1. Capture of armA by a novel ISCR element, ISCR28.
- Author
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Yuan M, Nie L, Huang Z, Xu S, Qiu X, Han L, Kang Y, Li F, Yao J, Li Q, Li H, Li D, Zhu X, and Li Z
- Subjects
- Open Reading Frames genetics, Plasmids genetics, Gram-Negative Bacteria genetics, DNA, Bacterial genetics, Mutagenesis, Insertional, DNA Transposable Elements genetics, Transposases genetics
- Abstract
ISCR28 is a fully functional and active member of the IS91-like family of insertion sequences. ISCR28 is 1,708-bp long and contains a 1,293-bp long putative open reading frame that codes a transposase. Sixty ISCR28-containing sequences from GenBank generated 27 non-repeat genetic contexts, all of which represented naturally occurring biological events that had occurred in a wide range of gram-negative organisms. Insertion of ISCR28 into target DNA preferred the presence of a 5'-GXXT-3' sequence at its terIS (replication terminator) end. Loss of the first 4 bp of its oriIS (origin of replication) likely caused ISCR28 to be trapped in ISApl1-based transposons or similar structures. Loss of terIS and fusion with a mobile element upstream likely promoted co-transfer of ISCR28 and the downstream resistance genes. ArmA and its downstream intact ISCR28 can be excised from recombinant pKD46 plasmids forming circular intermediates, further elucidating its activity as a transposase., (Copyright © 2024 The Authors. Published by Elsevier Ltd.. All rights reserved.)
- Published
- 2024
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