In the present study, bacterial isolates were screened for arsenic resistance efficiency. Environmental isolates were isolated from arsenic-rich soil samples (i.e., from Rajnandgaon district of Chhattisgarh state, India). Amplification and sequencing of 16S rRNA gene revealed that the isolates were of Bacillus firmus RSN1, Brevibacterium senegalense RSN2, Enterobacter cloacae RSN3, Stenotrophomonas pavanii RSN6, Achromobacter mucicolens RSN7, and Ochrobactrum intermedium RSN10. Arsenite efflux gene (arsB) was successfully amplified in E. cloacae RSN3. Atomic absorption spectroscopy (AAS) analysis showed an absorption of 32.22% arsenic by the RSN3 strain. Furthermore, results of scanning electron microscopy (SEM) for morphological variations revealed an initial increase in the cell size at 1 mM sodium arsenate; however, it was decreased at 10 mM concentration in comparison to control. This change of the cell size in different metal concentrations was due to the uptake and expulsion of the metal from the cell, which also confirmed the arsenite efflux system.
Oxacillinases (OXA) have been mostly described in Enterobacteriaceae, Acinetobacter, and Pseudomonas species. Recent years have witnessed an increased prevalence of intrinsic and/or acquired β-lactamase-producing Acinetobacter in food-producing animals. This study was conducted to assess the prevalence of OXA among selected bacterial species and to characterize these enzymes by in silico analysis. Screening of OXA was performed by PCR amplification using specific pairs of oligonucleotides. Overall, 40 pairs of primers were designed, of which 6 were experimentally tested in vitro. Among 49 bacterial isolates examined, the presence of blaOXA-1-like genes was confirmed in 20 cases (41%; 19 times in Klebsiella pneumoniae and once in Enterobacter cloacae). No OXA were found in animal isolates. The study results confirmed the specificity of the designed oligonucleotide pairs. Furthermore, the designed primers were found to possess the ability to specifically detect 90.2% of all OXA. These facts suggest that the in silico and in vitro tested primers could be used for single or multiplex PCR to screen for the presence of OXA in various bacteria, as well as to monitor their spread. At the same time, the presence of conserved characteristic amino acids and motifs was confirmed by in silico analysis of sequences of representative members of OXA.
- MeSH
- antibakteriální látky farmakologie MeSH
- bakteriální proteiny genetika metabolismus MeSH
- beta-laktamasy genetika metabolismus MeSH
- DNA primery chemická syntéza metabolismus MeSH
- Enterobacter cloacae klasifikace účinky léků enzymologie genetika MeSH
- Escherichia coli klasifikace účinky léků enzymologie genetika MeSH
- exprese genu MeSH
- fylogeneze MeSH
- gramnegativní bakteriální infekce diagnóza epidemiologie mikrobiologie veterinární MeSH
- Klebsiella pneumoniae klasifikace účinky léků enzymologie genetika MeSH
- kur domácí mikrobiologie MeSH
- lidé MeSH
- maso mikrobiologie MeSH
- mikrobiální testy citlivosti MeSH
- multiplexová polymerázová řetězová reakce metody MeSH
- peniciliny farmakologie MeSH
- zvířata MeSH
- Check Tag
- lidé MeSH
- zvířata MeSH
- Publikační typ
- časopisecké články MeSH
- Geografické názvy
- Česká republika MeSH
ST252 Enterobacter cloacae, producing GES-5 carbapenemase, was isolated in a Czech hospital. blaGES-5was part of a novel class 1 integron, In1406, which also included a new allele of the aadA15 gene cassette. In1406 was located on a ColE2-like plasmid, pEcl-35771cz (6953bp).
- MeSH
- bakteriální proteiny genetika MeSH
- beta-laktamasy genetika MeSH
- Enterobacter cloacae enzymologie genetika MeSH
- enterobakteriální infekce mikrobiologie MeSH
- integrony genetika MeSH
- lidé MeSH
- multilokusová sekvenční typizace MeSH
- nemocnice MeSH
- Check Tag
- lidé MeSH
- Publikační typ
- časopisecké články MeSH
- Geografické názvy
- Česká republika MeSH
A VIM-1-producing ST92 Enterobacter cloacae was isolated in a Czech hospital. blaVIM-1 was part of the class 1 integron In110 carried by a Tn1721-like transposon. Tn1721-like was located on a ColE1-like plasmid, pEncl-30969cz (33,003 bp). Target site duplications at the boundaries of Tn1721-like suggested its transposition into the pEncl-30969cz backbone.
- MeSH
- antibakteriální látky farmakologie MeSH
- bakteriální proteiny genetika MeSH
- beta-laktamasy genetika MeSH
- beta-laktamová rezistence genetika MeSH
- DNA bakterií analýza genetika MeSH
- Enterobacter cloacae genetika MeSH
- enterobakteriální infekce mikrobiologie MeSH
- integrony genetika MeSH
- lidé MeSH
- mikrobiální testy citlivosti MeSH
- plazmidy genetika MeSH
- Check Tag
- lidé MeSH
- Publikační typ
- časopisecké články MeSH
The complete nucleotide sequences of three multidrug resistance (MDR) IncA/C-like plasmids from Enterobacteriaceae isolates carrying the VIM-type carbapenemase-encoding integrons In4863 (blaVIM-19-aacA7-dfrA1-ΔaadA1-smr2) or In4873 (blaVIM-1-aacA7-dfrA1-ΔaadA1-smr2) were determined, which are the first In416-like elements identified in Greece. Plasmids pKP-Gr642 and pKP-Gr8143 were from Klebsiella pneumoniae ST383 isolates, whereas plasmid pEcl-Gr4873 was from an Enterobacter cloacae ST88 isolate. Sequencing showed that pKP-Gr642 (162787bp) and pKP-Gr8143 (154395bp) consisted of the type 1 IncA/C2 conserved backbone, the blaCMY-2-like gene-containing region, and the ARI-B (with the sul2 gene) and ARI-A (with a class 1 integron) resistance islands, like the plasmid pUMNK88_161 from the USA. The third plasmid, pEcl-Gr4873 (153958bp), exhibited extensive similarity with the type 2 IncA/C2 plasmid pR55 from France. pEcl-Gr4873 carried only one resistance island of a hybrid transposon structure inserted in a different location to ARI-A in type 1 A/C2 plasmids. In all three plasmids, the In416-like integrons In4863 or In4873 were identified within non-identical class II transposon structures. All three In416-like-carrying regions presented significant similarities with the MDR region of the IncA/C2 plasmid pCC416 from Italy, carrying the prototype In416 integron (blaVIM-4-aacA7-dfrA1-ΔaadA1-smr2). These findings provided the basis for speculations regarding the evolution of IncA/C2 plasmids with In416-like integrons, and confirmed the rapid evolution of some IncA/C2 plasmid lineages. Considering the broad host range of IncA/C2 molecules, it seems that pKP-Gr642, pKP-Gr8143 and pEcl-Gr4873 plasmids might support the diffusion of In416-like integrons among Enterobacteriaceae.
- MeSH
- beta-laktamasy genetika MeSH
- Enterobacter cloacae enzymologie genetika izolace a purifikace MeSH
- enterobakteriální infekce mikrobiologie MeSH
- integrony * MeSH
- Klebsiella pneumoniae enzymologie genetika izolace a purifikace MeSH
- lidé MeSH
- molekulární sekvence - údaje MeSH
- plazmidy * MeSH
- pořadí genů MeSH
- sekvenční analýza DNA MeSH
- sekvenční homologie MeSH
- Check Tag
- lidé MeSH
- Publikační typ
- časopisecké články MeSH
- práce podpořená grantem MeSH
- Geografické názvy
- Řecko MeSH
We aimed at Escherichia coli and Enterobacter cloacae isolates resistant to cephalosporins and fluoroquinolones and Salmonella isolates in wild birds in Arctic Svalbard, Norway. Cloacal swabs of little auks (Alle alle, n=215) and samples of faeces of glaucous gulls (Larus hyperboreus, n=15) were examined. Inducible production of AmpC enzyme was detected in E. cloacae KW218 isolate. Sequence analysis of the 1146 bp PCR product of the ampC gene from this isolate revealed 99% sequence homology with the blaACT-14 and blaACT-5 AmpC beta-lactamase genes. Four, respectively six of the identified single nucleotide polymorphisms generated amino acid substitutions in the amino acid chain. As the ampC sequence polymorphism in the investigated E. cloacae strain was identified as unique, we revealed a novel variant of the ampC beta-lactamase gene blaACT-23.
- MeSH
- bakteriální léková rezistence genetika MeSH
- bakteriální proteiny genetika metabolismus MeSH
- beta-laktamasy genetika metabolismus MeSH
- Charadriiformes mikrobiologie MeSH
- DNA primery genetika MeSH
- Enterobacter cloacae enzymologie genetika MeSH
- Escherichia coli genetika MeSH
- jednonukleotidový polymorfismus genetika MeSH
- kloaka mikrobiologie MeSH
- molekulární sekvence - údaje MeSH
- polymerázová řetězová reakce veterinární MeSH
- sekvence nukleotidů MeSH
- sekvenční analýza DNA veterinární MeSH
- substituce aminokyselin genetika MeSH
- zvířata MeSH
- Check Tag
- zvířata MeSH
- Publikační typ
- časopisecké články MeSH
- práce podpořená grantem MeSH
- Geografické názvy
- Norsko MeSH
- Svalbard MeSH
- MeSH
- antibakteriální látky farmakologie MeSH
- beta-laktamasy genetika sekrece MeSH
- DNA bakterií chemie genetika MeSH
- Enterobacter cloacae účinky léků enzymologie genetika izolace a purifikace MeSH
- enterobakteriální infekce mikrobiologie MeSH
- hospitalizace MeSH
- lidé středního věku MeSH
- lidé MeSH
- mikrobiální testy citlivosti MeSH
- polymerázová řetězová reakce MeSH
- sekvenční analýza DNA MeSH
- Check Tag
- lidé středního věku MeSH
- lidé MeSH
- ženské pohlaví MeSH
- Publikační typ
- časopisecké články MeSH
- kazuistiky MeSH
- práce podpořená grantem MeSH
- Geografické názvy
- Česká republika MeSH
- Srí Lanka MeSH
