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Caulobacter crescentus is a bacterium with a distinctive life cycle and so it is studied as a cell development model. In addition, we have adapted this bacterium for recombinant protein production and display based on the crystalline surface protein (S)-layer and its C-terminal secretion signal. We report here the development of small, high-copy-number plasmid vectors and methods for producing an...
To analyse the significance of conjugative broad-host-range IncP-1α plasmids for the spread of antibiotic resistance determinants in waste-water treatment plants we isolated and characterised five different IncP-1α plasmids from bacteria of activated sludge and the final effluents of a municipal waste-water treatment plant. These plasmids mediate resistance to ampicillin, cefaclor, cefuroxime, gentamicin,...
The IncP-1β plasmid pB8, which confers resistance to amoxicillin, spectinomycin, streptomycin, and sulfonamides, was previously isolated from a sewage treatment plant. It was found to possess abnormal conjugative transfer properties, i.e., transfer to Escherichia coli by conjugation or electroporation could not be detected. We showed in this study that plasmid pB8 is transferable to E. coli by conjugation,...
pDB2011, a multidrug resistance plasmid isolated from the foodborne Listeria innocua strain TTS-2011 was sequenced and characterized. Sequence analysis revealed that pDB2011 had a length of 7641bp and contained seven coding DNA sequences of which two were annotated as replication proteins, one as a recombination/mobilization protein and one as a transposase. Furthermore, pDB2011 harbored the trimethoprim,...
The goal of this study was to determine and compare the complete genome sequences of three new broad-host-range conjugative plasmids. Plasmids pMLUA1, pMLUA3 and pMLUA4 were previously recovered from estuarine water by exogenous plasmid isolation and ranged in size from ∼55 to 59kb. Comparative genomics showed that their backbone region was identical to the prototype pKJK5 and other IncP1-ε plasmids...
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