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RND efflux pump

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https://www.readbyqxmd.com/read/27902383/detection-of-isaba1-in-association-with-a-novel-allelic-variant-of-the-%C3%AE-lactamase-adc-82-and-class-d-%C3%AE-lactamase-genes-mediating-carbapenem-resistance-among-the-clinical-isolates-of-mdr-a-baumannii
#1
Rajagopalan Saranathan, Rinki Kumari, Ramakrishnan Kalaivani, Sah Suresh, Anshu Rani, Shashikala Purty, Prashanth K
The objective of the present study is to investigate the diverse resistance determinants, their association with IS mobile elements and predilection of a particular clone for such associations in A. baumannii. Fifty-four consecutive isolates collected during 2011-2012 from a tertiary care hospital were subjected to susceptibility testing followed by PCR screening of commonly reported β-lactamases and 16S rRNA methyl transferase encoding genes. The integrity of RND efflux pump related genes in their respective operons was also investigated...
November 25, 2016: Journal of Medical Microbiology
https://www.readbyqxmd.com/read/27879336/beyond-antimicrobial-resistance-evidence-for-a-distinct-role-of-the-acrd-efflux-pump-in-salmonella-biology
#2
Michelle M C Buckner, Jessica M A Blair, Roberto M La Ragione, Jane Newcombe, Daniel J Dwyer, Alasdair Ivens, Laura J V Piddock
: For over 20 years, bacterial multidrug resistance (MDR) efflux pumps have been studied because of their impact on resistance to antimicrobials. However, critical questions remain, including why produce efflux pumps under non-antimicrobial treatment conditions, and why have multiple pumps if their only purpose is antimicrobial efflux? Salmonella spp. possess five efflux pump families, including the resistance-nodulation-division (RND) efflux pumps. Notably, the RND efflux pump AcrD has a unique substrate profile, distinct from other Salmonella efflux pumps...
November 22, 2016: MBio
https://www.readbyqxmd.com/read/27825482/unraveling-genomic-and-phenotypic-nature-of-multidrug-resistant-mdr-pseudomonas-aeruginosa-vrfpa04-isolated-from-keratitis-patient
#3
Murugan N, Malathi J, Umashankar V, Madhavan H N
Multidrug-resistant (MDR) Pseudomonas aeruginosa VRFPA04, obtained from a keratitis patient was found to exhibit resistance to betalactam (Penicillins, cephalosporins, including carbapenems, except aztreonam), aminoglycosides, quinolone group of drugs and susceptible to colistin. The complete genome sequencing of the ocular isolate to measure and ascertain the degree of multidrug resistance in VRFPA04 strain resulted in 6,818,030bp (6.8Mb) genome sizes, which happen to be the third largest genome available in the Genbank to date...
December 2016: Microbiological Research
https://www.readbyqxmd.com/read/27815276/genome-dynamics-and-molecular-infection-epidemiology-of-multi-drug-resistant-helicobacter-pullorum-isolates-obtained-from-broiler-and-country-chickens-in-india
#4
Shamsul Qumar, Mohammad Majid, Narender Kumar, Sumeet K Tiwari, Torsten Semmler, Savita Devi, Ramani Baddam, Arif Hussain, Sabiha Shaik, Niyaz Ahmed
: Some of the life-threatening, foodborne, and zoonotic infections are transmitted through poultry birds. Inappropriate and indiscriminate use of antimicrobials in livestock industry has led to increased prevalence of multidrug resistant bacteria of epidemic potentials. Herein, we present the functional molecular epidemiological analysis entailing phenotypic as well as whole genome sequence based characterization of eleven H. pullorum isolates from broiler and free range chickens sampled from retail wet markets of Hyderabad city in India...
November 4, 2016: Applied and Environmental Microbiology
https://www.readbyqxmd.com/read/27806930/rnd-efflux-pump-and-its-interrelationship-with-quorum-sensing-system
#5
Liang Zhibin, Chen Yumei, Chen Yufan, Cheng Yingying, Zhang Lianhui
Antibiotic resistance has become a serious concern in treatment of bacterial infections. Overexpression of efflux pump is one of the important mechanisms in antibiotic resistance. In Gram negative bacteria, RND (Resistance-nodulation-cell division) superfamily efflux pump plays a vital important role in antibiotics resistance. Recent research progress unveils an intriguing interrelationship between RND efflux pump and the bacterial quorum sensing system, whose regulation is dependent on small signal molecules...
October 20, 2016: Yi Chuan, Hereditas
https://www.readbyqxmd.com/read/27789287/effect-of-site-directed-mutations-in-multidrug-efflux-pump-acrb-examined-by-quantitative-efflux-assays
#6
Alfred D Kinana, Attilio V Vargiu, Hiroshi Nikaido
BACKGROUND: The Resistance-Nodulation-Division (RND) family transporter AcrB plays a major role in the intrinsic and increased resistance of Escherichia coli to a large number of antibiotics. The distal binding pocket within this multidrug efflux transporter is very large, but the effort to define the roles of various residues facing this pocket through site-directed mutagenesis so far involved only the determination of minimal inhibitory concentrations of drugs in mutants. METHODS: We measured in intact E...
November 25, 2016: Biochemical and Biophysical Research Communications
https://www.readbyqxmd.com/read/27764576/multidrug-efflux-pumps-and-their-role-in-antibiotic-and-antiseptic-resistance-a-pharmacodynamic-perspective
#7
Sandrine Alibert, Joannah N'gompaza Diarra, Jessica Hernandez, Aurélien Stutzmann, Marwa Fouad, Gérard Boyer, Jean-Marie Pagès
Worrying levels of bacterial resistance have been reported worldwide involving the failure of many available antibiotic treatments. Multidrug resistance (MDR) in Gram-negative bacteria is often ascribed to the presence of multiple and different resistance mechanisms in the same strain. RND efflux pumps play a major role and are an attractive target to discover new antibacterial drugs. Areas covered: This review discusses the prevalence of efflux pumps, their overexpression in clinical scenarios, their polyselectivity, their effect on the intracellular concentrations of various antibiotics associated with the alteration of the membrane permeability and their involvement in pathogenicity are discussed...
November 2, 2016: Expert Opinion on Drug Metabolism & Toxicology
https://www.readbyqxmd.com/read/27736975/cpxr-activates-mexab-oprm-efflux-pump-expression-and-enhances-antibiotic-resistance-in-both-laboratory-and-clinical-nalb-type-isolates-of-pseudomonas-aeruginosa
#8
Zhe-Xian Tian, Xue-Xian Yi, Anna Cho, Fergal O'Gara, Yi-Ping Wang
Resistance-Nodulation-Division (RND) efflux pumps are responsible for multidrug resistance in Pseudomonas aeruginosa. In this study, we demonstrate that CpxR, previously identified as a regulator of the cell envelope stress response in Escherichia coli, is directly involved in activation of expression of RND efflux pump MexAB-OprM in P. aeruginosa. A conserved CpxR binding site was identified upstream of the mexA promoter in all genome-sequenced P. aeruginosa strains. CpxR is required to enhance mexAB-oprM expression and drug resistance, in the absence of repressor MexR, in P...
October 2016: PLoS Pathogens
https://www.readbyqxmd.com/read/27645384/opening-the-channel-the-two-functional-interfaces-of-pseudomonas-aeruginosa-opmh-with-the-triclosan-efflux-pump-triabc
#9
Abigail T Ntreh, Jon W Weeks, Logan M Nickels, Helen I Zgurskaya
: TriABC-OpmH is an efflux pump from Pseudomonas aeruginosa with an unusual substrate specificity and protein composition. When overexpressed, this pump confers a high level of resistance to the biocide triclosan and the detergent SDS, which are commonly used in combinations for antimicrobial treatments. This activity requires an RND transporter (TriC), an outer membrane channel (OpmH), and two periplasmic membrane fusion proteins (TriA and TriB) with nonequivalent functions. In the active complex, TriA is responsible for the recruitment of OpmH, while TriB is responsible for stimulation of the transporter TriC...
December 1, 2016: Journal of Bacteriology
https://www.readbyqxmd.com/read/27450181/screening-of-natural-products-and-derivatives-for-identification-of-rnd-efflux-pump-inhibitors
#10
Debarati Choudhury, Anupam Das Talukdar, Pankaj Chetia, Amitabha Bhattacharjee, Manabendra Dutta Choudhury
AIM AND OBJECTIVE: Overexpression of efflux pumps belonging to the Resistance Nodulation cell Division (RND) family is the most important intrinsic resistance mechanism of Pseudomonas aeruginosa. Hence, it is imperative to identify suitable efflux pump inhibitors (EPI) that can lead to increased intracellular concentration of antibiotics by blocking the pump. This study was undertaken to identify a putative plant based efflux pump inhibitor for RND efflux pump of P. aeruginosa. MATERIAL AND METHOD: Using molecular docking approach, 328 secondary plant metabolites have been screened for their inhibitory activity against cytoplasmic exporter protein MexB of MexAB-OprM efflux pump of P...
July 20, 2016: Combinatorial Chemistry & High Throughput Screening
https://www.readbyqxmd.com/read/27332787/distribution-and-expression-of-the-ade-multidrug-efflux-systems-in-acinetobacter-baumannii-clinical-isolates
#11
Sirawit Pagdepanichkit, Chanwit Tribuddharat, Rungtip Chuanchuen
One hundred Acinetobacter baumannii clinical isolates were examined for inhibitory effect of reserpine and carbonyl cyanide m-chlorophenylhydrazone (CCCP) on the antimicrobial susceptibility and expression of 4 resistant-nodulation-cell division (RND)-type multidrug efflux systems, including AdeABC, AdeDE, AdeIJK, and AdeFGH, using RT-PCR. Ten A. baumannii isolates expressing AdeABC, AdeIJK, or AdeFGH were randomly selected for determination of transcription level and regulatory mutations. While all the isolates were resistant to multiple drugs, the reserpine and CCCP experiment showed that the multidrug resistance phenotype in most A...
September 2016: Canadian Journal of Microbiology
https://www.readbyqxmd.com/read/27256586/current-perspectives-on-tigecycline-resistance-in-enterobacteriaceae-susceptibility-testing-issues-and-mechanisms-of-resistance
#12
REVIEW
Spyros Pournaras, Vasiliki Koumaki, Nicholas Spanakis, Vasiliki Gennimata, Athanassios Tsakris
During the past decades, rates of multidrug-resistant (MDR) and carbapenem-resistant (CR) Enterobacteriaceae clinical isolates, mainly Klebsiella spp., Escherichia coli, Enterobacter spp., Proteus spp. and Serratia marcescens, have increased, considerably restricting effective antimicrobial treatments. Tigecycline, the first member of the glycylcyclines, has been approved by the US Food and Drug Administration (FDA) for the treatment of complicated skin and soft-tissue, complicated intra-abdominal and community-acquired bacterial respiratory infections and is increasingly administered against MDR Enterobacteriaceae...
July 2016: International Journal of Antimicrobial Agents
https://www.readbyqxmd.com/read/27247231/contribution-of-the-ade-resistance-nodulation-cell-division-type-efflux-pumps-to-fitness-and-pathogenesis-of-acinetobacter-baumannii
#13
Eun-Jeong Yoon, Viviane Balloy, Laurence Fiette, Michel Chignard, Patrice Courvalin, Catherine Grillot-Courvalin
UNLABELLED: Overexpression of chromosomal resistance-nodulation-cell division (RND)-type efflux systems with broad substrate specificity contributes to multidrug resistance (MDR) in Acinetobacter baumannii We have shown that modulation of expression of the structural genes for the efflux systems AdeABC and AdeIJK confers MDR and results in numerous alterations of membrane-associated cellular functions, in particular biofilm formation. However, the contribution of these RND pumps to cell fitness and virulence has not yet been studied...
2016: MBio
https://www.readbyqxmd.com/read/27232955/optimization-of-a-novel-series-of-pyranopyridine-rnd-efflux-pump-inhibitors
#14
REVIEW
Zachary Aron, Timothy J Opperman
The rise of multidrug resistant (MDR) Gram-negative pathogens complicates our ability to treat bacterial infections with antibiotics. MDR efflux pumps play a major role in the acquisition and expression of the MDR phenotype. The major MDR efflux pumps in Gram-negative pathogens are the resistance-nodulation-division (RND) superfamily pumps. Efflux pump inhibitors (EPIs) that target RND superfamily pumps could play an important role in the clinic as an adjunctive therapy to increase antibiotic efficacy, decrease resistance, and attenuate virulence in Gram-negative pathogens...
October 2016: Current Opinion in Microbiology
https://www.readbyqxmd.com/read/27190287/resistance-nodulation-division-efflux-pump-acrab-is-modulated-by-florfenicol-and-contributes-to-drug-resistance-in-the-fish-pathogen-piscirickettsia-salmonis
#15
Rodrigo Sandoval, Cristian Oliver, Sharin Valdivia, Karla Valenzuela, Ronie E Haro, Patricio Sánchez, Víctor H Olavarría, Paulina Valenzuela, Rubén Avendaño-Herrera, Alex Romero, Juan G Cárcamo, Jaime E Figueroa, Alejandro J Yáñez
Piscirickettsia salmonis is a fastidious intracellular pathogen responsible for high mortality rates in farmed salmonids, with serious economic consequences for the Chilean aquaculture industry. Oxytetracycline and florfenicol are the most frequently used antibiotics against P. salmonis, but routine use could contribute to drug resistance. This study identified differentiated florfenicol susceptibilities in two P. salmonis strains, LF-89 and AUSTRAL-005. The less susceptible isolate, AUSTRAL-005, also showed a high ethidium bromide efflux rate, indicating a higher activity of general efflux pump genes than LF-89...
June 2016: FEMS Microbiology Letters
https://www.readbyqxmd.com/read/27161641/evidence-of-a-substrate-discriminating-entrance-channel-in-the-lower-porter-domain-of-the-multidrug-resistance-efflux-pump-acrb
#16
Sabine Schuster, Martina Vavra, Winfried V Kern
Efflux pumps of the resistance nodulation cell division (RND) transporter family, such as AcrB of Escherichia coli, play an important role in the development of multidrug resistance, but the molecular basis for their substrate promiscuity is not yet completely understood. From a collection of highly clarithromycin-resistant AcrB periplasmic domain mutants derived from in vitro random mutagenesis, we identified variants with an unusually altered drug resistance pattern characterized by increased susceptibility to many drugs of lower molecular weight, including fluoroquinolones, tetracyclines, and oxazolidinones, but unchanged or increased resistance to drugs of higher molecular weight, including macrolides...
July 2016: Antimicrobial Agents and Chemotherapy
https://www.readbyqxmd.com/read/27065229/response-to-gaseous-no2-air-pollutant-of-p-fluorescens-airborne-strain-mfaf76a-and-clinical-strain-mfn1032
#17
Tatiana Kondakova, Chloé Catovic, Magalie Barreau, Michael Nusser, Gerald Brenner-Weiss, Sylvie Chevalier, Frédéric Dionnet, Nicole Orange, Cécile Duclairoir Poc
Human exposure to nitrogen dioxide (NO2), an air pollutant of increasing interest in biology, results in several toxic effects to human health and also to the air microbiota. The aim of this study was to investigate the bacterial response to gaseous NO2. Two Pseudomonas fluorescens strains, namely the airborne strain MFAF76a and the clinical strain MFN1032 were exposed to 0.1, 5, or 45 ppm concentrations of NO2, and their effects on bacteria were evaluated in terms of motility, biofilm formation, antibiotic resistance, as well as expression of several chosen target genes...
2016: Frontiers in Microbiology
https://www.readbyqxmd.com/read/27062479/effects-of-secdf-on-the-antimicrobial-functions-of-cathelicidins-against-staphylococcus-aureus
#18
Stefanie Blodkamp, Kristina Kadlec, Thomas Gutsmann, Chantal Quiblier, Hassan Y Naim, Stefan Schwarz, Maren von Köckritz-Blickwede
Antimicrobial peptides (AMPs) represent an important part of the innate host immune system. Although they are active against a broad range of pathogens, bacteria have evolved different resistance mechanisms to avoid killing by AMPs. Since not much is known about the impact of efflux pumps on the susceptibility of Gram-positive bacteria to AMPs, especially to the cathelicidins, the aim of this study was to analyze whether Staphylococcus aureus can use efflux pumps to resist the antimicrobial effects of cathelicidins derived from different animal species (human, mouse, rabbit or cattle)...
March 31, 2016: Veterinary Microbiology
https://www.readbyqxmd.com/read/27045078/computer-simulations-suggest-direct-and-stable-tip-to-tip-interaction-between-the-outer-membrane-channel-tolc-and-the-isolated-docking-domain-of-the-multidrug-rnd-efflux-transporter-acrb
#19
Thomas H Schmidt, Martin Raunest, Nadine Fischer, Dirk Reith, Christian Kandt
One way by which bacteria achieve antibiotics resistance is preventing drug access to its target molecule for example through an overproduction of multi-drug efflux pumps of the resistance nodulation division (RND) protein super family of which AcrAB-TolC in Escherichia coli is a prominent example. Although representing one of the best studied efflux systems, the question of how AcrB and TolC interact is still unclear as the available experimental data suggest that either both proteins interact in a tip to tip manner or do not interact at all but are instead connected by a hexamer of AcrA molecules...
July 2016: Biochimica et Biophysica Acta
https://www.readbyqxmd.com/read/27003800/global-pattern-of-gene-expression-of-xanthomonas-axonopodis-pv-glycines-within-soybean-leaves
#20
Tiyakhon Chatnaparat, Sutruedee Prathuangwong, Steven E Lindow
To better understand the behavior of Xanthomonas axonopodis pv. glycines, the causal agent of bacterial pustule of soybean within its host, its global transcriptome within soybean leaves was compared with that in a minimal medium in vitro, using deep sequencing of mRNA. Of 5,062 genes predicted from a draft genome of X. axonopodis pv. glycines, 534 were up-regulated in the plant, while 289 were down-regulated. Genes encoding YapH, a cell-surface adhesin, as well as several others encoding cell-surface proteins, were down-regulated in soybean...
June 2016: Molecular Plant-microbe Interactions: MPMI
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