The gene ere(A) of the plasmid pIP1100 is larger than originally reported and is organized as an integron gene cassette. The ere(A) gene cassette carries its own promoter and is propagated by a class 2 integron with an insertion sequence element, IS1, inserted upstream of the intI2 gene. The mobility of the ere(A) cassette has been demonstrated.
Unité de Programmation Moléculaire et Toxicologie Génétique, CNRS URA 1444, Département de Microbiologie Fondamentale et Médicale, Institut Pasteur, 75724, Paris, France.
