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. 2022 Jul 22;13:945411. doi: 10.3389/fmicb.2022.945411

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Copyright © 2022 Johannessen, Anthonisen, Zecic, Hegstad, Ranheim and Skaare.

This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) and the copyright owner(s) are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.

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Schematic presentation of the transposable element Tn7470, representing 7.3% of Tn7100. Refer to Figure 1 for location on Tn7100. Tn7470 consists of a 5,380-bp insertion in the topB gene encoding DNA topoisomerase III (light green) (QEA08733), with the insertion site consisting of 6-bp inverted repeats (bold). Tn7470 carries the aminoglycoside resistance genes aph(2″)-Ib and aac(6′)-Im (red arrows) and encodes a recombinase (rec) and a TnpW family transposase (tnp) and three hypothetical proteins (h) (green arrows). Tn7470 shares 99.96% identity with an insertion in topB in plasmid p49969 (CP070545) from Citrobacter freundii strain CF49969 but differs from p49969 by lacking a 1,319-bp fragment encoding a MobA/MobL family protein (mob). The location of Tn7470 in topB is similar to p49969 but the target sequences differ by one nucleotide (red text).