1887

Abstract

We previously found the class C .I2 group II (GII) intron in SCH909 inserted into the variable region of a class 1 integron within the site of the gene cassette. Here, we demonstrate that this  : : I2 gene cassette is a recombinationally active element despite the presence of the .I2 intron. In addition, .I2 is an active GII intron capable of performing self-splicing and invading specific target sites. Intron homing to a DNA target site is RecA-independent and recognizes the intron binding site (IBS)1 and IBS3 regions, formed by the 5′ TTGTT 3′ consensus sequence located within the inverse core site of integrons. Our results also indicate that the process for .I2 intron mobilization involves a secondary structure provided by the folding of the complete site. Moreover, phylogenetic analysis of the class C GII introns showed a clear divergent clade formed by introns that insert within specific sites usually associated with lateral gene transfer.

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2008-05-01
2020-05-28
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