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Pravin Patil, Bhupendra Mishra, Gitanjali Sheombarsing, Katarzyna Kurpiewska, Justyna Kalinowska-Tłuścik, Alexander Dömling
Recently made accessible α-aminomethyl tetrazoles are excellent starting materials for a further Ugi MCR of high diversity, yielding substituted N-methyl-2-(((1-methyl-1H-tetrazol-5-yl)methyl)amino)acetamides in a library-2-library approach. In detail, we report scope and limitations of the 2-step reaction sequence based on >50 reactions. The target scaffold has four points of diversity and will find applications to fill screening decks for HTS and in structure-based drug design.
December 7, 2017: ACS Combinatorial Science
Sabine Delannoy, Laetitia Le Devendec, Eric Jouy, Patrick Fach, Djamel Drider, Isabelle Kempf
We studied a collection of 79 colistin-resistant Escherichia coli isolates isolated from diseased pigs in France between 2009 and 2013. We determined a number of phenotypic and genetic characters using broth microdilution to characterize their antimicrobial susceptibility. We performed pulse field gel electrophoresis (PFGE) to assess their genetic diversity and assign them to phylogroups. High-throughput real-time PCR micro-array was used to screen for a selection of genetic markers of virulence, and PCR and sequencing of the main recognized resistance genes allowed us to investigate the mechanisms of colistin resistance...
2017: Frontiers in Microbiology
Xiaoming Wang, Weishuai Zhai, Jiyun Li, Dejun Liu, Qidi Zhang, Zhangqi Shen, Shaolin Wang, Yang Wang
The rapid rise and dissemination of MDR bacteria is a major threat to public health worldwide, and has narrowed the treatment options for infections caused by these bacteria (1).….
December 4, 2017: Antimicrobial Agents and Chemotherapy
Ruichao Li, Hua Yu, Miaomiao Xie, Kaichao Chen, Ning Dong, Dachuan Lin, Edward Wai-Chi Chan, Sheng Chen
Compared to plasmid-bearing mcr-1, the occurrence of chromosomally-encoded mcr-1 was rare although it has been reported in several cases. This study aims to investigate the genetic features of chromosomally-encoded mcr-1 among E. coli strains and potential genetic basis governing the mobilization of mcr-1 in bacterial chromosomes. The genome sequences of 16 E. coli strains containing a chromosomal mcr-1 gene were obtained and analyzed. Phylogenetic and WGS (Whole Genome Sequencing) analysis demonstrated that mcr-1 was associated with four major types of genetic arrangements, namely ISApl1-mcr1-orf, Tn6330, complex Tn6330 and ΔTn6330 in chromosomes of genetically unrelated E...
November 29, 2017: International Journal of Antimicrobial Agents
Foteini E Kakaroni, Alexandra Collet, Eirini Sakellari, Demetrios I Tzimopoulos, Milosz Siczek, Tadeusz Lis, Mark Murrie, Constantinos J Milios
The solvothermal reaction between Cr(acac)3, MCl2·6H2O (M = Ni, Co) and 2-hydroxy-4-methyl-6-phenyl-pyridine-3-amidoxime (H2L), under basic conditions, led to the synthesis of the heterometallic heptanuclear clusters [MCr(HLzw)6(HL)6]·3Cl (M = Ni, 1; Co, 2), with the nickel analogue displaying an S = 9/2 spin ground-state.
November 29, 2017: Dalton Transactions: An International Journal of Inorganic Chemistry
Marisa Haenni, Racha Beyrouthy, Agnese Lupo, Pierre Châtre, Jean-Yves Madec, Richard Bonnet
No abstract text is available yet for this article.
November 22, 2017: Journal of Antimicrobial Chemotherapy
Cristina Garcia-Graells, Sigrid C J De Keersmaecker, Kevin Vanneste, Brigitte Pochet, Katie Vermeersch, Nancy Roosens, Katelijne Dierick, Nadine Botteldoorn
A collection of 105 colistin-resistant Salmonella isolates collected from 2012 to 2015 in the national surveillance program in Belgium was screened by PCR for the presence of genes mcr-1 and mcr-2. Of these, 1.90% (2/105) and 0.95% (1/105) tested positive for mcr-1 and mcr-2, respectively. The presence of the mcr-1 or mcr-2 determinant has been confirmed by whole genome sequencing and allowed the localization of these two genes on IncX4 type plasmids. We report here the presence of mcr-1 and the first mcr-2 gene in Salmonella ever isolated in the Belgian food chain...
November 28, 2017: Foodborne Pathogens and Disease
Manuela Tietgen, Torsten Semmler, Sara Riedel-Christ, Volkhard A J Kempf, Antonio Molinaro, Christa Ewers, Stephan Göttig
A Klebsiella pneumoniae isolate harbouring a 217 kb IncHI2-type plasmid, termed pKP2442, encoding the colistin resistance gene mcr-1 was isolated from a leukaemia patient. pKP2442 was mobilized by intra- and intergenus transconjugation from the clinical isolate to E. coli J53 (transconjugation frequency: 6.86 x 10-8 ± 5.57 x 10-8) and K. pneumoniae PRZ (4.04 x 10-8 ± 3.03 x 10-8), respectively. Since acquisition of resistance determinants often results in a loss of fitness, the impact of mcr-1 on fitness of E...
November 24, 2017: International Journal of Antimicrobial Agents
Agata Turlej-Rogacka, Basil Britto Xavier, Lore Janssens, Christine Lammens, Olympia Zarkotou, Spyros Pournaras, Herman Goossens, Surbhi Malhotra-Kumar
Susceptibility testing for colistin remains challenging primarily due to its inherent properties. We evaluated colistin stability in agar and reproducibility of colistin MICs obtained by agar dilution, broth macro- and micro-dilution and MIC gradient strips on 3-7 iterations of each method using clinical Klebsiella pneumoniae (susceptible-CS, and resistant-CR, n = 2 each), mcr-harboring Escherichia coli (n = 2), and reference strains E. coli ATCC25922 and Pseudomonas aeruginosa ATCC27853. MICs for reference strains were not in the given range using Etest and broth microdilution (ATCC25922, 0...
November 25, 2017: European Journal of Clinical Microbiology & Infectious Diseases
Mariasofia Caltagirone, Elisabetta Nucleo, Melissa Spalla, Francesca Zara, Federica Novazzi, Vittoria M Marchetti, Aurora Piazza, Ibrahim Bitar, Marica De Cicco, Stefania Paolucci, Giorgio Pilla, Roberta Migliavacca, Laura Pagani
To evaluate the water compartment antibiotic-resistance contamination rates, 11 wells, five streams, and four treatment plants located in the Oltrepò Pavese area were screened for the presence of third generation cephalosporins resistant Gram-negative bacteria. Enterobacteriaceae were also characterized for the Extended-Spectrum-β-Lactamases (ESBLs), carbapenemases, and mcr-1 genes presence. From December 2014 to November 2015, 246 water samples were filtered, plated on Plate Count Agar, MacConkey Agar, and MacConkey Agar with cefotaxime...
2017: Frontiers in Microbiology
Tanise Vendruscolo Dalmolin, Andreza Francisco Martins, Alexandre Prehn Zavascki, Daiana de Lima-Morales, Afonso Luís Barth
We identified one clinical isolate of K. pneumoniae harboring the mcr 1 (plasmid of IncX4 family) and blaKPC-2 (plasmid of IncFIB family) genes in southern Brazil. These findings highlight that K. pneumoniae isolates carrying both mcr-1 and blaKPC-2 may emergence as a serious threat to antimicrobial therapy.
October 5, 2017: Diagnostic Microbiology and Infectious Disease
Lucie Bardet, Stéphanie Le Page, Thongpan Leangapichart, Jean-Marc Rolain
BACKGROUND: Multi-drug resistant bacteria are a phenomenon which is on the increase around the world, particularly with the emergence of colistin-resistant Enterobacteriaceae and vancomycin-resistant enterococci strains. The recent discovery of a plasmid-mediated colistin resistance with the description of the transferable mcr-1 gene raised concerns about the need for an efficient detection method for these pathogens, to isolate infected patients as early as possible. The LBJMR medium was developed to screen for all polymyxin-resistant Gram-negative bacteria, including mcr-1 positive isolates, and vancomycin-resistant Gram-positive bacteria...
November 23, 2017: BMC Microbiology
Emmeli F R Mikkelsen, Christian Østergaard Mariager, Thomas Nørlinger, Haiyun Qi, Rolf F Schulte, Steen Jakobsen, Jørgen Frøkiær, Michael Pedersen, Hans Stødkilde-Jørgensen, Christoffer Laustsen
(11)C-acetate is a positron emission tomography (PET) tracer of oxidative metabolism, whereas hyperpolarized (13)C-acetate can be used in magnetic resonance imaging (MRI) for investigating specific metabolic processes. The aims of this study were to examine if the kinetic formalism of (11)C-acetate PET in the kidneys is comparable to that of (13)C-acetate MRI, and to compare the dynamic metabolic information of hyperpolarized (13)C-acetate MRI with that obtained with (11)C-acetate PET. Rats were examined with dynamic hyperpolarized (13)C-acetate MRI or (11)C-acetate PET before and after intravenous injection of furosemide, a loop diuretic known to alter both the hemodynamics and oxygen consumption in the kidney...
November 22, 2017: Scientific Reports
Deborah E Crawford, Clodagh K Miskimmin, John Cahir, S L James
Chemical manufacturing typically requires more than one step, involving multiple batch processes, which makes synthesis at scale laborious and wasteful. Herein, we demonstrate that several reactions can be telescoped into a single continuous process and/or be carried out as a continuous multi-component reaction (MCR), by twin screw extrusion (TSE), in the complete absence of solvent.
November 22, 2017: Chemical Communications: Chem Comm
Jiyun Li, Xiaomin Shi, Wenjuan Yin, Yang Wang, Zhangqi Shen, Shuangyang Ding, Shaolin Wang
The aim of the study was to develop a multiplex assay for rapid detection of mcr-1, mcr-2, and mcr-3, a group of genes of conferring resistance to colistin mediated by plasmid in Enterobacteriaceae. A SYBR Green based real-time PCR assay has been designed to detect the mcr genes, and applied to cultured bacteria, feces and soil samples. All three mcr genes could be detected with a lower limit of 10(2) cultured bacteria. This test was highly specific and sensitive, and generated no false-positive results. The assay was also conclusive when applied to feces and soil samples containing mcr-1-positive Escherichia coli, which could facilitate the screening of mcr genes not only in the bacteria, but also directly from the environment...
2017: Frontiers in Microbiology
Flavia Rossi, Raquel Girardello, Carlos Morais, Ana Paula Cury, Layla Farage Martins, Aline Maria da Silva, Edson Abdala, João Carlos Setubal, Alberto José da Silva Duarte
OBJECTIVE: We describe an IncX4 pHC891/16mcr plasmid carrying mcr-1 in a colistin-resistant and carbapenem-susceptible E. coli isolate (HC891/16), ST156, which caused a blood infection in a Brazilian patient with gallbladder adenocarcinoma. METHODS: Strain HC891/16 was subjected to whole genome sequencing using the MiSeq Platform (Illumina, Inc., USA). Assembly was performed using Mira and ABACAS. RESULTS: The isolates showed resistance only to ciprofloxacin, ampicillin and cefoxitin, and whole-genome sequencing revealed the presence of aac(6')Ib-cr and blaTEM1...
October 2017: Clinics
Lavinia Gambelli, Simon Guerrero-Cruz, Rob J Mesman, Geert Cremers, Mike S M Jetten, Huub J M Op den Camp, Boran Kartal, Claudia Lueke, Laura van Niftrik
Methane is a very potent greenhouse gas and can be oxidized aerobically or anaerobically through microbial-mediated processes, thus decreasing methane emissions to the atmosphere. Using a complementary array of methods including phylogenetic analysis, physiological experiments, and light and electron microscopy techniques (including electron tomography), we investigated the community composition and ultrastructure of a continuous bioreactor enrichment culture, in which anaerobic methane oxidation (AOM) was coupled to nitrate reduction...
November 17, 2017: Applied and Environmental Microbiology
Nicolas Kieffer, Marta Aires-de-Sousa, Patrice Nordmann, Laurent Poirel
The mcr-1 (mobile colistin resistance 1) gene, which encodes phosphoethanolamine transferase, has been recently identified as a source of acquired resistance to polymyxins in Escherichia coli. Using the SuperPolymyxin selective medium, we prospectively screened 100 pigs at 2 farms in Portugal for polymyxin-resistant Enterobacteriaceae and recovered 98 plasmid-mediated MCR-1-producing isolates. Most isolates corresponded to nonclonally related E. coli belonging to many sequence types; we also found 2 Klebsiella pneumoniae sequence types...
December 2017: Emerging Infectious Diseases
Laurent Poirel, Yu Larpin, Jan Dobias, Roger Stephan, Jean-Winoc Decousser, Jean-Yves Madec, Patrice Nordmann
The Rapid Polymyxin NP test has been recently developed to rapidly detect polymyxin resistance in Enterobacteriaceae. Here we evaluated this test for detecting MCR-1/MCR-2-producing Enterobacteriaceae using a collection of 70 non-redundant strains either recovered from the environment, animals, or humans. Sensitivity and specificity were found to be 100%.
September 22, 2017: Diagnostic Microbiology and Infectious Disease
Thuy Chu-Van, Zoran Ristovski, Ali Mohammad Pourkhesalian, Thomas Rainey, Vikram Garaniya, Rouzbeh Abbassi, Sanaz Jahangiri, Hossein Enshaei, U-Shen Kam, Richard Kimball, Liping Yang, Ali Zare, Harry Bartlett, Richard J Brown
This study investigated particle and gaseous emission factors from a large cargo vessel for her whole voyage including at berth, manoeuvring and cruising. Quantification of these factors assists in minimising the uncertainty in the current methods of exhaust gas emission factor estimation. Engine performance and emissions from the main marine engine were measured on-board while the ship was manoeuvring and cruising at sea. Emissions of an auxiliary engine working at 55% of maximum continuous rating (MCR) were measured when the ship was at actual harbour stopovers...
November 13, 2017: Environmental Pollution
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