title: Identification and cloning of a plasmid-encoded erythromycin resistance determinant from Lactobacillus reuteri.
abstract: Plasmid analysis, plasmid curing, cloning, and hybridization experiments were used to study four Lactobacillus reuteri strains showing high resistance to erythromycin. Plasmid curing with acriflavine resulted in a loss of erythromycin resistance in a frequency of 1-10%. For three of the strains this was accompanied by a loss of a 6.9-MDa plasmid, which was shown to be identical for the different strains and designated pLUL631. The erythromycin (erm) gene was located on a 5.5-MDa plasmid in the fourth strain. A restriction map of pLUL631 was constructed and the location of the erm gene on the plasmid was identified by cloning in Escherichia coli. By using a Streptococcus lactis-E. coli shuttle vector, the erm gene was also transformed to S. lactis and expressed. The erm gene from L. reuteri was shown to be related to the erm gene from pIP501 (Streptococcus agalactiae) by DNA-DNA hybridization.
authors.affiliation: Department of Microbiology, Swedish University of Agricultural Sciences, Uppsala.
authors.forename: L T
authors.initials: LT
authors.lastname: Axelsson
authors.forename: S E
authors.initials: SE
authors.lastname: Ahrné
authors.forename: M C
authors.initials: MC
authors.lastname: Andersson
authors.forename: S R
authors.initials: SR
authors.lastname: Ståhl
mesh_terms: D003001:Cloning, Molecular; D004352:Drug Resistance, Microbial / Q000235:genetics; D004917:Erythromycin / Q000494:pharmacology*; D007778:Lactobacillus / Q000187:drug effects / Q000235:genetics*; D009693:Nucleic Acid Hybridization; D011815:R Factors; D015183:Restriction Mapping
chemical_list: D004917:Erythromycin