Abstract
The nucleotide sequence and genetic analyses of one of the directly repeated sequences flanking the macrolide-lincosamide-streptogramin B drug resistance determinant, ermF, from the Bacteroides fragilis R plasmid, pBF4, suggested that this region is an insertion sequence (IS) element. This 1,155-base-pair element contained partially matched (20 of 25 base pairs) terminal-inverted repeats, overlapping, anti-parallel open reading frames, and nine promoterlike sequences, including three that were oriented outward. Analysis of this sequence revealed no significant nucleotide homology to 13 other known IS elements. Inasmuch as Southern blot hybridization analysis detected homologous sequences in chromosomal DNA and its G+C content (42 mol%) was similar to that of B. fragilis, the data suggested that this element is of Bacteroides origin. Transposition promoted by this element was demonstrated in recA E. coli. Recombinants were recovered by selecting for the activation of a promoterless chloramphenicol resistance gene on the plasmid pDH5110 and were characterized by restriction endonuclease mapping and Southern blot hybridization. We propose that this IS element be designated IS4351.
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