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https://www.readbyqxmd.com/read/29156685/whole-genome-and-transcriptome-analysis-reveal-maldi-tof-ms-and-sds-page-have-limited-performance-for-the-detection-of-the-key-outer-membrane-protein-in-carbapenem-resistant-klebsiella-pneumoniae-isolates
#1
Naina Adren Pinto, Roshan D'Souza, In Sik Hwang, Jongrak Choi, Yong Ha In, Hyung Soon Park, Choong-Min Ryu, Dongeun Yong, Kyungwon Lee
To detect the outer membrane protein (OMP), which plays a key role in carbapenem resistance, whole-genome and transcriptome analysis of the clinical carbapenem-resistant Klebsiella pneumoniae was carried out. The index strain lacked both OmpK35 and OmpK36, whereas the other strains lacked only OmpK35. After SDS-PAGE, the putative OMP bands were excised and identified as OmpA and OmpK36. MALDI-TOF MS showed peaks at ∼36 and ∼38 kDa that corresponded to OmpA and OmpK36, respectively. In all the strains except YMC2014/03/P345, the ∼38 kDa peaks were present...
October 17, 2017: Oncotarget
https://www.readbyqxmd.com/read/29155052/characterization-of-covalent-modifications-of-hdl-apoproteins-by-endogenous-oxidized-phospholipids
#2
Detao Gao, Eugene A Podrez
High density lipoprotein (HDL) is cardioprotective, unless it is pathologically modified under oxidative stress. Covalent modifications of lipid-free apoA-I, the most abundant apoprotein in HDL, compromise its atheroprotective functions. HDL is enriched in oxidized phospholipids (oxPL) in vivo in oxidative stress. Furthermore, oxidized phospholipids can covalently modify HDL apoproteins. We have now carried out a systematic analysis of modifications of HDL apoproteins by endogenous oxPL. Human HDL or plasma were oxidized using a physiologically relevant MPO-H2O2-NO2(-) system or AIPH, or were exposed to synthetic oxPL...
November 15, 2017: Free Radical Biology & Medicine
https://www.readbyqxmd.com/read/29151823/proteomic-changes-between-populus-allotriploids-and-diploids-revealed-using-an-itraq-based-quantitative-approach
#3
Yi Wang, Yun Li, Yujing Suo, Yu Min, Xiangyang Kang
Background: Polyploid breeding is a powerful approach for Populus genetic improve-ment because polyploid trees have valuable characteristics, including better timber quality and a higher degree of stress resistance compared with their full-sib diploids. However, the genetic mech-anism underlying this phenomenon remains unknown. Objective: To better understand the proteomic changes between Populus allotriploids and diploids, we examined the proteomic profiles of allotriploid and diploid Populus by iTRAQ labeling coupled with two-dimensional liquid chromatography and MALDI-TOF/TOF mass spectrometry (MS)...
September 2017: Current Proteomics
https://www.readbyqxmd.com/read/29146249/composition-of-lactic-acid-bacteria-during-spontaneous-curly-kale-brassica-oleracea-var-sabellica-fermentation
#4
Magdalena Michalak, Klaudia Gustaw, Adam Waśko, Magdalena Polak-Berecka
The present work is the first report on spontaneous fermentation of curly kale and characteristics of autochthonous lactic acid bacteria (LAB). Our results indicate that curly kale fermentation is the new possibility of the technological use of this vegetable. Bacteria representing ten different species were isolated from three phases of curly kale fermentation and identified by MALDI-TOF mass spectrometry and 16S rRNA gene sequencing. Among them, four species were identified as Lactobacillus spp. (Lb. plantarum 332, Lb...
January 2018: Microbiological Research
https://www.readbyqxmd.com/read/29137652/characterization-of-streptococcus-pneumoniae-isolates-from-austrian-companion-animals-and-horses
#5
Maximilian Ginders, Michael Leschnik, Frank Künzel, Doris Kampner, Claudia Mikula, Georg Steindl, Inga Eichhorn, Andrea T Feßler, Stefan Schwarz, Joachim Spergser, Igor Loncaric
BACKGROUND: The aim of the present study was to investigate the genetic relatedness and the antimicrobial resistance profiles of a collection of Austrian Streptococcus pneumoniae isolates from companion animals and horses. A total of 12 non-repetitive isolates presumptively identified as S. pneumoniae were obtained during routinely diagnostic activities between March 2009 and January 2017. RESULTS: Isolates were confirmed as S. pneumoniae by bile solubility and optochin susceptibility testing, matrix-assisted laser desorption-ionization-time of flight (MALDI-TOF) mass spectrometry and sequence analysis of a part recA and the 16S rRNA genes...
November 14, 2017: Acta Veterinaria Scandinavica
https://www.readbyqxmd.com/read/29112122/identification-and-antimicrobial-susceptibility-testing-of-anaerobic-bacteria-rubik-s-cube-of-clinical-microbiology
#6
REVIEW
Márió Gajdács, Gabriella Spengler, Edit Urbán
Anaerobic bacteria have pivotal roles in the microbiota of humans and they are significant infectious agents involved in many pathological processes, both in immunocompetent and immunocompromised individuals. Their isolation, cultivation and correct identification differs significantly from the workup of aerobic species, although the use of new technologies (e.g., matrix-assisted laser desorption/ionization time-of-flight mass spectrometry, whole genome sequencing) changed anaerobic diagnostics dramatically...
November 7, 2017: Antibiotics
https://www.readbyqxmd.com/read/29108275/functional-imaging-in-combination-with-mutation-status-aids-prediction-of-response-to-inhibiting-b-cell-receptor-signaling-in-lymphoma
#7
Laura Jacobs, Stefan Habringer, Jolanta Slawska, Katharina Huber, Elke Hauf, Zhoulei Li, Yosef Refaeli, Markus Schwaiger, Martina Rudelius, Axel Walch, Ulrich Keller
Aberrant B-cell receptor (BCR) signaling is known to contribute to malignant transformation. Two small molecule inhibitors targeting BCR pathway signaling include ibrutinib, a Bruton's tyrosine kinase (BTK) inhibitor, and idelalisib, a specific Phosphatidylinositol-4,5-bisphosphate 3-kinase delta (PI3Kδ) inhibitor, both of which have been approved for use in haematological malignancies. Despite the identification of various diffuse large B-cell lymphoma (DLBCL) subtypes, mutation status alone is not sufficient to predict patient response and therapeutic resistance can arise...
October 3, 2017: Oncotarget
https://www.readbyqxmd.com/read/29105571/accuracy-of-pcr-targeting-different-markers-for-staphylococcus-aureus-identification-a-comparative-study-using-matrix-assisted-laser-desorption-ionization-time-of-flight-mass-spectrometry-as-the-gold-standard
#8
Mauro M Saraiva, Candice M De Leon, Silvana C Santos, Danilo T Stipp, Miliane M Souza, Lauro Santos Filho, Wondwossen A Gebreyes, Celso J Oliveira
Staphylococcus aureus is considered a major pathogen in veterinary and human medicine, and the emergence of multidrug-resistant strains, such as livestock-associated methicillin-resistant S. aureus, means that reliable, inexpensive, and fast methods are required to identify S. aureus obtained from animal sources. We tested the accuracy of a PCR targeting the genes femA, nuc, and coa in identifying S. aureus from animals. A total of 157 Staphylococcus spp. isolates were examined by matrix-assisted laser desorption/ionization time-of-flight (MALDI-TOF) mass spectrometry; 18 different Staphylococcus species were identified...
November 1, 2017: Journal of Veterinary Diagnostic Investigation
https://www.readbyqxmd.com/read/29102775/blandm-1-producing-multidrug-resistant-escherichia-coli-isolated-from-a-companion-dog-in-china
#9
Lanqing Cui, Lei Lei, Yuan Lv, Rongmin Zhang, Xiaoyu Liu, Mei Li, Fan Zhang, Yang Wang
OBJECTIVES: This sudy aimed to characterize a blaNDM-1-producing Escherichia coli from a companion dog. METHODS: This strain was isolated from a surveillance study of carbapenem-resistant Gram-negative bacteria and the specie was identified by API 20E system and MALDI-TOF MS. MICs of various antimicrobial agents were determined by agar dilution. Multilocus sequence typing (MLST) and various carbapenemase genes including blaNDM, blaIMP, blaVIM, blaSME, blaIMI, blaKPC, blaGES, blaSPM, blaGIM, blaNMC, blaDIM, blaSIM, blaOXA-23, blaOXA-24, blaOXA-48, blaOXA-51 and blaOXA-58 were screened by PCR...
November 1, 2017: Journal of Global Antimicrobial Resistance
https://www.readbyqxmd.com/read/29101081/molecular-characterization-of-multidrug-resistant-bacteroides-isolates-from-hungarian-clinical-samples
#10
Károly Péter Sárvári, József Sóki, Katalin Kristóf, Emese Juhász, Cecilia Miszti, Szilvia Zsóka Melegh, Krisztina Latkóczy, Edit Urbán
INTRODUCTION: Members of the Bacteroides fragilis group are the most important components of the normal human gut microbiota, but these bacteria can cause severe infections as well. Due to the frequent usage of antibiotics, the spreading of the MDR strains is a real threat worldwide. MATERIALS AND METHODS: In a multicentre study 400 Bacteroides isolates from five Hungarian microbiological laboratories were cultured and identified by MALDI TOF-MS. The MIC values of ten antibiotics were determined by the agar dilution method and evaluated by the breakpoints of EUCAST or CLSI...
October 31, 2017: Journal of Global Antimicrobial Resistance
https://www.readbyqxmd.com/read/29091187/quantitative-and-automated-maldi-tof-ms-based-detection-of-the-plasmid-mediated-quinolone-resistance-determinant-aac-6-ib-cr-in-enterobacteriaceae
#11
Marina Oviaño, Marta Gómara, Maria José Barba, Katrin Sparbier, Álvaro Pascual, Germán Bou
No abstract text is available yet for this article.
October 1, 2017: Journal of Antimicrobial Chemotherapy
https://www.readbyqxmd.com/read/29090643/identification-through-maldi-tof-mass-spectrometry-and-antimicrobial-susceptibility-profiling-of-bacterial-pathogens-isolated-from-sow-urinary-tract-infection
#12
Luisa Z Moreno, Carlos E C Matajira, Andre P Poor, Renan E Mesquita, Vasco T M Gomes, Ana Paula S Silva, Cristina R Amigo, Ana Paula G Christ, Mikaela R F Barbosa, Maria Inês Z Sato, Andrea M Moreno
BACKGROUND: Urinary tract infection (UTI) is a common disease in sows due to intensification of pig production. Despite direct economic losses, UTI prevalence and respective microbial identification are still poorly studied. OBJECTIVE: The aims of this study were to identify the causative agents of UTI in sows through MALDI-TOF mass spectrometry and to characterize their respective antimicrobial resistance profiles. MATERIALS AND METHODS: Urine samples from 300 sows of three swine herds from São Paulo State (Brazil) were screened for UTI; suggestive samples were submitted to bacterial isolation...
November 1, 2017: Veterinary Quarterly
https://www.readbyqxmd.com/read/29080625/diversity-of-livestock-associated-methicillin-resistant-staphylococcus-aureus
#13
Henok A Tegegne, Ivana Koláčková, Renata Karpíšková
OBJECTIVE: To evaluate the diversity and molecular characteristics of livestock associated methicillin-resistant Staphylococcus aureus in livestock animals, food of animal origin and the environment in the Czech Republic. METHODS: After having been primarily enriched in buffered peptone water, the samples were cultured on Baird-Parker agar. Presumptive colonies were sub-cultured to blood agar and assessed morphologically. Furthermore, presumptive Staphylococcus aureus colonies were confirmed by MALDI-TOF...
September 2017: Asian Pacific Journal of Tropical Medicine
https://www.readbyqxmd.com/read/29079752/transition-of-colistin-dependence-into-colistin-resistance-in-acinetobacter-baumannii
#14
Ji-Young Lee, Eun Seon Chung, Kwan Soo Ko
We recently demonstrated a high rate of colistin dependence in Acinetobacter baumannii isolates exposed to colistin in vitro. In the present study, we obtained a colistin-resistant (H08-391R) and colistin-dependent mutant (H08-391D) from a colistin-susceptible parental strain (H08-391). We found that the colistin-dependent mutant converted into a stable colistin-resistant mutant (H08-391D-R) in vitro after four serial passages without colistin. H08-391D and H08-391D-R were both found to harbor defective lipid A, as indicated by matrix-assisted laser desorption ionization-time of flight (MALDI-TOF) mass spectrometry analysis...
October 27, 2017: Scientific Reports
https://www.readbyqxmd.com/read/29079617/staphylococcus-edaphicus-sp-nov-isolated-in-antarctica-harbours-mecc-gene-and-genomic-islands-with-suspected-role-in-adaptation-to-extreme-environment
#15
Roman Pantůček, Ivo Sedláček, Adéla Indráková, Veronika Vrbovská, Ivana Mašlaňová, Vojtěch Kovařovic, Pavel Švec, Stanislava Králová, Lucie Krištofová, Jana Kekláková, Petr Petráš, Jiří Doškař
Two Gram-stain-positive, coagulase-negative staphylococcal strains were isolated from abiotic sources, stone fragments and sandy soil in James Ross Island, Antarctica. Here we describe properties of novel species of the genus Staphylococcus that has near identical 16S rRNA gene sequence to Staphylococcus saprophyticus However, compared to S. saprophyticus and the next closest relatives, the new species demonstrates considerable phylogenetic distance at whole genome level, average nucleotide identity <85 %, and inferred DNA-DNA hybridization <30%...
October 27, 2017: Applied and Environmental Microbiology
https://www.readbyqxmd.com/read/29079147/rapid-detection-of-antibiotic-resistance-by-maldi-tof-mass-spectrometry-using-a-novel-direct-on-target-microdroplet-growth-assay
#16
Evgeny A Idelevich, Katrin Sparbier, Markus Kostrzewa, Karsten Becker
OBJECTIVES: We aimed to develop a universal phenotypic method, which allows easy and rapid antimicrobial susceptibility testing independently of underlying resistance mechanism. METHODS: We established a novel direct-on-target microdroplet growth assay for the detection of antibiotic resistance within a few hours, which is based on matrix-assisted laser desorption/ionization time-of-flight mass spectrometry (MALDI-TOF MS). The microorganisms were incubated with and without meropenem in nutrient broth as microdroplets directly on MALDI-TOF MS target...
October 24, 2017: Clinical Microbiology and Infection
https://www.readbyqxmd.com/read/29063880/discriminatory-power-of-three-typing-techniques-in-determining-relatedness-of-nosocomial-klebsiella-pneumoniae-isolates-from-a-tertiary-hospital-in-india
#17
Swathi Purighalla, Sarita Esakimuthu, Mallika Reddy, George K Varghese, Vijay S Richard, Vasan K Sambandamurthy
PURPOSE: The purpose of this study was to evaluate the discriminatory power of two DNA-based technique and a protein-based technique for the typing of nosocomial isolates of Klebsiella pneumoniae. A second objective was to determine the antimicrobial susceptibility pattern and characterise the presence of genes encoding extended-spectrum beta-lactamases (ESBLs) and carbapenemases. MATERIALS AND METHODS: Forty-six K. pneumoniae isolates from patients with bloodstream infections at a tertiary care hospital in India between December 2014 and December 2015 were studied...
July 2017: Indian Journal of Medical Microbiology
https://www.readbyqxmd.com/read/29063630/isolation-and-characterization-of-multi-drug-resistant-leclercia-species-from-animal-clinical-case
#18
Mamta Choudhary, Binod Kumar Choudhary, Smita Bhoyar, Satyajit B Kale, S P Chaudhari, B C Bera, Ashok Jain, S B Barbuddhe
Leclercia adecarboxylata, a Gram-negative bacillus of family Enterobacteriaceae, is an uncommonly identified pathogen isolated from environmental and clinical specimens. Most of the human infections are polymicrobial and commonly occur in immunocompromised hosts, although nosocomial infections in immunocompetent hosts have been documented. Here, we describe the case of isolation of Leclercia species as polymicrobial infection from bovine suffering from respiratory distress in Chhattisgarh state of India. The isolates were identified by their phenotypes, 16S rDNA sequencing and by MALDI TOF-MS...
October 24, 2017: Letters in Applied Microbiology
https://www.readbyqxmd.com/read/29054663/characterization-of-bacterial-diversity-in-contaminated-groundwater-using-matrix-assisted-laser-desorption-ionization-time-of-flight-mass-spectrometry
#19
Misty S Martin, Inês C Santos, Doug D Carlton, Paula Stigler-Granados, Zacariah L Hildenbrand, Kevin A Schug
Groundwater is a major source for drinking water in the United States, and therefore, its quality and quantity is of extreme importance. One major concern that has emerged is the possible contamination of groundwater due to the unconventional oil and gas extraction activities. As such, the impacts of exogenous contaminants on microbial ecology is an area to be explored to understand what are the chemical and physical conditions that allow the proliferation of pathogenic bacteria and to find alternatives for water treatment by identifying organic-degrading bacteria...
October 17, 2017: Science of the Total Environment
https://www.readbyqxmd.com/read/29042339/clonal-dissemination-of-oxa-48-producing-enterobacter-cloacae-isolated-from-companion-animals-in-algeria
#20
Massilia Yousfi, Abdelaziz Touati, Anaelle Muggeo, Brazane Mira, Asma Bourouis, Lucien Brasme, Thomas Guillard, Christophe de Champs
OBJECTIVES: The aim of this study was to investigate carbapenemase-producing Enterobacteriaceae (CPE) in companion animals. METHODS: Between October 2015 and April 2016, 533 rectal swabs were obtained from healthy and diseased pets in different cities in Algeria. Samples collected were plated on MacConkey agar supplemented with ertapenem (0.5mg/L). The isolates were identified by MALDI-TOF mass spectroscopy. Antimicrobial susceptibility testing was performed using disk diffusion method...
October 14, 2017: Journal of Global Antimicrobial Resistance
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