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New delhi metallo

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https://www.readbyqxmd.com/read/28432959/molecular-dynamics-simulation-studies-of-novel-%C3%AE-lactamase-inhibitor
#1
Farhan Ul Haq, Asma Abro, Saad Raza, Klaus R Liedl, Syed Sikander Azam
New Delhi Metallo-β-Lactamase-1 (NDM-1) has drawn great attention due to its diverse antibiotic resistant activity. It can hydrolyze almost all clinically available β-lactam antibiotics. To inhibit the activity of NDM-1 a new strategy is proposed using computational methods. Molecular dynamics (MD) simulations are used to analyze the molecular interactions between selected inhibitor candidates and NDM-1 structure. The enzyme-ligand complex is subject to binding free energy calculations using MM(PB/GB)SA methods...
April 4, 2017: Journal of Molecular Graphics & Modelling
https://www.readbyqxmd.com/read/28417918/high-prevalence-of-blandm-1-blavim-qace-and-qace%C3%AE-1-genes-and-their-association-with-decreased-susceptibility-to-antibiotics-and-common-hospital-biocides-in-clinical-isolates-of-acinetobacter-baumannii
#2
Fatma Alzahraa M Gomaa, Zeinab H Helal, Mazhar I Khan
The objective of this study was to evaluate the susceptibility of metallo-β-lactamase (MBL)-producing Acinetobacter baumannii (A. baumannii) clinical isolates to biocides. We also determined the prevalence and correlation of efflux pump genes, class 1 integron and MBL encoding genes. In addition, blaVIM, blaNDM-1, qacE and qacEΔ1 nucleotide sequence analysis was performed and compared to sequences retrieved from GenBank at the National Center for Biotechnology Information database. A. baumannii had a resistance rate to carbapenem of 71...
April 12, 2017: Microorganisms
https://www.readbyqxmd.com/read/28416558/in-vitro-discordance-with-in-vivo-activity-humanized-exposures-of-ceftazidime-avibactam-aztreonam-and-tigecycline-alone-and-in-combination-against-new-delhi-metallo-%C3%AE-lactamase-producing-klebsiella-pneumoniae-in-a-murine-lung-infection-model
#3
M L Monogue, L M Abbo, R Rosa, J F Camargo, O Martinez, R A Bonomo, D P Nicolau
The management of infections with New Delhi Metallo-beta-lactamase-1 (NDM) producing bacteria remains clinically challenging given the multi-drug resistant (MDR) phenotype associated with these bacteria. Despite resistance in vitro, ceftazidime-avibactam previously demonstrated in vivo activity against NDM+ Enterobacteriaceae. Herein, we observed in vitro synergy with ceftazidime-avibactam and aztreonam against a MDR K. pneumoniae harboring NDM. In vivo, humanized doses of ceftazidime-avibactam monotherapy resulted in > 2 log10CFU bacterial reduction, therefore, no in vivo synergy was observed...
April 17, 2017: Antimicrobial Agents and Chemotherapy
https://www.readbyqxmd.com/read/28386246/virulence-and-genomic-feature-of-a-virulent-klebsiella-pneumoniae-sequence-type-14-strain-of-serotype-k2-harboring-blandm-5-in-china
#4
Yan-Fang Mei, Pan-Pan Liu, La-Gen Wan, Yang Liu, Lian-Hui Wang, Dan-Dan Wei, Qiong Deng, Xian-Wei Cao
The objective of this study was to reveal the molecular mechanism involved in carbapenem resistance and virulence of a K2 Klebsiella pneumoniae clinical isolate 24835. The virulence of the strain was determined by in vitro and in vivo methods. The de novo whole-genome sequencing technology and molecular biology methods were used to analyze the genomic features associated with the carbapenem resistance and virulence of K. pneumoniae 24835. Strain 24835 was highly resistant to carbapenems and belonged to ST14, exhibited hypermucoviscous and unique K2-aerobactin-kfu-rmpA positive phenotype...
2017: Frontiers in Microbiology
https://www.readbyqxmd.com/read/28357923/performance-of-carbanp-and-cim-tests-in-oxa-48-carbapenemase-producing-enterobacteriaceae
#5
Serap Süzük Yıldız, Banu Kaşkatepe, Havva Avcıküçük, Şükran Öztürk
This study applied two phenotypic tests, namely "Carbapenemase Nordmann-Poirel" (CarbaNP) test and "Carbapenem Inactivation Method" (CIM), against the isolates carrying the carbapenem resistance genes. The study included 83 carbapenem-resistant Enterobacteriaceae isolates producing oxacillinase-48 (OXA-48) and 30 carbapenem-sensitive Enterobacteriaceae isolates. Out of the total isolates studied, 77 isolates (92.77%) were identified as Klebsiella pneumoniae and six isolates (7.23%) were identified as Escherichia coli by Matrix Assisted Laser Desorption Ionization-Time of Flight Mass Spectrometry...
March 1, 2017: Acta Microbiologica et Immunologica Hungarica
https://www.readbyqxmd.com/read/28345184/spatial-molecular-epidemiology-of-carbapenem-resistant-and-new-delhi-metallo-beta-lactamase-blandm-producing-escherichia-coli-strains-from-farmed-piglets-of-india
#6
B S Pruthvishree, O R Vinodh Kumar, D K Sinha, Y P S Malik, Z Dubal, P A Desingu, M Shivakumar, Narayanan Krishnaswamy, B R Singh
AIM: A cross-sectional study was conducted in ten government organized pig farms between 2014 and 2016 representing seven states of India to understand the epidemiology of carbapenem resistance in Escherichia coli isolates. METHODS AND RESULTS: In this study, 673 fecal samples both from non- diarhhoeic (n=501) and diarrhoeic (n=172) piglets were processed for isolation of carbapenem resistant E. coli. Wherein, 112 confirmed E. coli isolates were further subjected for genotypic confirmation of carbapenem resistance and virulence factors...
March 27, 2017: Journal of Applied Microbiology
https://www.readbyqxmd.com/read/28337042/household-transmission-of-ndm-producing-e-coli-in-new-zealand
#7
Matthew Blakiston, Sally A Roberts, Joshua T Freeman, Helen Heffernan
This report describes the introduction of an extensively antibiotic-resistant carbapenemase-producing Escherichia coli into a hospital in Auckland, New Zealand, by a patient who was a household contact of recent travellers to the Indian subcontinent. The carbapenemase was identified as New Delhi metallo-β-lactamase (NDM) and reflects probable household transmission in the context of a recent upsurge in NDM-producing Enterobacteriaceae isolation in New Zealand. The observations in this report suggest that hospital screening practices to identify carbapenemase-producing Enterobacteriaceae (CPE) colonised patients may need to be extended to include travellers to high-risk countries who were not hospitalised during their trip, and possibly also their close contacts...
March 24, 2017: New Zealand Medical Journal
https://www.readbyqxmd.com/read/28319394/a-network-of-conformational-transitions-in-the-apo-form-of-ndm-1-enzyme-revealed-by-md-simulation-and-a-markov-state-model
#8
Kaifu Gao, Yunjie Zhao
New Delhi metallo-β-lactamase-1 (NDM-1) is a novel β-lactamase enzyme that confers enteric bacteria with nearly complete resistance to all β-lactam antibiotics, so it raises a formidable and global threat to human health. However, the binding mechanism between apo-NDM-1 and antibiotics as well as related conformational changes remains poorly understood, which largely hinders the overcoming of its antibiotic resistance. In our study, long-time conventional molecular dynamics simulation and Markov state models were applied to reveal both the dynamical and conformational landscape of apo-NDM-1: the MD simulation demonstrates that loop L3, which is responsible for antibiotic binding, is the most flexible and undergoes dramatic conformational changes; moreover, the Markov state model built from the simulation maps four metastable states including open, semiopen, and closed conformations of loop L3 as well as frequent transitions between the states...
March 30, 2017: Journal of Physical Chemistry. B
https://www.readbyqxmd.com/read/28251105/carbapenemase-producing-enterobacteriaceae-risk-factors-for-infection-and-impact-of-resistance-on-outcomes
#9
Shanthi Mariappan, Uma Sekar, Arunagiri Kamalanathan
BACKGROUND: Carbapenemase-producing Enterobacteriaceae (CPE) have increased in recent years leading to limitations of treatment options. The present study was undertaken to detect CPE, risk factors for acquiring them and their impact on clinical outcomes. METHODS: This retrospective observational study included 111 clinically significant Enterobacteriaceae resistant to cephalosporins subclass III and exhibiting a positive modified Hodge test. Screening for carbapenemase production was done by phenotypic methods, and polymerase chain reaction was performed to detect genes encoding them...
January 2017: International Journal of Applied and Basic Medical Research
https://www.readbyqxmd.com/read/28242668/plasmid-mediated-novel-blandm-17-gene-encoding-a-carbapenemase-with-enhanced-activity-in-a-st48-escherichia-coli-strain
#10
Zhihai Liu, Yang Wang, Timothy R Walsh, Dejun Liu, Zhangqi Shen, Rongmin Zhang, Wenjuan Yin, Hong Yao, Jiyun Li, Jianzhong Shen
Carbapenem-resistant Enterobacteriaceae (CRE) have spread worldwide, leaving very few treatment options available. New Delhi metallo-beta-lactamase (NDM) is the main carbapenemase mediating CRE resistance, and is of increasing concern. NDM-positive Enterobacteriaceae of human origin are frequently identified; however, the emergence of NDM, particularly novel variants, in bacteria of food animal origin has never been reported. Here, we characterize a novel NDM variant (assigned NDM-17) identified in a β-lactam-resistant sequence type 48 (ST48) Escherichia coli strain that was isolated from a chicken in China...
February 27, 2017: Antimicrobial Agents and Chemotherapy
https://www.readbyqxmd.com/read/28239454/transcriptional-analysis-of-blandm-1-and-copy-number-alteration-under-carbapenem-stress
#11
Deepjyoti Paul, Amitabha Bhattacharjee, Dibyojyoti Bhattacharjee, Debadatta Dhar, Anand Prakash Maurya, Atanu Chakravarty
BACKGROUND: New Delhi metallo beta-lactamase is known to compromise carbapenem therapy and leading to treatment failure. However, their response to carbapenem stress is not clearly known. Here, we have investigated the transcriptional response of blaNDM-1 and plasmid copy number alteration under carbapenem exposure. METHODS: Three blaNDM-1 harboring plasmids representing three incompatibility types (IncFIC, IncA/C and IncK) were inoculated in LB broth with and without imipenem, meropenem and ertapenem...
2017: Antimicrobial Resistance and Infection Control
https://www.readbyqxmd.com/read/28156193/characterization-of-ndm-7-carbapenemase-producing-escherichia-coli-isolates-in-the-arabian-peninsula
#12
Tibor Pál, Akela Ghazawi, Dania Darwish, Laura Villa, Alessandra Carattoli, Rayhan Hashmey, Zulfa Aldeesi, Wafaa Jamal, Vincent Rotimi, Amina Al-Jardani, Seif S Al-Abri, Ágnes Sonnevend
AIM: The purpose of this study was to characterize the New Delhi metallo-beta lactamase (NDM)-7-producing Enterobacteriaceae isolated in the Arabian Peninsula. METHODS: Enterobacteriaceae identified to carry blaNDM-7 in a collection of 157 NDM-producing isolates from Kuwait, Oman, Saudi Arabia, and the United Arab Emirates (UAE) were investigated for their antibiotic and disinfectant susceptibility, and resistance gene content. The virulence profile, phylogenetic and sequence types of the isolates were also determined...
February 3, 2017: Microbial Drug Resistance: MDR: Mechanisms, Epidemiology, and Disease
https://www.readbyqxmd.com/read/28150578/resistotyping-phenotyping-and-genotyping-of-new-delhi-metallo-%C3%AE-lactamase-ndm-among-gram-negative-bacilli-from-iranian-patients
#13
Dariush Shokri, Mohammad Rabbani Khorasgani, Seyed Masih Fatemi, Abbas Soleimani-Delfan
PURPOSE: The purpose of this study was investigation of New Delhi metallo-β-lactamase (NDM) production among gram negative bacilli. METHODOLOGY: Antibiogram-Resistotyping and detection of NDM in clinical isolates of Klebsiella pneumoniae, Acinetobacter baumannii and Pseudomonas aeruginosa and comparative evaluation of the diagnostic performance of three phenotypic methods for NDM detection considering PCR as gold standard were performed. Minimum Inhibitory Concentration (MIC) of antibiotics against NDM positive strains by E-test and clonal relationship analysis using Enterobacterial Repetitive Intergenic Consensus Polymerase Chain Reaction (ERIC-PCR) in these strains were determined...
February 1, 2017: Journal of Medical Microbiology
https://www.readbyqxmd.com/read/28131738/occurrence-of-blandm-7-within-incx3-type-plasmid-of-escherichia-coli-from-india
#14
Deepjyoti Paul, Amitabha Bhattacharjee, Birson Ingti, Nargis Alom Choudhury, Anand Prakash Maurya, Debadatta Dhar, Atanu Chakravarty
BACKGROUND: New-Delhi metallo-β-lactamase-7 with higher hydrolytic activity than its ancestor NDM-1 is emerging across the globe including India. In this study, we have investigated the genetic context of blaNDM-7 and alteration in plasmid copy number under concentration gradient carbapenem stress. MATERIALS AND METHODS: Six blaNDM-7 producing Escherichia coli isolates were obtained from Silchar Medical College and Hospital and the co-existence of other β-lactamases and transferability of this resistant determinant was determined by transformation and conjugation assay followed by typing of the plasmid by PBRT method...
January 25, 2017: Journal of Infection and Chemotherapy: Official Journal of the Japan Society of Chemotherapy
https://www.readbyqxmd.com/read/28104504/diversity-of-new-delhi-metallo-beta-lactamase-producing-bacteria-in-china
#15
Xiaofeng Hu, Xuebing Xu, Xu Wang, Wencheng Xue, Haijian Zhou, Ling Zhang, Qiuxia Ma, Rongtao Zhao, Guozheng Li, Peng Li, Chuanfu Zhang, Yun Shi, Jian Wang, Leili Jia, Rongzhang Hao, Ligui Wang, Dayang Zou, Xuelin Liu, Shaofu Qiu, Hongbin Song, Yansong Sun
OBJECTIVES: The prevalence and dissemination of diverse NDM-producing bacteria in China was investigated. METHODS: We collected 1,162 isolates from 8 cities during December 2013∼May 2015 in China. The NDM-positive strains as well as the NDM genotypes in these sample were detected via Vitek 2 compact system (bioMérieux, France), 16S rRNA gene sequencing, PCR and an S1- pulsed-field gel electrophoresis assay and Southern blot hybridization. The horizontal-transfer capability of the blaNDM gene was assessed by filter mating by using a standard E...
February 2017: International Journal of Infectious Diseases: IJID
https://www.readbyqxmd.com/read/28087620/e152a-substitution-drastically-affects-ndm-5-activity
#16
Gaurav Kumar, Bagre Issa, Debasish Kar, Sarmistha Biswal, Anindya S Ghosh
New Delhi Metallo beta-lactamase (NDM) is of significant public health concern due to its enormous potential to hydrolyse all major beta-lactams including carbapenems. Amino acid substitutions outside the active site reportedly affect NDM beta-lactamase activities. Here, the effect of amino acid substitutions in the possible omega-like loop region of NDM-5 has been elucidated. Overall, three substitution mutations near active site of NDM-5 were done, namely, E152A, S191A and D223A and subsequently, the change in antimicrobial resistance was monitored upon expressing each mutant in a suitable host...
February 1, 2017: FEMS Microbiology Letters
https://www.readbyqxmd.com/read/28087584/emergence-of-klebsiella-variicola-positive-for-ndm-9-a-variant-of-new-delhi-metallo-%C3%AE-lactamase-in-an-urban-river-in-south-korea
#17
Doris Y W Di, Jeonghwan Jang, Tatsuya Unno, Hor-Gil Hur
Objectives: To examine the presence of pathogenic bacteria carrying New Delhi metallo-β-lactamase in the environment and to characterize the genome structures of these strains. Methods: Phenotypic screening of antimicrobial susceptibility and WGS were conducted on three Klebsiella variicola strains possessing NDM-9 isolated from an urban river. Results: Three carbapenem-resistant K. variicola isolated from Gwangju tributary were found to possess bla NDM-9 genes...
April 1, 2017: Journal of Antimicrobial Chemotherapy
https://www.readbyqxmd.com/read/28081065/notes-from-the-field-pan-resistant-new-delhi-metallo-beta-lactamase-producing-klebsiella-pneumoniae-washoe-county-nevada-2016
#18
Lei Chen, Randall Todd, Julia Kiehlbauch, Maroya Walters, Alexander Kallen
No abstract text is available yet for this article.
January 13, 2017: MMWR. Morbidity and Mortality Weekly Report
https://www.readbyqxmd.com/read/27999041/peptide-conjugated-phosphorodiamidate-morpholino-oligomer-ppmo-restores-carbapenem-susceptibility-to-ndm-1-positive-pathogens-in-vitro-and-in-vivo
#19
Erin K Sully, Bruce L Geller, Lixin Li, Christina M Moody, Stacey M Bailey, Amy L Moore, Michael Wong, Patrice Nordmann, Seth M Daly, Carolyn R Sturge, David E Greenberg
Objectives: The objective of this study was to test the efficacy of an inhibitor of the New Delhi metallo-β- lactamase (NDM-1). Inhibiting expression of this type of antibiotic-resistance gene has the potential to restore antibiotic susceptibility in all bacteria carrying the gene. Methods: We have constructed a peptide-conjugated phosphorodiamidate morpholino oligomer (PPMO) that selectively inhibits the expression of NDM-1 and examined its ability to restore susceptibility to meropenem in vitro and in vivo ...
March 1, 2017: Journal of Antimicrobial Chemotherapy
https://www.readbyqxmd.com/read/27977640/notes-from-the-field-new-delhi-metallo-%C3%AE-lactamase-producing-carbapenem-resistant-enterobacteriaceae-identified-in-patients-without-known-health-care-risk-factors-colorado-2014-2016
#20
Sarah J Janelle, Alexander Kallen, Tom de Man, Brandi Limbago, Maroya Walters, Alison Halpin, Karen Xavier, Joyce Knutsen, Elizabeth Badolato, Wendy M Bamberg
No abstract text is available yet for this article.
December 16, 2016: MMWR. Morbidity and Mortality Weekly Report
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