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Isolation, characterization and transposition of an (IS2)2 intermediate
I Szeverényi1, T Bodoky, F Olasz
1Institute for Molecular Genetics, Agricultural Biotechnology Center Gödöllö, Hungary.
Molecular & General Genetics : MGG
|June 12, 1996
Summary
Researchers identified a new dimer derivative of Escherichia coli insertion sequence IS2, termed (IS2)2. This active transposition intermediate exhibits significantly higher transposition frequency than the monomer IS2.
Area of Science:
- Molecular Biology
- Genetics
- Microbiology
Background:
- The insertion sequence IS2 from Escherichia coli is a well-studied mobile genetic element.
- Understanding the mechanisms of transposition is crucial for comprehending genome dynamics and evolution.
Purpose of the Study:
- To isolate and characterize a dimer derivative of the IS2 element.
- To investigate the transposition properties and mechanism of the (IS2)2 dimer.
Main Methods:
- Isolation and characterization of the (IS2)2 dimer structure.
- Analysis of transposition junctions in target sequences.
- Comparison of transposition frequencies between (IS2)2 and monomer IS2.
Main Results:
- The (IS2)2 dimer consists of two IS2 elements in direct repeat, separated by 1 bp.
- Transposition of (IS2)2 into a target plasmid generated cointegrate structures.
- The (IS2)2 dimer demonstrated significantly higher transposition frequency compared to the monomer IS2.
- The (IS2)2 dimer exhibits poor stability and high transposition activity.
Conclusions:
- The (IS2)2 dimer represents an active transposition intermediate.
- Its transposition mode is analogous to the joined dimer model observed in other insertion sequences like IS21 and IS30.
- This finding provides new insights into the transposition mechanisms of IS elements.