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https://www.readbyqxmd.com/read/28734024/effect-of-solvent-and-protein-dynamics-in-ligand-recognition-and-inhibition-of-aminoglycoside-adenyltransferase-2%C3%A2-ia
#1
Valjean R Bacot-Davis, Angelia V Bassenden, Tara Sprules, Albert M Berghuis
The aminoglycoside modifying enzyme (AME) ANT(2″)-Ia is a significant target for next generation antibiotic development. Structural studies of a related aminoglycoside-modifying enzyme, ANT(3″)(9), revealed this enzyme contains dynamic, disordered, and well-defined segments that modulate thermodynamically before and after antibiotic binding. Characterizing these structural dynamics is critical for in situ screening, design, and development of contemporary antibiotics that can be implemented in a clinical setting to treat potentially lethal, antibiotic resistant, human infections...
July 21, 2017: Protein Science: a Publication of the Protein Society
https://www.readbyqxmd.com/read/28729209/clonal-spread-of-methicillin-resistant-staphylococcus-aureus-t6065-cc5-sccmecv-agrii-in-a-libyan-hospital
#2
Monia Khemiri, Ali Akrout Alhusain, Mohamed Salah Abbassi, Houyem El Ghaieb, Sofia Santos Costa, Adriana Belas, Constança Pomba, Salah Hammami
OBJECTIVES: The aim of this study was to characterize 32 MRSA isolates recovered from wound specimens of patients in a Hospital in Tripoli, Libya, during 2013. METHODS: MRSA isolates were characterized by determining their antibiotic susceptibilities, genes encoding antibiotic resistance and virulence factors, the SCCmec class, agr type, spa typing, PFGE and MLST. RESULTS: PFGE and MLST revealed that all isolates were clonal and belonged to the Clonal Complex 5 (CC5)...
July 17, 2017: Journal of Global Antimicrobial Resistance
https://www.readbyqxmd.com/read/28729208/detection-of-multidrug-resistant-mdr-bacteria-in-untreated-waste-water-disposals-of-hospitals-in-dhaka-city-bangladesh
#3
M A G Rabbani, Md Zakir Hossain Hawlader, Yearul Kabir
BACKGROUND: Emergence of MDR bacteria is a global problem and a major burden for treatment of various infectious diseases. This study was performed to detect antibiotic resistant bacteria in untreated hospital waste. METHOD: Waste water samples were collected from sewerage disposal points of two renowned hospital of Dhaka city and a total of 59 Escherichia coli and 29 Klebsiella pneumonia isolates were isolated. Antibiotic susceptibility were measured by disc diffusion method...
July 17, 2017: Journal of Global Antimicrobial Resistance
https://www.readbyqxmd.com/read/28715370/inducible-t7-rna-polymerase-mediated-multigene-expression-system-pmgx
#4
Mohamed I Hassan, Fern R McSorley, Kinya Hotta, Christopher N Boddy
Co-expression of multiple proteins is increasingly essential for synthetic biology, studying protein-protein complexes, and characterizing and harnessing biosynthetic pathways. In this manuscript, the use of a highly effective system for the construction of multigene synthetic operons under the control of an inducible T7 RNA polymerase is described. This system allows many genes to be expressed simultaneously from one plasmid. Here, a set of four related vectors, pMGX-A, pMGX-hisA, pMGX-K, and pMGX-hisK, with either the ampicillin or kanamycin resistance selectable marker (A and K) and either possessing or lacking an N-terminal hexahistidine tag (his) are disclosed...
June 27, 2017: Journal of Visualized Experiments: JoVE
https://www.readbyqxmd.com/read/28711791/labeled-azospirillum-brasilense-wild-type-and-excretion-ammonium-strains-in-association-with-barley-roots
#5
Adrian Richard Schenberger Santos, Rafael Mazer Etto, Rafaela Wiegand Furmam, Denis Leandro de Freitas, Karina Freire d'Eça Nogueira Santos, Emanuel Maltempi de Souza, Fábio de Oliveira Pedrosa, Ricardo Antônio Ayub, Maria Berenice Reynaud Steffens, Carolina Weigert Galvão
Soil bacteria colonization in plants is a complex process, which involves interaction between many bacterial characters and plant responses. In this work, we labeled Azospirillum brasilense FP2 (wild type) and HM053 (excretion-ammonium) strains by insertion of the reporter gene gusA-kanamycin into the dinitrogenase reductase coding gene, nifH, and evaluated bacteria colonization in barley (Hordeum vulgare). In addition, we determined inoculation effect based on growth promotion parameters. We report an uncommon endophytic behavior of A...
July 4, 2017: Plant Physiology and Biochemistry: PPB
https://www.readbyqxmd.com/read/28710637/stabilization-of-enzymes-by-using-thermophiles
#6
Ana Luisa Ribeiro, Mercedes Sánchez, Aurelio Hidalgo, José Berenguer
Manufactured steroid compounds have many applications in the pharmaceutical industry. Due to the chemical complexity and chirality of steroids, there is an increasing demand for enzyme-based bioconversion processes to replace those based on chemical synthesis. In this context, thermostability of the involved enzymes is a highly desirable property as both the increased half-life of the enzyme and the enhanced solubility of substrates and products will improve the yield of the reactions. Metagenomic libraries from thermal environments are potential sources of thermostable enzymes of prokaryotic origin, but the number of expected hits could be quite low for enzymes handling substrates such as steroids, rarely found in prokaryotes...
2017: Methods in Molecular Biology
https://www.readbyqxmd.com/read/28705770/in%C3%A2-vitro-activity-of-aminoglycosides-clofazimine-d-cycloserine-and-dapsone-against-83-mycobacterium-avium-complex-clinical-isolates
#7
Chen-Cheng Huang, Ming-Feng Wu, Hui-Chen Chen, Wei-Chang Huang
BACKGROUND/PURPOSE: Treatment success rates for Mycobacterium avium complex (MAC) diseases range from 50% to 55% only. To explore effective antimicrobials against either Mycobacteriumintracellulare or M. avium, we determined in vitro activities of five aminoglycosides, clofazimine, dapsone and d-cycloserine compared with primary (clarithromycin) and secondary (moxifloxacin and linezolid) antimycobacterial agents. METHODS: 83 non-duplicate clinical MAC isolates were collected from sputum and identified at the species level by PCR and restriction enzyme analysis of the 65 kDa hsp and rpoB genes...
June 28, 2017: Journal of Microbiology, Immunology, and Infection, Wei Mian Yu Gan Ran za Zhi
https://www.readbyqxmd.com/read/28698044/resistance-to-first-and-second-line-antituberculosis-drugs-in-southern-taiwan-implications-for-empirical-treatment
#8
Cheng-Yu Kuo, Wen-Hung Wang, Chung-Hao Huang, Yen-Hsu Chen, Po-Liang Lu
BACKGROUND: Multidrug-resistant and extensively drug-resistant tuberculosis infections cause public health concerns worldwide. Local epidemiologic data about the drug resistance of Mycobacteriumtuberculosis isolate (Mtb) is critical to guide appropriate empirical therapy to cure patients and restrain the spread of tuberculosis. METHODS: Antituberculosis susceptibility testing was performed for 287 Mtbs, including 63 MDR-Mtbs collected in southern Taiwan from 2011 to 2015...
June 29, 2017: Journal of Microbiology, Immunology, and Infection, Wei Mian Yu Gan Ran za Zhi
https://www.readbyqxmd.com/read/28694178/medicinal-plants-used-in-the-treatment-of-tuberculosis-ethnobotanical-and-ethnopharmacological-approaches
#9
REVIEW
Javad Sharifi-Rad, Bahare Salehi, Zorica Z Stojanović-Radić, Patrick Valere Tsouh Fokou, Marzieh Sharifi-Rad, Gail B Mahady, Majid Sharifi-Rad, Mohammad-Reza Masjedi, Temitope O Lawal, Seyed Abdulmajid Ayatollahi, Javid Masjedi, Razieh Sharifi-Rad, William N Setzer, Mehdi Sharifi-Rad, Farzad Kobarfard, Atta-Ur Rahman, Muhammad Iqbal Choudhary, Athar Ata, Marcello Iriti
Tuberculosis is a highly infectious disease declared a global health emergency by the World Health Organization, with approximately one third of the world's population being latently infected with Mycobacterium tuberculosis. Tuberculosis treatment consists in an intensive phase and a continuation phase. Unfortunately, the appearance of multi drug-resistant tuberculosis, mainly due to low adherence to prescribed therapies or inefficient healthcare structures, requires at least 20months of treatment with second-line, more toxic and less efficient drugs, i...
July 8, 2017: Biotechnology Advances
https://www.readbyqxmd.com/read/28694139/systematic-review-and-meta-analysis-of-the-nitrate-reductase-assay-for-drug-susceptibility-testing-of-mycobacterium-tuberculosis-and-the-detection-limits-in-liquid-medium
#10
Miri Kwak, Won-Kyu Lee, Young Ju Lim, Seung Heon Lee, Sungweon Ryoo
Recently, the need for rapid, reliable, and low-cost drug susceptibility testing (DST) methods has increased due to the emergence of multidrug-resistant Mycobacterium tuberculosis. Colorimetric methods of DST provide results more quickly than standard culture methods and are inexpensive than molecular methods. Thus, colorimetric methods, such as the nitrate reductase assay (NRA), are being recommended. We searched Medline PubMed for reports on the NRA for DST of M. tuberculosis written in English and published within the last five years...
July 7, 2017: Journal of Microbiological Methods
https://www.readbyqxmd.com/read/28685903/the-structure-of-rbmb-from-streptomyces-ribosidificus-an-aminotransferase-involved-in-the-biosynthesis-of-ribostamycin
#11
Trevor R Zachman-Brockmeyer, James B Thoden, Hazel M Holden
Aminoglycoside antibiotics represent a classical group of antimicrobials first discovered in the 1940s. Due to their ototoxic and nephrotoxic side effects, they are typically only used against Gram negative bacteria who have become resistant to other therapeutics. One family of aminoglycosides include such compounds as butirosin, ribostamycin, neomycin, and kanamycin, amongst others. The common theme in these antibiotics is that they are constructed around a chemically stable aminocyclitol unit referred to as 2-deoxystreptamine (2-DOS)...
July 7, 2017: Protein Science: a Publication of the Protein Society
https://www.readbyqxmd.com/read/28684253/subinhibitory-concentrations-of-gentamicin-trigger-expression-of-aac-6-ie-aph-2%C3%A2-ia-chaperones-and-biofilm-related-genes-in-lactobacillus-plantarum-mcc3011
#12
Jaimee George, Prakash Motiram Halami
This study aimed to analyze the effects of subinhibitory concentrations of gentamicin on expression of high-level aminoglycoside-resistant (HLAR) bifunctional aac(6')-Ie-aph(2″)Ia, biofilm and chaperone genes in Lactobacillus plantarum. Analysis of biofilm formation in five isolates obtained from chicken sausages indicated their role in exhibiting phenotypic resistance based on varied MIC values, despite carrying the bifunctional gene. Biofilm formation significantly increased when L. plantarum MCC3011 was grown in subinhibitory concentrations of gentamicin (4 μg/ml), kanamycin (8 μg/ml) and streptomycin (2 μg/ml)...
July 4, 2017: Research in Microbiology
https://www.readbyqxmd.com/read/28668467/identification-of-a-pvl-negative-sccmec-iva-sub-lineage-of-the-methicillin-resistant-staphylococcus-aureus-cc80-lineage-understanding-the-clonal-origin-of-ca-mrsa
#13
Sofie Marie Edslev, Henrik Torkil Westh, Paal Skytt Andersen, Robert Skov, Nobumichi Kobayashi, Mette Damkjær Bartels, Francois Vandenesh, Andreas Petersen, Peder Worning, Anders Rhod Larsen, Marc Stegger
OBJECTIVES: Community-acquired MRSA (CA-MRSA) isolates belonging to clonal complex 80 (CC80) are recognized as the European CA-MRSA. The prevailing European CA-MRSA clone carries a type IVc staphylococcal cassette chromosome mec (SCCmec) and expresses Panton-Valentine leukocidin (PVL). Recently, a significant increase of PVL-negative CC80 MRSA has been observed in Denmark. The aim of this study was to examine the genetics and the epidemiology of these, and to compare them to the European CA-MRSA clone in order to understand the emergence of PVL-negative CC80 MRSA...
June 28, 2017: Clinical Microbiology and Infection
https://www.readbyqxmd.com/read/28657319/gradient-coating-of-polydopamine-via-cdr
#14
Mei-Xia Zhao, Junwei Li, Xiaohu Gao
Surfaces with gradient properties are of central importance for a number of chemical and biological processes. Here, we report rapid generation of a polydopamine (PDA) gradient on hydrophobic surfaces by a simple, low cost, and general technology, cyclic draining-replenishing (CDR). Due to the unique surface chemistry of PDA, it enables continuous and precise control of surface wettability and subsequent deposition of organic and inorganic compounds. Using kanamycin as a model compound, we show that the gradient PDA membrane potentially can be used to prepare minimum inhibitory concentration (MIC) test strips for quantifying resistance of antimicrobial agents from microorganisms...
June 28, 2017: Langmuir: the ACS Journal of Surfaces and Colloids
https://www.readbyqxmd.com/read/28656549/kanamycin-damages-early-postnatal-but-not-adult-spiral-ganglion-neurons
#15
Kelei Gao, Dalian Ding, Hong Sun, Jerome Roth, Richard Salvi
Although aminoglycoside antibiotics such as kanamycin are widely used clinically to treat life-threatening bacterial infections, ototoxicity remains a significant dose-limiting side effect. The prevailing view is that the hair cells are the primary ototoxic target of aminoglycosides and that spiral ganglion neurons begin to degenerate weeks or months after the hair cells have died due to lack of neurotrophic support. To test the early developmental aspects of this issue, we compared kanamycin-induced hair cell and spiral ganglion pathology in rat postnatal day 3 cochlear organotypic cultures with adult whole cochlear explants...
June 27, 2017: Neurotoxicity Research
https://www.readbyqxmd.com/read/28654744/mimicking-an-enzyme-based-colorimetric-aptasensor-for-antibiotic-residue-detection-in-milk-combining-magnetic-loop-dna-probes-and-cha-assisted-target-recycling-amplification
#16
Qian Luan, Ning Gan, Yuting Cao, Tianhua Li
A mimicking-enzyme-based colorimetric aptasensor was developed for the detection of kanamycin (KANA) in milk using magnetic loop-DNA-NMOF-Pt (m-L-DNA) probes and catalytic hairpin assembly (CHA)-assisted target recycling for signal amplification. The m-L-DNA probes were constructed via hybridization of hairpin DNA H1 (containing aptamer sequence) immobilized magnetic beads (m-H1) and signal DNA (sDNA, partial hybridization with H1) labeled nano Fe-MIL-88NH2-Pt (NMOF-Pt-sDNA). In the presence of KANA and complementary hairpin DNA H2, the m-L-DNA probes decomposed and formed an m-H1/KANA intermediate, which triggered the CHA reaction to form a stable duplex strand (m-H1-H2) while releasing KANA again for recycling...
July 7, 2017: Journal of Agricultural and Food Chemistry
https://www.readbyqxmd.com/read/28648728/microstructure-characterization-of-hydrothermally-synthesized-pani-v2o5%C3%A2-nh2o-heterojunction-photocatalyst-for-visible-light-induced-photodegradation-of-organic-pollutants-and-non-absorbing-colorless-molecules
#17
Samapti Kundu, Biswarup Satpati, Tanusree Kar, Swapan Kumar Pradhan
Polyaniline intercalated vanadium oxide xerogel (PV) hybrid nanocomposite (NC) with novel structure has been successfully synthesized through a simple hydrothermal route. Detailed structure and microstructure characterization of PV NC is illustrated through Rietveld refinement of XRD data and FESEM/HRTEM images. Both FTIR and XPS spectra confirm the presence of PANI and water molecules within the NC and partial reduction of V(5+) to V(4+), corroborating with the results of XRD pattern analysis. Core-shell structure of PV NC, where PANI sheath layer acts as a shell covering around V2O5·nH2O crystalline core is confirmed from HRTEM images...
June 17, 2017: Journal of Hazardous Materials
https://www.readbyqxmd.com/read/28642752/a-comprehensive-epidemiological-research-for-clinical-vibrio-parahaemolyticus-in-shanghai
#18
Huan Li, Rong Tang, Yang Lou, Zelin Cui, Wenjing Chen, Qing Hong, Zhaohuan Zhang, Pradeep K Malakar, Yingjie Pan, Yong Zhao
Vibrio parahaemolyticus is one of the most important pathogen for seafood-borne gastroenteritis in Shanghai and the rest of the world. A total of 42 V. parahaemolyticus strains were isolated from 1900 fecal specimens collected from patients in Shanghai hospital presenting from January 2014 to December 2015. All isolates were evaluated for potential virulence factors [tdh, trh, and type three secretion system (T3SS) genes], typed using multilocus sequence typing (MLST) and screened for antimicrobial resistance phenotype and genotype...
2017: Frontiers in Microbiology
https://www.readbyqxmd.com/read/28640905/an-efficient-method-for-transgenic-callus-induction-from-vitis-amurensis-petiole
#19
Tingting Zhao, Zemin Wang, Lingye Su, Xiaoming Sun, Jun Cheng, Langlang Zhang, Sospeter Karanja Karungo, Yuepeng Han, Shaohua Li, Haiping Xin
Transformation is the main platform for genetic improvement and gene function studies in plants. However, the established somatic embryo transformation system for grapevines is time-consuming and has low efficiency, which limits its utilization in functional genomics research. Vitis amurensis is a wild Vitis species with remarkable cold tolerance. The lack of an efficient genetic transformation system for it has significantly hindered the functional identification of cold stress related genes in the species...
2017: PloS One
https://www.readbyqxmd.com/read/28640870/dominance-of-community-associated-methicillin-resistant-staphylococcus-aureus-clones-in-a-maternity-hospital
#20
Edet E Udo, Noura Al-Sweih
BACKGROUND: Methicillin- resistant Staphylococcus aureus (MRSA) is a major pathogen causing healthcare- and community- acquired infections. The purpose of this study was to characterize MRSA isolated at the Maternity Hospital between 2006 and 2011 for their genetic relatedness. MATERIALS AND METHODS: The MRSA isolates were investigated using a combination of antibiogram, Staphylococcal chromosome cassette mec (SCCmec) and spa typing to determine their relatedness to MRSA isolated in other Kuwait hospitals...
2017: PloS One
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