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Efficient transposition of IS911 circles in vitro
B Ton-Hoang1, P Polard, M Chandler
1Laboratoire de Microbiologie et Génétique Moléculaire du CNRS, Toulouse, France.
The EMBO Journal
|March 28, 1998
Summary
Bacterial transposon circles from IS911 efficiently integrate into DNA targets using two key proteins, OrfA and the transposase OrfAB. This study reveals transposon circles as transposition intermediates and highlights protein collaboration.
Area of Science:
- Molecular Biology
- Genetics
- Microbiology
Background:
- The bacterial insertion sequence IS911 utilizes a unique transposition mechanism.
- Understanding the roles of IS911-encoded proteins is crucial for elucidating transposition pathways.
Purpose of the Study:
- To investigate the in vitro transposition activity of IS911 transposon circles.
- To determine the roles of OrfA and OrfAB proteins in IS911 transposition.
- To identify transposition intermediates and products.
Main Methods:
- Development of an in vitro system for IS911 transposon circle integration.
- Purification of IS911-encoded proteins OrfA and OrfAB.
- Analysis of intermolecular and intramolecular transposition products.
Main Results:
- Integration requires both OrfA and the transposase OrfAB.
- Transposon circles can act as transposition intermediates.
- Both two-ended and single-ended integration products were observed, influenced by transposon end spacing.
- Intramolecular products like deletions and inversions were generated.
Conclusions:
- Transposon circles are functional intermediates in IS911 transposition.
- OrfA and OrfAB proteins collaborate to facilitate transposition.
- Supercoiling of the donor molecule is not essential for integration.