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https://www.readbyqxmd.com/read/29671790/chemical-synthesis-and-functional-analysis-of-varva-cyclotide
#1
Claudio A Álvarez, Paula A Santana, Omar Luna, Constanza Cárdenas, Fernando Albericio, María S Romero, Fanny Guzmán
Cyclotides are circular peptides found in various plant families. A cyclized backbone, together with multiple disulfide bonds, confers the peptides’ exceptional stability against protease digestion and thermal denaturation. In addition, the features of these antimicrobial molecules make them suitable for use in animal farming, such as aquaculture. Fmoc solid phase peptide synthesis on 2-chlorotrityl chlorine (CTC) resin using the “tea-bag” approach was conducted to generate the VarvA cyclotide identified previously from Viola arvensis ...
April 19, 2018: Molecules: a Journal of Synthetic Chemistry and Natural Product Chemistry
https://www.readbyqxmd.com/read/29617332/rapid-identification-of-intact-staphylococcal-bacteriophages-using-matrix-assisted-laser-desorption-ionization-time-of-flight-mass-spectrometry
#2
Dana Štveráková, Ondrej Šedo, Martin Benešík, Zbyněk Zdráhal, Jiří Doškař, Roman Pantůček
Staphylococcus aureus is a major causative agent of infections associated with hospital environments, where antibiotic-resistant strains have emerged as a significant threat. Phage therapy could offer a safe and effective alternative to antibiotics. Phage preparations should comply with quality and safety requirements; therefore, it is important to develop efficient production control technologies. This study was conducted to develop and evaluate a rapid and reliable method for identifying staphylococcal bacteriophages, based on detecting their specific proteins using matrix-assisted laser desorption ionization time-of-flight mass spectrometry (MALDI-TOF MS) profiling that is among the suggested methods for meeting the regulations of pharmaceutical authorities...
April 4, 2018: Viruses
https://www.readbyqxmd.com/read/29608117/clinical-impact-of-rapid-bacterial-identification-by-maldi-tof-ms-combined-with-the-b%C3%A3%C2%AAta-lacta%C3%A2-test-on-early-antibiotic-adaptation-by-an-antimicrobial-stewardship-team-in-bloodstream-infections
#3
A Mizrahi, J Amzalag, C Couzigou, G Péan De Ponfilly, B Pilmis, A Le Monnier
BACKGROUND: Bloodstream infections (BSI) can potentially be life-threatening infections and are associated with a high crude mortality, moreover with an inappropriate first-line antibiotic therapy. Bacterial resistance is more and more frequently observed. New strategies of BSI management are urgently needed. MATERIALS AND METHODS: During an 18-months period, we prospectively evaluated the clinical impact of rapid bacterial identification by MALDI-TOF MS technology combined with an antimicrobial stewardship team (AST) intervention...
April 2, 2018: Infectious Diseases
https://www.readbyqxmd.com/read/29534106/a-new-scheme-for-strain-typing-of-methicillin-resistant-staphylococcus-aureus-on-the-basis-of-matrix-assisted-laser-desorption-ionization-time-of-flight-mass-spectrometry-by-using-machine-learning-approach
#4
Hsin-Yao Wang, Tzong-Yi Lee, Yi-Ju Tseng, Tsui-Ping Liu, Kai-Yao Huang, Yung-Ta Chang, Chun-Hsien Chen, Jang-Jih Lu
Methicillin-resistant Staphylococcus aureus (MRSA), one of the most important clinical pathogens, conducts an increasing number of morbidity and mortality in the world. Rapid and accurate strain typing of bacteria would facilitate epidemiological investigation and infection control in near real time. Matrix-assisted laser desorption ionization-time of flight (MALDI-TOF) mass spectrometry is a rapid and cost-effective tool for presumptive strain typing. To develop robust method for strain typing based on MALDI-TOF spectrum, machine learning (ML) is a promising algorithm for the construction of predictive model...
2018: PloS One
https://www.readbyqxmd.com/read/29451890/detection-of-bartonella-spp-in-fleas-by-maldi-tof-ms
#5
Basma El Hamzaoui, Maureen Laroche, Lionel Almeras, Jean Michel Bérenger, Didier Raoult, Philippe Parola
BACKGROUND: Matrix-Assisted Laser Desorption/Ionization Time-of-Flight Mass Spectrometry (MALDI-TOF MS) has recently emerged in the field of entomology as a promising method for the identification of arthropods and the detection of associated pathogens. METHODOLOGY/PRINCIPAL FINDINGS: An experimental model of Ctenocephalides felis (cat fleas) infected with Bartonella quintana and Bartonella henselae was developed to evaluate the efficacy of MALDI-TOF MS in distinguishing infected from uninfected fleas, and its ability to distinguish fleas infected with Bartonella quintana from fleas infected with Bartonella henselae...
February 16, 2018: PLoS Neglected Tropical Diseases
https://www.readbyqxmd.com/read/29421668/first-report-of-sporadic-cases-of-candida-auris-in-colombia
#6
Claudia M Parra-Giraldo, Sandra L Valderrama, Gloria Cortes-Fraile, Javier R Garzón, Beatriz E Ariza, Florent Morio, Melva Y Linares-Linares, Andrés Ceballos-Garzón, Alejandro de la Hoz, Catalina Hernandez, Carlos Alvarez-Moreno, Patrice Le Pape
BACKGROUND: Candida auris is a recently reported Candida species which is phenotypically similar to Candida haemulonii and related to hospital outbreaks. This organism can be misidentified as C. haemulonii, C. famata, C. catenulata or Rhodotorula glutinis by phenotypic approaches. MALDI-TOF MS and DNA sequence analysis using ITS rDNA barcoding provide an accurate identification. CASE PRESENTATIONS: Three cases of C. auris infection in patients with risk factors for fungal infection (Admitted to the intensive care unit, lymphoma and HIV respectively, all three with previous antibiotic use) and not epidemiologically related...
February 5, 2018: International Journal of Infectious Diseases: IJID
https://www.readbyqxmd.com/read/29345117/candida-auris-a-systematic-review-and-meta-analysis-of-current-updates-on-an-emerging-multidrug-resistant-pathogen
#7
John Osei Sekyere
From 2009, Candida auris has emerged as a multidrug-resistant ascomycete yeast pathogen with the capacity for easy transmission between patients and hospitals, as well as persistence on environmental surfaces. Its association with high mortalities, breakthrough and persistent candidaemia, inconsistencies in susceptibility testing results, misidentification by available commercial identification systems and treatment failure, complicates its management and detection. Within the last nine years, C. auris has been increasingly reported from far-Eastern Asia, the Middle East, Africa, Europe, South and North America with substantial fatalities and misidentification...
January 18, 2018: MicrobiologyOpen
https://www.readbyqxmd.com/read/29344802/protein-profiling-of-acanthamoeba-species-using-maldi-tof-ms-for-specific-identification-of-acanthamoeba-genotype
#8
Kirti Megha, Megha Sharma, Amit Gupta, Rakesh Sehgal, Sumeeta Khurana
Acanthamoeba spp. are ubiquitous in the environment and have the potential to cause severe infections. The different genotypes of Acanthamoeba have been shown to influence the severity of the disease and response to therapy. Characterizing Acanthamoeba spp. upto genotype can aid in infection control practices. Twenty-five Acanthamoeba isolates, characterized by 18S rDNA sequencing, were subjected to MALDI-TOF MS analysis by creating a database for the individual genotypes. The differentiating features of the various spectra were observed; the coded samples were then tested against the created database...
January 17, 2018: Parasitology Research
https://www.readbyqxmd.com/read/29285820/maldi-imaging-detects-endogenous-digoxin-in-glioblastoma-cells-infected-by-zika-virus-would-it-be-the-oncolytic-key
#9
Estela de O Lima, Tatiane M Guerreiro, Carlos Fernando O R Melo, Diogo N de Oliveira, Daisy Machado, Marcelo Lancelloti, Rodrigo R Catharino
No abstract text is available yet for this article.
March 2018: Journal of Mass Spectrometry: JMS
https://www.readbyqxmd.com/read/29224733/validated-maldi-tof-ms-method-for-anthrax-lethal-factor-provides-early-diagnosis-and-evaluation-of-therapeutics
#10
Maribel Gallegos-Candela, Anne E Boyer, Adrian R Woolfitt, Judy Brumlow, Renato C Lins, Conrad P Quinn, Alex R Hoffmaster, Gabriel Meister, John R Barr
Anthrax lethal factor (LF) is a zinc-dependent endoprotease and a critical virulence factor for Bacillus anthracis, the causative agent of anthrax. The mass spectrometry (MS) method for total-LF quantification includes three steps; 1) LF specific antibody capture/concentration, 2) LF-specific hydrolysis of a peptide substrate, and 3) detection and quantification of LF-cleaved peptides by isotope-dilution MALDI-TOF/MS. Recombinant LF spiked plasma was used for calibration and quality control (QC) materials. Specificity was 100% from analysis of serum and plasma from 383 non-infected humans, 31 rabbits, and 24 rhesus macaques...
February 15, 2018: Analytical Biochemistry
https://www.readbyqxmd.com/read/29193200/rapid-identification-of-microorganisms-from-platelet-concentrates-by-matrix-assisted-laser-desorption-ionization-time-of-flight-mass-spectrometry-after-short-term-incubation-on-liquid-medium
#11
Yasmine Chetouane, Gregory Dubourg, Pierre Gallian, Christophe Flaudrops, Jacques Chiaroni, Eric Chabrière, Didier Raoult, Laurence Camoin-Jau
BACKGROUND: Platelets (PLTs) are especially affected by the risk of bacterial contamination. Matrix-assisted laser desorption ionization time-of-flight (MALDI-TOF) is an accurate method for the routine identification of bacterial isolates in microbiology laboratories. We directly applied the MALDI-TOF method to bacterial detection in PLTs. In this study, we evaluated the sensitivity, specificity, and speed of a direct MALDI-TOF approach compared to the conventional method BACTEC. STUDY DESIGN AND METHODS: Eight bacteria associated with PLT contamination, cited by the ISBT on transfusion-transmitted infectious diseases, were spiked into PLTs for a final concentration of approximately 100 CFU/bag (n = 5 for each strain)...
November 28, 2017: Transfusion
https://www.readbyqxmd.com/read/29076587/high-prevalence-of-candiduria-due-to-non-albicans-candida-species-among-diabetic-patients-a-matter-of-concern
#12
Alireza Esmailzadeh, Hossein Zarrinfar, AbdolMajid Fata, Tanuka Sen
BACKGROUND: Among the fungal pathogens, Candida species are the most common cause of urinary tract infection (UTI). Some predisposing factors such as diabetes mellitus, urinary retention, urinary stasis, renal transplantation, and hospitalization can increase the risk of candiduria. The aim of this cross-sectional study was to evaluate candiduria among type 2 diabetic patients and identification of the Candida isolates. METHOD: Four hundred clean-catch midstream urine specimens were obtained from patients with type 2 diabetes mellitus...
October 27, 2017: Journal of Clinical Laboratory Analysis
https://www.readbyqxmd.com/read/29055988/-association-of-hla-dq-and-ifnl4-polymorphisms-with-hepatitis-b-virus-infection-and-clearance
#13
H Chen, J H Fan, W X Chen, J J Guo, Y Huang
Objective: To confirmed the polymorphisms of HLA-DQ and IFNL4 were associated with HBV infection and clearance in a Chinese population. Methods: The Sequenom MassARRAY MALDI-TOF system was used to genotype the HLA-DQrs9275319 and IFNL4rs368234815, rs12971396, rs12979860, and rs8099917. A binary logistic regression test was conducted to estimate the relative risk of these SNPs with HBV infection and clearance. Haploview4.2 software and PHASE software (v2.0.2) were employed to analyze linkage disequilibrium (LD) and haplotype frequencies...
July 20, 2017: Zhonghua Gan Zang Bing za Zhi, Zhonghua Ganzangbing Zazhi, Chinese Journal of Hepatology
https://www.readbyqxmd.com/read/29022241/a-panel-of-protein-candidates-for-comprehensive-study-of-caprine-arthritis-encephalitis-cae-infection
#14
Rosivaldo Quirino Bezerra Júnior, Ângela Maria Xavier Eloy, João Ricardo Furtado, Raymundo Rizaldo Pinheiro, Alice Andrioli, Frederico Bruno Moreno, Marina Duarte Pinto Lobo, Ana Cristina O Monteiro-Moreira, Renato de Azevedo Moreira, Tatiana Maria Farias Pinto, Maria Fátima da Silva Teixeira
The caprine arthrite encephalite (CAE) is a disease that affects especially dairy goat. The virus shows compartmentalization features, that allows it to hide at certain times during the course of the disease, making it difficult to control. The present study was conducted to identify the major seminal plasma protein profile of goats infected by CAE and its associations with seroconversion using Western blotting. Two groups containing five males each, were used in this experiment. The first group was composed by seropositive animals and the control by seronegative confirmed by Western blotting and PCR...
January 2018: Tropical Animal Health and Production
https://www.readbyqxmd.com/read/28950023/assessment-of-maldi-tof-ms-biotyping-for-borrelia-burgdorferi-sl-detection-in-ixodes-ricinus
#15
Pierre H Boyer, Nathalie Boulanger, Amira Nebbak, Elodie Collin, Benoit Jaulhac, Lionel Almeras
Matrix Assisted Laser Desorption/Ionization Time-of-Flight Mass Spectrometry (MALDI-TOF MS) has been demonstrated to be useful for tick identification at the species level. More recently, this tool has been successfully applied for the detection of bacterial pathogens directly in tick vectors. The present work has assessed the detection of Borrelia burgdorferi sensu lato in Ixodes ricinus tick vector by MALDI-TOF MS. To this aim, experimental infection model of I. ricinus ticks by B. afzelii was carried out and specimens collected in the field were also included in the study...
2017: PloS One
https://www.readbyqxmd.com/read/28936573/evaluation-of-beauveria-bassiana-infection-in-the%C3%A2-hemolymph-serum-proteins-of-the-housefly-musca-domestica-l-diptera-muscidae
#16
Sapna Mishra, Peeyush Kumar, Anushree Malik
Beauveria bassiana plays a prominent role in biocontrol of houseflies, Musca domestica (L.). Thus, a deeper insight into immune response of M. domestica during B. bassiana infection was warranted to assist the production of more efficient mycoinsecticides. The present study investigates changes in protein profile of M. domestica hemolymph serum post B. bassiana infection using two-dimensional difference gel electrophoresis (2D-DIGE) followed by identification of selected proteins by matrix-assisted laser desorption/ionization-time of flight mass spectrometry (MALDI-TOF MS)...
November 2017: Environmental Science and Pollution Research International
https://www.readbyqxmd.com/read/28811086/proteomic-profiling-of-the-antifungal-drug-response-of-aspergillus-fumigatus-to-voriconazole
#17
Nansalmaa Amarsaikhan, Daniela Albrecht-Eckardt, Christoph Sasse, Gerhard H Braus, Zumrut B Ogel, Olaf Kniemeyer
Antifungal resistance is an emerging problem and one of the reasons for treatment failure of invasive aspergillosis (IA). Voriconazole has become a standard therapeutic for the treatment of this often fatal infection. We studied the differentially expressed proteins as a response of Aspergillus fumigatus to voriconazole by employing the two-dimensional difference gel electrophoresis (DIGE) technique. Due to addition of drug, a total of 135 differentially synthesized proteins were identified by MALDI-TOF/TOF-mass spectrometry...
October 2017: International Journal of Medical Microbiology: IJMM
https://www.readbyqxmd.com/read/28712153/proteomic-analysis-reveals-the-enhancement-of-human-serum-apolipoprotein-a-1-apo-a-1-in-individuals-infected-with-multiple-dengue-virus-serotypes
#18
Nageswar Reddy Manchala, Ranjeet Dungdung, Rajendra Pilankatta
OBJECTIVES: Human serum protein profiling of the individual infected with multiple dengue virus serotypes for identifying the potential biomarkers and to investigate the cause for the severity of dengue virus infection. METHODS: Dengue virus NS1-positive serum samples were pooled into two groups (S2 and S3) based on the molecular serotyping and number of heterotypic infections. The pooled serum samples were subjected to two-dimensional gel electrophoresis (2DGE) to identify the differentially expressed proteins...
October 2017: Tropical Medicine & International Health: TM & IH
https://www.readbyqxmd.com/read/28646681/proteomic-analysis-of-developing-wheat-grains-infected-by-powdery-mildew-blumeria-graminis-f-sp-tritici
#19
Jie Li, Xi-Wen Yang, Yong-Chun Li, Ji-Shan Niu, De-Xian He
Blumeria graminis f.sp. tritici (Bgt) infection greatly interferes with the normal source-sink relationships and always causes tremendous loss of yield and quality in wheat. To better understand the impact of this pathogen on grain development, proteome characterization during grain development in susceptible wheat cultivar Xinong 979 infected by powdery mildew was investigated by 2-DE and tandem MALDI-TOF/TOF-MS. Identification of 111 differentially expressed protein spots representing 85 unique proteins and six expression patterns showed a chronological description of wheat grain formation...
August 2017: Journal of Plant Physiology
https://www.readbyqxmd.com/read/28566082/-femoral-hemodialysis-catheter-related-bacteremia-due-to-globicatella-sanguinis-challenges-in-species-identification
#20
Elif Aktaş, Nafia Canan Gürsoy, Tamer Sakacı, Yener Koç, Aziz Ahmad Hamidi, Emin Bulut, Duygu Erdemir, Barış Otlu
In this case, catheter-related bacteremia due to Globicatella sanguinis in a 43 years old female patient undergoing hemodialysis with the diagnosis of diabetic nephropathy was presented and the methods in the laboratory diagnosis of the rare opportunistic pathogen, Globicatella cins, were nvestigated. A set of peripheral blood cultures and simultaneous catheter culture was obtained from the patient in third of May 2016. Biochemical tests, Phoenix (Becton Dickinson, USA) and MicroScan (Beckman Coulter, USA) automated systems and matrix assisted laser desorption/ionization-time of flight-mass spectrometry (MALDI-TOF MS) based Microflex MS (Bruker, Daltonics, Germany) and VITEK MS (database v2...
April 2017: Mikrobiyoloji Bülteni
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