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. 1990 Dec;172(12):6689–6696. doi: 10.1128/jb.172.12.6689-6696.1990

Structural and genetic organization of IS232, a new insertion sequence of Bacillus thuringiensis.

G Menou 1, J Mahillon 1, M M Lecadet 1, D Lereclus 1
PMCID: PMC210781  PMID: 2174857

Abstract

In the Bacillus thuringiensis strains toxic for the lepidopteran larvae, the delta-endotoxin genes cryIA are frequently found within a composite transposonlike structure flanked by two inverted repeat sequences. We report that these elements are true insertion sequences and designate them IS232. IS232 is a 2,184-bp element and is delimited by two imperfect inverted repeats (28 of 37 bp are identical). Two adjacent open reading frames, overlapping for three codons, span almost the entire sequence of IS232. The potential encoded polypeptides of 50 and 30-kDa are homologous to the IstA and IstB proteins of the gram-negative insertion sequence IS21. The N-terminal part of the 50-kDa polypeptide contains a helix-turn-helix DNA-binding motif. The junctions at the insertion sites of three IS232 elements were analyzed. Each case was different, with 0, 4, or 6 bp of the target DNA being duplicated. Transposition of IS232 in Escherichia coli was demonstrated by using a genetic marker inserted upstream of the two open reading frames.

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Selected References

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