a sensitive and rapid system is required to detect this pathogen in various kinds of foods. Herein, we propose a phage-based pathogen detection method to replace laborious and time-consuming conventional methods. We engineered an E. coli O157:H7-specific phage phiV10 to rapidly and sensitively detect this notorious pathogen...
May 5, 2017: International Journal of Food Microbiology
https://www.readbyqxmd.com/read/28448559/hexa-is-a-versatile-regulator-involved-in-the-control-of-phenotypic-heterogeneity-of-photorhabdus-luminescens
#5
Angela Langer, Adriana Moldovan, Christian Harmath, Susan A Joyce, David J Clarke, Ralf Heermann
Phenotypic heterogeneity in microbial communities enables genetically identical organisms to behave differently even under the same environmental conditions. Photorhabdus luminescens, a bioluminescent Gram-negative bacterium, contains a complex life cycle, which involves a symbiotic interaction with nematodes as well as a pathogenic association with insect larvae. P. luminescens exists in two distinct phenotypic cell types, designated as the primary (1°) and secondary (2°) cells. The 1° cells are bioluminescent, pigmented and can support nematode growth and development...
2017: PloS One
https://www.readbyqxmd.com/read/28393499/a-growth-and-bioluminescence-based-bioreporter-for-the-in%C3%A2-vivo-detection-of-novel-biocatalysts
#6
Teunke van Rossum, Aleksandra Muras, Marco J J Baur, Sjoerd C A Creutzburg, John van der Oost, Servé W M Kengen
The use of bioreporters in high-throughput screening for small molecules is generally laborious and/or expensive. The technology can be simplified by coupling the generation of a desired compound to cell survival, causing only positive cells to stay in the pool of generated variants. Here, a dual selection/screening system was developed for the in vivo detection of novel biocatalysts. The sensor part of the system is based on the transcriptional regulator AraC, which controls expression of both a selection reporter (LeuB or KmR; enabling growth) for rapid reduction of the initially large library size and a screening reporter (LuxCDABE; causing bioluminescence) for further quantification of the positive variants...
May 2017: Microbial Biotechnology
https://www.readbyqxmd.com/read/28377931/inhibition-of-pseudomonas-aeruginosa-biofilm-formation-by-traditional-chinese-medicinal-herb-herba-patriniae
#7
Bo Fu, Qiaolian Wu, Minyan Dang, Dangdang Bai, Qiao Guo, Lixin Shen, Kangmin Duan
New antimicrobial agents are urgently needed to treat infections caused by drug-resistant pathogens and by pathogens capable of persisting in biofilms. The aim of this study was to identify traditional Chinese herbs that could inhibit biofilm formation of Pseudomonas aeruginosa, an important human pathogen that causes serious and difficult-to-treat infections in humans. A luxCDABE-based reporter system was constructed to monitor the expression of six key biofilm-associated genes in P. aeruginosa. The reporters were used to screen a library of 36 herb extracts for inhibitory properties against these genes...
2017: BioMed Research International
https://www.readbyqxmd.com/read/27875752/toxicity-evaluation-of-e-juice-and-its-soluble-aerosols-generated-by-electronic-cigarettes-using-recombinant-bioluminescent-bacteria-responsive-to-specific-cellular-damages
#8
Shiv Bharadwaj, Robert J Mitchell, Anjum Qureshi, Javed H Niazi
Electronic-cigarettes (e-cigarette) are widely used as an alternative to traditional cigarettes but their safety is not well established. Herein, we demonstrate and validate an analytical method to discriminate the deleterious effects of e-cigarette refills (e-juice) and soluble e-juice aerosol (SEA) by employing stress-specific bioluminescent recombinant bacterial cells (RBCs) as whole-cell biosensors. These RBCs carry luxCDABE-operon tightly controlled by promoters that specifically induced to DNA damage (recA), superoxide radicals (sodA), heavy metals (copA) and membrane damage (oprF)...
April 15, 2017: Biosensors & Bioelectronics
https://www.readbyqxmd.com/read/27687932/bioluminescent-avian-pathogenic-escherichia-coli-for-monitoring-colibacillosis-in-experimentally-infected-chickens
#9
Leon H Oosterik, Huruma N Tuntufye, Jessica Tsonos, Tom Luyten, Sam Noppen, Sandra Liekens, Rob Lavigne, Patrick Butaye, Bruno M Goddeeris
Avian pathogenic Escherichia coli (APEC) are responsible for significant economic losses in the poultry industry. In this study, a model for investigating the pathogenesis of APEC infections was established. APEC strain CH2 (O78) was marked with the luciferase operon (luxCDABE) using a Tn7 transposon and tissues of experimentally infected chickens were analysed for a correlation between the bioluminescent signal and the number of bacteria. Transposition of the lux operon into the chromosome of the APEC isolate did not affect sensitivity to lytic bacteriophages and there was no effect on virulence in an intratracheal infection model in 1-day-old chicks, although results with a subcutaneous infection model were inconclusive...
October 2016: Veterinary Journal
https://www.readbyqxmd.com/read/27664747/the-dna-mimic-antirestriction-proteins-arda-colib-p9-arn-t4-and-ocr-t7-as-activators-of-h-ns-dependent-gene-transcription
#10
Olga E Melkina, Ignatiy I Goryanin, Gennadii B Zavilgelsky
The antirestriction proteins ArdA ColIb-P9, Arn T4 and Ocr T7 specifically inhibit type I and type IV restriction enzymes and belong to the family of DNA-mimic proteins because their three-dimensional structure is similar to the double-helical B-form DNA. It is proposed that the DNA-mimic proteins are able to bind nucleoid protein H-NS and alleviate H-NS-silencing of the transcription of bacterial genes. Escherichia coli lux biosensors were constructed by inserting H-NS-dependent promoters into a vector, thereby placing each fragment upstream of the promoterless Photorhabdus luminescens luxCDABE operon...
November 2016: Microbiological Research
https://www.readbyqxmd.com/read/27572410/bioluminescent-reporters-for-rapid-mechanism-of-action-assessment-in-tuberculosis-drug-discovery
#11
Krupa Naran, Atica Moosa, Clifton E Barry, Helena I M Boshoff, Valerie Mizrahi, Digby F Warner
The tuberculosis (TB) drug discovery pipeline is fueled by compounds identified in whole-cell screens against the causative agent, Mycobacterium tuberculosis Phenotypic screening enables the selection of molecules that inhibit essential cellular functions in live, intact bacilli grown under a chosen in vitro condition. However, deducing the mechanism of action (MOA), which is important to avoid promiscuous targets, often requires significant biological resources in a lengthy process that risks decoupling medicinal chemistry and biology efforts...
November 2016: Antimicrobial Agents and Chemotherapy
https://www.readbyqxmd.com/read/27307098/infection-routes-of-aeromonas-salmonicida-in-rainbow-trout-monitored-in%C3%A2-vivo-by-real-time-bioluminescence-imaging
#12
S Bartkova, B Kokotovic, I Dalsgaard
Recent development of imaging tools has facilitated studies of pathogen infections in vivo in real time. This trend can be exemplified by advances in bioluminescence imaging (BLI), an approach that helps to visualize dissemination of pathogens within the same animal over several time points. Here, we employ bacterial BLI for examining routes of entry and spread of Aeromonas salmonicida susbp. salmonicida in rainbow trout. A virulent Danish A. salmonicida strain was tagged with pAKgfplux1, a dual-labelled plasmid vector containing the mutated gfpmut3a gene from Aequorea victoria and the luxCDABE genes from the bacterium Photorhabdus luminescens...
January 2017: Journal of Fish Diseases
https://www.readbyqxmd.com/read/27258332/construction-of-a-bioreporter-by-heterogeneously-expressing-a-vibrio-natriegens-reca-luxcdabe-fusion-in-escherichia-coli-and-genotoxicity-assessments-of-petrochemical-contaminated-groundwater-in-northern-china
#13
Bo Jiang, Wei E Huang, Guanghe Li
Here, we constructed an Escherichia coli recA::luxCDABE bioreporter for genotoxicity assessments. The recA promoter was cloned from the marine bacterium Vibrio natriegens. This bioreporter showed a dose-response relationship following induction by mitomycin C, and other pollutants or environmental samples could be calculated as mitomycin C equivalents, which provided a way to quantitatively compare the genotoxicities of different environmental samples. This bioreporter was used to evaluate the genotoxicity under a wide range of external environmental conditions, like temperatures ranging from 15 °C to 42 °C, pH between 4...
June 15, 2016: Environmental Science. Processes & Impacts
https://www.readbyqxmd.com/read/27191515/integration-host-factor-and-luxr-synergistically-bind-dna-to-coactivate-quorum-sensing-genes-in-vibrio-harveyi
#14
Ryan R Chaparian, Stephen G Olney, Christine M Hustmyer, Dean A Rowe-Magnus, Julia C van Kessel
The cell-cell signaling process called quorum sensing allows bacteria to control behaviors in response to changes in population density. In Vibrio harveyi, the master quorum-sensing transcription factor LuxR is a member of the TetR family of transcription factors that both activates and represses genes to coordinate group behaviors, including bioluminescence. Here, we show that integration host factor (IHF) is a key coactivator of the luxCDABE bioluminescence genes that is required together with LuxR for precise timing and expression levels of bioluminescence during quorum sensing...
September 2016: Molecular Microbiology
https://www.readbyqxmd.com/read/27165787/subtherapeutic-tetracycline-concentrations-aggravate-salmonella-typhimurium-infection-by-increasing-bacterial-virulence
#15
Elin Verbrugghe, Alexander Van Parys, Roel Haesendonck, Bregje Leyman, Filip Boyen, Freddy Haesebrouck, Frank Pasmans
OBJECTIVES: Antibiotics are among the most frequently prescribed drugs in human and animal medicine. With antibiotic resistance being a serious threat to veterinary and public health, the prudent use of antibiotics receives much attention. Less well known is that incorrect use of antimicrobial agents may also lead to increased bacterial virulence with the potential of a more severe clinical course of infection. Therefore, the aim of this study was to investigate the effect of subtherapeutic doses of tetracyclines on htpG virulence gene expression in Salmonella Typhimurium and on the course of salmonellosis...
August 2016: Journal of Antimicrobial Chemotherapy
https://www.readbyqxmd.com/read/26903133/substrate-independent-luminescent-phage-based-biosensor-to-specifically-detect-enteric-bacteria-such-as-e-coli
#16
Nathalie Franche, Manon Vinay, Mireille Ansaldi
Water quality is a major safety consideration in environments that are impacted by human activity. The key challenge of the COMBITOX project is to develop a unique instrument that can accommodate several biodetector systems (see the accompanying COMBITOX papers) able to detect different pollutants such as bacteria, toxins, and heavy metals. The output signal chosen by our consortium is based on luminescence detection. Our group recently developed phage-based biosensors using gfp as a reporter gene to detect enteric bacteria in complex environments such as sea water, and the main challenge we faced was to adapt our biodetector to a luminescent signal that could fit the COMBITOX project requirements...
January 2017: Environmental Science and Pollution Research International
https://www.readbyqxmd.com/read/26888530/the-unphosphorylated-form-of-the-pilr-two-component-system-regulates-pila-gene-expression-in-geobacter-sulfurreducens
#17
Alberto Hernández-Eligio, Ángel Andrade, Lizeth Soto, Enrique Morett, Katy Juárez
In Geobacter sulfurreducens, metal reduction and generation of bioelectricity require the participation of several elements, and among them, the type IV pili has an essential role. The pilus is composed of multiple PilA monomers. Expression of pilA gene depends mainly on the σ54 factor and the response regulator protein PilR. In this work, we characterized the role of the PilS-PilR two-component system in the regulation of the pilA gene expression. Experimental evidence indicates that PilS is autophosphorylated at the His-334 residue, which in turn is transferred to the conserved Asp-53 in PilR...
February 18, 2016: Environmental Science and Pollution Research International
https://www.readbyqxmd.com/read/26846129/bioluminescence-imaging-of-colonization-and-clearance-dynamics-of-brucella-suis-vaccine-strain-s2-in-mice-and-guinea-pigs
#18
Xiwen Wang, Zhiping Li, Bo Li, Hang Chi, Jiakuan Li, Hongchao Fan, Ruizhi Yao, Qianxue Li, Xiaolin Dong, Man Chen, Han Qu, Yuanyuan Wang, Weicun Gao, Yutian Wang, Yu Sun, Rui Sun, Jun Qian, Zhiping Xia
PURPOSE: The goal of this study was to develop a plasmid-based lux bio-reporter for use to obtain in vivo images of Brucella suis vaccine strain 2 (B.suis S2) infection with high resolution and good definition. PROCEDURES: The pBBR-lux (pBBR1MCS-2-lxCDABE) plasmid that carries the luxCDABE operon was introduced into B. suis S2 by electroporation yielding B. suis S2-lux. The spatial and temporal transit of B. suis S2 in mice and guinea pigs was monitored by bioluminescence imaging...
August 2016: Molecular Imaging and Biology: MIB: the Official Publication of the Academy of Molecular Imaging
https://www.readbyqxmd.com/read/26539165/transcriptional-profiling-of-vibrio-parahaemolyticus-exsa-reveals-a-complex-activation-network-for-type-iii-secretion
#19
Aaron C Liu, Nikhil A Thomas
Vibrio parahaemolyticus (Vp) is a marine halophilic bacterium that is commonly associated with oysters and shrimp. Human consumption of contaminated shellfish can result in Vp mediated gastroenteritis and severe diarrheal disease. Vp encodes two type 3 secretion systems (T3SS-1 and T3SS2) that have been functionally implicated in cytotoxicity and enterotoxicity respectively. In this study, we profiled protein secretion and temporal promoter activities associated with exsA and exsB gene expression. exsA is an AraC-like transcriptional activator that is critical for activating multiple operons that encode T3SS-1 genes, whereas exsB is thought to encode an outer membrane pilotin component for T3SS-1...
2015: Frontiers in Microbiology
https://www.readbyqxmd.com/read/26354701/application-of-internal-standard-method-in-recombinant-luminescent-bacteria-test
#20
Yong-Zhi Wang, Dan Li, Miao He
Mercury and its organic compounds have been of severe concern worldwide due to their damage to the ecosystem and human health. The development of effective and affordable technology to monitor and signal the presence of bioavailable mercury is an urgent need. The Mer gene is a mercury-responsive resistant gene, and a mercury-sensing recombinant luminescent bacterium using the Mer gene was constructed in this study. The mer operon from marine Pseudomonas putida strain SP1 was amplified and fused with prompterless luxCDABE in the pUCD615 plasmid within Escherichia coli cells, resulting in pTHE30-E...
September 1, 2015: Journal of Environmental Sciences (China)
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