Characterization of the Genetic Background of KPC-2-Producing Klebsiella pneumoniae with Insertion Elements Disrupting the ompK36 Porin Gene

2020 ◽  
Vol 26 (9) ◽  
pp. 1050-1057 ◽  
Author(s):  
Lii-Tzu Wu ◽  
Ming-Kai Guo ◽  
Se-Chin Ke ◽  
Yi-Pei Lin ◽  
Yi-Chun Pang ◽  
...  
Keyword(s):  
Klebsiella Pneumoniae ◽  
Genetic Background ◽  
Insertion Elements

scholarly journals Molecular characterization of KPC-2-producing Klebsiella pneumoniae ST258 isolated from bovine mastitis

2021 ◽  
Author(s):  
Jesús Silva-Sanchez ◽  
Humberto Barrios-Camacho ◽  
Emmanuel Hernández-Rodriguez ◽  
Josefina Duran-Bedolla ◽  
Alejandro Sanchez-Perez ◽  
...  
Keyword(s):  
Klebsiella Pneumoniae ◽  
Molecular Characterization ◽  
Bovine Mastitis

scholarly journals Lemierre’s syndrome associated with hypervirulent Klebsiella pneumoniae: A case report and genomic characterization of the isolate

IDCases ◽  
2021 ◽  
pp. e01173
Author(s):  
Seung Eun Lee ◽  
Ammara Mushtaq ◽  
Melissa Gitman ◽  
Alberto Paniz-Mondolfi ◽  
Marilyn Chung ◽  
...  
Keyword(s):  
Case Report ◽  
Klebsiella Pneumoniae ◽  
Lemierre’S Syndrome ◽  
Genomic Characterization ◽  
Lemierre's Syndrome

Characterization of multidrug-resistant and virulent Klebsiella pneumoniae strains belonging to the high-risk clonal group 258 (CG258) isolated from inpatients in northeastern Brazil

2021 ◽  
Author(s):  
Rafael Nakamura-Silva ◽  
Mariana Oliveira-Silva ◽  
João Pedro Rueda Furlan ◽  
Eliana Guedes Stehling ◽  
Carlos Eduardo Saraiva Miranda ◽  
...  
Keyword(s):  
High Risk ◽  
Klebsiella Pneumoniae ◽  
Multidrug Resistant ◽  
Northeastern Brazil ◽  
Clonal Group

scholarly journals Characterization of RarA, a Novel AraC Family Multidrug Resistance Regulator in Klebsiella pneumoniae

2012 ◽  
Vol 56 (8) ◽  
pp. 4450-4458 ◽  
Author(s):  
Mark Veleba ◽  
Paul G. Higgins ◽  
Gerardo Gonzalez ◽  
Harald Seifert ◽  
Thamarai Schneiders
Keyword(s):  
Multidrug Resistance ◽  
Klebsiella Pneumoniae ◽  
Efflux Pump ◽  
Content Type ◽  
Resistance Phenotype ◽  
Serratia Proteamaculans ◽  
Virulence Potential ◽  
Article Type ◽  
Acrab Efflux Pump

ABSTRACTTranscriptional regulators, such as SoxS, RamA, MarA, and Rob, which upregulate the AcrAB efflux pump, have been shown to be associated with multidrug resistance in clinically relevant Gram-negative bacteria. In addition to the multidrug resistance phenotype, these regulators have also been shown to play a role in the cellular metabolism and possibly the virulence potential of microbial cells. As such, the increased expression of these proteins is likely to cause pleiotropic phenotypes.Klebsiella pneumoniaeis a major nosocomial pathogen which can express the SoxS, MarA, Rob, and RamA proteins, and the accompanying paper shows that the increased transcription oframAis associated with tigecycline resistance (M. Veleba and T. Schneiders, Antimicrob. Agents Chemother. 56:4466–4467, 2012). Bioinformatic analyses of the availableKlebsiellagenome sequences show that an additional AraC-type regulator is encoded chromosomally. In this work, we characterize this novel AraC-type regulator, hereby called RarA (Regulator of antibiotic resistance A), which is encoded inK. pneumoniae,Enterobactersp. 638,Serratia proteamaculans568, andEnterobacter cloacae. We show that the overexpression ofrarAresults in a multidrug resistance phenotype which requires a functional AcrAB efflux pump but is independent of the other AraC regulators. Quantitative real-time PCR experiments show thatrarA(MGH 78578 KPN_02968) and its neighboring efflux pump operonoqxAB(KPN_02969_02970) are consistently upregulated in clinical isolates collected from various geographical locations (Chile, Turkey, and Germany). Our results suggest thatrarAoverexpression upregulates theoqxABefflux pump. Additionally, it appears thatoqxR, encoding a GntR-type regulator adjacent to theoqxABoperon, is able to downregulate the expression of theoqxABefflux pump, where OqxR complementation resulted in reductions to olaquindox MICs.

scholarly journals Characterization of extended-spectrum β-lactamase-producing Escherichia coli and Klebsiella pneumoniae isolates from the community in Morocco

2011 ◽  
Vol 60 (9) ◽  
pp. 1344-1352 ◽  
Author(s):  
Abouddihaj Barguigua ◽  
Fatima El Otmani ◽  
Mustapha Talmi ◽  
Fatna Bourjilat ◽  
Fatima Haouzane ◽  
...  
Keyword(s):  
Escherichia Coli ◽  
Klebsiella Pneumoniae ◽  
Extended Spectrum
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