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Gene conversion in transposition of Escherichia coli element IS30.

Abstract：

:The mobile element IS30 has dual target specificity, since it can integrate adjacent to the inverted repeat (IR) of another IS30 copy or into hot-spot sequences characterized by a well-defined consensus showing no similarity to the ends of the element. The result of such integrations into these targets is different, as gene conversion events take place frequently during insertion next to an IR end, while this phenomenon has never been observed in targeting hot-spot sequences. Conversion events in IR-targeting cannot be explained exclusively by the activity of the transposase, but suggest the involvement of the homologous recombination and repair machinery of the host cell. Here, we show that the homology between the donor and target sequences is required for conversion and the starting point of the process is the site of integration. The frequency of conversion depends on the distance of mutations from the end of the targeted element. Remarkable bias is found in the role of donor and target DNA, since generally the donor sequence is converted depending on the target. Conversion was shown to occur also without formation of transposition products. All these data are consistent with the idea of the establishment, migration and resolution of a Holliday-like cruciform structure, which can be responsible for conversion events. To explain the variety of conversion products in IR-targeting, a molecular model has been proposed and discussed.

journal_name

J Mol Biol

journal_title

Journal of molecular biology

authors

Olasz F,Fischer T,Szabó M,Nagy Z,Kiss J

doi

10.1016/j.jmb.2003.10.011

keywords:

subject

Has Abstract

pub_date

2003-12-12 00:00:00

pages

967-78

issue

5

eissn

0022-2836

issn

1089-8638

pii

S0022283603012622

journal_volume

334

pub_type

杂志文章

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