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• W2097633719 abstract "Integrons are genetic elements able to integrate and disseminate genes as cassettes by a site-specific recombination mechanism. These elements contain a gene coding for an integrase that carries out recombination by interacting with two different target sites; the attI site in cis with the integrase and the palindromic attC site of a gene cassette. Integron integrases (IntIs) bind specifically to the bottom strand of attC sites. The extrahelical bases resulting from folding of attC bottom strands are important for the recognition by integrases. These enzymes are directly involved in the accumulation and formation of new cassette arrangements in the variable region of integrons. Thus, it is important to better understand interactions between IntIs and their substrates.We compared the ability of five IntIs to carry out excision of several cassettes flanked by different attC sites. The results showed that for most cassettes, IntI1 was the most active integrase. However, IntI2*179E and SonIntIA could easily excise cassettes containing the attCdfrA1 site located upstream, whereas IntI1 and IntI3 had only a weak excision activity for these cassettes. Analysis of the secondary structure adopted by the bottom strand of attCdfrA1 has shown that the identity of the extrahelical bases and the distance between them (A-N7-8-C) differ from those of attCs contained in the cassettes most easily excisable by IntI1 (T-N6-G). We used the attCdfrA1 site upstream of the sat2 gene cassette as a template and varied the identity and spacing between the extrahelical bases in order to determine how these modifications influence the ability of IntI1, IntI2*179E, IntI3 and SonIntIA to excise cassettes. Our results show that IntI1 is more efficient in cassette excision using T-N6-G or T-N6-C attCs while IntI3 recognizes only a limited range of attCs. IntI2*179E and SonIntIA are more tolerant of changes to the identity and spacing of extrahelical bases.This study provides new insights into the factors that influence the efficiency of cassette excision by integron integrases. It also suggests that IntI2 and SonIntIA have an evolutionary path that is different from IntI1 and IntI3, in their ability to recognize and excise cassettes." @default.
• W2097633719 created "2016-06-24" @default.
• W2097633719 creator A5003456043 @default.
• W2097633719 creator A5050667345 @default.
• W2097633719 date "2011-01-01" @default.
• W2097633719 modified "2023-10-14" @default.
• W2097633719 title "Effect of attC structure on cassette excision by integron integrases" @default.
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• W2097633719 doi "https://doi.org/10.1186/1759-8753-2-3" @default.
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