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Lactobacillus fermentumis a lactic acid bacterial species commonly found in the digestive tracts of pigs and rodents and also present in man. We characterized a 5.7-kb plasmid, pLEM3, conferring erythromycin resistance, which was isolated from a porcine strain ofL. fermentum.Plasmid pLEM3 established efficiently inL. fermentum,conferred high-level erythromycin resistance (MIC > 1 mg/ml), and was...
The ampicillin resistance gene fromShigella flexneri2a strain YSH6000 was cloned and shown by Southern hybridization analysis to be closely linked to the previously cloned streptomycin, chloramphenicol, and tetracycline resistance determinants, which are borne on a chromosomally integrated 99-kb element. Analysis of this chromosomal multi-antibiotic resistance locus revealed that it had a high level...
A 6.5-kb fragment of plasmid DNA fromBacillus thuringiensis(Bt) ssp.fukuokaensisthat encodes a 24-kDa crystalline component was analyzed to identify additional open reading frames (orfs). A novel Bt IS240-like element was found upstream of this gene and is considered to be a vestige of a once active insertion sequence due to a stop codon that interrupts the long orf encoding the putative transposase...
The species type strain ofPseudomonas alcaligenescontains three small cryptic plasmids (designated pECB1, 2, and 3) of 7740, 4480, and 2700 bp, respectively. Partial restriction enzyme maps have been constructed for pECB1 and 2 which on this basis do not appear to be related. pECB3 proved refractile to cutting with commonly used restriction enzymes, though it was completely rendered by those enzymes...
pKM101 is a self-transmissible plasmid of the IncN incompatibility group. Analysis of the DNA sequences of the genes required for conjugal transfer suggested the existence of a previously uncharacterized open reading frame, designatedtraM,that might be required for conjugation. Merodiploid strains containing transposon insertion mutations either intraMor in neighboringtragenes were used to demonstrate...
Sphingomonassp. CFO6 (a member of the alpha group ofProteobacteria) was isolated from a Washington soil by enrichment on the insecticide carbofuran as a sole source of carbon and energy. This strain has been shown to harbor five plasmids, at least some of which are required for catabolism of carbofuran. Rearrangements, deletions, and loss of individual plasmids resulting in the loss of the carbofuran-degrading...
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