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. 1985 Feb;161(2):727–735. doi: 10.1128/jb.161.2.727-735.1985

Aerobactin genes in clinical isolates of Escherichia coli.

A Bindereif, J B Neilands
PMCID: PMC214943  PMID: 3881407

Abstract

The location of the aerobactin gene complex on either the chromosome or plasmid was determined in eight aerobactin-positive clinical isolates of Escherichia coli by Southern hybridization analysis, using as probes the cloned aerobactin genes from the ColV-K30 plasmid. The aerobactin genes were in two cases detected on large plasmids, whereas in the other strains the aerobactin genes are most likely located on the chromosome. Restriction mapping revealed only slight variations in the structural genes and an at least 3.4-kilobase-long upstream region conserved in all three plasmid-coded systems. A 7.7-kilobase HindIII fragment upstream and adjacent to the 16.3-kilobase HindIII fragment carrying the complete aerobactin system was cloned from the ColV-K30 plasmid. Fine-structure restriction mapping identified the left insertion sequence in the upstream region as IS1, in inverted orientation to the IS1 element downstream from the aerobactin operon. The upstream and downstream sequences of IS1 appear to have perfect homology, as indicated by S1 nuclease resistance of a 760-base-pair DNA duplex formed by both IS1 elements.

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