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https://www.readbyqxmd.com/read/29784851/replacement-by-site-saturation-mutagenesis-of-residue-119-in-ndm-1-metallo-%C3%AE-lactamase-a-kinetic-study
#1
Francesca Marcoccia, Paola Sandra Mercuri, Moreno Galleni, Giuseppe Celenza, Gianfranco Amicosante, Mariagrazia Perilli
NDM-1 is a subclass B1 metallo-β-lactamase which exhibits a broad activity spectrum against β-lactam antibiotics. In this study we report the kinetic study of six Q119X variants obtained by site-directed mutagenesis on NDM-1. All Q119X variants were able to hydrolyze very efficiently carbapenems, penicillins and 1st , 2nd , 3rd and 4th generation cephalosporins. In particular, Q119E, Q119Y, Q119V and Q119K mutants showed an improvement of kcat/ Km towards penicillins respect to NDM-1. The catalytic efficiency of Q119K variant is about 65- and 70-fold higher than that of NDM-1 for benzylpenicillin and carbenicillin, respectively...
May 21, 2018: Antimicrobial Agents and Chemotherapy
https://www.readbyqxmd.com/read/29778048/pathogens-constancy-harbinger-of-nosocomial-infection-cum-identification-of-resistant-genes-and-drug-designing
#2
Sana Farooq Ahmad, Ibrar Khan, Abdul Wadood, Sadiq Azam, Noor Rehman, Muhammad Waqas, Kashif Bashir, Asaf Ali Khan
Hospitals are the most prominent places for the growth and spread of bacteria which are resistant to the available antibiotics. This antibiotic resistance is due to the over and misuse of antibiotic dosages of a high-density of patient population which are in frequent interaction with inanimate items of the hospitals and the consequent risk of cross infection. Out of 1010 samples of the current study, 510 (50.49%) were culture positive of which 329 (64.5%) were Gram-positive while 181 (35.49%) Gram negative...
April 22, 2018: Computational Biology and Chemistry
https://www.readbyqxmd.com/read/29776709/rapid-real-time-pcr-for-the-detection-of-imp-ndm-vim-kpc-and-oxa-48-carbapenemase-genes-in-isolates-and-spiked-stool-samples
#3
Marianne Lund, Marianne Bøgild Petersen, Anders Lægaard Jørgensen, Dorte Paulmann, Mikala Wang
An in-house real-time PCR was developed to detect the carbapenemase genes IMP, NDM, VIM, KPC and OXA-48 from both bacterial colonies and directly from fecal material. The assay is a multiplex PCR performed in two tubes with NDM, VIM and IMP genes detected in one tube and OXA-48 and KPC genes in the other. Despite the large amount of primers and probes necessary to cover all variants of especially the VIM and IMP genes, the efficiency of the PCR reactions was from 95 to 100%. When tested on 170 clinical strains and compared to culture results from a reference laboratory, 100% correspondence was found...
April 13, 2018: Diagnostic Microbiology and Infectious Disease
https://www.readbyqxmd.com/read/29775789/e-coli-encoding-blandm-5-associated-with-community-acquired-uti-cases-with-unusual-mic-creep-like-phenomenon-against-imipenem
#4
Varsha Rani Gajamer, Amitabha Bhattacharjee, Deepjyoti Paul, Chandrayee Deshamukhya, Ashish Kr Singh, Nilu Pradhan, Hare Krishna Tiwari
OBJECTIVES: Carbapenemase-producing Escherichia coli are of major clinical concern. The present study aimed to identify NDM-5 producing E.coli associated with community-acquired urinary tract infection, co-harboring ESBL genes and a pattern of imipenem MIC creep. METHODS: A total of 973 urine samples were collected from females of age between 18-49 diagnosed with UTI. Isolates were identified by standard microbiological procedures. Presence of blaNDM and ESBL genes was determined by PCR assay and sequencing...
May 15, 2018: Journal of Global Antimicrobial Resistance
https://www.readbyqxmd.com/read/29774858/genomic-epidemiology-of-global-carbapenemase-producing-enterobacter-spp-2008-2014
#5
Gisele Peirano, Yasufumi Matsumura, Mark D Adams, Patricia Bradford, Mary Motyl, Liang Chen, Barry N Kreiswirth, Johann D D Pitout
We performed whole-genome sequencing on 170 clinical carbapenemase-producing Enterobacter spp. isolates collected globally during 2008-2014. The most common carbapenemase was VIM, followed by New Delhi metallo-β-lactamase (NDM), Klebsiella pneumoniae carbapenemase, oxacillin 48, and IMP. The isolates were of predominantly 2 species (E. xiangfangensis and E. hormaechei subsp. steigerwaltii) and 4 global clones (sequence type [ST] 114, ST93, ST90, and ST78) with different clades within ST114 and ST90. Particular genetic structures surrounding carbapenemase genes were circulating locally in various institutions within the same or between different STs in Greece, Guatemala, Italy, Spain, Serbia, and Vietnam...
June 2018: Emerging Infectious Diseases
https://www.readbyqxmd.com/read/29768625/detection-of-blandm-1-in-stenotrophomonas-maltophilia-isolated-from-brazilian-soil
#6
João Pedro Rueda Furlan, André Pitondo-Silva, Eliana Guedes Stehling
This study reports the presence of the blaNDM-1 gene in an isolate of Stenotrophomonas maltophilia obtained from a Brazilian soil, inside an IncA/C plasmid with ~ 45 Kb. To the best of our knowledge, this is the second report in the world and the first in Brazil of NDM-producing bacterium isolated from soil.
May 14, 2018: Memórias do Instituto Oswaldo Cruz
https://www.readbyqxmd.com/read/29766516/radiographic-bone-loss-in-a-scottish-non-smoking-type-1-diabetes-mellitus-population-a-bitewing-radiographic-study
#7
Anastasios Plessas, Douglas P Robertson, Penny J Hodge
BACKGROUND: The dental complications of uncontrolled diabetes include reduced salivary flow rate, candidiasis and periodontal manifestations. A recent meta-analysis concluded that diabetes patients have a significantly higher severity, but not extent, of destructive periodontal disease than non-diabetes people. The authors reported that most type-1 diabetes studies using dental radiographic data have not controlled for confounding factors such as smoking. The aim of this cross-sectional study was to compare radiographic alveolar bone loss between type 1 diabetes (T1DM) and non-diabetes (NDM) participants in a Scottish non-smoking population...
May 15, 2018: Journal of Periodontology
https://www.readbyqxmd.com/read/29763630/clinical-and-molecular-epidemiologic-characteristics-of-carbapenem-resistant-klebsiella-pneumoniae-infection-colonization-among-neonates-in-china
#8
Dandan Yin, Lei Zhang, Aimin Wang, Leiyan He, Yun Cao, Fupin Hu, Chuanqing Wang
BACKGROUND: The spread of carbapenem-resistant Klebsiella pneumoniae (CR-KPN) is a major concern, but data on CR-KPN infection/colonization in paediatric populations are limited. AIM: This study aimed to analyze epidemiologic and clinical characteristics, therapeutic options of CR-KPN infections in neonates in China. METHODS: A retrospective study was performed at the Children's Hospital of Fudan University, including 88 neonates with CR-KPN admitted between November 2015 and October 2016...
May 12, 2018: Journal of Hospital Infection
https://www.readbyqxmd.com/read/29762125/anomalous-mobility-of-a-driven-active-particle-in-a-steady-laminar-flow
#9
Fabio Cecconi, Andrea Puglisi, Alessandro Sarracino, Angelo Vulpiani
We study, via extensive numerical simulations, the force-velocity
 curve of an active particle advected by a steady laminar flow, in the
 nonlinear response regime. Our model for an active particle relies on
 a colored noise term that mimics its persistent motion over a time
 scale τ<sub>Α</sub>. We find that the active particle dynamics shows
 non-trivial effects, such as negative differential and absolute
 mobility (NDM and ANM, respectively)...
May 15, 2018: Journal of Physics. Condensed Matter: An Institute of Physics Journal
https://www.readbyqxmd.com/read/29760145/-in-vitro-activity-of-imipenem-relebactam-and-ceftolozane-tazobactam-against-resistant-gram-negative-bacilli
#10
Suzannah M Schmidt-Malan, Avisya J Mishra, Ammara Mushtaq, Cassandra L Brinkman, Robin Patel
Understanding which antimicrobial agents are likely to be active against Gram-negative bacilli can guide selection of antimicrobials for empiric therapy as mechanistic-based (i.e., molecular) rapid diagnostics are adopted. Here, we determined the MICs of the novel β-lactam/β-lactamase inhibitor combination, imipenem-relebactam, along with ceftolozane-tazobactam, imipenem, ertapenem, meropenem, ceftriaxone, and cefepime, against 283 multidrug resistant isolates of Gram-negative bacilli. For isolates harboring bla KPC (n=111), the addition of relebactam to imipenem lowered the MIC50 /MIC90 from 16/>128 μg/ml for imipenem alone to 0...
May 14, 2018: Antimicrobial Agents and Chemotherapy
https://www.readbyqxmd.com/read/29760136/aztreonam-avibactam-combination-restores-susceptibility-of-aztreonam-in-dual-carbapenemase-producing-enterobacteriaceae
#11
Ka Lip Chew, Michelle K L Tay, Bernadette Cheng, Raymond T P Lin, Sophie Octavia, Jeanette W P Teo
Newly approved Food and Drug Administration (FDA) β-lactam-β-lactamase inhibitor (βL-βLI) inhibitor combinations such as ceftazidime-avibactam and meropenem-vaborbactam are potent inhibitors of class A carbapenemase (typified by KPC [ Klebsiella pneumoniae carbapenemase]-like) (1, 2) but are ineffective against carbapenemase-producing Enterobacteriaceae (CPE) producing class B metallo-β-lactamases (MβLs) such as New Delhi metallo-β-lactamase (NDM) (1-4).….
May 14, 2018: Antimicrobial Agents and Chemotherapy
https://www.readbyqxmd.com/read/29749367/use-of-succinic-oxalic-acid-in-reducing-the-dosage-of-colistin-against-new-delhi-metallo-%C3%AE-lactamase-1-bacteria
#12
Ravichandiran Kumar, Brinda Chandar, Madasamy Parani
Background & objectives: New Delhi metallo-β-lactamase 1 (NDM-1) cleaves the beta-lactam ring, and confers bacterial resistance against most of the beta-lactam antibiotics, except tigecycline and colistin. Among these two antibiotics, colistin is considered toxic, and therefore, its clinical use and dosage need cautious approach. In the present study, six organic acids were screened individually and in combination of two acids for their effectiveness against NDM-1 Escherichia coli and a combination of colistin and oxalic or succinic acid was tested to find out the potential of combination therapy for reducing the dose of toxic colistin...
January 2018: Indian Journal of Medical Research
https://www.readbyqxmd.com/read/29749296/molecular-and-computational-approaches-to-understand-resistance-of-new-delhi-metallo-%C3%AE-lactamase-variants-ndm-1-ndm-4-ndm-5-ndm-6-ndm-7-producing-strains-against-carbapenems
#13
Abid Ali, Divya Gupta, Gaurava Srivastava, Ashok Sharma, Asad U Khan
The discovery of NDM-1 and its variants has caused the emergence of antibiotic resistance in the community and hospital setting, causing major concern for health care across the globe. New Delhi Metallo-β-lactamase is known to hydrolyze almost all β-lactam antibiotics. Studies have shown the hydrolytic activates of NDM-1 and some of its variants, however a comparative study of these NDM variants has not been explored in detail. Hence, we proposed to check their catalytic activity by performing a comparative study between NDM-1 and its variants...
May 11, 2018: Journal of Biomolecular Structure & Dynamics
https://www.readbyqxmd.com/read/29744043/genome-based-analysis-of-carbapenemase-producing-klebsiella-pneumoniae-isolates-from-german-hospital-patients-2008-2014
#14
Laura Becker, Martin Kaase, Yvonne Pfeifer, Stephan Fuchs, Annicka Reuss, Anja von Laer, Muna Abu Sin, Miriam Korte-Berwanger, Sören Gatermann, Guido Werner
Background: By using whole genome sequence data we aimed at describing a population snapshot of carbapenemase-producing K. pneumoniae isolated from hospitalized patients in Germany between 2008 and 2014. Methods: We selected a representative subset of 107 carbapenemase-producing K. pneumoniae clinical isolates possessing the four most prevalent carbapenemase types in Germany (KPC-2, KPC-3, OXA-48, NDM-1). Isolates were processed via illumina NGS. Data were analysed using different SNP-based mapping and de-novo assembly approaches...
2018: Antimicrobial Resistance and Infection Control
https://www.readbyqxmd.com/read/29739004/detection-of-antibiotic-resistance-determinants-and-their-transmissibility-among-clinically-isolated-carbapenem-resistant-escherichia-coli-from-south-india
#15
Niranjana Mahalingam, Bhavani Manivannan, Balaram Khamari, Shivakumara Siddaramappa, Sudeshna Adak, Eswarappa Pradeep Bulagonda
OBJECTIVES: The aim of this study was to analyze the prevalence of CTX-M, TEM, SHV, VIM, NDM and OXA genes in carbapenemase-producing E. coli and their transmissibility at a tertiary care hospital in south India. MATERIALS AND METHODS: Twenty-one carbapenem-resistant E. coli (CRE) were collected from Sri Sathya Sai Institute of Higher Medical Sciences, Prasanthigram, India. Resistance to antibiotics was analyzed by Vitek-2, and identity of the isolates was confirmed by 16S rDNA sequencing...
May 8, 2018: Medical Principles and Practice: International Journal of the Kuwait University, Health Science Centre
https://www.readbyqxmd.com/read/29734581/water-use-intensity-of-canadian-beef-production-in-1981-as-compared-to-2011
#16
Getahun Legesse, Marcos R C Cordeiro, Kim H Ominski, Karen A Beauchemin, Roland Kroebel, Emma J McGeough, Sarah Pogue, Tim A McAllister
The amount of beef produced per animal in Canada increased significantly from 1981 to 2011, due to enhanced production efficiency and increased carcass weight. This study examined the impact of improvements in production efficiency on water use intensity over this period. Temporal and regional differences in cattle categories, water use for drinking, feed production and meat processing, feeding systems, average daily gains, and carcass weight were considered in the analysis. Potential evapotranspiration (PET) was estimated by the National Drought Model (NDM) from 679 weather stations across Canada using the Priestley and Taylor equation...
April 1, 2018: Science of the Total Environment
https://www.readbyqxmd.com/read/29728111/emergence-of-multidrug-resistant-providencia-rettgeri-isolates-co-producing-ndm-1-carbapenemase-and-per-1-extended-spectrum-%C3%AE-lactamase-causing-a-first-outbreak-in-korea
#17
Saeam Shin, Seok Hoon Jeong, Hyukmin Lee, Jun Sung Hong, Min-Jeong Park, Wonkeun Song
BACKGROUND: Nosocomial outbreak due to carbapenem-resistant Enterobacteriaceae has become serious challenge to patient treatment and infection control. We describe an outbreak due to a multidrug-resistant Providencia rettgeri from January 2016 to January 2017 at a University Hospital in Seoul, Korea. METHODS: A total of eight non-duplicate P. rettgeri isolates were discovered from urine samples from eight patients having a urinary catheter and admitted in a surgical intensive care unit...
May 5, 2018: Annals of Clinical Microbiology and Antimicrobials
https://www.readbyqxmd.com/read/29727717/coexistence-of-ndm-1-producing-escherichia-coli-and-citrobacter-freundii-in-the-same-patient
#18
Bo Zhu, Chaoqun Ying, Hao Xu, Jingjing Ying
OBJECTIVES: Although blaNDM-1 has now been widely detected in various Enterobacteriaceae clinical isolates, multiple blaNDM-1 colonizations within the same patient remain rare. The aim of the study was to describe a patient with respiratory tract colonization of NDM-1-producing Escherichia coli and Citrobacter freundii during a hospitalization in China. METHODS: Two carbapenem-resistant isolates were analysed. Susceptibility testing, metallo-β-lactamase production, conjugation, plasmid analysis, and molecular typing were performed...
May 1, 2018: Journal of Global Antimicrobial Resistance
https://www.readbyqxmd.com/read/29726706/-i-hibiscus-sabdariffa-i-roselle-polyphenol-rich-extract-averts-cardiac-functional-and-structural-abnormalities-in-type-1-diabetic-rats
#19
Nur Liyana Mohammed Yusof, Satirah Zainalabidin, Norsyahida Mohd Fauzi, Siti Balkis Budin
Diabetes mellitus is often associated with cardiac functional and structural alteration, an initial event leading to cardiovascular complications. <i>Hibiscus sabdariffa</i> or roselle has been widely proven as an antioxidant and recently has incited research interest for its potential in treating cardiovascular disease. Therefore, this study aimed to determine the cardioprotective effects of <i>H. sabdariffa </i>(roselle) polyphenol-rich extract (HPE) in type-1 induced diabetic rats...
May 4, 2018: Applied Physiology, Nutrition, and Metabolism, Physiologie Appliquée, Nutrition et Métabolisme
https://www.readbyqxmd.com/read/29726673/vancomycin-analogue-restores-meropenem-activity-against-ndm-1-gram-negative-pathogens
#20
Venkateswarlu Yarlagadda, Paramita Sarkar, Sandip Samaddar, Goutham Belagula Manjunath, Susweta Das Mitra, Krishnamoorthy Paramanandham, Bibek R Shome, Jayanta Haldar
New Delhi Metallo-β-lactamase-1 (NDM-1) is the major contributor to the emergence of carbapenem-resistance in Gram-negative pathogens (GNPs) and has caused many clinically available β-lactam antibiotics to become obsolete. A clinically approved inhibitor of metallo-β-lactamase (MBL) that could restore the activity of carbapenems against resistant GNPs has not yet been found, making NDM-1 a serious threat to human health. Here, we have rationally developed an inhibitor for the NDM-1 enzyme, which has the ability to penetrate the outer membrane of GNPs and inactivate the enzyme by depleting the metal ion (Zn2+) from the active site...
May 4, 2018: ACS Infectious Diseases
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