Terminal Inverted Repeats of Insertion Sequence IS30 Serve As Targets for Transposition

Overview

Journal J Bacteriol

Publisher American Society for Microbiology

Specialty Microbiology

Date 1997 Dec 11

PMID 9393723

Citations 17

Authors

F Olasz

T Farkas

J Kiss

A Arini

W Arber

Affiliations

Soon will be listed here.

Abstract

In the present study, we demonstrate that the terminal inverted repeats of the Escherichia coli insertion sequence IS30 are functional target sites for the transposition of the (IS30)2 dimer, which represents an intermediate structure in the transposition of IS30. Comparative analysis of various target regions revealed that the left and right ends differ in their "attractivity." In our experiments, the joined left and right ends, i.e., the (IS30)2 intermediate structure, was found to be the most preferred target. It was also shown that flanking sequences can influence the target activity of the terminal repeats. The functional part of the target region was localized in the inverted repeats by means of mutational analysis, and it corresponds to the binding site of IS30 transposase. Insertion of 1 bp into the right inverted repeat resulted in unusual target duplication accompanied by gene conversion. The choice of the terminal inverted repeats as targets in transposition leads to the reconstruction of the (IS30)2 structure, which may induce a cascade of further rearrangements. Therefore, this process can play a role in the evolution of the genome.

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