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https://www.readbyqxmd.com/read/28527130/pulse-generation-in-the-quorum-machinery-of-pseudomonas-aeruginosa
#1
Cicik Alfiniyah, Martin A Bees, A Jamie Wood
Pseudomonas aeruginosa is a Gram-negative bacterium that is responsible for a wide range of infections in humans. Colonies employ quorum sensing (QS) to coordinate gene expression, including for virulence factors, swarming motility and complex social traits. The QS signalling system of P. aeruginosa is known to involve multiple control components, notably the las, rhl and pqs systems. In this paper, we examine the las system and, in particular, the repressive interaction of rsaL, an embedded small regulative protein, employing recent biochemical information to aid model construction...
May 19, 2017: Bulletin of Mathematical Biology
https://www.readbyqxmd.com/read/28526858/expression-and-activity-of-the-bioh-esterase-of-biotin-synthesis-is-independent-of-genome-context
#2
Xinyun Cao, Lei Zhu, Zhe Hu, John E Cronan
BioH is an α/β-hydrolase required for synthesis of the pimelate moiety of biotin in diverse bacteria. The bioH gene is found in different genomic contexts. In some cases (e.g., Escherichia coli) the gene is not located within a biotin synthetic operon and its transcription is not coregulated with the other biotin synthesis genes. In other genomes such as Pseudomonas aeruginosa the bioH gene is within a biotin synthesis operon and its transcription is coregulated with the other biotin operon genes. The esterases of pimelate moiety synthesis show remarkable genomic plasticity in that in some biotin operons bioH is replaced by other α/ß hydrolases of diverse sequence...
May 19, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28526802/macrolide-resistance-in-pseudomonas-aeruginosa-implications-for-practice
#3
EDITORIAL
James D Chalmers
No abstract text is available yet for this article.
May 2017: European Respiratory Journal: Official Journal of the European Society for Clinical Respiratory Physiology
https://www.readbyqxmd.com/read/28526799/acquired-resistance-to-macrolides-in-pseudomonas-aeruginosa-from-cystic-fibrosis-patients
#4
Muhammad-Hariri Mustafa, Shaunak Khandekar, Michael M Tunney, J Stuart Elborn, Barbara C Kahl, Olivier Denis, Patrick Plésiat, Hamidou Traore, Paul M Tulkens, Francis Vanderbist, Françoise Van Bambeke
Cystic fibrosis (CF) patients receive chronic treatment with macrolides for their antivirulence and anti-inflammatory properties. We, however, previously showed that Pseudomonas aeruginosa, considered as naturally resistant to macrolides, becomes susceptible when tested in a eukaryotic medium rather than a conventional broth.We therefore looked for specific macrolide resistance determinants in 333 CF isolates from four European CF centres in comparison with 48 isolates from patients suffering from hospital-acquired pneumonia (HAP)...
May 2017: European Respiratory Journal: Official Journal of the European Society for Clinical Respiratory Physiology
https://www.readbyqxmd.com/read/28526665/the-sensor-study-protocol-for-a-mixed-methods-study-of-self-management-checks-to-predict-exacerbations-of-pseudomonas-aeruginosa-in-patients-with-long-term-respiratory-conditions
#5
Claire Roberts, Thomas L Jones, Samal Gunatilake, Will Storrar, Scott Elliott, Sharon Glaysher, Ben Green, Steven Rule, Carole Fogg, Ann Dewey, Kevin A Auton, Anoop J Chauhan
BACKGROUND: There are an estimated three million people in the United Kingdom with chronic obstructive pulmonary disease (COPD), and the incidence of bronchiectasis is estimated at around 0.1% but is more common in COPD and severe asthma. Both COPD and bronchiectasis are characterized by exacerbations in which bacteria play a central role. Pseudomonas aeruginosa is isolated from sputum samples from 4% to 15% of adults with COPD and is more likely to be isolated from patients with severe disease...
May 19, 2017: JMIR Research Protocols
https://www.readbyqxmd.com/read/28526525/high-throughput-estimation-of-specific-activities-of-enzyme-mutants-in-cell-lysates-through-immunoturbidimetric-assay-of-proteins
#6
Xiaolan Yang, Yiran Feng, Huimin Chong, Deqiang Wang, Xiaolei Hu, Jun Pu, Chang-Guo Zhan, Fei Liao
High-throughput estimation of specific activities of an enzyme and its mutants in a group (enzyme/mutants) in cell lysates via high-throughput assay of their activities and separate immunoturbidimetric assay (ITA) of their proteins was proposed. Pseudomonas aeruginosa arylsulfatase (PAAS) and Bacillus fastidious uricase (BFU) served as two models. ITA employed 0.75 mg of antisera against PAAS or BFU as the reference in 96-well microplates to measure the difference of extinction at 340 and 700 nm. According to the calibration curve, ITA quantified the reference from 0...
May 16, 2017: Analytical Biochemistry
https://www.readbyqxmd.com/read/28525997/increased-resistance-of-gram-negative-urinary-pathogens-after-kidney-transplantation
#7
Johannes Korth, Julia Kukalla, Peter-Michael Rath, Sebastian Dolff, Marco Krull, Hana Guberina, Anja Bienholz, Benjamin Wilde, Stefan Becker, Birgit Ross, Olympia Evdoxia Anastasiou, Andreas Kribben, Oliver Witzke
BACKGROUND: Urinary tract infection is the most common complication after kidney transplantation. It can cause severe sepsis and transplant loss. Emergence of drug resistance among gram-negative urinary pathogens is the current challenge for urinary tract infection treatment after kidney transplantation. METHODS: This study analyzes the antimicrobial susceptibility of gram-negative urinary pathogens after kidney transplantation from 2009 to 2012 at the Transplant Outpatient Clinic of the University Hospital Essen, Germany...
May 19, 2017: BMC Nephrology
https://www.readbyqxmd.com/read/28525642/dynamics-of-sequestration-based-gene-regulatory-cascades
#8
Tatenda Shopera, William R Henson, Tae Seok Moon
Gene regulatory cascades are ubiquitous in biology. Because regulatory cascades are integrated within complex networks, their quantitative analysis is challenging in native systems. Synthetic biologists have gained quantitative insights into the properties of regulatory cascades by building simple circuits, but sequestration-based regulatory cascades remain relatively unexplored. Particularly, it remains unclear how the cascade components collectively control the output dynamics. Here, we report the construction and quantitative analysis of the longest sequestration-based cascade in Escherichia coli...
May 19, 2017: Nucleic Acids Research
https://www.readbyqxmd.com/read/28524209/understanding-the-biomimetic-properties-of-gallium-in-pseudomonas-aeruginosa-an-xas-and-xps-study
#9
F Porcaro, C Bonchi, A Ugolini, E Frangipani, G Polzonetti, P Visca, C Meneghini, C Battocchio
Pyochelin (PCH) is a siderophore (extracellular chelator) produced by the pathogenic bacterium Pseudomonas aeruginosa (PAO). PCH is implicated in iron (Fe(3+)) transport to PAO, and is crucial for its metabolism and pathogenicity. Due to the chemical similarity with Fe(3+), gallium (Ga(3+)) interferes with vital iron-dependent processes in bacterial cells, thereby opening new perspectives for the design of specific metal-based antibacterial drugs. However, the structural basis for the Fe(3+)-mimetic properties of Ga(3+) complexed with the PCH siderophore is still lacking...
May 19, 2017: Dalton Transactions: An International Journal of Inorganic Chemistry
https://www.readbyqxmd.com/read/28524087/in-vitro-assessment-of-early-bacterial-activity-on-micro-nanostructured-ti6al4v-surfaces
#10
Benjamin Valdez-Salas, Ernesto Beltrán-Partida, Sandra Castillo-Uribe, Mario Curiel-Álvarez, Roumen Zlatev, Margarita Stoytcheva, Gisela Montero-Alpírez, Lidia Vargas-Osuna
It is imperative to understand and systematically compare the initial interactions between bacteria genre and surface properties. Thus, we fabricated a flat, anodized with 80 nm TiO₂ nanotubes (NTs), and a rough Ti6Al4V surface. The materials were characterized using field-emission scanning electron microscopy (FE-SEM), energy dispersive X-ray spectroscopy (EDX) and atomic force microscopy (AFM). We cultured in vitro Staphylococcus epidermidis (S. epidermidis) and Pseudomonas aeruginosa (P. aeruginosa) to evaluate the bacterial-surface behavior by FE-SEM and viability calculation...
May 18, 2017: Molecules: a Journal of Synthetic Chemistry and Natural Product Chemistry
https://www.readbyqxmd.com/read/28524024/-efficacy-and-safety-of-colistimethate-sodium-in-critical-patients-an-in-vitro-study-by-using-of-monte-carlo-simulation
#11
Aijun Pan, Qing Mei, Tianjun Yang, Xiaolan Gao, Huaiwei Lu, Ying Ye, Jiabin Li, Bao Liu
OBJECTIVE: To evaluate the efficacy and safety of colistimethate sodium (CMS) for the treatment of critical patients infected by pan-drug resistant Acinetobacter baumannii (PDR-AB) or pan-drug resistant Pseudomonas aeruginosa (PDR-PA). METHODS: 321 isolates of PDR-AB and 204 isolates of PDR-PA from critical patients admitted to 35 intensive care units (ICUs) of grade two or above were collected from the Anhui Antimicrobial Resistance Investigation Net (AHARIN) program from September 2012 to September 2015, while the minimal inhibitory concentrations (MIC) of colistin were determined by the E-test...
May 2017: Zhonghua Wei Zhong Bing Ji Jiu Yi Xue
https://www.readbyqxmd.com/read/28523838/an-unsaturated-quinolone-n-oxide-of-pseudomonas-aeruginosa-modulates-growth-and-virulence-of-staphylococcus-aureus
#12
Dávid Szamosvári, Thomas Böttcher
The pathogen Pseudomonas aeruginosa produces over 50 different quinolones, 16 of which belong to the class of 2-alkyl-4-quinolone N-oxides (AQNOs) with various chain lengths and degrees of saturation. We present the first synthesis of a previously proposed unsaturated compound that is confirmed to be present in culture extracts of P. aeruginosa, and its structure is shown to be trans-Δ(1) -2-(non-1-enyl)-4-quinolone N-oxide. This compound is the most active agent against S.  aureus, including MRSA strains, by more than one order of magnitude whereas its cis isomer is inactive...
May 19, 2017: Angewandte Chemie
https://www.readbyqxmd.com/read/28523373/role-of-sod-gene-in-response-to-static-magnetic-fields-in-pseudomonas-aeruginosa
#13
Raouia Hanini, Abdelwaheb Chatti, Selma Ben Ghorbel, Ahmed Landoulsi
The protective role of superoxide dismutase (SOD) against non-ionizing radiation such as static electromagnetic field (200 mT) has been studied in wild-type and mutant strain of Pseudomonas aeruginosa lacking cytosolic Mn-SOD (sodM), Fe-SOD (sodB), or both SODs (sodMB). Our results showed that inactivation of sodM and/or sodB genes increases the sensitivity of P. aeruginosa toward stress induced by the static magnetic field (200 mT). Furthermore, our results showed an enhancement of SOD, catalase, and peroxidases after exposure to the magnetic field...
May 18, 2017: Current Microbiology
https://www.readbyqxmd.com/read/28522994/new-potent-membrane-targeting-antibacterial-peptides-from-viral-capsid-proteins
#14
Susana A Dias, João M Freire, Clara Pérez-Peinado, Marco M Domingues, Diana Gaspar, Nuno Vale, Paula Gomes, David Andreu, Sónia T Henriques, Miguel A R B Castanho, Ana S Veiga
The increasing prevalence of multidrug-resistant bacteria urges the development of new antibacterial agents. With a broad spectrum activity, antimicrobial peptides have been considered potential antibacterial drug leads. Using bioinformatic tools we have previously shown that viral structural proteins are a rich source for new bioactive peptide sequences, namely antimicrobial and cell-penetrating peptides. Here, we test the efficacy and mechanism of action of the most promising peptides among those previously identified against both Gram-positive and Gram-negative bacteria...
2017: Frontiers in Microbiology
https://www.readbyqxmd.com/read/28522850/pseudomonas-aeruginosa-exolysin-promotes-bacterial-growth-in-lungs-alveolar-damage-and-bacterial-dissemination
#15
Stéphanie Bouillot, Patrick Munro, Benoit Gallet, Emeline Reboud, François Cretin, Guillaume Golovkine, Guy Schoehn, Ina Attrée, Emmanuel Lemichez, Philippe Huber
Exolysin (ExlA) is a recently-identified pore-forming toxin secreted by a subset of Pseudomonas aeruginosa strains identified worldwide and devoid of Type III secretion system (T3SS), a major virulence factor. Here, we characterized at the ultrastructural level the lesions caused by an ExlA-secreting strain, CLJ1, in mouse infected lungs. CLJ1 induced necrotic lesions in pneumocytes and endothelial cells, resulting in alveolo-vascular barrier breakdown. Ectopic expression of ExlA in an exlA-negative strain induced similar tissue injuries...
May 18, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28522446/non-contact-electromagnetic-induction-heating-for-eradicating-bacteria-and-yeasts-on-biomaterials-and-possible-relevance-to-orthopaedic-implant-infections-in-vitro-findings
#16
B G Pijls, I M J G Sanders, E J Kuijper, R G H H Nelissen
OBJECTIVES: Infection of implants is a major problem in elective and trauma surgery. Heating is an effective way to reduce the bacterial load in food preparation, and studies on hyperthermia treatment for cancer have shown that it is possible to heat metal objects with pulsed electromagnetic fields selectively (PEMF), also known as induction heating. We therefore set out to answer the following research question: is non-contact induction heating of metallic implants effective in reducing bacterial load in vitro? METHODS: Titanium alloy cylinders (Ti6Al4V) were exposed to PEMF from an induction heater with maximum 2000 watts at 27 kHz after being contaminated with five different types of micro-organisms: Staphylococcus epidermidis; Staphylococcus aureus; Pseudomonas aeruginosa; spore-forming Bacillus cereus; and yeast Candida albicans...
May 2017: Bone & Joint Research
https://www.readbyqxmd.com/read/28521545/silver-oxynitrate-an-efficacious-compound-for-the-prevention-and-eradication-of-dual-species-biofilms
#17
Joe A Lemire, Lindsay Kalan, Natalie Gugala, Alexandru Bradu, Raymond J Turner
Preventing and eradicating biofilms remains a challenge in clinical and industrial settings. Recently, the present authors demonstrated that silver oxynitrate (Ag7NO11) prevented and eradicated single-species planktonic and biofilm populations of numerous microbes at lower concentrations than other silver (Ag) compounds. Here, the antimicrobial and anti-biofilm efficacy of Ag7NO11 is elaborated by testing its in vitro activity against combinations of dual-species, planktonic and biofilm populations of Escherichia coli, Staphylococcus aureus and Pseudomonas aeruginosa...
May 19, 2017: Biofouling
https://www.readbyqxmd.com/read/28520867/activity-of-ceftolozane-tazobactam-against-surveillance-and-problem-enterobacteriaceae-pseudomonas-aeruginosa-and-non-fermenters-from-the-british-isles
#18
David M Livermore, Shazad Mushtaq, Daniele Meunier, Katie L Hopkins, Robert Hill, Rachael Adkin, Aiysha Chaudhry, Rachel Pike, Peter Staves, Neil Woodford
Background: We assessed the activity of ceftolozane/tazobactam against consecutive isolates collected in the BSAC Bacteraemia Surveillance from 2011 to 2015 and against 'problem' isolates sent to the UK national reference laboratory from July 2015, when routine testing began. Methods: Susceptibility testing was by BSAC agar dilution with resistance mechanisms identified by PCR and interpretive reading. Results: Data were reviewed for 6080 BSAC surveillance isolates and 5473 referred organisms...
May 16, 2017: Journal of Antimicrobial Chemotherapy
https://www.readbyqxmd.com/read/28520856/control-of-multidrug-resistant-pseudomonas-aeruginosa-in-allogeneic-hematopoietic-stem-cell-transplant-recipients-by-a-novel-bundle-including-remodeling-of-sanitary-and-water-supply-systems
#19
A Kossow, S Kampmeier, S Willems, W E Berdel, A H Groll, B Burckhardt, Rossig C, C Groth, E A Idelevich, F Kipp, A Mellmann, M Stelljes
Background.: Infections by multidrug-resistant Pseudomonas aeruginosa (MDRPa) are an important cause of morbidity and mortality in patients after allogeneic hematopoietic stem cell transplantation (HSCT). Humid environments can serve as a reservoir and source of infection by this pathogen. To minimize the risk of infection from these reservoirs, we performed extensive remodeling of sanitation and water installations as the focus of our hygiene bundle. Methods.: During the reconstruction of our transplantation unit (April 2011- April 2014) we implemented several technical modifications to reduce environmental contamination by and subsequent spreading of MDRPa, including a newly designed shower drain, disinfecting siphons underneath the sinks, and rimless toilets...
May 18, 2017: Clinical Infectious Diseases: An Official Publication of the Infectious Diseases Society of America
https://www.readbyqxmd.com/read/28520604/in-vitro-evaluation-of-betafoam-a-new-polyurethane-foam-dressing
#20
Jae-A Jung, Seung-Kyu Han, Seong-Ho Jeong, Eun-Sang Dhong, Kang-Gyun Park, Woo-Kyung Kim
BACKGROUND: A new polyurethane foam dressing impregnated with 3% povidone-iodine (Betafoam; Genewell, Seoul, Korea) was recently developed based on the hypothesis that its physical properties, including improved moisture-retention capacity and antimicrobial activity, are at least as good as those achieved with the current foam dressings that contain silver, but also associated with reduced cost and cytotoxicity to host cells. The purpose of this in vitro study was to evaluate the efficacy of Betafoam by comparing its physical properties, antimicrobial activity, and cytotoxicity with those of 3 silver foam dressings (Allevyn-Ag [Smith & Nephew, Hull, United Kingdom]; Mepilex-Ag [Mölnlycke Health Care, Gothenburg, Sweden]; and PolyMem-Ag [Ferris MFG Corp, Burr Ridge, Illinois]) used worldwide...
June 2017: Advances in Skin & Wound Care
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